=================================================================== RCS file: /cvs/mandoc/roff.c,v retrieving revision 1.68 retrieving revision 1.103 diff -u -p -r1.68 -r1.103 --- mandoc/roff.c 2010/05/15 18:43:59 1.68 +++ mandoc/roff.c 2010/12/01 10:21:25 1.103 @@ -1,6 +1,7 @@ -/* $Id: roff.c,v 1.68 2010/05/15 18:43:59 kristaps Exp $ */ +/* $Id: roff.c,v 1.103 2010/12/01 10:21:25 kristaps Exp $ */ /* * Copyright (c) 2010 Kristaps Dzonsons + * Copyright (c) 2010 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 @@ -19,26 +20,74 @@ #endif #include +#include +#include +#include #include #include +#include #include "mandoc.h" #include "roff.h" +#include "libmandoc.h" +#define RSTACK_MAX 128 + +#define ROFF_CTL(c) \ + ('.' == (c) || '\'' == (c)) + +#if 1 +#define ROFF_DEBUG(fmt, args...) \ + do { /* Nothing. */ } while (/*CONSTCOND*/ 0) +#else +#define ROFF_DEBUG(fmt, args...) \ + do { fprintf(stderr, fmt , ##args); } while (/*CONSTCOND*/ 0) +#endif + enum rofft { - ROFF_de, - ROFF_dei, + ROFF_ad, ROFF_am, ROFF_ami, + ROFF_am1, + ROFF_de, + ROFF_dei, + ROFF_de1, + ROFF_ds, + ROFF_el, + ROFF_hy, + ROFF_ie, + ROFF_if, ROFF_ig, - ROFF_close, + ROFF_ne, + ROFF_nh, + ROFF_rm, + ROFF_tr, + ROFF_cblock, + ROFF_ccond, /* FIXME: remove this. */ + ROFF_nr, ROFF_MAX }; +enum roffrule { + ROFFRULE_ALLOW, + ROFFRULE_DENY +}; + + +struct roffstr { + char *name; /* key of symbol */ + char *string; /* current value */ + struct roffstr *next; /* next in list */ +}; + struct roff { struct roffnode *last; /* leaf of stack */ mandocmsg msg; /* err/warn/fatal messages */ void *data; /* privdata for messages */ + enum roffrule rstack[RSTACK_MAX]; /* stack of !`ie' rules */ + int rstackpos; /* position in rstack */ + struct regset *regs; /* read/writable registers */ + struct roffstr *first_string; }; struct roffnode { @@ -46,45 +95,119 @@ struct roffnode { struct roffnode *parent; /* up one in stack */ int line; /* parse line */ int col; /* parse col */ + 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 /* current pos in buffer */ + 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 sub; /* child of control black */ - roffproc new; /* root of stack (type = ROFF_MAX) */ + 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; }; -static enum rofferr roff_ignore(ROFF_ARGS); -static enum rofferr roff_new_close(ROFF_ARGS); -static enum rofferr roff_new_ig(ROFF_ARGS); -static enum rofferr roff_sub_ig(ROFF_ARGS); +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_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_freestr(struct roff *); +static const char *roff_getstrn(const struct roff *, + const char *, size_t); +static enum rofferr roff_line_ignore(ROFF_ARGS); +static enum rofferr roff_nr(ROFF_ARGS); +static int roff_res(struct roff *, + char **, size_t *, int); +static void roff_setstr(struct roff *, + const char *, const char *); +static char *roff_strdup(const char *); -const struct roffmac roffs[ROFF_MAX] = { - { "de", NULL, roff_ignore }, - { "dei", NULL, roff_ignore }, - { "am", NULL, roff_ignore }, - { "ami", NULL, roff_ignore }, - { "ig", roff_sub_ig, roff_new_ig }, - { ".", NULL, roff_new_close }, +/* See roff_hash_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 }, + { "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 }, + { "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 }, + { "ne", roff_line_ignore, NULL, NULL, 0, NULL }, + { "nh", roff_line_ignore, NULL, NULL, 0, NULL }, + { "rm", roff_line_ignore, NULL, NULL, 0, NULL }, + { "tr", roff_line_ignore, NULL, NULL, 