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fix false negatives with periodic needles in strstr, wcsstr, and memmem

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in cases where the memorized match range from the right factor
exceeded the length of the left factor, it was wrongly treated as a
mismatch rather than a match.

issue reported by Yves Bastide.
This commit is contained in:
Rich Felker
2014-04-18 17:38:35 -04:00
parent fbeadd150f
commit 476cd1d965
3 changed files with 3 additions and 3 deletions
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2
src/string/wcsstr.c
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@ -84,7 +84,7 @@ static wchar_t *twoway_wcsstr(const wchar_t *h, const wchar_t *n)
}
/* Compare left half */
for (k=ms+1; k>mem && n[k-1] == h[k-1]; k--);
if (k == mem) return (wchar_t *)h;
if (k <= mem) return (wchar_t *)h;
h += p;
mem = mem0;
}