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Annotation of mandoc/roff.c, Revision 1.191

1.191   ! schwarze    1: /*     $Id: roff.c,v 1.190 2014/01/06 21:34:31 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"
1.109     kristaps   29: #include "libroff.h"
1.94      kristaps   30: #include "libmandoc.h"
1.33      kristaps   31:
1.141     kristaps   32: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   33: #define        RSTACK_MAX      128
                     34:
1.170     schwarze   35: /* Maximum number of string expansions per line, to break infinite loops. */
                     36: #define        EXPAND_LIMIT    1000
                     37:
1.67      kristaps   38: enum   rofft {
1.103     kristaps   39:        ROFF_ad,
1.80      kristaps   40:        ROFF_am,
                     41:        ROFF_ami,
                     42:        ROFF_am1,
1.174     kristaps   43:        ROFF_cc,
1.80      kristaps   44:        ROFF_de,
                     45:        ROFF_dei,
                     46:        ROFF_de1,
1.83      schwarze   47:        ROFF_ds,
1.82      kristaps   48:        ROFF_el,
1.185     schwarze   49:        ROFF_fam,
1.186     schwarze   50:        ROFF_hw,
1.103     kristaps   51:        ROFF_hy,
1.82      kristaps   52:        ROFF_ie,
1.75      kristaps   53:        ROFF_if,
1.76      kristaps   54:        ROFF_ig,
1.123     schwarze   55:        ROFF_it,
1.103     kristaps   56:        ROFF_ne,
                     57:        ROFF_nh,
1.104     kristaps   58:        ROFF_nr,
1.124     schwarze   59:        ROFF_ns,
                     60:        ROFF_ps,
1.83      schwarze   61:        ROFF_rm,
1.105     kristaps   62:        ROFF_so,
1.124     schwarze   63:        ROFF_ta,
1.83      schwarze   64:        ROFF_tr,
1.175     schwarze   65:        ROFF_Dd,
                     66:        ROFF_TH,
1.109     kristaps   67:        ROFF_TS,
                     68:        ROFF_TE,
1.112     kristaps   69:        ROFF_T_,
1.125     kristaps   70:        ROFF_EQ,
                     71:        ROFF_EN,
1.76      kristaps   72:        ROFF_cblock,
1.141     kristaps   73:        ROFF_ccond,
1.106     kristaps   74:        ROFF_USERDEF,
1.67      kristaps   75:        ROFF_MAX
                     76: };
                     77:
1.82      kristaps   78: enum   roffrule {
1.183     schwarze   79:        ROFFRULE_DENY,
                     80:        ROFFRULE_ALLOW
1.82      kristaps   81: };
                     82:
1.147     kristaps   83: /*
1.167     kristaps   84:  * An incredibly-simple string buffer.
                     85:  */
1.94      kristaps   86: struct roffstr {
1.167     kristaps   87:        char            *p; /* nil-terminated buffer */
                     88:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   89: };
                     90:
                     91: /*
1.167     kristaps   92:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps   93:  */
                     94: struct roffkv {
                     95:        struct roffstr   key;
                     96:        struct roffstr   val;
                     97:        struct roffkv   *next; /* next in list */
1.94      kristaps   98: };
                     99:
1.180     schwarze  100: /*
                    101:  * A single number register as part of a singly-linked list.
                    102:  */
                    103: struct roffreg {
                    104:        struct roffstr   key;
1.181     schwarze  105:        int              val;
1.180     schwarze  106:        struct roffreg  *next;
                    107: };
                    108:
1.67      kristaps  109: struct roff {
1.175     schwarze  110:        enum mparset     parsetype; /* requested parse type */
1.128     kristaps  111:        struct mparse   *parse; /* parse point */
1.190     schwarze  112:        int              quick; /* skip standard macro deletion */
1.67      kristaps  113:        struct roffnode *last; /* leaf of stack */
1.82      kristaps  114:        enum roffrule    rstack[RSTACK_MAX]; /* stack of !`ie' rules */
1.174     kristaps  115:        char             control; /* control character */
1.82      kristaps  116:        int              rstackpos; /* position in rstack */
1.180     schwarze  117:        struct roffreg  *regtab; /* number registers */
1.166     kristaps  118:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  119:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    120:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  121:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  122:        struct tbl_node *first_tbl; /* first table parsed */
                    123:        struct tbl_node *last_tbl; /* last table parsed */
                    124:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  125:        struct eqn_node *last_eqn; /* last equation parsed */
                    126:        struct eqn_node *first_eqn; /* first equation parsed */
                    127:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps  128: };
                    129:
1.67      kristaps  130: struct roffnode {
                    131:        enum rofft       tok; /* type of node */
                    132:        struct roffnode *parent; /* up one in stack */
                    133:        int              line; /* parse line */
                    134:        int              col; /* parse col */
1.106     kristaps  135:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  136:        char            *end; /* end-rules: custom token */
                    137:        int              endspan; /* end-rules: next-line or infty */
1.82      kristaps  138:        enum roffrule    rule; /* current evaluation rule */
1.67      kristaps  139: };
                    140:
                    141: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  142:                         enum rofft tok, /* tok of macro */ \
1.67      kristaps  143:                         char **bufp, /* input buffer */ \
                    144:                         size_t *szp, /* size of input buffer */ \
                    145:                         int ln, /* parse line */ \
1.75      kristaps  146:                         int ppos, /* original pos in buffer */ \
                    147:                         int pos, /* current pos in buffer */ \
1.74      kristaps  148:                         int *offs /* reset offset of buffer data */
1.67      kristaps  149:
                    150: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    151:
                    152: struct roffmac {
                    153:        const char      *name; /* macro name */
1.79      kristaps  154:        roffproc         proc; /* process new macro */
                    155:        roffproc         text; /* process as child text of macro */
                    156:        roffproc         sub; /* process as child of macro */
                    157:        int              flags;
                    158: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  159:        struct roffmac  *next;
1.67      kristaps  160: };
                    161:
1.141     kristaps  162: struct predef {
                    163:        const char      *name; /* predefined input name */
                    164:        const char      *str; /* replacement symbol */
                    165: };
                    166:
                    167: #define        PREDEF(__name, __str) \
                    168:        { (__name), (__str) },
                    169:
1.155     kristaps  170: static enum rofft       roffhash_find(const char *, size_t);
                    171: static void             roffhash_init(void);
                    172: static void             roffnode_cleanscope(struct roff *);
                    173: static void             roffnode_pop(struct roff *);
                    174: static void             roffnode_push(struct roff *, enum rofft,
                    175:                                const char *, int, int);
1.80      kristaps  176: static enum rofferr     roff_block(ROFF_ARGS);
                    177: static enum rofferr     roff_block_text(ROFF_ARGS);
                    178: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    179: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  180: static enum rofferr     roff_cc(ROFF_ARGS);
1.80      kristaps  181: static enum rofferr     roff_ccond(ROFF_ARGS);
1.82      kristaps  182: static enum rofferr     roff_cond(ROFF_ARGS);
                    183: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    184: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  185: static enum rofferr     roff_ds(ROFF_ARGS);
1.94      kristaps  186: static enum roffrule    roff_evalcond(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 *);
1.121     schwarze  190: static char            *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);
1.94      kristaps  195: static const char      *roff_getstrn(const struct roff *,
                    196:                                const char *, size_t);
1.178     schwarze  197: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  198: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  199: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  200: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  201:                                int, int, const char *);
1.155     kristaps  202: static enum rofft       roff_parse(struct roff *, const char *, int *);
1.178     schwarze  203: static enum rofferr     roff_parsetext(char **, size_t *, int, int *);
1.172     schwarze  204: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  205:                                char **, size_t *, int, int);
1.122     schwarze  206: static enum rofferr     roff_rm(ROFF_ARGS);
1.94      kristaps  207: static void             roff_setstr(struct roff *,
1.106     kristaps  208:                                const char *, const char *, int);
1.166     kristaps  209: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  210:                                size_t, const char *, size_t, int);
1.105     kristaps  211: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  212: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  213: static enum rofferr     roff_Dd(ROFF_ARGS);
                    214: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  215: static enum rofferr     roff_TE(ROFF_ARGS);
                    216: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  217: static enum rofferr     roff_EQ(ROFF_ARGS);
                    218: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  219: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  220: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  221:
1.155     kristaps  222: /* See roffhash_find() */
1.85      kristaps  223:
                    224: #define        ASCII_HI         126
                    225: #define        ASCII_LO         33
                    226: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    227:
                    228: static struct roffmac  *hash[HASHWIDTH];
                    229:
                    230: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  231:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  232:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    233:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    234:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.174     kristaps  235:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.85      kristaps  236:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    237:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    238:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  239:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  240:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  241:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  242:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  243:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  244:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    245:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    246:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  247:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  248:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    249:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  250:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  251:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    252:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  253:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.105     kristaps  254:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  255:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  256:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  257:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    258:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  259:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    260:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  261:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  262:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    263:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  264:        { ".", roff_cblock, NULL, NULL, 0, NULL },
                    265:        { "\\}", roff_ccond, NULL, NULL, 0, NULL },
1.106     kristaps  266:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  267: };
                    268:
1.175     schwarze  269: const  char *const __mdoc_reserved[] = {
                    270:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    271:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    272:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    273:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
                    274:        "Ds", "Dt", "Dv", "Dx", "D1",
                    275:        "Ec", "Ed", "Ef", "Ek", "El", "Em", "em",
                    276:        "En", "Eo", "Eq", "Er", "Es", "Ev", "Ex",
                    277:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
                    278:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp", "LP",
                    279:        "Me", "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
                    280:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
                    281:        "Pa", "Pc", "Pf", "Po", "Pp", "PP", "pp", "Pq",
                    282:        "Qc", "Ql", "Qo", "Qq", "Or", "Rd", "Re", "Rs", "Rv",
                    283:        "Sc", "Sf", "Sh", "SH", "Sm", "So", "Sq",
                    284:        "Ss", "St", "Sx", "Sy",
                    285:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
                    286:        "%A", "%B", "%D", "%I", "%J", "%N", "%O",
                    287:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    288:        NULL
                    289: };
                    290:
                    291: const  char *const __man_reserved[] = {
                    292:        "AT", "B", "BI", "BR", "BT", "DE", "DS", "DT",
                    293:        "EE", "EN", "EQ", "EX", "HF", "HP", "I", "IB", "IP", "IR",
                    294:        "LP", "ME", "MT", "OP", "P", "PD", "PP", "PT",
                    295:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS", "SY",
                    296:        "TE", "TH", "TP", "TQ", "TS", "T&", "UC", "UE", "UR", "YS",
                    297:        NULL
                    298: };
                    299:
1.141     kristaps  300: /* Array of injected predefined strings. */
                    301: #define        PREDEFS_MAX      38
                    302: static const struct predef predefs[PREDEFS_MAX] = {
                    303: #include "predefs.in"
                    304: };
                    305:
1.155     kristaps  306: /* See roffhash_find() */
1.85      kristaps  307: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    308:
1.178     schwarze  309: static int      roffit_lines;  /* number of lines to delay */
                    310: static char    *roffit_macro;  /* nil-terminated macro line */
                    311:
1.85      kristaps  312: static void
1.155     kristaps  313: roffhash_init(void)
1.85      kristaps  314: {
                    315:        struct roffmac   *n;
                    316:        int               buc, i;
                    317:
1.106     kristaps  318:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  319:                assert(roffs[i].name[0] >= ASCII_LO);
                    320:                assert(roffs[i].name[0] <= ASCII_HI);
                    321:
                    322:                buc = ROFF_HASH(roffs[i].name);
                    323:
                    324:                if (NULL != (n = hash[buc])) {
                    325:                        for ( ; n->next; n = n->next)
                    326:                                /* Do nothing. */ ;
                    327:                        n->next = &roffs[i];
                    328:                } else
                    329:                        hash[buc] = &roffs[i];
                    330:        }
                    331: }
                    332:
1.67      kristaps  333: /*
                    334:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    335:  * the nil-terminated string name could be found.
