/* $Id: roff.c,v 1.59 2013/10/22 20:37:54 schwarze Exp $ */ /* * Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons * Copyright (c) 2010, 2011, 2012, 2013 Ingo Schwarze * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include "mandoc.h" #include "libroff.h" #include "libmandoc.h" /* Maximum number of nested if-else conditionals. */ #define RSTACK_MAX 128 /* Maximum number of string expansions per line, to break infinite loops. */ #define EXPAND_LIMIT 1000 enum rofft { ROFF_ad, ROFF_am, ROFF_ami, ROFF_am1, ROFF_cc, ROFF_de, ROFF_dei, ROFF_de1, ROFF_ds, ROFF_el, ROFF_fam, ROFF_hw, ROFF_hy, ROFF_ie, ROFF_if, ROFF_ig, ROFF_it, ROFF_ne, ROFF_nh, ROFF_nr, ROFF_ns, ROFF_ps, ROFF_rm, ROFF_so, ROFF_ta, ROFF_tr, ROFF_Dd, ROFF_TH, ROFF_TS, ROFF_TE, ROFF_T_, ROFF_EQ, ROFF_EN, ROFF_cblock, ROFF_ccond, ROFF_USERDEF, ROFF_MAX }; enum roffrule { ROFFRULE_DENY, ROFFRULE_ALLOW }; /* * An incredibly-simple string buffer. */ struct roffstr { char *p; /* nil-terminated buffer */ size_t sz; /* saved strlen(p) */ }; /* * A key-value roffstr pair as part of a singly-linked list. */ struct roffkv { struct roffstr key; struct roffstr val; struct roffkv *next; /* next in list */ }; /* * A single number register as part of a singly-linked list. */ struct roffreg { struct roffstr key; int val; struct roffreg *next; }; struct roff { enum mparset parsetype; /* requested parse type */ struct mparse *parse; /* parse point */ struct roffnode *last; /* leaf of stack */ enum roffrule rstack[RSTACK_MAX]; /* stack of !`ie' rules */ char control; /* control character */ int rstackpos; /* position in rstack */ struct roffreg *regtab; /* number registers */ struct roffkv *strtab; /* user-defined strings & macros */ struct roffkv *xmbtab; /* multi-byte trans table (`tr') */ struct roffstr *xtab; /* single-byte trans table (`tr') */ const char *current_string; /* value of last called user macro */ struct tbl_node *first_tbl; /* first table parsed */ struct tbl_node *last_tbl; /* last table parsed */ struct tbl_node *tbl; /* current table being parsed */ struct eqn_node *last_eqn; /* last equation parsed */ struct eqn_node *first_eqn; /* first equation parsed */ struct eqn_node *eqn; /* current equation being parsed */ }; struct roffnode { enum rofft tok; /* type of node */ struct roffnode *parent; /* up one in stack */ int line; /* parse line */ int col; /* parse col */ char *name; /* node name, e.g. macro name */ char *end; /* end-rules: custom token */ int endspan; /* end-rules: next-line or infty */ enum roffrule rule; /* current evaluation rule */ }; #define ROFF_ARGS struct roff *r, /* parse ctx */ \ enum rofft tok, /* tok of macro */ \ char **bufp, /* input buffer */ \ size_t *szp, /* size of input buffer */ \ int ln, /* parse line */ \ int ppos, /* original pos in buffer */ \ int pos, /* current pos in buffer */ \ int *offs /* reset offset of buffer data */ typedef enum rofferr (*roffproc)(ROFF_ARGS); struct roffmac { const char *name; /* macro name */ roffproc proc; /* process new macro */ roffproc text; /* process as child text of macro */ roffproc sub; /* process as child of macro */ int flags; #define ROFFMAC_STRUCT (1 << 0) /* always interpret */ struct roffmac *next; }; struct predef { const char *name; /* predefined input name */ const char *str; /* replacement symbol */ }; #define PREDEF(__name, __str) \ { (__name), (__str) }, static enum rofft roffhash_find(const char *, size_t); static void roffhash_init(void); static void roffnode_cleanscope(struct roff *); static void roffnode_pop(struct roff *); static void roffnode_push(struct roff *, enum rofft, const char *, int, int); static enum rofferr roff_block(ROFF_ARGS); static enum rofferr roff_block_text(ROFF_ARGS); static enum rofferr roff_block_sub(ROFF_ARGS); static enum rofferr roff_cblock(ROFF_ARGS); static enum rofferr roff_cc(ROFF_ARGS); static enum rofferr roff_ccond(ROFF_ARGS); static enum rofferr roff_cond(ROFF_ARGS); static enum rofferr roff_cond_text(ROFF_ARGS); static enum rofferr roff_cond_sub(ROFF_ARGS); static enum rofferr roff_ds(ROFF_ARGS); static enum roffrule roff_evalcond(const char *, int *); static void roff_free1(struct roff *); static void roff_freereg(struct roffreg *); static void roff_freestr(struct roffkv *); static char *roff_getname(struct roff *, char **, int, int); static int roff_getnum(const char *, int *, int *); static int roff_getop(const char *, int *, char *); static int roff_getregn(const struct roff *, const char *, size_t); static const char *roff_getstrn(const struct roff *, const char *, size_t); static enum rofferr roff_it(ROFF_ARGS); static enum rofferr roff_line_ignore(ROFF_ARGS); static enum rofferr roff_nr(ROFF_ARGS); static void roff_openeqn(struct roff *, const char *, int, int, const char *); static enum rofft roff_parse(struct roff *, const char *, int *); static enum rofferr roff_parsetext(char **, size_t *, int, int *); static enum rofferr roff_res(struct roff *, char **, size_t *, int, int); static enum rofferr roff_rm(ROFF_ARGS); static void roff_setstr(struct roff *, const char *, const char *, int); static void roff_setstrn(struct roffkv **, const char *, size_t, const char *, size_t, int); static enum rofferr roff_so(ROFF_ARGS); static enum rofferr roff_tr(ROFF_ARGS); static enum rofferr roff_Dd(ROFF_ARGS); static enum rofferr roff_TH(ROFF_ARGS); static enum rofferr roff_TE(ROFF_ARGS); static enum rofferr roff_TS(ROFF_ARGS); static enum rofferr roff_EQ(ROFF_ARGS); static enum rofferr roff_EN(ROFF_ARGS); static enum rofferr roff_T_(ROFF_ARGS); static enum rofferr roff_userdef(ROFF_ARGS); /* See roffhash_find() */ #define ASCII_HI 126 #define ASCII_LO 33 #define HASHWIDTH (ASCII_HI - ASCII_LO + 1) static struct roffmac *hash[HASHWIDTH]; static struct roffmac roffs[ROFF_MAX] = { { "ad", roff_line_ignore, NULL, NULL, 0, NULL }, { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "cc", roff_cc, NULL, NULL, 0, NULL }, { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "ds", roff_ds, NULL, NULL, 0, NULL }, { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL }, { "fam", roff_line_ignore, NULL, NULL, 0, NULL }, { "hw", roff_line_ignore, NULL, NULL, 0, NULL }, { "hy", roff_line_ignore, NULL, NULL, 0, NULL }, { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL }, { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL }, { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL }, { "it", roff_it, NULL, NULL, 0, NULL }, { "ne", roff_line_ignore, NULL, NULL, 0, NULL }, { "nh", roff_line_ignore, NULL, NULL, 0, NULL }, { "nr", roff_nr, NULL, NULL, 0, NULL }, { "ns", roff_line_ignore, NULL, NULL, 0, NULL }, { "ps", roff_line_ignore, NULL, NULL, 0, NULL }, { "rm", roff_rm, NULL, NULL, 0, NULL }, { "so", roff_so, NULL, NULL, 0, NULL }, { "ta", roff_line_ignore, NULL, NULL, 0, NULL }, { "tr", roff_tr, NULL, NULL, 0, NULL }, { "Dd", roff_Dd, NULL, NULL, 0, NULL }, { "TH", roff_TH, NULL, NULL, 0, NULL }, { "TS", roff_TS, NULL, NULL, 0, NULL }, { "TE", roff_TE, NULL, NULL, 0, NULL }, { "T&", roff_T_, NULL, NULL, 0, NULL }, { "EQ", roff_EQ, NULL, NULL, 0, NULL }, { "EN", roff_EN, NULL, NULL, 0, NULL }, { ".", roff_cblock, NULL, NULL, 0, NULL }, { "\\}", roff_ccond, NULL, NULL, 0, NULL }, { NULL, roff_userdef, NULL, NULL, 0, NULL }, }; const char *const __mdoc_reserved[] = { "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At", "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq", "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx", "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq", "Ds", "Dt", "Dv", "Dx", "D1", "Ec", "Ed", "Ef", "Ek", "El", "Em", "em", "En", "Eo", "Eq", "Er", "Es", "Ev", "Ex", "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx", "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp", "LP", "Me", "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx", "Oc", "Oo", "Op", "Os", "Ot", "Ox", "Pa", "Pc", "Pf", "Po", "Pp", "PP", "pp", "Pq", "Qc", "Ql", "Qo", "Qq", "Or", "Rd", "Re", "Rs", "Rv", "Sc", "Sf", "Sh", "SH", "Sm", "So", "Sq", "Ss", "St", "Sx", "Sy", "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr", "%A", "%B", "%D", "%I", "%J", "%N", "%O", "%P", "%Q", "%R", "%T", "%U", "%V", NULL }; const char *const __man_reserved[] = { "AT", "B", "BI", "BR", "BT", "DE", "DS", "DT", "EE", "EN", "EQ", "EX", "HF", "HP", "I", "IB", "IP", "IR", "LP", "ME", "MT", "OP", "P", "PD", "PP", "PT", "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS", "SY", "TE", "TH", "TP", "TQ", "TS", "T&", "UC", "UE", "UR", "YS", NULL }; /* Array of injected predefined strings. */ #define PREDEFS_MAX 38 static const struct predef predefs[PREDEFS_MAX] = { #include "predefs.in" }; /* See roffhash_find() */ #define ROFF_HASH(p) (p[0] - ASCII_LO) static int roffit_lines; /* number of lines to delay */ static char *roffit_macro; /* nil-terminated macro line */ static void roffhash_init(void) { struct roffmac *n; int buc, i; for (i = 0; i < (int)ROFF_USERDEF; i++) { assert(roffs[i].name[0] >= ASCII_LO); assert(roffs[i].name[0] <= ASCII_HI); buc = ROFF_HASH(roffs[i].name); if (NULL != (n = hash[buc])) { for ( ; n->next; n = n->next) /* Do nothing. */ ; n->next = &roffs[i]; } else hash[buc] = &roffs[i]; } } /* * Look up a roff token by its name. Returns ROFF_MAX if no macro by * the nil-terminated string name could be found. */ static enum rofft roffhash_find(const char *p, size_t s) { int buc; struct roffmac *n; /* * libroff has an extremely simple hashtable, for the time * being, which simply keys on the first character, which must * be printable, then walks a chain. It works well enough until * optimised. */ if (p[0] < ASCII_LO || p[0] > ASCII_HI) return(ROFF_MAX); buc = ROFF_HASH(p); if (NULL == (n = hash[buc])) return(ROFF_MAX); for ( ; n; n = n->next) if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s]) return((enum rofft)(n - roffs)); return(ROFF_MAX); } /* * Pop the current node off of the stack of roff instructions currently * pending. */ static void roffnode_pop(struct roff *r) { struct roffnode *p; assert(r->last); p = r->last; r->last = r->last->parent; free(p->name); free(p->end); free(p); } /* * Push a roff node onto the instruction stack. This must later be * removed with roffnode_pop(). */ static void roffnode_push(struct roff *r, enum rofft tok, const char *name, int line, int col) { struct roffnode *p; p = mandoc_calloc(1, sizeof(struct roffnode)); p->tok = tok; if (name) p->name = mandoc_strdup(name); p->parent = r->last; p->line = line; p->col = col; p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY; r->last = p; } static void roff_free1(struct roff *r) { struct tbl_node *tbl; struct eqn_node *e; int i; while (NULL != (tbl = r->first_tbl)) { r->first_tbl = tbl->next; tbl_free(tbl); } r->first_tbl = r->last_tbl = r->tbl = NULL; while (NULL != (e = r->first_eqn)) { r->first_eqn = e->next; eqn_free(e); } r->first_eqn = r->last_eqn = r->eqn = NULL; while (r->last) roffnode_pop(r); roff_freestr(r->strtab); roff_freestr(r->xmbtab); r->strtab = r->xmbtab = NULL; roff_freereg(r->regtab); r->regtab = NULL; if (r->xtab) for (i = 0; i < 128; i++) free(r->xtab[i].p); free(r->xtab); r->xtab = NULL; } void roff_reset(struct roff *r) { int i; roff_free1(r); r->control = 0; for (i = 0; i < PREDEFS_MAX; i++) roff_setstr(r, predefs[i].name, predefs[i].str, 0); } void roff_free(struct roff *r) { roff_free1(r); free(r); } struct roff * roff_alloc(enum mparset type, struct mparse *parse) { struct roff *r; int i; r = mandoc_calloc(1, sizeof(struct roff)); r->parsetype = type; r->parse = parse; r->rstackpos = -1; roffhash_init(); for (i = 0; i < PREDEFS_MAX; i++) roff_setstr(r, predefs[i].name, predefs[i].str, 0); return(r); } /* * In the current line, expand user-defined strings ("\*") * and references to number registers ("\n"). * Also check the syntax of other escape sequences. */ static enum rofferr roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) { char ubuf[12]; /* buffer to print the number */ const char *stesc; /* start of an escape sequence ('\\') */ const char *stnam; /* start of the name, after "[(*" */ const char *cp; /* end of the name, e.g. before ']' */ const char *res; /* the string to be substituted */ char *nbuf; /* new buffer to copy bufp to */ size_t nsz; /* size of the new buffer */ size_t maxl; /* expected length of the escape name */ size_t naml; /* actual length of the escape name */ int expand_count; /* to avoid infinite loops */ expand_count = 0; again: cp = *bufp + pos; while (NULL != (cp = strchr(cp, '\\'))) { stesc = cp++; /* * The second character must be an asterisk or an n. * If it isn't, skip it anyway: It is escaped, * so it can't start another escape sequence. */ if ('\0' == *cp) return(ROFF_CONT); switch (*cp) { case ('*'): res = NULL; break; case ('n'): res = ubuf; break; default: if (ESCAPE_ERROR != mandoc_escape(&cp, NULL, NULL)) continue; mandoc_msg (MANDOCERR_BADESCAPE, r->parse, ln, (int)(stesc - *bufp), NULL); return(ROFF_CONT); } cp++; /* * The third character decides the length * of the name of the string or register. * Save a pointer to the name. */ switch (*cp) { case ('\0'): return(ROFF_CONT); case ('('): cp++; maxl = 2; break; case ('['): cp++; maxl = 0; break; default: maxl = 1; break; } stnam = cp; /* Advance to the end of the name. */ for (naml = 0; 0 == maxl || naml < maxl; naml++, cp++) { if ('\0' == *cp) { mandoc_msg (MANDOCERR_BADESCAPE, r->parse, ln, (int)(stesc - *bufp), NULL); return(ROFF_CONT); } if (0 == maxl && ']' == *cp) break; } /* * Retrieve the replacement string; if it is * undefined, resume searching for escapes. */ if (NULL == res) res = roff_getstrn(r, stnam, naml); else snprintf(ubuf, sizeof(ubuf), "%d", roff_getregn(r, stnam, naml)); if (NULL == res) { mandoc_msg (MANDOCERR_BADESCAPE, r->parse, ln, (int)(stesc - *bufp), NULL); res = ""; } /* Replace the escape sequence by the string. */ pos = stesc - *bufp; nsz = *szp + strlen(res) + 1; nbuf = mandoc_malloc(nsz); strlcpy(nbuf, *bufp, (size_t)(stesc - *bufp + 1)); strlcat(nbuf, res, nsz); strlcat(nbuf, cp + (maxl ? 0 : 1), nsz); free(*bufp); *bufp = nbuf; *szp = nsz; if (EXPAND_LIMIT >= ++expand_count) goto again; /* Just leave the string unexpanded. */ mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, ln, pos, NULL); return(ROFF_IGN); } return(ROFF_CONT); } /* * Process text streams: * Convert all breakable hyphens into ASCII_HYPH. * Decrement and spring input line trap. */ static enum rofferr roff_parsetext(char **bufp, size_t *szp, int pos, int *offs) { size_t sz; const char *start; char *p; int isz; enum mandoc_esc esc; start = p = *bufp + pos; while ('\0' != *p) { sz = strcspn(p, "-\\"); p += sz; if ('\0' == *p) break; if ('\\' == *p) { /* Skip over escapes. */ p++; esc = mandoc_escape ((const char const **)&p, NULL, NULL); if (ESCAPE_ERROR == esc) break; continue; } else if (p == start) { p++; continue; } if (isalpha((unsigned char)p[-1]) && isalpha((unsigned char)p[1])) *p = ASCII_HYPH; p++; } /* Spring the input line trap. */ if (1 == roffit_lines) { isz = asprintf(&p, "%s\n.