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Diffstat (limited to 'texinfo/info/filesys.c')
| -rw-r--r-- | texinfo/info/filesys.c | 617 |
1 files changed, 617 insertions, 0 deletions
diff --git a/texinfo/info/filesys.c b/texinfo/info/filesys.c new file mode 100644 index 00000000000..e684bf81f7b --- /dev/null +++ b/texinfo/info/filesys.c @@ -0,0 +1,617 @@ +/* filesys.c -- File system specific functions for hacking this system. */ + +/* This file is part of GNU Info, a program for reading online documentation + stored in Info format. + + Copyright (C) 1993 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Written by Brian Fox (bfox@ai.mit.edu). */ + +#include <stdio.h> +#include <sys/types.h> +#include <sys/stat.h> +#if defined (HAVE_SYS_FILE_H) +#include <sys/file.h> +#endif /* HAVE_SYS_FILE_H */ +#include <sys/errno.h> +#include "general.h" +#include "tilde.h" +#include "filesys.h" + +#if !defined (O_RDONLY) +#if defined (HAVE_SYS_FCNTL_H) +#include <sys/fcntl.h> +#else /* !HAVE_SYS_FCNTL_H */ +#include <fcntl.h> +#endif /* !HAVE_SYS_FCNTL_H */ +#endif /* !O_RDONLY */ + +#if !defined (errno) +extern int errno; +#endif /* !errno */ + +/* Found in info-utils.c. */ +extern char *filename_non_directory (); + +#if !defined (BUILDING_LIBRARY) +/* Found in session.c */ +extern int info_windows_initialized_p; + +/* Found in window.c. */ +extern void message_in_echo_area (), unmessage_in_echo_area (); +#endif /* !BUILDING_LIBRARY */ + +/* Local to this file. */ +static char *info_file_in_path (), *lookup_info_filename (); +static void remember_info_filename (), maybe_initialize_infopath (); + +#if !defined (NULL) +# define NULL 0x0 +#endif /* !NULL */ + +typedef struct { + char *suffix; + char *decompressor; +} COMPRESSION_ALIST; + +static char *info_suffixes[] = { + "", + ".info", + "-info", + (char *)NULL +}; + +static COMPRESSION_ALIST compress_suffixes[] = { + { ".Z", "uncompress" }, + { ".Y", "unyabba" }, + { ".z", "gunzip" }, + { ".gz", "gunzip" }, + { (char *)NULL, (char *)NULL } +}; + +/* The path on which we look for info files. You can initialize this + from the environment variable INFOPATH if there is one, or you can + call info_add_path () to add paths to the beginning or end of it. + You can call zap_infopath () to make the path go away. */ +char *infopath = (char *)NULL; +static int infopath_size = 0; + +/* Expand the filename in PARTIAL to make a real name for this operating + system. This looks in INFO_PATHS in order to find the correct file. + If it can't find the file, it returns NULL. */ +static char *local_temp_filename = (char *)NULL; +static int local_temp_filename_size = 0; + +char * +info_find_fullpath (partial) + char *partial; +{ + int initial_character; + char *temp; + + filesys_error_number = 0; + + maybe_initialize_infopath (); + + if (partial && (initial_character = *partial)) + { + char *expansion; + + expansion = lookup_info_filename (partial); + + if (expansion) + return (expansion); + + /* If we have the full path to this file, we still may have to add + various extensions to it. I guess we have to stat this file + after all. */ + if (initial_character == '/') + temp = info_file_in_path (partial + 1, "/"); + else if (initial_character == '~') + { + expansion = tilde_expand_word (partial); + if (*expansion == '/') + { + temp = info_file_in_path (expansion + 1, "/"); + free (expansion); + } + else + temp = expansion; + } + else if (initial_character == '.' && + (partial[1] == '/' || (partial[1] == '.' && partial[2] == '/'))) + { + if (local_temp_filename_size < 1024) + local_temp_filename = (char *)xrealloc + (local_temp_filename, (local_temp_filename_size = 1024)); +#if