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Fix how regex substitution works with empty matches.

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This commit is contained in:
nicm 2019-06-20 15:40:14 +00:00
parent fc1df91e03
commit f4e835754c
1 changed files with 26 additions and 9 deletions
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31
regsub.c
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@ -63,7 +63,8 @@ regsub(const char *pattern, const char *with, const char *text, int flags)
{ {
regex_t r; regex_t r;
regmatch_t m[10]; regmatch_t m[10];
size_t start, end, len = 0; ssize_t start, end, last, len = 0;
int empty = 0;
char *buf = NULL; char *buf = NULL;
if (*text == '\0') if (*text == '\0')
@ -72,9 +73,10 @@ regsub(const char *pattern, const char *with, const char *text, int flags)
return (NULL); return (NULL);
start = 0; start = 0;
last = 0;
end = strlen(text); end = strlen(text);
while (start != end) { while (start <= end) {
m[0].rm_so = start; m[0].rm_so = start;
m[0].rm_eo = end; m[0].rm_eo = end;
@ -82,14 +84,29 @@ regsub(const char *pattern, const char *with, const char *text, int flags)
regsub_copy(&buf, &len, text, start, end); regsub_copy(&buf, &len, text, start, end);
break; break;
} }
if (m[0].rm_so == m[0].rm_eo) {
regsub_copy(&buf, &len, text, start, end);
break;
}
regsub_copy(&buf, &len, text, start, m[0].rm_so); /*
* Append any text not part of this match (from the end of the
* last match).
*/
regsub_copy(&buf, &len, text, last, m[0].rm_so);
/*
* If the last match was empty and this one isn't (it is either
* later or has matched text), expand this match. If it is
* empty, move on one character and try again from there.
*/
if (empty || m[0].rm_so != last || m[0].rm_so != m[0].rm_eo) {
regsub_expand(&buf, &len, with, text, m, nitems(m)); regsub_expand(&buf, &len, with, text, m, nitems(m));
last = m[0].rm_eo;
start = m[0].rm_eo; start = m[0].rm_eo;
empty = 0;
} else {
last = m[0].rm_eo;
start = m[0].rm_eo + 1;
empty = 1;
}
} }
buf[len] = '\0'; buf[len] = '\0';