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Annotation of mandoc/roff.c, Revision 1.218

1.218   ! schwarze    1: /*     $Id: roff.c,v 1.217 2014/07/04 16:12:08 schwarze Exp $ */
1.1       kristaps    2: /*
1.175     schwarze    3:  * Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
1.190     schwarze    4:  * Copyright (c) 2010-2014 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
1.66      kristaps    7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps    9:  *
1.106     kristaps   10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
1.66      kristaps   11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1.106     kristaps   12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
1.66      kristaps   13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   17:  */
1.66      kristaps   18: #ifdef HAVE_CONFIG_H
                     19: #include "config.h"
                     20: #endif
1.30      kristaps   21:
1.67      kristaps   22: #include <assert.h>
1.85      kristaps   23: #include <ctype.h>
1.178     schwarze   24: #include <stdio.h>
1.1       kristaps   25: #include <stdlib.h>
1.67      kristaps   26: #include <string.h>
1.1       kristaps   27:
1.67      kristaps   28: #include "mandoc.h"
1.201     schwarze   29: #include "mandoc_aux.h"
1.109     kristaps   30: #include "libroff.h"
1.94      kristaps   31: #include "libmandoc.h"
1.33      kristaps   32:
1.141     kristaps   33: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   34: #define        RSTACK_MAX      128
                     35:
1.170     schwarze   36: /* Maximum number of string expansions per line, to break infinite loops. */
                     37: #define        EXPAND_LIMIT    1000
                     38:
1.67      kristaps   39: enum   rofft {
1.103     kristaps   40:        ROFF_ad,
1.80      kristaps   41:        ROFF_am,
                     42:        ROFF_ami,
                     43:        ROFF_am1,
1.193     schwarze   44:        ROFF_as,
1.174     kristaps   45:        ROFF_cc,
1.194     schwarze   46:        ROFF_ce,
1.80      kristaps   47:        ROFF_de,
                     48:        ROFF_dei,
                     49:        ROFF_de1,
1.83      schwarze   50:        ROFF_ds,
1.82      kristaps   51:        ROFF_el,
1.185     schwarze   52:        ROFF_fam,
1.186     schwarze   53:        ROFF_hw,
1.103     kristaps   54:        ROFF_hy,
1.82      kristaps   55:        ROFF_ie,
1.75      kristaps   56:        ROFF_if,
1.76      kristaps   57:        ROFF_ig,
1.123     schwarze   58:        ROFF_it,
1.103     kristaps   59:        ROFF_ne,
                     60:        ROFF_nh,
1.104     kristaps   61:        ROFF_nr,
1.124     schwarze   62:        ROFF_ns,
                     63:        ROFF_ps,
1.83      schwarze   64:        ROFF_rm,
1.203     schwarze   65:        ROFF_rr,
1.105     kristaps   66:        ROFF_so,
1.124     schwarze   67:        ROFF_ta,
1.83      schwarze   68:        ROFF_tr,
1.175     schwarze   69:        ROFF_Dd,
                     70:        ROFF_TH,
1.109     kristaps   71:        ROFF_TS,
                     72:        ROFF_TE,
1.112     kristaps   73:        ROFF_T_,
1.125     kristaps   74:        ROFF_EQ,
                     75:        ROFF_EN,
1.76      kristaps   76:        ROFF_cblock,
1.106     kristaps   77:        ROFF_USERDEF,
1.67      kristaps   78:        ROFF_MAX
                     79: };
                     80:
1.147     kristaps   81: /*
1.167     kristaps   82:  * An incredibly-simple string buffer.
                     83:  */
1.94      kristaps   84: struct roffstr {
1.167     kristaps   85:        char            *p; /* nil-terminated buffer */
                     86:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   87: };
                     88:
                     89: /*
1.167     kristaps   90:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps   91:  */
                     92: struct roffkv {
                     93:        struct roffstr   key;
                     94:        struct roffstr   val;
                     95:        struct roffkv   *next; /* next in list */
1.94      kristaps   96: };
                     97:
1.180     schwarze   98: /*
                     99:  * A single number register as part of a singly-linked list.
                    100:  */
                    101: struct roffreg {
                    102:        struct roffstr   key;
1.181     schwarze  103:        int              val;
1.180     schwarze  104:        struct roffreg  *next;
                    105: };
                    106:
1.67      kristaps  107: struct roff {
1.128     kristaps  108:        struct mparse   *parse; /* parse point */
1.199     schwarze  109:        int              options; /* parse options */
1.67      kristaps  110:        struct roffnode *last; /* leaf of stack */
1.198     schwarze  111:        int              rstack[RSTACK_MAX]; /* stack of !`ie' rules */
1.174     kristaps  112:        char             control; /* control character */
1.82      kristaps  113:        int              rstackpos; /* position in rstack */
1.180     schwarze  114:        struct roffreg  *regtab; /* number registers */
1.166     kristaps  115:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  116:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    117:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  118:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  119:        struct tbl_node *first_tbl; /* first table parsed */
                    120:        struct tbl_node *last_tbl; /* last table parsed */
                    121:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  122:        struct eqn_node *last_eqn; /* last equation parsed */
                    123:        struct eqn_node *first_eqn; /* first equation parsed */
                    124:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps  125: };
                    126:
1.67      kristaps  127: struct roffnode {
                    128:        enum rofft       tok; /* type of node */
                    129:        struct roffnode *parent; /* up one in stack */
                    130:        int              line; /* parse line */
                    131:        int              col; /* parse col */
1.106     kristaps  132:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  133:        char            *end; /* end-rules: custom token */
                    134:        int              endspan; /* end-rules: next-line or infty */
1.198     schwarze  135:        int              rule; /* current evaluation rule */
1.67      kristaps  136: };
                    137:
                    138: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  139:                         enum rofft tok, /* tok of macro */ \
1.207     schwarze  140:                         char **bufp, /* input buffer */ \
1.67      kristaps  141:                         size_t *szp, /* size of input buffer */ \
                    142:                         int ln, /* parse line */ \
1.75      kristaps  143:                         int ppos, /* original pos in buffer */ \
                    144:                         int pos, /* current pos in buffer */ \
1.74      kristaps  145:                         int *offs /* reset offset of buffer data */
1.67      kristaps  146:
                    147: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    148:
                    149: struct roffmac {
                    150:        const char      *name; /* macro name */
1.79      kristaps  151:        roffproc         proc; /* process new macro */
                    152:        roffproc         text; /* process as child text of macro */
                    153:        roffproc         sub; /* process as child of macro */
                    154:        int              flags;
                    155: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  156:        struct roffmac  *next;
1.67      kristaps  157: };
                    158:
1.141     kristaps  159: struct predef {
                    160:        const char      *name; /* predefined input name */
                    161:        const char      *str; /* replacement symbol */
                    162: };
                    163:
                    164: #define        PREDEF(__name, __str) \
                    165:        { (__name), (__str) },
                    166:
1.155     kristaps  167: static enum rofft       roffhash_find(const char *, size_t);
                    168: static void             roffhash_init(void);
                    169: static void             roffnode_cleanscope(struct roff *);
                    170: static void             roffnode_pop(struct roff *);
                    171: static void             roffnode_push(struct roff *, enum rofft,
                    172:                                const char *, int, int);
1.80      kristaps  173: static enum rofferr     roff_block(ROFF_ARGS);
                    174: static enum rofferr     roff_block_text(ROFF_ARGS);
                    175: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    176: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  177: static enum rofferr     roff_cc(ROFF_ARGS);
1.195     schwarze  178: static void             roff_ccond(struct roff *, int, int);
1.82      kristaps  179: static enum rofferr     roff_cond(ROFF_ARGS);
                    180: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    181: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  182: static enum rofferr     roff_ds(ROFF_ARGS);
1.198     schwarze  183: static int              roff_evalcond(const char *, int *);
1.204     schwarze  184: static int              roff_evalnum(const char *, int *, int *, int);
                    185: static int              roff_evalpar(const char *, int *, int *);
1.198     schwarze  186: static int              roff_evalstrcond(const char *, int *);
1.155     kristaps  187: static void             roff_free1(struct roff *);
1.180     schwarze  188: static void             roff_freereg(struct roffreg *);
1.167     kristaps  189: static void             roff_freestr(struct roffkv *);
1.212     schwarze  190: static size_t           roff_getname(struct roff *, char **, int, int);
1.184     schwarze  191: static int              roff_getnum(const char *, int *, int *);
                    192: static int              roff_getop(const char *, int *, char *);
1.181     schwarze  193: static int              roff_getregn(const struct roff *,
                    194:                                const char *, size_t);
1.192     schwarze  195: static int              roff_getregro(const char *name);
1.207     schwarze  196: static const char      *roff_getstrn(const struct roff *,
1.94      kristaps  197:                                const char *, size_t);
1.178     schwarze  198: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  199: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  200: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  201: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  202:                                int, int, const char *);
1.214     schwarze  203: static enum rofft       roff_parse(struct roff *, char *, int *,
                    204:                                int, int);
1.178     schwarze  205: static enum rofferr     roff_parsetext(char **, size_t *, int, int *);
1.207     schwarze  206: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  207:                                char **, size_t *, int, int);
1.122     schwarze  208: static enum rofferr     roff_rm(ROFF_ARGS);
1.203     schwarze  209: static enum rofferr     roff_rr(ROFF_ARGS);
1.94      kristaps  210: static void             roff_setstr(struct roff *,
1.106     kristaps  211:                                const char *, const char *, int);
1.207     schwarze  212: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  213:                                size_t, const char *, size_t, int);
1.105     kristaps  214: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  215: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  216: static enum rofferr     roff_Dd(ROFF_ARGS);
                    217: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  218: static enum rofferr     roff_TE(ROFF_ARGS);
                    219: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  220: static enum rofferr     roff_EQ(ROFF_ARGS);
                    221: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  222: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  223: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  224:
1.155     kristaps  225: /* See roffhash_find() */
1.85      kristaps  226:
                    227: #define        ASCII_HI         126
                    228: #define        ASCII_LO         33
                    229: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    230:
                    231: static struct roffmac  *hash[HASHWIDTH];
                    232:
                    233: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  234:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  235:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    236:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    237:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.193     schwarze  238:        { "as", roff_ds, NULL, NULL, 0, NULL },
1.174     kristaps  239:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.194     schwarze  240:        { "ce", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  241:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    242:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    243:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  244:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  245:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  246:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  247:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  248:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  249:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    250:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    251:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  252:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  253:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    254:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  255:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  256:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    257:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  258:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.203     schwarze  259:        { "rr", roff_rr, NULL, NULL, 0, NULL },
1.105     kristaps  260:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  261:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  262:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  263:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    264:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  265:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    266:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  267:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  268:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    269:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  270:        { ".", roff_cblock, NULL, NULL, 0, NULL },
1.106     kristaps  271:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  272: };
                    273:
1.200     schwarze  274: /* not currently implemented: Ds em Eq LP Me PP pp Or Rd Sf SH */
1.175     schwarze  275: const  char *const __mdoc_reserved[] = {
                    276:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    277:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    278:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    279:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
1.200     schwarze  280:        "Dt", "Dv", "Dx", "D1",
                    281:        "Ec", "Ed", "Ef", "Ek", "El", "Em",
                    282:        "En", "Eo", "Er", "Es", "Ev", "Ex",
1.175     schwarze  283:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
1.200     schwarze  284:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp",
                    285:        "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
1.175     schwarze  286:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
1.200     schwarze  287:        "Pa", "Pc", "Pf", "Po", "Pp", "Pq",
                    288:        "Qc", "Ql", "Qo", "Qq", "Re", "Rs", "Rv",
                    289:        "Sc", "Sh", "Sm", "So", "Sq",
1.175     schwarze  290:        "Ss", "St", "Sx", "Sy",
                    291:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
1.200     schwarze  292:        "%A", "%B", "%C", "%D", "%I", "%J", "%N", "%O",
1.175     schwarze  293:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    294:        NULL
                    295: };
                    296:
1.200     schwarze  297: /* not currently implemented: BT DE DS ME MT PT SY TQ YS */
1.175     schwarze  298: const  char *const __man_reserved[] = {
1.200     schwarze  299:        "AT", "B", "BI", "BR", "DT",
                    300:        "EE", "EN", "EQ", "EX", "HP", "I", "IB", "IP", "IR",
                    301:        "LP", "OP", "P", "PD", "PP",
                    302:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS",
                    303:        "TE", "TH", "TP", "TS", "T&", "UC", "UE", "UR",
1.175     schwarze  304:        NULL
                    305: };
                    306:
1.141     kristaps  307: /* Array of injected predefined strings. */
                    308: #define        PREDEFS_MAX      38
                    309: static const struct predef predefs[PREDEFS_MAX] = {
                    310: #include "predefs.in"
                    311: };
                    312:
1.155     kristaps  313: /* See roffhash_find() */
1.85      kristaps  314: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    315:
1.178     schwarze  316: static int      roffit_lines;  /* number of lines to delay */
                    317: static char    *roffit_macro;  /* nil-terminated macro line */
                    318:
1.207     schwarze  319:
1.85      kristaps  320: static void
1.155     kristaps  321: roffhash_init(void)
1.85      kristaps  322: {
                    323:        struct roffmac   *n;
                    324:        int               buc, i;
                    325:
1.106     kristaps  326:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  327:                assert(roffs[i].name[0] >= ASCII_LO);
                    328:                assert(roffs[i].name[0] <= ASCII_HI);
                    329:
                    330:                buc = ROFF_HASH(roffs[i].name);
                    331:
                    332:                if (NULL != (n = hash[buc])) {
                    333:                        for ( ; n->next; n = n->next)
                    334:                                /* Do nothing. */ ;
                    335:                        n->next = &roffs[i];
                    336:                } else
                    337:                        hash[buc] = &roffs[i];
                    338:        }
                    339: }
                    340:
1.67      kristaps  341: /*
                    342:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    343:  * the nil-terminated string name could be found.
