undbx-0.20/0000755000175000017500000000000011373236004007553 500000000000000undbx-0.20/dist-win32.sh0000755000175000017500000000473111370547055011752 00000000000000#! /bin/bash # UnDBX - Tool to extract e-mail messages from Outlook Express DBX files. # Copyright (C) 2008-2010 Avi Rozen # # DBX file format parsing code is based on DbxConv - a DBX to MBOX # Converter. Copyright (C) 2008, 2009 Ulrich Krebs # # # RFC-2822 and RFC-2047 parsing code is adapted from GNU Mailutils - # a suite of utilities for electronic mail, Copyright (C) 2002, # 2003, 2004, 2005, 2006, 2009, 2010 Free Software Foundation, Inc. # # This file is part of UnDBX. # # UnDBX 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 3 of the License, 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, see . # # This is a convenience script that I use to package UnDBX for MS-Windows # # Usage: dist-win32.sh [host] # # The default host is i586-mingw32msvc which is the # MinGW win32 cross-compiler on Debian/testing (my dev box) # win32_host=${1:-i586-mingw32msvc} basedir=${0/%dist-win32.sh} cd "$basedir" autoreconf -vfi && find -maxdepth 1 -size 0 -exec rm -v {} \; cd - make distclean configure="$basedir""configure" distdir=$(eval "$configure --version" | head -1 | sed s/\ configure\ /-/) rm -rf ${distdir} ${distdir}.zip* ${distdir}.tar.gz* [ -f "$basedir"README.rst ] \ && rst2html "$basedir"README.rst > "$basedir"README.html \ && wikir "$basedir"README.rst > README.wiki mkdir ${distdir} win32_install_base=`cd ${distdir} && pwd | sed -e 's,^[^:\\/]:[\\/],/,'` \ && ${configure} --host=$win32_host --prefix="$win32_install_base" LDFLAGS=-s CFLAGS=-O3 \ && make dist-gzip \ && sha1sum ${distdir}.tar.gz > ${distdir}.tar.gz.sha1sum \ && make \ && make install \ && find ${distdir} -type f -exec mv -f {} ${distdir} \; \ && find ${distdir} -depth -type d -empty -exec rmdir -v {} \; \ && cp "$basedir"{README.html,COPYING} ${distdir} \ && zip -rq ${distdir}.zip ${distdir} \ && sha1sum ${distdir}.zip > ${distdir}.zip.sha1sum \ && rm -rf ${distdir} \ && make distclean undbx-0.20/dbxsys.c0000644000175000017500000001553511371342465011173 00000000000000/* UnDBX - Tool to extract e-mail messages from Outlook Express DBX files. Copyright (C) 2008-2010 Avi Rozen DBX file format parsing code is based on DbxConv - a DBX to MBOX Converter. Copyright (C) 2008, 2009 Ulrich Krebs RFC-2822 and RFC-2047 parsing code is adapted from GNU Mailutils - a suite of utilities for electronic mail, Copyright (C) 2002, 2003, 2004, 2005, 2006, 2009, 2010 Free Software Foundation, Inc. This file is part of UnDBX. UnDBX 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 3 of the License, 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, see . */ #ifdef HAVE_CONFIG_H # include #else # define WORDS_BIGENDIAN 1 /* safe default here (see sys_fread_* funcs) */ #endif #include #include #include #include #include #include #include "dbxsys.h" #define JAN1ST1970 0x19DB1DED53E8000ULL #define NSPERSEC 1000000000ULL #ifdef __unix__ #include #include #include #include static char **_sys_glob(char *pattern, int *num_files) { int i = 0; char **files = NULL; glob_t result; glob(pattern, GLOB_MARK, NULL, &result); files = (char **)calloc(result.gl_pathc + 1, sizeof(char *)); for (i = 0 ; i < result.gl_pathc; i++) { files[i] = strdup(result.gl_pathv[i]); } if (num_files) *num_files = result.gl_pathc; globfree(&result); return files; } static int _sys_mkdir(char *path) { int rc = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); return (rc == 0 || errno == EEXIST)? 