path: root/src
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authorTimo Teräs <>2014-04-09 21:06:17 -0400
committerRich Felker <>2014-04-09 21:06:17 -0400
commit6fbdeff0e51f6afc38fbb1476a4db81322779da4 (patch)
tree9f8efc8cfbdb13ec99fa396bdf68b1d304cedc30 /src
parente94d0692864ecf9522fd6a97610a47a2f718d3de (diff)
fix search past the end of haystack in memmem
to optimize the search, memchr is used to find the first occurrence of the first character of the needle in the haystack before switching to a search for the full needle. however, the number of characters skipped by this first step were not subtracted from the haystack length, causing memmem to search past the end of the haystack.
Diffstat (limited to 'src')
1 files changed, 1 insertions, 0 deletions
diff --git a/src/string/memmem.c b/src/string/memmem.c
index 5211d759..a5a249f2 100644
--- a/src/string/memmem.c
+++ b/src/string/memmem.c
@@ -139,6 +139,7 @@ void *memmem(const void *h0, size_t k, const void *n0, size_t l)
/* Use faster algorithms for short needles */
h = memchr(h0, *n, k);
if (!h || l==1) return (void *)h;
+ k -= h - (const unsigned char *)h0;
if (l==2) return twobyte_memmem(h, k, n);
if (l==3) return threebyte_memmem(h, k, n);
if (l==4) return fourbyte_memmem(h, k, n);