                    344:  */
                    345: static enum rofft
1.155     kristaps  346: roffhash_find(const char *p, size_t s)
1.67      kristaps  347: {
1.85      kristaps  348:        int              buc;
                    349:        struct roffmac  *n;
1.67      kristaps  350:
1.85      kristaps  351:        /*
                    352:         * libroff has an extremely simple hashtable, for the time
                    353:         * being, which simply keys on the first character, which must
                    354:         * be printable, then walks a chain.  It works well enough until
                    355:         * optimised.
                    356:         */
                    357:
                    358:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    359:                return(ROFF_MAX);
                    360:
                    361:        buc = ROFF_HASH(p);
                    362:
                    363:        if (NULL == (n = hash[buc]))
                    364:                return(ROFF_MAX);
                    365:        for ( ; n; n = n->next)
1.106     kristaps  366:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  367:                        return((enum rofft)(n - roffs));
1.67      kristaps  368:
                    369:        return(ROFF_MAX);
                    370: }
                    371:
                    372: /*
                    373:  * Pop the current node off of the stack of roff instructions currently
                    374:  * pending.
                    375:  */
                    376: static void
                    377: roffnode_pop(struct roff *r)
                    378: {
                    379:        struct roffnode *p;
                    380:
1.75      kristaps  381:        assert(r->last);
1.207     schwarze  382:        p = r->last;
1.82      kristaps  383:
1.75      kristaps  384:        r->last = r->last->parent;
1.106     kristaps  385:        free(p->name);
                    386:        free(p->end);
1.67      kristaps  387:        free(p);
                    388: }
                    389:
                    390: /*
                    391:  * Push a roff node onto the instruction stack.  This must later be
                    392:  * removed with roffnode_pop().
                    393:  */
1.98      schwarze  394: static void
1.106     kristaps  395: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    396:                int line, int col)
1.67      kristaps  397: {
                    398:        struct roffnode *p;
                    399:
1.98      schwarze  400:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  401:        p->tok = tok;
1.106     kristaps  402:        if (name)
                    403:                p->name = mandoc_strdup(name);
1.67      kristaps  404:        p->parent = r->last;
                    405:        p->line = line;
                    406:        p->col = col;
1.198     schwarze  407:        p->rule = p->parent ? p->parent->rule : 0;
1.67      kristaps  408:
                    409:        r->last = p;
                    410: }
                    411:
                    412: static void
                    413: roff_free1(struct roff *r)
                    414: {
1.176     schwarze  415:        struct tbl_node *tbl;
1.125     kristaps  416:        struct eqn_node *e;
1.167     kristaps  417:        int              i;
1.67      kristaps  418:
1.176     schwarze  419:        while (NULL != (tbl = r->first_tbl)) {
                    420:                r->first_tbl = tbl->next;
                    421:                tbl_free(tbl);
1.109     kristaps  422:        }
                    423:
1.113     kristaps  424:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    425:
1.125     kristaps  426:        while (NULL != (e = r->first_eqn)) {
                    427:                r->first_eqn = e->next;
                    428:                eqn_free(e);
                    429:        }
                    430:
                    431:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    432:
1.67      kristaps  433:        while (r->last)
                    434:                roffnode_pop(r);
1.109     kristaps  435:
1.167     kristaps  436:        roff_freestr(r->strtab);
                    437:        roff_freestr(r->xmbtab);
                    438:
                    439:        r->strtab = r->xmbtab = NULL;
                    440:
1.180     schwarze  441:        roff_freereg(r->regtab);
                    442:
                    443:        r->regtab = NULL;
                    444:
1.167     kristaps  445:        if (r->xtab)
                    446:                for (i = 0; i < 128; i++)
                    447:                        free(r->xtab[i].p);
                    448:
                    449:        free(r->xtab);
                    450:        r->xtab = NULL;
1.67      kristaps  451: }
                    452:
                    453: void
                    454: roff_reset(struct roff *r)
                    455: {
                    456:
                    457:        roff_free1(r);
1.174     kristaps  458:        r->control = 0;
1.67      kristaps  459: }
                    460:
                    461: void
                    462: roff_free(struct roff *r)
                    463: {
                    464:
                    465:        roff_free1(r);
                    466:        free(r);
                    467: }
                    468:
                    469: struct roff *
1.199     schwarze  470: roff_alloc(struct mparse *parse, int options)
1.67      kristaps  471: {
                    472:        struct roff     *r;
                    473:
1.98      schwarze  474:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  475:        r->parse = parse;
1.199     schwarze  476:        r->options = options;
1.82      kristaps  477:        r->rstackpos = -1;
1.207     schwarze  478:
1.155     kristaps  479:        roffhash_init();
1.141     kristaps  480:
1.67      kristaps  481:        return(r);
                    482: }
                    483:
1.94      kristaps  484: /*
1.206     schwarze  485:  * In the current line, expand escape sequences that tend to get
                    486:  * used in numerical expressions and conditional requests.
                    487:  * Also check the syntax of the remaining escape sequences.
1.154     kristaps  488:  */
1.172     schwarze  489: static enum rofferr
1.142     kristaps  490: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  491: {
1.208     schwarze  492:        char             ubuf[24]; /* buffer to print the number */
1.205     schwarze  493:        const char      *start; /* start of the string to process */
1.209     schwarze  494:        char            *stesc; /* start of an escape sequence ('\\') */
1.108     schwarze  495:        const char      *stnam; /* start of the name, after "[(*" */
                    496:        const char      *cp;    /* end of the name, e.g. before ']' */
                    497:        const char      *res;   /* the string to be substituted */
1.181     schwarze  498:        char            *nbuf;  /* new buffer to copy bufp to */
                    499:        size_t           maxl;  /* expected length of the escape name */
                    500:        size_t           naml;  /* actual length of the escape name */
                    501:        int              expand_count;  /* to avoid infinite loops */
1.206     schwarze  502:        int              npos;  /* position in numeric expression */
1.218   ! schwarze  503:        int              arg_complete; /* argument not interrupted by eol */
1.206     schwarze  504:        char             term;  /* character terminating the escape */
1.94      kristaps  505:
1.170     schwarze  506:        expand_count = 0;
1.205     schwarze  507:        start = *bufp + pos;
                    508:        stesc = strchr(start, '\0') - 1;
                    509:        while (stesc-- > start) {
1.170     schwarze  510:
1.205     schwarze  511:                /* Search backwards for the next backslash. */
                    512:
                    513:                if ('\\' != *stesc)
                    514:                        continue;
                    515:
                    516:                /* If it is escaped, skip it. */
                    517:
                    518:                for (cp = stesc - 1; cp >= start; cp--)
                    519:                        if ('\\' != *cp)
                    520:                                break;
                    521:
                    522:                if (0 == (stesc - cp) % 2) {
1.209     schwarze  523:                        stesc = (char *)cp;
1.205     schwarze  524:                        continue;
                    525:                }
1.108     schwarze  526:
1.206     schwarze  527:                /* Decide whether to expand or to check only. */
1.108     schwarze  528:
1.206     schwarze  529:                term = '\0';
1.205     schwarze  530:                cp = stesc + 1;
1.181     schwarze  531:                switch (*cp) {
1.207     schwarze  532:                case '*':
1.181     schwarze  533:                        res = NULL;
                    534:                        break;
1.207     schwarze  535:                case 'B':
1.206     schwarze  536:                        /* FALLTHROUGH */
1.207     schwarze  537:                case 'w':
1.206     schwarze  538:                        term = cp[1];
                    539:                        /* FALLTHROUGH */
1.207     schwarze  540:                case 'n':
1.181     schwarze  541:                        res = ubuf;
                    542:                        break;
                    543:                default:
1.205     schwarze  544:                        if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
                    545:                                mandoc_msg(MANDOCERR_BADESCAPE, r->parse,
                    546:                                    ln, (int)(stesc - *bufp), NULL);
                    547:                        continue;
1.152     kristaps  548:                }
                    549:
1.205     schwarze  550:                if (EXPAND_LIMIT < ++expand_count) {
                    551:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
                    552:                            ln, (int)(stesc - *bufp), NULL);
                    553:                        return(ROFF_IGN);
                    554:                }
1.108     schwarze  555:
                    556:                /*
                    557:                 * The third character decides the length
1.181     schwarze  558:                 * of the name of the string or register.
1.108     schwarze  559:                 * Save a pointer to the name.
