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Annotation of mandoc/roff.c, Revision 1.177

1.177   ! schwarze    1: /*     $Id: roff.c,v 1.176 2013/05/31 22:08:09 schwarze Exp $ */
1.1       kristaps    2: /*
1.175     schwarze    3:  * Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
1.177   ! schwarze    4:  * Copyright (c) 2010, 2011, 2012, 2013 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>
1.1       kristaps   24: #include <stdlib.h>
1.67      kristaps   25: #include <string.h>
1.1       kristaps   26:
1.67      kristaps   27: #include "mandoc.h"
1.109     kristaps   28: #include "libroff.h"
1.94      kristaps   29: #include "libmandoc.h"
1.33      kristaps   30:
1.141     kristaps   31: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   32: #define        RSTACK_MAX      128
                     33:
1.170     schwarze   34: /* Maximum number of string expansions per line, to break infinite loops. */
                     35: #define        EXPAND_LIMIT    1000
                     36:
1.67      kristaps   37: enum   rofft {
1.103     kristaps   38:        ROFF_ad,
1.80      kristaps   39:        ROFF_am,
                     40:        ROFF_ami,
                     41:        ROFF_am1,
1.174     kristaps   42:        ROFF_cc,
1.80      kristaps   43:        ROFF_de,
                     44:        ROFF_dei,
                     45:        ROFF_de1,
1.83      schwarze   46:        ROFF_ds,
1.82      kristaps   47:        ROFF_el,
1.103     kristaps   48:        ROFF_hy,
1.82      kristaps   49:        ROFF_ie,
1.75      kristaps   50:        ROFF_if,
1.76      kristaps   51:        ROFF_ig,
1.123     schwarze   52:        ROFF_it,
1.103     kristaps   53:        ROFF_ne,
                     54:        ROFF_nh,
1.104     kristaps   55:        ROFF_nr,
1.124     schwarze   56:        ROFF_ns,
                     57:        ROFF_ps,
1.83      schwarze   58:        ROFF_rm,
1.105     kristaps   59:        ROFF_so,
1.124     schwarze   60:        ROFF_ta,
1.83      schwarze   61:        ROFF_tr,
1.175     schwarze   62:        ROFF_Dd,
                     63:        ROFF_TH,
1.109     kristaps   64:        ROFF_TS,
                     65:        ROFF_TE,
1.112     kristaps   66:        ROFF_T_,
1.125     kristaps   67:        ROFF_EQ,
                     68:        ROFF_EN,
1.76      kristaps   69:        ROFF_cblock,
1.141     kristaps   70:        ROFF_ccond,
1.106     kristaps   71:        ROFF_USERDEF,
1.67      kristaps   72:        ROFF_MAX
                     73: };
                     74:
1.82      kristaps   75: enum   roffrule {
                     76:        ROFFRULE_ALLOW,
                     77:        ROFFRULE_DENY
                     78: };
                     79:
1.147     kristaps   80: /*
                     81:  * A single register entity.  If "set" is zero, the value of the
                     82:  * register should be the default one, which is per-register.
                     83:  * Registers are assumed to be unsigned ints for now.
                     84:  */
                     85: struct reg {
1.166     kristaps   86:        int              set; /* whether set or not */
                     87:        unsigned int     u; /* unsigned integer */
1.147     kristaps   88: };
                     89:
1.167     kristaps   90: /*
                     91:  * An incredibly-simple string buffer.
                     92:  */
1.94      kristaps   93: struct roffstr {
1.167     kristaps   94:        char            *p; /* nil-terminated buffer */
                     95:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   96: };
                     97:
                     98: /*
1.167     kristaps   99:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps  100:  */
                    101: struct roffkv {
                    102:        struct roffstr   key;
                    103:        struct roffstr   val;
                    104:        struct roffkv   *next; /* next in list */
1.94      kristaps  105: };
                    106:
1.67      kristaps  107: struct roff {
1.175     schwarze  108:        enum mparset     parsetype; /* requested parse type */
1.128     kristaps  109:        struct mparse   *parse; /* parse point */
1.67      kristaps  110:        struct roffnode *last; /* leaf of stack */
1.82      kristaps  111:        enum roffrule    rstack[RSTACK_MAX]; /* stack of !`ie' rules */
1.174     kristaps  112:        char             control; /* control character */
1.82      kristaps  113:        int              rstackpos; /* position in rstack */
1.147     kristaps  114:        struct reg       regs[REG__MAX];
1.166     kristaps  115:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  116:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    117:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  118:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  119:        struct tbl_node *first_tbl; /* first table parsed */
                    120:        struct tbl_node *last_tbl; /* last table parsed */
                    121:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  122:        struct eqn_node *last_eqn; /* last equation parsed */
                    123:        struct eqn_node *first_eqn; /* first equation parsed */
                    124:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps  125: };
                    126:
1.67      kristaps  127: struct roffnode {
                    128:        enum rofft       tok; /* type of node */
                    129:        struct roffnode *parent; /* up one in stack */
                    130:        int              line; /* parse line */
                    131:        int              col; /* parse col */
1.106     kristaps  132:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  133:        char            *end; /* end-rules: custom token */
                    134:        int              endspan; /* end-rules: next-line or infty */
1.82      kristaps  135:        enum roffrule    rule; /* current evaluation rule */
1.67      kristaps  136: };
                    137:
                    138: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  139:                         enum rofft tok, /* tok of macro */ \
1.67      kristaps  140:                         char **bufp, /* input buffer */ \
                    141:                         size_t *szp, /* size of input buffer */ \
                    142:                         int ln, /* parse line */ \
1.75      kristaps  143:                         int ppos, /* original pos in buffer */ \
                    144:                         int pos, /* current pos in buffer */ \
1.74      kristaps  145:                         int *offs /* reset offset of buffer data */
1.67      kristaps  146:
                    147: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    148:
                    149: struct roffmac {
                    150:        const char      *name; /* macro name */
1.79      kristaps  151:        roffproc         proc; /* process new macro */
                    152:        roffproc         text; /* process as child text of macro */
                    153:        roffproc         sub; /* process as child of macro */
                    154:        int              flags;
                    155: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  156:        struct roffmac  *next;
1.67      kristaps  157: };
                    158:
1.141     kristaps  159: struct predef {
                    160:        const char      *name; /* predefined input name */
                    161:        const char      *str; /* replacement symbol */
                    162: };
                    163:
                    164: #define        PREDEF(__name, __str) \
                    165:        { (__name), (__str) },
                    166:
1.155     kristaps  167: static enum rofft       roffhash_find(const char *, size_t);
                    168: static void             roffhash_init(void);
                    169: static void             roffnode_cleanscope(struct roff *);
                    170: static void             roffnode_pop(struct roff *);
                    171: static void             roffnode_push(struct roff *, enum rofft,
                    172:                                const char *, int, int);
1.80      kristaps  173: static enum rofferr     roff_block(ROFF_ARGS);
                    174: static enum rofferr     roff_block_text(ROFF_ARGS);
                    175: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    176: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  177: static enum rofferr     roff_cc(ROFF_ARGS);
1.80      kristaps  178: static enum rofferr     roff_ccond(ROFF_ARGS);
1.82      kristaps  179: static enum rofferr     roff_cond(ROFF_ARGS);
                    180: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    181: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  182: static enum rofferr     roff_ds(ROFF_ARGS);
1.94      kristaps  183: static enum roffrule    roff_evalcond(const char *, int *);
1.155     kristaps  184: static void             roff_free1(struct roff *);
1.167     kristaps  185: static void             roff_freestr(struct roffkv *);
1.121     schwarze  186: static char            *roff_getname(struct roff *, char **, int, int);
1.94      kristaps  187: static const char      *roff_getstrn(const struct roff *,
                    188:                                const char *, size_t);
1.103     kristaps  189: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  190: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  191: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  192:                                int, int, const char *);
1.155     kristaps  193: static enum rofft       roff_parse(struct roff *, const char *, int *);
                    194: static enum rofferr     roff_parsetext(char *);
1.172     schwarze  195: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  196:                                char **, size_t *, int, int);
1.122     schwarze  197: static enum rofferr     roff_rm(ROFF_ARGS);
1.94      kristaps  198: static void             roff_setstr(struct roff *,
1.106     kristaps  199:                                const char *, const char *, int);
1.166     kristaps  200: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  201:                                size_t, const char *, size_t, int);
1.105     kristaps  202: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  203: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  204: static enum rofferr     roff_Dd(ROFF_ARGS);
                    205: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  206: static enum rofferr     roff_TE(ROFF_ARGS);
                    207: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  208: static enum rofferr     roff_EQ(ROFF_ARGS);
                    209: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  210: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  211: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  212:
1.155     kristaps  213: /* See roffhash_find() */
1.85      kristaps  214:
                    215: #define        ASCII_HI         126
                    216: #define        ASCII_LO         33
                    217: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    218:
                    219: static struct roffmac  *hash[HASHWIDTH];
                    220:
