catgets/open_catalog.c - nest-cam/v350/glibc - Git at Google

 /* Copyright (C) 1996-2000, 2001, 2002, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper, <drepper@gnu.org>.

    The GNU C Library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with the GNU C Library; if not, write to the Free
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */

 #include <byteswap.h>
 #include <endian.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
 #ifdef _POSIX_MAPPED_FILES
 # include <sys/mman.h>
 #endif
 #include <sys/stat.h>

 #include "catgetsinfo.h"
 #include <not-cancel.h>


 #define SWAPU32(w) bswap_32 (w)


 int
 __open_catalog (const char *cat_name, const char *nlspath, const char *env_var,
 		__nl_catd catalog)
 {
   int fd = -1;
   struct stat64 st;
   int swapping;
   size_t cnt;
   size_t max_offset;
   size_t tab_size;
   const char *lastp;
   int result = -1;

   if (strchr (cat_name, '/') != NULL || nlspath == NULL)
     fd = open_not_cancel_2 (cat_name, O_RDONLY);
   else
     {
       const char *run_nlspath = nlspath;
 #define ENOUGH(n)							      \
   if (__builtin_expect (bufact + (n) >= bufmax, 0))			      \
     {									      \
       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;
       size_t len;

       buf = NULL;
       bufmax = 0;

       fd = -1;
       while (*run_nlspath != '\0')
 	{
 	  bufact = 0;

 	  if (*run_nlspath == ':')
 	    {
 	      /* Leading colon or adjacent colons - treat same as %N.  */
 	      len = strlen (cat_name);
 	      ENOUGH (len);
 	      memcpy (&buf[bufact], cat_name, len);
 	      bufact += len;
 	    }
 	  else
 	    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.  */
 		      len = strlen (cat_name);
 		      ENOUGH (len);
 		      memcpy (&buf[bufact], cat_name, len);
 		      bufact += len;
 		      break;
 		    case 'L':
 		      /* Use the current locale category value.  */
 		      len = strlen (env_var);
 		      ENOUGH (len);
 		      memcpy (&buf[bufact], env_var, len);
 		      bufact += len;
 		      break;
 		    case 'l':
 		      /* Use language element of locale category value.  */
 		      tmp = env_var;
 		      do
 			{
 			  ENOUGH (1);
 			  buf[bufact++] = *tmp++;
 			}
 		      while (*tmp != '\0' && *tmp != '_' && *tmp != '.');
 		      break;
 		    case 't':
 		      /* Use territory element of locale category value.  */
 		      tmp = 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 = 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_not_cancel_2 (buf, O_RDONLY);
 	      if (fd >= 0)
 		break;
 	    }

 	  ++run_nlspath;
 	}
     }

   /* Avoid dealing with directories and block devices */
   if (__builtin_expect (fd, 0) < 0)
     return -1;

   if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
     goto close_unlock_return;

   if (__builtin_expect (!S_ISREG (st.st_mode), 0)
       || (size_t) st.st_size < sizeof (struct catalog_obj))
     {
       /* `errno' is not set correctly but the file is not usable.
 	 Use an reasonable error value.  */
       __set_errno (EINVAL);
       goto close_unlock_return;
     }

   catalog->file_size = st.st_size;
 #ifdef _POSIX_MAPPED_FILES
 # 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
   catalog->file_ptr =
     (struct catalog_obj *) __mmap (NULL, st.st_size, PROT_READ,
 				   MAP_FILE|MAP_COPY, fd, 0);
   if (__builtin_expect (catalog->file_ptr != (struct catalog_obj *) MAP_FAILED,
 			1))
     /* Tell the world we managed to mmap the file.  */
     catalog->status = mmapped;
   else
 #endif /* _POSIX_MAPPED_FILES */
     {
       /* 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)
 	goto close_unlock_return;

       todo = st.st_size;
       /* Save read, handle partial reads.  */
       do
 	{
 	  size_t now = read_not_cancel (fd, (((char *) catalog->file_ptr)
 					     + (st.st_size - todo)), todo);
 	  if (now == 0 || now == (size_t) -1)
 	    {
 #ifdef EINTR
 	      if (now == (size_t) -1 && errno == EINTR)
 		continue;
 #endif
 	      free ((void *) catalog->file_ptr);
 	      goto close_unlock_return;
 	    }
 	  todo -= now;
 	}
       while (todo > 0);
       catalog->status = malloced;
     }