                    336:  */
                    337: static enum rofft
1.155     kristaps  338: roffhash_find(const char *p, size_t s)
1.67      kristaps  339: {
1.85      kristaps  340:        int              buc;
                    341:        struct roffmac  *n;
1.67      kristaps  342:
1.85      kristaps  343:        /*
                    344:         * libroff has an extremely simple hashtable, for the time
                    345:         * being, which simply keys on the first character, which must
                    346:         * be printable, then walks a chain.  It works well enough until
                    347:         * optimised.
                    348:         */
                    349:
                    350:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    351:                return(ROFF_MAX);
                    352:
                    353:        buc = ROFF_HASH(p);
                    354:
                    355:        if (NULL == (n = hash[buc]))
                    356:                return(ROFF_MAX);
                    357:        for ( ; n; n = n->next)
1.106     kristaps  358:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  359:                        return((enum rofft)(n - roffs));
1.67      kristaps  360:
                    361:        return(ROFF_MAX);
                    362: }
                    363:
                    364:
                    365: /*
                    366:  * Pop the current node off of the stack of roff instructions currently
                    367:  * pending.
                    368:  */
                    369: static void
                    370: roffnode_pop(struct roff *r)
                    371: {
                    372:        struct roffnode *p;
                    373:
1.75      kristaps  374:        assert(r->last);
                    375:        p = r->last;
1.82      kristaps  376:
1.75      kristaps  377:        r->last = r->last->parent;
1.106     kristaps  378:        free(p->name);
                    379:        free(p->end);
1.67      kristaps  380:        free(p);
                    381: }
                    382:
                    383:
                    384: /*
                    385:  * Push a roff node onto the instruction stack.  This must later be
                    386:  * removed with roffnode_pop().
                    387:  */
1.98      schwarze  388: static void
1.106     kristaps  389: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    390:                int line, int col)
1.67      kristaps  391: {
                    392:        struct roffnode *p;
                    393:
1.98      schwarze  394:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  395:        p->tok = tok;
1.106     kristaps  396:        if (name)
                    397:                p->name = mandoc_strdup(name);
1.67      kristaps  398:        p->parent = r->last;
                    399:        p->line = line;
                    400:        p->col = col;
1.79      kristaps  401:        p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67      kristaps  402:
                    403:        r->last = p;
                    404: }
                    405:
                    406:
                    407: static void
                    408: roff_free1(struct roff *r)
                    409: {
1.176     schwarze  410:        struct tbl_node *tbl;
1.125     kristaps  411:        struct eqn_node *e;
1.167     kristaps  412:        int              i;
1.67      kristaps  413:
1.176     schwarze  414:        while (NULL != (tbl = r->first_tbl)) {
                    415:                r->first_tbl = tbl->next;
                    416:                tbl_free(tbl);
1.109     kristaps  417:        }
                    418:
1.113     kristaps  419:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    420:
1.125     kristaps  421:        while (NULL != (e = r->first_eqn)) {
                    422:                r->first_eqn = e->next;
                    423:                eqn_free(e);
                    424:        }
                    425:
                    426:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    427:
1.67      kristaps  428:        while (r->last)
                    429:                roffnode_pop(r);
1.109     kristaps  430:
1.167     kristaps  431:        roff_freestr(r->strtab);
                    432:        roff_freestr(r->xmbtab);
                    433:
                    434:        r->strtab = r->xmbtab = NULL;
                    435:
1.180     schwarze  436:        roff_freereg(r->regtab);
                    437:
                    438:        r->regtab = NULL;
                    439:
1.167     kristaps  440:        if (r->xtab)
                    441:                for (i = 0; i < 128; i++)
                    442:                        free(r->xtab[i].p);
                    443:
                    444:        free(r->xtab);
                    445:        r->xtab = NULL;
1.67      kristaps  446: }
                    447:
                    448: void
                    449: roff_reset(struct roff *r)
                    450: {
                    451:
                    452:        roff_free1(r);
1.174     kristaps  453:        r->control = 0;
1.67      kristaps  454: }
                    455:
                    456:
                    457: void
                    458: roff_free(struct roff *r)
                    459: {
                    460:
                    461:        roff_free1(r);
                    462:        free(r);
                    463: }
                    464:
                    465:
                    466: struct roff *
1.190     schwarze  467: roff_alloc(enum mparset type, struct mparse *parse, int quick)
1.67      kristaps  468: {
                    469:        struct roff     *r;
                    470:
1.98      schwarze  471:        r = mandoc_calloc(1, sizeof(struct roff));
1.175     schwarze  472:        r->parsetype = type;
1.128     kristaps  473:        r->parse = parse;
1.190     schwarze  474:        r->quick = quick;
1.82      kristaps  475:        r->rstackpos = -1;
1.85      kristaps  476:
1.155     kristaps  477:        roffhash_init();
1.141     kristaps  478:
1.67      kristaps  479:        return(r);
                    480: }
                    481:
1.94      kristaps  482: /*
1.181     schwarze  483:  * In the current line, expand user-defined strings ("\*")
                    484:  * and references to number registers ("\n").
                    485:  * Also check the syntax of other escape sequences.
1.154     kristaps  486:  */
1.172     schwarze  487: static enum rofferr
1.142     kristaps  488: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  489: {
1.181     schwarze  490:        char             ubuf[12]; /* buffer to print the number */
1.108     schwarze  491:        const char      *stesc; /* start of an escape sequence ('\\') */
                    492:        const char      *stnam; /* start of the name, after "[(*" */
                    493:        const char      *cp;    /* end of the name, e.g. before ']' */
                    494:        const char      *res;   /* the string to be substituted */
1.181     schwarze  495:        char            *nbuf;  /* new buffer to copy bufp to */
                    496:        size_t           nsz;   /* size of the new buffer */
                    497:        size_t           maxl;  /* expected length of the escape name */
                    498:        size_t           naml;  /* actual length of the escape name */
                    499:        int              expand_count;  /* to avoid infinite loops */
1.94      kristaps  500:
1.170     schwarze  501:        expand_count = 0;
                    502:
1.154     kristaps  503: again:
1.108     schwarze  504:        cp = *bufp + pos;
                    505:        while (NULL != (cp = strchr(cp, '\\'))) {
                    506:                stesc = cp++;
                    507:
                    508:                /*
1.181     schwarze  509:                 * The second character must be an asterisk or an n.
1.108     schwarze  510:                 * If it isn't, skip it anyway:  It is escaped,
                    511:                 * so it can't start another escape sequence.
                    512:                 */
                    513:
                    514:                if ('\0' == *cp)
1.172     schwarze  515:                        return(ROFF_CONT);
1.152     kristaps  516:
1.181     schwarze  517:                switch (*cp) {
                    518:                case ('*'):
                    519:                        res = NULL;
                    520:                        break;
                    521:                case ('n'):
                    522:                        res = ubuf;
                    523:                        break;
                    524:                default:
                    525:                        if (ESCAPE_ERROR != mandoc_escape(&cp, NULL, NULL))
1.152     kristaps  526:                                continue;
1.153     kristaps  527:                        mandoc_msg
                    528:                                (MANDOCERR_BADESCAPE, r->parse,
                    529:                                 ln, (int)(stesc - *bufp), NULL);
1.172     schwarze  530:                        return(ROFF_CONT);
1.152     kristaps  531:                }
                    532:
                    533:                cp++;
1.108     schwarze  534:
                    535:                /*
                    536:                 * The third character decides the length
1.181     schwarze  537:                 * of the name of the string or register.
1.108     schwarze  538:                 * Save a pointer to the name.