                    221: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  222:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  223:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    224:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    225:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.174     kristaps  226:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.85      kristaps  227:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    228:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    229:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  230:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  231:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.103     kristaps  232:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  233:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    234:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    235:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.123     schwarze  236:        { "it", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  237:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    238:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  239:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  240:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    241:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  242:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.105     kristaps  243:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  244:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  245:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  246:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    247:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  248:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    249:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  250:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  251:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    252:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  253:        { ".", roff_cblock, NULL, NULL, 0, NULL },
                    254:        { "\\}", roff_ccond, NULL, NULL, 0, NULL },
1.106     kristaps  255:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  256: };
                    257:
1.175     schwarze  258: const  char *const __mdoc_reserved[] = {
                    259:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    260:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    261:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    262:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
                    263:        "Ds", "Dt", "Dv", "Dx", "D1",
                    264:        "Ec", "Ed", "Ef", "Ek", "El", "Em", "em",
                    265:        "En", "Eo", "Eq", "Er", "Es", "Ev", "Ex",
                    266:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
                    267:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp", "LP",
                    268:        "Me", "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
                    269:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
                    270:        "Pa", "Pc", "Pf", "Po", "Pp", "PP", "pp", "Pq",
                    271:        "Qc", "Ql", "Qo", "Qq", "Or", "Rd", "Re", "Rs", "Rv",
                    272:        "Sc", "Sf", "Sh", "SH", "Sm", "So", "Sq",
                    273:        "Ss", "St", "Sx", "Sy",
                    274:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
                    275:        "%A", "%B", "%D", "%I", "%J", "%N", "%O",
                    276:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    277:        NULL
                    278: };
                    279:
                    280: const  char *const __man_reserved[] = {
                    281:        "AT", "B", "BI", "BR", "BT", "DE", "DS", "DT",
                    282:        "EE", "EN", "EQ", "EX", "HF", "HP", "I", "IB", "IP", "IR",
                    283:        "LP", "ME", "MT", "OP", "P", "PD", "PP", "PT",
                    284:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS", "SY",
                    285:        "TE", "TH", "TP", "TQ", "TS", "T&", "UC", "UE", "UR", "YS",
                    286:        NULL
                    287: };
                    288:
1.141     kristaps  289: /* Array of injected predefined strings. */
                    290: #define        PREDEFS_MAX      38
                    291: static const struct predef predefs[PREDEFS_MAX] = {
                    292: #include "predefs.in"
                    293: };
                    294:
1.155     kristaps  295: /* See roffhash_find() */
1.85      kristaps  296: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    297:
                    298: static void
1.155     kristaps  299: roffhash_init(void)
1.85      kristaps  300: {
                    301:        struct roffmac   *n;
                    302:        int               buc, i;
                    303:
1.106     kristaps  304:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  305:                assert(roffs[i].name[0] >= ASCII_LO);
                    306:                assert(roffs[i].name[0] <= ASCII_HI);
                    307:
                    308:                buc = ROFF_HASH(roffs[i].name);
                    309:
                    310:                if (NULL != (n = hash[buc])) {
                    311:                        for ( ; n->next; n = n->next)
                    312:                                /* Do nothing. */ ;
                    313:                        n->next = &roffs[i];
                    314:                } else
                    315:                        hash[buc] = &roffs[i];
                    316:        }
                    317: }
                    318:
1.67      kristaps  319: /*
                    320:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    321:  * the nil-terminated string name could be found.
                    322:  */
                    323: static enum rofft
1.155     kristaps  324: roffhash_find(const char *p, size_t s)
1.67      kristaps  325: {
1.85      kristaps  326:        int              buc;
                    327:        struct roffmac  *n;
1.67      kristaps  328:
1.85      kristaps  329:        /*
                    330:         * libroff has an extremely simple hashtable, for the time
                    331:         * being, which simply keys on the first character, which must
                    332:         * be printable, then walks a chain.  It works well enough until
                    333:         * optimised.
                    334:         */
                    335:
                    336:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    337:                return(ROFF_MAX);
                    338:
                    339:        buc = ROFF_HASH(p);
                    340:
                    341:        if (NULL == (n = hash[buc]))
                    342:                return(ROFF_MAX);
                    343:        for ( ; n; n = n->next)
1.106     kristaps  344:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  345:                        return((enum rofft)(n - roffs));
1.67      kristaps  346:
                    347:        return(ROFF_MAX);
                    348: }
                    349:
                    350:
                    351: /*
                    352:  * Pop the current node off of the stack of roff instructions currently
                    353:  * pending.
                    354:  */
                    355: static void
                    356: roffnode_pop(struct roff *r)
                    357: {
                    358:        struct roffnode *p;
                    359:
1.75      kristaps  360:        assert(r->last);
                    361:        p = r->last;
1.82      kristaps  362:
1.75      kristaps  363:        r->last = r->last->parent;
1.106     kristaps  364:        free(p->name);
                    365:        free(p->end);
1.67      kristaps  366:        free(p);
                    367: }
                    368:
                    369:
                    370: /*
                    371:  * Push a roff node onto the instruction stack.  This must later be
                    372:  * removed with roffnode_pop().
                    373:  */
1.98      schwarze  374: static void
1.106     kristaps  375: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    376:                int line, int col)
1.67      kristaps  377: {
                    378:        struct roffnode *p;
                    379:
1.98      schwarze  380:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  381:        p->tok = tok;
1.106     kristaps  382:        if (name)
                    383:                p->name = mandoc_strdup(name);
1.67      kristaps  384:        p->parent = r->last;
                    385:        p->line = line;
                    386:        p->col = col;
1.79      kristaps  387:        p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67      kristaps  388:
                    389:        r->last = p;
                    390: }
                    391:
                    392:
                    393: static void
                    394: roff_free1(struct roff *r)
                    395: {
1.176     schwarze  396:        struct tbl_node *tbl;
1.125     kristaps  397:        struct eqn_node *e;
1.167     kristaps  398:        int              i;
1.67      kristaps  399:
1.176     schwarze  400:        while (NULL != (tbl = r->first_tbl)) {
                    401:                r->first_tbl = tbl->next;
                    402:                tbl_free(tbl);
1.109     kristaps  403:        }
                    404:
1.113     kristaps  405:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    406:
1.125     kristaps  407:        while (NULL != (e = r->first_eqn)) {
                    408:                r->first_eqn = e->next;
                    409:                eqn_free(e);
                    410:        }
                    411:
                    412:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    413:
1.67      kristaps  414:        while (r->last)
                    415:                roffnode_pop(r);
1.109     kristaps  416:
1.167     kristaps  417:        roff_freestr(r->strtab);
                    418:        roff_freestr(r->xmbtab);
                    419:
                    420:        r->strtab = r->xmbtab = NULL;
                    421:
                    422:        if (r->xtab)
                    423:                for (i = 0; i < 128; i++)
                    424:                        free(r->xtab[i].p);
                    425:
                    426:        free(r->xtab);
                    427:        r->xtab = NULL;
1.67      kristaps  428: }
                    429:
                    430: void
                    431: roff_reset(struct roff *r)
                    432: {
1.143     kristaps  433:        int              i;
1.67      kristaps  434:
                    435:        roff_free1(r);
1.143     kristaps  436:
1.174     kristaps  437:        r->control = 0;
1.147     kristaps  438:        memset(&r->regs, 0, sizeof(struct reg) * REG__MAX);
                    439:
1.143     kristaps  440:        for (i = 0; i < PREDEFS_MAX; i++)
                    441:                roff_setstr(r, predefs[i].name, predefs[i].str, 0);
1.67      kristaps  442: }
                    443:
                    444:
                    445: void
                    446: roff_free(struct roff *r)
                    447: {
                    448:
                    449:        roff_free1(r);
                    450:        free(r);
                    451: }
                    452:
                    453:
                    454: struct roff *
1.175     schwarze  455: roff_alloc(enum mparset type, struct mparse *parse)
1.67      kristaps  456: {
                    457:        struct roff     *r;
1.141     kristaps  458:        int              i;
1.67      kristaps  459:
1.98      schwarze  460:        r = mandoc_calloc(1, sizeof(struct roff));
1.175     schwarze  461:        r->parsetype = type;
1.128     kristaps  462:        r->parse = parse;
1.82      kristaps  463:        r->rstackpos = -1;
1.85      kristaps  464:
1.155     kristaps  465:        roffhash_init();
1.141     kristaps  466:
                    467:        for (i = 0; i < PREDEFS_MAX; i++)
                    468:                roff_setstr(r, predefs[i].name, predefs[i].str, 0);
                    469:
1.67      kristaps  470:        return(r);
                    471: }
                    472:
1.94      kristaps  473: /*
                    474:  * Pre-filter each and every line for reserved words (one beginning with
                    475:  * `\*', e.g., `\*(ab').  These must be handled before the actual line
                    476:  * is processed.
1.153     kristaps  477:  * This also checks the syntax of regular escapes.
