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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <unistd.h>
#include "libc.h"
char *tmpnam(char *s)
{
static int lock;
static int index;
static char *s2;
int pid = getpid();
char *dir = getenv("TMPDIR");
if (!s) {
if (!s2) s2 = malloc(L_tmpnam);
s = s2;
}
/* this interface is insecure anyway but at least we can try.. */
if (!dir || strlen(dir) > L_tmpnam-32)
dir = P_tmpdir;
if (access(dir, R_OK|W_OK|X_OK) != 0)
return NULL;
LOCK(&lock);
for (index++; index < TMP_MAX; index++) {
snprintf(s, L_tmpnam, "%s/temp%d-%d", dir, pid, index);
if (access(s, F_OK) != 0) {
UNLOCK(&lock);
return s;
}
}
UNLOCK(&lock);
return NULL;
}
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