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fix undefined behavior in memset due to missing sequence points

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patch by Pascal Cuoq.
This commit is contained in:
Rich Felker 2017-08-29 19:53:50 -04:00
parent c7f56b4d2f
commit 9d4c902c42
1 changed files with 8 additions and 4 deletions
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12
src/string/memset.c
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@ -11,12 +11,16 @@ void *memset(void *dest, int c, size_t n)
* offsets are well-defined and in the dest region. */
if (!n) return dest;
s[0] = s[n-1] = c;
s[0] = c;
s[n-1] = c;
if (n <= 2) return dest;
s[1] = s[n-2] = c;
s[2] = s[n-3] = c;
s[1] = c;
s[2] = c;
s[n-2] = c;
s[n-3] = c;
if (n <= 6) return dest;
s[3] = s[n-4] = c;
s[3] = c;
s[n-4] = c;
if (n <= 8) return dest;
/* Advance pointer to align it at a 4-byte boundary,