123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168 |
- /*
- * __getgrent.c - This file is part of the libc-8086/grp package for ELKS,
- * Copyright (C) 1995, 1996 Nat Friedman <ndf@linux.mit.edu>.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- */
- #include <unistd.h>
- #include <stdlib.h>
- #include <string.h>
- #include <grp.h>
- #include "config.h"
- /*
- * This is the core group-file read function. It behaves exactly like
- * getgrent() except that it is passed a file descriptor. getgrent()
- * is just a wrapper for this function.
- */
- struct group *
- __getgrent(int grp_fd)
- {
- #ifndef GR_SCALE_DYNAMIC
- static char line_buff[GR_MAX_LINE_LEN];
- static char * members[GR_MAX_MEMBERS];
- #else
- static char * line_buff = NULL;
- static char ** members = NULL;
- short line_index;
- short buff_size;
- #endif
- static struct group group;
- register char * ptr;
- char * field_begin;
- short member_num;
- char * endptr;
- int line_len;
- /* We use the restart label to handle malformatted lines */
- restart:
- #ifdef GR_SCALE_DYNAMIC
- line_index=0;
- buff_size=256;
- #endif
- #ifndef GR_SCALE_DYNAMIC
- /* Read the line into the static buffer */
- if ((line_len=read(grp_fd, line_buff, GR_MAX_LINE_LEN))<=0)
- return NULL;
- field_begin=strchr(line_buff, '\n');
- if (field_begin!=NULL)
- lseek(grp_fd, (long) (1+field_begin-(line_buff+line_len)), SEEK_CUR);
- else /* The line is too long - skip it :-\ */
- {
- do { if ((line_len=read(grp_fd, line_buff, GR_MAX_LINE_LEN))<=0)
- return NULL;
- } while (!(field_begin=strchr(line_buff, '\n')));
- lseek(grp_fd, (long) ((field_begin-line_buff)-line_len+1), SEEK_CUR);
- goto restart;
- }
- if (*line_buff=='#' || *line_buff==' ' || *line_buff=='\n' ||
- *line_buff=='\t')
- goto restart;
- *field_begin='\0';
- #else /* !GR_SCALE_DYNAMIC */
- line_buff=realloc(line_buff, buff_size);
- while (1)
- {
- if ((line_len=read(grp_fd, line_buff+line_index,
- buff_size-line_index))<=0)
- return NULL;
- field_begin=strchr(line_buff, '\n');
- if (field_begin!=NULL)
- {
- lseek(grp_fd, (long) (1+field_begin-(line_len+line_index+line_buff)),
- SEEK_CUR);
- *field_begin='\0';
- if (*line_buff=='#' || *line_buff==' ' || *line_buff=='\n' ||
- *line_buff=='\t')
- goto restart;
- break;
- }
- else /* Allocate some more space */
- {
- line_index=buff_size;
- buff_size+=256;
- line_buff=realloc(line_buff, buff_size);
- }
- }
- #endif /* GR_SCALE_DYNAMIC */
- /* Now parse the line */
- group.gr_name=line_buff;
- ptr=strchr(line_buff, ':');
- if (ptr==NULL) goto restart;
- *ptr++='\0';
- group.gr_passwd=ptr;
- ptr=strchr(ptr, ':');
- if (ptr==NULL) goto restart;
- *ptr++='\0';
- field_begin=ptr;
- ptr=strchr(ptr, ':');
- if (ptr==NULL) goto restart;
- *ptr++='\0';
- group.gr_gid=(gid_t) strtoul(field_begin, &endptr, 10);
- if (*endptr!='\0') goto restart;
- member_num=0;
- field_begin=ptr;
- #ifndef GR_SCALE_DYNAMIC
- while ((ptr=strchr(ptr, ','))!=NULL)
- {
- *ptr='\0';
- ptr++;
- members[member_num]=field_begin;
- field_begin=ptr;
- member_num++;
- }
- if (*field_begin=='\0')
- members[member_num]=NULL;
- else
- {
- members[member_num]=field_begin;
- members[member_num+1]=NULL;
- }
- #else /* !GR_SCALE_DYNAMIC */
- if (members!=NULL)
- free (members);
- members=(char **) malloc(1*sizeof(char *));
- while ((ptr=strchr(ptr, ','))!=NULL)
- {
- *ptr='\0';
- ptr++;
- members[member_num]=field_begin;
- field_begin=ptr;
- member_num++;
- members=(char **)realloc((void *)members, (member_num+1)*sizeof(char *));
- }
- if (*field_begin=='\0')
- members[member_num]=NULL;
- else
- {
- members[member_num]=field_begin;
- members[member_num+1]=NULL;
- }
- #endif /* GR_SCALE_DYNAMIC */
- group.gr_mem=members;
- return &group;
- }
|