                    560:                 */
                    561:
1.206     schwarze  562:                if ('\0' == term) {
                    563:                        switch (*++cp) {
1.207     schwarze  564:                        case '\0':
1.206     schwarze  565:                                maxl = 0;
                    566:                                break;
1.207     schwarze  567:                        case '(':
1.206     schwarze  568:                                cp++;
                    569:                                maxl = 2;
                    570:                                break;
1.207     schwarze  571:                        case '[':
1.206     schwarze  572:                                cp++;
                    573:                                term = ']';
                    574:                                maxl = 0;
                    575:                                break;
                    576:                        default:
                    577:                                maxl = 1;
                    578:                                break;
                    579:                        }
                    580:                } else {
                    581:                        cp += 2;
1.94      kristaps  582:                        maxl = 0;
                    583:                }
1.108     schwarze  584:                stnam = cp;
1.94      kristaps  585:
1.108     schwarze  586:                /* Advance to the end of the name. */
1.94      kristaps  587:
1.218   ! schwarze  588:                arg_complete = 1;
1.181     schwarze  589:                for (naml = 0; 0 == maxl || naml < maxl; naml++, cp++) {
1.153     kristaps  590:                        if ('\0' == *cp) {
1.207     schwarze  591:                                mandoc_msg(MANDOCERR_BADESCAPE, r->parse,
                    592:                                    ln, (int)(stesc - *bufp), NULL);
1.218   ! schwarze  593:                                arg_complete = 0;
1.206     schwarze  594:                                break;
1.153     kristaps  595:                        }
1.206     schwarze  596:                        if (0 == maxl && *cp == term) {
                    597:                                cp++;
1.94      kristaps  598:                                break;
1.206     schwarze  599:                        }
1.94      kristaps  600:                }
                    601:
1.108     schwarze  602:                /*
                    603:                 * Retrieve the replacement string; if it is
                    604:                 * undefined, resume searching for escapes.
                    605:                 */
                    606:
1.206     schwarze  607:                switch (stesc[1]) {
1.207     schwarze  608:                case '*':
1.218   ! schwarze  609:                        if (arg_complete)
        !           610:                                res = roff_getstrn(r, stnam, naml);
1.206     schwarze  611:                        break;
1.207     schwarze  612:                case 'B':
1.206     schwarze  613:                        npos = 0;
1.218   ! schwarze  614:                        ubuf[0] = arg_complete &&
        !           615:                            roff_evalnum(stnam, &npos, NULL, 0) &&
        !           616:                            stnam + npos + 1 == cp ? '1' : '0';
1.206     schwarze  617:                        ubuf[1] = '\0';
                    618:                        break;
1.207     schwarze  619:                case 'n':
1.218   ! schwarze  620:                        if (arg_complete)
        !           621:                                (void)snprintf(ubuf, sizeof(ubuf), "%d",
        !           622:                                    roff_getregn(r, stnam, naml));
        !           623:                        else
        !           624:                                ubuf[0] = '\0';
1.206     schwarze  625:                        break;
1.207     schwarze  626:                case 'w':
1.218   ! schwarze  627:                        /* use even incomplete args */
1.208     schwarze  628:                        (void)snprintf(ubuf, sizeof(ubuf), "%d",
1.206     schwarze  629:                            24 * (int)naml);
                    630:                        break;
                    631:                }
1.94      kristaps  632:
                    633:                if (NULL == res) {
1.207     schwarze  634:                        mandoc_msg(MANDOCERR_BADESCAPE, r->parse,
                    635:                            ln, (int)(stesc - *bufp), NULL);
1.142     kristaps  636:                        res = "";
1.94      kristaps  637:                }
                    638:
1.108     schwarze  639:                /* Replace the escape sequence by the string. */
                    640:
1.209     schwarze  641:                *stesc = '\0';
                    642:                *szp = mandoc_asprintf(&nbuf, "%s%s%s",
                    643:                    *bufp, res, cp) + 1;
1.94      kristaps  644:
1.205     schwarze  645:                /* Prepare for the next replacement. */
1.94      kristaps  646:
1.205     schwarze  647:                start = nbuf + pos;
1.209     schwarze  648:                stesc = nbuf + (stesc - *bufp) + strlen(res);
1.94      kristaps  649:                free(*bufp);
1.181     schwarze  650:                *bufp = nbuf;
1.154     kristaps  651:        }
1.172     schwarze  652:        return(ROFF_CONT);
1.154     kristaps  653: }
                    654:
                    655: /*
1.178     schwarze  656:  * Process text streams:
                    657:  * Convert all breakable hyphens into ASCII_HYPH.
                    658:  * Decrement and spring input line trap.
1.154     kristaps  659:  */
                    660: static enum rofferr
1.178     schwarze  661: roff_parsetext(char **bufp, size_t *szp, int pos, int *offs)
1.154     kristaps  662: {
                    663:        size_t           sz;
                    664:        const char      *start;
1.178     schwarze  665:        char            *p;
                    666:        int              isz;
1.154     kristaps  667:        enum mandoc_esc  esc;
                    668:
1.178     schwarze  669:        start = p = *bufp + pos;
1.154     kristaps  670:
                    671:        while ('\0' != *p) {
                    672:                sz = strcspn(p, "-\\");
                    673:                p += sz;
                    674:
1.159     kristaps  675:                if ('\0' == *p)
                    676:                        break;
                    677:
1.154     kristaps  678:                if ('\\' == *p) {
                    679:                        /* Skip over escapes. */
                    680:                        p++;
1.189     schwarze  681:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.154     kristaps  682:                        if (ESCAPE_ERROR == esc)
                    683:                                break;
1.155     kristaps  684:                        continue;
1.159     kristaps  685:                } else if (p == start) {
1.158     kristaps  686:                        p++;
1.155     kristaps  687:                        continue;
1.158     kristaps  688:                }
1.155     kristaps  689:
1.171     schwarze  690:                if (isalpha((unsigned char)p[-1]) &&
                    691:                    isalpha((unsigned char)p[1]))
1.155     kristaps  692:                        *p = ASCII_HYPH;
                    693:                p++;
1.94      kristaps  694:        }
                    695:
1.178     schwarze  696:        /* Spring the input line trap. */
                    697:        if (1 == roffit_lines) {
1.202     schwarze  698:                isz = mandoc_asprintf(&p, "%s\n.%s", *bufp, roffit_macro);
1.178     schwarze  699:                free(*bufp);
                    700:                *bufp = p;
                    701:                *szp = isz + 1;
                    702:                *offs = 0;
                    703:                free(roffit_macro);
                    704:                roffit_lines = 0;
                    705:                return(ROFF_REPARSE);
                    706:        } else if (1 < roffit_lines)
                    707:                --roffit_lines;
1.154     kristaps  708:        return(ROFF_CONT);
1.94      kristaps  709: }
                    710:
1.67      kristaps  711: enum rofferr
1.207     schwarze  712: roff_parseln(struct roff *r, int ln, char **bufp,
1.90      kristaps  713:                size_t *szp, int pos, int *offs)
1.67      kristaps  714: {
                    715:        enum rofft       t;
1.109     kristaps  716:        enum rofferr     e;
1.130     kristaps  717:        int              ppos, ctl;
1.79      kristaps  718:
                    719:        /*
1.94      kristaps  720:         * Run the reserved-word filter only if we have some reserved
                    721:         * words to fill in.
                    722:         */
                    723:
1.172     schwarze  724:        e = roff_res(r, bufp, szp, ln, pos);
                    725:        if (ROFF_IGN == e)
                    726:                return(e);
                    727:        assert(ROFF_CONT == e);
1.94      kristaps  728:
1.130     kristaps  729:        ppos = pos;
1.174     kristaps  730:        ctl = roff_getcontrol(r, *bufp, &pos);
1.130     kristaps  731:
1.94      kristaps  732:        /*
1.79      kristaps  733:         * First, if a scope is open and we're not a macro, pass the
                    734:         * text through the macro's filter.  If a scope isn't open and
                    735:         * we're not a macro, just let it through.
1.125     kristaps  736:         * Finally, if there's an equation scope open, divert it into it
                    737:         * no matter our state.
1.79      kristaps  738:         */
1.74      kristaps  739:
1.130     kristaps  740:        if (r->last && ! ctl) {
1.78      kristaps  741:                t = r->last->tok;
                    742:                assert(roffs[t].text);
1.207     schwarze  743:                e = (*roffs[t].text)(r, t, bufp, szp, ln, pos, pos, offs);
1.109     kristaps  744:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  745:                if (ROFF_CONT != e)
                    746:                        return(e);
1.182     schwarze  747:        }
                    748:        if (r->eqn)
                    749:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
                    750:        if ( ! ctl) {
1.125     kristaps  751:                if (r->tbl)
1.130     kristaps  752:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.178     schwarze  753:                return(roff_parsetext(bufp, szp, pos, offs));
1.182     schwarze  754:        }
1.67      kristaps  755:
1.79      kristaps  756:        /*
                    757:         * If a scope is open, go to the child handler for that macro,
                    758:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  759:         * Don't do so if an equation is open.
1.79      kristaps  760:         */
1.78      kristaps  761:
1.79      kristaps  762:        if (r->last) {
                    763:                t = r->last->tok;
                    764:                assert(roffs[t].sub);
1.207     schwarze  765:                return((*roffs[t].sub)(r, t, bufp, szp,
                    766:                    ln, ppos, pos, offs));
1.79      kristaps  767:        }
1.78      kristaps  768:
1.79      kristaps  769:        /*
                    770:         * Lastly, as we've no scope open, try to look up and execute
                    771:         * the new macro.  If no macro is found, simply return and let
                    772:         * the compilers handle it.
                    773:         */
1.67      kristaps  774:
1.214     schwarze  775:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos, ln, ppos)))
1.79      kristaps  776:                return(ROFF_CONT);
1.67      kristaps  777:
1.75      kristaps  778:        assert(roffs[t].proc);
1.207     schwarze  779:        return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
1.74      kristaps  780: }
                    781:
1.117     kristaps  782: void
1.74      kristaps  783: roff_endparse(struct roff *r)
                    784: {
                    785:
1.110     kristaps  786:        if (r->last)
1.128     kristaps  787:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.207     schwarze  788:                    r->last->line, r->last->col, NULL);
1.117     kristaps  789:
1.125     kristaps  790:        if (r->eqn) {
1.207     schwarze  791:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
                    792:                    r->eqn->eqn.ln, r->eqn->eqn.pos, NULL);
1.151     kristaps  793:                eqn_end(&r->eqn);
1.125     kristaps  794:        }
                    795:
1.117     kristaps  796:        if (r->tbl) {
1.207     schwarze  797:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
                    798:                    r->tbl->line, r->tbl->pos, NULL);
1.151     kristaps  799:                tbl_end(&r->tbl);
1.117     kristaps  800:        }
1.67      kristaps  801: }
                    802:
                    803: /*
                    804:  * Parse a roff node's type from the input buffer.  This must be in the
                    805:  * form of ".foo xxx" in the usual way.
                    806:  */
                    807: static enum rofft
1.214     schwarze  808: roff_parse(struct roff *r, char *buf, int *pos, int ln, int ppos)
1.67      kristaps  809: {
1.214     schwarze  810:        char            *cp;
1.106     kristaps  811:        const char      *mac;
                    812:        size_t           maclen;
1.67      kristaps  813:        enum rofft       t;
                    814:
1.214     schwarze  815:        cp = buf + *pos;
                    816:
                    817:        if ('\0' == *cp || '"' == *cp || '\t' == *cp || ' ' == *cp)
1.67      kristaps  818:                return(ROFF_MAX);
                    819:
1.214     schwarze  820:        mac = cp;
                    821:        maclen = roff_getname(r, &cp, ln, ppos);
1.67      kristaps  822:
1.106     kristaps  823:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  824:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  825:
1.214     schwarze  826:        if (ROFF_MAX != t)
                    827:                *pos = cp - buf;
1.67      kristaps  828:
                    829:        return(t);
                    830: }
                    831:
                    832: static enum rofferr
1.76      kristaps  833: roff_cblock(ROFF_ARGS)
1.67      kristaps  834: {
                    835:
1.79      kristaps  836:        /*
                    837:         * A block-close `..' should only be invoked as a child of an
                    838:         * ignore macro, otherwise raise a warning and just ignore it.
