Mercurial > hg > octave-kai > gnulib-hg
annotate lib/getusershell.c @ 7302:8a1a9361108c
* _fpending.c: Include <config.h> unconditionally, since we no
longer worry about uses that don't define HAVE_CONFIG_H.
* acl.c, alloca.c, argmatch.c, atexit.c, backupfile.c:
* basename.c, c-stack.c, c-strtod.c, calloc.c, canon-host.c:
* canonicalize.c, chdir-long.c, chdir-safer.c, chown.c:
* cloexec.c, close-stream.c, closeout.c, creat-safer.c:
* cycle-check.c, diacrit.c, dirchownmod.c, dirfd.c, dirname.c:
* dup-safer.c, dup2.c, error.c, euidaccess.c, exclude.c:
* exitfail.c, fchmodat.c, fchown-stub.c, fd-safer.c:
* file-type.c, fileblocks.c, filemode.c, filenamecat.c:
* fnmatch.c, fopen-safer.c, fprintftime.c, free.c, fsusage.c:
* ftruncate.c, fts-cycle.c, fts.c, full-write.c, gai_strerror.c:
* getcwd.c, getdate.y, getdomainname.c, getgroups.c:
* gethostname.c, gethrxtime.c, getloadavg.c, getlogin_r.c:
* getndelim2.c, getnline.c, getopt.c, getopt1.c, getpass.c:
* gettime.c, gettimeofday.c, getugroups.c, getusershell.c:
* glob.c, group-member.c, hard-locale.c, hash-pjw.c, hash.c:
* human.c, idcache.c, inet_ntop.c, inet_pton.c, inttostr.c:
* isdir.c, lchown.c, linebuffer.c, long-options.c, lstat.c:
* malloc.c, md5.c, memcasecmp.c, memchr.c, memcmp.c, memcoll.c:
* memcpy.c, memmove.c, memrchr.c, mkancesdirs.c, mkdir-p.c:
* mkdir.c, mkdirat.c, mkstemp-safer.c, mkstemp.c, modechange.c:
* mountlist.c, nanosleep.c, obstack.c, open-safer.c:
* openat-die.c, openat.c, pagealign_alloc.c, physmem.c:
* pipe-safer.c, posixtm.c, posixver.c, putenv.c, quote.c:
* quotearg.c, raise.c, readtokens.c, readtokens0.c, readutmp.c:
* realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c, safe-read.c:
* same.c, save-cwd.c, savedir.c, setenv.c, settime.c, sha1.c:
* sig2str.c, snprintf.c, strdup.c, strerror.c, strftime.c:
* stripslash.c, strndup.c, strnlen.c, strpbrk.c, strtod.c:
* strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c:
* timegm.c, tmpfile-safer.c, unlinkdir.c, userspec.c, utime.c:
* utimecmp.c, utimens.c, version-etc-fsf.c, version-etc.c:
* xalloc-die.c, xgetcwd.c, xgethostname.c, xmalloc.c:
* xmemcoll.c, xnanosleep.c, xreadlink.c, xstrtod.c:
* xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c:
Likewise.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Wed, 13 Sep 2006 22:38:14 +0000 |
| parents | fa896bb33133 |
| children | bbbbbf4cd1c5 |
| 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, 2004, 2005, 2006 Free |
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4 Software Foundation, Inc. |
| 9 | 5 |
| 6 This program is free software; you can redistribute it and/or modify | |
| 7 it under the terms of the GNU General Public License as published by | |
| 8 the Free Software Foundation; either version 2, or (at your option) | |
| 9 any later version. | |
| 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, write to the Free Software Foundation, |
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18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ |
| 9 | 19 |
| 20 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> */ | |
| 21 | |
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22 #include <config.h> |
| 125 | 23 |
| 9 | 24 #ifndef SHELLS_FILE |
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25 # ifndef __DJGPP__ |
| 9 | 26 /* File containing a list of nonrestricted shells, one per line. */ |
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27 # define SHELLS_FILE "/etc/shells" |
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28 # else |
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29 /* This is a horrible kludge. Isn't there a better way? */ |
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30 # define SHELLS_FILE "/dev/env/DJDIR/etc/shells" |
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31 # endif |
| 9 | 32 #endif |
| 33 | |
| 4655 | 34 #include <stdlib.h> |
| 9 | 35 #include <ctype.h> |
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36 |
| 6275 | 37 #include "stdio--.h" |
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38 #include "xalloc.h" |
| 9 | 39 |
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40 #if USE_UNLOCKED_IO |
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41 # include "unlocked-io.h" |
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42 #endif |
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43 |
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44 static size_t readname (char **, size_t *, FILE *); |
| 9 | 45 |
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46 #if ! defined ADDITIONAL_DEFAULT_SHELLS && defined __MSDOS__ |
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47 # define ADDITIONAL_DEFAULT_SHELLS \ |
