1/* open-po - search for .po file along search path list and open for reading
2   Copyright (C) 1995-1996, 2000-2003, 2005-2007 Free Software Foundation, Inc.
3   Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, April 1995.
4
5   This program is free software: you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#ifdef HAVE_CONFIG_H
19# include <config.h>
20#endif
21
22/* Specification.  */
23#include "open-catalog.h"
24
25#include <errno.h>
26#include <stdbool.h>
27#include <stdio.h>
28#include <stdlib.h>
29#include <string.h>
30
31#include "dir-list.h"
32#include "filename.h"
33#include "xalloc.h"
34#include "xvasprintf.h"
35#include "po-xerror.h"
36#include "gettext.h"
37
38#define _(str) gettext (str)
39
40/* This macro is used to determine the number of elements in an erray.  */
41#define SIZEOF(a) (sizeof(a)/sizeof(a[0]))
42
43static FILE *
44try_open_catalog_file (const char *input_name, char **real_file_name_p)
45{
46  static const char *extension[] = { "", ".po", ".pot", };
47  char *file_name;
48  FILE *ret_val;
49  int j;
50  size_t k;
51  const char *dir;
52
53  if (strcmp (input_name, "-") == 0 || strcmp (input_name, "/dev/stdin") == 0)
54    {
55      *real_file_name_p = xstrdup (_("<stdin>"));
56      return stdin;
57    }
58
59  /* We have a real name for the input file.  If the name is absolute,
60     try the various extensions, but ignore the directory search list.  */
61  if (IS_ABSOLUTE_PATH (input_name))
62    {
63      for (k = 0; k < SIZEOF (extension); ++k)
64	{
65	  file_name = concatenated_filename ("", input_name, extension[k]);
66
67	  ret_val = fopen (file_name, "r");
68	  if (ret_val != NULL || errno != ENOENT)
69	    {
70	      /* We found the file.  */
71	      *real_file_name_p = file_name;
72	      return ret_val;
73	    }
74
75	  free (file_name);
76	}
77    }
78  else
79    {
80      /* For relative file names, look through the directory search list,
81	 trying the various extensions.  If no directory search list is
82	 specified, the current directory is used.  */
83      for (j = 0; (dir = dir_list_nth (j)) != NULL; ++j)
84	for (k = 0; k < SIZEOF (extension); ++k)
85	  {
86	    file_name = concatenated_filename (dir, input_name, extension[k]);
87
88	    ret_val = fopen (file_name, "r");
89	    if (ret_val != NULL || errno != ENOENT)
90	      {
91		*real_file_name_p = file_name;
92		return ret_val;
93	      }
94
95	    free (file_name);
96	  }
97    }
98
99  /* File does not exist.  */
100  *real_file_name_p = xstrdup (input_name);
101  errno = ENOENT;
102  return NULL;
103}
104
105/* Open the input file with the name INPUT_NAME.  The ending .po is added
106   if necessary.  If INPUT_NAME is not an absolute file name and the file is
107   not found, the list of directories in "dir-list.h" is searched.  The
108   file's pathname is returned in *REAL_FILE_NAME_P, for error message
109   purposes.  */
110FILE *
111open_catalog_file (const char *input_name, char **real_file_name_p,
112		   bool exit_on_error)
113{
114  FILE *fp = try_open_catalog_file (input_name, real_file_name_p);
115
116  if (fp == NULL && exit_on_error)
117    {
118      const char *errno_description = strerror (errno);
119      po_xerror (PO_SEVERITY_FATAL_ERROR, NULL, NULL, 0, 0, false,
120		 xasprintf ("%s: %s",
121			    xasprintf (_("error while opening \"%s\" for reading"),
122				       *real_file_name_p),
123			    errno_description));
124    }
125
126  return fp;
127}
128