diff options
Diffstat (limited to 'roff.c')
| -rw-r--r-- | roff.c | 97 |
1 files changed, 70 insertions, 27 deletions
@@ -485,9 +485,9 @@ roff_alloc(struct mparse *parse, int options) } /* - * In the current line, expand user-defined strings ("\*") - * and references to number registers ("\n"). - * Also check the syntax of other escape sequences. + * In the current line, expand escape sequences that tend to get + * used in numerical expressions and conditional requests. + * Also check the syntax of the remaining escape sequences. */ static enum rofferr roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) @@ -503,6 +503,9 @@ roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) size_t naml; /* actual length of the escape name */ size_t ressz; /* size of the replacement string */ int expand_count; /* to avoid infinite loops */ + int npos; /* position in numeric expression */ + int irc; /* return code from roff_evalnum() */ + char term; /* character terminating the escape */ expand_count = 0; start = *bufp + pos; @@ -525,16 +528,19 @@ roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) continue; } - /* - * Everything except user-defined strings and number - * registers is only checked, not expanded. - */ + /* Decide whether to expand or to check only. */ + term = '\0'; cp = stesc + 1; switch (*cp) { case ('*'): res = NULL; break; + case ('B'): + /* FALLTHROUGH */ + case ('w'): + term = cp[1]; + /* FALLTHROUGH */ case ('n'): res = ubuf; break; @@ -557,20 +563,27 @@ roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) * Save a pointer to the name. */ - switch (*++cp) { - case ('\0'): - continue; - case ('('): - cp++; - maxl = 2; - break; - case ('['): - cp++; + if ('\0' == term) { + switch (*++cp) { + case ('\0'): + maxl = 0; + break; + case ('('): + cp++; + maxl = 2; + break; + case ('['): + cp++; + term = ']'; + maxl = 0; + break; + default: + maxl = 1; + break; + } + } else { + cp += 2; maxl = 0; - break; - default: - maxl = 1; - break; } stnam = cp; @@ -582,10 +595,12 @@ roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) (MANDOCERR_BADESCAPE, r->parse, ln, (int)(stesc - *bufp), NULL); - continue; + break; } - if (0 == maxl && ']' == *cp) + if (0 == maxl && *cp == term) { + cp++; break; + } } /* @@ -593,11 +608,26 @@ roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) * undefined, resume searching for escapes. */ - if (NULL == res) + switch (stesc[1]) { + case ('*'): res = roff_getstrn(r, stnam, naml); - else + break; + case ('B'): + npos = 0; + irc = roff_evalnum(stnam, &npos, NULL, 0); + ubuf[0] = irc && stnam + npos + 1 == cp + ? '1' : '0'; + ubuf[1] = '\0'; + break; + case ('n'): snprintf(ubuf, sizeof(ubuf), "%d", roff_getregn(r, stnam, naml)); + break; + case ('w'): + snprintf(ubuf, sizeof(ubuf), "%d", + 24 * (int)naml); + break; + } if (NULL == res) { mandoc_msg @@ -614,7 +644,7 @@ roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos) strlcpy(nbuf, *bufp, (size_t)(stesc - *bufp + 1)); strlcat(nbuf, res, *szp); - strlcat(nbuf, cp + (maxl ? 0 : 1), *szp); + strlcat(nbuf, cp, *szp); /* Prepare for the next replacement. */ @@ -1126,7 +1156,10 @@ roff_cond_text(ROFF_ARGS) static int roff_getnum(const char *v, int *pos, int *res) { - int p, n; + int myres, n, p; + + if (NULL == res) + res = &myres; p = *pos; n = v[p] == '-'; @@ -1430,9 +1463,16 @@ roff_evalpar(const char *v, int *pos, int *res) if ( ! roff_evalnum(v, pos, res, 1)) return(0); - /* If the trailing parenthesis is missing, ignore the error. */ + /* + * Omission of the closing parenthesis + * is an error in validation mode, + * but ignored in evaluation mode. + */ + if (')' == v[*pos]) (*pos)++; + else if (NULL == res) + return(0); return(1); } @@ -1478,6 +1518,9 @@ roff_evalnum(const char *v, int *pos, int *res, int skipwhite) while (isspace((unsigned char)v[*pos])) (*pos)++; + if (NULL == res) + continue; + switch (operator) { case ('+'): *res += operand2; |