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remove ugly prng from mk*temp and just re-poll time on retry

This commit is contained in:
Rich Felker 2011-07-28 22:03:54 -04:00
parent bbdcc403ca
commit aed707f679
1 changed files with 5 additions and 6 deletions
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9
src/temp/mktemp.c
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@ -13,20 +13,19 @@ char *__mktemp(char *template)
struct timespec ts; struct timespec ts;
size_t i, l = strlen(template); size_t i, l = strlen(template);
int retries = 10000; int retries = 10000;
unsigned long r, t; unsigned long r;
if (l < 6 || strcmp(template+l-6, "XXXXXX")) { if (l < 6 || strcmp(template+l-6, "XXXXXX")) {
errno = EINVAL; errno = EINVAL;
*template = 0; *template = 0;
return template; return template;
} }
while (retries--) {
clock_gettime(CLOCK_REALTIME, &ts); clock_gettime(CLOCK_REALTIME, &ts);
r = ts.tv_nsec + (uintptr_t)&ts / 16 + (uintptr_t)template; r = ts.tv_nsec + (uintptr_t)&ts / 16 + (uintptr_t)template;
while (retries--) { for (i=1; i<=6; i++, r>>=4)
for (t=r, i=1; i<=6; i++, t>>=4) template[l-i] = 'A'+(r&15);
template[l-i] = 'A'+(t&15);
if (access(template, F_OK) < 0) return template; if (access(template, F_OK) < 0) return template;
r = r * 1103515245 + 12345;
} }
*template = 0; *template = 0;
errno = EEXIST; errno = EEXIST;