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libc: try to skip memcpy in _gettemp

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(cherry picked from commit b22fdf45ff)
This commit is contained in:
Mateusz Guzik 2021-01-24 05:34:22 +01:00
parent 410994f463
commit 3eae6412b5
1 changed files with 8 additions and 3 deletions
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11
lib/libc/stdio/mktemp.c
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@ -123,6 +123,7 @@ _gettemp(int dfd, char *path, int *doopen, int domkdir, int slen, int oflags)
struct stat sbuf;
uint32_t rand;
char carrybuf[MAXPATHLEN];
int saved;
if ((doopen != NULL && domkdir) || slen < 0 ||
(oflags & ~(O_APPEND | O_DIRECT | O_SHLOCK | O_EXLOCK | O_SYNC |
@ -151,9 +152,7 @@ _gettemp(int dfd, char *path, int *doopen, int domkdir, int slen, int oflags)
}
start = trv + 1;
/* save first combination of random characters */
memcpy(carrybuf, start, suffp - start);
saved = 0;
oflags |= O_CREAT | O_EXCL | O_RDWR;
for (;;) {
if (doopen) {
@ -170,6 +169,12 @@ _gettemp(int dfd, char *path, int *doopen, int domkdir, int slen, int oflags)
} else if (lstat(path, &sbuf))
return (errno == ENOENT);
/* save first combination of random characters */
if (!saved) {
memcpy(carrybuf, start, suffp - start);
saved = 1;
}
/* If we have a collision, cycle through the space of filenames */
for (trv = start, carryp = carrybuf;;) {
/* have we tried all possible permutations? */