0, NULL }, + { ".", roff_cblock, NULL, NULL, 0, NULL }, + { "\\}", roff_ccond, NULL, NULL, 0, NULL }, + { "nr", roff_nr, NULL, NULL, 0, NULL }, }; -static void roff_alloc1(struct roff *); static void roff_free1(struct roff *); static enum rofft roff_hash_find(const char *); -static int roffnode_push(struct roff *, +static void roff_hash_init(void); +static void roffnode_cleanscope(struct roff *); +static void roffnode_push(struct roff *, enum rofft, int, int); static void roffnode_pop(struct roff *); static enum rofft roff_parse(const char *, int *); +static int roff_parse_nat(const char *, unsigned int *); +/* See roff_hash_find() */ +#define ROFF_HASH(p) (p[0] - ASCII_LO) +static void +roff_hash_init(void) +{ + struct roffmac *n; + int buc, i; + + for (i = 0; i < (int)ROFF_MAX; 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. @@ -92,14 +215,27 @@ static enum rofft roff_parse(const char *, int *); static enum rofft roff_hash_find(const char *p) { - int i; + int buc; + struct roffmac *n; - /* FIXME: make this be fast and efficient. */ + /* + * 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. + */ - for (i = 0; i < (int)ROFF_MAX; i++) - if (0 == strcmp(roffs[i].name, p)) - return((enum rofft)i); + 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 == strcmp(n->name, p)) + return((enum rofft)(n - roffs)); + return(ROFF_MAX); } @@ -113,9 +249,17 @@ roffnode_pop(struct roff *r) { struct roffnode *p; - if (NULL == (p = r->last)) - return; - r->last = p->parent; + assert(r->last); + p = r->last; + + if (ROFF_el == p->tok) + if (r->rstackpos > -1) + r->rstackpos--; + + ROFF_DEBUG("roff: popping scope\n"); + r->last = r->last->parent; + if (p->end) + free(p->end); free(p); } @@ -124,23 +268,19 @@ roffnode_pop(struct roff *r) * Push a roff node onto the instruction stack. This must later be * removed with roffnode_pop(). */ -static int +static void roffnode_push(struct roff *r, enum rofft tok, int line, int col) { struct roffnode *p; - if (NULL == (p = calloc(1, sizeof(struct roffnode)))) { - (*r->msg)(MANDOCERR_MEM, r->data, line, col, NULL); - return(0); - } - + p = mandoc_calloc(1, sizeof(struct roffnode)); p->tok = tok; p->parent = r->last; p->line = line; p->col = col; + p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY; r->last = p; - return(1); } @@ -150,23 +290,15 @@ roff_free1(struct roff *r) while (r->last) roffnode_pop(r); + roff_freestr(r); } -static void -roff_alloc1(struct roff *r) -{ - - /* Do nothing for now. */ -} - - void roff_reset(struct roff *r) { roff_free1(r); - roff_alloc1(r); } @@ -180,49 +312,166 @@ roff_free(struct roff *r) struct roff * -roff_alloc(const mandocmsg msg, void *data) +roff_alloc(struct regset *regs, void *data, const mandocmsg msg) { struct roff *r; - if (NULL == (r = calloc(1, sizeof(struct roff)))) { - (*msg)(MANDOCERR_MEM, data, 0, 0, NULL); - return(0); - } - + r = mandoc_calloc(1, sizeof(struct roff)); + r->regs = regs; r->msg = msg; r->data = data; + r->rstackpos = -1; + + roff_hash_init(); return(r); } +/* + * Pre-filter each and every line for reserved words (one beginning with + * `\*', e.g., `\*(ab'). These must be handled before the actual line + * is processed. + */ +static int +roff_res(struct roff *r, char **bufp, size_t *szp, int pos) +{ + const char *cp, *cpp, *st, *res; + int i, maxl; + size_t nsz; + char *n; + + /* LINTED */ + for (cp = &(*bufp)[pos]; (cpp = strstr(cp, "\\*")); cp++) { + cp = cpp + 2; + switch (*cp) { + case ('('): + cp++; + maxl = 2; + break; + case ('['): + cp++; + maxl = 0; + break; + default: + maxl = 1; + break; + } + + st = cp; + + for (i = 0; 0 == maxl || i < maxl; i++, cp++) { + if ('\0' == *cp) + return(1); /* Error. */ + if (0 == maxl && ']' == *cp) + break; + } + + res = roff_getstrn(r, st, (size_t)i); + + if (NULL == res) { + cp -= maxl ? 