                    839:         */
                    840:
1.76      kristaps  841:        if (NULL == r->last) {
1.128     kristaps  842:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  843:                return(ROFF_IGN);
                    844:        }
1.67      kristaps  845:
1.81      kristaps  846:        switch (r->last->tok) {
1.207     schwarze  847:        case ROFF_am:
1.81      kristaps  848:                /* FALLTHROUGH */
1.207     schwarze  849:        case ROFF_ami:
1.81      kristaps  850:                /* FALLTHROUGH */
1.207     schwarze  851:        case ROFF_am1:
1.81      kristaps  852:                /* FALLTHROUGH */
1.207     schwarze  853:        case ROFF_de:
1.108     schwarze  854:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  855:                /* FALLTHROUGH */
1.207     schwarze  856:        case ROFF_dei:
1.81      kristaps  857:                /* FALLTHROUGH */
1.207     schwarze  858:        case ROFF_ig:
1.81      kristaps  859:                break;
                    860:        default:
1.128     kristaps  861:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  862:                return(ROFF_IGN);
1.76      kristaps  863:        }
1.67      kristaps  864:
1.76      kristaps  865:        if ((*bufp)[pos])
1.217     schwarze  866:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
                    867:                    ".. %s", *bufp + pos);
1.71      kristaps  868:
                    869:        roffnode_pop(r);
1.76      kristaps  870:        roffnode_cleanscope(r);
                    871:        return(ROFF_IGN);
1.71      kristaps  872:
1.67      kristaps  873: }
                    874:
1.76      kristaps  875: static void
                    876: roffnode_cleanscope(struct roff *r)
1.67      kristaps  877: {
                    878:
1.76      kristaps  879:        while (r->last) {
1.173     schwarze  880:                if (--r->last->endspan != 0)
1.76      kristaps  881:                        break;
                    882:                roffnode_pop(r);
                    883:        }
1.67      kristaps  884: }
                    885:
1.195     schwarze  886: static void
                    887: roff_ccond(struct roff *r, int ln, int ppos)
1.74      kristaps  888: {
                    889:
1.76      kristaps  890:        if (NULL == r->last) {
1.128     kristaps  891:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.195     schwarze  892:                return;
1.76      kristaps  893:        }
                    894:
1.82      kristaps  895:        switch (r->last->tok) {
1.207     schwarze  896:        case ROFF_el:
1.82      kristaps  897:                /* FALLTHROUGH */
1.207     schwarze  898:        case ROFF_ie:
1.82      kristaps  899:                /* FALLTHROUGH */
1.207     schwarze  900:        case ROFF_if:
1.82      kristaps  901:                break;
                    902:        default:
1.128     kristaps  903:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.195     schwarze  904:                return;
1.75      kristaps  905:        }
                    906:
1.76      kristaps  907:        if (r->last->endspan > -1) {
1.128     kristaps  908:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.195     schwarze  909:                return;
1.76      kristaps  910:        }
                    911:
1.75      kristaps  912:        roffnode_pop(r);
1.76      kristaps  913:        roffnode_cleanscope(r);
1.195     schwarze  914:        return;
1.76      kristaps  915: }
                    916:
                    917: static enum rofferr
1.80      kristaps  918: roff_block(ROFF_ARGS)
1.76      kristaps  919: {
1.213     schwarze  920:        char            *name, *cp;
                    921:        size_t           namesz;
1.106     kristaps  922:
1.213     schwarze  923:        name = cp = *bufp + pos;
                    924:        namesz = 0;
1.76      kristaps  925:
1.106     kristaps  926:        if (ROFF_ig != tok) {
1.213     schwarze  927:                if ('\0' == *cp) {
1.216     schwarze  928:                        mandoc_msg(MANDOCERR_REQ_EMPTY, r->parse,
                    929:                            ln, ppos, roffs[tok].name);
1.106     kristaps  930:                        return(ROFF_IGN);
                    931:                }
1.107     kristaps  932:
                    933:                /*
                    934:                 * Re-write `de1', since we don't really care about
                    935:                 * groff's strange compatibility mode, into `de'.
                    936:                 */
                    937:
1.106     kristaps  938:                if (ROFF_de1 == tok)
                    939:                        tok = ROFF_de;
1.213     schwarze  940:                else if (ROFF_de != tok)
1.128     kristaps  941:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  942:                            roffs[tok].name);
1.107     kristaps  943:
1.213     schwarze  944:                namesz = roff_getname(r, &cp, ln, ppos);
                    945:                name[namesz] = '\0';
                    946:        } else
                    947:                name = NULL;
1.80      kristaps  948:
1.106     kristaps  949:        roffnode_push(r, tok, name, ln, ppos);
                    950:
                    951:        /*
                    952:         * At the beginning of a `de' macro, clear the existing string
                    953:         * with the same name, if there is one.  New content will be
1.193     schwarze  954:         * appended from roff_block_text() in multiline mode.
1.106     kristaps  955:         */
1.107     kristaps  956:
1.213     schwarze  957:        if (namesz && ROFF_de == tok)
                    958:                roff_setstrn(&r->strtab, name, namesz, "", 0, 0);
1.76      kristaps  959:
1.213     schwarze  960:        if ('\0' == *cp)
1.78      kristaps  961:                return(ROFF_IGN);
                    962:
1.107     kristaps  963:        /* If present, process the custom end-of-line marker. */
                    964:
1.213     schwarze  965:        name = cp;
                    966:        namesz = roff_getname(r, &cp, ln, ppos);
                    967:        if (namesz)
                    968:                r->last->end = mandoc_strndup(name, namesz);
1.78      kristaps  969:
1.213     schwarze  970:        if ('\0' != *cp)
1.217     schwarze  971:                mandoc_vmsg(MANDOCERR_ARG_EXCESS, r->parse,
                    972:                    ln, pos, ".%s ... %s", roffs[tok].name, cp);
1.74      kristaps  973:
1.78      kristaps  974:        return(ROFF_IGN);
                    975: }
                    976:
                    977: static enum rofferr
1.80      kristaps  978: roff_block_sub(ROFF_ARGS)
1.79      kristaps  979: {
                    980:        enum rofft      t;
                    981:        int             i, j;
                    982:
                    983:        /*
                    984:         * First check whether a custom macro exists at this level.  If
                    985:         * it does, then check against it.  This is some of groff's
                    986:         * stranger behaviours.  If we encountered a custom end-scope
                    987:         * tag and that tag also happens to be a "real" macro, then we
                    988:         * need to try interpreting it again as a real macro.  If it's
                    989:         * not, then return ignore.  Else continue.
                    990:         */
                    991:
                    992:        if (r->last->end) {
1.130     kristaps  993:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  994:                        if ((*bufp)[i] != r->last->end[j])
                    995:                                break;
                    996:
1.207     schwarze  997:                if ('\0' == r->last->end[j] &&
                    998:                    ('\0' == (*bufp)[i] ||
                    999:                     ' '  == (*bufp)[i] ||
                   1000:                     '\t' == (*bufp)[i])) {
1.79      kristaps 1001:                        roffnode_pop(r);
                   1002:                        roffnode_cleanscope(r);
                   1003:
1.130     kristaps 1004:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                   1005:                                i++;
                   1006:
                   1007:                        pos = i;
1.214     schwarze 1008:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos, ln, ppos))
1.79      kristaps 1009:                                return(ROFF_RERUN);
                   1010:                        return(ROFF_IGN);
                   1011:                }
                   1012:        }
                   1013:
                   1014:        /*
                   1015:         * If we have no custom end-query or lookup failed, then try
                   1016:         * pulling it out of the hashtable.
                   1017:         */
                   1018:
1.214     schwarze 1019:        t = roff_parse(r, *bufp, &pos, ln, ppos);
1.79      kristaps 1020:
1.106     kristaps 1021:        /*
                   1022:         * Macros other than block-end are only significant
                   1023:         * in `de' blocks; elsewhere, simply throw them away.
                   1024:         */
                   1025:        if (ROFF_cblock != t) {
                   1026:                if (ROFF_de == tok)
1.193     schwarze 1027:                        roff_setstr(r, r->last->name, *bufp + ppos, 2);
1.79      kristaps 1028:                return(ROFF_IGN);
1.106     kristaps 1029:        }
1.79      kristaps 1030:
                   1031:        assert(roffs[t].proc);
1.207     schwarze 1032:        return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
1.79      kristaps 1033: }
                   1034:
                   1035: static enum rofferr
1.80      kristaps 1036: roff_block_text(ROFF_ARGS)
1.78      kristaps 1037: {
                   1038:
1.106     kristaps 1039:        if (ROFF_de == tok)
1.193     schwarze 1040:                roff_setstr(r, r->last->name, *bufp + pos, 2);
1.106     kristaps 1041:
1.78      kristaps 1042:        return(ROFF_IGN);
                   1043: }
                   1044:
                   1045: static enum rofferr
1.82      kristaps 1046: roff_cond_sub(ROFF_ARGS)
                   1047: {
                   1048:        enum rofft       t;
1.139     kristaps 1049:        char            *ep;
1.198     schwarze 1050:        int              rr;
1.82      kristaps 1051:
                   1052:        rr = r->last->rule;
1.139     kristaps 1053:        roffnode_cleanscope(r);
1.214     schwarze 1054:        t = roff_parse(r, *bufp, &pos, ln, ppos);
1.82      kristaps 1055:
1.139     kristaps 1056:        /*
1.177     schwarze 1057:         * Fully handle known macros when they are structurally
                   1058:         * required or when the conditional evaluated to true.
1.87      kristaps 1059:         */
                   1060:
1.177     schwarze 1061:        if ((ROFF_MAX != t) &&
1.198     schwarze 1062:            (rr || ROFFMAC_STRUCT & roffs[t].flags)) {
1.177     schwarze 1063:                assert(roffs[t].proc);
                   1064:                return((*roffs[t].proc)(r, t, bufp, szp,
1.207     schwarze 1065:                    ln, ppos, pos, offs));
1.177     schwarze 1066:        }
1.144     kristaps 1067:
1.196     schwarze 1068:        /*
                   1069:         * If `\}' occurs on a macro line without a preceding macro,
                   1070:         * drop the line completely.
                   1071:         */
                   1072:
                   1073:        ep = *bufp + pos;
                   1074:        if ('\\' == ep[0] && '}' == ep[1])
1.198     schwarze 1075:                rr = 0;
1.196     schwarze 1076:
1.177     schwarze 1077:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1078:
1.177     schwarze 1079:        while (NULL != (ep = strchr(ep, '\\'))) {
1.197     schwarze 1080:                if ('}' == *(++ep)) {
                   1081:                        *ep = '&';
                   1082:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1083:                }
                   1084:                ++ep;
1.177     schwarze 1085:        }
1.198     schwarze 1086:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1087: }
                   1088:
                   1089: static enum rofferr
                   1090: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1091: {
1.140     kristaps 1092:        char            *ep;
1.198     schwarze 1093:        int              rr;
1.82      kristaps 1094:
                   1095:        rr = r->last->rule;
1.140     kristaps 1096:        roffnode_cleanscope(r);
1.82      kristaps 1097:
1.197     schwarze 1098:        ep = *bufp + pos;
                   1099:        while (NULL != (ep = strchr(ep, '\\'))) {
                   1100:                if ('}' == *(++ep)) {
                   1101:                        *ep = '&';
                   1102:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1103:                }
                   1104:                ++ep;
1.78      kristaps 1105:        }
1.198     schwarze 1106:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1107: }
                   1108:
1.204     schwarze 1109: /*
                   1110:  * Parse a single signed integer number.  Stop at the first non-digit.
                   1111:  * If there is at least one digit, return success and advance the
                   1112:  * parse point, else return failure and let the parse point unchanged.
