Mercurial > gnulib
annotate lib/getusershell.c @ 17363:5a51fb7777a9
sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin
Problem reported by Marco Atzeri in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>.
* lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]:
Simply delegate to the system <sys/select.h> in this case too.
Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only
if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to
be needed on Solaris either.
* lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]:
Simply delgate to the system <sys/time.h> in this case.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 19 Mar 2013 09:08:47 -0700 |
| parents | e542fd46ad6f |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
| 9 | 1 /* getusershell.c -- Return names of valid user shells. |
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2 |
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3 Copyright (C) 1991, 1997, 2000-2001, 2003-2006, 2008-2013 Free Software |
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4 Foundation, Inc. |
| 9 | 5 |
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6 This program is free software: you can redistribute it and/or modify |
| 9 | 7 it under the terms of the GNU General Public License as published by |
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8 the Free Software Foundation; either version 3 of the License, or |
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9 (at your option) any later version. |
| 9 | 10 |
| 11 This program is distributed in the hope that it will be useful, | |
| 12 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 GNU General Public License for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
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17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 9 | 18 |
| 19 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> */ | |
| 20 | |
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21 #include <config.h> |
| 125 | 22 |
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23 /* Specification. */ |
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24 #include <unistd.h> |
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25 |
| 9 | 26 #ifndef SHELLS_FILE |
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27 # ifndef __DJGPP__ |
| 9 | 28 /* File containing a list of nonrestricted shells, one per line. */ |
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29 # define SHELLS_FILE "/etc/shells" |
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30 # else |
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31 /* This is a horrible kludge. Isn't there a better way? */ |
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32 # define SHELLS_FILE "/dev/env/DJDIR/etc/shells" |
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33 # endif |
| 9 | 34 #endif |
| 35 | |
| 4655 | 36 #include <stdlib.h> |
| 9 | 37 #include <ctype.h> |
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38 |
| 6275 | 39 #include "stdio--.h" |
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40 #include "xalloc.h" |
| 9 | 41 |
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42 #if USE_UNLOCKED_IO |
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43 # include "unlocked-io.h" |
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44 #endif |
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45 |
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46 static size_t readname (char **, size_t *, FILE *); |
| 9 | 47 |
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48 #if ! defined ADDITIONAL_DEFAULT_SHELLS && defined __MSDOS__ |
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49 # define ADDITIONAL_DEFAULT_SHELLS \ |
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50 "c:/dos/command.com", "c:/windows/command.com", "c:/command.com", |
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51 #else |
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52 # define ADDITIONAL_DEFAULT_SHELLS /* empty */ |
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53 #endif |
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54 |
| 9 | 55 /* List of shells to use if the shells file is missing. */ |
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56 static char const* const default_shells[] = |
| 9 | 57 { |
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58 ADDITIONAL_DEFAULT_SHELLS |
| 9 | 59 "/bin/sh", "/bin/csh", "/usr/bin/sh", "/usr/bin/csh", NULL |
| 60 }; | |
| 61 | |
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62 /* Index of the next shell in 'default_shells' to return. |
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63 0 means we are not using 'default_shells'. */ |
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64 static size_t default_index = 0; |
| 9 | 65 |
| 66 /* Input stream from the shells file. */ | |
| 67 static FILE *shellstream = NULL; | |
| 68 | |
| 69 /* Line of input from the shells file. */ | |
| 70 static char *line = NULL; | |
| 71 | |
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72 /* Number of bytes allocated for 'line'. */ |
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73 static size_t line_size = 0; |
| 9 | 74 |
| 75 /* Return an entry from the shells file, ignoring comment lines. | |
| 167 | 76 If the file doesn't exist, use the list in DEFAULT_SHELLS (above). |
| 77 In any case, the returned string is in memory allocated through malloc. | |
| 9 | 78 Return NULL if there are no more entries. */ |
| 79 | |
| 80 char * | |
| 4655 | 81 getusershell (void) |
| 9 | 82 { |
| 83 if (default_index > 0) | |
| 84 { | |
| 85 if (default_shells[default_index]) | |
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86 /* Not at the end of the list yet. */ |
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87 return xstrdup (default_shells[default_index++]); |
| 9 | 88 return NULL; |
| 89 } | |
| 90 | |
| 91 if (shellstream == NULL) | |
| 92 { | |
| 6275 | 93 shellstream = fopen (SHELLS_FILE, "r"); |
| 9 | 94 if (shellstream == NULL) |
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95 { |
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96 /* No shells file. Use the default list. */ |
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97 default_index = 1; |
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98 return xstrdup (default_shells[0]); |
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99 } |
| 9 | 100 } |
| 101 | |
| 102 while (readname (&line, &line_size, shellstream)) | |
| 103 { | |
| 104 if (*line != '#') | |
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105 return line; |
| 9 | 106 } |
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107 return NULL; /* End of file. */ |
| 9 | 108 } |
| 109 | |
| 110 /* Rewind the shells file. */ | |
| 111 | |
| 112 void | |
| 4655 | 113 setusershell (void) |
| 9 | 114 { |
| 115 default_index = 0; | |
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116 if (shellstream) |
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117 rewind (shellstream); |
| 9 | 118 } |
| 119 | |
| 120 /* Close the shells file. */ | |
| 121 | |
| 122 void | |
| 4655 | 123 endusershell (void) |
| 9 | 124 { |
| 125 if (shellstream) | |
| 126 { | |
| 127 fclose (shellstream); | |
| 128 shellstream = NULL; | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 /* Read a line from STREAM, removing any newline at the end. | |
| 133 Place the result in *NAME, which is malloc'd | |
| 134 and/or realloc'd as necessary and can start out NULL, | |
| 135 and whose size is passed and returned in *SIZE. | |
| 136 | |
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137 Return the number of bytes placed in *NAME |
| 9 | 138 if some nonempty sequence was found, otherwise 0. */ |
| 139 | |
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140 static size_t |
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141 readname (char **name, size_t *size, FILE *stream) |
| 9 | 142 { |
| 143 int c; | |
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144 size_t name_index = 0; |
| 9 | 145 |
| 146 /* Skip blank space. */ | |
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147 while ((c = getc (stream)) != EOF && isspace (c)) |
| 9 | 148 /* Do nothing. */ ; |
| 790 | 149 |
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150 for (;;) |
| 9 | 151 { |
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152 if (*size <= name_index) |
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153 *name = x2nrealloc (*name, size, sizeof **name); |
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154 if (c == EOF || isspace (c)) |
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155 break; |
| 9 | 156 (*name)[name_index++] = c; |
| 157 c = getc (stream); | |
| 158 } | |
| 159 (*name)[name_index] = '\0'; | |
| 160 return name_index; | |
| 161 } | |
| 162 | |
| 163 #ifdef TEST | |
| 4655 | 164 int |
| 165 main (void) | |
| 9 | 166 { |
| 167 char *s; | |
| 168 | |
| 169 while (s = getusershell ()) | |
| 170 puts (s); | |
| 171 exit (0); | |
| 172 } | |
| 173 #endif |