The Tor Browser: security/nss/lib/dbm/src/mktemp.c@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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  */

    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 */

    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"

    48 #ifndef _WINDOWS

    49 #include <unistd.h>

    50 #endif

    52 #ifdef _WINDOWS

    53 #include <process.h>

    54 #include "winfile.h"

    55 #endif

    57 static int _gettemp(char *path, register int *doopen, int extraFlags);

    59 int

    60 mkstemp(char *path)

    61 {

    62 #ifdef XP_OS2

    63 	FILE *temp = tmpfile();

    65 	return (temp ? fileno(temp) : -1);

    66 #else

    67 	int fd;

    69 	return (_gettemp(path, &fd, 0) ? fd : -1);

    70 #endif

    71 }

    73 int

    74 mkstempflags(char *path, int extraFlags)

    75 {

    76 	int fd;

    78 	return (_gettemp(path, &fd, extraFlags) ? fd : -1);

    79 }

    81 /* NB: This routine modifies its input string, and does not always restore it.

    82 ** returns 1 on success, 0 on failure.

    83 */

    84 static int

    85 _gettemp(char *path, register int *doopen, int extraFlags)

    86 {

    87 	register char *start, *trv;

    88 	struct stat sbuf;

    89 	unsigned int pid;

    91 	pid = getpid();

    92 	for (trv = path; *trv; ++trv);		/* extra X's get set to 0's */

    93 	while (*--trv == 'X') {

    94 		*trv = (pid % 10) + '0';

    95 		pid /= 10;

    96 	}

    98 	/*

    99 	 * check the target directory; if you have six X's and it

   100 	 * doesn't exist this runs for a *very* long time.

   101 	 */

   102 	for (start = trv + 1;; --trv) {

   103 		char saved;

   104 		if (trv <= path)

   105 			break;

   106 		saved = *trv;

   107 		if (saved == '/' || saved == '\\') {

   108 			int rv;

   109 			*trv = '\0';

   110 			rv = stat(path, &sbuf);

   111 			*trv = saved;

   112 			if (rv)

   113 				return(0);

   114 			if (!S_ISDIR(sbuf.st_mode)) {

   115 				errno = ENOTDIR;

   116 				return(0);

   117 			}

   118 			break;

   119 		}

   120 	}

   122 	for (;;) {

   123 		if (doopen) {

   124 			if ((*doopen =

   125 			    open(path, O_CREAT|O_EXCL|O_RDWR|extraFlags, 0600)) >= 0)

   126 				return(1);

   127 			if (errno != EEXIST)

   128 				return(0);

   129 		}

   130 		else if (stat(path, &sbuf))

   131 			return(errno == ENOENT ? 1 : 0);

   133 		/* tricky little algorithm for backward compatibility */

   134 		for (trv = start;;) {

   135 			if (!*trv)

   136 				return(0);

   137 			if (*trv == 'z')

   138 				*trv++ = 'a';

   139 			else {

   140 				if (isdigit(*trv))

   141 					*trv = 'a';

   142 				else

   143 					++*trv;

   144 				break;

   145 			}

   146 		}

   147 	}

   148 	/*NOTREACHED*/

   149 }

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