0:rc; } static int _sys_chdir(char *dir) { return chdir(dir); } static char *_sys_getcwd(void) { return getcwd(NULL, 0); } static int _sys_set_time(char *filename, time_t timestamp) { struct utimbuf timbuf; timbuf.actime = timestamp; timbuf.modtime = timestamp; return utime(filename, &timbuf); } #endif /* __unix__ */ #ifdef _WIN32 #include #include #include static char **_sys_glob(char *pattern, int *num_files) { char **files = NULL; int n = 0; WIN32_FIND_DATA f; HANDLE h = FindFirstFile(pattern, &f); if (h != INVALID_HANDLE_VALUE) { do { files = (char **)realloc(files, sizeof(char *) * (n + 1)); files[n] = strdup(f.cFileName); n++; } while (FindNextFile(h, &f)); files = (char **)realloc(files, sizeof(char *) * (n + 1)); files[n] = NULL; FindClose(h); } if (num_files) *num_files = n; return files; } static int _sys_mkdir(char *path) { int rc = _mkdir(path); return (rc == 0 || errno == EEXIST)? 0:rc; } static int _sys_chdir(char *dir) { return _chdir(dir); } static char *_sys_getcwd(void) { return _getcwd(NULL, 0); } static int _sys_set_time(char *filename, time_t timestamp) { struct _utimbuf timbuf; timbuf.actime = timestamp; timbuf.modtime = timestamp; return _utime(filename, &timbuf); } #endif /* _WIN32 */ char **sys_glob(char *parent, char *pattern, int *num_files) { int rc = 0; char *cwd = NULL; char **files = NULL; *num_files = 0; cwd = sys_getcwd(); if (cwd == NULL) return NULL; rc = sys_chdir(parent); if (rc != 0) { free(cwd); return NULL; } files = _sys_glob(pattern, num_files); sys_chdir(cwd); free(cwd); return files; } void sys_glob_free(char **files) { if (files) { int i; for(i = 0; files[i]; i++) { free(files[i]); files[i] = NULL; } free(files); } } int sys_mkdir(char *parent, char *dir) { int rc = 0; char *cwd = NULL; rc = _sys_mkdir(parent); if (rc != 0) return rc; cwd = sys_getcwd(); if (cwd == NULL) return -1; rc = sys_chdir(parent); if (rc != 0) { free(cwd); return -1; } rc = _sys_mkdir(dir); sys_chdir(cwd); free(cwd); return rc; } int sys_chdir(char *dir) { if (dir == NULL) return -1; return _sys_chdir(dir); } char *sys_getcwd(void) { return _sys_getcwd(); } unsigned long long sys_filesize(char *parent, char *filename) { int rc = 0; unsigned long long size = 0; char *cwd = NULL; struct stat buf; cwd = sys_getcwd(); if (cwd == NULL) return -1; rc = sys_chdir(parent); if (rc != 0) { free(cwd); return -1; } rc = stat(filename, &buf); size = (rc == 0)? buf.st_size:-1; sys_chdir(cwd); free(cwd); return size; } int sys_delete(char *parent, char *filename) { int rc = 0; char *cwd = NULL; cwd = sys_getcwd(); if (cwd == NULL) return -1; rc = sys_chdir(parent); if (rc != 0) { free(cwd); return -1; } rc = unlink(filename); sys_chdir(cwd); free(cwd); return rc; } int sys_set_time(char *filename, time_t timestamp) { return _sys_set_time(filename, timestamp); } int sys_set_filetime(char *filename, filetime_t filetime) { filetime_t t = (filetime - JAN1ST1970) / ((unsigned long long) (NSPERSEC / 100)); return sys_set_time(filename, (time_t)t); } char *sys_basename(char *path) { return basename(path); } char *sys_dirname(char *path) { return dirname(path); } void sys_fread_long_long(long long *value, FILE *file) { #ifndef WORDS_BIGENDIAN fread(value, 1, sizeof(long long), file); #else /* the following code is endianness neutral */ long long llw = 0; llw = (long long) (fgetc(file) & 0xFF); llw |= ((long long) (fgetc(file) & 0xFF) << 0x08); llw |= ((long long) (fgetc(file) & 0xFF) << 0x10); llw |= ((long long) (fgetc(file) & 0xFF) << 0x18); llw |= ((long long) (fgetc(file) & 0xFF) << 0x20); llw |= ((long long) (fgetc(file) & 0xFF) << 0x28); llw |= ((long long) (fgetc(file) & 0xFF) << 0x30); llw |= ((long long) (fgetc(file) & 0xFF) << 0x38); *value = llw; #endif } void sys_fread_int(int *value, FILE *file) { #ifndef WORDS_BIGENDIAN fread(value, 1, sizeof(int), file); #else /* the following code is endianness neutral */ int dw = 0; dw = (int) (fgetc(file) & 0xFF); dw |= ((int) (fgetc(file) & 0xFF) << 0x08); dw |= ((int) (fgetc(file) & 0xFF) << 0x10); dw |= ((int) (fgetc(file) & 0xFF) << 