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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "libc.h"
char *mktemp(char *template)
{
static int lock;
static int index;
int l = strlen(template);
if (l < 6 || strcmp(template+l-6, "XXXXXX")) {
errno = EINVAL;
return NULL;
}
LOCK(&lock);
for (; index < 1000000; index++) {
snprintf(template+l-6, 6, "%06d", index);
if (access(template, F_OK) != 0) {
UNLOCK(&lock);
return template;
}
}
UNLOCK(&lock);
return NULL;
}
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