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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2 | pj | 1 | /* |
| 2 | * Copyright (c) 1987, 1993 |
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| 3 | * The Regents of the University of California. All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * 1. Redistributions of source code must retain the above copyright |
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| 9 | * notice, this list of conditions and the following disclaimer. |
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 11 | * notice, this list of conditions and the following disclaimer in the |
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| 12 | * documentation and/or other materials provided with the distribution. |
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| 13 | * 3. All advertising materials mentioning features or use of this software |
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| 14 | * must display the following acknowledgement: |
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| 15 | * This product includes software developed by the University of |
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| 16 | * California, Berkeley and its contributors. |
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| 17 | * 4. Neither the name of the University nor the names of its contributors |
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| 18 | * may be used to endorse or promote products derived from this software |
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| 19 | * without specific prior written permission. |
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| 20 | * |
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 31 | * SUCH DAMAGE. |
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| 32 | */ |
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| 33 | |||
| 34 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 35 | #if 0 |
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| 36 | static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93"; |
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| 37 | #endif |
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| 38 | static const char rcsid[] = |
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| 39 | "$\Id: mktemp.c,v 1.4.2.1 1997/04/07 18:03:25 guido Exp $"; |
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| 40 | #endif /* LIBC_SCCS and not lint */ |
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| 41 | |||
| 42 | #include <sys/types.h> |
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| 43 | #include <sys/stat.h> |
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| 44 | #include <fcntl.h> |
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| 45 | #include <errno.h> |
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| 46 | #include <stdio.h> |
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| 47 | #include <ctype.h> |
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| 48 | #include <unistd.h> |
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| 49 | |||
| 50 | static int _gettemp(char *, int *); |
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| 51 | |||
| 52 | int |
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| 53 | mkstemp(path) |
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| 54 | char *path; |
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| 55 | { |
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| 56 | int fd; |
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| 57 | |||
| 58 | return (_gettemp(path, &fd) ? fd : -1); |
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| 59 | } |
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| 60 | |||
| 61 | char * |
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| 62 | mktemp(path) |
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| 63 | char *path; |
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| 64 | { |
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| 65 | return(_gettemp(path, (int *)NULL) ? path : (char *)NULL); |
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| 66 | } |
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| 67 | |||
| 68 | static int |
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| 69 | _gettemp(path, doopen) |
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| 70 | char *path; |
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| 71 | register int *doopen; |
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| 72 | { |
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| 73 | register char *start, *trv; |
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| 74 | struct stat sbuf; |
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| 75 | pid_t pid; |
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| 76 | |||
| 77 | pid = getpid(); |
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| 78 | for (trv = path; *trv; ++trv); /* extra X's get set to 0's */ |
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| 79 | while (*--trv == 'X') { |
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| 80 | *trv = (pid % 10) + '0'; |
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| 81 | pid /= 10; |
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| 82 | } |
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| 83 | |||
| 84 | /* |
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| 85 | * check the target directory; if you have six X's and it |
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| 86 | * doesn't exist this runs for a *very* long time. |
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| 87 | */ |
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| 88 | for (start = trv + 1;; --trv) { |
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| 89 | if (trv <= path) |
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| 90 | break; |
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| 91 | if (*trv == '/') { |
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| 92 | *trv = '\0'; |
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| 93 | if (stat(path, &sbuf)) |
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| 94 | return(0); |
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| 95 | if (!S_ISDIR(sbuf.st_mode)) { |
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| 96 | errno = ENOTDIR; |
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| 97 | return(0); |
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| 98 | } |
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| 99 | *trv = '/'; |
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| 100 | break; |
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| 101 | } |
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| 102 | } |
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| 103 | |||
| 104 | for (;;) { |
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| 105 | if (doopen) { |
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| 106 | if ((*doopen = |
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| 107 | open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) |
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| 108 | return(1); |
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| 109 | if (errno != EEXIST) |
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| 110 | return(0); |
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| 111 | } |
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| 112 | else if (lstat(path, &sbuf)) |
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| 113 | return(errno == ENOENT ? 1 : 0); |
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| 114 | |||
| 115 | /* tricky little algorithm for backward compatibility */ |
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| 116 | for (trv = start;;) { |
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| 117 | if (!*trv) |
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| 118 | return(0); |
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| 119 | if (*trv == 'z') |
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| 120 | *trv++ = 'a'; |
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| 121 | else { |
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| 122 | if (isdigit(*trv)) |
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| 123 | *trv = 'a'; |
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| 124 | else |
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| 125 | ++*trv; |
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| 126 | break; |
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| 127 | } |
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| 128 | } |
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| 129 | } |
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| 130 | /*NOTREACHED*/ |
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| 131 | } |