%s", *bufp, roffit_macro); if (-1 == isz) { perror(NULL); exit((int)MANDOCLEVEL_SYSERR); } free(*bufp); *bufp = p; *szp = isz + 1; *offs = 0; free(roffit_macro); roffit_lines = 0; return(ROFF_REPARSE); } else if (1 < roffit_lines) --roffit_lines; return(ROFF_CONT); } enum rofferr roff_parseln(struct roff *r, int ln, char **bufp, size_t *szp, int pos, int *offs) { enum rofft t; enum rofferr e; int ppos, ctl; /* * Run the reserved-word filter only if we have some reserved * words to fill in. */ e = roff_res(r, bufp, szp, ln, pos); if (ROFF_IGN == e) return(e); assert(ROFF_CONT == e); ppos = pos; ctl = roff_getcontrol(r, *bufp, &pos); /* * First, if a scope is open and we're not a macro, pass the * text through the macro's filter. If a scope isn't open and * we're not a macro, just let it through. * Finally, if there's an equation scope open, divert it into it * no matter our state. */ if (r->last && ! ctl) { t = r->last->tok; assert(roffs[t].text); e = (*roffs[t].text) (r, t, bufp, szp, ln, pos, pos, offs); assert(ROFF_IGN == e || ROFF_CONT == e); if (ROFF_CONT != e) return(e); } if (r->eqn) return(eqn_read(&r->eqn, ln, *bufp, ppos, offs)); if ( ! ctl) { if (r->tbl) return(tbl_read(r->tbl, ln, *bufp, pos)); return(roff_parsetext(bufp, szp, pos, offs)); } /* * If a scope is open, go to the child handler for that macro, * as it may want to preprocess before doing anything with it. * Don't do so if an equation is open. */ if (r->last) { t = r->last->tok; assert(roffs[t].sub); return((*roffs[t].sub) (r, t, bufp, szp, ln, ppos, pos, offs)); } /* * Lastly, as we've no scope open, try to look up and execute * the new macro. If no macro is found, simply return and let * the compilers handle it. */ if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) return(ROFF_CONT); assert(roffs[t].proc); return((*roffs[t].proc) (r, t, bufp, szp, ln, ppos, pos, offs)); } void roff_endparse(struct roff *r) { if (r->last) mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse, r->last->line, r->last->col, NULL); if (r->eqn) { mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse, r->eqn->eqn.ln, r->eqn->eqn.pos, NULL); eqn_end(&r->eqn); } if (r->tbl) { mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse, r->tbl->line, r->tbl->pos, NULL); tbl_end(&r->tbl); } } /* * Parse a roff node's type from the input buffer. This must be in the * form of ".foo xxx" in the usual way. */ static enum rofft roff_parse(struct roff *r, const char *buf, int *pos) { const char *mac; size_t maclen; enum rofft t; if ('\0' == buf[*pos] || '"' == buf[*pos] || '\t' == buf[*pos] || ' ' == buf[*pos]) return(ROFF_MAX); /* * We stop the macro parse at an escape, tab, space, or nil. * However, `\}' is also a valid macro, so make sure we don't * clobber it by seeing the `\' as the end of token. */ mac = buf + *pos; maclen = strcspn(mac + 1, " \\\t\0") + 1; t = (r->current_string = roff_getstrn(r, mac, maclen)) ? ROFF_USERDEF : roffhash_find(mac, maclen); *pos += (int)maclen; while (buf[*pos] && ' ' == buf[*pos]) (*pos)++; return(t); } /* ARGSUSED */ static enum rofferr roff_cblock(ROFF_ARGS) { /* * A block-close `..' should only be invoked as a child of an * ignore macro, otherwise raise a warning and just ignore it. */ if (NULL == r->last) { mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); return(ROFF_IGN); } switch (r->last->tok) { case (ROFF_am): /* FALLTHROUGH */ case (ROFF_ami): /* FALLTHROUGH */ case (ROFF_am1): /* FALLTHROUGH */ case (ROFF_de): /* ROFF_de1 is remapped to ROFF_de in roff_block(). */ /* FALLTHROUGH */ case (ROFF_dei): /* FALLTHROUGH */ case (ROFF_ig): break; default: mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); return(ROFF_IGN); } if ((*bufp)[pos]) mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL); roffnode_pop(r); roffnode_cleanscope(r); return(ROFF_IGN); } static void roffnode_cleanscope(struct roff *r) { while (r->last) { if (--r->last->endspan != 0) break; roffnode_pop(r); } } /* ARGSUSED */ static enum rofferr roff_ccond(ROFF_ARGS) { if (NULL == r->last) { mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); return(ROFF_IGN); } switch (r->last->tok) { case (ROFF_el): /* FALLTHROUGH */ case (ROFF_ie): /* FALLTHROUGH */ case (ROFF_if): break; default: mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); return(ROFF_IGN); } if (r->last->endspan > -1) { mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); return(ROFF_IGN); } if ((*bufp)[pos]) mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL); roffnode_pop(r); roffnode_cleanscope(r); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_block(ROFF_ARGS) { int sv; size_t sz; char *name; name = NULL; if (ROFF_ig != tok) { if ('\0' == (*bufp)[pos]) { mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL); return(ROFF_IGN); } /* * Re-write `de1', since we don't really