| 1 | /*
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| 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 |
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| 34 | #if defined(LIBC_SCCS) && !defined(lint)
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| 35 | static char sccsid[] = "@(#)mktemp.c 8.1 (Berkeley) 6/4/93";
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| 36 | #endif /* LIBC_SCCS and not lint */
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| 37 |
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| 38 | #include <sys/types.h>
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| 39 | #include <sys/stat.h>
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| 40 | #include <fcntl.h>
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| 41 | #include <errno.h>
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| 42 | #include <stdio.h>
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| 43 | #include <ctype.h>
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| 44 | #include <unistd.h>
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| 45 | #include <stdlib.h>
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| 46 |
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| 47 | static int _gettemp(char*,int*);
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| 48 |
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| 49 | mkstemp(path)
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| 50 | char *path;
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| 51 | {
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| 52 | int fd;
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| 53 |
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| 54 | return (_gettemp(path, &fd) ? fd : -1);
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| 55 | }
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| 56 |
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| 57 | char *
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| 58 | mktemp(path)
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| 59 | char *path;
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| 60 | {
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| 61 | return(_gettemp(path, (int *)NULL) ? path : (char *)NULL);
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| 62 | }
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| 63 |
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| 64 | static
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| 65 | _gettemp(path, doopen)
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| 66 | char *path;
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| 67 | register int *doopen;
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| 68 | {
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| 69 | extern int errno;
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| 70 | register char *start, *trv;
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| 71 | struct stat sbuf;
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| 72 | u_int pid;
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| 73 |
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| 74 | pid = getpid();
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| 75 | for (trv = path; *trv; ++trv); /* extra X's get set to 0's */
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| 76 | while (*--trv == 'X') {
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| 77 | *trv = (pid % 10) + '0';
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| 78 | pid /= 10;
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| 79 | }
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| 80 |
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| 81 | /*
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| 82 | * check the target directory; if you have six X's and it
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| 83 | * doesn't exist this runs for a *very* long time.
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| 84 | */
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| 85 | for (start = trv + 1;; --trv) {
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| 86 | if (trv <= path)
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| 87 | break;
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| 88 | if (*trv == '/') {
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| 89 | *trv = '\0';
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| 90 | if (stat(path, &sbuf))
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| 91 | return(0);
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| 92 | if (!S_ISDIR(sbuf.st_mode)) {
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| 93 | errno = ENOTDIR;
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| 94 | return(0);
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| 95 | }
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| 96 | *trv = '/';
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| 97 | break;
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| 98 | }
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| 99 | }
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| 100 |
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| 101 | for (;;) {
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| 102 | if (doopen) {
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| 103 | if ((*doopen =
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| 104 | open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0)
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| 105 | return(1);
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| 106 | if (errno != EEXIST)
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| 107 | return(0);
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| 108 | }
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| 109 | else if (stat(path, &sbuf))
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| 110 | return(errno == ENOENT ? 1 : 0);
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| 111 |
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| 112 | /* tricky little algorithm for backward compatibility */
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| 113 | for (trv = start;;) {
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| 114 | if (!*trv)
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| 115 | return(0);
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| 116 | if (*trv == 'z')
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| 117 | *trv++ = 'a';
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| 118 | else {
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| 119 | if (isdigit(*trv))
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| 120 | *trv = 'a';
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| 121 | else
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| 122 | ++*trv;
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| 123 | break;
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| 124 | }
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| 125 | }
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| 126 | }
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| 127 | /*NOTREACHED*/
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| 128 | }
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| 129 |
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| 130 | /*
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| 131 | * $PchId: mktemp.c,v 1.3 1995/11/20 19:10:39 philip Exp $
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| 132 | */
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