defined (HAVE_GETCWD) + if (!getcwd (local_temp_filename, local_temp_filename_size)) +#else /* !HAVE_GETCWD */ + if (!getwd (local_temp_filename)) +#endif /* !HAVE_GETCWD */ + { + filesys_error_number = errno; + return (partial); + } + + strcat (local_temp_filename, "/"); + strcat (local_temp_filename, partial); + return (local_temp_filename); + } + else + temp = info_file_in_path (partial, infopath); + + if (temp) + { + remember_info_filename (partial, temp); + if (strlen (temp) > local_temp_filename_size) + local_temp_filename = (char *) xrealloc + (local_temp_filename, + (local_temp_filename_size = (50 + strlen (temp)))); + strcpy (local_temp_filename, temp); + free (temp); + return (local_temp_filename); + } + } + return (partial); +} + +/* Scan the list of directories in PATH looking for FILENAME. If we find + one that is a regular file, return it as a new string. Otherwise, return + a NULL pointer. */ +static char * +info_file_in_path (filename, path) + char *filename, *path; +{ + struct stat finfo; + char *temp_dirname; + int statable, dirname_index; + + dirname_index = 0; + + while (temp_dirname = extract_colon_unit (path, &dirname_index)) + { + register int i, pre_suffix_length; + char *temp; + + /* Expand a leading tilde if one is present. */ + if (*temp_dirname == '~') + { + char *expanded_dirname; + + expanded_dirname = tilde_expand_word (temp_dirname); + free (temp_dirname); + temp_dirname = expanded_dirname; + } + + temp = (char *)xmalloc (30 + strlen (temp_dirname) + strlen (filename)); + strcpy (temp, temp_dirname); + if (temp[(strlen (temp)) - 1] != '/') + strcat (temp, "/"); + strcat (temp, filename); + + pre_suffix_length = strlen (temp); + + free (temp_dirname); + + for (i = 0; info_suffixes[i]; i++) + { + strcpy (temp + pre_suffix_length, info_suffixes[i]); + + statable = (stat (temp, &finfo) == 0); + + /* If we have found a regular file, then use that. Else, if we + have found a directory, look in that directory for this file. */ + if (statable) + { + if (S_ISREG (finfo.st_mode)) + { + return (temp); + } + else if (S_ISDIR (finfo.st_mode)) + { + char *newpath, *filename_only, *newtemp; + + newpath = strdup (temp); + filename_only = filename_non_directory (filename); + newtemp = info_file_in_path (filename_only, newpath); + + free (newpath); + if (newtemp) + { + free (temp); + return (newtemp); + } + } + } + else + { + /* Add various compression suffixes to the name to see if + the file is present in compressed format. */ + register int j, pre_compress_suffix_length; + + pre_compress_suffix_length = strlen (temp); + + for (j = 0; compress_suffixes[j].suffix; j++) + { + strcpy (temp + pre_compress_suffix_length, + compress_suffixes[j].suffix); + + statable = (stat (temp, &finfo) == 0); + if (statable && (S_ISREG (finfo.st_mode))) + return (temp); + } + } + } + free (temp); + } + return ((char *)NULL); +} + +/* Given a string containing units of information separated by colons, + return the next one pointed to by IDX, or NULL if there are no more. + Advance IDX to the character after the colon. */ +char * +extract_colon_unit (string, idx) + char *string; + int *idx; +{ + register int i, start; + + i = start = *idx; + if ((i >= strlen (string)) || !string) + return ((char *) NULL); + + while (string[i] && string[i] != ':') + i++; + if (i == start) + { + return ((char *) NULL); + } + else + { + char *value; + + value = (char *) xmalloc (1 + (i - start)); + strncpy (value, &string[start], (i - start)); + value[i - start] = '\0'; + if (string[i]) + ++i; + *idx = i; + return (value); + } +} + +/* A structure which associates a filename with its expansion. */ +typedef struct { + char *filename; + char *expansion; +} FILENAME_LIST; + +/* An array of remembered arguments and results. */ +static FILENAME_LIST **names_and_files = (FILENAME_LIST **)NULL; +static int names_and_files_index = 0; +static int names_and_files_slots = 0; + +/* Find the result for having already called info_find_fullpath () with + FILENAME. */ +static char * +lookup_info_filename (filename) + char *filename; +{ + if (filename && names_and_files) + { + register int i; + for (i = 0; names_and_files[i]; i++) + { + if (strcmp (names_and_files[i]->filename, filename) == 0) + return (names_and_files[i]->expansion); + } + } + return (char *)NULL;; +} + +/* Add a filename and its expansion to our list. */ +static void +remember_info_filename (filename, expansion) + char *filename, *expansion; +{ + FILENAME_LIST *new; + + if (names_and_files_index + 2 > names_and_files_slots) + { + int alloc_size; + names_and_files_slots += 10; + + alloc_size = names_and_files_slots * sizeof (FILENAME_LIST *); + + names_and_files = + (FILENAME_LIST **) xrealloc (names_and_files, alloc_size); + } + + new = (FILENAME_LIST *)xmalloc (sizeof (FILENAME_LIST)); + new->filename = strdup (filename); + new->expansion = expansion ? strdup (expansion) : (char *)NULL; + + names_and_files[names_and_files_index++] = new; + names_and_files[names_and_files_index] = (FILENAME_LIST *)NULL; +} + +static void +maybe_initialize_infopath () +{ + if (!infopath_size) + { + infopath = (char *) + xmalloc (infopath_size = (1 + strlen (DEFAULT_INFOPATH))); + + strcpy (infopath, DEFAULT_INFOPATH); + } +} + +/* Add PATH to the list of paths found in INFOPATH. 2nd argument says + whether to put PATH at the front or end of INFOPATH. */ +void +info_add_path (path, where) + char *path; + int where; +{ + int len; + + if (!infopath) + { + infopath = (char *)xmalloc (infopath_size = 200 + strlen (path)); + infopath[0] = '\0'; + } + + len = strlen (path) + strlen (infopath); + + if (len + 2 >= infopath_size) + infopath = (char *)xrealloc (infopath, (infopath_size += (2 * len) + 2)); + + if (!*infopath) + strcpy (infopath, path); + else if (where == INFOPATH_APPEND) + { + strcat (infopath, ":"); + strcat (infopath, path); + } + else if (where == INFOPATH_PREPEND) + { + char *temp = strdup (infopath); + strcpy (infopath, path); + strcat (infopath, ":"); + strcat (infopath, temp); + free (temp); + } +} + +/* Make INFOPATH have absolutely nothing in it. */ +void +zap_infopath () +{ + if (infopath) + free (infopath); + + infopath = (char *)NULL; + infopath_size = 0; +} + +/* Read the contents of PATHNAME, returning a buffer with the contents of + that file in it, and returning the size of that buffer in FILESIZE. + FINFO is a stat struct which has already been filled in by the caller. + If the file cannot be read, return a NULL pointer. */ +char * +filesys_read_info_file (pathname, filesize, finfo) + char *pathname; + long *filesize; + struct stat *finfo; +{ + long st_size; + + *filesize = filesys_error_number = 0; + + if (compressed_filename_p (pathname)) + return (filesys_read_compressed (pathname, filesize, finfo)); + else + { + int descriptor; + char *contents; + + descriptor = open (pathname, O_RDONLY, 0666); + + /* If the file couldn't be opened, give up. */ + if (descriptor < 0) + { + filesys_error_number = errno; + return ((char *)NULL); + } + + /* Try to read the contents of this file. */ + st_size = (long) finfo->st_size; + contents = (char *)xmalloc (1 + st_size); + if ((read (descriptor, contents, st_size)) != st_size) + { + filesys_error_number = errno; + close (descriptor); + free (contents); + return ((char *)NULL); + } + + close (descriptor); + + *filesize = st_size; + return (contents); + } +} + +/* Typically, pipe buffers are 4k. */ +#define BASIC_PIPE_BUFFER (4 * 1024) + +/* We use some large multiple of that. */ +#define FILESYS_PIPE_BUFFER_SIZE (16 * BASIC_PIPE_BUFFER) + +char * +filesys_read_compressed (pathname, filesize, finfo) + char *pathname; + long *filesize; + struct stat *finfo; +{ + FILE *stream; + char *command, *decompressor; + char *contents = (char *)NULL; + + *filesize = filesys_error_number = 0; + + decompressor = filesys_decompressor_for_file (pathname); + + if (!decompressor) + return ((char *)NULL); + + command = (char *)xmalloc (10 + strlen (pathname) + strlen (decompressor)); + sprintf (command, "%s < %s", decompressor, pathname); + +#if !defined (BUILDING_LIBRARY) + if (info_windows_initialized_p) + { + char *temp; + + temp = (char *)xmalloc (5 + strlen (command)); + sprintf (temp, "%s...", command); + message_in_echo_area ("%s", temp); + free (temp); + } +#endif /* !BUILDING_LIBRARY */ + + stream = popen (command, "r"); + free (command); + + /* Read chunks from this file until there are none left to read. */ + if (stream) + { + int offset, size; + char *chunk; + + offset = size = 0; + chunk = (char *)xmalloc (FILESYS_PIPE_BUFFER_SIZE); + + while (1) + { + int bytes_read; + + bytes_read = fread (chunk, 1, FILESYS_PIPE_BUFFER_SIZE, stream); + + if (bytes_read + offset >= size) + contents = (char *)xrealloc + (contents, size += (2 * FILESYS_PIPE_BUFFER_SIZE)); + + memcpy (contents + offset, chunk, bytes_read); + offset += bytes_read; + if (bytes_read != FILESYS_PIPE_BUFFER_SIZE) + break; + } + + free (chunk); + pclose (stream); + contents = (char *)xrealloc (contents, offset + 1); + *filesize = offset; + } + else + { + filesys_error_number = errno; + } + +#if !defined (BUILDING_LIBARARY) + if (info_windows_initialized_p) + unmessage_in_echo_area (); +#endif /* !BUILDING_LIBRARY */ + return (contents); +} + +/* Return non-zero if FILENAME belongs to a compressed file. */ +int +compressed_filename_p (filename) + char *filename; +{ + char *decompressor; + + /* Find the final extension of this filename, and see if it matches one + of our known ones. */ + decompressor = filesys_decompressor_for_file (filename); + + if (decompressor) + return (1); + else + return (0); +} + +/* Return the command string that would be used to decompress FILENAME. */ +char * +filesys_decompressor_for_file (filename) + char *filename; +{ + register int i; + char *extension = (char *)NULL; + + /* Find the final extension of FILENAME, and see if it appears in our + list of known compression extensions. */ + for (i = strlen (filename) - 1; i > 0; i--) + if (filename[i] == '.') + { + extension = filename + i; + break; + } + + if (!extension) + return ((char *)NULL); + + for (i = 0; compress_suffixes[i].suffix; i++) + if (strcmp (extension, compress_suffixes[i].suffix) == 0) + return (compress_suffixes[i].decompressor); + + return ((char *)NULL); +} + +/* The number of the most recent file system error. */ +int filesys_error_number = 0; + +/* A function which returns a pointer to a static buffer containing + an error message for FILENAME and ERROR_NUM. */ +static char *errmsg_buf = (char *)NULL; +static int errmsg_buf_size = 0; + +char * +filesys_error_string (filename, error_num) + char *filename; + int error_num; +{ + int len; + char *result; + + if (error_num == 0) + return ((char *)NULL); + + result = strerror (error_num); + + len = 4 + strlen (filename) + strlen (result); + if (len >= errmsg_buf_size) + errmsg_buf = (char *)xrealloc (errmsg_buf, (errmsg_buf_size = 2 + len)); + + sprintf (errmsg_buf, "%s: %s", filename, result); + return (errmsg_buf); +} + |