care about * groff's strange compatibility mode, into `de'. */ if (ROFF_de1 == tok) tok = ROFF_de; if (ROFF_de == tok) name = *bufp + pos; else mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos, roffs[tok].name); while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos])) pos++; while (isspace((unsigned char)(*bufp)[pos])) (*bufp)[pos++] = '\0'; } roffnode_push(r, tok, name, ln, ppos); /* * At the beginning of a `de' macro, clear the existing string * with the same name, if there is one. New content will be * added from roff_block_text() in multiline mode. */ if (ROFF_de == tok) roff_setstr(r, name, "", 0); if ('\0' == (*bufp)[pos]) return(ROFF_IGN); /* If present, process the custom end-of-line marker. */ sv = pos; while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos])) pos++; /* * Note: groff does NOT like escape characters in the input. * Instead of detecting this, we're just going to let it fly and * to hell with it. */ assert(pos > sv); sz = (size_t)(pos - sv); if (1 == sz && '.' == (*bufp)[sv]) return(ROFF_IGN); r->last->end = mandoc_malloc(sz + 1); memcpy(r->last->end, *bufp + sv, sz); r->last->end[(int)sz] = '\0'; if ((*bufp)[pos]) mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_block_sub(ROFF_ARGS) { enum rofft t; int i, j; /* * First check whether a custom macro exists at this level. If * it does, then check against it. This is some of groff's * stranger behaviours. If we encountered a custom end-scope * tag and that tag also happens to be a "real" macro, then we * need to try interpreting it again as a real macro. If it's * not, then return ignore. Else continue. */ if (r->last->end) { for (i = pos, j = 0; r->last->end[j]; j++, i++) if ((*bufp)[i] != r->last->end[j]) break; if ('\0' == r->last->end[j] && ('\0' == (*bufp)[i] || ' ' == (*bufp)[i] || '\t' == (*bufp)[i])) { roffnode_pop(r); roffnode_cleanscope(r); while (' ' == (*bufp)[i] || '\t' == (*bufp)[i]) i++; pos = i; if (ROFF_MAX != roff_parse(r, *bufp, &pos)) return(ROFF_RERUN); return(ROFF_IGN); } } /* * If we have no custom end-query or lookup failed, then try * pulling it out of the hashtable. */ t = roff_parse(r, *bufp, &pos); /* * Macros other than block-end are only significant * in `de' blocks; elsewhere, simply throw them away. */ if (ROFF_cblock != t) { if (ROFF_de == tok) roff_setstr(r, r->last->name, *bufp + ppos, 1); return(ROFF_IGN); } assert(roffs[t].proc); return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs)); } /* ARGSUSED */ static enum rofferr roff_block_text(ROFF_ARGS) { if (ROFF_de == tok) roff_setstr(r, r->last->name, *bufp + pos, 1); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_cond_sub(ROFF_ARGS) { enum rofft t; enum roffrule rr; char *ep; rr = r->last->rule; roffnode_cleanscope(r); t = roff_parse(r, *bufp, &pos); /* * Fully handle known macros when they are structurally * required or when the conditional evaluated to true. */ if ((ROFF_MAX != t) && (ROFF_ccond == t || ROFFRULE_ALLOW == rr || ROFFMAC_STRUCT & roffs[t].flags)) { assert(roffs[t].proc); return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs)); } /* Always check for the closing delimiter `\}'. */ ep = &(*bufp)[pos]; while (NULL != (ep = strchr(ep, '\\'))) { if ('}' != *(++ep)) continue; /* * If we're at the end of line, then just chop * off the \} and resize the buffer. * If we aren't, then convert it to spaces. */ if ('\0' == *(ep + 1)) { *--ep = '\0'; *szp -= 2; } else *(ep - 1) = *ep = ' '; roff_ccond(r, ROFF_ccond, bufp, szp, ln, pos, pos + 2, offs); break; } return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT); } /* ARGSUSED */ static enum rofferr roff_cond_text(ROFF_ARGS) { char *ep; enum roffrule rr; rr = r->last->rule; roffnode_cleanscope(r); ep = &(*bufp)[pos]; for ( ; NULL != (ep = strchr(ep, '\\')); ep++) { ep++; if ('}' != *ep) continue; *ep = '&'; roff_ccond(r, ROFF_ccond, bufp, szp, ln, pos, pos + 2, offs); } return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT); } static int roff_getnum(const char *v, int *pos, int *res) { int p, n; p = *pos; n = v[p] == '-'; if (n) p++; for (*res = 0; isdigit((unsigned char)v[p]); p++) *res += 10 * *res + v[p] - '0'; if (p == *pos + n) return 0; if (n) *res = -*res; *pos = p; return 1; } static int roff_getop(const char *v, int *pos, char *res) { int e; *res = v[*pos]; e = v[*pos + 1] == '='; switch (*res) { case '=': break; case '>': if (e) *res = 'g'; break; case '<': if (e) *res = 'l'; break; default: return(0); } *pos += 1 + e; return(*res); } static enum roffrule roff_evalcond(const char *v, int *pos) { int not, lh, rh; char op; switch (v[*pos]) { case ('n'): (*pos)++; return(ROFFRULE_ALLOW); case ('e'): /* FALLTHROUGH */ case ('o'): /* FALLTHROUGH */ case ('t'): (*pos)++; return(ROFFRULE_DENY); case ('!'): (*pos)++; not = 1; break; default: not = 0; break; } if (!roff_getnum(v, pos, &lh)) return ROFFRULE_DENY; if (!roff_getop(v, pos, &op)) { if (lh < 0) lh = 0; goto out; } if (!roff_getnum(v, pos, &rh)) return