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eliminate mk*temp dependency on snprintf

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this helps some tiny programs be even more tiny, and barly increases
code size even if both are used.
This commit is contained in:
Rich Felker
2011-07-28 21:48:53 -04:00
parent 649af9f73a
commit bbdcc403ca
1 changed files with 4 additions and 3 deletions
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7
src/temp/mktemp.c
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@@ -11,9 +11,9 @@
char *__mktemp(char *template)
{
struct timespec ts;
size_t l = strlen(template);
size_t i, l = strlen(template);
int retries = 10000;
unsigned long r;
unsigned long r, t;
if (l < 6 || strcmp(template+l-6, "XXXXXX")) {
errno = EINVAL;
@@ -23,7 +23,8 @@ char *__mktemp(char *template)
clock_gettime(CLOCK_REALTIME, &ts);
r = ts.tv_nsec + (uintptr_t)&ts / 16 + (uintptr_t)template;
while (retries--) {
snprintf(template+l-6, 7, "%06lX", r & 0xffffff);
for (t=r, i=1; i<=6; i++, t>>=4)
template[l-i] = 'A'+(t&15);
if (access(template, F_OK) < 0) return template;
r = r * 1103515245 + 12345;
}