                    539:                 */
                    540:
1.94      kristaps  541:                switch (*cp) {
1.108     schwarze  542:                case ('\0'):
1.172     schwarze  543:                        return(ROFF_CONT);
1.94      kristaps  544:                case ('('):
                    545:                        cp++;
                    546:                        maxl = 2;
                    547:                        break;
                    548:                case ('['):
                    549:                        cp++;
                    550:                        maxl = 0;
                    551:                        break;
                    552:                default:
                    553:                        maxl = 1;
                    554:                        break;
                    555:                }
1.108     schwarze  556:                stnam = cp;
1.94      kristaps  557:
1.108     schwarze  558:                /* Advance to the end of the name. */
1.94      kristaps  559:
1.181     schwarze  560:                for (naml = 0; 0 == maxl || naml < maxl; naml++, cp++) {
1.153     kristaps  561:                        if ('\0' == *cp) {
                    562:                                mandoc_msg
                    563:                                        (MANDOCERR_BADESCAPE,
                    564:                                         r->parse, ln,
                    565:                                         (int)(stesc - *bufp), NULL);
1.172     schwarze  566:                                return(ROFF_CONT);
1.153     kristaps  567:                        }
1.94      kristaps  568:                        if (0 == maxl && ']' == *cp)
                    569:                                break;
                    570:                }
                    571:
1.108     schwarze  572:                /*
                    573:                 * Retrieve the replacement string; if it is
                    574:                 * undefined, resume searching for escapes.
                    575:                 */
                    576:
1.181     schwarze  577:                if (NULL == res)
                    578:                        res = roff_getstrn(r, stnam, naml);
                    579:                else
                    580:                        snprintf(ubuf, sizeof(ubuf), "%d",
                    581:                            roff_getregn(r, stnam, naml));
1.94      kristaps  582:
                    583:                if (NULL == res) {
1.153     kristaps  584:                        mandoc_msg
                    585:                                (MANDOCERR_BADESCAPE, r->parse,
                    586:                                 ln, (int)(stesc - *bufp), NULL);
1.142     kristaps  587:                        res = "";
1.94      kristaps  588:                }
                    589:
1.108     schwarze  590:                /* Replace the escape sequence by the string. */
                    591:
1.161     kristaps  592:                pos = stesc - *bufp;
1.154     kristaps  593:
1.94      kristaps  594:                nsz = *szp + strlen(res) + 1;
1.181     schwarze  595:                nbuf = mandoc_malloc(nsz);
1.94      kristaps  596:
1.181     schwarze  597:                strlcpy(nbuf, *bufp, (size_t)(stesc - *bufp + 1));
                    598:                strlcat(nbuf, res, nsz);
                    599:                strlcat(nbuf, cp + (maxl ? 0 : 1), nsz);
1.94      kristaps  600:
                    601:                free(*bufp);
                    602:
1.181     schwarze  603:                *bufp = nbuf;
1.94      kristaps  604:                *szp = nsz;
1.170     schwarze  605:
                    606:                if (EXPAND_LIMIT >= ++expand_count)
                    607:                        goto again;
                    608:
                    609:                /* Just leave the string unexpanded. */
                    610:                mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, ln, pos, NULL);
1.172     schwarze  611:                return(ROFF_IGN);
1.154     kristaps  612:        }
1.172     schwarze  613:        return(ROFF_CONT);
1.154     kristaps  614: }
                    615:
                    616: /*
1.178     schwarze  617:  * Process text streams:
                    618:  * Convert all breakable hyphens into ASCII_HYPH.
                    619:  * Decrement and spring input line trap.
1.154     kristaps  620:  */
                    621: static enum rofferr
1.178     schwarze  622: roff_parsetext(char **bufp, size_t *szp, int pos, int *offs)
1.154     kristaps  623: {
                    624:        size_t           sz;
                    625:        const char      *start;
1.178     schwarze  626:        char            *p;
                    627:        int              isz;
1.154     kristaps  628:        enum mandoc_esc  esc;
                    629:
1.178     schwarze  630:        start = p = *bufp + pos;
1.154     kristaps  631:
                    632:        while ('\0' != *p) {
                    633:                sz = strcspn(p, "-\\");
                    634:                p += sz;
                    635:
1.159     kristaps  636:                if ('\0' == *p)
                    637:                        break;
                    638:
1.154     kristaps  639:                if ('\\' == *p) {
                    640:                        /* Skip over escapes. */
                    641:                        p++;
1.189     schwarze  642:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.154     kristaps  643:                        if (ESCAPE_ERROR == esc)
                    644:                                break;
1.155     kristaps  645:                        continue;
1.159     kristaps  646:                } else if (p == start) {
1.158     kristaps  647:                        p++;
1.155     kristaps  648:                        continue;
1.158     kristaps  649:                }
1.155     kristaps  650:
1.171     schwarze  651:                if (isalpha((unsigned char)p[-1]) &&
                    652:                    isalpha((unsigned char)p[1]))
1.155     kristaps  653:                        *p = ASCII_HYPH;
                    654:                p++;
1.94      kristaps  655:        }
                    656:
1.178     schwarze  657:        /* Spring the input line trap. */
                    658:        if (1 == roffit_lines) {
                    659:                isz = asprintf(&p, "%s\n.%s", *bufp, roffit_macro);
                    660:                if (-1 == isz) {
                    661:                        perror(NULL);
                    662:                        exit((int)MANDOCLEVEL_SYSERR);
                    663:                }
                    664:                free(*bufp);
                    665:                *bufp = p;
                    666:                *szp = isz + 1;
                    667:                *offs = 0;
                    668:                free(roffit_macro);
                    669:                roffit_lines = 0;
                    670:                return(ROFF_REPARSE);
                    671:        } else if (1 < roffit_lines)
                    672:                --roffit_lines;
1.154     kristaps  673:        return(ROFF_CONT);
1.94      kristaps  674: }
                    675:
1.67      kristaps  676: enum rofferr
1.90      kristaps  677: roff_parseln(struct roff *r, int ln, char **bufp,
                    678:                size_t *szp, int pos, int *offs)
1.67      kristaps  679: {
                    680:        enum rofft       t;
1.109     kristaps  681:        enum rofferr     e;
1.130     kristaps  682:        int              ppos, ctl;
1.79      kristaps  683:
                    684:        /*
1.94      kristaps  685:         * Run the reserved-word filter only if we have some reserved
                    686:         * words to fill in.
                    687:         */
                    688:
1.172     schwarze  689:        e = roff_res(r, bufp, szp, ln, pos);
                    690:        if (ROFF_IGN == e)
                    691:                return(e);
                    692:        assert(ROFF_CONT == e);
1.94      kristaps  693:
1.130     kristaps  694:        ppos = pos;
1.174     kristaps  695:        ctl = roff_getcontrol(r, *bufp, &pos);
1.130     kristaps  696:
1.94      kristaps  697:        /*
1.79      kristaps  698:         * First, if a scope is open and we're not a macro, pass the
                    699:         * text through the macro's filter.  If a scope isn't open and
                    700:         * we're not a macro, just let it through.
1.125     kristaps  701:         * Finally, if there's an equation scope open, divert it into it
                    702:         * no matter our state.
1.79      kristaps  703:         */
1.74      kristaps  704:
1.130     kristaps  705:        if (r->last && ! ctl) {
1.78      kristaps  706:                t = r->last->tok;
                    707:                assert(roffs[t].text);
1.109     kristaps  708:                e = (*roffs[t].text)
                    709:                        (r, t, bufp, szp, ln, pos, pos, offs);
                    710:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  711:                if (ROFF_CONT != e)
                    712:                        return(e);
1.182     schwarze  713:        }
                    714:        if (r->eqn)
                    715:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
                    716:        if ( ! ctl) {
1.125     kristaps  717:                if (r->tbl)
1.130     kristaps  718:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.178     schwarze  719:                return(roff_parsetext(bufp, szp, pos, offs));
1.182     schwarze  720:        }
1.67      kristaps  721:
1.79      kristaps  722:        /*
                    723:         * If a scope is open, go to the child handler for that macro,
                    724:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  725:         * Don't do so if an equation is open.
1.79      kristaps  726:         */
1.78      kristaps  727:
1.79      kristaps  728:        if (r->last) {
                    729:                t = r->last->tok;
                    730:                assert(roffs[t].sub);
                    731:                return((*roffs[t].sub)
1.90      kristaps  732:                                (r, t, bufp, szp,
1.130     kristaps  733:                                 ln, ppos, pos, offs));
1.79      kristaps  734:        }
1.78      kristaps  735:
1.79      kristaps  736:        /*
                    737:         * Lastly, as we've no scope open, try to look up and execute
                    738:         * the new macro.  If no macro is found, simply return and let
                    739:         * the compilers handle it.
                    740:         */
1.67      kristaps  741:
1.106     kristaps  742:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79      kristaps  743:                return(ROFF_CONT);
1.67      kristaps  744:
1.75      kristaps  745:        assert(roffs[t].proc);
1.78      kristaps  746:        return((*roffs[t].proc)
1.90      kristaps  747:                        (r, t, bufp, szp,
                    748:                         ln, ppos, pos, offs));
1.74      kristaps  749: }
                    750:
                    751:
1.117     kristaps  752: void
1.74      kristaps  753: roff_endparse(struct roff *r)
                    754: {
                    755:
1.110     kristaps  756:        if (r->last)
1.128     kristaps  757:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.109     kristaps  758:                                r->last->line, r->last->col, NULL);
1.117     kristaps  759:
1.125     kristaps  760:        if (r->eqn) {
1.128     kristaps  761:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.148     kristaps  762:                                r->eqn->eqn.ln, r->eqn->eqn.pos, NULL);
1.151     kristaps  763:                eqn_end(&r->eqn);
1.125     kristaps  764:        }
                    765:
1.117     kristaps  766:        if (r->tbl) {
1.128     kristaps  767:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.117     kristaps  768:                                r->tbl->line, r->tbl->pos, NULL);
1.151     kristaps  769:                tbl_end(&r->tbl);
1.117     kristaps  770:        }
1.67      kristaps  771: }
                    772:
                    773: /*
                    774:  * Parse a roff node's type from the input buffer.  This must be in the
                    775:  * form of ".foo xxx" in the usual way.