                   1113:  * Ignore overflows, treat them just like the C language.
                   1114:  */
1.184     schwarze 1115: static int
                   1116: roff_getnum(const char *v, int *pos, int *res)
                   1117: {
1.206     schwarze 1118:        int      myres, n, p;
                   1119:
                   1120:        if (NULL == res)
                   1121:                res = &myres;
1.184     schwarze 1122:
                   1123:        p = *pos;
                   1124:        n = v[p] == '-';
                   1125:        if (n)
                   1126:                p++;
                   1127:
                   1128:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204     schwarze 1129:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1130:        if (p == *pos + n)
                   1131:                return 0;
                   1132:
                   1133:        if (n)
                   1134:                *res = -*res;
                   1135:
                   1136:        *pos = p;
                   1137:        return 1;
                   1138: }
                   1139:
1.198     schwarze 1140: /*
                   1141:  * Evaluate a string comparison condition.
                   1142:  * The first character is the delimiter.
                   1143:  * Succeed if the string up to its second occurrence
                   1144:  * matches the string up to its third occurence.
                   1145:  * Advance the cursor after the third occurrence
                   1146:  * or lacking that, to the end of the line.
                   1147:  */
                   1148: static int
                   1149: roff_evalstrcond(const char *v, int *pos)
                   1150: {
                   1151:        const char      *s1, *s2, *s3;
                   1152:        int              match;
                   1153:
                   1154:        match = 0;
                   1155:        s1 = v + *pos;          /* initial delimiter */
                   1156:        s2 = s1 + 1;            /* for scanning the first string */
                   1157:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1158:
                   1159:        if (NULL == s3)         /* found no middle delimiter */
                   1160:                goto out;
                   1161:
                   1162:        while ('\0' != *++s3) {
                   1163:                if (*s2 != *s3) {  /* mismatch */
                   1164:                        s3 = strchr(s3, *s1);
                   1165:                        break;
                   1166:                }
                   1167:                if (*s3 == *s1) {  /* found the final delimiter */
                   1168:                        match = 1;
                   1169:                        break;
                   1170:                }
                   1171:                s2++;
                   1172:        }
                   1173:
                   1174: out:
                   1175:        if (NULL == s3)
                   1176:                s3 = strchr(s2, '\0');
                   1177:        else
                   1178:                s3++;
                   1179:        *pos = s3 - v;
                   1180:        return(match);
                   1181: }
                   1182:
1.204     schwarze 1183: /*
                   1184:  * Evaluate an optionally negated single character, numerical,
                   1185:  * or string condition.
                   1186:  */
1.198     schwarze 1187: static int
1.88      kristaps 1188: roff_evalcond(const char *v, int *pos)
                   1189: {
1.204     schwarze 1190:        int      wanttrue, number;
1.88      kristaps 1191:
1.198     schwarze 1192:        if ('!' == v[*pos]) {
                   1193:                wanttrue = 0;
                   1194:                (*pos)++;
                   1195:        } else
                   1196:                wanttrue = 1;
                   1197:
1.88      kristaps 1198:        switch (v[*pos]) {
1.207     schwarze 1199:        case 'n':
1.198     schwarze 1200:                /* FALLTHROUGH */
1.207     schwarze 1201:        case 'o':
1.88      kristaps 1202:                (*pos)++;
1.198     schwarze 1203:                return(wanttrue);
1.207     schwarze 1204:        case 'c':
1.198     schwarze 1205:                /* FALLTHROUGH */
1.207     schwarze 1206:        case 'd':
1.198     schwarze 1207:                /* FALLTHROUGH */
1.207     schwarze 1208:        case 'e':
1.88      kristaps 1209:                /* FALLTHROUGH */
1.207     schwarze 1210:        case 'r':
1.88      kristaps 1211:                /* FALLTHROUGH */
1.207     schwarze 1212:        case 't':
1.88      kristaps 1213:                (*pos)++;
1.198     schwarze 1214:                return(!wanttrue);
1.88      kristaps 1215:        default:
                   1216:                break;
                   1217:        }
                   1218:
1.204     schwarze 1219:        if (roff_evalnum(v, pos, &number, 0))
                   1220:                return((number > 0) == wanttrue);
                   1221:        else
1.198     schwarze 1222:                return(roff_evalstrcond(v, pos) == wanttrue);
1.88      kristaps 1223: }
                   1224:
1.74      kristaps 1225: static enum rofferr
1.103     kristaps 1226: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1227: {
1.123     schwarze 1228:
1.89      kristaps 1229:        return(ROFF_IGN);
                   1230: }
                   1231:
1.104     kristaps 1232: static enum rofferr
1.82      kristaps 1233: roff_cond(ROFF_ARGS)
1.74      kristaps 1234: {
1.173     schwarze 1235:
                   1236:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1237:
1.207     schwarze 1238:        /*
1.134     kristaps 1239:         * An `.el' has no conditional body: it will consume the value
                   1240:         * of the current rstack entry set in prior `ie' calls or
1.207     schwarze 1241:         * defaults to DENY.
1.134     kristaps 1242:         *
                   1243:         * If we're not an `el', however, then evaluate the conditional.
                   1244:         */
1.133     kristaps 1245:
1.173     schwarze 1246:        r->last->rule = ROFF_el == tok ?
1.207     schwarze 1247:            (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
                   1248:            roff_evalcond(*bufp, &pos);
1.77      kristaps 1249:
1.134     kristaps 1250:        /*
                   1251:         * An if-else will put the NEGATION of the current evaluated
                   1252:         * conditional into the stack of rules.
                   1253:         */
                   1254:
1.84      schwarze 1255:        if (ROFF_ie == tok) {
1.134     kristaps 1256:                if (r->rstackpos == RSTACK_MAX - 1) {
1.207     schwarze 1257:                        mandoc_msg(MANDOCERR_MEM,
                   1258:                            r->parse, ln, ppos, NULL);
1.134     kristaps 1259:                        return(ROFF_ERR);
                   1260:                }
1.198     schwarze 1261:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1262:        }
1.88      kristaps 1263:
                   1264:        /* If the parent has false as its rule, then so do we. */
                   1265:
1.198     schwarze 1266:        if (r->last->parent && !r->last->parent->rule)
                   1267:                r->last->rule = 0;
1.88      kristaps 1268:
                   1269:        /*
1.173     schwarze 1270:         * Determine scope.
                   1271:         * If there is nothing on the line after the conditional,
                   1272:         * not even whitespace, use next-line scope.
1.88      kristaps 1273:         */
1.74      kristaps 1274:
1.173     schwarze 1275:        if ('\0' == (*bufp)[pos]) {
                   1276:                r->last->endspan = 2;
                   1277:                goto out;
                   1278:        }
                   1279:
                   1280:        while (' ' == (*bufp)[pos])
                   1281:                pos++;
                   1282:
                   1283:        /* An opening brace requests multiline scope. */
1.75      kristaps 1284:
                   1285:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1286:                r->last->endspan = -1;
                   1287:                pos += 2;
1.173     schwarze 1288:                goto out;
1.207     schwarze 1289:        }
1.74      kristaps 1290:
1.77      kristaps 1291:        /*
1.173     schwarze 1292:         * Anything else following the conditional causes
                   1293:         * single-line scope.  Warn if the scope contains
                   1294:         * nothing but trailing whitespace.
1.77      kristaps 1295:         */
                   1296:
1.75      kristaps 1297:        if ('\0' == (*bufp)[pos])
1.216     schwarze 1298:                mandoc_msg(MANDOCERR_COND_EMPTY, r->parse,
                   1299:                    ln, ppos, roffs[tok].name);
1.77      kristaps 1300:
1.173     schwarze 1301:        r->last->endspan = 1;
1.74      kristaps 1302:
1.173     schwarze 1303: out:
1.75      kristaps 1304:        *offs = pos;
                   1305:        return(ROFF_RERUN);
1.83      schwarze 1306: }
                   1307:
                   1308: static enum rofferr
1.92      schwarze 1309: roff_ds(ROFF_ARGS)
                   1310: {
1.212     schwarze 1311:        char            *string;
                   1312:        const char      *name;
                   1313:        size_t           namesz;
1.96      kristaps 1314:
                   1315:        /*
1.212     schwarze 1316:         * The first word is the name of the string.
                   1317:         * If it is empty or terminated by an escape sequence,
                   1318:         * abort the `ds' request without defining anything.
1.96      kristaps 1319:         */
1.92      schwarze 1320:
1.212     schwarze 1321:        name = string = *bufp + pos;
1.92      schwarze 1322:        if ('\0' == *name)
                   1323:                return(ROFF_IGN);
                   1324:
1.212     schwarze 1325:        namesz = roff_getname(r, &string, ln, pos);
                   1326:        if ('\\' == name[namesz])
                   1327:                return(ROFF_IGN);
                   1328:
                   1329:        /* Read past the initial double-quote, if any. */
1.121     schwarze 1330:        if ('"' == *string)
1.92      schwarze 1331:                string++;
                   1332:
1.96      kristaps 1333:        /* The rest is the value. */
1.212     schwarze 1334:        roff_setstrn(&r->strtab, name, namesz, string, strlen(string),
                   1335:            ROFF_as == tok);
1.92      schwarze 1336:        return(ROFF_IGN);
                   1337: }
                   1338:
1.204     schwarze 1339: /*
                   1340:  * Parse a single operator, one or two characters long.
                   1341:  * If the operator is recognized, return success and advance the
                   1342:  * parse point, else return failure and let the parse point unchanged.
                   1343:  */
                   1344: static int
                   1345: roff_getop(const char *v, int *pos, char *res)
                   1346: {
                   1347:
                   1348:        *res = v[*pos];
                   1349:
                   1350:        switch (*res) {
1.207     schwarze 1351:        case '+':
1.204     schwarze 1352:                /* FALLTHROUGH */
1.207     schwarze 1353:        case '-':
1.204     schwarze 1354:                /* FALLTHROUGH */
1.207     schwarze 1355:        case '*':
1.204     schwarze 1356:                /* FALLTHROUGH */
1.207     schwarze 1357:        case '/':
1.204     schwarze 1358:                /* FALLTHROUGH */
1.207     schwarze 1359:        case '%':
1.204     schwarze 1360:                /* FALLTHROUGH */
1.207     schwarze 1361:        case '&':
1.204     schwarze 1362:                /* FALLTHROUGH */
1.207     schwarze 1363:        case ':':
1.204     schwarze 1364:                break;
                   1365:        case '<':
                   1366:                switch (v[*pos + 1]) {
1.207     schwarze 1367:                case '=':
1.204     schwarze 1368:                        *res = 'l';
                   1369:                        (*pos)++;
                   1370:                        break;
1.207     schwarze 1371:                case '>':
1.204     schwarze 1372:                        *res = '!';
                   1373:                        (*pos)++;
                   1374:                        break;
1.207     schwarze 1375:                case '?':
1.204     schwarze 1376:                        *res = 'i';
                   1377:                        (*pos)++;
                   1378:                        break;
                   1379:                default:
                   1380:                        break;
                   1381:                }
                   1382:                break;
                   1383:        case '>':
                   1384:                switch (v[*pos + 1]) {
1.207     schwarze 1385:                case '=':
1.204     schwarze 1386:                        *res = 'g';
                   1387:                        (*pos)++;
                   1388:                        break;
1.207     schwarze 1389:                case '?':
1.204     schwarze 1390:                        *res = 'a';
                   1391:                        (*pos)++;
                   1392:                        break;
                   1393:                default:
                   1394:                        break;
                   1395:                }
                   1396:                break;
                   1397:        case '=':
                   1398:                if ('=' == v[*pos + 1])
                   1399:                        (*pos)++;
                   1400:                break;
                   1401:        default:
                   1402:                return(0);
                   1403:        }
                   1404:        (*pos)++;
                   1405:
                   1406:        return(*res);
                   1407: }
                   1408:
                   1409: /*
                   1410:  * Evaluate either a parenthesized numeric expression
                   1411:  * or a single signed integer number.