1.154     kristaps  478:  */
1.172     schwarze  479: static enum rofferr
1.142     kristaps  480: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  481: {
1.152     kristaps  482:        enum mandoc_esc  esc;
1.108     schwarze  483:        const char      *stesc; /* start of an escape sequence ('\\') */
                    484:        const char      *stnam; /* start of the name, after "[(*" */
                    485:        const char      *cp;    /* end of the name, e.g. before ']' */
                    486:        const char      *res;   /* the string to be substituted */
1.170     schwarze  487:        int              i, maxl, expand_count;
1.94      kristaps  488:        size_t           nsz;
                    489:        char            *n;
                    490:
1.170     schwarze  491:        expand_count = 0;
                    492:
1.154     kristaps  493: again:
1.108     schwarze  494:        cp = *bufp + pos;
                    495:        while (NULL != (cp = strchr(cp, '\\'))) {
                    496:                stesc = cp++;
                    497:
                    498:                /*
                    499:                 * The second character must be an asterisk.
                    500:                 * If it isn't, skip it anyway:  It is escaped,
                    501:                 * so it can't start another escape sequence.
                    502:                 */
                    503:
                    504:                if ('\0' == *cp)
1.172     schwarze  505:                        return(ROFF_CONT);
1.152     kristaps  506:
                    507:                if ('*' != *cp) {
                    508:                        res = cp;
                    509:                        esc = mandoc_escape(&cp, NULL, NULL);
                    510:                        if (ESCAPE_ERROR != esc)
                    511:                                continue;
                    512:                        cp = res;
1.153     kristaps  513:                        mandoc_msg
                    514:                                (MANDOCERR_BADESCAPE, r->parse,
                    515:                                 ln, (int)(stesc - *bufp), NULL);
1.172     schwarze  516:                        return(ROFF_CONT);
1.152     kristaps  517:                }
                    518:
                    519:                cp++;
1.108     schwarze  520:
                    521:                /*
                    522:                 * The third character decides the length
                    523:                 * of the name of the string.
                    524:                 * Save a pointer to the name.
                    525:                 */
                    526:
1.94      kristaps  527:                switch (*cp) {
1.108     schwarze  528:                case ('\0'):
1.172     schwarze  529:                        return(ROFF_CONT);
1.94      kristaps  530:                case ('('):
                    531:                        cp++;
                    532:                        maxl = 2;
                    533:                        break;
                    534:                case ('['):
                    535:                        cp++;
                    536:                        maxl = 0;
                    537:                        break;
                    538:                default:
                    539:                        maxl = 1;
                    540:                        break;
                    541:                }
1.108     schwarze  542:                stnam = cp;
1.94      kristaps  543:
1.108     schwarze  544:                /* Advance to the end of the name. */
1.94      kristaps  545:
                    546:                for (i = 0; 0 == maxl || i < maxl; i++, cp++) {
1.153     kristaps  547:                        if ('\0' == *cp) {
                    548:                                mandoc_msg
                    549:                                        (MANDOCERR_BADESCAPE,
                    550:                                         r->parse, ln,
                    551:                                         (int)(stesc - *bufp), NULL);
1.172     schwarze  552:                                return(ROFF_CONT);
1.153     kristaps  553:                        }
1.94      kristaps  554:                        if (0 == maxl && ']' == *cp)
                    555:                                break;
                    556:                }
                    557:
1.108     schwarze  558:                /*
                    559:                 * Retrieve the replacement string; if it is
                    560:                 * undefined, resume searching for escapes.
                    561:                 */
                    562:
                    563:                res = roff_getstrn(r, stnam, (size_t)i);
1.94      kristaps  564:
                    565:                if (NULL == res) {
1.153     kristaps  566:                        mandoc_msg
                    567:                                (MANDOCERR_BADESCAPE, r->parse,
                    568:                                 ln, (int)(stesc - *bufp), NULL);
1.142     kristaps  569:                        res = "";
1.94      kristaps  570:                }
                    571:
1.108     schwarze  572:                /* Replace the escape sequence by the string. */
                    573:
1.161     kristaps  574:                pos = stesc - *bufp;
1.154     kristaps  575:
1.94      kristaps  576:                nsz = *szp + strlen(res) + 1;
                    577:                n = mandoc_malloc(nsz);
                    578:
1.108     schwarze  579:                strlcpy(n, *bufp, (size_t)(stesc - *bufp + 1));
1.94      kristaps  580:                strlcat(n, res, nsz);
                    581:                strlcat(n, cp + (maxl ? 0 : 1), nsz);
                    582:
                    583:                free(*bufp);
                    584:
                    585:                *bufp = n;
                    586:                *szp = nsz;
1.170     schwarze  587:
                    588:                if (EXPAND_LIMIT >= ++expand_count)
                    589:                        goto again;
                    590:
                    591:                /* Just leave the string unexpanded. */
                    592:                mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, ln, pos, NULL);
1.172     schwarze  593:                return(ROFF_IGN);
1.154     kristaps  594:        }
1.172     schwarze  595:        return(ROFF_CONT);
1.154     kristaps  596: }
                    597:
                    598: /*
                    599:  * Process text streams: convert all breakable hyphens into ASCII_HYPH.
                    600:  */
                    601: static enum rofferr
                    602: roff_parsetext(char *p)
                    603: {
                    604:        size_t           sz;
                    605:        const char      *start;
                    606:        enum mandoc_esc  esc;
                    607:
                    608:        start = p;
                    609:
                    610:        while ('\0' != *p) {
                    611:                sz = strcspn(p, "-\\");
                    612:                p += sz;
                    613:
1.159     kristaps  614:                if ('\0' == *p)
                    615:                        break;
                    616:
1.154     kristaps  617:                if ('\\' == *p) {
                    618:                        /* Skip over escapes. */
                    619:                        p++;
                    620:                        esc = mandoc_escape
                    621:                                ((const char **)&p, NULL, NULL);
                    622:                        if (ESCAPE_ERROR == esc)
                    623:                                break;
1.155     kristaps  624:                        continue;
1.159     kristaps  625:                } else if (p == start) {
1.158     kristaps  626:                        p++;
1.155     kristaps  627:                        continue;
1.158     kristaps  628:                }
1.155     kristaps  629:
1.171     schwarze  630:                if (isalpha((unsigned char)p[-1]) &&
                    631:                    isalpha((unsigned char)p[1]))
1.155     kristaps  632:                        *p = ASCII_HYPH;
                    633:                p++;
1.94      kristaps  634:        }
                    635:
1.154     kristaps  636:        return(ROFF_CONT);
1.94      kristaps  637: }
                    638:
1.67      kristaps  639: enum rofferr
1.90      kristaps  640: roff_parseln(struct roff *r, int ln, char **bufp,
                    641:                size_t *szp, int pos, int *offs)
1.67      kristaps  642: {
                    643:        enum rofft       t;
1.109     kristaps  644:        enum rofferr     e;
1.130     kristaps  645:        int              ppos, ctl;
1.79      kristaps  646:
                    647:        /*
1.94      kristaps  648:         * Run the reserved-word filter only if we have some reserved
                    649:         * words to fill in.
                    650:         */
                    651:
1.172     schwarze  652:        e = roff_res(r, bufp, szp, ln, pos);
                    653:        if (ROFF_IGN == e)
                    654:                return(e);
                    655:        assert(ROFF_CONT == e);
1.94      kristaps  656:
1.130     kristaps  657:        ppos = pos;
1.174     kristaps  658:        ctl = roff_getcontrol(r, *bufp, &pos);
1.130     kristaps  659:
1.94      kristaps  660:        /*
1.79      kristaps  661:         * First, if a scope is open and we're not a macro, pass the
                    662:         * text through the macro's filter.  If a scope isn't open and
                    663:         * we're not a macro, just let it through.
1.125     kristaps  664:         * Finally, if there's an equation scope open, divert it into it
                    665:         * no matter our state.
1.79      kristaps  666:         */
1.74      kristaps  667:
1.130     kristaps  668:        if (r->last && ! ctl) {
1.78      kristaps  669:                t = r->last->tok;
                    670:                assert(roffs[t].text);
1.109     kristaps  671:                e = (*roffs[t].text)
                    672:                        (r, t, bufp, szp, ln, pos, pos, offs);
                    673:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  674:                if (ROFF_CONT != e)
                    675:                        return(e);
                    676:                if (r->eqn)
1.146     kristaps  677:                        return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
1.125     kristaps  678:                if (r->tbl)
1.130     kristaps  679:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.154     kristaps  680:                return(roff_parsetext(*bufp + pos));
1.130     kristaps  681:        } else if ( ! ctl) {
1.125     kristaps  682:                if (r->eqn)
1.146     kristaps  683:                        return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
1.109     kristaps  684:                if (r->tbl)
1.130     kristaps  685:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.154     kristaps  686:                return(roff_parsetext(*bufp + pos));
1.125     kristaps  687:        } else if (r->eqn)
1.146     kristaps  688:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
1.67      kristaps  689:
1.79      kristaps  690:        /*
                    691:         * If a scope is open, go to the child handler for that macro,
                    692:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  693:         * Don't do so if an equation is open.
1.79      kristaps  694:         */
1.78      kristaps  695:
1.79      kristaps  696:        if (r->last) {
                    697:                t = r->last->tok;
                    698:                assert(roffs[t].sub);
                    699:                return((*roffs[t].sub)
1.90      kristaps  700:                                (r, t, bufp, szp,
1.130     kristaps  701:                                 ln, ppos, pos, offs));
1.79      kristaps  702:        }
1.78      kristaps  703:
1.79      kristaps  704:        /*
                    705:         * Lastly, as we've no scope open, try to look up and execute
                    706:         * the new macro.  If no macro is found, simply return and let
                    707:         * the compilers handle it.