ROFFRULE_DENY; switch (op) { case 'g': lh = lh >= rh; break; case 'l': lh = lh <= rh; break; case '=': lh = lh == rh; break; case '>': lh = lh > rh; break; case '<': lh = lh < rh; break; default: return ROFFRULE_DENY; } out: if (not) lh = !lh; return lh ? ROFFRULE_ALLOW : ROFFRULE_DENY; } /* ARGSUSED */ static enum rofferr roff_line_ignore(ROFF_ARGS) { return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_cond(ROFF_ARGS) { roffnode_push(r, tok, NULL, ln, ppos); /* * An `.el' has no conditional body: it will consume the value * of the current rstack entry set in prior `ie' calls or * defaults to DENY. * * If we're not an `el', however, then evaluate the conditional. */ r->last->rule = ROFF_el == tok ? (r->rstackpos < 0 ? ROFFRULE_DENY : r->rstack[r->rstackpos--]) : roff_evalcond(*bufp, &pos); /* * An if-else will put the NEGATION of the current evaluated * conditional into the stack of rules. */ if (ROFF_ie == tok) { if (r->rstackpos == RSTACK_MAX - 1) { mandoc_msg(MANDOCERR_MEM, r->parse, ln, ppos, NULL); return(ROFF_ERR); } r->rstack[++r->rstackpos] = ROFFRULE_DENY == r->last->rule ? ROFFRULE_ALLOW : ROFFRULE_DENY; } /* If the parent has false as its rule, then so do we. */ if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule) r->last->rule = ROFFRULE_DENY; /* * Determine scope. * If there is nothing on the line after the conditional, * not even whitespace, use next-line scope. */ if ('\0' == (*bufp)[pos]) { r->last->endspan = 2; goto out; } while (' ' == (*bufp)[pos]) pos++; /* An opening brace requests multiline scope. */ if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) { r->last->endspan = -1; pos += 2; goto out; } /* * Anything else following the conditional causes * single-line scope. Warn if the scope contains * nothing but trailing whitespace. */ if ('\0' == (*bufp)[pos]) mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL); r->last->endspan = 1; out: *offs = pos; return(ROFF_RERUN); } /* ARGSUSED */ static enum rofferr roff_ds(ROFF_ARGS) { char *name, *string; /* * A symbol is named by the first word following the macro * invocation up to a space. Its value is anything after the * name's trailing whitespace and optional double-quote. Thus, * * [.ds foo "bar " ] * * will have `bar " ' as its value. */ string = *bufp + pos; name = roff_getname(r, &string, ln, pos); if ('\0' == *name) return(ROFF_IGN); /* Read past initial double-quote. */ if ('"' == *string) string++; /* The rest is the value. */ roff_setstr(r, name, string, 0); return(ROFF_IGN); } void roff_setreg(struct roff *r, const char *name, int val) { struct roffreg *reg; /* Search for an existing register with the same name. */ reg = r->regtab; while (reg && strcmp(name, reg->key.p)) reg = reg->next; if (NULL == reg) { /* Create a new register. */ reg = mandoc_malloc(sizeof(struct roffreg)); reg->key.p = mandoc_strdup(name); reg->key.sz = strlen(name); reg->next = r->regtab; r->regtab = reg; } reg->val = val; } int roff_getreg(const struct roff *r, const char *name) { struct roffreg *reg; for (reg = r->regtab; reg; reg = reg->next) if (0 == strcmp(name, reg->key.p)) return(reg->val); return(0); } static int roff_getregn(const struct roff *r, const char *name, size_t len) { struct roffreg *reg; for (reg = r->regtab; reg; reg = reg->next) if (len == reg->key.sz && 0 == strncmp(name, reg->key.p, len)) return(reg->val); return(0); } static void roff_freereg(struct roffreg *reg) { struct roffreg *old_reg; while (NULL != reg) { free(reg->key.p); old_reg = reg; reg = reg->next; free(old_reg); } } /* ARGSUSED */ static enum rofferr roff_nr(ROFF_ARGS) { const char *key; char *val; int iv; val = *bufp + pos; key = roff_getname(r, &val, ln, pos); iv = mandoc_strntoi(val, strlen(val), 10); roff_setreg(r, key, iv); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_rm(ROFF_ARGS) { const char *name; char *cp; cp = *bufp + pos; while ('\0' != *cp) { name = roff_getname(r, &cp, ln, (int)(cp - *bufp)); if ('\0' != *name) roff_setstr(r, name, NULL, 0); } return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_it(ROFF_ARGS) { char *cp; size_t len; int iv; /* Parse the number of lines. */ cp = *bufp + pos; len = strcspn(cp, " \t"); cp[len] = '\0'; if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) { mandoc_msg(MANDOCERR_NUMERIC, r->parse, ln, ppos, *bufp + 1); return(ROFF_IGN); } cp += len + 1; /* Arm the input line trap. */ roffit_lines = iv; roffit_macro = mandoc_strdup(cp); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_Dd(ROFF_ARGS) { const char *const *cp; if (MPARSE_MDOC != r->parsetype) for (cp = __mdoc_reserved; *cp; cp++) roff_setstr(r, *cp, NULL, 0); return(ROFF_CONT); } /* ARGSUSED */ static enum rofferr roff_TH(ROFF_ARGS) { const char *const *cp; if (MPARSE_MDOC != r->parsetype) for (cp = __man_reserved; *cp; cp++) roff_setstr(r, *cp, NULL, 0); return(ROFF_CONT); } /* ARGSUSED */ static enum rofferr roff_TE(ROFF_ARGS) { if (NULL == r->tbl) mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); else tbl_end(&r->tbl); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_T_(ROFF_ARGS) { if (NULL == r->tbl) mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); else tbl_restart(ppos, ln, r->tbl); return(ROFF_IGN); } #if 0 static int roff_closeeqn(struct roff *r) { return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0); } #endif static void roff_openeqn(struct roff *r, const char *name, int line, int offs, const char *buf) { struct eqn_node *e; int poff; assert(NULL == r->eqn); e = eqn_alloc(name, offs, line, r->parse); if (r->last_eqn) r->last_eqn->next = e; else r->first_eqn = r->last_eqn = e; r->eqn = r->last_eqn = e; if (buf) { poff = 0; eqn_read(&r->eqn, line, buf, offs, &poff); } } /* ARGSUSED */ static enum rofferr roff_EQ(ROFF_ARGS) { roff_openeqn(r, *bufp + pos, ln, ppos, NULL); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_EN(ROFF_ARGS) { mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_TS(ROFF_ARGS) { struct tbl_node *tbl; if (r->tbl) { mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL); tbl_end(&r->tbl); } tbl = tbl_alloc(ppos, ln, r->parse); if (r->last_tbl) r->last_tbl->next = tbl; else r->first_tbl = r->last_tbl = tbl; r->tbl = r->last_tbl = tbl; return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_cc(ROFF_ARGS) { const char *p; p = *bufp + pos; if ('\0' == *p || '.' == (r->control = *p++)) r->control = 0; if ('\0' != *p) mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL); return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_tr(ROFF_ARGS) { const char *p, *first, *second; size_t fsz, ssz; enum mandoc_esc esc; p = *bufp + pos; if ('\0' == *p) { mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL); return(ROFF_IGN); } while ('\0' != *p) { fsz = ssz = 1; first = p++; if ('\\' == *first) { esc = mandoc_escape(&p, NULL, NULL); if (ESCAPE_ERROR == esc) { mandoc_msg (MANDOCERR_BADESCAPE, r->parse, ln, (int)(p - *bufp), NULL); return(ROFF_IGN); } fsz = (size_t)(p - first); } second = p++; if ('\\' == *second) { esc = mandoc_escape(&p, NULL, NULL); if (ESCAPE_ERROR == esc) { mandoc_msg (MANDOCERR_BADESCAPE, r->parse, ln, (int)(p - *bufp), NULL); return(ROFF_IGN); } ssz = (size_t)(p - second); } else if ('\0' == *second) { mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, (int)(p - *bufp), NULL); second = " "; p--; } if (fsz > 1) { roff_setstrn(&r->xmbtab, first, fsz, second, ssz, 0); continue; } if (NULL == r->xtab) r->xtab = mandoc_calloc (128, sizeof(struct roffstr)); free(r->xtab[(int)*first].p); r->xtab[(int)*first].p = mandoc_strndup(second, ssz); r->xtab[(int)*first].sz = ssz; } return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr roff_so(ROFF_ARGS) { char *name; mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL); /* * Handle `so'. Be EXTREMELY careful, as we shouldn't be * opening anything that's not in our cwd or anything beneath * it. Thus, explicitly disallow traversing up the file-system * or using absolute paths. */ name = *bufp + pos; if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) { mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL); return(ROFF_ERR); } *offs = pos; return(ROFF_SO); } /* ARGSUSED */ static enum rofferr roff_userdef(ROFF_ARGS) { const char *arg[9]; char *cp, *n1, *n2; int i; /* * Collect pointers to macro argument strings * and null-terminate them. */ cp = *bufp + pos; for (i = 0; i < 9; i++) arg[i] = '\0' == *cp ? "" : mandoc_getarg(r->parse, &cp, ln, &pos); /* * Expand macro arguments. */ *szp = 0; n1 = cp = mandoc_strdup(r->current_string); while (NULL != (cp = strstr(cp, "\\$"))) { i = cp[2] - '1'; if (0 > i || 8 < i) { /* Not an argument invocation. */ cp += 2; continue; } *szp = strlen(n1) - 3 + strlen(arg[i]) + 1; n2 = mandoc_malloc(*szp); strlcpy(n2, n1, (size_t)(cp - n1 + 1)); strlcat(n2, arg[i], *szp); strlcat(n2, cp + 3, *szp); cp = n2 + (cp - n1); free(n1); n1 = n2; } /* * Replace the macro invocation * by the expanded macro. */ free(*bufp); *bufp = n1; if (0 == *szp) *szp = strlen(*bufp) + 1; return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ? ROFF_REPARSE : ROFF_APPEND); } static char * roff_getname(struct roff *r, char **cpp, int ln, int pos) { char *name, *cp; name = *cpp; if ('\0' == *name) return(name); /* Read until end of name. */ for (cp = name; '\0' != *cp && ' ' != *cp; cp++) { if ('\\' != *cp) continue; cp++; if ('\\' == *cp) continue; mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL); *cp = '\0'; name = cp; } /* Nil-terminate name. */ if ('\0' != *cp) *(cp++) = '\0'; /* Read past spaces. */ while (' ' == *cp) cp++; *cpp = cp; return(name); } /* * Store *string into the user-defined string called *name. * In multiline mode, append to an existing entry and append '\n'; * else replace the existing entry, if there is one. * To clear an existing entry, call with (*r, *name, NULL, 0). */ static void roff_setstr(struct roff *r, const char *name, const char *string, int