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-rw-r--r--catgets/open_catalog.c263
1 files changed, 263 insertions, 0 deletions
diff --git a/catgets/open_catalog.c b/catgets/open_catalog.c
new file mode 100644
index 0000000000..9a8c7e643e
--- /dev/null
+++ b/catgets/open_catalog.c
@@ -0,0 +1,263 @@
+/* Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+Contributed by Ulrich Drepper, <drepper@gnu.ai.mit.edu>.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+#include <endian.h>
+#include <fcntl.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+
+#include "catgetsinfo.h"
+
+
+#define SWAPU32(w) \
+ (((w) << 24) | (((w) & 0xff00) << 8) | (((w) >> 8) & 0xff00) | ((w) >> 24))
+
+
+void
+__open_catalog (__nl_catd catalog, int with_path)
+{
+ int fd;
+ struct stat st;
+ int swapping;
+
+ if (strchr (catalog->cat_name, '/') != NULL || !with_path)
+ fd = open (catalog->cat_name, O_RDONLY);
+ else
+ {
+ const char *run_nlspath = catalog->nlspath;
+#define ENOUGH(n) \
+ if (bufact + (n) >=bufmax) \
+ { \
+ char *old_buf = buf; \
+ bufmax += 256 + (n); \
+ buf = (char *) alloca (bufmax); \
+ memcpy (buf, old_buf, bufact); \
+ }
+
+ /* The RUN_NLSPATH variable contains a colon separated list of
+ descriptions where we expect to find catalogs. We have to
+ recognize certain % substitutions and stop when we found the
+ first existing file. */
+ char *buf;
+ size_t bufact;
+ size_t bufmax;
+
+ buf = NULL;
+ bufmax = 0;
+
+ fd = -1;
+ while (*run_nlspath != '\0')
+ {
+ bufact = 0;
+ while (*run_nlspath != ':' && *run_nlspath != '\0')
+ if (*run_nlspath == '%')
+ {
+ const char *tmp;
+
+ ++run_nlspath; /* We have seen the `%'. */
+ switch (*run_nlspath++)
+ {
+ case 'N':
+ /* Use the catalog name. */
+ ENOUGH (strlen (catalog->cat_name));
+ bufact = stpcpy (&buf[bufact], catalog->cat_name) - buf;
+ break;
+ case 'L':
+ /* Use the current locale category value. */
+ ENOUGH (strlen (catalog->env_var));
+ bufact = stpcpy (&buf[bufact], catalog->env_var) - buf;
+ break;
+ case 'l':
+ /* Use language element of locale category value. */
+ tmp = catalog->env_var;
+ do
+ {
+ ENOUGH (1);
+ buf[bufact++] = *tmp++;
+ }
+ while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
+ break;
+ case 't':
+ /* Use territory element of locale category value. */
+ tmp = catalog->env_var;
+ do
+ ++tmp;
+ while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
+ if (*tmp == '_')
+ {
+ ++tmp;
+ do
+ {
+ ENOUGH (1);
+ buf[bufact++] = *tmp;
+ }
+ while (*tmp != '\0' && *tmp != '.');
+ }
+ break;
+ case 'c':
+ /* Use code set element of locale category value. */
+ tmp = catalog->env_var;
+ do
+ ++tmp;
+ while (*tmp != '\0' && *tmp != '.');
+ if (*tmp == '.')
+ {
+ ++tmp;
+ do
+ {
+ ENOUGH (1);
+ buf[bufact++] = *tmp;
+ }
+ while (*tmp != '\0');
+ }
+ break;
+ case '%':
+ ENOUGH (1);
+ buf[bufact++] = '%';
+ break;
+ default:
+ /* Unknown variable: ignore this path element. */
+ bufact = 0;
+ while (*run_nlspath != '\0' && *run_nlspath != ':')
+ ++run_nlspath;
+ break;
+ }
+ }
+ else
+ {
+ ENOUGH (1);
+ buf[bufact++] = *run_nlspath++;
+ }
+ ENOUGH (1);
+ buf[bufact] = '\0';
+
+ if (bufact != 0)
+ {
+ fd = open (buf, O_RDONLY);
+ if (fd >= 0)
+ break;
+ }
+
+ ++run_nlspath;
+ }
+ }
+
+ if (fd < 0 || fstat (fd, &st) < 0)
+ {
+ catalog->status = nonexisting;
+ return;
+ }
+
+#ifndef MAP_COPY
+ /* Linux seems to lack read-only copy-on-write. */
+#define MAP_COPY MAP_PRIVATE
+#endif
+#ifndef MAP_FILE
+ /* Some systems do not have this flag; it is superfluous. */
+#define MAP_FILE 0
+#endif
+#ifndef MAP_INHERIT
+ /* Some systems might lack this; they lose. */
+#define MAP_INHERIT 0
+#endif
+ catalog->file_size = st.st_size;
+ catalog->file_ptr =
+ (struct catalog_obj *) mmap (NULL, st.st_size, PROT_READ,
+ MAP_FILE|MAP_COPY|MAP_INHERIT, fd, 0);
+ if (catalog->file_ptr != (struct catalog_obj *) -1)
+ /* Tell the world we managed to mmap the file. */
+ catalog->status = mmaped;
+ else
+ {
+ /* mmap failed perhaps because the system call is not
+ implemented. Try to load the file. */
+ size_t todo;
+ catalog->file_ptr = malloc (st.st_size);
+ if (catalog->file_ptr == NULL)
+ {
+ catalog->status = nonexisting;
+ return;
+ }
+ todo = st.st_size;
+ /* Save read, handle partial reads. */
+ do
+ {
+ size_t now = read (fd, (((char *) &catalog->file_ptr)
+ + (st.st_size - todo)), todo);
+ if (now == 0)
+ {
+ free ((void *) catalog->file_ptr);
+ catalog->status = nonexisting;
+ return;
+ }
+ todo -= now;
+ }
+ while (todo > 0);
+ catalog->status = malloced;
+ }
+
+ /* We don't need the file anymore. */
+ close (fd);
+
+ /* Determine whether the file is a catalog file and if yes whether
+ it is written using the correct byte order. Else we have to swap
+ the values. */
+ if (catalog->file_ptr->magic == CATGETS_MAGIC)
+ swapping = 0;
+ else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
+ swapping = 1;
+ else
+ {
+ /* Illegal file. Free he resources and mark catalog as not
+ usable. */
+ if (catalog->status == mmaped)
+ munmap ((void *) catalog->file_ptr, catalog->file_size);
+ else
+ free (catalog->file_ptr);
+ catalog->status = nonexisting;
+ return;
+ }
+
+#define SWAP(x) (swapping ? SWAPU32 (x) : (x))
+
+ /* Get dimensions of the used hashing table. */
+ catalog->plane_size = SWAP (catalog->file_ptr->plane_size);
+ catalog->plane_depth = SWAP (catalog->file_ptr->plane_depth);
+
+ /* The file contains two versions of the pointer tables. Pick the
+ right one for the local byte order. */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ catalog->name_ptr = &catalog->file_ptr->name_ptr[0];
+#elif __BYTE_ORDER == __BIG_ENDIAN
+ catalog->name_ptr = &catalog->file_ptr->name_ptr[catalog->plane_size
+ * catalog->plane_depth
+ * 3];
+#else
+# error Cannot handle __BYTE_ORDER byte order
+#endif
+
+ /* The rest of the file contains all the strings. They are
+ addressed relative to the position of the first string. */
+ catalog->strings =
+ (const char *) &catalog->file_ptr->name_ptr[catalog->plane_size
+ * catalog->plane_depth * 3 * 2];
+}
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