0x18); *value = dw; #endif } void sys_fread_short(short *value, FILE *file) { #ifndef WORDS_BIGENDIAN fread(value, 1, sizeof(short), file); #else /* the following code is endianness neutral */ short w = 0; w = (short) (fgetc(file) & 0xFF); w |= ((short) (fgetc(file) & 0xFF) << 0x08); *value = w; #endif } undbx-0.20/aclocal.m40000644000175000017500000010346311373235657011357 00000000000000# generated automatically by aclocal 1.11.1 -*- Autoconf -*- # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, # 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc. # This file is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; without # even the implied warranty of MERCHANTABILITY or FITNESS FOR A # PARTICULAR PURPOSE. m4_ifndef([AC_AUTOCONF_VERSION], [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.65],, [m4_warning([this file was generated for autoconf 2.65. 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Copyright (C) 2008, 2009 Ulrich Krebs RFC-2822 and RFC-2047 parsing code is adapted from GNU Mailutils - a suite of utilities for electronic mail, Copyright (C) 2002, 2003, 2004, 2005, 2006, 2009, 2010 Free Software Foundation, Inc. This file is part of UnDBX. UnDBX 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 3 of the License, 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, see . */ #ifndef _DBX_READ_H_ #define _DBX_READ_H_ #ifdef __cplusplus extern "C" { #endif #include "dbxsys.h" #define DBX_MAX_FILENAME 128 typedef int (*dbx_cmpfunc_t)(const void *, const void *); typedef enum { DBX_TYPE_UNKNOWN, DBX_TYPE_EMAIL, DBX_TYPE_OE4, DBX_TYPE_FOLDER } dbx_type_t; typedef enum { DBX_MASK_INDEX = 0x01, DBX_MASK_FLAGS = 0x02, DBX_MASK_BODYLINES = 0x04, DBX_MASK_MSGADDR = 0x08, DBX_MASK_MSGPRIO = 0x10, DBX_MASK_MSGSIZE = 0x20 } dbx_mask_t; typedef enum { DBX_SCAN_MESSAGES, DBX_SCAN_DELETED, DBX_SCAN_NUM } dbx_scan_t; typedef struct dbx_fragment_s { unsigned int offset; unsigned int offset_next; unsigned int size; int prev; int next; } dbx_fragment_t; typedef struct dbx_chains_s { int fragment_count; dbx_fragment_t *fragments; int count; dbx_fragment_t **chains; } dbx_chains_t; typedef struct dbx_info_s { int index; char *filename; dbx_mask_t valid; unsigned int message_index; unsigned int flags; filetime_t send_create_time; unsigned int body_lines; unsigned int message_address; char *original_subject; filetime_t save_time; char *message_id; char *subject; char *sender_address_and_name; char *message_id_replied_to; char *server_newsgroup_message_number; char *server; char *sender_name; char *sender_address; unsigned int message_priority; unsigned int message_size; filetime_t receive_create_time; char *receiver_name; char *receiver_address; char *account_name; char *account_registry_key; } dbx_info_t; typedef struct dbx_s { char *filename; FILE *file; int recover; unsigned long long file_size; dbx_type_t type; int message_count; int capacity; dbx_info_t *info; dbx_chains_t scan[DBX_SCAN_NUM]; } dbx_t; dbx_t *dbx_open(char *filename, int recover); void dbx_close(dbx_t *dbx); char *dbx_message(dbx_t *dbx, int msg_number, unsigned int *psize); char *dbx_recover_message(dbx_t *dbx, int chain_index, int msg_number, unsigned int *psize, time_t *ptimestamp, char **pfilename); #ifdef __cplusplus }; #endif #endif /* _DBX_READ_H_ */ undbx-0.20/undbx.c0000644000175000017500000003040011373072002010750 00000000000000/* UnDBX - Tool to extract e-mail messages from Outlook Express DBX files. Copyright (C) 2008-2010 Avi Rozen DBX file format parsing code is based on DbxConv - a DBX to MBOX Converter. Copyright (C) 2008, 2009 Ulrich Krebs RFC-2822 and RFC-2047 parsing code is adapted from GNU Mailutils - a suite of utilities for electronic mail, Copyright (C) 2002, 2003, 2004, 2005, 2006, 2009, 2010 Free Software Foundation, Inc. This