Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/userspec.c @ 105:12f81400139d
merge with 3.8.3b
| author | Jim Meyering <jim@meyering.net> |
|---|---|
| date | Wed, 06 Oct 1993 16:44:42 +0000 |
| parents | d9ca5dc520bf |
| children | c74e20573782 |
| rev | line source |
|---|---|
| 5 | 1 /* userspec.c -- Parse a user and group string. |
| 2 Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc. | |
| 3 | |
| 4 This program is free software; you can redistribute it and/or modify | |
| 5 it under the terms of the GNU General Public License as published by | |
| 6 the Free Software Foundation; either version 2, or (at your option) | |
| 7 any later version. | |
| 8 | |
| 9 This program is distributed in the hope that it will be useful, | |
| 10 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 12 GNU General Public License for more details. | |
| 13 | |
| 14 You should have received a copy of the GNU General Public License | |
| 15 along with this program; if not, write to the Free Software | |
| 16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
| 17 | |
| 18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */ | |
| 19 | |
| 105 | 20 #ifdef HAVE_CONFIG_H |
| 21 #if defined (CONFIG_BROKETS) | |
| 22 /* We use <config.h> instead of "config.h" so that a compilation | |
| 23 using -I. -I will use ./config.h rather than /config.h | |
| 24 (which it would do because it found this file in ). */ | |
| 25 #include <config.h> | |
| 26 #else | |
| 27 #include "config.h" | |
| 28 #endif | |
| 29 #endif | |
| 30 | |
| 5 | 31 #include <stdio.h> |
| 32 #include <sys/types.h> | |
| 33 #include <pwd.h> | |
| 34 #include <grp.h> | |
| 35 | |
|
52
d9ca5dc520bf
* system.h [rindex, incl, bcopy, bzero]: Ditto.
Jim Meyering <jim@meyering.net>
parents:
5
diff
changeset
|
36 #if defined(STDC_HEADERS) || defined(HAVE_STRING_H) |
| 5 | 37 #include <string.h> |
|
52
d9ca5dc520bf
* system.h [rindex, incl, bcopy, bzero]: Ditto.
Jim Meyering <jim@meyering.net>
parents:
5
diff
changeset
|
38 #ifndef index |
| 5 | 39 #define index strchr |
|
52
d9ca5dc520bf
* system.h [rindex, incl, bcopy, bzero]: Ditto.
Jim Meyering <jim@meyering.net>
parents:
5
diff
changeset
|
40 #endif |
| 5 | 41 #else |
| 42 #include <strings.h> | |
| 43 #endif | |
| 44 | |
| 45 #ifdef STDC_HEADERS | |
| 46 #include <stdlib.h> | |
| 47 #else | |
| 48 char *malloc (); | |
| 49 #endif | |
| 50 | |
| 51 #ifdef HAVE_UNISTD_H | |
| 52 #include <unistd.h> | |
| 53 #endif | |
| 54 | |
| 55 #ifndef _POSIX_VERSION | |
| 56 struct passwd *getpwnam (); | |
| 57 struct group *getgrnam (); | |
| 58 struct group *getgrgid (); | |
| 59 #endif | |
| 60 | |
| 61 #ifdef _POSIX_SOURCE | |
| 62 #define endpwent() | |
| 63 #define endgrent() | |
| 64 #endif | |
| 65 | |
| 66 #define isdigit(c) ((c) >= '0' && (c) <= '9') | |
| 67 | |
| 68 char *strdup (); | |
| 69 static int isnumber (); | |
| 70 | |
| 71 /* Extract from NAME, which has the form "[user][:.][group]", | |
| 72 a USERNAME, UID U, GROUPNAME, and GID G. | |
| 73 Either user or group, or both, must be present. | |
| 74 If the group is omitted but the ":" or "." separator is given, | |
| 75 use the given user's login group. | |
| 76 | |