                    708:         */
1.67      kristaps  709:
1.106     kristaps  710:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79      kristaps  711:                return(ROFF_CONT);
1.67      kristaps  712:
1.75      kristaps  713:        assert(roffs[t].proc);
1.78      kristaps  714:        return((*roffs[t].proc)
1.90      kristaps  715:                        (r, t, bufp, szp,
                    716:                         ln, ppos, pos, offs));
1.74      kristaps  717: }
                    718:
                    719:
1.117     kristaps  720: void
1.74      kristaps  721: roff_endparse(struct roff *r)
                    722: {
                    723:
1.110     kristaps  724:        if (r->last)
1.128     kristaps  725:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.109     kristaps  726:                                r->last->line, r->last->col, NULL);
1.117     kristaps  727:
1.125     kristaps  728:        if (r->eqn) {
1.128     kristaps  729:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.148     kristaps  730:                                r->eqn->eqn.ln, r->eqn->eqn.pos, NULL);
1.151     kristaps  731:                eqn_end(&r->eqn);
1.125     kristaps  732:        }
                    733:
1.117     kristaps  734:        if (r->tbl) {
1.128     kristaps  735:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.117     kristaps  736:                                r->tbl->line, r->tbl->pos, NULL);
1.151     kristaps  737:                tbl_end(&r->tbl);
1.117     kristaps  738:        }
1.67      kristaps  739: }
                    740:
                    741: /*
                    742:  * Parse a roff node's type from the input buffer.  This must be in the
                    743:  * form of ".foo xxx" in the usual way.
                    744:  */
                    745: static enum rofft
1.106     kristaps  746: roff_parse(struct roff *r, const char *buf, int *pos)
1.67      kristaps  747: {
1.106     kristaps  748:        const char      *mac;
                    749:        size_t           maclen;
1.67      kristaps  750:        enum rofft       t;
                    751:
1.144     kristaps  752:        if ('\0' == buf[*pos] || '"' == buf[*pos] ||
                    753:                        '\t' == buf[*pos] || ' ' == buf[*pos])
1.67      kristaps  754:                return(ROFF_MAX);
                    755:
1.144     kristaps  756:        /*
                    757:         * We stop the macro parse at an escape, tab, space, or nil.
                    758:         * However, `\}' is also a valid macro, so make sure we don't
                    759:         * clobber it by seeing the `\' as the end of token.
                    760:         */
                    761:
1.106     kristaps  762:        mac = buf + *pos;
1.144     kristaps  763:        maclen = strcspn(mac + 1, " \\\t\0") + 1;
1.67      kristaps  764:
1.106     kristaps  765:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  766:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  767:
1.127     kristaps  768:        *pos += (int)maclen;
1.130     kristaps  769:
1.67      kristaps  770:        while (buf[*pos] && ' ' == buf[*pos])
                    771:                (*pos)++;
                    772:
                    773:        return(t);
                    774: }
                    775:
                    776: /* ARGSUSED */
                    777: static enum rofferr
1.76      kristaps  778: roff_cblock(ROFF_ARGS)
1.67      kristaps  779: {
                    780:
1.79      kristaps  781:        /*
                    782:         * A block-close `..' should only be invoked as a child of an
                    783:         * ignore macro, otherwise raise a warning and just ignore it.
                    784:         */
                    785:
1.76      kristaps  786:        if (NULL == r->last) {
1.128     kristaps  787:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  788:                return(ROFF_IGN);
                    789:        }
1.67      kristaps  790:
1.81      kristaps  791:        switch (r->last->tok) {
                    792:        case (ROFF_am):
                    793:                /* FALLTHROUGH */
                    794:        case (ROFF_ami):
                    795:                /* FALLTHROUGH */
                    796:        case (ROFF_am1):
                    797:                /* FALLTHROUGH */
                    798:        case (ROFF_de):
1.108     schwarze  799:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  800:                /* FALLTHROUGH */
                    801:        case (ROFF_dei):
                    802:                /* FALLTHROUGH */
                    803:        case (ROFF_ig):
                    804:                break;
                    805:        default:
1.128     kristaps  806:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  807:                return(ROFF_IGN);
1.76      kristaps  808:        }
1.67      kristaps  809:
1.76      kristaps  810:        if ((*bufp)[pos])
1.128     kristaps  811:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.71      kristaps  812:
                    813:        roffnode_pop(r);
1.76      kristaps  814:        roffnode_cleanscope(r);
                    815:        return(ROFF_IGN);
1.71      kristaps  816:
1.67      kristaps  817: }
                    818:
                    819:
1.76      kristaps  820: static void
                    821: roffnode_cleanscope(struct roff *r)
1.67      kristaps  822: {
                    823:
1.76      kristaps  824:        while (r->last) {
1.173     schwarze  825:                if (--r->last->endspan != 0)
1.76      kristaps  826:                        break;
                    827:                roffnode_pop(r);
                    828:        }
1.67      kristaps  829: }
                    830:
                    831:
1.75      kristaps  832: /* ARGSUSED */
1.74      kristaps  833: static enum rofferr
1.75      kristaps  834: roff_ccond(ROFF_ARGS)
1.74      kristaps  835: {
                    836:
1.76      kristaps  837:        if (NULL == r->last) {
1.128     kristaps  838:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  839:                return(ROFF_IGN);
                    840:        }
                    841:
1.82      kristaps  842:        switch (r->last->tok) {
                    843:        case (ROFF_el):
                    844:                /* FALLTHROUGH */
                    845:        case (ROFF_ie):
                    846:                /* FALLTHROUGH */
                    847:        case (ROFF_if):
                    848:                break;
                    849:        default:
1.128     kristaps  850:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.75      kristaps  851:                return(ROFF_IGN);
                    852:        }
                    853:
1.76      kristaps  854:        if (r->last->endspan > -1) {
1.128     kristaps  855:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  856:                return(ROFF_IGN);
                    857:        }
                    858:
                    859:        if ((*bufp)[pos])
1.128     kristaps  860:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.76      kristaps  861:
1.75      kristaps  862:        roffnode_pop(r);
1.76      kristaps  863:        roffnode_cleanscope(r);
                    864:        return(ROFF_IGN);
                    865: }
                    866:
1.75      kristaps  867:
1.76      kristaps  868: /* ARGSUSED */
                    869: static enum rofferr
1.80      kristaps  870: roff_block(ROFF_ARGS)
1.76      kristaps  871: {
1.78      kristaps  872:        int             sv;
                    873:        size_t          sz;
1.106     kristaps  874:        char            *name;
                    875:
                    876:        name = NULL;
1.76      kristaps  877:
1.106     kristaps  878:        if (ROFF_ig != tok) {
                    879:                if ('\0' == (*bufp)[pos]) {
1.128     kristaps  880:                        mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.106     kristaps  881:                        return(ROFF_IGN);
                    882:                }
1.107     kristaps  883:
                    884:                /*
                    885:                 * Re-write `de1', since we don't really care about
                    886:                 * groff's strange compatibility mode, into `de'.
                    887:                 */
                    888:
1.106     kristaps  889:                if (ROFF_de1 == tok)
                    890:                        tok = ROFF_de;
                    891:                if (ROFF_de == tok)
                    892:                        name = *bufp + pos;
                    893:                else
1.128     kristaps  894:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  895:                            roffs[tok].name);
1.107     kristaps  896:
1.131     schwarze  897:                while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.80      kristaps  898:                        pos++;
1.107     kristaps  899:
1.131     schwarze  900:                while (isspace((unsigned char)(*bufp)[pos]))
1.106     kristaps  901:                        (*bufp)[pos++] = '\0';
1.80      kristaps  902:        }
                    903:
1.106     kristaps  904:        roffnode_push(r, tok, name, ln, ppos);
                    905:
                    906:        /*
                    907:         * At the beginning of a `de' macro, clear the existing string
                    908:         * with the same name, if there is one.  New content will be
                    909:         * added from roff_block_text() in multiline mode.
                    910:         */
1.107     kristaps  911:
1.106     kristaps  912:        if (ROFF_de == tok)
1.108     schwarze  913:                roff_setstr(r, name, "", 0);
1.76      kristaps  914:
1.79      kristaps  915:        if ('\0' == (*bufp)[pos])
1.78      kristaps  916:                return(ROFF_IGN);
                    917:
1.107     kristaps  918:        /* If present, process the custom end-of-line marker. */
                    919:
1.78      kristaps  920:        sv = pos;
1.131     schwarze  921:        while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.78      kristaps  922:                pos++;
                    923:
                    924:        /*
                    925:         * Note: groff does NOT like escape characters in the input.
                    926:         * Instead of detecting this, we're just going to let it fly and
                    927:         * to hell with it.