                   1412:  */
                   1413: static int
                   1414: roff_evalpar(const char *v, int *pos, int *res)
                   1415: {
                   1416:
                   1417:        if ('(' != v[*pos])
                   1418:                return(roff_getnum(v, pos, res));
                   1419:
                   1420:        (*pos)++;
                   1421:        if ( ! roff_evalnum(v, pos, res, 1))
                   1422:                return(0);
                   1423:
1.206     schwarze 1424:        /*
                   1425:         * Omission of the closing parenthesis
                   1426:         * is an error in validation mode,
                   1427:         * but ignored in evaluation mode.
                   1428:         */
                   1429:
1.204     schwarze 1430:        if (')' == v[*pos])
                   1431:                (*pos)++;
1.206     schwarze 1432:        else if (NULL == res)
                   1433:                return(0);
1.204     schwarze 1434:
                   1435:        return(1);
                   1436: }
                   1437:
                   1438: /*
                   1439:  * Evaluate a complete numeric expression.
                   1440:  * Proceed left to right, there is no concept of precedence.
                   1441:  */
                   1442: static int
                   1443: roff_evalnum(const char *v, int *pos, int *res, int skipwhite)
                   1444: {
                   1445:        int              mypos, operand2;
                   1446:        char             operator;
                   1447:
                   1448:        if (NULL == pos) {
                   1449:                mypos = 0;
                   1450:                pos = &mypos;
                   1451:        }
                   1452:
                   1453:        if (skipwhite)
                   1454:                while (isspace((unsigned char)v[*pos]))
                   1455:                        (*pos)++;
                   1456:
                   1457:        if ( ! roff_evalpar(v, pos, res))
                   1458:                return(0);
                   1459:
                   1460:        while (1) {
                   1461:                if (skipwhite)
                   1462:                        while (isspace((unsigned char)v[*pos]))
                   1463:                                (*pos)++;
                   1464:
                   1465:                if ( ! roff_getop(v, pos, &operator))
                   1466:                        break;
                   1467:
                   1468:                if (skipwhite)
                   1469:                        while (isspace((unsigned char)v[*pos]))
                   1470:                                (*pos)++;
                   1471:
                   1472:                if ( ! roff_evalpar(v, pos, &operand2))
                   1473:                        return(0);
                   1474:
                   1475:                if (skipwhite)
                   1476:                        while (isspace((unsigned char)v[*pos]))
                   1477:                                (*pos)++;
1.206     schwarze 1478:
                   1479:                if (NULL == res)
                   1480:                        continue;
1.204     schwarze 1481:
                   1482:                switch (operator) {
1.207     schwarze 1483:                case '+':
1.204     schwarze 1484:                        *res += operand2;
                   1485:                        break;
1.207     schwarze 1486:                case '-':
1.204     schwarze 1487:                        *res -= operand2;
                   1488:                        break;
1.207     schwarze 1489:                case '*':
1.204     schwarze 1490:                        *res *= operand2;
                   1491:                        break;
1.207     schwarze 1492:                case '/':
1.204     schwarze 1493:                        *res /= operand2;
                   1494:                        break;
1.207     schwarze 1495:                case '%':
1.204     schwarze 1496:                        *res %= operand2;
                   1497:                        break;
1.207     schwarze 1498:                case '<':
1.204     schwarze 1499:                        *res = *res < operand2;
                   1500:                        break;
1.207     schwarze 1501:                case '>':
1.204     schwarze 1502:                        *res = *res > operand2;
                   1503:                        break;
1.207     schwarze 1504:                case 'l':
1.204     schwarze 1505:                        *res = *res <= operand2;
                   1506:                        break;
1.207     schwarze 1507:                case 'g':
1.204     schwarze 1508:                        *res = *res >= operand2;
                   1509:                        break;
1.207     schwarze 1510:                case '=':
1.204     schwarze 1511:                        *res = *res == operand2;
                   1512:                        break;
1.207     schwarze 1513:                case '!':
1.204     schwarze 1514:                        *res = *res != operand2;
                   1515:                        break;
1.207     schwarze 1516:                case '&':
1.204     schwarze 1517:                        *res = *res && operand2;
                   1518:                        break;
1.207     schwarze 1519:                case ':':
1.204     schwarze 1520:                        *res = *res || operand2;
                   1521:                        break;
1.207     schwarze 1522:                case 'i':
1.204     schwarze 1523:                        if (operand2 < *res)
                   1524:                                *res = operand2;
                   1525:                        break;
1.207     schwarze 1526:                case 'a':
1.204     schwarze 1527:                        if (operand2 > *res)
                   1528:                                *res = operand2;
                   1529:                        break;
                   1530:                default:
                   1531:                        abort();
                   1532:                }
                   1533:        }
                   1534:        return(1);
                   1535: }
                   1536:
1.180     schwarze 1537: void
1.187     schwarze 1538: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1539: {
1.180     schwarze 1540:        struct roffreg  *reg;
                   1541:
                   1542:        /* Search for an existing register with the same name. */
                   1543:        reg = r->regtab;
                   1544:
                   1545:        while (reg && strcmp(name, reg->key.p))
                   1546:                reg = reg->next;
1.147     kristaps 1547:
1.180     schwarze 1548:        if (NULL == reg) {
                   1549:                /* Create a new register. */
                   1550:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1551:                reg->key.p = mandoc_strdup(name);
                   1552:                reg->key.sz = strlen(name);
1.187     schwarze 1553:                reg->val = 0;
1.180     schwarze 1554:                reg->next = r->regtab;
                   1555:                r->regtab = reg;
                   1556:        }
                   1557:
1.187     schwarze 1558:        if ('+' == sign)
                   1559:                reg->val += val;
                   1560:        else if ('-' == sign)
                   1561:                reg->val -= val;
                   1562:        else
                   1563:                reg->val = val;
1.147     kristaps 1564: }
                   1565:
1.192     schwarze 1566: /*
                   1567:  * Handle some predefined read-only number registers.
                   1568:  * For now, return -1 if the requested register is not predefined;
                   1569:  * in case a predefined read-only register having the value -1
                   1570:  * were to turn up, another special value would have to be chosen.
                   1571:  */
                   1572: static int
                   1573: roff_getregro(const char *name)
                   1574: {
                   1575:
                   1576:        switch (*name) {
1.207     schwarze 1577:        case 'A':  /* ASCII approximation mode is always off. */
1.192     schwarze 1578:                return(0);
1.207     schwarze 1579:        case 'g':  /* Groff compatibility mode is always on. */
1.192     schwarze 1580:                return(1);
1.207     schwarze 1581:        case 'H':  /* Fixed horizontal resolution. */
1.192     schwarze 1582:                return (24);
1.207     schwarze 1583:        case 'j':  /* Always adjust left margin only. */
1.192     schwarze 1584:                return(0);
1.207     schwarze 1585:        case 'T':  /* Some output device is always defined. */
1.192     schwarze 1586:                return(1);
1.207     schwarze 1587:        case 'V':  /* Fixed vertical resolution. */
1.192     schwarze 1588:                return (40);
                   1589:        default:
                   1590:                return (-1);
                   1591:        }
                   1592: }
                   1593:
1.181     schwarze 1594: int
1.180     schwarze 1595: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1596: {
1.180     schwarze 1597:        struct roffreg  *reg;
1.192     schwarze 1598:        int              val;
                   1599:
                   1600:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1601:                val = roff_getregro(name + 1);
                   1602:                if (-1 != val)
                   1603:                        return (val);
                   1604:        }
1.180     schwarze 1605:
                   1606:        for (reg = r->regtab; reg; reg = reg->next)
                   1607:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1608:                        return(reg->val);
                   1609:
                   1610:        return(0);
                   1611: }
                   1612:
                   1613: static int
                   1614: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1615: {
                   1616:        struct roffreg  *reg;
1.192     schwarze 1617:        int              val;
                   1618:
                   1619:        if ('.' == name[0] && 2 == len) {
                   1620:                val = roff_getregro(name + 1);
                   1621:                if (-1 != val)
                   1622:                        return (val);
                   1623:        }
1.181     schwarze 1624:
                   1625:        for (reg = r->regtab; reg; reg = reg->next)
                   1626:                if (len == reg->key.sz &&
                   1627:                    0 == strncmp(name, reg->key.p, len))
                   1628:                        return(reg->val);
1.147     kristaps 1629:
1.180     schwarze 1630:        return(0);
1.147     kristaps 1631: }
                   1632:
1.180     schwarze 1633: static void
                   1634: roff_freereg(struct roffreg *reg)
1.147     kristaps 1635: {
1.180     schwarze 1636:        struct roffreg  *old_reg;
1.147     kristaps 1637:
1.180     schwarze 1638:        while (NULL != reg) {
                   1639:                free(reg->key.p);
                   1640:                old_reg = reg;
                   1641:                reg = reg->next;
                   1642:                free(old_reg);
                   1643:        }
1.147     kristaps 1644: }
1.92      schwarze 1645:
                   1646: static enum rofferr
1.89      kristaps 1647: roff_nr(ROFF_ARGS)
1.83      schwarze 1648: {
1.212     schwarze 1649:        char            *key, *val;
                   1650:        size_t           keysz;
1.138     kristaps 1651:        int              iv;
1.187     schwarze 1652:        char             sign;
1.89      kristaps 1653:
1.212     schwarze 1654:        key = val = *bufp + pos;
                   1655:        if ('\0' == *key)
                   1656:                return(ROFF_IGN);
                   1657:
                   1658:        keysz = roff_getname(r, &val, ln, pos);
                   1659:        if ('\\' == key[keysz])
                   1660:                return(ROFF_IGN);
                   1661:        key[keysz] = '\0';
1.89      kristaps 1662:
1.187     schwarze 1663:        sign = *val;
                   1664:        if ('+' == sign || '-' == sign)
                   1665:                val++;
                   1666:
1.204     schwarze 1667:        if (roff_evalnum(val, NULL, &iv, 0))
                   1668:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1669:
1.203     schwarze 1670:        return(ROFF_IGN);
                   1671: }
                   1672:
                   1673: static enum rofferr
                   1674: roff_rr(ROFF_ARGS)
                   1675: {
                   1676:        struct roffreg  *reg, **prev;
1.212     schwarze 1677:        char            *name, *cp;
                   1678:        size_t           namesz;
1.203     schwarze 1679:
1.212     schwarze 1680:        name = cp = *bufp + pos;
                   1681:        if ('\0' == *name)
                   1682:                return(ROFF_IGN);
                   1683:        namesz = roff_getname(r, &cp, ln, pos);
                   1684:        name[namesz] = '\0';
1.203     schwarze 1685:
                   1686:        prev = &r->regtab;
                   1687:        while (1) {
                   1688:                reg = *prev;
                   1689:                if (NULL == reg || !strcmp(name, reg->key.p))
                   1690:                        break;
                   1691:                prev = &reg->next;
                   1692:        }
                   1693:        if (NULL != reg) {
                   1694:                *prev = reg->next;
                   1695:                free(reg->key.p);
                   1696:                free(reg);
                   1697:        }
1.122     schwarze 1698:        return(ROFF_IGN);
                   1699: }
