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Remove undefined behaviors

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This commit is contained in:
Justine Tunney 2021-05-16 11:16:28 -07:00
parent 4864565198
commit b3838173ec
51 changed files with 756 additions and 1302 deletions
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8
libc/intrin/pslldq.c
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@ -20,7 +20,7 @@
#include "libc/str/str.h"
/**
* Shifts vector right by n bytes w/ zero-fill.
* Shifts vector left by n bytes w/ zero-fill.
*
* @param a is input vector
* @param b receives output
@ -28,7 +28,9 @@
*/
void(pslldq)(uint8_t b[16], const uint8_t a[16], unsigned long n) {
unsigned i;
uint8_t t[16];
if (n > 16) n = 16;
memmove(b + n, a, 16 - n);
memset(b, 0, n);
for (i = 0; i < n; ++i) t[i] = 0;
for (i = 0; i < 16 - n; ++i) t[n + i] = a[i];
memcpy(b, t, 16);
}