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      1 /* Reading file lists.
      2    Copyright (C) 1995-1998, 2000-2002 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 Foundation,
     16    Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
     17 
     18 #ifdef HAVE_CONFIG_H
     19 # include "config.h"
     20 #endif
     21 
     22 /* Specification.  */
     23 #include "file-list.h"
     24 
     25 #include <errno.h>
     26 #include <stdio.h>
     27 #include <stdlib.h>
     28 #include <string.h>
     29 
     30 #include "str-list.h"
     31 #include "error.h"
     32 #include "exit.h"
     33 #include "getline.h"
     34 #include "gettext.h"
     35 
     36 /* A convenience macro.  I don't like writing gettext() every time.  */
     37 #define _(str) gettext (str)
     38 
     39 
     40 /* Read list of filenames from a file.  */
     41 string_list_ty *
     42 read_names_from_file (const char *file_name)
     43 {
     44   size_t line_len = 0;
     45   char *line_buf = NULL;
     46   FILE *fp;
     47   string_list_ty *result;
     48 
     49   if (strcmp (file_name, "-") == 0)
     50     fp = stdin;
     51   else
     52     {
     53       fp = fopen (file_name, "r");
     54       if (fp == NULL)
     55 	error (EXIT_FAILURE, errno,
     56 	       _("error while opening \"%s\" for reading"), file_name);
     57     }
     58 
     59   result = string_list_alloc ();
     60 
     61   while (!feof (fp))
     62     {
     63       /* Read next line from file.  */
     64       int len = getline (&line_buf, &line_len, fp);
     65 
     66       /* In case of an error leave loop.  */
     67       if (len < 0)
     68 	break;
     69 
     70       /* Remove trailing '\n' and trailing whitespace.  */
     71       if (len > 0 && line_buf[len - 1] == '\n')
     72 	line_buf[--len] = '\0';
     73       while (len > 0
     74 	     && (line_buf[len - 1] == ' '
     75 		 || line_buf[len - 1] == '\t'
     76 		 || line_buf[len - 1] == '\r'))
     77 	line_buf[--len] = '\0';
     78 
     79       /* Test if we have to ignore the line.  */
     80       if (*line_buf == '\0' || *line_buf == '#')
     81 	continue;
     82 
     83       string_list_append_unique (result, line_buf);
     84     }
     85 
     86   /* Free buffer allocated through getline.  */
     87   if (line_buf != NULL)
     88     free (line_buf);
     89 
     90   /* Close input stream.  */
     91   if (fp != stdin)
     92     fclose (fp);
     93 
     94   return result;
     95 }
     96