1: /* Copyright (C) 1991, 1996-1999, 2000 Free Software Foundation, Inc.
    2:    This file is part of the GNU C Library.
    3: 
    4:    The GNU C Library is free software; you can redistribute it and/or
    5:    modify it under the terms of the GNU Lesser General Public
    6:    License as published by the Free Software Foundation; either
    7:    version 2.1 of the License, or (at your option) any later version.
    8: 
    9:    The GNU C Library 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 GNU
   12:    Lesser General Public License for more details.
   13: 
   14:    You should have received a copy of the GNU Lesser General Public
   15:    License along with the GNU C Library; if not, write to the Free
   16:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   17:    02111-1307 USA.  */
   18: 
   19: #include <ctype.h>
   20: #include <errno.h>
   21: #include <grp.h>
   22: #include <stdio.h>
   23: 
   24: #ifdef USE_IN_LIBIO
   25: # include <libio/iolibio.h>
   26: # define flockfile(s) _IO_flockfile (s)
   27: # define funlockfile(s) _IO_funlockfile (s)
   28: #endif
   29: 
   30: /* Define a line parsing function using the common code
   31:    used in the nss_files module.  */
   32: 
   33: #define STRUCTURE       group
   34: #define ENTNAME         grent
   35: struct grent_data {};
   36: 
   37: #define TRAILING_LIST_MEMBER            gr_mem
   38: #define TRAILING_LIST_SEPARATOR_P(c)    ((c) == ',')
   39: #include <nss/nss_files/files-parse.c>
   40: LINE_PARSER
   41: (,
   42:  STRING_FIELD (result->gr_name, ISCOLON, 0);
   43:  if (line[0] == '\0'
   44:      && (result->gr_name[0] == '+' || result->gr_name[0] == '-'))
   45:    {
   46:      result->gr_passwd = NULL;
   47:      result->gr_gid = 0;
   48:    }
   49:  else
   50:    {
   51:      STRING_FIELD (result->gr_passwd, ISCOLON, 0);
   52:      if (result->gr_name[0] == '+' || result->gr_name[0] == '-')
   53:        INT_FIELD_MAYBE_NULL (result->gr_gid, ISCOLON, 0, 10, , 0)
   54:      else
   55:        INT_FIELD (result->gr_gid, ISCOLON, 0, 10,)
   56:    }
   57:  )
   58: 
   59: 
   60: /* Read one entry from the given stream.  */
   61: int
   62: __fgetgrent_r (FILE *stream, struct group *resbuf, char *buffer, size_t buflen,
   63:                struct group **result)
   64: {
   65:   char *p;
   66:   int parse_result;
   67: 
   68:   flockfile (stream);
   69:   do
   70:     {
   71:       buffer[buflen - 1] = '\xff';
   72:       p = fgets_unlocked (buffer, buflen, stream);
   73:       if (__builtin_expect (p == NULL, 0) && feof_unlocked (stream))
   74:         {
   75:           funlockfile (stream);
   76:           *result = NULL;
   77:           __set_errno (ENOENT);
   78:           return errno;
   79:         }
   80:       if (__builtin_expect (p == NULL, 0) || buffer[buflen - 1] != '\xff')
   81:         {
   82:           funlockfile (stream);
   83:           *result = NULL;
   84:           __set_errno (ERANGE);
   85:           return errno;
   86:         }
   87: 
   88:       /* Skip leading blanks.  */
   89:       while (isspace (*p))
   90:         ++p;
   91:     } while (*p == '\0' || *p == '#'    /* Ignore empty and comment lines.  */
   92:              /* Parse the line.  If it is invalid, loop to
   93:                 get the next line of the file to parse.  */
   94:              || ! (parse_result = parse_line (p, resbuf,
   95:                                               (void *) buffer, buflen,
   96:                                               &errno)));
   97: 
   98:   funlockfile (stream);
   99: 
  100:   if (__builtin_expect (parse_result, 0) == -1)
  101:     {
  102:       /* The parser ran out of space.  */
  103:       *result = NULL;
  104:       return errno;
  105:     }
  106: 
  107:   *result = resbuf;
  108:   return 0;
  109: }
  110: weak_alias (__fgetgrent_r, fgetgrent_r)