                    776:  */
                    777: static enum rofft
1.106     kristaps  778: roff_parse(struct roff *r, const char *buf, int *pos)
1.67      kristaps  779: {
1.106     kristaps  780:        const char      *mac;
                    781:        size_t           maclen;
1.67      kristaps  782:        enum rofft       t;
                    783:
1.144     kristaps  784:        if ('\0' == buf[*pos] || '"' == buf[*pos] ||
                    785:                        '\t' == buf[*pos] || ' ' == buf[*pos])
1.67      kristaps  786:                return(ROFF_MAX);
                    787:
1.144     kristaps  788:        /*
                    789:         * We stop the macro parse at an escape, tab, space, or nil.
                    790:         * However, `\}' is also a valid macro, so make sure we don't
                    791:         * clobber it by seeing the `\' as the end of token.
                    792:         */
                    793:
1.106     kristaps  794:        mac = buf + *pos;
1.144     kristaps  795:        maclen = strcspn(mac + 1, " \\\t\0") + 1;
1.67      kristaps  796:
1.106     kristaps  797:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  798:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  799:
1.127     kristaps  800:        *pos += (int)maclen;
1.130     kristaps  801:
1.67      kristaps  802:        while (buf[*pos] && ' ' == buf[*pos])
                    803:                (*pos)++;
                    804:
                    805:        return(t);
                    806: }
                    807:
                    808: /* ARGSUSED */
                    809: static enum rofferr
1.76      kristaps  810: roff_cblock(ROFF_ARGS)
1.67      kristaps  811: {
                    812:
1.79      kristaps  813:        /*
                    814:         * A block-close `..' should only be invoked as a child of an
                    815:         * ignore macro, otherwise raise a warning and just ignore it.
                    816:         */
                    817:
1.76      kristaps  818:        if (NULL == r->last) {
1.128     kristaps  819:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  820:                return(ROFF_IGN);
                    821:        }
1.67      kristaps  822:
1.81      kristaps  823:        switch (r->last->tok) {
                    824:        case (ROFF_am):
                    825:                /* FALLTHROUGH */
                    826:        case (ROFF_ami):
                    827:                /* FALLTHROUGH */
                    828:        case (ROFF_am1):
                    829:                /* FALLTHROUGH */
                    830:        case (ROFF_de):
1.108     schwarze  831:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  832:                /* FALLTHROUGH */
                    833:        case (ROFF_dei):
                    834:                /* FALLTHROUGH */
                    835:        case (ROFF_ig):
                    836:                break;
                    837:        default:
1.128     kristaps  838:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  839:                return(ROFF_IGN);
1.76      kristaps  840:        }
1.67      kristaps  841:
1.76      kristaps  842:        if ((*bufp)[pos])
1.128     kristaps  843:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.71      kristaps  844:
                    845:        roffnode_pop(r);
1.76      kristaps  846:        roffnode_cleanscope(r);
                    847:        return(ROFF_IGN);
1.71      kristaps  848:
1.67      kristaps  849: }
                    850:
                    851:
1.76      kristaps  852: static void
                    853: roffnode_cleanscope(struct roff *r)
1.67      kristaps  854: {
                    855:
1.76      kristaps  856:        while (r->last) {
1.173     schwarze  857:                if (--r->last->endspan != 0)
1.76      kristaps  858:                        break;
                    859:                roffnode_pop(r);
                    860:        }
1.67      kristaps  861: }
                    862:
                    863:
1.75      kristaps  864: /* ARGSUSED */
1.74      kristaps  865: static enum rofferr
1.75      kristaps  866: roff_ccond(ROFF_ARGS)
1.74      kristaps  867: {
                    868:
1.76      kristaps  869:        if (NULL == r->last) {
1.128     kristaps  870:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  871:                return(ROFF_IGN);
                    872:        }
                    873:
1.82      kristaps  874:        switch (r->last->tok) {
                    875:        case (ROFF_el):
                    876:                /* FALLTHROUGH */
                    877:        case (ROFF_ie):
                    878:                /* FALLTHROUGH */
                    879:        case (ROFF_if):
                    880:                break;
                    881:        default:
1.128     kristaps  882:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.75      kristaps  883:                return(ROFF_IGN);
                    884:        }
                    885:
1.76      kristaps  886:        if (r->last->endspan > -1) {
1.128     kristaps  887:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  888:                return(ROFF_IGN);
                    889:        }
                    890:
                    891:        if ((*bufp)[pos])
1.128     kristaps  892:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.76      kristaps  893:
1.75      kristaps  894:        roffnode_pop(r);
1.76      kristaps  895:        roffnode_cleanscope(r);
                    896:        return(ROFF_IGN);
                    897: }
                    898:
1.75      kristaps  899:
1.76      kristaps  900: /* ARGSUSED */
                    901: static enum rofferr
1.80      kristaps  902: roff_block(ROFF_ARGS)
1.76      kristaps  903: {
1.78      kristaps  904:        int             sv;
                    905:        size_t          sz;
1.106     kristaps  906:        char            *name;
                    907:
                    908:        name = NULL;
1.76      kristaps  909:
1.106     kristaps  910:        if (ROFF_ig != tok) {
                    911:                if ('\0' == (*bufp)[pos]) {
1.128     kristaps  912:                        mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.106     kristaps  913:                        return(ROFF_IGN);
                    914:                }
1.107     kristaps  915:
                    916:                /*
                    917:                 * Re-write `de1', since we don't really care about
                    918:                 * groff's strange compatibility mode, into `de'.
                    919:                 */
                    920:
1.106     kristaps  921:                if (ROFF_de1 == tok)
                    922:                        tok = ROFF_de;
                    923:                if (ROFF_de == tok)
                    924:                        name = *bufp + pos;
                    925:                else
1.128     kristaps  926:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  927:                            roffs[tok].name);
1.107     kristaps  928:
1.131     schwarze  929:                while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.80      kristaps  930:                        pos++;
1.107     kristaps  931:
1.131     schwarze  932:                while (isspace((unsigned char)(*bufp)[pos]))
1.106     kristaps  933:                        (*bufp)[pos++] = '\0';
1.80      kristaps  934:        }
                    935:
1.106     kristaps  936:        roffnode_push(r, tok, name, ln, ppos);
                    937:
                    938:        /*
                    939:         * At the beginning of a `de' macro, clear the existing string
                    940:         * with the same name, if there is one.  New content will be
                    941:         * added from roff_block_text() in multiline mode.
                    942:         */
1.107     kristaps  943:
1.106     kristaps  944:        if (ROFF_de == tok)
1.108     schwarze  945:                roff_setstr(r, name, "", 0);
1.76      kristaps  946:
1.79      kristaps  947:        if ('\0' == (*bufp)[pos])
1.78      kristaps  948:                return(ROFF_IGN);
                    949:
1.107     kristaps  950:        /* If present, process the custom end-of-line marker. */
                    951:
1.78      kristaps  952:        sv = pos;
1.131     schwarze  953:        while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.78      kristaps  954:                pos++;
                    955:
                    956:        /*
                    957:         * Note: groff does NOT like escape characters in the input.
                    958:         * Instead of detecting this, we're just going to let it fly and
                    959:         * to hell with it.
                    960:         */
                    961:
                    962:        assert(pos > sv);
                    963:        sz = (size_t)(pos - sv);
                    964:
1.79      kristaps  965:        if (1 == sz && '.' == (*bufp)[sv])
                    966:                return(ROFF_IGN);
                    967:
1.98      schwarze  968:        r->last->end = mandoc_malloc(sz + 1);
1.78      kristaps  969:
                    970:        memcpy(r->last->end, *bufp + sv, sz);
                    971:        r->last->end[(int)sz] = '\0';
                    972:
1.77      kristaps  973:        if ((*bufp)[pos])
1.128     kristaps  974:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.74      kristaps  975:
1.78      kristaps  976:        return(ROFF_IGN);
                    977: }
                    978:
                    979:
                    980: /* ARGSUSED */
                    981: static enum rofferr
1.80      kristaps  982: roff_block_sub(ROFF_ARGS)
1.79      kristaps  983: {
                    984:        enum rofft      t;
                    985:        int             i, j;
                    986:
                    987:        /*
                    988:         * First check whether a custom macro exists at this level.  If
                    989:         * it does, then check against it.  This is some of groff's
                    990:         * stranger behaviours.  If we encountered a custom end-scope
                    991:         * tag and that tag also happens to be a "real" macro, then we
                    992:         * need to try interpreting it again as a real macro.  If it's
                    993:         * not, then return ignore.  Else continue.
                    994:         */
                    995:
                    996:        if (r->last->end) {
1.130     kristaps  997:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  998:                        if ((*bufp)[i] != r->last->end[j])
                    999:                                break;
                   1000:
                   1001:                if ('\0' == r->last->end[j] &&
                   1002:                                ('\0' == (*bufp)[i] ||
                   1003:                                 ' ' == (*bufp)[i] ||
                   1004:                                 '\t' == (*bufp)[i])) {
                   1005:                        roffnode_pop(r);
                   1006:                        roffnode_cleanscope(r);
                   1007:
1.130     kristaps 1008:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                   1009:                                i++;
                   1010:
                   1011:                        pos = i;
1.106     kristaps 1012:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79      kristaps 1013:                                return(ROFF_RERUN);
                   1014:                        return(ROFF_IGN);
                   1015:                }
                   1016:        }
                   1017:
                   1018:        /*
                   1019:         * If we have no custom end-query or lookup failed, then try
                   1020:         * pulling it out of the hashtable.
                   1021:         */
                   1022:
1.137     schwarze 1023:        t = roff_parse(r, *bufp, &pos);
1.79      kristaps 1024:
1.106     kristaps 1025:        /*
                   1026:         * Macros other than block-end are only significant
                   1027:         * in `de' blocks; elsewhere, simply throw them away.