multiline) { roff_setstrn(&r->strtab, name, strlen(name), string, string ? strlen(string) : 0, multiline); } static void roff_setstrn(struct roffkv **r, const char *name, size_t namesz, const char *string, size_t stringsz, int multiline) { struct roffkv *n; char *c; int i; size_t oldch, newch; /* Search for an existing string with the same name. */ n = *r; while (n && strcmp(name, n->key.p)) n = n->next; if (NULL == n) { /* Create a new string table entry. */ n = mandoc_malloc(sizeof(struct roffkv)); n->key.p = mandoc_strndup(name, namesz); n->key.sz = namesz; n->val.p = NULL; n->val.sz = 0; n->next = *r; *r = n; } else if (0 == multiline) { /* In multiline mode, append; else replace. */ free(n->val.p); n->val.p = NULL; n->val.sz = 0; } if (NULL == string) return; /* * One additional byte for the '\n' in multiline mode, * and one for the terminating '\0'. */ newch = stringsz + (multiline ? 2u : 1u); if (NULL == n->val.p) { n->val.p = mandoc_malloc(newch); *n->val.p = '\0'; oldch = 0; } else { oldch = n->val.sz; n->val.p = mandoc_realloc(n->val.p, oldch + newch); } /* Skip existing content in the destination buffer. */ c = n->val.p + (int)oldch; /* Append new content to the destination buffer. */ i = 0; while (i < (int)stringsz) { /* * Rudimentary roff copy mode: * Handle escaped backslashes. */ if ('\\' == string[i] && '\\' == string[i + 1]) i++; *c++ = string[i++]; } /* Append terminating bytes. */ if (multiline) *c++ = '\n'; *c = '\0'; n->val.sz = (int)(c - n->val.p); } static const char * roff_getstrn(const struct roff *r, const char *name, size_t len) { const struct roffkv *n; for (n = r->strtab; n; n = n->next) if (0 == strncmp(name, n->key.p, len) && '\0' == n->key.p[(int)len]) return(n->val.p); return(NULL); } static void roff_freestr(struct roffkv *r) { struct roffkv *n, *nn; for (n = r; n; n = nn) { free(n->key.p); free(n->val.p); nn = n->next; free(n); } } const struct tbl_span * roff_span(const struct roff *r) { return(r->tbl ? tbl_span(r->tbl) : NULL); } const struct eqn * roff_eqn(const struct roff *r) { return(r->last_eqn ? &r->last_eqn->eqn : NULL); } /* * Duplicate an input string, making the appropriate character * conversations (as stipulated by `tr') along the way. * Returns a heap-allocated string with all the replacements made. */ char * roff_strdup(const struct roff *r, const char *p) { const struct roffkv *cp; char *res; const char *pp; size_t ssz, sz; enum mandoc_esc esc; if (NULL == r->xmbtab && NULL == r->xtab) return(mandoc_strdup(p)); else if ('\0' == *p) return(mandoc_strdup("")); /* * Step through each character looking for term matches * (remember that a `tr' can be invoked with an escape, which is * a glyph but the escape is multi-character). * We only do this if the character hash has been initialised * and the string is >0 length. */ res = NULL; ssz = 0; while ('\0' != *p) { if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) { sz = r->xtab[(int)*p].sz; res = mandoc_realloc(res, ssz + sz + 1); memcpy(res + ssz, r->xtab[(int)*p].p, sz); ssz += sz; p++; continue; } else if ('\\' != *p) { res = mandoc_realloc(res, ssz + 2); res[ssz++] = *p++; continue; } /* Search for term matches. */ for (cp = r->xmbtab; cp; cp = cp->next) if (0 == strncmp(p, cp->key.p, cp->key.sz)) break; if (NULL != cp) { /* * A match has been found. * Append the match to the array and move * forward by its keysize. */ res = mandoc_realloc (res, ssz + cp->val.sz + 1); memcpy(res + ssz, cp->val.p, cp->val.sz); ssz += cp->val.sz; p += (int)cp->key.sz; continue; } /* * Handle escapes carefully: we need to copy * over just the escape itself, or else we might * do replacements within the escape itself. * Make sure to pass along the bogus string. */ pp = p++; esc = mandoc_escape(&p, NULL, NULL); if (ESCAPE_ERROR == esc) { sz = strlen(pp); res = mandoc_realloc(res, ssz + sz + 1); memcpy(res + ssz, pp, sz); break; } /* * We bail out on bad escapes. * No need to warn: we already did so when * roff_res() was called. */ sz = (int)(p - pp); res = mandoc_realloc(res, ssz + sz + 1); memcpy(res + ssz, pp, sz); ssz += sz; } res[(int)ssz] = '\0'; return(res); } /* * Find out whether a line is a macro line or not. * If it is, adjust the current position and return one; if it isn't, * return zero and don't change the current position. * If the control character has been set with `.cc', then let that grain * precedence. * This is slighly contrary to groff, where using the non-breaking * control character when `cc' has been invoked will cause the * non-breaking macro contents to be printed verbatim. */ int roff_getcontrol(const struct roff *r, const char *cp, int *ppos) { int pos; pos = *ppos; if (0 != r->control && cp[pos] == r->control) pos++; else if (0 != r->control) return(0); else if ('\\' == cp[pos] && '.' == cp[pos + 1]) pos += 2; else if ('.' == cp[pos] || '\'' == cp[pos]) pos++; else return(0); while (' ' == cp[pos] || '\t' == cp[pos]) pos++; *ppos = pos; return(1); }