1 : 0; + continue; + } + + ROFF_DEBUG("roff: splicing reserved: [%.*s]\n", i, st); + + nsz = *szp + strlen(res) + 1; + n = mandoc_malloc(nsz); + + *n = '\0'; + + strlcat(n, *bufp, (size_t)(cpp - *bufp + 1)); + strlcat(n, res, nsz); + strlcat(n, cp + (maxl ? 0 : 1), nsz); + + free(*bufp); + + *bufp = n; + *szp = nsz; + return(0); + } + + return(1); +} + + enum rofferr -roff_parseln(struct roff *r, int ln, char **bufp, size_t *szp) +roff_parseln(struct roff *r, int ln, char **bufp, + size_t *szp, int pos, int *offs) { enum rofft t; int ppos; - if (NULL != r->last) { - /* - * If there's a node on the stack, then jump directly - * into its processing function. - */ + /* + * Run the reserved-word filter only if we have some reserved + * words to fill in. + */ + + if (r->first_string && ! roff_res(r, bufp, szp, pos)) + return(ROFF_RERUN); + + /* + * 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. + */ + + if (r->last && ! ROFF_CTL((*bufp)[pos])) { t = r->last->tok; - assert(roffs[t].sub); - return((*roffs[t].sub)(r, bufp, szp, ln, 0)); - } else if ('.' != (*bufp)[0] && NULL == r->last) - /* Return when in free text without a context. */ + assert(roffs[t].text); + ROFF_DEBUG("roff: intercept scoped text: %s, [%s]\n", + roffs[t].name, &(*bufp)[pos]); + return((*roffs[t].text) + (r, t, bufp, szp, + ln, pos, pos, offs)); + } else if ( ! ROFF_CTL((*bufp)[pos])) return(ROFF_CONT); - /* There's nothing on the stack: make us anew. */ + /* + * If a scope is open, go to the child handler for that macro, + * as it may want to preprocess before doing anything with it. + */ - if (ROFF_MAX == (t = roff_parse(*bufp, &ppos))) + if (r->last) { + t = r->last->tok; + assert(roffs[t].sub); + ROFF_DEBUG("roff: intercept scoped context: %s, [%s]\n", + roffs[t].name, &(*bufp)[pos]); + return((*roffs[t].sub) + (r, t, bufp, szp, + ln, pos, 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. + */ + + ppos = pos; + if (ROFF_MAX == (t = roff_parse(*bufp, &pos))) return(ROFF_CONT); - assert(roffs[t].new); - return((*roffs[t].new)(r, bufp, szp, ln, ppos)); + ROFF_DEBUG("roff: intercept new-scope: %s, [%s]\n", + roffs[t].name, &(*bufp)[pos]); + assert(roffs[t].proc); + return((*roffs[t].proc) + (r, t, bufp, szp, + ln, ppos, pos, offs)); } +int +roff_endparse(struct roff *r) +{ + + if (NULL == r->last) + return(1); + return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, r->last->line, + r->last->col, NULL)); +} + + /* * Parse a roff node's type from the input buffer. This must be in the * form of ".foo xxx" in the usual way. @@ -234,8 +483,8 @@ roff_parse(const char *buf, int *pos) char mac[5]; enum rofft t; - assert('.' == buf[0]); - *pos = 1; + assert(ROFF_CTL(buf[*pos])); + (*pos)++; while (buf[*pos] && (' ' == buf[*pos] || '\t' == buf[*pos])) (*pos)++; @@ -246,7 +495,7 @@ roff_parse(const char *buf, int *pos) for (j = 0; j < 4; j++, (*pos)++) if ('\0' == (mac[j] = buf[*pos])) break; - else if (' ' == buf[*pos]) + else if (' ' == buf[*pos] || (j && '\\' == buf[*pos])) break; if (j == 4 || j < 1) @@ -264,67 +513,610 @@ roff_parse(const char *buf, int *pos) } +static int +roff_parse_nat(const char *buf, unsigned int *res) +{ + char *ep; + long lval; + + errno = 0; + lval = strtol(buf, &ep, 10); + if (buf[0] == '\0' || *ep != '\0') + return(0); + if ((errno == ERANGE && + (lval == LONG_MAX || lval == LONG_MIN)) || + (lval > INT_MAX || lval < 0)) + return(0); + + *res = (unsigned int)lval; + return(1); +} + + /* ARGSUSED */ static enum rofferr -roff_ignore(ROFF_ARGS) +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) { + if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) + return(ROFF_ERR); + return(ROFF_IGN); + } + + switch (r->last->tok) { + case (ROFF_am): + /* FALLTHROUGH */ + case (ROFF_ami): + /* FALLTHROUGH */ + case (ROFF_am1): + /* FALLTHROUGH */ + case (ROFF_de): + /* FALLTHROUGH */ + case (ROFF_dei): + /* FALLTHROUGH */ + case (ROFF_de1): + /* FALLTHROUGH */ + case (ROFF_ig): + break; + default: + if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) + return(ROFF_ERR); + return(ROFF_IGN); + } + + if ((*bufp)[pos]) + if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL)) + return(ROFF_ERR); + + 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_sub_ig(ROFF_ARGS) +roff_ccond(ROFF_ARGS) { - enum rofft t; - int pos; - /* Ignore free-text lines. */ + if (NULL == r->last) { + if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) + return(ROFF_ERR); + return(ROFF_IGN); + } - if ('.' != (*bufp)[ppos]) + switch (r->last->tok) { + case (ROFF_el): + /* FALLTHROUGH */ + case (ROFF_ie): + /* FALLTHROUGH */ + case (ROFF_if): + break; + default: + if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) + return(ROFF_ERR); return(ROFF_IGN); + } - /* Ignore macros unless it's a closing macro. */ + if (r->last->endspan > -1) { + if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) + return(ROFF_ERR); + return(ROFF_IGN); + } + if ((*bufp)[pos]) + if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL)) + return(ROFF_ERR); + + roffnode_pop(r); + roffnode_cleanscope(r); + return(ROFF_IGN); +} + + +/* ARGSUSED */ +static enum rofferr +roff_block(ROFF_ARGS) +{ + int sv; + size_t sz; + + if (ROFF_ig != tok && '\0' == (*bufp)[pos]) { + if ( ! (*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL)) + return(ROFF_ERR); + return(ROFF_IGN); + } else if (ROFF_ig != tok) { + while ((*bufp)[pos] && ' ' != (*bufp)[pos]) + pos++; + while (' ' == (*bufp)[pos]) + pos++; + } + + roffnode_push(r, tok, ln, ppos); + + if ('\0' == (*bufp)[pos]) + return(ROFF_IGN); + + sv = pos; + while ((*bufp)[pos] && ' ' != (*bufp)[pos] && + '\t' != (*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]) + if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL)) + return(ROFF_ERR); + + 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) { + i = pos + 1; + while (' ' == (*bufp)[i] || '\t' == (*bufp)[i]) + i++; + + for (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); + + if (ROFF_MAX != roff_parse(*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. + */ + + ppos = pos; t = roff_parse(*bufp, &pos); - if (ROFF_close != t) + + /* If we're not a comment-end, then throw it away. */ + if (ROFF_cblock != t) return(ROFF_IGN); - roffnode_pop(r); + 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) +{ + return(ROFF_IGN); } /* ARGSUSED */ static enum rofferr -roff_new_close(ROFF_ARGS) +roff_cond_sub(ROFF_ARGS) { + enum rofft t; + enum roffrule rr; + ppos = pos; + rr = r->last->rule; + + /* + * Clean out scope. If we've closed ourselves, then don't + * continue. + */ + + roffnode_cleanscope(r); + + if (ROFF_MAX == (t = roff_parse(*bufp, &pos))) { + if ('\\' == (*bufp)[pos] && '}' == (*bufp)[pos + 1]) + return(roff_ccond + (r, ROFF_ccond, bufp, szp, + ln, pos, pos + 