                   1028:         */
                   1029:        if (ROFF_cblock != t) {
                   1030:                if (ROFF_de == tok)
                   1031:                        roff_setstr(r, r->last->name, *bufp + ppos, 1);
1.79      kristaps 1032:                return(ROFF_IGN);
1.106     kristaps 1033:        }
1.79      kristaps 1034:
                   1035:        assert(roffs[t].proc);
1.90      kristaps 1036:        return((*roffs[t].proc)(r, t, bufp, szp,
                   1037:                                ln, ppos, pos, offs));
1.79      kristaps 1038: }
                   1039:
                   1040:
                   1041: /* ARGSUSED */
                   1042: static enum rofferr
1.80      kristaps 1043: roff_block_text(ROFF_ARGS)
1.78      kristaps 1044: {
                   1045:
1.106     kristaps 1046:        if (ROFF_de == tok)
                   1047:                roff_setstr(r, r->last->name, *bufp + pos, 1);
                   1048:
1.78      kristaps 1049:        return(ROFF_IGN);
                   1050: }
                   1051:
                   1052:
                   1053: /* ARGSUSED */
                   1054: static enum rofferr
1.82      kristaps 1055: roff_cond_sub(ROFF_ARGS)
                   1056: {
                   1057:        enum rofft       t;
                   1058:        enum roffrule    rr;
1.139     kristaps 1059:        char            *ep;
1.82      kristaps 1060:
                   1061:        rr = r->last->rule;
1.139     kristaps 1062:        roffnode_cleanscope(r);
1.177     schwarze 1063:        t = roff_parse(r, *bufp, &pos);
1.82      kristaps 1064:
1.139     kristaps 1065:        /*
1.177     schwarze 1066:         * Fully handle known macros when they are structurally
                   1067:         * required or when the conditional evaluated to true.
1.87      kristaps 1068:         */
                   1069:
1.177     schwarze 1070:        if ((ROFF_MAX != t) &&
                   1071:            (ROFF_ccond == t || ROFFRULE_ALLOW == rr ||
                   1072:             ROFFMAC_STRUCT & roffs[t].flags)) {
                   1073:                assert(roffs[t].proc);
                   1074:                return((*roffs[t].proc)(r, t, bufp, szp,
                   1075:                                        ln, ppos, pos, offs));
                   1076:        }
1.144     kristaps 1077:
1.177     schwarze 1078:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1079:
1.177     schwarze 1080:        ep = &(*bufp)[pos];
                   1081:        while (NULL != (ep = strchr(ep, '\\'))) {
                   1082:                if ('}' != *(++ep))
                   1083:                        continue;
1.82      kristaps 1084:
1.177     schwarze 1085:                /*
                   1086:                 * If we're at the end of line, then just chop
                   1087:                 * off the \} and resize the buffer.
                   1088:                 * If we aren't, then convert it to spaces.
                   1089:                 */
1.139     kristaps 1090:
1.177     schwarze 1091:                if ('\0' == *(ep + 1)) {
                   1092:                        *--ep = '\0';
                   1093:                        *szp -= 2;
                   1094:                } else
                   1095:                        *(ep - 1) = *ep = ' ';
1.82      kristaps 1096:
1.177     schwarze 1097:                roff_ccond(r, ROFF_ccond, bufp, szp,
                   1098:                                ln, pos, pos + 2, offs);
                   1099:                break;
                   1100:        }
                   1101:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.82      kristaps 1102: }
                   1103:
                   1104: /* ARGSUSED */
                   1105: static enum rofferr
                   1106: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1107: {
1.140     kristaps 1108:        char            *ep;
1.82      kristaps 1109:        enum roffrule    rr;
                   1110:
                   1111:        rr = r->last->rule;
1.140     kristaps 1112:        roffnode_cleanscope(r);
1.82      kristaps 1113:
1.140     kristaps 1114:        ep = &(*bufp)[pos];
                   1115:        for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
                   1116:                ep++;
                   1117:                if ('}' != *ep)
                   1118:                        continue;
                   1119:                *ep = '&';
                   1120:                roff_ccond(r, ROFF_ccond, bufp, szp,
                   1121:                                ln, pos, pos + 2, offs);
1.78      kristaps 1122:        }
1.82      kristaps 1123:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74      kristaps 1124: }
                   1125:
1.184     schwarze 1126: static int
                   1127: roff_getnum(const char *v, int *pos, int *res)
                   1128: {
                   1129:        int p, n;
                   1130:
                   1131:        p = *pos;
                   1132:        n = v[p] == '-';
                   1133:        if (n)
                   1134:                p++;
                   1135:
                   1136:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
                   1137:                *res += 10 * *res + v[p] - '0';
                   1138:        if (p == *pos + n)
                   1139:                return 0;
                   1140:
                   1141:        if (n)
                   1142:                *res = -*res;
                   1143:
                   1144:        *pos = p;
                   1145:        return 1;
                   1146: }
                   1147:
                   1148: static int
                   1149: roff_getop(const char *v, int *pos, char *res)
                   1150: {
                   1151:        int e;
                   1152:
                   1153:        *res = v[*pos];
                   1154:        e = v[*pos + 1] == '=';
                   1155:
                   1156:        switch (*res) {
                   1157:        case '=':
                   1158:                break;
                   1159:        case '>':
                   1160:                if (e)
                   1161:                        *res = 'g';
                   1162:                break;
                   1163:        case '<':
                   1164:                if (e)
                   1165:                        *res = 'l';
                   1166:                break;
                   1167:        default:
                   1168:                return(0);
                   1169:        }
                   1170:
                   1171:        *pos += 1 + e;
                   1172:
                   1173:        return(*res);
                   1174: }
                   1175:
1.88      kristaps 1176: static enum roffrule
                   1177: roff_evalcond(const char *v, int *pos)
                   1178: {
1.184     schwarze 1179:        int      not, lh, rh;
                   1180:        char     op;
1.88      kristaps 1181:
                   1182:        switch (v[*pos]) {
                   1183:        case ('n'):
                   1184:                (*pos)++;
                   1185:                return(ROFFRULE_ALLOW);
                   1186:        case ('e'):
                   1187:                /* FALLTHROUGH */
                   1188:        case ('o'):
                   1189:                /* FALLTHROUGH */
                   1190:        case ('t'):
                   1191:                (*pos)++;
                   1192:                return(ROFFRULE_DENY);
1.184     schwarze 1193:        case ('!'):
                   1194:                (*pos)++;
                   1195:                not = 1;
                   1196:                break;
1.88      kristaps 1197:        default:
1.184     schwarze 1198:                not = 0;
1.88      kristaps 1199:                break;
                   1200:        }
                   1201:
1.184     schwarze 1202:        if (!roff_getnum(v, pos, &lh))
                   1203:                return ROFFRULE_DENY;
                   1204:        if (!roff_getop(v, pos, &op)) {
                   1205:                if (lh < 0)
                   1206:                        lh = 0;
                   1207:                goto out;
                   1208:        }
                   1209:        if (!roff_getnum(v, pos, &rh))
                   1210:                return ROFFRULE_DENY;
                   1211:        switch (op) {
                   1212:        case 'g':
                   1213:                lh = lh >= rh;
                   1214:                break;
                   1215:        case 'l':
                   1216:                lh = lh <= rh;
                   1217:                break;
                   1218:        case '=':
                   1219:                lh = lh == rh;
                   1220:                break;
                   1221:        case '>':
                   1222:                lh = lh > rh;
                   1223:                break;
                   1224:        case '<':
                   1225:                lh = lh < rh;
                   1226:                break;
                   1227:        default:
                   1228:                return ROFFRULE_DENY;
                   1229:        }
                   1230: out:
                   1231:        if (not)
                   1232:                lh = !lh;
                   1233:        return lh ? ROFFRULE_ALLOW : ROFFRULE_DENY;
1.88      kristaps 1234: }
                   1235:
1.75      kristaps 1236: /* ARGSUSED */
1.74      kristaps 1237: static enum rofferr
1.103     kristaps 1238: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1239: {
1.123     schwarze 1240:
1.89      kristaps 1241:        return(ROFF_IGN);
                   1242: }
                   1243:
1.104     kristaps 1244: /* ARGSUSED */
                   1245: static enum rofferr
1.82      kristaps 1246: roff_cond(ROFF_ARGS)
1.74      kristaps 1247: {
1.173     schwarze 1248:
                   1249:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1250:
1.134     kristaps 1251:        /*
                   1252:         * An `.el' has no conditional body: it will consume the value
                   1253:         * of the current rstack entry set in prior `ie' calls or
                   1254:         * defaults to DENY.
                   1255:         *
                   1256:         * If we're not an `el', however, then evaluate the conditional.
                   1257:         */
1.133     kristaps 1258:
1.173     schwarze 1259:        r->last->rule = ROFF_el == tok ?
1.134     kristaps 1260:                (r->rstackpos < 0 ?
                   1261:                 ROFFRULE_DENY : r->rstack[r->rstackpos--]) :
                   1262:                roff_evalcond(*bufp, &pos);
1.77      kristaps 1263:
1.134     kristaps 1264:        /*
                   1265:         * An if-else will put the NEGATION of the current evaluated
                   1266:         * conditional into the stack of rules.
                   1267:         */
                   1268:
1.84      schwarze 1269:        if (ROFF_ie == tok) {
1.134     kristaps 1270:                if (r->rstackpos == RSTACK_MAX - 1) {
                   1271:                        mandoc_msg(MANDOCERR_MEM,
                   1272:                                r->parse, ln, ppos, NULL);
                   1273:                        return(ROFF_ERR);
                   1274:                }
                   1275:                r->rstack[++r->rstackpos] =
                   1276:                        ROFFRULE_DENY == r->last->rule ?
