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authorRich Felker <dalias@aerifal.cx>2011-07-28 21:48:53 -0400
committerRich Felker <dalias@aerifal.cx>2011-07-28 21:48:53 -0400
commitbbdcc403cae440c5f965f0f4c0de1f2d7fd256a7 (patch)
treeeea39bdf70f56aee26ee0c730b1d4d1122e5deab /src/temp
parent649af9f73a84aa45742324d44384a873c8709915 (diff)
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eliminate mk*temp dependency on snprintf
this helps some tiny programs be even more tiny, and barly increases code size even if both are used.
Diffstat (limited to 'src/temp')
-rw-r--r--src/temp/mktemp.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/temp/mktemp.c b/src/temp/mktemp.c
index 654a2794..b04f5dee 100644
--- a/src/temp/mktemp.c
+++ b/src/temp/mktemp.c
@@ -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;
}