2, offs)); + return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT); + } + /* - if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL)) + * A denied conditional must evaluate its children if and only + * if they're either structurally required (such as loops and + * conditionals) or a closing macro. + */ + if (ROFFRULE_DENY == rr) + if ( ! (ROFFMAC_STRUCT & roffs[t].flags)) + if (ROFF_ccond != t) + return(ROFF_IGN); + + assert(roffs[t].proc); + return((*roffs[t].proc)(r, t, bufp, szp, + ln, ppos, pos, offs)); +} + + +/* ARGSUSED */ +static enum rofferr +roff_cond_text(ROFF_ARGS) +{ + char *ep, *st; + enum roffrule rr; + + rr = r->last->rule; + + /* + * We display the value of the text if out current evaluation + * scope permits us to do so. + */ + + /* FIXME: use roff_ccond? */ + + st = &(*bufp)[pos]; + if (NULL == (ep = strstr(st, "\\}"))) { + roffnode_cleanscope(r); + return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT); + } + + if (ep == st || (ep > st && '\\' != *(ep - 1))) + roffnode_pop(r); + + roffnode_cleanscope(r); + return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT); +} + + +static enum roffrule +roff_evalcond(const char *v, int *pos) +{ + + switch (v[*pos]) { + case ('n'): + (*pos)++; + return(ROFFRULE_ALLOW); + case ('e'): + /* FALLTHROUGH */ + case ('o'): + /* FALLTHROUGH */ + case ('t'): + (*pos)++; + return(ROFFRULE_DENY); + default: + break; + } + + while (v[*pos] && ' ' != v[*pos]) + (*pos)++; + return(ROFFRULE_DENY); +} + + +/* ARGSUSED */ +static enum rofferr +roff_line_ignore(ROFF_ARGS) +{ + + return(ROFF_IGN); +} + + +/* ARGSUSED */ +static enum rofferr +roff_cond(ROFF_ARGS) +{ + int sv; + enum roffrule rule; + + /* Stack overflow! */ + + if (ROFF_ie == tok && r->rstackpos == RSTACK_MAX - 1) { + (*r->msg)(MANDOCERR_MEM, r->data, ln, ppos, NULL); return(ROFF_ERR); - */ - return(ROFF_CONT); + } + + /* First, evaluate the conditional. */ + + if (ROFF_el == tok) { + /* + * An `.el' will get the value of the current rstack + * entry set in prior `ie' calls or defaults to DENY. + */ + if (r->rstackpos < 0) + rule = ROFFRULE_DENY; + else + rule = r->rstack[r->rstackpos]; + } else + rule = roff_evalcond(*bufp, &pos); + + sv = pos; + + while (' ' == (*bufp)[pos]) + pos++; + + /* + * Roff is weird. If we have just white-space after the + * conditional, it's considered the BODY and we exit without + * really doing anything. Warn about this. It's probably + * wrong. + */ + + if ('\0' == (*bufp)[pos] && sv != pos) { + if ((*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL)) + return(ROFF_IGN); + return(ROFF_ERR); + } + + roffnode_push(r, tok, ln, ppos); + + r->last->rule = rule; + + ROFF_DEBUG("roff: cond: %s -> %s\n", roffs[tok].name, + ROFFRULE_ALLOW == rule ? "allow" : "deny"); + + if (ROFF_ie == tok) { + /* + * An if-else will put the NEGATION of the current + * evaluated conditional into the stack. + */ + r->rstackpos++; + if (ROFFRULE_DENY == r->last->rule) + r->rstack[r->rstackpos] = ROFFRULE_ALLOW; + else + r->rstack[r->rstackpos] = 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; + ROFF_DEBUG("roff: cond override: %s -> deny\n", + roffs[tok].name); + } + + /* + * Determine scope. If we're invoked with "\{" trailing the + * conditional, then we're in a multiline scope. Else our scope + * expires on the next line. + */ + + r->last->endspan = 1; + + if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) { + r->last->endspan = -1; + pos += 2; + ROFF_DEBUG("roff: cond-scope: %s, multi-line\n", + roffs[tok].name); + } else + ROFF_DEBUG("roff: cond-scope: %s, one-line\n", + roffs[tok].name); + + /* + * If there are no arguments on the line, the next-line scope is + * assumed. + */ + + if ('\0' == (*bufp)[pos]) + return(ROFF_IGN); + + /* Otherwise re-run the roff parser after recalculating. */ + + *offs = pos; + return(ROFF_RERUN); } /* ARGSUSED */ static enum rofferr -roff_new_ig(ROFF_ARGS) +roff_ds(ROFF_ARGS) { + char *name, *string; - return(roffnode_push(r, ROFF_ig, ln, ppos) ? - ROFF_IGN : ROFF_ERR); + /* + * 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. + */ + + name = *bufp + pos; + if ('\0' == *name) + return(ROFF_IGN); + + string = name; + /* Read until end of name. */ + while (*string && ' ' != *string) + string++; + + /* Nil-terminate name. */ + if (*string) + *(string++) = '\0'; + + /* Read past spaces. */ + while (*string && ' ' == *string) + string++; + + /* Read passed initial double-quote. */ + if (*string && '"' == *string) + string++; + + /* The rest is the value. */ + roff_setstr(r, name, string); + return(ROFF_IGN); } -int -roff_endparse(struct roff *r) +/* ARGSUSED */ +static enum rofferr +roff_nr(ROFF_ARGS) { + const char *key, *val; + struct reg *rg; - if (NULL == r->last) - return(1); - return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, - r->last->line, r->last->col, NULL)); + key = &(*bufp)[pos]; + rg = r->regs->regs; + + /* Parse register request. */ + while ((*bufp)[pos] && ' ' != (*bufp)[pos]) + pos++; + + /* + * Set our nil terminator. Because this line is going to be + * ignored anyway, we can munge it as we please. + */ + if ((*bufp)[pos]) + (*bufp)[pos++] = '\0'; + + /* Skip whitespace to register token. */ + while ((*bufp)[pos] && ' ' == (*bufp)[pos]) + pos++; + + val = &(*bufp)[pos]; + + /* Process register token. */ + + if (0 == strcmp(key, "nS")) { + rg[(int)REG_nS].set = 1; + if ( ! roff_parse_nat(val, &rg[(int)REG_nS].v.u)) + rg[(int)REG_nS].v.u = 0; + + ROFF_DEBUG("roff: register nS: %u\n", + rg[(int)REG_nS].v.u); + } else + ROFF_DEBUG("roff: ignoring register: %s\n", key); + + return(ROFF_IGN); +} + + +static char * +roff_strdup(const char *name) +{ + char *namecopy, *sv; + + /* + * This isn't a nice simple mandoc_strdup() because we must + * handle roff's stupid double-escape rule. + */ + sv = namecopy = mandoc_malloc(strlen(name) + 1); + while (*name) { + if ('\\' == *name && '\\' == *(name + 1)) + name++; + *namecopy++ = *name++; + } + + *namecopy = '\0'; + return(sv); +} + + +static void +roff_setstr(struct roff *r, const char *name, const char *string) +{ + struct roffstr *n; + char *namecopy; + + n = r->first_string; + while (n && strcmp(name, n->name)) + n = n->next; + + if (NULL == n) { + namecopy = mandoc_strdup(name); + n = mandoc_malloc(sizeof(struct roffstr)); + n->name = namecopy; + n->next = r->first_string; + r->first_string = n; + } else + free(n->string); + + /* Don't use mandoc_strdup: clean out double-escapes. */ + n->string = string ? roff_strdup(string) : NULL; + ROFF_DEBUG("roff: new symbol: [%s] = [%s]\n", name, n->string); +} + + +static const char * +roff_getstrn(const struct roff *r, const char *name, size_t len) +{ + const struct roffstr *n; + + n = r->first_string; + while (n && (strncmp(name, n->name, len) || '\0' != n->name[(int)len])) + n = n->next; + + return(n ? n->string : NULL); +} + + +static void +roff_freestr(struct roff *r) +{ + struct roffstr *n, *nn; + + for (n = r->first_string; n; n = nn) { + free(n->name); + free(n->string); + nn = n->next; + free(n); + } + + r->first_string = NULL; }