167 lines
3.6 KiB
C
167 lines
3.6 KiB
C
/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <ansidecl.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <grp.h>
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/* This is the function that all the others are based on.
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The format of the group file is known only here. */
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/* Structure containing info kept by each __grpread caller. */
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typedef struct
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{
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char *buf;
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size_t buflen;
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size_t max_members;
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char **members;
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struct group g;
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} grpread_info;
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/* Return a chunk of memory containing a pre-initialized `grpread_info'. */
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PTR
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DEFUN_VOID(__grpalloc)
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{
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grpread_info *info = (PTR) malloc (sizeof(grpread_info));
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if (info == NULL)
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return NULL;
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info->buf = NULL;
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info->buflen = 0;
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info->max_members = 5;
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info->members = (char **) malloc (5 * sizeof(char *));
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if (info->members == NULL)
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{
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free ((PTR) info);
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return NULL;
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}
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return info;
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}
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/* Read a group entry from STREAM, filling in G. */
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struct group *
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DEFUN(__grpread, (stream, g), FILE *stream AND PTR CONST g)
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{
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register grpread_info *CONST info = (grpread_info *) g;
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char *start, *end;
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register size_t i;
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/* Idiocy checks. */
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if (stream == NULL)
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{
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errno = EINVAL;
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return NULL;
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}
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do
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if (__getline (&info->buf, &info->buflen, stream) == -1)
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return NULL;
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while (info->buf[0] == '#');
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start = info->buf;
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end = strchr (start, ':');
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if (end == NULL)
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return NULL;
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*end = '\0';
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info->g.gr_name = start;
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start = end + 1;
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end = strchr (start, ':');
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if (end == NULL)
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return NULL;
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*end = '\0';
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info->g.gr_passwd = start;
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info->g.gr_gid = (gid_t) strtol (end + 1, &end, 10);
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if (*end != ':')
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return NULL;
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i = 0;
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do
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{
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start = end + 1;
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end = strchr (start, ',');
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if (end == NULL)
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{
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end = strchr (start, '\n');
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if (end == start)
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break;
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if (end == NULL)
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return NULL;
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*end = '\0';
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end = NULL;
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}
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else
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*end = '\0';
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if (i == info->max_members - 2)
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{
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info->max_members += 5;
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info->members = (char **)
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realloc ((PTR) info->members, info->max_members * sizeof (char *));
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if (info->members == NULL)
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return NULL;
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}
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info->members[i++] = start;
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} while (end != NULL);
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info->members[i] = NULL;
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info->g.gr_mem = info->members;
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return &info->g;
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}
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struct group *
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__grpscan (void **info, int (*selector) (struct group *))
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{
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FILE *stream;
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struct group *p;
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if (*info == NULL)
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{
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*info = __grpalloc ();
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if (info == NULL)
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return NULL;
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}
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stream = __grpopen ();
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if (stream == NULL)
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return NULL;
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p = NULL;
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while (! feof (stream))
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{
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p = __grpread (stream, *info);
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if (p && (*selector) (p))
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break;
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p = NULL;
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}
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(void) fclose (stream);
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return p;
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}
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