                   1277:                        ROFFRULE_ALLOW : ROFFRULE_DENY;
1.82      kristaps 1278:        }
1.88      kristaps 1279:
                   1280:        /* If the parent has false as its rule, then so do we. */
                   1281:
1.109     kristaps 1282:        if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
1.84      schwarze 1283:                r->last->rule = ROFFRULE_DENY;
1.88      kristaps 1284:
                   1285:        /*
1.173     schwarze 1286:         * Determine scope.
                   1287:         * If there is nothing on the line after the conditional,
                   1288:         * not even whitespace, use next-line scope.
1.88      kristaps 1289:         */
1.74      kristaps 1290:
1.173     schwarze 1291:        if ('\0' == (*bufp)[pos]) {
                   1292:                r->last->endspan = 2;
                   1293:                goto out;
                   1294:        }
                   1295:
                   1296:        while (' ' == (*bufp)[pos])
                   1297:                pos++;
                   1298:
                   1299:        /* An opening brace requests multiline scope. */
1.75      kristaps 1300:
                   1301:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1302:                r->last->endspan = -1;
                   1303:                pos += 2;
1.173     schwarze 1304:                goto out;
1.109     kristaps 1305:        }
1.74      kristaps 1306:
1.77      kristaps 1307:        /*
1.173     schwarze 1308:         * Anything else following the conditional causes
                   1309:         * single-line scope.  Warn if the scope contains
                   1310:         * nothing but trailing whitespace.
1.77      kristaps 1311:         */
                   1312:
1.75      kristaps 1313:        if ('\0' == (*bufp)[pos])
1.173     schwarze 1314:                mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.77      kristaps 1315:
1.173     schwarze 1316:        r->last->endspan = 1;
1.74      kristaps 1317:
1.173     schwarze 1318: out:
1.75      kristaps 1319:        *offs = pos;
                   1320:        return(ROFF_RERUN);
1.83      schwarze 1321: }
                   1322:
                   1323:
                   1324: /* ARGSUSED */
                   1325: static enum rofferr
1.92      schwarze 1326: roff_ds(ROFF_ARGS)
                   1327: {
1.96      kristaps 1328:        char            *name, *string;
                   1329:
                   1330:        /*
                   1331:         * A symbol is named by the first word following the macro
                   1332:         * invocation up to a space.  Its value is anything after the
                   1333:         * name's trailing whitespace and optional double-quote.  Thus,
                   1334:         *
                   1335:         *  [.ds foo "bar  "     ]
                   1336:         *
                   1337:         * will have `bar  "     ' as its value.
                   1338:         */
1.92      schwarze 1339:
1.121     schwarze 1340:        string = *bufp + pos;
                   1341:        name = roff_getname(r, &string, ln, pos);
1.92      schwarze 1342:        if ('\0' == *name)
                   1343:                return(ROFF_IGN);
                   1344:
1.121     schwarze 1345:        /* Read past initial double-quote. */
                   1346:        if ('"' == *string)
1.92      schwarze 1347:                string++;
                   1348:
1.96      kristaps 1349:        /* The rest is the value. */
1.106     kristaps 1350:        roff_setstr(r, name, string, 0);
1.92      schwarze 1351:        return(ROFF_IGN);
                   1352: }
                   1353:
1.180     schwarze 1354: void
1.187     schwarze 1355: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1356: {
1.180     schwarze 1357:        struct roffreg  *reg;
                   1358:
                   1359:        /* Search for an existing register with the same name. */
                   1360:        reg = r->regtab;
                   1361:
                   1362:        while (reg && strcmp(name, reg->key.p))
                   1363:                reg = reg->next;
1.147     kristaps 1364:
1.180     schwarze 1365:        if (NULL == reg) {
                   1366:                /* Create a new register. */
                   1367:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1368:                reg->key.p = mandoc_strdup(name);
                   1369:                reg->key.sz = strlen(name);
1.187     schwarze 1370:                reg->val = 0;
1.180     schwarze 1371:                reg->next = r->regtab;
                   1372:                r->regtab = reg;
                   1373:        }
                   1374:
1.187     schwarze 1375:        if ('+' == sign)
                   1376:                reg->val += val;
                   1377:        else if ('-' == sign)
                   1378:                reg->val -= val;
                   1379:        else
                   1380:                reg->val = val;
1.147     kristaps 1381: }
                   1382:
1.181     schwarze 1383: int
1.180     schwarze 1384: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1385: {
1.180     schwarze 1386:        struct roffreg  *reg;
                   1387:
                   1388:        for (reg = r->regtab; reg; reg = reg->next)
                   1389:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1390:                        return(reg->val);
                   1391:
                   1392:        return(0);
                   1393: }
                   1394:
                   1395: static int
                   1396: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1397: {
                   1398:        struct roffreg  *reg;
                   1399:
                   1400:        for (reg = r->regtab; reg; reg = reg->next)
                   1401:                if (len == reg->key.sz &&
                   1402:                    0 == strncmp(name, reg->key.p, len))
                   1403:                        return(reg->val);
1.147     kristaps 1404:
1.180     schwarze 1405:        return(0);
1.147     kristaps 1406: }
                   1407:
1.180     schwarze 1408: static void
                   1409: roff_freereg(struct roffreg *reg)
1.147     kristaps 1410: {
1.180     schwarze 1411:        struct roffreg  *old_reg;
1.147     kristaps 1412:
1.180     schwarze 1413:        while (NULL != reg) {
                   1414:                free(reg->key.p);
                   1415:                old_reg = reg;
                   1416:                reg = reg->next;
                   1417:                free(old_reg);
                   1418:        }
1.147     kristaps 1419: }
1.92      schwarze 1420:
                   1421: /* ARGSUSED */
                   1422: static enum rofferr
1.89      kristaps 1423: roff_nr(ROFF_ARGS)
1.83      schwarze 1424: {
1.121     schwarze 1425:        const char      *key;
                   1426:        char            *val;
1.187     schwarze 1427:        size_t           sz;
1.138     kristaps 1428:        int              iv;
1.187     schwarze 1429:        char             sign;
1.89      kristaps 1430:
1.121     schwarze 1431:        val = *bufp + pos;
                   1432:        key = roff_getname(r, &val, ln, pos);
1.89      kristaps 1433:
1.187     schwarze 1434:        sign = *val;
                   1435:        if ('+' == sign || '-' == sign)
                   1436:                val++;
                   1437:
                   1438:        sz = strspn(val, "0123456789");
                   1439:        iv = sz ? mandoc_strntoi(val, sz, 10) : 0;
1.180     schwarze 1440:
1.187     schwarze 1441:        roff_setreg(r, key, iv, sign);
1.109     kristaps 1442:
1.122     schwarze 1443:        return(ROFF_IGN);
                   1444: }
                   1445:
                   1446: /* ARGSUSED */
                   1447: static enum rofferr
                   1448: roff_rm(ROFF_ARGS)
                   1449: {
                   1450:        const char       *name;
                   1451:        char             *cp;
                   1452:
                   1453:        cp = *bufp + pos;
                   1454:        while ('\0' != *cp) {
1.127     kristaps 1455:                name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
1.122     schwarze 1456:                if ('\0' != *name)
                   1457:                        roff_setstr(r, name, NULL, 0);
                   1458:        }
1.178     schwarze 1459:        return(ROFF_IGN);
                   1460: }
                   1461:
                   1462: /* ARGSUSED */
                   1463: static enum rofferr
                   1464: roff_it(ROFF_ARGS)
                   1465: {
                   1466:        char            *cp;
                   1467:        size_t           len;
                   1468:        int              iv;
                   1469:
                   1470:        /* Parse the number of lines. */
                   1471:        cp = *bufp + pos;
                   1472:        len = strcspn(cp, " \t");
                   1473:        cp[len] = '\0';
                   1474:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
                   1475:                mandoc_msg(MANDOCERR_NUMERIC, r->parse,
                   1476:                                ln, ppos, *bufp + 1);
                   1477:                return(ROFF_IGN);
                   1478:        }
                   1479:        cp += len + 1;
                   1480:
                   1481:        /* Arm the input line trap. */
                   1482:        roffit_lines = iv;
                   1483:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1484:        return(ROFF_IGN);
1.175     schwarze 1485: }
                   1486:
                   1487: /* ARGSUSED */
                   1488: static enum rofferr
                   1489: roff_Dd(ROFF_ARGS)
                   1490: {
                   1491:        const char *const       *cp;
                   1492:
1.190     schwarze 1493:        if (0 == r->quick && MPARSE_MDOC != r->parsetype)
1.175     schwarze 1494:                for (cp = __mdoc_reserved; *cp; cp++)
                   1495:                        roff_setstr(r, *cp, NULL, 0);
                   1496:
                   1497:        return(ROFF_CONT);
                   1498: }
                   1499:
                   1500: /* ARGSUSED */
                   1501: static enum rofferr
                   1502: roff_TH(ROFF_ARGS)
                   1503: {
                   1504:        const char *const       *cp;
                   1505:
1.190     schwarze 1506:        if (0 == r->quick && MPARSE_MDOC != r->parsetype)
1.175     schwarze 1507:                for (cp = __man_reserved; *cp; cp++)
                   1508:                        roff_setstr(r, *cp, NULL, 0);
                   1509:
                   1510:        return(ROFF_CONT);
1.109     kristaps 1511: }
                   1512:
                   1513: /* ARGSUSED */
                   1514: static enum rofferr
                   1515: roff_TE(ROFF_ARGS)
                   1516: {
                   1517:
                   1518:        if (NULL == r->tbl)
1.128     kristaps 1519:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1520:        else
1.151     kristaps 1521:                tbl_end(&r->tbl);
1.109     kristaps 1522:
1.112     kristaps 1523:        return(ROFF_IGN);
                   1524: }
                   1525:
                   1526: /* ARGSUSED */
                   1527: static enum rofferr
                   1528: roff_T_(ROFF_ARGS)
                   1529: {
                   1530:
                   1531:        if (NULL == r->tbl)
1.128     kristaps 1532:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1533:        else
1.116     kristaps 1534:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1535:
1.109     kristaps 1536:        return(ROFF_IGN);
                   1537: }
                   1538:
1.156     kristaps 1539: #if 0
                   1540: static int
1.151     kristaps 1541: roff_closeeqn(struct roff *r)
                   1542: {
                   1543:
                   1544:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1545: }
1.156     kristaps 1546: #endif
1.151     kristaps 1547:
1.156     kristaps 1548: static void
1.151     kristaps 1549: roff_openeqn(struct roff *r, const char *name, int line,
