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avoid crashing when nel==0 is passed to qsort

This commit is contained in:
Rich Felker 2011-04-29 11:14:55 -04:00
parent def0af1898
commit 1477a3be62
1 changed files with 6 additions and 2 deletions
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8
src/stdlib/qsort.c
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@ -155,12 +155,16 @@ void qsort(void *base, size_t nel, size_t width, cmpfun cmp)
{ {
size_t lp[12*sizeof(size_t)]; size_t lp[12*sizeof(size_t)];
size_t i, size = width * nel; size_t i, size = width * nel;
unsigned char *head = base, unsigned char *head, *high;
*high = head + size - width;
size_t p[2] = {1, 0}; size_t p[2] = {1, 0};
int pshift = 1; int pshift = 1;
int trail; int trail;
if (!size) return;
head = base;
high = head + size - width;
/* Precompute Leonardo numbers, scaled by element width */ /* Precompute Leonardo numbers, scaled by element width */
for(lp[0]=lp[1]=width, i=2; (lp[i]=lp[i-2]+lp[i-1]+width) < size; i++); for(lp[0]=lp[1]=width, i=2; (lp[i]=lp[i-2]+lp[i-1]+width) < size; i++);