#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/stdio/mktemp.c,v 1.28 2003/02/16 17:29:10 nectar Exp $");
#include "namespace.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/syslimits.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include "un-namespace.h"
char *_mktemp(char *);
static int _gettemp(char *, int *, int, int);
static const unsigned char padchar[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
int
mkstemps(path, slen)
char *path;
int slen;
{
int fd;
return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}
int
mkstemp(path)
char *path;
{
int fd;
return (_gettemp(path, &fd, 0, 0) ? fd : -1);
}
char *
mkdtemp(path)
char *path;
{
return (_gettemp(path, (int *)NULL, 1, 0) ? path : (char *)NULL);
}
char *
_mktemp(path)
char *path;
{
return (_gettemp(path, (int *)NULL, 0, 0) ? path : (char *)NULL);
}
__warn_references(mktemp,
"warning: mktemp() possibly used unsafely; consider using mkstemp()");
char *
mktemp(path)
char *path;
{
return (_mktemp(path));
}
static int
_gettemp(path, doopen, domkdir, slen)
char *path;
int *doopen;
int domkdir;
int slen;
{
char *start, *trv, *suffp, *carryp;
char *pad;
struct stat sbuf;
int rval;
uint32_t rand;
char carrybuf[NAME_MAX];
if ((doopen != NULL && domkdir) || slen < 0) {
errno = EINVAL;
return (0);
}
for (trv = path; *trv != '\0'; ++trv)
;
trv -= slen;
suffp = trv;
--trv;
if (trv < path || NULL != strchr(suffp, '/')) {
errno = EINVAL;
return (0);
}
while (trv >= path && *trv == 'X') {
rand = arc4random() % (sizeof(padchar) - 1);
*trv-- = padchar[rand];
}
start = trv + 1;
memcpy(carrybuf, start, suffp - start);
if (doopen != NULL || domkdir) {
for (; trv > path; --trv) {
if (*trv == '/') {
*trv = '\0';
rval = stat(path, &sbuf);
*trv = '/';
if (rval != 0)
return (0);
if (!S_ISDIR(sbuf.st_mode)) {
errno = ENOTDIR;
return (0);
}
break;
}
}
}
for (;;) {
if (doopen) {
if ((*doopen =
_open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
return (1);
if (errno != EEXIST)
return (0);
} else if (domkdir) {
if (mkdir(path, 0700) == 0)
return (1);
if (errno != EEXIST)
return (0);
} else if (lstat(path, &sbuf))
return (errno == ENOENT);
for (trv = start, carryp = carrybuf;;) {
if (trv == suffp)
return (0);
pad = strchr(padchar, *trv);
if (pad == NULL) {
errno = EIO;
return (0);
}
*trv = (*++pad == '\0') ? padchar[0] : *pad;
if (*trv == *carryp) {
++trv;
++carryp;
} else {
break;
}
}
}
}