                    928:         */
                    929:
                    930:        assert(pos > sv);
                    931:        sz = (size_t)(pos - sv);
                    932:
1.79      kristaps  933:        if (1 == sz && '.' == (*bufp)[sv])
                    934:                return(ROFF_IGN);
                    935:
1.98      schwarze  936:        r->last->end = mandoc_malloc(sz + 1);
1.78      kristaps  937:
                    938:        memcpy(r->last->end, *bufp + sv, sz);
                    939:        r->last->end[(int)sz] = '\0';
                    940:
1.77      kristaps  941:        if ((*bufp)[pos])
1.128     kristaps  942:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.74      kristaps  943:
1.78      kristaps  944:        return(ROFF_IGN);
                    945: }
                    946:
                    947:
                    948: /* ARGSUSED */
                    949: static enum rofferr
1.80      kristaps  950: roff_block_sub(ROFF_ARGS)
1.79      kristaps  951: {
                    952:        enum rofft      t;
                    953:        int             i, j;
                    954:
                    955:        /*
                    956:         * First check whether a custom macro exists at this level.  If
                    957:         * it does, then check against it.  This is some of groff's
                    958:         * stranger behaviours.  If we encountered a custom end-scope
                    959:         * tag and that tag also happens to be a "real" macro, then we
                    960:         * need to try interpreting it again as a real macro.  If it's
                    961:         * not, then return ignore.  Else continue.
                    962:         */
                    963:
                    964:        if (r->last->end) {
1.130     kristaps  965:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  966:                        if ((*bufp)[i] != r->last->end[j])
                    967:                                break;
                    968:
                    969:                if ('\0' == r->last->end[j] &&
                    970:                                ('\0' == (*bufp)[i] ||
                    971:                                 ' ' == (*bufp)[i] ||
                    972:                                 '\t' == (*bufp)[i])) {
                    973:                        roffnode_pop(r);
                    974:                        roffnode_cleanscope(r);
                    975:
1.130     kristaps  976:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                    977:                                i++;
                    978:
                    979:                        pos = i;
1.106     kristaps  980:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79      kristaps  981:                                return(ROFF_RERUN);
                    982:                        return(ROFF_IGN);
                    983:                }
                    984:        }
                    985:
                    986:        /*
                    987:         * If we have no custom end-query or lookup failed, then try
                    988:         * pulling it out of the hashtable.
                    989:         */
                    990:
1.137     schwarze  991:        t = roff_parse(r, *bufp, &pos);
1.79      kristaps  992:
1.106     kristaps  993:        /*
                    994:         * Macros other than block-end are only significant
                    995:         * in `de' blocks; elsewhere, simply throw them away.
                    996:         */
                    997:        if (ROFF_cblock != t) {
                    998:                if (ROFF_de == tok)
                    999:                        roff_setstr(r, r->last->name, *bufp + ppos, 1);
1.79      kristaps 1000:                return(ROFF_IGN);
1.106     kristaps 1001:        }
1.79      kristaps 1002:
                   1003:        assert(roffs[t].proc);
1.90      kristaps 1004:        return((*roffs[t].proc)(r, t, bufp, szp,
                   1005:                                ln, ppos, pos, offs));
1.79      kristaps 1006: }
                   1007:
                   1008:
                   1009: /* ARGSUSED */
                   1010: static enum rofferr
1.80      kristaps 1011: roff_block_text(ROFF_ARGS)
1.78      kristaps 1012: {
                   1013:
1.106     kristaps 1014:        if (ROFF_de == tok)
                   1015:                roff_setstr(r, r->last->name, *bufp + pos, 1);
                   1016:
1.78      kristaps 1017:        return(ROFF_IGN);
                   1018: }
                   1019:
                   1020:
                   1021: /* ARGSUSED */
                   1022: static enum rofferr
1.82      kristaps 1023: roff_cond_sub(ROFF_ARGS)
                   1024: {
                   1025:        enum rofft       t;
                   1026:        enum roffrule    rr;
1.139     kristaps 1027:        char            *ep;
1.82      kristaps 1028:
                   1029:        rr = r->last->rule;
1.139     kristaps 1030:        roffnode_cleanscope(r);
1.177   ! schwarze 1031:        t = roff_parse(r, *bufp, &pos);
1.82      kristaps 1032:
1.139     kristaps 1033:        /*
1.177   ! schwarze 1034:         * Fully handle known macros when they are structurally
        !          1035:         * required or when the conditional evaluated to true.
1.87      kristaps 1036:         */
                   1037:
1.177   ! schwarze 1038:        if ((ROFF_MAX != t) &&
        !          1039:            (ROFF_ccond == t || ROFFRULE_ALLOW == rr ||
        !          1040:             ROFFMAC_STRUCT & roffs[t].flags)) {
        !          1041:                assert(roffs[t].proc);
        !          1042:                return((*roffs[t].proc)(r, t, bufp, szp,
        !          1043:                                        ln, ppos, pos, offs));
        !          1044:        }
1.144     kristaps 1045:
1.177   ! schwarze 1046:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1047:
1.177   ! schwarze 1048:        ep = &(*bufp)[pos];
        !          1049:        while (NULL != (ep = strchr(ep, '\\'))) {
        !          1050:                if ('}' != *(++ep))
        !          1051:                        continue;
1.82      kristaps 1052:
1.177   ! schwarze 1053:                /*
        !          1054:                 * If we're at the end of line, then just chop
        !          1055:                 * off the \} and resize the buffer.
        !          1056:                 * If we aren't, then convert it to spaces.
        !          1057:                 */
1.139     kristaps 1058:
1.177   ! schwarze 1059:                if ('\0' == *(ep + 1)) {
        !          1060:                        *--ep = '\0';
        !          1061:                        *szp -= 2;
        !          1062:                } else
        !          1063:                        *(ep - 1) = *ep = ' ';
1.82      kristaps 1064:
1.177   ! schwarze 1065:                roff_ccond(r, ROFF_ccond, bufp, szp,
        !          1066:                                ln, pos, pos + 2, offs);
        !          1067:                break;
        !          1068:        }
        !          1069:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.82      kristaps 1070: }
                   1071:
                   1072: /* ARGSUSED */
                   1073: static enum rofferr
                   1074: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1075: {
1.140     kristaps 1076:        char            *ep;
1.82      kristaps 1077:        enum roffrule    rr;
                   1078:
                   1079:        rr = r->last->rule;
1.140     kristaps 1080:        roffnode_cleanscope(r);
1.82      kristaps 1081:
1.140     kristaps 1082:        ep = &(*bufp)[pos];
                   1083:        for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
                   1084:                ep++;
                   1085:                if ('}' != *ep)
                   1086:                        continue;
                   1087:                *ep = '&';
                   1088:                roff_ccond(r, ROFF_ccond, bufp, szp,
                   1089:                                ln, pos, pos + 2, offs);
1.78      kristaps 1090:        }
1.82      kristaps 1091:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74      kristaps 1092: }
                   1093:
1.88      kristaps 1094: static enum roffrule
                   1095: roff_evalcond(const char *v, int *pos)
                   1096: {
                   1097:
                   1098:        switch (v[*pos]) {
                   1099:        case ('n'):
                   1100:                (*pos)++;
                   1101:                return(ROFFRULE_ALLOW);
                   1102:        case ('e'):
                   1103:                /* FALLTHROUGH */
                   1104:        case ('o'):
                   1105:                /* FALLTHROUGH */
                   1106:        case ('t'):
                   1107:                (*pos)++;
                   1108:                return(ROFFRULE_DENY);
                   1109:        default:
                   1110:                break;
                   1111:        }
                   1112:
                   1113:        while (v[*pos] && ' ' != v[*pos])
                   1114:                (*pos)++;
                   1115:        return(ROFFRULE_DENY);
                   1116: }
                   1117:
1.75      kristaps 1118: /* ARGSUSED */
1.74      kristaps 1119: static enum rofferr
1.103     kristaps 1120: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1121: {
1.123     schwarze 1122:
                   1123:        if (ROFF_it == tok)
1.128     kristaps 1124:                mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos, "it");
1.89      kristaps 1125:
                   1126:        return(ROFF_IGN);
                   1127: }
                   1128:
1.104     kristaps 1129: /* ARGSUSED */
                   1130: static enum rofferr
1.82      kristaps 1131: roff_cond(ROFF_ARGS)
1.74      kristaps 1132: {
1.173     schwarze 1133:
                   1134:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1135:
1.134     kristaps 1136:        /*
                   1137:         * An `.el' has no conditional body: it will consume the value
                   1138:         * of the current rstack entry set in prior `ie' calls or
                   1139:         * defaults to DENY.
                   1140:         *
                   1141:         * If we're not an `el', however, then evaluate the conditional.
                   1142:         */
1.133     kristaps 1143:
1.173     schwarze 1144:        r->last->rule = ROFF_el == tok ?
1.134     kristaps 1145:                (r->rstackpos < 0 ?
                   1146:                 ROFFRULE_DENY : r->rstack[r->rstackpos--]) :
                   1147:                roff_evalcond(*bufp, &pos);
1.77      kristaps 1148:
1.134     kristaps 1149:        /*
                   1150:         * An if-else will put the NEGATION of the current evaluated
                   1151:         * conditional into the stack of rules.
