diff options
Diffstat (limited to 'Src/params.c')
| -rw-r--r-- | Src/params.c | 191 |
1 files changed, 167 insertions, 24 deletions
diff --git a/Src/params.c b/Src/params.c index c5bfc79f5..f589a740e 100644 --- a/Src/params.c +++ b/Src/params.c @@ -934,11 +934,13 @@ isident(char *s) * If supplied they are set to the length of the character before * the index position and the one at the index position. If * multibyte characters are not in use they are set to 1 for - * consistency. + * consistency. Note they aren't fully handled if a2 is non-zero, + * since they aren't needed. * * Returns a raw offset into the value from the start or end (i.e. * after the arithmetic for Meta and possible multibyte characters has - * been taken into account). + * been taken into account). This actually gives the offset *after* + * the character in question; subtract *prevcharlen if necessary. */ /**/ @@ -1178,16 +1180,23 @@ getarg(char **str, int *inv, Value v, int a2, zlong *w, t += (lastcharlen = MB_METACHARLEN(t)); /* for consistency, keep any remainder off the end */ r = (zlong)(t - s) + nchars; - if (prevcharlen) + if (prevcharlen && !nchars /* ignore if off the end */) *prevcharlen = lastcharlen; if (nextcharlen && *t) *nextcharlen = MB_METACHARLEN(t); + } else if (r == 0) { + if (prevcharlen) + *prevcharlen = 0; + if (nextcharlen && *s) { + MB_METACHARINIT(); + *nextcharlen = MB_METACHARLEN(s); + } } else { zlong nchars = (zlong)MB_METASTRLEN(s) + r; if (nchars < 0) { - /* invalid but keep index anyway */ - r = nchars; + /* make sure this isn't valid as a raw pointer */ + r -= (zlong)strlen(s); } else { MB_METACHARINIT(); for (t = s; nchars && *t; nchars--) @@ -1300,57 +1309,188 @@ getarg(char **str, int *inv, Value v, int a2, zlong *w, } return a2 ? -1 : 0; } else { + /* Searching characters */ + int slen; d = getstrvalue(v); if (!d || !*d) return 0; - len = strlen(d); + /* + * beg and len are character counts, not raw offsets. + * Remember we need to return a raw offset. + */ + len = MB_METASTRLEN(d); + slen = strlen(d); if (beg < 0) beg += len; + MB_METACHARINIT(); if (beg >= 0 && beg < len) { - char *de = d + len; + char *de = d + slen; if (a2) { + /* + * Second argument: we don't need to + * handle prevcharlen or nextcharlen, but + * we do need to handle characters appropriately. + */ if (down) { + int nmatches = 0; + char *lastpos = NULL; + if (!hasbeg) beg = len; - for (r = beg, t = d + beg; t >= d; r--, t--) { + + /* + * See below: we have to move forward, + * but need to count from the end. + */ + for (t = d, r = 0; r <= beg; r++) { sav = *t; *t = '\0'; - if (pattry(pprog, d) - && !--num) { - *t = sav; - return r; + if (pattry(pprog, d)) { + nmatches++; + lastpos = t; } *t = sav; + if (t == de) + break; + t += MB_METACHARLEN(t); } - } else - for (r = beg, t = d + beg; t <= de; r++, t++) { + + if (nmatches >= num) { + if (num > 1) { + nmatches -= num; + MB_METACHARINIT(); + for (t = d, r = 0; ; r++) { + sav = *t; + *t = '\0'; + if (pattry(pprog, d) && + nmatches-- == 0) { + lastpos = t; + *t = sav; + break; + } + *t = sav; + t += MB_METACHARLEN(t); + } + } + /* else lastpos is already OK */ + + return lastpos - d; + } + } else { + /* + * This handling of the b flag + * gives odd results, but this is the + * way it's always worked. + */ + for (t = d; beg && t <= de; beg--) + t += MB_METACHARLEN(t); + for (;;) { sav = *t; *t = '\0'; - if (pattry(pprog, d) && - !--num) { + if (pattry(pprog, d) && !--num) { *t = sav; - return r; + /* + * This time, don't increment + * pointer, since it's already + * after everything we matched. + */ + return t - d; } *t = sav; + if (t == de) + break; + t += MB_METACHARLEN(t); } + } } else { + /* + * First argument: this is the only case + * where we need prevcharlen and nextcharlen. + */ + int lastcharlen; + if (down) { + int nmatches = 0; + char *lastpos = NULL; + if (!hasbeg) beg = len; + + /* + * We can only move forward through + * multibyte strings, so record the + * matches. + * Unfortunately the count num works + * from the end, so it's easy to get the + * last one but we need to repeat if + * we want another one. + */ + for (t = d, r = 0; r <= beg; r++) { + if (pattry(pprog, t)) { + nmatches++; + lastpos = t; + } + if (t == de) + break; + t += MB_METACHARLEN(t); + } + + if (nmatches >= num) { + if (num > 1) { + /* + * Need to start again and repeat + * to get the right match. + */ + nmatches -= num; + MB_METACHARINIT(); + for (t = d, r = 0; ; r++) { + if (pattry(pprog, t) && + nmatches-- == 0) { + lastpos = t; + break; + } + t += MB_METACHARLEN(t); + } + } + /* else lastpos is already OK */ + + /* return pointer after matched char */ + lastpos += + (lastcharlen = MB_METACHARLEN(lastpos)); + if (prevcharlen) + *prevcharlen = lastcharlen; + if (nextcharlen) + *nextcharlen = MB_METACHARLEN(lastpos); + return lastpos - d; + } + for (r = beg + 1, t = d + beg; t >= d; r--, t--) { if (pattry(pprog, t) && !--num) return r; } - } else - for (r = beg + 1, t = d + beg; t <= de; r++, t++) - if (pattry(pprog, t) && - !--num) - return r; + } else { + for (t = d; beg && t <= de; beg--) + t += MB_METACHARLEN(t); + for (;;) { + if (pattry(pprog, t) && !--num) { + /* return pointer after matched char */ + t += (lastcharlen = MB_METACHARLEN(t)); + if (prevcharlen) + *prevcharlen = lastcharlen; + if (nextcharlen) + *nextcharlen = MB_METACHARLEN(t); + return t - d; + } + if (t == de) + break; + t += MB_METACHARLEN(t); + } + } } } - return down ? 0 : len + 1; + return down ? 0 : slen + 1; } } } @@ -1429,9 +1569,12 @@ getindex(char **pptr, Value v, int dq) } } /* if start was too big, keep the difference */ - start = nstart + (target - p) + startprevlen; + start = nstart + (target - p) + 1; } else { zlong startoff = start + strlen(t); +#ifdef DEBUG + dputs("BUG: can't have negative inverse offsets???"); +#endif if (startoff < 0) { /* invalid: keep index but don't dereference */ start = startoff; |