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/*
* $Id: tempnam.c,v 1.11 2003/01/23 00:37:02 robertc Exp $
*/
/* A reasonably functional tmpnam. */
/* Originally by Tom Hageman, tom@basil.icce.rug.nl */
/*
* This tmpnam() was changed by Gerben_Wierda@RnA.nl to serve as
* tempnam() for squid-1.1.6. It ignores the directory parameter, every
* temp file is written in /tmp.
*/
#include "config.h"
#if HAVE_LIBC_H
#include <libc.h>
#endif
#if HAVE_STDIO_H
#include <stdio.h>
#endif
#if HAVE_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_LIMITS_H
#include <limits.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#undef TMP_MAX
#define _tmp "/tmp/"
#define lengthof_tmp 5
#ifndef LONG_BIT
#define LONG_BIT (CHAR_BIT * 4) /* assume sizeof(long) == 4 */
#endif
#define L_tmpmin (lengthof_tmp + 5) /* 5 chars for pid. */
#if (L_tmpnam > L_tmpmin)
#if (L_tmpnam > L_tmpmin + LONG_BIT / 6) /* base 64 */
#define TMP_MAX ULONG_MAX
#else
#define TMP_MAX ((1L << (6 * (L_tmpnam - L_tmpmin))) - 1)
#endif
#else
#ifndef L_tmpnam
#error "tmpnam: L_tmpnam undefined"
#else
#error "tmpnam: L_tmpnam too small"
#endif
#endif
static char *
_tmpnam(void)
{
static const char digits[] =
#if (L_tmpnam >= L_tmpmin + LONG_BIT / 4)
"0123456789abcdef";
#define TMP_BASE 16
#else
"0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_-";
#define TMP_BASE 64
#endif
static unsigned long lastcount = 0;
static char buffer[L_tmpnam + 1];
char *s = buffer;
unsigned long count = lastcount;
pid_t pid = getpid();
if (sizeof(_tmp) - 1 != lengthof_tmp)
abort(); /* Consistency error. */
for (;;) {
register int i = L_tmpnam;
register unsigned long c;
register unsigned int p;
/* Build filename. (the hard way) */
s += i;
*s = '\0';
c = (count == TMP_MAX) ? 0 : ++count;
do {
*--s = digits[c % TMP_BASE];
c /= TMP_BASE;
} while (--i > L_tmpmin);
p = (unsigned int) pid;
do {
*--s = digits[p % 10];
p /= 10;
} while (--i > lengthof_tmp);
do {
*--s = _tmp[--i];
} while (i > 0);
/* Check that the file doesn't exist. */
if (access(s, 0) != 0)
break;
/* It exists; retry unless we tried them all. */
if (count == lastcount) {
s = NULL;
break;
}
}
lastcount = count;
return s;
}
char *
tempnam(const char *dir, const char *pfx)
{
return _tmpnam();
}
#ifdef TEST
int
main()
{
char *t;
int n = 0;
while ((t = tempnam(NULL, NULL))) {
printf("%s\n", t);
if (++n == 1000)
break;
}
return 1;
}
#endif
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