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[glibc.git] / catgets / catgets.c
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1 /* Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library 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 GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <alloca.h>
21 #include <errno.h>
22 #include <nl_types.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <unistd.h>
26 #include <sys/mman.h>
28 #include "catgetsinfo.h"
31 /* Open the catalog and return a descriptor for the catalog. */
32 nl_catd
33 catopen (const char *cat_name, int flag)
35 __nl_catd result;
36 const char *env_var;
37 const char *nlspath;
39 result = (__nl_catd) malloc (sizeof (*result));
40 if (result == NULL)
41 /* We cannot get enough memory. */
42 return (nl_catd) -1;
44 result->status = closed;
46 result->cat_name = __strdup (cat_name);
47 if (result->cat_name == NULL)
49 free (result);
50 __set_errno (ENOMEM);
51 return (nl_catd) -1;
54 if (strchr (cat_name, '/') == NULL)
56 if (flag == NL_CAT_LOCALE)
58 env_var = getenv ("LC_ALL");
59 if (env_var == NULL)
61 env_var = getenv ("LC_MESSAGES");
62 if (env_var == NULL)
64 env_var = getenv ("LANG");
65 if (env_var == NULL)
66 env_var = "C";
70 else
72 env_var = getenv ("LANG");
73 if (env_var == NULL)
74 env_var = "C";
77 result->env_var = __strdup (env_var);
78 if (result->env_var == NULL)
80 free ((void *) result->cat_name);
81 free ((void *) result);
82 __set_errno (ENOMEM);
83 return (nl_catd) -1;
86 nlspath = __secure_getenv ("NLSPATH");
87 if (nlspath != NULL && *nlspath != '\0')
89 /* Append the system dependent directory. */
90 size_t len = strlen (nlspath) + 1 + sizeof NLSPATH;
91 char *tmp = alloca (len);
93 __stpcpy (__stpcpy (__stpcpy (tmp, nlspath), ":"), NLSPATH);
94 nlspath = tmp;
96 else
97 nlspath = NLSPATH;
99 result->nlspath = __strdup (NLSPATH);
100 if (result->nlspath == NULL)
102 free ((void *) result->cat_name);
103 free ((void *) result->env_var);
104 free ((void *) result);
105 __set_errno (ENOMEM);
106 return (nl_catd) -1;
109 else
111 result->env_var = NULL;
112 result->nlspath = NULL;
115 __libc_lock_init (result->lock);
117 return (nl_catd) result;
121 /* Return message from message catalog. */
122 char *
123 catgets (nl_catd catalog_desc, int set, int message, const char *string)
125 __nl_catd catalog;
126 size_t idx;
127 size_t cnt;
129 /* Be generous if catalog which failed to be open is used. */
130 if (catalog_desc == (nl_catd) -1 || ++set <= 0 || message < 0)
131 return (char *) string;
133 catalog = (__nl_catd) catalog_desc;
135 if (catalog->status == closed)
136 __open_catalog (catalog);
138 if (catalog->status == nonexisting)
140 __set_errno (EBADF);
141 return (char *) string;
144 idx = ((set * message) % catalog->plane_size) * 3;
145 cnt = 0;
148 if (catalog->name_ptr[idx + 0] == (u_int32_t) set
149 && catalog->name_ptr[idx + 1] == (u_int32_t) message)
150 return (char *) &catalog->strings[catalog->name_ptr[idx + 2]];
152 idx += catalog->plane_size * 3;
154 while (++cnt < catalog->plane_depth);
156 __set_errno (ENOMSG);
157 return (char *) string;
161 /* Return resources used for loaded message catalog. */
163 catclose (nl_catd catalog_desc)
165 __nl_catd catalog;
167 catalog = (__nl_catd) catalog_desc;
169 #ifdef _POSIX_MAPPED_FILES
170 if (catalog->status == mmapped)
171 __munmap ((void *) catalog->file_ptr, catalog->file_size);
172 else
173 #endif /* _POSIX_MAPPED_FILES */
174 if (catalog->status == malloced)
175 free ((void *) catalog->file_ptr);
176 else if (catalog->status != closed && catalog->status != nonexisting)
178 __set_errno (EBADF);
179 return -1;
182 if (catalog->nlspath)
183 free ((void *) catalog->nlspath);
184 if (catalog->env_var)
185 free ((void *) catalog->env_var);
186 free ((void *) catalog);
188 return 0;