                   1700:
                   1701: static enum rofferr
                   1702: roff_rm(ROFF_ARGS)
                   1703: {
                   1704:        const char       *name;
                   1705:        char             *cp;
1.212     schwarze 1706:        size_t            namesz;
1.122     schwarze 1707:
                   1708:        cp = *bufp + pos;
                   1709:        while ('\0' != *cp) {
1.212     schwarze 1710:                name = cp;
                   1711:                namesz = roff_getname(r, &cp, ln, (int)(cp - *bufp));
                   1712:                roff_setstrn(&r->strtab, name, namesz, NULL, 0, 0);
                   1713:                if ('\\' == name[namesz])
                   1714:                        break;
1.122     schwarze 1715:        }
1.178     schwarze 1716:        return(ROFF_IGN);
                   1717: }
                   1718:
                   1719: static enum rofferr
                   1720: roff_it(ROFF_ARGS)
                   1721: {
                   1722:        char            *cp;
                   1723:        size_t           len;
                   1724:        int              iv;
                   1725:
                   1726:        /* Parse the number of lines. */
                   1727:        cp = *bufp + pos;
                   1728:        len = strcspn(cp, " \t");
                   1729:        cp[len] = '\0';
                   1730:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
                   1731:                mandoc_msg(MANDOCERR_NUMERIC, r->parse,
1.207     schwarze 1732:                    ln, ppos, *bufp + 1);
1.178     schwarze 1733:                return(ROFF_IGN);
                   1734:        }
                   1735:        cp += len + 1;
                   1736:
                   1737:        /* Arm the input line trap. */
                   1738:        roffit_lines = iv;
                   1739:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1740:        return(ROFF_IGN);
1.175     schwarze 1741: }
                   1742:
                   1743: static enum rofferr
                   1744: roff_Dd(ROFF_ARGS)
                   1745: {
                   1746:        const char *const       *cp;
                   1747:
1.199     schwarze 1748:        if (0 == ((MPARSE_MDOC | MPARSE_QUICK) & r->options))
1.175     schwarze 1749:                for (cp = __mdoc_reserved; *cp; cp++)
                   1750:                        roff_setstr(r, *cp, NULL, 0);
                   1751:
                   1752:        return(ROFF_CONT);
                   1753: }
                   1754:
                   1755: static enum rofferr
                   1756: roff_TH(ROFF_ARGS)
                   1757: {
                   1758:        const char *const       *cp;
                   1759:
1.199     schwarze 1760:        if (0 == (MPARSE_QUICK & r->options))
1.175     schwarze 1761:                for (cp = __man_reserved; *cp; cp++)
                   1762:                        roff_setstr(r, *cp, NULL, 0);
                   1763:
                   1764:        return(ROFF_CONT);
1.109     kristaps 1765: }
                   1766:
                   1767: static enum rofferr
                   1768: roff_TE(ROFF_ARGS)
                   1769: {
                   1770:
                   1771:        if (NULL == r->tbl)
1.128     kristaps 1772:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1773:        else
1.151     kristaps 1774:                tbl_end(&r->tbl);
1.109     kristaps 1775:
1.112     kristaps 1776:        return(ROFF_IGN);
                   1777: }
                   1778:
                   1779: static enum rofferr
                   1780: roff_T_(ROFF_ARGS)
                   1781: {
                   1782:
                   1783:        if (NULL == r->tbl)
1.128     kristaps 1784:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1785:        else
1.116     kristaps 1786:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1787:
1.109     kristaps 1788:        return(ROFF_IGN);
                   1789: }
                   1790:
1.156     kristaps 1791: #if 0
                   1792: static int
1.151     kristaps 1793: roff_closeeqn(struct roff *r)
                   1794: {
                   1795:
                   1796:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1797: }
1.156     kristaps 1798: #endif
1.151     kristaps 1799:
1.156     kristaps 1800: static void
1.207     schwarze 1801: roff_openeqn(struct roff *r, const char *name, int line,
1.151     kristaps 1802:                int offs, const char *buf)
1.125     kristaps 1803: {
1.151     kristaps 1804:        struct eqn_node *e;
                   1805:        int              poff;
1.125     kristaps 1806:
                   1807:        assert(NULL == r->eqn);
1.151     kristaps 1808:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1809:
                   1810:        if (r->last_eqn)
                   1811:                r->last_eqn->next = e;
                   1812:        else
                   1813:                r->first_eqn = r->last_eqn = e;
                   1814:
                   1815:        r->eqn = r->last_eqn = e;
1.151     kristaps 1816:
                   1817:        if (buf) {
                   1818:                poff = 0;
                   1819:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1820:        }
                   1821: }
                   1822:
                   1823: static enum rofferr
                   1824: roff_EQ(ROFF_ARGS)
                   1825: {
                   1826:
                   1827:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1828:        return(ROFF_IGN);
                   1829: }
                   1830:
                   1831: static enum rofferr
                   1832: roff_EN(ROFF_ARGS)
                   1833: {
                   1834:
1.128     kristaps 1835:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1836:        return(ROFF_IGN);
                   1837: }
                   1838:
                   1839: static enum rofferr
1.109     kristaps 1840: roff_TS(ROFF_ARGS)
                   1841: {
1.176     schwarze 1842:        struct tbl_node *tbl;
1.89      kristaps 1843:
1.115     kristaps 1844:        if (r->tbl) {
1.128     kristaps 1845:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.151     kristaps 1846:                tbl_end(&r->tbl);
1.115     kristaps 1847:        }
1.83      schwarze 1848:
1.176     schwarze 1849:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1850:
                   1851:        if (r->last_tbl)
1.176     schwarze 1852:                r->last_tbl->next = tbl;
1.113     kristaps 1853:        else
1.176     schwarze 1854:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 1855:
1.176     schwarze 1856:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 1857:        return(ROFF_IGN);
1.92      schwarze 1858: }
                   1859:
1.105     kristaps 1860: static enum rofferr
1.174     kristaps 1861: roff_cc(ROFF_ARGS)
                   1862: {
                   1863:        const char      *p;
                   1864:
                   1865:        p = *bufp + pos;
                   1866:
                   1867:        if ('\0' == *p || '.' == (r->control = *p++))
                   1868:                r->control = 0;
                   1869:
                   1870:        if ('\0' != *p)
                   1871:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1872:
                   1873:        return(ROFF_IGN);
                   1874: }
                   1875:
                   1876: static enum rofferr
1.164     kristaps 1877: roff_tr(ROFF_ARGS)
                   1878: {
                   1879:        const char      *p, *first, *second;
                   1880:        size_t           fsz, ssz;
                   1881:        enum mandoc_esc  esc;
                   1882:
                   1883:        p = *bufp + pos;
                   1884:
                   1885:        if ('\0' == *p) {
                   1886:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1887:                return(ROFF_IGN);
                   1888:        }
                   1889:
                   1890:        while ('\0' != *p) {
                   1891:                fsz = ssz = 1;
                   1892:
                   1893:                first = p++;
                   1894:                if ('\\' == *first) {
                   1895:                        esc = mandoc_escape(&p, NULL, NULL);
                   1896:                        if (ESCAPE_ERROR == esc) {
1.207     schwarze 1897:                                mandoc_msg(MANDOCERR_BADESCAPE,
                   1898:                                    r->parse, ln,
                   1899:                                    (int)(p - *bufp), NULL);
1.164     kristaps 1900:                                return(ROFF_IGN);
                   1901:                        }
                   1902:                        fsz = (size_t)(p - first);
                   1903:                }
                   1904:
                   1905:                second = p++;
                   1906:                if ('\\' == *second) {
                   1907:                        esc = mandoc_escape(&p, NULL, NULL);
                   1908:                        if (ESCAPE_ERROR == esc) {
1.207     schwarze 1909:                                mandoc_msg(MANDOCERR_BADESCAPE,
                   1910:                                    r->parse, ln,
                   1911:                                    (int)(p - *bufp), NULL);
1.164     kristaps 1912:                                return(ROFF_IGN);
                   1913:                        }
                   1914:                        ssz = (size_t)(p - second);
1.165     kristaps 1915:                } else if ('\0' == *second) {
1.207     schwarze 1916:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1917:                            ln, (int)(p - *bufp), NULL);
1.164     kristaps 1918:                        second = " ";
1.165     kristaps 1919:                        p--;
1.164     kristaps 1920:                }
                   1921:
1.167     kristaps 1922:                if (fsz > 1) {
1.207     schwarze 1923:                        roff_setstrn(&r->xmbtab, first, fsz,
                   1924:                            second, ssz, 0);
1.167     kristaps 1925:                        continue;
                   1926:                }
                   1927:
                   1928:                if (NULL == r->xtab)
1.207     schwarze 1929:                        r->xtab = mandoc_calloc(128,
                   1930:                            sizeof(struct roffstr));
1.167     kristaps 1931:
                   1932:                free(r->xtab[(int)*first].p);
                   1933:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1934:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1935:        }
                   1936:
                   1937:        return(ROFF_IGN);
                   1938: }
                   1939:
                   1940: static enum rofferr
1.105     kristaps 1941: roff_so(ROFF_ARGS)
                   1942: {
                   1943:        char *name;
                   1944:
1.210     schwarze 1945:        name = *bufp + pos;
                   1946:        mandoc_vmsg(MANDOCERR_SO, r->parse, ln, ppos, ".so %s", name);
1.105     kristaps 1947:
                   1948:        /*
                   1949:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1950:         * opening anything that's not in our cwd or anything beneath
                   1951:         * it.  Thus, explicitly disallow traversing up the file-system
                   1952:         * or using absolute paths.
                   1953:         */
                   1954:
                   1955:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.210     schwarze 1956:                mandoc_vmsg(MANDOCERR_SO_PATH, r->parse, ln, ppos,
                   1957:                    ".so %s", name);
1.105     kristaps 1958:                return(ROFF_ERR);
                   1959:        }
                   1960:
                   1961:        *offs = pos;
                   1962:        return(ROFF_SO);
                   1963: }
1.92      schwarze 1964:
1.106     kristaps 1965: static enum rofferr
                   1966: roff_userdef(ROFF_ARGS)
1.99      kristaps 1967: {
1.106     kristaps 1968:        const char       *arg[9];
                   1969:        char             *cp, *n1, *n2;
1.119     schwarze 1970:        int               i;
1.106     kristaps 1971:
                   1972:        /*
                   1973:         * Collect pointers to macro argument strings
1.188     schwarze 1974:         * and NUL-terminate them.
1.106     kristaps 1975:         */
                   1976:        cp = *bufp + pos;
1.119     schwarze 1977:        for (i = 0; i < 9; i++)
1.120     schwarze 1978:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 1979:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1980:
1.106     kristaps 1981:        /*
                   1982:         * Expand macro arguments.
1.99      kristaps 1983:         */
1.106     kristaps 1984:        *szp = 0;
                   1985:        n1 = cp = mandoc_strdup(r->current_string);
                   1986:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1987:                i = cp[2] - '1';
                   1988:                if (0 > i || 8 < i) {
                   1989:                        /* Not an argument invocation. */
                   1990:                        cp += 2;
                   1991:                        continue;
                   1992:                }
1.209     schwarze 1993:                *cp = '\0';
                   1994:                *szp = mandoc_asprintf(&n2, "%s%s%s",
                   1995:                    n1, arg[i], cp + 3) + 1;
1.106     kristaps 1996:                cp = n2 + (cp - n1);
                   1997:                free(n1);
                   1998:                n1 = n2;
1.99      kristaps 1999:        }
                   2000:
1.106     kristaps 2001:        /*
                   2002:         * Replace the macro invocation
                   2003:         * by the expanded macro.
