scoutos / prex-0.9.0 / usr / lib / libc / stdio / mktemp.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*
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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. Neither the name of the University nor the names of its contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #include <sys/types.h> |
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31 | #include <sys/stat.h> |
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32 | #include <fcntl.h> |
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33 | #include <errno.h> |
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34 | #include <stdio.h> |
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35 | #include <ctype.h> |
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36 | #include <unistd.h> |
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37 | |||
38 | static int _gettemp(char *, int *); |
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39 | |||
40 | int
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41 | mkstemp(path) |
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42 | char *path;
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43 | { |
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44 | int fd;
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45 | |||
46 | return (_gettemp(path, &fd) ? fd : -1); |
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47 | } |
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48 | |||
49 | char *
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50 | mktemp(path) |
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51 | char *path;
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52 | { |
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53 | return(_gettemp(path, (int *)NULL) ? path : (char *)NULL); |
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54 | } |
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55 | |||
56 | static int |
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57 | _gettemp(path, doopen) |
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58 | char *path;
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59 | int *doopen;
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60 | { |
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61 | extern int errno; |
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62 | char *start, *trv;
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63 | struct stat sbuf;
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64 | u_int pid; |
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65 | |||
66 | pid = getpid(); |
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67 | for (trv = path; *trv; ++trv); /* extra X's get set to 0's */ |
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68 | while (*--trv == 'X') { |
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69 | *trv = (pid % 10) + '0'; |
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70 | pid /= 10;
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71 | } |
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72 | |||
73 | /*
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74 | * check the target directory; if you have six X's and it
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75 | * doesn't exist this runs for a *very* long time.
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76 | */
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77 | for (start = trv + 1;; --trv) { |
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78 | if (trv <= path)
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79 | break;
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80 | if (*trv == '/') { |
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81 | *trv = '\0';
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82 | if (stat(path, &sbuf))
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83 | return(0); |
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84 | if (!S_ISDIR(sbuf.st_mode)) {
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85 | errno = ENOTDIR; |
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86 | return(0); |
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87 | } |
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88 | *trv = '/';
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89 | break;
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90 | } |
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91 | } |
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92 | |||
93 | for (;;) {
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94 | if (doopen) {
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95 | if ((*doopen =
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96 | open(path, O_CREAT|O_EXCL|O_RDWR, 0600)) >= 0) |
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97 | return(1); |
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98 | if (errno != EEXIST)
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99 | return(0); |
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100 | } |
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101 | else if (stat(path, &sbuf)) |
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102 | return(errno == ENOENT ? 1 : 0); |
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103 | |||
104 | /* tricky little algorithm for backward compatibility */
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105 | for (trv = start;;) {
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106 | if (!*trv)
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107 | return(0); |
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108 | if (*trv == 'z') |
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109 | *trv++ = 'a';
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110 | else {
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111 | if (isdigit((unsigned char)*trv)) |
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112 | *trv = 'a';
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113 | else
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114 | ++*trv; |
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115 | break;
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116 | } |
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117 | } |
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118 | } |
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119 | /*NOTREACHED*/
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120 | } |