| 77 USERNAME and GROUPNAME will be in newly malloc'd memory. | |
| 78 Either one might be NULL instead, indicating that it was not | |
| 79 given and the corresponding numeric ID was left unchanged. | |
| 80 Might write NULs into NAME. | |
| 81 | |
| 82 Return NULL if successful, a static error message string if not. */ | |
| 83 | |
| 84 char * | |
| 85 parse_user_spec (name, uid, gid, username, groupname) | |
| 86 char *name; | |
| 87 uid_t *uid; | |
| 88 gid_t *gid; | |
| 89 char **username, **groupname; | |
| 90 { | |
| 91 static char *tired = "virtual memory exhausted"; | |
| 92 struct passwd *pwd; | |
| 93 struct group *grp; | |
| 94 char *cp; | |
| 95 int use_login_group = 0; | |
| 96 | |
| 97 *username = *groupname = NULL; | |
| 98 | |
| 99 /* Check whether a group is given. */ | |
| 100 cp = index (name, ':'); | |
| 101 if (cp == NULL) | |
| 102 cp = index (name, '.'); | |
| 103 if (cp != NULL) | |
| 104 { | |
| 105 *cp++ = '\0'; | |
| 106 if (*cp == '\0') | |
| 107 { | |
| 108 if (cp == name + 1) | |
| 109 /* Neither user nor group given, just "." or ":". */ | |
| 110 return "can not omit both user and group"; | |
| 111 else | |
| 112 /* "user.". */ | |
| 113 use_login_group = 1; | |
| 114 } | |
| 115 else | |
| 116 { | |
| 117 /* Explicit group. */ | |
| 118 *groupname = strdup (cp); | |
| 119 if (*groupname == NULL) | |
| 120 return tired; | |
| 121 grp = getgrnam (cp); | |
| 122 if (grp == NULL) | |
| 123 { | |
| 124 if (!isnumber (cp)) | |
| 125 return "invalid group"; | |
| 126 *gid = atoi (cp); | |
| 127 } | |
| 128 else | |
| 129 *gid = grp->gr_gid; | |
| 130 endgrent (); /* Save a file descriptor. */ | |
| 131 } | |
| 132 } | |
| 133 | |
| 134 /* Parse the user name, now that any group has been removed. */ | |
| 135 | |
| 136 if (name[0] == '\0') | |
| 137 /* No user name was given, just a group. */ | |
| 138 return NULL; | |
| 139 | |
| 140 *username = strdup (name); | |
| 141 if (*username == NULL) | |
| 142 return tired; | |
| 143 | |
| 144 pwd = getpwnam (name); | |
| 145 if (pwd == NULL) | |
| 146 { | |
| 147 if (!isnumber (name)) | |
| 148 return "invalid user"; | |
| 149 if (use_login_group) | |
| 150 return "cannot get the login group of a numeric UID"; | |
| 151 *uid = atoi (name); | |
| 152 } | |
| 153 else | |
| 154 { | |
| 155 *uid = pwd->pw_uid; | |
| 156 if (use_login_group) | |
| 157 { | |
| 158 *gid = pwd->pw_gid; | |
| 159 grp = getgrgid (pwd->pw_gid); | |
| 160 if (grp == NULL) | |
| 161 { | |
| 162 *groupname = malloc (15); | |
| 163 if (*groupname == NULL) | |
| 164 return tired; | |
| 165 sprintf (*groupname, "%u", pwd->pw_gid); | |
| 166 } | |
| 167 else | |
| 168 { | |
| 169 *groupname = strdup (grp->gr_name); | |
| 170 if (*groupname == NULL) | |
| 171 return tired; | |
| 172 } | |
| 173 endgrent (); | |
| 174 } | |
| 175 } | |
| 176 endpwent (); | |
| 177 return NULL; | |
| 178 } | |
| 179 | |
| 180 /* Return nonzero if STR represents an unsigned decimal integer, | |
| 181 otherwise return 0. */ | |
| 182 | |
| 183 static int | |
| 184 isnumber (str) | |
| 185 char *str; | |
| 186 { | |
| 187 for (; *str; str++) | |
| 188 if (!isdigit (*str)) | |
| 189 return 0; | |
| 190 return 1; | |
| 191 } |