#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#ifdef HAVE_STDLIB_H
# include <stdlib.h>
#endif
#include <ctype.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "sudo.h"
#ifndef lint
static const char rcsid[] = "$Sudo: mkstemp.c,v 1.2 2008/08/20 11:40:15 millert Exp $";
#endif
static unsigned int get_random __P((void));
static void seed_random __P((void));
int
mkstemp(path)
char *path;
{
char *start, *cp;
int fd, r;
char *alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
if (*path == '\0') {
errno = EINVAL;
return(0);
}
for (cp = path; *cp; cp++)
;
do {
cp--;
} while (cp >= path && *cp == 'X');
start = cp + 1;
for (;;) {
for (cp = start; *cp; cp++) {
r = get_random % (26 + 26);
*cp = alphabet[r];
}
fd = open(path, O_CREAT|O_EXCL|O_RDWR, S_IRUSR|S_IWUSR);
if (fd != -1 || errno != EEXIST)
return(fd);
}
}
#ifdef HAVE_RANDOM
# define RAND random
# define SRAND srandom
# define SEED_T unsigned int
#else
# ifdef HAVE_LRAND48
# define RAND lrand48
# define SRAND srand48
# define SEED_T long
# else
# define RAND rand
# define SRAND srand
# define SEED_T unsigned int
# endif
#endif
static void
seed_random()
{
SEED_T seed;
struct timespec ts;
(void) gettime(&ts);
seed = (ts.tv_sec % 10000) * 523 + ts.tv_nsec / 1000 * 13 +
(getpid() % 1000) * 983;
SRAND(seed);
}
static unsigned int
get_random()
{
static int initialized;
if (!initialized) {
seed_random();
initialized = 1;
}
return(RAND() & 0xffffffff);
}