                   1550:                int offs, const char *buf)
1.125     kristaps 1551: {
1.151     kristaps 1552:        struct eqn_node *e;
                   1553:        int              poff;
1.125     kristaps 1554:
                   1555:        assert(NULL == r->eqn);
1.151     kristaps 1556:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1557:
                   1558:        if (r->last_eqn)
                   1559:                r->last_eqn->next = e;
                   1560:        else
                   1561:                r->first_eqn = r->last_eqn = e;
                   1562:
                   1563:        r->eqn = r->last_eqn = e;
1.151     kristaps 1564:
                   1565:        if (buf) {
                   1566:                poff = 0;
                   1567:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1568:        }
                   1569: }
                   1570:
                   1571: /* ARGSUSED */
                   1572: static enum rofferr
                   1573: roff_EQ(ROFF_ARGS)
                   1574: {
                   1575:
                   1576:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1577:        return(ROFF_IGN);
                   1578: }
                   1579:
                   1580: /* ARGSUSED */
                   1581: static enum rofferr
                   1582: roff_EN(ROFF_ARGS)
                   1583: {
                   1584:
1.128     kristaps 1585:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1586:        return(ROFF_IGN);
                   1587: }
                   1588:
                   1589: /* ARGSUSED */
                   1590: static enum rofferr
1.109     kristaps 1591: roff_TS(ROFF_ARGS)
                   1592: {
1.176     schwarze 1593:        struct tbl_node *tbl;
1.89      kristaps 1594:
1.115     kristaps 1595:        if (r->tbl) {
1.128     kristaps 1596:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.151     kristaps 1597:                tbl_end(&r->tbl);
1.115     kristaps 1598:        }
1.83      schwarze 1599:
1.176     schwarze 1600:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1601:
                   1602:        if (r->last_tbl)
1.176     schwarze 1603:                r->last_tbl->next = tbl;
1.113     kristaps 1604:        else
1.176     schwarze 1605:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 1606:
1.176     schwarze 1607:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 1608:        return(ROFF_IGN);
1.92      schwarze 1609: }
                   1610:
1.105     kristaps 1611: /* ARGSUSED */
                   1612: static enum rofferr
1.174     kristaps 1613: roff_cc(ROFF_ARGS)
                   1614: {
                   1615:        const char      *p;
                   1616:
                   1617:        p = *bufp + pos;
                   1618:
                   1619:        if ('\0' == *p || '.' == (r->control = *p++))
                   1620:                r->control = 0;
                   1621:
                   1622:        if ('\0' != *p)
                   1623:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1624:
                   1625:        return(ROFF_IGN);
                   1626: }
                   1627:
                   1628: /* ARGSUSED */
                   1629: static enum rofferr
1.164     kristaps 1630: roff_tr(ROFF_ARGS)
                   1631: {
                   1632:        const char      *p, *first, *second;
                   1633:        size_t           fsz, ssz;
                   1634:        enum mandoc_esc  esc;
                   1635:
                   1636:        p = *bufp + pos;
                   1637:
                   1638:        if ('\0' == *p) {
                   1639:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1640:                return(ROFF_IGN);
                   1641:        }
                   1642:
                   1643:        while ('\0' != *p) {
                   1644:                fsz = ssz = 1;
                   1645:
                   1646:                first = p++;
                   1647:                if ('\\' == *first) {
                   1648:                        esc = mandoc_escape(&p, NULL, NULL);
                   1649:                        if (ESCAPE_ERROR == esc) {
                   1650:                                mandoc_msg
                   1651:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1652:                                         ln, (int)(p - *bufp), NULL);
                   1653:                                return(ROFF_IGN);
                   1654:                        }
                   1655:                        fsz = (size_t)(p - first);
                   1656:                }
                   1657:
                   1658:                second = p++;
                   1659:                if ('\\' == *second) {
                   1660:                        esc = mandoc_escape(&p, NULL, NULL);
                   1661:                        if (ESCAPE_ERROR == esc) {
                   1662:                                mandoc_msg
                   1663:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1664:                                         ln, (int)(p - *bufp), NULL);
                   1665:                                return(ROFF_IGN);
                   1666:                        }
                   1667:                        ssz = (size_t)(p - second);
1.165     kristaps 1668:                } else if ('\0' == *second) {
1.164     kristaps 1669:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1670:                                        ln, (int)(p - *bufp), NULL);
                   1671:                        second = " ";
1.165     kristaps 1672:                        p--;
1.164     kristaps 1673:                }
                   1674:
1.167     kristaps 1675:                if (fsz > 1) {
                   1676:                        roff_setstrn(&r->xmbtab, first,
                   1677:                                        fsz, second, ssz, 0);
                   1678:                        continue;
                   1679:                }
                   1680:
                   1681:                if (NULL == r->xtab)
                   1682:                        r->xtab = mandoc_calloc
                   1683:                                (128, sizeof(struct roffstr));
                   1684:
                   1685:                free(r->xtab[(int)*first].p);
                   1686:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1687:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1688:        }
                   1689:
                   1690:        return(ROFF_IGN);
                   1691: }
                   1692:
                   1693: /* ARGSUSED */
                   1694: static enum rofferr
1.105     kristaps 1695: roff_so(ROFF_ARGS)
                   1696: {
                   1697:        char *name;
                   1698:
1.128     kristaps 1699:        mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
1.105     kristaps 1700:
                   1701:        /*
                   1702:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1703:         * opening anything that's not in our cwd or anything beneath
                   1704:         * it.  Thus, explicitly disallow traversing up the file-system
                   1705:         * or using absolute paths.
                   1706:         */
                   1707:
                   1708:        name = *bufp + pos;
                   1709:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.128     kristaps 1710:                mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
1.105     kristaps 1711:                return(ROFF_ERR);
                   1712:        }
                   1713:
                   1714:        *offs = pos;
                   1715:        return(ROFF_SO);
                   1716: }
1.92      schwarze 1717:
1.106     kristaps 1718: /* ARGSUSED */
                   1719: static enum rofferr
                   1720: roff_userdef(ROFF_ARGS)
1.99      kristaps 1721: {
1.106     kristaps 1722:        const char       *arg[9];
                   1723:        char             *cp, *n1, *n2;
1.119     schwarze 1724:        int               i;
1.106     kristaps 1725:
                   1726:        /*
                   1727:         * Collect pointers to macro argument strings
1.188     schwarze 1728:         * and NUL-terminate them.
1.106     kristaps 1729:         */
                   1730:        cp = *bufp + pos;
1.119     schwarze 1731:        for (i = 0; i < 9; i++)
1.120     schwarze 1732:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 1733:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1734:
1.106     kristaps 1735:        /*
                   1736:         * Expand macro arguments.
1.99      kristaps 1737:         */
1.106     kristaps 1738:        *szp = 0;
                   1739:        n1 = cp = mandoc_strdup(r->current_string);
                   1740:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1741:                i = cp[2] - '1';
                   1742:                if (0 > i || 8 < i) {
                   1743:                        /* Not an argument invocation. */
                   1744:                        cp += 2;
                   1745:                        continue;
                   1746:                }
                   1747:
                   1748:                *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
                   1749:                n2 = mandoc_malloc(*szp);
                   1750:
                   1751:                strlcpy(n2, n1, (size_t)(cp - n1 + 1));
                   1752:                strlcat(n2, arg[i], *szp);
                   1753:                strlcat(n2, cp + 3, *szp);
                   1754:
                   1755:                cp = n2 + (cp - n1);
                   1756:                free(n1);
                   1757:                n1 = n2;
1.99      kristaps 1758:        }
                   1759:
1.106     kristaps 1760:        /*
                   1761:         * Replace the macro invocation
                   1762:         * by the expanded macro.
                   1763:         */
                   1764:        free(*bufp);
                   1765:        *bufp = n1;
                   1766:        if (0 == *szp)
                   1767:                *szp = strlen(*bufp) + 1;
                   1768:
                   1769:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   1770:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 1771: }
1.121     schwarze 1772:
                   1773: static char *
                   1774: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   1775: {
                   1776:        char     *name, *cp;
                   1777:
                   1778:        name = *cpp;
                   1779:        if ('\0' == *name)
                   1780:                return(name);
                   1781:
                   1782:        /* Read until end of name. */
                   1783:        for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
                   1784:                if ('\\' != *cp)
                   1785:                        continue;
                   1786:                cp++;
                   1787:                if ('\\' == *cp)
                   1788:                        continue;
1.128     kristaps 1789:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.121     schwarze 1790:                *cp = '\0';
                   1791:                name = cp;
                   1792:        }
                   1793:
                   1794:        /* Nil-terminate name. */
                   1795:        if ('\0' != *cp)
                   1796:                *(cp++) = '\0';
                   1797:
                   1798:        /* Read past spaces. */
                   1799:        while (' ' == *cp)
                   1800:                cp++;
                   1801:
                   1802:        *cpp = cp;
                   1803:        return(name);
                   1804: }
                   1805:
1.106     kristaps 1806: /*
                   1807:  * Store *string into the user-defined string called *name.
                   1808:  * In multiline mode, append to an existing entry and append '\n';
                   1809:  * else replace the existing entry, if there is one.
                   1810:  * To clear an existing entry, call with (*r, *name, NULL, 0).