   /* 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 (__builtin_expect (catalog->file_ptr->magic == CATGETS_MAGIC, 1))
     swapping = 0;
   else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
     swapping = 1;
   else
     {
     invalid_file:
       /* Invalid file.  Free the resources and mark catalog as not
 	 usable.  */
 #ifdef _POSIX_MAPPED_FILES
       if (catalog->status == mmapped)
 	__munmap ((void *) catalog->file_ptr, catalog->file_size);
       else
 #endif	/* _POSIX_MAPPED_FILES */
 	free (catalog->file_ptr);
       goto close_unlock_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];

   /* Determine the largest string offset mentioned in the table.  */
   max_offset = 0;
   tab_size = 3 * catalog->plane_size * catalog->plane_depth;
   for (cnt = 2; cnt < tab_size; cnt += 3)
     if (catalog->name_ptr[cnt] > max_offset)
       max_offset = catalog->name_ptr[cnt];

   /* Now we can check whether the file is large enough to contain the
      tables it says it contains.  */
   if ((size_t) st.st_size
       <= (sizeof (struct catalog_obj) + 2 * tab_size + max_offset))
     /* The last string is not contained in the file.  */
     goto invalid_file;

   lastp = catalog->strings + max_offset;
   max_offset = (st.st_size
 		- sizeof (struct catalog_obj) + 2 * tab_size + max_offset);
   while (*lastp != '\0')
     {
       if (--max_offset == 0)
 	goto invalid_file;
       ++lastp;
     }

   /* We succeeded.  */
   result = 0;

   /* Release the lock again.  */
  close_unlock_return:
   close_not_cancel_no_status (fd);

   return result;
 }
 libc_hidden_def (__open_catalog)
	/* Copyright (C) 1996-2000, 2001, 2002, 2003 Free Software Foundation, Inc.
	This file is part of the GNU C Library.
	Contributed by Ulrich Drepper, <drepper@gnu.org>.

	The GNU C Library is free software; you can redistribute it and/or
	modify it under the terms of the GNU Lesser General Public
	License as published by the Free Software Foundation; either
	version 2.1 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
	Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public
	License along with the GNU C Library; if not, write to the Free
	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	02111-1307 USA. */

	#include <byteswap.h>
	#include <endian.h>
	#include <errno.h>
	#include <fcntl.h>
	#include <string.h>
	#include <stdlib.h>
	#include <unistd.h>
	#ifdef _POSIX_MAPPED_FILES
	# include <sys/mman.h>
	#endif
	#include <sys/stat.h>

	#include "catgetsinfo.h"
	#include <not-cancel.h>


	#define SWAPU32(w) bswap_32 (w)


	int
	__open_catalog (const char cat_name, const char nlspath, const char *env_var,
	__nl_catd catalog)
	{
	int fd = -1;
	struct stat64 st;
	int swapping;
	size_t cnt;
	size_t max_offset;
	size_t tab_size;
	const char *lastp;
	int result = -1;

	if (strchr (cat_name, '/') != NULL \|\| nlspath == NULL)
	fd = open_not_cancel_2 (cat_name, O_RDONLY);
	else
	{
	const char *run_nlspath = nlspath;
	#define ENOUGH(n) \
	if (__builtin_expect (bufact + (n) >= bufmax, 0)) \
	{ \
	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;
	size_t len;

	buf = NULL;
	bufmax = 0;

	fd = -1;
	while (*run_nlspath != '\0')
	{
	bufact = 0;

