diff options
Diffstat (limited to 'lib/enca/src/convert_extern.c')
| -rw-r--r-- | lib/enca/src/convert_extern.c | 283 |
1 files changed, 0 insertions, 283 deletions
diff --git a/lib/enca/src/convert_extern.c b/lib/enca/src/convert_extern.c deleted file mode 100644 index 40bb1936ff..0000000000 --- a/lib/enca/src/convert_extern.c +++ /dev/null @@ -1,283 +0,0 @@ -/* - @(#) $Id: convert_extern.c,v 1.9 2003/12/23 23:08:10 yeti Exp $ - interface to external converter programs - - Copyright (C) 2000-2003 David Necas (Yeti) <yeti@physics.muni.cz> - - This program is free software; you can redistribute it and/or modify it - under the terms of version 2 of the GNU General Public License as published - by the Free Software Foundation. - - 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. -*/ -#include "common.h" -#ifdef ENABLE_EXTERNAL - -#ifdef HAVE_SYS_WAIT_H -# include <sys/wait.h> -#else -pid_t waitpid(pid_t pid, int *status, int options); -#endif - -/* We can't go on w/o this, defining struct stat manually is braindamaged. */ -#include <sys/types.h> -#include <sys/stat.h> - -#ifdef HAVE_LIMITS_H -# include <limits.h> -#endif /* HAVE_LIMITS_H */ - -/* Resolve all the forking mess. */ -#ifdef HAVE_WORKING_VFORK -# ifdef HAVE_VFORK_H -# include <vfork.h> -# endif /* HAVE_VFORK_H */ -#else /* HAVE_WORKING_VFORK */ -# define vfork fork -#endif /* HAVE_WORKING_VFORK */ - -#ifndef HAVE_CANONICALIZE_FILE_NAME -# ifdef HAVE_REALPATH -static char* canonicalize_file_name(const char *fname); -# else /* HAVE_REALPATH */ -# define canonicalize_file_name enca_strdup -# endif /* HAVE_REALPATH */ -#endif /* HAVE_CANONICALIZE_FILE_NAME */ - -/* external converter command */ -static char *extern_converter = NULL; - -/* Local prototypes. */ -static int check_executability_one(const char *progpath); - -/* fork and the child executes Settings.Converter on fname - create temporary file containing stdin when fname == NULL and convert it - passing special option STDOUT to converter (that is assumed to delete - the temporary file itself) - from_enc, to_enc are encoding names as should be passed to converter - returns 0 on success, nonzero on failure; - on critical failure (like we cannot fork()) it simply aborts */ -int -convert_external(File *file, - const EncaEncoding from_enc) -{ - /* special fourth parameter passed to external converter to instruct it to - send result to stdout */ - static const char *STDOUT_CONV = "-"; - - pid_t pid; - int status; - File *tempfile = NULL; - char *from_name, *target_name; - - if (*extern_converter == '\0') { - fprintf(stderr, "%s: No external converter defined!\n", program_name); - return ERR_CANNOT; - } - - if (options.verbosity_level > 2) - fprintf(stderr, " launching `%s' to convert `%s'\n", - extern_converter, ffname_r(file->name)); - - /* Is conversion of stdin requested? */ - if (file->name == NULL) { - /* Then we have to copy it to a temporary file. */ - tempfile = file_temporary(file->buffer, 0); - if (tempfile == NULL) - return ERR_IOFAIL; - - if (copy_and_convert(file, tempfile, NULL) != 0) { - file_unlink(tempfile->name); - file_free(tempfile); - return ERR_IOFAIL; - } - } - - /* Construct the charset names before fork() */ - from_name = enca_strconcat(enca_charset_name(from_enc.charset, - ENCA_NAME_STYLE_ENCA), - enca_get_surface_name(from_enc.surface, - ENCA_NAME_STYLE_ENCA), - NULL); - if (enca_charset_is_known(options.target_enc.charset) - && (options.target_enc.surface & ENCA_SURFACE_UNKNOWN) == 0) { - target_name - = enca_strconcat(enca_charset_name(options.target_enc.charset, - ENCA_NAME_STYLE_ENCA), - enca_get_surface_name(options.target_enc.surface, - ENCA_NAME_STYLE_ENCA), - NULL); - } - else - target_name = enca_strdup(options.target_enc_str); - - /* Fork. */ - pid = vfork(); - if (pid == 0) { - /* Child. */ - if (tempfile) - execlp(extern_converter, extern_converter, - from_name, target_name, tempfile->name, - STDOUT_CONV, NULL); - else - execlp(extern_converter, extern_converter, - from_name, target_name, file->name, NULL); - - exit(ERR_EXEC); - } - - /* Parent. */ - if (pid == -1) { - fprintf(stderr, "%s: Cannot fork() to execute converter: %s\n", - program_name, - strerror(errno)); - exit(EXIT_TROUBLE); - } - /* Wait until the child returns. */ - if (waitpid(pid, &status, 0) == -1) { - /* Error. */ - fprintf(stderr, "%s: wait_pid() error while waiting for converter: %s\n", - program_name, - strerror(errno)); - exit(EXIT_TROUBLE); - } - if (!WIFEXITED(status)) { - /* Child exited abnormally. */ - fprintf(stderr, "%s: Child converter process has been murdered.\n", - program_name); - exit(EXIT_TROUBLE); - } - - enca_free(from_name); - enca_free(target_name); - - if (tempfile) { - unlink(tempfile->name); - file_free(tempfile); - } - - /* Child exited normally, test exit status. */ - if (WEXITSTATUS(status) != EXIT_SUCCESS) { - /* This means child was unable to execute converter or converter failed. */ - fprintf(stderr, "%s: External converter failed (error code %d)\n", - program_name, - WEXITSTATUS(status)); - if (WEXITSTATUS(status) == ERR_EXEC) - return ERR_EXEC; - else - return ERR_CANNOT; - } - /* Success! Wow! */ - return ERR_OK; -} - -/* set external converter to extc */ -void -set_external_converter(const char *extc) -{ - enca_free(extern_converter); - if (strchr(extc, '/') == NULL) { - if (extc[0] == 'b' && extc[1] == '-') { - extc += 2; - fprintf(stderr, "%s: The `b-' prefix for standard external converters " - "is deprecated.\n" - "I'll pretend you said `%s'.\n", - program_name, - extc); - } - extern_converter = enca_strconcat(EXTCONV_DIR, "/", extc, NULL); - } - else - extern_converter = enca_strdup(extc); -} - -/* return nonzero if external converter seems ok */ -int -check_external_converter(void) -{ - /* FIXME: This creates a race condition. However we don't want to do all - * the checking before every execlp() when conveting 500 files in a row, - * and even if doing that, something can still sneak between stat() and - * execlp(), so what. This is just a simple sanity check, nothing strict. - */ - if (*extern_converter == '\0' - || !check_executability_one(extern_converter)) { - fprintf(stderr, "%s: Converter `%s' doesn't seem to be executable.\n" - "Note as of enca-1.3 external converters must be\n" - "(a) one of the standard ones residing in %s\n" - "(b) specified with full path\n", - program_name, - extern_converter, - EXTCONV_DIR); - return 0; - } - - return 1; -} - -/** - * Checks whether @progpath is and executable we can execute it. - * Tries to resolve relative paths and symlinks. - **/ -static int -check_executability_one(const char *progpath) -{ - static uid_t uid; - static gid_t gid; - static int check_executability_one_initialized = 0; - - struct stat st; - char *fname = canonicalize_file_name(progpath); - - /* Is it a regular file at all? */ - if (stat(fname, &st) != 0 - || (st.st_mode & S_IFREG) == 0) { - enca_free(fname); - return 0; - } - - /* Check executability by anyone, user, group. */ - enca_free(fname); - if (st.st_mode & S_IXOTH) - return 1; - - if (!check_executability_one_initialized) { - uid = getuid(); - gid = getgid(); - check_executability_one_initialized = 1; - } - - if ((st.st_mode & S_IXUSR) && st.st_uid == gid) - return 1; - - if ((st.st_mode & S_IXGRP) && st.st_uid == uid) - return 1; - - return 0; -} - -#ifndef HAVE_CANONICALIZE_FILE_NAME -# ifdef HAVE_REALPATH -# ifndef FILENAME_MAX -# define FILENAME_MAX 4096 -# endif /* FILENAME_MAX */ -static char* -canonicalize_file_name(const char *fname) -{ - char *resolved = enca_malloc(FILENAME_MAX + 1); - - return realpath(fname, resolved); -} -# endif /* HAVE_REALPATH */ -#endif /* not HAVE_CANONICALIZE_FILE_NAME */ - -#endif /* ENABLE_EXTERNAL */ -/* vim: ts=2 - */ |