                   1811:  */
1.94      kristaps 1812: static void
1.106     kristaps 1813: roff_setstr(struct roff *r, const char *name, const char *string,
                   1814:        int multiline)
1.92      schwarze 1815: {
1.164     kristaps 1816:
                   1817:        roff_setstrn(&r->strtab, name, strlen(name), string,
                   1818:                        string ? strlen(string) : 0, multiline);
                   1819: }
                   1820:
                   1821: static void
1.166     kristaps 1822: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.164     kristaps 1823:                const char *string, size_t stringsz, int multiline)
                   1824: {
1.166     kristaps 1825:        struct roffkv   *n;
1.164     kristaps 1826:        char            *c;
                   1827:        int              i;
                   1828:        size_t           oldch, newch;
1.92      schwarze 1829:
1.106     kristaps 1830:        /* Search for an existing string with the same name. */
1.164     kristaps 1831:        n = *r;
                   1832:
1.166     kristaps 1833:        while (n && strcmp(name, n->key.p))
1.92      schwarze 1834:                n = n->next;
1.94      kristaps 1835:
                   1836:        if (NULL == n) {
1.106     kristaps 1837:                /* Create a new string table entry. */
1.166     kristaps 1838:                n = mandoc_malloc(sizeof(struct roffkv));
                   1839:                n->key.p = mandoc_strndup(name, namesz);
                   1840:                n->key.sz = namesz;
                   1841:                n->val.p = NULL;
                   1842:                n->val.sz = 0;
1.164     kristaps 1843:                n->next = *r;
                   1844:                *r = n;
1.106     kristaps 1845:        } else if (0 == multiline) {
                   1846:                /* In multiline mode, append; else replace. */
1.166     kristaps 1847:                free(n->val.p);
                   1848:                n->val.p = NULL;
                   1849:                n->val.sz = 0;
1.106     kristaps 1850:        }
                   1851:
                   1852:        if (NULL == string)
                   1853:                return;
                   1854:
                   1855:        /*
                   1856:         * One additional byte for the '\n' in multiline mode,
                   1857:         * and one for the terminating '\0'.
                   1858:         */
1.164     kristaps 1859:        newch = stringsz + (multiline ? 2u : 1u);
                   1860:
1.166     kristaps 1861:        if (NULL == n->val.p) {
                   1862:                n->val.p = mandoc_malloc(newch);
                   1863:                *n->val.p = '\0';
1.106     kristaps 1864:                oldch = 0;
                   1865:        } else {
1.166     kristaps 1866:                oldch = n->val.sz;
                   1867:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 1868:        }
                   1869:
                   1870:        /* Skip existing content in the destination buffer. */
1.166     kristaps 1871:        c = n->val.p + (int)oldch;
1.106     kristaps 1872:
                   1873:        /* Append new content to the destination buffer. */
1.164     kristaps 1874:        i = 0;
                   1875:        while (i < (int)stringsz) {
1.106     kristaps 1876:                /*
                   1877:                 * Rudimentary roff copy mode:
                   1878:                 * Handle escaped backslashes.
                   1879:                 */
1.164     kristaps 1880:                if ('\\' == string[i] && '\\' == string[i + 1])
                   1881:                        i++;
                   1882:                *c++ = string[i++];
1.106     kristaps 1883:        }
1.94      kristaps 1884:
1.106     kristaps 1885:        /* Append terminating bytes. */
                   1886:        if (multiline)
                   1887:                *c++ = '\n';
1.163     kristaps 1888:
1.106     kristaps 1889:        *c = '\0';
1.166     kristaps 1890:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 1891: }
                   1892:
1.94      kristaps 1893: static const char *
                   1894: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 1895: {
1.166     kristaps 1896:        const struct roffkv *n;
1.191   ! schwarze 1897:        int i;
1.92      schwarze 1898:
1.164     kristaps 1899:        for (n = r->strtab; n; n = n->next)
1.166     kristaps 1900:                if (0 == strncmp(name, n->key.p, len) &&
                   1901:                                '\0' == n->key.p[(int)len])
                   1902:                        return(n->val.p);
1.191   ! schwarze 1903:
        !          1904:        for (i = 0; i < PREDEFS_MAX; i++)
        !          1905:                if (0 == strncmp(name, predefs[i].name, len) &&
        !          1906:                                '\0' == predefs[i].name[(int)len])
        !          1907:                        return(predefs[i].str);
1.94      kristaps 1908:
1.157     kristaps 1909:        return(NULL);
1.92      schwarze 1910: }
                   1911:
1.94      kristaps 1912: static void
1.167     kristaps 1913: roff_freestr(struct roffkv *r)
1.92      schwarze 1914: {
1.166     kristaps 1915:        struct roffkv    *n, *nn;
1.92      schwarze 1916:
1.167     kristaps 1917:        for (n = r; n; n = nn) {
1.166     kristaps 1918:                free(n->key.p);
                   1919:                free(n->val.p);
1.92      schwarze 1920:                nn = n->next;
                   1921:                free(n);
                   1922:        }
1.114     kristaps 1923: }
                   1924:
                   1925: const struct tbl_span *
                   1926: roff_span(const struct roff *r)
                   1927: {
                   1928:
                   1929:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 1930: }
                   1931:
                   1932: const struct eqn *
                   1933: roff_eqn(const struct roff *r)
                   1934: {
                   1935:
                   1936:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 1937: }
                   1938:
                   1939: /*
                   1940:  * Duplicate an input string, making the appropriate character
                   1941:  * conversations (as stipulated by `tr') along the way.
                   1942:  * Returns a heap-allocated string with all the replacements made.
                   1943:  */
                   1944: char *
                   1945: roff_strdup(const struct roff *r, const char *p)
                   1946: {
1.166     kristaps 1947:        const struct roffkv *cp;
1.164     kristaps 1948:        char            *res;
                   1949:        const char      *pp;
                   1950:        size_t           ssz, sz;
                   1951:        enum mandoc_esc  esc;
                   1952:
1.167     kristaps 1953:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 1954:                return(mandoc_strdup(p));
                   1955:        else if ('\0' == *p)
                   1956:                return(mandoc_strdup(""));
                   1957:
                   1958:        /*
                   1959:         * Step through each character looking for term matches
                   1960:         * (remember that a `tr' can be invoked with an escape, which is
                   1961:         * a glyph but the escape is multi-character).
                   1962:         * We only do this if the character hash has been initialised
                   1963:         * and the string is >0 length.
                   1964:         */
                   1965:
                   1966:        res = NULL;
                   1967:        ssz = 0;
                   1968:
                   1969:        while ('\0' != *p) {
1.167     kristaps 1970:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   1971:                        sz = r->xtab[(int)*p].sz;
                   1972:                        res = mandoc_realloc(res, ssz + sz + 1);
                   1973:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   1974:                        ssz += sz;
                   1975:                        p++;
                   1976:                        continue;
                   1977:                } else if ('\\' != *p) {
                   1978:                        res = mandoc_realloc(res, ssz + 2);
                   1979:                        res[ssz++] = *p++;
                   1980:                        continue;
                   1981:                }
                   1982:
1.164     kristaps 1983:                /* Search for term matches. */
1.167     kristaps 1984:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 1985:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 1986:                                break;
                   1987:
                   1988:                if (NULL != cp) {
                   1989:                        /*
                   1990:                         * A match has been found.
                   1991:                         * Append the match to the array and move
                   1992:                         * forward by its keysize.
                   1993:                         */
1.166     kristaps 1994:                        res = mandoc_realloc
                   1995:                                (res, ssz + cp->val.sz + 1);
                   1996:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   1997:                        ssz += cp->val.sz;
                   1998:                        p += (int)cp->key.sz;
1.164     kristaps 1999:                        continue;
                   2000:                }
                   2001:
1.167     kristaps 2002:                /*
                   2003:                 * Handle escapes carefully: we need to copy
                   2004:                 * over just the escape itself, or else we might
                   2005:                 * do replacements within the escape itself.
                   2006:                 * Make sure to pass along the bogus string.
                   2007:                 */
                   2008:                pp = p++;
                   2009:                esc = mandoc_escape(&p, NULL, NULL);
                   2010:                if (ESCAPE_ERROR == esc) {
                   2011:                        sz = strlen(pp);
1.164     kristaps 2012:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2013:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2014:                        break;
1.164     kristaps 2015:                }
1.167     kristaps 2016:                /*
                   2017:                 * We bail out on bad escapes.
                   2018:                 * No need to warn: we already did so when
                   2019:                 * roff_res() was called.
                   2020:                 */
                   2021:                sz = (int)(p - pp);
                   2022:                res = mandoc_realloc(res, ssz + sz + 1);
                   2023:                memcpy(res + ssz, pp, sz);
                   2024:                ssz += sz;
1.164     kristaps 2025:        }
                   2026:
                   2027:        res[(int)ssz] = '\0';
                   2028:        return(res);
1.174     kristaps 2029: }
                   2030:
                   2031: /*
                   2032:  * Find out whether a line is a macro line or not.
                   2033:  * If it is, adjust the current position and return one; if it isn't,
                   2034:  * return zero and don't change the current position.
                   2035:  * If the control character has been set with `.cc', then let that grain
                   2036:  * precedence.
                   2037:  * This is slighly contrary to groff, where using the non-breaking
                   2038:  * control character when `cc' has been invoked will cause the
                   2039:  * non-breaking macro contents to be printed verbatim.
                   2040:  */
                   2041: int
                   2042: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2043: {
                   2044:        int             pos;
                   2045:
                   2046:        pos = *ppos;
                   2047:
                   2048:        if (0 != r->control && cp[pos] == r->control)
                   2049:                pos++;
                   2050:        else if (0 != r->control)
                   2051:                return(0);
                   2052:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2053:                pos += 2;
                   2054:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2055:                pos++;
                   2056:        else
                   2057:                return(0);
                   2058:
                   2059:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2060:                pos++;
                   2061:
                   2062:        *ppos = pos;
                   2063:        return(1);
1.74      kristaps 2064: }

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