                   1152:         */
                   1153:
1.84      schwarze 1154:        if (ROFF_ie == tok) {
1.134     kristaps 1155:                if (r->rstackpos == RSTACK_MAX - 1) {
                   1156:                        mandoc_msg(MANDOCERR_MEM,
                   1157:                                r->parse, ln, ppos, NULL);
                   1158:                        return(ROFF_ERR);
                   1159:                }
                   1160:                r->rstack[++r->rstackpos] =
                   1161:                        ROFFRULE_DENY == r->last->rule ?
                   1162:                        ROFFRULE_ALLOW : ROFFRULE_DENY;
1.82      kristaps 1163:        }
1.88      kristaps 1164:
                   1165:        /* If the parent has false as its rule, then so do we. */
                   1166:
1.109     kristaps 1167:        if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
1.84      schwarze 1168:                r->last->rule = ROFFRULE_DENY;
1.88      kristaps 1169:
                   1170:        /*
1.173     schwarze 1171:         * Determine scope.
                   1172:         * If there is nothing on the line after the conditional,
                   1173:         * not even whitespace, use next-line scope.
1.88      kristaps 1174:         */
1.74      kristaps 1175:
1.173     schwarze 1176:        if ('\0' == (*bufp)[pos]) {
                   1177:                r->last->endspan = 2;
                   1178:                goto out;
                   1179:        }
                   1180:
                   1181:        while (' ' == (*bufp)[pos])
                   1182:                pos++;
                   1183:
                   1184:        /* An opening brace requests multiline scope. */
1.75      kristaps 1185:
                   1186:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1187:                r->last->endspan = -1;
                   1188:                pos += 2;
1.173     schwarze 1189:                goto out;
1.109     kristaps 1190:        }
1.74      kristaps 1191:
1.77      kristaps 1192:        /*
1.173     schwarze 1193:         * Anything else following the conditional causes
                   1194:         * single-line scope.  Warn if the scope contains
                   1195:         * nothing but trailing whitespace.
1.77      kristaps 1196:         */
                   1197:
1.75      kristaps 1198:        if ('\0' == (*bufp)[pos])
1.173     schwarze 1199:                mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.77      kristaps 1200:
1.173     schwarze 1201:        r->last->endspan = 1;
1.74      kristaps 1202:
1.173     schwarze 1203: out:
1.75      kristaps 1204:        *offs = pos;
                   1205:        return(ROFF_RERUN);
1.83      schwarze 1206: }
                   1207:
                   1208:
                   1209: /* ARGSUSED */
                   1210: static enum rofferr
1.92      schwarze 1211: roff_ds(ROFF_ARGS)
                   1212: {
1.96      kristaps 1213:        char            *name, *string;
                   1214:
                   1215:        /*
                   1216:         * A symbol is named by the first word following the macro
                   1217:         * invocation up to a space.  Its value is anything after the
                   1218:         * name's trailing whitespace and optional double-quote.  Thus,
                   1219:         *
                   1220:         *  [.ds foo "bar  "     ]
                   1221:         *
                   1222:         * will have `bar  "     ' as its value.
                   1223:         */
1.92      schwarze 1224:
1.121     schwarze 1225:        string = *bufp + pos;
                   1226:        name = roff_getname(r, &string, ln, pos);
1.92      schwarze 1227:        if ('\0' == *name)
                   1228:                return(ROFF_IGN);
                   1229:
1.121     schwarze 1230:        /* Read past initial double-quote. */
                   1231:        if ('"' == *string)
1.92      schwarze 1232:                string++;
                   1233:
1.96      kristaps 1234:        /* The rest is the value. */
1.106     kristaps 1235:        roff_setstr(r, name, string, 0);
1.92      schwarze 1236:        return(ROFF_IGN);
                   1237: }
                   1238:
1.147     kristaps 1239: int
                   1240: roff_regisset(const struct roff *r, enum regs reg)
                   1241: {
                   1242:
                   1243:        return(r->regs[(int)reg].set);
                   1244: }
                   1245:
                   1246: unsigned int
                   1247: roff_regget(const struct roff *r, enum regs reg)
                   1248: {
                   1249:
                   1250:        return(r->regs[(int)reg].u);
                   1251: }
                   1252:
                   1253: void
                   1254: roff_regunset(struct roff *r, enum regs reg)
                   1255: {
                   1256:
                   1257:        r->regs[(int)reg].set = 0;
                   1258: }
1.92      schwarze 1259:
                   1260: /* ARGSUSED */
                   1261: static enum rofferr
1.89      kristaps 1262: roff_nr(ROFF_ARGS)
1.83      schwarze 1263: {
1.121     schwarze 1264:        const char      *key;
                   1265:        char            *val;
1.138     kristaps 1266:        int              iv;
1.89      kristaps 1267:
1.121     schwarze 1268:        val = *bufp + pos;
                   1269:        key = roff_getname(r, &val, ln, pos);
1.89      kristaps 1270:
                   1271:        if (0 == strcmp(key, "nS")) {
1.147     kristaps 1272:                r->regs[(int)REG_nS].set = 1;
1.149     kristaps 1273:                if ((iv = mandoc_strntoi(val, strlen(val), 10)) >= 0)
1.147     kristaps 1274:                        r->regs[(int)REG_nS].u = (unsigned)iv;
1.138     kristaps 1275:                else
1.147     kristaps 1276:                        r->regs[(int)REG_nS].u = 0u;
1.109     kristaps 1277:        }
                   1278:
1.122     schwarze 1279:        return(ROFF_IGN);
                   1280: }
                   1281:
                   1282: /* ARGSUSED */
                   1283: static enum rofferr
                   1284: roff_rm(ROFF_ARGS)
                   1285: {
                   1286:        const char       *name;
                   1287:        char             *cp;
                   1288:
                   1289:        cp = *bufp + pos;
                   1290:        while ('\0' != *cp) {
1.127     kristaps 1291:                name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
1.122     schwarze 1292:                if ('\0' != *name)
                   1293:                        roff_setstr(r, name, NULL, 0);
                   1294:        }
1.109     kristaps 1295:        return(ROFF_IGN);
1.175     schwarze 1296: }
                   1297:
                   1298: /* ARGSUSED */
                   1299: static enum rofferr
                   1300: roff_Dd(ROFF_ARGS)
                   1301: {
                   1302:        const char *const       *cp;
                   1303:
                   1304:        if (MPARSE_MDOC != r->parsetype)
                   1305:                for (cp = __mdoc_reserved; *cp; cp++)
                   1306:                        roff_setstr(r, *cp, NULL, 0);
                   1307:
                   1308:        return(ROFF_CONT);
                   1309: }
                   1310:
                   1311: /* ARGSUSED */
                   1312: static enum rofferr
                   1313: roff_TH(ROFF_ARGS)
                   1314: {
                   1315:        const char *const       *cp;
                   1316:
                   1317:        if (MPARSE_MDOC != r->parsetype)
                   1318:                for (cp = __man_reserved; *cp; cp++)
                   1319:                        roff_setstr(r, *cp, NULL, 0);
                   1320:
                   1321:        return(ROFF_CONT);
1.109     kristaps 1322: }
                   1323:
                   1324: /* ARGSUSED */
                   1325: static enum rofferr
                   1326: roff_TE(ROFF_ARGS)
                   1327: {
                   1328:
                   1329:        if (NULL == r->tbl)
1.128     kristaps 1330:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1331:        else
1.151     kristaps 1332:                tbl_end(&r->tbl);
1.109     kristaps 1333:
1.112     kristaps 1334:        return(ROFF_IGN);
                   1335: }
                   1336:
                   1337: /* ARGSUSED */
                   1338: static enum rofferr
                   1339: roff_T_(ROFF_ARGS)
                   1340: {
                   1341:
                   1342:        if (NULL == r->tbl)
1.128     kristaps 1343:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1344:        else
1.116     kristaps 1345:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1346:
1.109     kristaps 1347:        return(ROFF_IGN);
                   1348: }
                   1349:
1.156     kristaps 1350: #if 0
                   1351: static int
1.151     kristaps 1352: roff_closeeqn(struct roff *r)
                   1353: {
                   1354:
                   1355:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1356: }
1.156     kristaps 1357: #endif
1.151     kristaps 1358:
1.156     kristaps 1359: static void
1.151     kristaps 1360: roff_openeqn(struct roff *r, const char *name, int line,
                   1361:                int offs, const char *buf)
1.125     kristaps 1362: {
1.151     kristaps 1363:        struct eqn_node *e;
                   1364:        int              poff;
1.125     kristaps 1365:
                   1366:        assert(NULL == r->eqn);
1.151     kristaps 1367:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1368:
                   1369:        if (r->last_eqn)
                   1370:                r->last_eqn->next = e;
                   1371:        else
                   1372:                r->first_eqn = r->last_eqn = e;
                   1373:
                   1374:        r->eqn = r->last_eqn = e;
1.151     kristaps 1375:
                   1376:        if (buf) {
                   1377:                poff = 0;
                   1378:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1379:        }
                   1380: }
                   1381:
                   1382: /* ARGSUSED */
                   1383: static enum rofferr
                   1384: roff_EQ(ROFF_ARGS)
                   1385: {
                   1386:
                   1387:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1388:        return(ROFF_IGN);
                   1389: }
                   1390:
                   1391: /* ARGSUSED */
                   1392: static enum rofferr
                   1393: roff_EN(ROFF_ARGS)
                   1394: {
                   1395:
1.128     kristaps 1396:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1397:        return(ROFF_IGN);