	if (*run_nlspath == ':')
	{
	/* Leading colon or adjacent colons - treat same as %N. */
	len = strlen (cat_name);
	ENOUGH (len);
	memcpy (&buf[bufact], cat_name, len);
	bufact += len;
	}
	else
	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. */
	len = strlen (cat_name);
	ENOUGH (len);
	memcpy (&buf[bufact], cat_name, len);
	bufact += len;
	break;
	case 'L':
	/* Use the current locale category value. */
	len = strlen (env_var);
	ENOUGH (len);
	memcpy (&buf[bufact], env_var, len);
	bufact += len;
	break;
	case 'l':
	/* Use language element of locale category value. */
	tmp = env_var;
	do
	{
	ENOUGH (1);
	buf[bufact++] = *tmp++;
	}
	while (tmp != '\0' && tmp != '_' && *tmp != '.');
	break;
	case 't':
	/* Use territory element of locale category value. */
	tmp = 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 = 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_not_cancel_2 (buf, O_RDONLY);
	if (fd >= 0)
	break;
	}

	++run_nlspath;
	}
	}

	/* Avoid dealing with directories and block devices */
	if (__builtin_expect (fd, 0) < 0)
	return -1;

	if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) < 0)
	goto close_unlock_return;

	if (__builtin_expect (!S_ISREG (st.st_mode), 0)
	\|\| (size_t) st.st_size < sizeof (struct catalog_obj))
	{
	/* `errno' is not set correctly but the file is not usable.
	Use an reasonable error value. */
	__set_errno (EINVAL);
	goto close_unlock_return;
	}

	catalog->file_size = st.st_size;
	#ifdef _POSIX_MAPPED_FILES
	# 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
	catalog->file_ptr =
	(struct catalog_obj *) __mmap (NULL, st.st_size, PROT_READ,
	MAP_FILE\|MAP_COPY, fd, 0);
	if (__builtin_expect (catalog->file_ptr != (struct catalog_obj *) MAP_FAILED,
	1))
	/* Tell the world we managed to mmap the file. */
	catalog->status = mmapped;
	else
	#endif /* _POSIX_MAPPED_FILES */
	{
	/* 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)
	goto close_unlock_return;

	todo = st.st_size;
	/* Save read, handle partial reads. */
	do
	{
	size_t now = read_not_cancel (fd, (((char *) catalog->file_ptr)
	+ (st.st_size - todo)), todo);
	if (now == 0 \|\| now == (size_t) -1)
	{
	#ifdef EINTR
	if (now == (size_t) -1 && errno == EINTR)
	continue;
	#endif
	free ((void *) catalog->file_ptr);
	goto close_unlock_return;
	}
	todo -= now;
	}
	while (todo > 0);
	catalog->status = malloced;
	}

	/* 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 (__builtin_expect (catalog->file_ptr->magic == CATGETS_MAGIC, 1))
	swapping = 0;
	else if (catalog->file_ptr->magic == SWAPU32 (CATGETS_MAGIC))
	swapping = 1;
	else
	{
	invalid_file:
	/* Invalid file. Free the resources and mark catalog as not
	usable. */
	#ifdef _POSIX_MAPPED_FILES
	if (catalog->status == mmapped)
	__munmap ((void *) catalog->file_ptr, catalog->file_size);
	else
	#endif /* _POSIX_MAPPED_FILES */
	free (catalog->file_ptr);
	goto close_unlock_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];

	/* Determine the largest string offset mentioned in the table. */
	max_offset = 0;
	tab_size = 3 * catalog->plane_size * catalog->plane_depth;
	for (cnt = 2; cnt < tab_size; cnt += 3)
	if (catalog->name_ptr[cnt] > max_offset)
	max_offset = catalog->name_ptr[cnt];

	/* Now we can check whether the file is large enough to contain the
	tables it says it contains. */
	if ((size_t) st.st_size
	<= (sizeof (struct catalog_obj) + 2 * tab_size + max_offset))
	/* The last string is not contained in the file. */
	goto invalid_file;

	lastp = catalog->strings + max_offset;
	max_offset = (st.st_size
	- sizeof (struct catalog_obj) + 2 * tab_size + max_offset);
	while (*lastp != '\0')
	{
	if (--max_offset == 0)
	goto invalid_file;
	++lastp;
	}

	/* We succeeded. */
	result = 0;

	/* Release the lock again. */
	close_unlock_return:
	close_not_cancel_no_status (fd);

	return result;
	}
	libc_hidden_def (__open_catalog)