                   2004:         */
                   2005:        free(*bufp);
                   2006:        *bufp = n1;
                   2007:        if (0 == *szp)
                   2008:                *szp = strlen(*bufp) + 1;
                   2009:
                   2010:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   2011:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2012: }
1.121     schwarze 2013:
1.212     schwarze 2014: static size_t
1.121     schwarze 2015: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2016: {
                   2017:        char     *name, *cp;
1.212     schwarze 2018:        size_t    namesz;
1.121     schwarze 2019:
                   2020:        name = *cpp;
                   2021:        if ('\0' == *name)
1.212     schwarze 2022:                return(0);
1.121     schwarze 2023:
1.212     schwarze 2024:        /* Read until end of name and terminate it with NUL. */
                   2025:        for (cp = name; 1; cp++) {
                   2026:                if ('\0' == *cp || ' ' == *cp) {
                   2027:                        namesz = cp - name;
                   2028:                        break;
                   2029:                }
1.121     schwarze 2030:                if ('\\' != *cp)
                   2031:                        continue;
1.215     schwarze 2032:                namesz = cp - name;
                   2033:                if ('{' == cp[1] || '}' == cp[1])
                   2034:                        break;
1.121     schwarze 2035:                cp++;
                   2036:                if ('\\' == *cp)
                   2037:                        continue;
1.128     kristaps 2038:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.212     schwarze 2039:                mandoc_escape((const char **)&cp, NULL, NULL);
                   2040:                break;
1.121     schwarze 2041:        }
                   2042:
                   2043:        /* Read past spaces. */
                   2044:        while (' ' == *cp)
                   2045:                cp++;
                   2046:
                   2047:        *cpp = cp;
1.212     schwarze 2048:        return(namesz);
1.121     schwarze 2049: }
                   2050:
1.106     kristaps 2051: /*
                   2052:  * Store *string into the user-defined string called *name.
                   2053:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2054:  * append == 0: replace mode
                   2055:  * append == 1: single-line append mode
                   2056:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2057:  */
1.94      kristaps 2058: static void
1.106     kristaps 2059: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2060:        int append)
1.92      schwarze 2061: {
1.164     kristaps 2062:
                   2063:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.207     schwarze 2064:            string ? strlen(string) : 0, append);
1.164     kristaps 2065: }
                   2066:
                   2067: static void
1.166     kristaps 2068: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2069:                const char *string, size_t stringsz, int append)
1.164     kristaps 2070: {
1.166     kristaps 2071:        struct roffkv   *n;
1.164     kristaps 2072:        char            *c;
                   2073:        int              i;
                   2074:        size_t           oldch, newch;
1.92      schwarze 2075:
1.106     kristaps 2076:        /* Search for an existing string with the same name. */
1.164     kristaps 2077:        n = *r;
                   2078:
1.211     schwarze 2079:        while (n && (namesz != n->key.sz ||
                   2080:                        strncmp(n->key.p, name, namesz)))
1.92      schwarze 2081:                n = n->next;
1.94      kristaps 2082:
                   2083:        if (NULL == n) {
1.106     kristaps 2084:                /* Create a new string table entry. */
1.166     kristaps 2085:                n = mandoc_malloc(sizeof(struct roffkv));
                   2086:                n->key.p = mandoc_strndup(name, namesz);
                   2087:                n->key.sz = namesz;
                   2088:                n->val.p = NULL;
                   2089:                n->val.sz = 0;
1.164     kristaps 2090:                n->next = *r;
                   2091:                *r = n;
1.193     schwarze 2092:        } else if (0 == append) {
1.166     kristaps 2093:                free(n->val.p);
                   2094:                n->val.p = NULL;
                   2095:                n->val.sz = 0;
1.106     kristaps 2096:        }
                   2097:
                   2098:        if (NULL == string)
                   2099:                return;
                   2100:
                   2101:        /*
                   2102:         * One additional byte for the '\n' in multiline mode,
                   2103:         * and one for the terminating '\0'.
                   2104:         */
1.193     schwarze 2105:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2106:
1.166     kristaps 2107:        if (NULL == n->val.p) {
                   2108:                n->val.p = mandoc_malloc(newch);
                   2109:                *n->val.p = '\0';
1.106     kristaps 2110:                oldch = 0;
                   2111:        } else {
1.166     kristaps 2112:                oldch = n->val.sz;
                   2113:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2114:        }
                   2115:
                   2116:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2117:        c = n->val.p + (int)oldch;
1.106     kristaps 2118:
                   2119:        /* Append new content to the destination buffer. */
1.164     kristaps 2120:        i = 0;
                   2121:        while (i < (int)stringsz) {
1.106     kristaps 2122:                /*
                   2123:                 * Rudimentary roff copy mode:
                   2124:                 * Handle escaped backslashes.
                   2125:                 */
1.164     kristaps 2126:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2127:                        i++;
                   2128:                *c++ = string[i++];
1.106     kristaps 2129:        }
1.94      kristaps 2130:
1.106     kristaps 2131:        /* Append terminating bytes. */
1.193     schwarze 2132:        if (1 < append)
1.106     kristaps 2133:                *c++ = '\n';
1.163     kristaps 2134:
1.106     kristaps 2135:        *c = '\0';
1.166     kristaps 2136:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2137: }
                   2138:
1.94      kristaps 2139: static const char *
                   2140: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2141: {
1.166     kristaps 2142:        const struct roffkv *n;
1.191     schwarze 2143:        int i;
1.92      schwarze 2144:
1.164     kristaps 2145:        for (n = r->strtab; n; n = n->next)
1.207     schwarze 2146:                if (0 == strncmp(name, n->key.p, len) &&
                   2147:                    '\0' == n->key.p[(int)len])
1.166     kristaps 2148:                        return(n->val.p);
1.191     schwarze 2149:
                   2150:        for (i = 0; i < PREDEFS_MAX; i++)
                   2151:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2152:                                '\0' == predefs[i].name[(int)len])
                   2153:                        return(predefs[i].str);
1.94      kristaps 2154:
1.157     kristaps 2155:        return(NULL);
1.92      schwarze 2156: }
                   2157:
1.94      kristaps 2158: static void
1.167     kristaps 2159: roff_freestr(struct roffkv *r)
1.92      schwarze 2160: {
1.166     kristaps 2161:        struct roffkv    *n, *nn;
1.92      schwarze 2162:
1.167     kristaps 2163:        for (n = r; n; n = nn) {
1.166     kristaps 2164:                free(n->key.p);
                   2165:                free(n->val.p);
1.92      schwarze 2166:                nn = n->next;
                   2167:                free(n);
                   2168:        }
1.114     kristaps 2169: }
                   2170:
                   2171: const struct tbl_span *
                   2172: roff_span(const struct roff *r)
                   2173: {
1.207     schwarze 2174:
1.114     kristaps 2175:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2176: }
                   2177:
                   2178: const struct eqn *
                   2179: roff_eqn(const struct roff *r)
                   2180: {
1.207     schwarze 2181:
1.125     kristaps 2182:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2183: }
                   2184:
                   2185: /*
                   2186:  * Duplicate an input string, making the appropriate character
                   2187:  * conversations (as stipulated by `tr') along the way.
                   2188:  * Returns a heap-allocated string with all the replacements made.
                   2189:  */
                   2190: char *
                   2191: roff_strdup(const struct roff *r, const char *p)
                   2192: {
1.166     kristaps 2193:        const struct roffkv *cp;
1.164     kristaps 2194:        char            *res;
                   2195:        const char      *pp;
                   2196:        size_t           ssz, sz;
                   2197:        enum mandoc_esc  esc;
                   2198:
1.167     kristaps 2199:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2200:                return(mandoc_strdup(p));
                   2201:        else if ('\0' == *p)
                   2202:                return(mandoc_strdup(""));
                   2203:
                   2204:        /*
                   2205:         * Step through each character looking for term matches
                   2206:         * (remember that a `tr' can be invoked with an escape, which is
                   2207:         * a glyph but the escape is multi-character).
                   2208:         * We only do this if the character hash has been initialised
                   2209:         * and the string is >0 length.
                   2210:         */
                   2211:
                   2212:        res = NULL;
                   2213:        ssz = 0;
                   2214:
                   2215:        while ('\0' != *p) {
1.167     kristaps 2216:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2217:                        sz = r->xtab[(int)*p].sz;
                   2218:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2219:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2220:                        ssz += sz;
                   2221:                        p++;
                   2222:                        continue;
                   2223:                } else if ('\\' != *p) {
                   2224:                        res = mandoc_realloc(res, ssz + 2);
                   2225:                        res[ssz++] = *p++;
                   2226:                        continue;
                   2227:                }
                   2228:
1.164     kristaps 2229:                /* Search for term matches. */
1.167     kristaps 2230:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2231:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2232:                                break;
                   2233:
                   2234:                if (NULL != cp) {
                   2235:                        /*
                   2236:                         * A match has been found.
                   2237:                         * Append the match to the array and move
                   2238:                         * forward by its keysize.
                   2239:                         */
1.207     schwarze 2240:                        res = mandoc_realloc(res,
                   2241:                            ssz + cp->val.sz + 1);
1.166     kristaps 2242:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2243:                        ssz += cp->val.sz;
                   2244:                        p += (int)cp->key.sz;
1.164     kristaps 2245:                        continue;
                   2246:                }
                   2247:
1.167     kristaps 2248:                /*
                   2249:                 * Handle escapes carefully: we need to copy
                   2250:                 * over just the escape itself, or else we might
                   2251:                 * do replacements within the escape itself.
                   2252:                 * Make sure to pass along the bogus string.
                   2253:                 */
                   2254:                pp = p++;
                   2255:                esc = mandoc_escape(&p, NULL, NULL);
                   2256:                if (ESCAPE_ERROR == esc) {
                   2257:                        sz = strlen(pp);
1.164     kristaps 2258:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2259:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2260:                        break;
1.164     kristaps 2261:                }
1.207     schwarze 2262:                /*
                   2263:                 * We bail out on bad escapes.
1.167     kristaps 2264:                 * No need to warn: we already did so when
                   2265:                 * roff_res() was called.
                   2266:                 */
                   2267:                sz = (int)(p - pp);
                   2268:                res = mandoc_realloc(res, ssz + sz + 1);
                   2269:                memcpy(res + ssz, pp, sz);
                   2270:                ssz += sz;
1.164     kristaps 2271:        }
                   2272:
                   2273:        res[(int)ssz] = '\0';
                   2274:        return(res);
1.174     kristaps 2275: }
                   2276:
                   2277: /*
1.207     schwarze 2278:  * Find out whether a line is a macro line or not.
1.174     kristaps 2279:  * If it is, adjust the current position and return one; if it isn't,
                   2280:  * return zero and don't change the current position.
                   2281:  * If the control character has been set with `.cc', then let that grain
                   2282:  * precedence.
                   2283:  * This is slighly contrary to groff, where using the non-breaking
                   2284:  * control character when `cc' has been invoked will cause the
                   2285:  * non-breaking macro contents to be printed verbatim.
                   2286:  */
                   2287: int
                   2288: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2289: {
                   2290:        int             pos;
                   2291:
                   2292:        pos = *ppos;
                   2293:
                   2294:        if (0 != r->control && cp[pos] == r->control)
                   2295:                pos++;
                   2296:        else if (0 != r->control)
                   2297:                return(0);
                   2298:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2299:                pos += 2;
                   2300:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2301:                pos++;
                   2302:        else
                   2303:                return(0);
                   2304:
                   2305:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2306:                pos++;
                   2307:
                   2308:        *ppos = pos;
                   2309:        return(1);
1.74      kristaps 2310: }

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