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48 "c:/dos/command.com", "c:/windows/command.com", "c:/command.com", |
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49 #else |
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50 # define ADDITIONAL_DEFAULT_SHELLS /* empty */ |
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51 #endif |
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52 |
| 9 | 53 /* List of shells to use if the shells file is missing. */ |
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54 static char const* const default_shells[] = |
| 9 | 55 { |
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56 ADDITIONAL_DEFAULT_SHELLS |
| 9 | 57 "/bin/sh", "/bin/csh", "/usr/bin/sh", "/usr/bin/csh", NULL |
| 58 }; | |
| 59 | |
| 60 /* Index of the next shell in `default_shells' to return. | |
| 61 0 means we are not using `default_shells'. */ | |
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62 static size_t default_index = 0; |
| 9 | 63 |
| 64 /* Input stream from the shells file. */ | |
| 65 static FILE *shellstream = NULL; | |
| 66 | |
| 67 /* Line of input from the shells file. */ | |
| 68 static char *line = NULL; | |
| 69 | |
| 70 /* Number of bytes allocated for `line'. */ | |
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71 static size_t line_size = 0; |
| 9 | 72 |
| 73 /* Return an entry from the shells file, ignoring comment lines. | |
| 167 | 74 If the file doesn't exist, use the list in DEFAULT_SHELLS (above). |
| 75 In any case, the returned string is in memory allocated through malloc. | |
| 9 | 76 Return NULL if there are no more entries. */ |
| 77 | |
| 78 char * | |
| 4655 | 79 getusershell (void) |
| 9 | 80 { |
| 81 if (default_index > 0) | |
| 82 { | |
| 83 if (default_shells[default_index]) | |
| 84 /* Not at the end of the list yet. */ | |
| 167 | 85 return xstrdup (default_shells[default_index++]); |
| 9 | 86 return NULL; |
| 87 } | |
| 88 | |
| 89 if (shellstream == NULL) | |
| 90 { | |
| 6275 | 91 shellstream = fopen (SHELLS_FILE, "r"); |
| 9 | 92 if (shellstream == NULL) |
| 93 { | |
| 94 /* No shells file. Use the default list. */ | |
| 95 default_index = 1; | |
| 167 | 96 return xstrdup (default_shells[0]); |
| 9 | 97 } |
| 98 } | |
| 99 | |
| 100 while (readname (&line, &line_size, shellstream)) | |
| 101 { | |
| 102 if (*line != '#') | |
| 103 return line; | |
| 104 } | |
| 105 return NULL; /* End of file. */ | |
| 106 } | |
| 107 | |
| 108 /* Rewind the shells file. */ | |
| 109 | |
| 110 void | |
| 4655 | 111 setusershell (void) |
| 9 | 112 { |
| 113 default_index = 0; | |
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114 if (shellstream) |
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115 rewind (shellstream); |
| 9 | 116 } |
| 117 | |
| 118 /* Close the shells file. */ | |
| 119 | |
| 120 void | |
| 4655 | 121 endusershell (void) |
| 9 | 122 { |
| 123 if (shellstream) | |
| 124 { | |
| 125 fclose (shellstream); | |
| 126 shellstream = NULL; | |
| 127 } | |
| 128 } | |
| 129 | |
| 130 /* Read a line from STREAM, removing any newline at the end. | |
| 131 Place the result in *NAME, which is malloc'd | |
| 132 and/or realloc'd as necessary and can start out NULL, | |
| 133 and whose size is passed and returned in *SIZE. | |
| 134 | |
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135 Return the number of bytes placed in *NAME |
| 9 | 136 if some nonempty sequence was found, otherwise 0. */ |
| 137 | |
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138 static size_t |
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139 readname (char **name, size_t *size, FILE *stream) |
| 9 | 140 { |
| 141 int c; | |
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142 size_t name_index = 0; |
| 9 | 143 |
| 144 /* Skip blank space. */ | |
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145 while ((c = getc (stream)) != EOF && isspace (c)) |
| 9 | 146 /* Do nothing. */ ; |
| 790 | 147 |
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148 for (;;) |
| 9 | 149 { |
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150 if (*size <= name_index) |
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151 *name = x2nrealloc (*name, size, sizeof **name); |
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152 if (c == EOF || isspace (c)) |
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153 break; |
| 9 | 154 (*name)[name_index++] = c; |
| 155 c = getc (stream); | |
| 156 } | |
| 157 (*name)[name_index] = '\0'; | |
| 158 return name_index; | |
| 159 } | |
| 160 | |
| 161 #ifdef TEST | |
| 4655 | 162 int |
| 163 main (void) | |
| 9 | 164 { |
| 165 char *s; | |
| 166 | |
| 167 while (s = getusershell ()) | |
| 168 puts (s); | |
| 169 exit (0); | |
| 170 } | |
| 171 #endif |