                   1398: }
                   1399:
                   1400: /* ARGSUSED */
                   1401: static enum rofferr
1.109     kristaps 1402: roff_TS(ROFF_ARGS)
                   1403: {
1.176     schwarze 1404:        struct tbl_node *tbl;
1.89      kristaps 1405:
1.115     kristaps 1406:        if (r->tbl) {
1.128     kristaps 1407:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.151     kristaps 1408:                tbl_end(&r->tbl);
1.115     kristaps 1409:        }
1.83      schwarze 1410:
1.176     schwarze 1411:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1412:
                   1413:        if (r->last_tbl)
1.176     schwarze 1414:                r->last_tbl->next = tbl;
1.113     kristaps 1415:        else
1.176     schwarze 1416:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 1417:
1.176     schwarze 1418:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 1419:        return(ROFF_IGN);
1.92      schwarze 1420: }
                   1421:
1.105     kristaps 1422: /* ARGSUSED */
                   1423: static enum rofferr
1.174     kristaps 1424: roff_cc(ROFF_ARGS)
                   1425: {
                   1426:        const char      *p;
                   1427:
                   1428:        p = *bufp + pos;
                   1429:
                   1430:        if ('\0' == *p || '.' == (r->control = *p++))
                   1431:                r->control = 0;
                   1432:
                   1433:        if ('\0' != *p)
                   1434:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1435:
                   1436:        return(ROFF_IGN);
                   1437: }
                   1438:
                   1439: /* ARGSUSED */
                   1440: static enum rofferr
1.164     kristaps 1441: roff_tr(ROFF_ARGS)
                   1442: {
                   1443:        const char      *p, *first, *second;
                   1444:        size_t           fsz, ssz;
                   1445:        enum mandoc_esc  esc;
                   1446:
                   1447:        p = *bufp + pos;
                   1448:
                   1449:        if ('\0' == *p) {
                   1450:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1451:                return(ROFF_IGN);
                   1452:        }
                   1453:
                   1454:        while ('\0' != *p) {
                   1455:                fsz = ssz = 1;
                   1456:
                   1457:                first = p++;
                   1458:                if ('\\' == *first) {
                   1459:                        esc = mandoc_escape(&p, NULL, NULL);
                   1460:                        if (ESCAPE_ERROR == esc) {
                   1461:                                mandoc_msg
                   1462:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1463:                                         ln, (int)(p - *bufp), NULL);
                   1464:                                return(ROFF_IGN);
                   1465:                        }
                   1466:                        fsz = (size_t)(p - first);
                   1467:                }
                   1468:
                   1469:                second = p++;
                   1470:                if ('\\' == *second) {
                   1471:                        esc = mandoc_escape(&p, NULL, NULL);
                   1472:                        if (ESCAPE_ERROR == esc) {
                   1473:                                mandoc_msg
                   1474:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1475:                                         ln, (int)(p - *bufp), NULL);
                   1476:                                return(ROFF_IGN);
                   1477:                        }
                   1478:                        ssz = (size_t)(p - second);
1.165     kristaps 1479:                } else if ('\0' == *second) {
1.164     kristaps 1480:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1481:                                        ln, (int)(p - *bufp), NULL);
                   1482:                        second = " ";
1.165     kristaps 1483:                        p--;
1.164     kristaps 1484:                }
                   1485:
1.167     kristaps 1486:                if (fsz > 1) {
                   1487:                        roff_setstrn(&r->xmbtab, first,
                   1488:                                        fsz, second, ssz, 0);
                   1489:                        continue;
                   1490:                }
                   1491:
                   1492:                if (NULL == r->xtab)
                   1493:                        r->xtab = mandoc_calloc
                   1494:                                (128, sizeof(struct roffstr));
                   1495:
                   1496:                free(r->xtab[(int)*first].p);
                   1497:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1498:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1499:        }
                   1500:
                   1501:        return(ROFF_IGN);
                   1502: }
                   1503:
                   1504: /* ARGSUSED */
                   1505: static enum rofferr
1.105     kristaps 1506: roff_so(ROFF_ARGS)
                   1507: {
                   1508:        char *name;
                   1509:
1.128     kristaps 1510:        mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
1.105     kristaps 1511:
                   1512:        /*
                   1513:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1514:         * opening anything that's not in our cwd or anything beneath
                   1515:         * it.  Thus, explicitly disallow traversing up the file-system
                   1516:         * or using absolute paths.
                   1517:         */
                   1518:
                   1519:        name = *bufp + pos;
                   1520:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.128     kristaps 1521:                mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
1.105     kristaps 1522:                return(ROFF_ERR);
                   1523:        }
                   1524:
                   1525:        *offs = pos;
                   1526:        return(ROFF_SO);
                   1527: }
1.92      schwarze 1528:
1.106     kristaps 1529: /* ARGSUSED */
                   1530: static enum rofferr
                   1531: roff_userdef(ROFF_ARGS)
1.99      kristaps 1532: {
1.106     kristaps 1533:        const char       *arg[9];
                   1534:        char             *cp, *n1, *n2;
1.119     schwarze 1535:        int               i;
1.106     kristaps 1536:
                   1537:        /*
                   1538:         * Collect pointers to macro argument strings
                   1539:         * and null-terminate them.
                   1540:         */
                   1541:        cp = *bufp + pos;
1.119     schwarze 1542:        for (i = 0; i < 9; i++)
1.120     schwarze 1543:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 1544:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1545:
1.106     kristaps 1546:        /*
                   1547:         * Expand macro arguments.
1.99      kristaps 1548:         */
1.106     kristaps 1549:        *szp = 0;
                   1550:        n1 = cp = mandoc_strdup(r->current_string);
                   1551:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1552:                i = cp[2] - '1';
                   1553:                if (0 > i || 8 < i) {
                   1554:                        /* Not an argument invocation. */
                   1555:                        cp += 2;
                   1556:                        continue;
                   1557:                }
                   1558:
                   1559:                *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
                   1560:                n2 = mandoc_malloc(*szp);
                   1561:
                   1562:                strlcpy(n2, n1, (size_t)(cp - n1 + 1));
                   1563:                strlcat(n2, arg[i], *szp);
                   1564:                strlcat(n2, cp + 3, *szp);
                   1565:
                   1566:                cp = n2 + (cp - n1);
                   1567:                free(n1);
                   1568:                n1 = n2;
1.99      kristaps 1569:        }
                   1570:
1.106     kristaps 1571:        /*
                   1572:         * Replace the macro invocation
                   1573:         * by the expanded macro.
                   1574:         */
                   1575:        free(*bufp);
                   1576:        *bufp = n1;
                   1577:        if (0 == *szp)
                   1578:                *szp = strlen(*bufp) + 1;
                   1579:
                   1580:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   1581:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 1582: }
1.121     schwarze 1583:
                   1584: static char *
                   1585: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   1586: {
                   1587:        char     *name, *cp;
                   1588:
                   1589:        name = *cpp;
                   1590:        if ('\0' == *name)
                   1591:                return(name);
                   1592:
                   1593:        /* Read until end of name. */
                   1594:        for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
                   1595:                if ('\\' != *cp)
                   1596:                        continue;
                   1597:                cp++;
                   1598:                if ('\\' == *cp)
                   1599:                        continue;
1.128     kristaps 1600:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.121     schwarze 1601:                *cp = '\0';
                   1602:                name = cp;
                   1603:        }
                   1604:
                   1605:        /* Nil-terminate name. */
                   1606:        if ('\0' != *cp)
                   1607:                *(cp++) = '\0';
                   1608:
                   1609:        /* Read past spaces. */
                   1610:        while (' ' == *cp)
                   1611:                cp++;
                   1612:
                   1613:        *cpp = cp;
                   1614:        return(name);
                   1615: }
                   1616:
1.106     kristaps 1617: /*
                   1618:  * Store *string into the user-defined string called *name.
                   1619:  * In multiline mode, append to an existing entry and append '\n';
                   1620:  * else replace the existing entry, if there is one.
                   1621:  * To clear an existing entry, call with (*r, *name, NULL, 0).
