URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [tags/] [initial/] [uclinux/] [uC-libc/] [getent/] [__getgrent.c] - Rev 1765
Compare with Previous | Blame | View Log
/* * __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; }