tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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mktemp.c (4225B)

      1 /*
      2 * Copyright (c) 1987, 1993
      3 *  The Regents of the University of California.  All rights reserved.
      4 *
      5 * Redistribution and use in source and binary forms, with or without
      6 * modification, are permitted provided that the following conditions
      7 * are met:
      8 * 1. Redistributions of source code must retain the above copyright
      9 *    notice, this list of conditions and the following disclaimer.
     10 * 2. Redistributions in binary form must reproduce the above copyright
     11 *    notice, this list of conditions and the following disclaimer in the
     12 *    documentation and/or other materials provided with the distribution.
     13 * 3. ***REMOVED*** - see
     14 *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
     15 * 4. Neither the name of the University nor the names of its contributors
     16 *    may be used to endorse or promote products derived from this software
     17 *    without specific prior written permission.
     18 *
     19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29 * SUCH DAMAGE.
     30 */
     31 
     32 #if defined(LIBC_SCCS) && !defined(lint)
     33 static char sccsid[] = "@(#)mktemp.c    8.1 (Berkeley) 6/4/93";
     34 #endif /* LIBC_SCCS and not lint */
     35 
     36 #ifdef macintosh
     37 #include <unix.h>
     38 #else
     39 #include <sys/types.h>
     40 #include <sys/stat.h>
     41 #endif
     42 #include <fcntl.h>
     43 #include <errno.h>
     44 #include <stdio.h>
     45 #include <ctype.h>
     46 #include "mcom_db.h"
     47 
     48 #ifndef _WINDOWS
     49 #include <unistd.h>
     50 #endif
     51 
     52 #ifdef _WINDOWS
     53 #include <process.h>
     54 #include "winfile.h"
     55 #endif
     56 
     57 static int _gettemp(char *path, register int *doopen, int extraFlags);
     58 
     59 int
     60 mkstemp(char *path)
     61 {
     62    int fd;
     63 
     64    return (_gettemp(path, &fd, 0) ? fd : -1);
     65 }
     66 
     67 int
     68 mkstempflags(char *path, int extraFlags)
     69 {
     70    int fd;
     71 
     72    return (_gettemp(path, &fd, extraFlags) ? fd : -1);
     73 }
     74 
     75 /* NB: This routine modifies its input string, and does not always restore it.
     76 ** returns 1 on success, 0 on failure.
     77 */
     78 static int
     79 _gettemp(char *path, register int *doopen, int extraFlags)
     80 {
     81    register char *start, *trv;
     82    struct stat sbuf;
     83    unsigned int pid;
     84 
     85    pid = getpid();
     86    for (trv = path; *trv; ++trv)
     87        ; /* extra X's get set to 0's */
     88    while (*--trv == 'X') {
     89        *trv = (pid % 10) + '0';
     90        pid /= 10;
     91    }
     92 
     93    /*
     94     * check the target directory; if you have six X's and it
     95     * doesn't exist this runs for a *very* long time.
     96     */
     97    for (start = trv + 1;; --trv) {
     98        char saved;
     99        if (trv <= path)
    100            break;
    101        saved = *trv;
    102        if (saved == '/' || saved == '\\') {
    103            int rv;
    104            *trv = '\0';
    105            rv = stat(path, &sbuf);
    106            *trv = saved;
    107            if (rv)
    108                return (0);
    109            if (!S_ISDIR(sbuf.st_mode)) {
    110                errno = ENOTDIR;
    111                return (0);
    112            }
    113            break;
    114        }
    115    }
    116 
    117    for (;;) {
    118        if (doopen) {
    119            if ((*doopen =
    120                     open(path, O_CREAT | O_EXCL | O_RDWR | extraFlags, 0600)) >= 0)
    121                return (1);
    122            if (errno != EEXIST)
    123                return (0);
    124        } else if (stat(path, &sbuf))
    125            return (errno == ENOENT ? 1 : 0);
    126 
    127        /* tricky little algorithm for backward compatibility */
    128        for (trv = start;;) {
    129            if (!*trv)
    130                return (0);
    131            if (*trv == 'z')
    132                *trv++ = 'a';
    133            else {
    134                if (isdigit((unsigned char)*trv))
    135                    *trv = 'a';
    136                else
    137                    ++*trv;
    138                break;
    139            }
    140        }
    141    }
    142    /*NOTREACHED*/
    143 }