                   1622:  */
1.94      kristaps 1623: static void
1.106     kristaps 1624: roff_setstr(struct roff *r, const char *name, const char *string,
                   1625:        int multiline)
1.92      schwarze 1626: {
1.164     kristaps 1627:
                   1628:        roff_setstrn(&r->strtab, name, strlen(name), string,
                   1629:                        string ? strlen(string) : 0, multiline);
                   1630: }
                   1631:
                   1632: static void
1.166     kristaps 1633: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.164     kristaps 1634:                const char *string, size_t stringsz, int multiline)
                   1635: {
1.166     kristaps 1636:        struct roffkv   *n;
1.164     kristaps 1637:        char            *c;
                   1638:        int              i;
                   1639:        size_t           oldch, newch;
1.92      schwarze 1640:
1.106     kristaps 1641:        /* Search for an existing string with the same name. */
1.164     kristaps 1642:        n = *r;
                   1643:
1.166     kristaps 1644:        while (n && strcmp(name, n->key.p))
1.92      schwarze 1645:                n = n->next;
1.94      kristaps 1646:
                   1647:        if (NULL == n) {
1.106     kristaps 1648:                /* Create a new string table entry. */
1.166     kristaps 1649:                n = mandoc_malloc(sizeof(struct roffkv));
                   1650:                n->key.p = mandoc_strndup(name, namesz);
                   1651:                n->key.sz = namesz;
                   1652:                n->val.p = NULL;
                   1653:                n->val.sz = 0;
1.164     kristaps 1654:                n->next = *r;
                   1655:                *r = n;
1.106     kristaps 1656:        } else if (0 == multiline) {
                   1657:                /* In multiline mode, append; else replace. */
1.166     kristaps 1658:                free(n->val.p);
                   1659:                n->val.p = NULL;
                   1660:                n->val.sz = 0;
1.106     kristaps 1661:        }
                   1662:
                   1663:        if (NULL == string)
                   1664:                return;
                   1665:
                   1666:        /*
                   1667:         * One additional byte for the '\n' in multiline mode,
                   1668:         * and one for the terminating '\0'.
                   1669:         */
1.164     kristaps 1670:        newch = stringsz + (multiline ? 2u : 1u);
                   1671:
1.166     kristaps 1672:        if (NULL == n->val.p) {
                   1673:                n->val.p = mandoc_malloc(newch);
                   1674:                *n->val.p = '\0';
1.106     kristaps 1675:                oldch = 0;
                   1676:        } else {
1.166     kristaps 1677:                oldch = n->val.sz;
                   1678:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 1679:        }
                   1680:
                   1681:        /* Skip existing content in the destination buffer. */
1.166     kristaps 1682:        c = n->val.p + (int)oldch;
1.106     kristaps 1683:
                   1684:        /* Append new content to the destination buffer. */
1.164     kristaps 1685:        i = 0;
                   1686:        while (i < (int)stringsz) {
1.106     kristaps 1687:                /*
                   1688:                 * Rudimentary roff copy mode:
                   1689:                 * Handle escaped backslashes.
                   1690:                 */
1.164     kristaps 1691:                if ('\\' == string[i] && '\\' == string[i + 1])
                   1692:                        i++;
                   1693:                *c++ = string[i++];
1.106     kristaps 1694:        }
1.94      kristaps 1695:
1.106     kristaps 1696:        /* Append terminating bytes. */
                   1697:        if (multiline)
                   1698:                *c++ = '\n';
1.163     kristaps 1699:
1.106     kristaps 1700:        *c = '\0';
1.166     kristaps 1701:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 1702: }
                   1703:
1.94      kristaps 1704: static const char *
                   1705: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 1706: {
1.166     kristaps 1707:        const struct roffkv *n;
1.92      schwarze 1708:
1.164     kristaps 1709:        for (n = r->strtab; n; n = n->next)
1.166     kristaps 1710:                if (0 == strncmp(name, n->key.p, len) &&
                   1711:                                '\0' == n->key.p[(int)len])
                   1712:                        return(n->val.p);
1.94      kristaps 1713:
1.157     kristaps 1714:        return(NULL);
1.92      schwarze 1715: }
                   1716:
1.94      kristaps 1717: static void
1.167     kristaps 1718: roff_freestr(struct roffkv *r)
1.92      schwarze 1719: {
1.166     kristaps 1720:        struct roffkv    *n, *nn;
1.92      schwarze 1721:
1.167     kristaps 1722:        for (n = r; n; n = nn) {
1.166     kristaps 1723:                free(n->key.p);
                   1724:                free(n->val.p);
1.92      schwarze 1725:                nn = n->next;
                   1726:                free(n);
                   1727:        }
1.114     kristaps 1728: }
                   1729:
                   1730: const struct tbl_span *
                   1731: roff_span(const struct roff *r)
                   1732: {
                   1733:
                   1734:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 1735: }
                   1736:
                   1737: const struct eqn *
                   1738: roff_eqn(const struct roff *r)
                   1739: {
                   1740:
                   1741:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 1742: }
                   1743:
                   1744: /*
                   1745:  * Duplicate an input string, making the appropriate character
                   1746:  * conversations (as stipulated by `tr') along the way.
                   1747:  * Returns a heap-allocated string with all the replacements made.
                   1748:  */
                   1749: char *
                   1750: roff_strdup(const struct roff *r, const char *p)
                   1751: {
1.166     kristaps 1752:        const struct roffkv *cp;
1.164     kristaps 1753:        char            *res;
                   1754:        const char      *pp;
                   1755:        size_t           ssz, sz;
                   1756:        enum mandoc_esc  esc;
                   1757:
1.167     kristaps 1758:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 1759:                return(mandoc_strdup(p));
                   1760:        else if ('\0' == *p)
                   1761:                return(mandoc_strdup(""));
                   1762:
                   1763:        /*
                   1764:         * Step through each character looking for term matches
                   1765:         * (remember that a `tr' can be invoked with an escape, which is
                   1766:         * a glyph but the escape is multi-character).
                   1767:         * We only do this if the character hash has been initialised
                   1768:         * and the string is >0 length.
                   1769:         */
                   1770:
                   1771:        res = NULL;
                   1772:        ssz = 0;
                   1773:
                   1774:        while ('\0' != *p) {
1.167     kristaps 1775:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   1776:                        sz = r->xtab[(int)*p].sz;
                   1777:                        res = mandoc_realloc(res, ssz + sz + 1);
                   1778:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   1779:                        ssz += sz;
                   1780:                        p++;
                   1781:                        continue;
                   1782:                } else if ('\\' != *p) {
                   1783:                        res = mandoc_realloc(res, ssz + 2);
                   1784:                        res[ssz++] = *p++;
                   1785:                        continue;
                   1786:                }
                   1787:
1.164     kristaps 1788:                /* Search for term matches. */
1.167     kristaps 1789:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 1790:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 1791:                                break;
                   1792:
                   1793:                if (NULL != cp) {
                   1794:                        /*
                   1795:                         * A match has been found.
                   1796:                         * Append the match to the array and move
                   1797:                         * forward by its keysize.
                   1798:                         */
1.166     kristaps 1799:                        res = mandoc_realloc
                   1800:                                (res, ssz + cp->val.sz + 1);
                   1801:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   1802:                        ssz += cp->val.sz;
                   1803:                        p += (int)cp->key.sz;
1.164     kristaps 1804:                        continue;
                   1805:                }
                   1806:
1.167     kristaps 1807:                /*
                   1808:                 * Handle escapes carefully: we need to copy
                   1809:                 * over just the escape itself, or else we might
                   1810:                 * do replacements within the escape itself.
                   1811:                 * Make sure to pass along the bogus string.
                   1812:                 */
                   1813:                pp = p++;
                   1814:                esc = mandoc_escape(&p, NULL, NULL);
                   1815:                if (ESCAPE_ERROR == esc) {
                   1816:                        sz = strlen(pp);
1.164     kristaps 1817:                        res = mandoc_realloc(res, ssz + sz + 1);
                   1818:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 1819:                        break;
1.164     kristaps 1820:                }
1.167     kristaps 1821:                /*
                   1822:                 * We bail out on bad escapes.
                   1823:                 * No need to warn: we already did so when
                   1824:                 * roff_res() was called.
                   1825:                 */
                   1826:                sz = (int)(p - pp);
                   1827:                res = mandoc_realloc(res, ssz + sz + 1);
                   1828:                memcpy(res + ssz, pp, sz);
                   1829:                ssz += sz;
1.164     kristaps 1830:        }
                   1831:
                   1832:        res[(int)ssz] = '\0';
                   1833:        return(res);
1.174     kristaps 1834: }
                   1835:
                   1836: /*
                   1837:  * Find out whether a line is a macro line or not.
                   1838:  * If it is, adjust the current position and return one; if it isn't,
                   1839:  * return zero and don't change the current position.
                   1840:  * If the control character has been set with `.cc', then let that grain
                   1841:  * precedence.
                   1842:  * This is slighly contrary to groff, where using the non-breaking
                   1843:  * control character when `cc' has been invoked will cause the
                   1844:  * non-breaking macro contents to be printed verbatim.
                   1845:  */
                   1846: int
                   1847: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   1848: {
                   1849:        int             pos;
                   1850:
                   1851:        pos = *ppos;
                   1852:
                   1853:        if (0 != r->control && cp[pos] == r->control)
                   1854:                pos++;
                   1855:        else if (0 != r->control)
                   1856:                return(0);
                   1857:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   1858:                pos += 2;
                   1859:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   1860:                pos++;
                   1861:        else
                   1862:                return(0);
                   1863:
                   1864:        while (' ' == cp[pos] || '\t' == cp[pos])
                   1865:                pos++;
                   1866:
                   1867:        *ppos = pos;
                   1868:        return(1);
1.74      kristaps 1869: }

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