diff options
| -rw-r--r-- | roff.c | 80 |
1 files changed, 44 insertions, 36 deletions
@@ -493,32 +493,44 @@ 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 *start; /* start of the string to process */ 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 */ + size_t ressz; /* size of the replacement string */ int expand_count; /* to avoid infinite loops */ expand_count = 0; + start = *bufp + pos; + stesc = strchr(start, '\0') - 1; + while (stesc-- > start) { -again: - cp = *bufp + pos; - while (NULL != (cp = strchr(cp, '\\'))) { - stesc = cp++; + /* Search backwards for the next backslash. */ + + if ('\\' != *stesc) + continue; + + /* If it is escaped, skip it. */ + + for (cp = stesc - 1; cp >= start; cp--) + if ('\\' != *cp) + break; + + if (0 == (stesc - cp) % 2) { + stesc = cp; + continue; + } /* - * 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. + * Everything except user-defined strings and number + * registers is only checked, not expanded. */ - if ('\0' == *cp) - return(ROFF_CONT); - + cp = stesc + 1; switch (*cp) { case ('*'): res = NULL; @@ -527,15 +539,17 @@ again: 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); + if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL)) + mandoc_msg(MANDOCERR_BADESCAPE, r->parse, + ln, (int)(stesc - *bufp), NULL); + continue; } - cp++; + if (EXPAND_LIMIT < ++expand_count) { + mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, + ln, (int)(stesc - *bufp), NULL); + return(ROFF_IGN); + } /* * The third character decides the length @@ -543,9 +557,9 @@ again: * Save a pointer to the name. */ - switch (*cp) { + switch (*++cp) { case ('\0'): - return(ROFF_CONT); + continue; case ('('): cp++; maxl = 2; @@ -568,7 +582,7 @@ again: (MANDOCERR_BADESCAPE, r->parse, ln, (int)(stesc - *bufp), NULL); - return(ROFF_CONT); + continue; } if (0 == maxl && ']' == *cp) break; @@ -591,29 +605,23 @@ again: ln, (int)(stesc - *bufp), NULL); res = ""; } + ressz = strlen(res); /* Replace the escape sequence by the string. */ - pos = stesc - *bufp; - - nsz = *szp + strlen(res) + 1; - nbuf = mandoc_malloc(nsz); + *szp += ressz + 1; + nbuf = mandoc_malloc(*szp); strlcpy(nbuf, *bufp, (size_t)(stesc - *bufp + 1)); - strlcat(nbuf, res, nsz); - strlcat(nbuf, cp + (maxl ? 0 : 1), nsz); + strlcat(nbuf, res, *szp); + strlcat(nbuf, cp + (maxl ? 0 : 1), *szp); - free(*bufp); + /* Prepare for the next replacement. */ + start = nbuf + pos; + stesc = nbuf + (stesc - *bufp) + ressz; + 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); } |