gnu/dist/gettext/gettext-tools/src/file-list.c

   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 }