file is part of UnDBX. UnDBX 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 3 of the License, 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, see . */ #ifdef HAVE_CONFIG_H # include # define DBX_VERSION PACKAGE_VERSION #endif #include #include #include #include #include "dbxread.h" typedef enum { DBX_SAVE_NOOP, DBX_SAVE_OK, DBX_SAVE_ERROR } dbx_save_status_t; static int _str_cmp(const char **ia, const char **ib) { return strcmp(*ia, *ib); } static dbx_save_status_t _save_message(char *dir, char *filename, char *message, unsigned int size) { FILE *eml = NULL; char *cwd = NULL; size_t b = 0; int rc = 0; cwd = sys_getcwd(); if (cwd == NULL) { perror("_save_message (sys_getcwd)"); return DBX_SAVE_ERROR; } rc = sys_chdir(dir); if (rc != 0) { perror("_save_message (sys_chdir)"); return DBX_SAVE_ERROR; } eml = fopen(filename, "wb"); sys_chdir(cwd); free(cwd); cwd = NULL; if (eml == NULL) { perror("_save_message (fopen)"); return DBX_SAVE_ERROR; } b = fwrite(message, 1, size, eml); if (b != size) { perror("_save_message (fwrite)"); return DBX_SAVE_ERROR; } fclose(eml); return DBX_SAVE_OK; } static void _set_message_time(char *dir, char *filename, time_t timestamp) { char *cwd = NULL; int rc = 0; cwd = sys_getcwd(); if (cwd == NULL) { perror("_set_message_time (sys_getcwd)"); return; } rc = sys_chdir(dir); if (rc != 0) { perror("_set_message_time (sys_chdir)"); return; } sys_set_time(filename, timestamp); sys_chdir(cwd); free(cwd); cwd = NULL; } static void _set_message_filetime(dbx_info_t *info, char *dir) { char *cwd = NULL; int rc = 0; filetime_t filetime = 0; cwd = sys_getcwd(); if (cwd == NULL) { perror("_set_message_filetime (sys_getcwd)"); return; } rc = sys_chdir(dir); if (rc != 0) { perror("_set_message_filetime (sys_chdir)"); return; } filetime = info->send_create_time? info->send_create_time : info->receive_create_time; sys_set_filetime(info->filename, filetime); sys_chdir(cwd); free(cwd); cwd = NULL; } static dbx_save_status_t _maybe_save_message(dbx_t *dbx, int imessage, char *dir, int force) { dbx_save_status_t status = DBX_SAVE_NOOP; dbx_info_t *info = dbx->info + imessage; unsigned long long size = 0; unsigned int message_size = 0; char *message = NULL; if (!force) size = sys_filesize(dir, info->filename); if (force || (info->valid & DBX_MASK_MSGSIZE) == 0 || size != info->message_size) { message = dbx_message(dbx, imessage, &message_size); if (force || (size != message_size)) { status = _save_message(dir, info->filename, message, message_size); switch (status) { case DBX_SAVE_ERROR: printf("%5.1f%% ERROR: %s\n", 100 * (imessage + 1.0)/dbx->message_count, info->filename); fflush(stdout); break; case DBX_SAVE_OK: _set_message_filetime(info, dir); printf("%5.1f%% OK: %s\n", 100 * (imessage + 1.0)/dbx->message_count, info->filename); fflush(stdout); break; default: break; } } free(message); } return status; } static void _recover(dbx_t *dbx, char *out_dir, char *eml_dir, int *saved, int *errors) { int i = 0; const char *scan_type[DBX_SCAN_NUM] = { "messages", "deleted message fragments" }; for(i = 0; i < DBX_SCAN_NUM; i++) { int s = 0; int e = 0; dbx_save_status_t status = DBX_SAVE_NOOP; int imessage = 0; char *message = NULL; char *filename = NULL; unsigned int size = 0; time_t timestamp = 0; if (dbx->scan[i].count > 0) { char *dest_dir = strdup(eml_dir); if (i) { dest_dir = (char *)realloc(dest_dir, sizeof(char) * (strlen(dest_dir) + strlen("/deleted") + 1)); strcat(dest_dir, "/deleted"); } printf("------ Recovering %d %s from %s to %s/%s ... \n", dbx->scan[i].count, scan_type[i], dbx->filename, out_dir, dest_dir); if (i) { int rc = sys_mkdir(eml_dir, "deleted"); if (rc != 0) { perror("_recover (sys_mkdir)"); break; } } for (imessage = 0; imessage < dbx->scan[i].count; imessage++) { message = dbx_recover_message(dbx, i, imessage, &size, ×tamp, &filename); if (message) { status = _save_message(dest_dir, filename, message, size); switch (status) { case DBX_SAVE_ERROR: e++; printf("%5.1f%% ERROR: %s\n", 100 * (imessage + 1.0)/dbx->scan[i].count, filename); fflush(stdout); break; case DBX_SAVE_OK: s++; _set_message_time(dest_dir, filename, timestamp); printf("%5.1f%% OK: %s\n", 100 * (imessage + 1.0)/dbx->scan[i].count, filename); fflush(stdout); break; default: break; } } free(filename); free(message); } free(dest_dir); printf("------ %d %s recovered, %d errors\n", s, scan_type[i], e); fflush(stdout); } *saved += s; *errors += e; } } static void _extract(dbx_t *dbx, char *out_dir, char *eml_dir, int *saved, int *deleted, int *errors) { int no_more_messages = 0; int no_more_files = 0; char **eml_files = NULL; int num_eml_files = 0; int imessage = 0; int ifile = 0; printf("------ Extracting %d messages from %s to %s/%s ... \n", dbx->message_count, dbx->filename, out_dir, eml_dir); fflush(stdout); eml_files = sys_glob(eml_dir, "*.eml", &num_eml_files); no_more_messages = (imessage == dbx->message_count); no_more_files = (ifile == num_eml_files); qsort(eml_files, num_eml_files, sizeof(char *), (dbx_cmpfunc_t) _str_cmp); while (!no_more_messages || !no_more_files) { dbx_save_status_t status = DBX_SAVE_NOOP; int cond; if (!no_more_messages && !no_more_files) { cond = strcmp(dbx->info[imessage].filename, eml_files[ifile]); } else if (no_more_files) cond = -1; else cond = 1; if (cond < 0) { /* message not found on disk: extract from dbx */ status = _maybe_save_message(dbx, imessage, eml_dir, 1); imessage++; no_more_messages = (imessage == dbx->message_count); } else if (cond == 0) { /* message found on disk: extract from dbx if modified */ status = _maybe_save_message(dbx, imessage, eml_dir, 0); imessage++; no_more_messages = (imessage == dbx->message_count); ifile++; no_more_files = (ifile == num_eml_files); } else { /* file on disk not found in dbx: delete from disk */ sys_delete(eml_dir, eml_files[ifile]); printf(" DELETE: %s\n", eml_files[ifile]); ifile++; no_more_files = (ifile == num_eml_files); (*deleted)++; } if (status == DBX_SAVE_OK) (*saved)++; if (status == DBX_SAVE_ERROR) (*errors)++; } printf("------ %d messages saved, %d skipped, %d errors, %d files deleted\n", *saved, dbx->message_count - *saved - *errors, *errors, *deleted); fflush(stdout); sys_glob_free(eml_files); } static int _undbx(char *dbx_dir, char *out_dir, char *dbx_file, int recover) { int deleted = 0; int saved = 0; int errors = 0; dbx_t *dbx = NULL; char *eml_dir = NULL; char *cwd = NULL; int rc = -1; cwd = sys_getcwd(); if (cwd == NULL) { fprintf(stderr, "error: can't get current working directory\n"); goto UNDBX_DONE; } rc = sys_chdir(dbx_dir); if (rc != 0) { fprintf(stderr, "error: can't chdir to %s\n", dbx_dir); goto UNDBX_DONE; } dbx = dbx_open(dbx_file, recover); sys_chdir(cwd); if (dbx == NULL) { fprintf(stderr, "warning: can't open DBX file %s\n", dbx_file); rc = -1; goto UNDBX_DONE; } if (!recover && dbx->type != DBX_TYPE_EMAIL) { fprintf(stderr, "warning: DBX file %s does not contain messages\n", dbx_file); rc = -1; goto UNDBX_DONE; } if (!recover && dbx->file_size >= 0x80000000) { fprintf(stderr, "warning: DBX file %s is corrupted (larger than 2GB)\n" " consider running in recovery mode with --recover command line option\n", dbx_file); } eml_dir = strdup(dbx_file); eml_dir[strlen(eml_dir) - 4] = '\0'; rc = sys_mkdir(out_dir, eml_dir); if (rc != 0) { fprintf(stderr, "error: can't create directory %s/%s\n", out_dir, eml_dir); goto UNDBX_DONE; } rc = sys_chdir(out_dir); if (rc != 0) { fprintf(stderr, "error: can't chdir to %s\n", out_dir); goto UNDBX_DONE; } if (recover) _recover(dbx, out_dir, eml_dir, &saved, &errors); else _extract(dbx, out_dir, eml_dir, &saved, &deleted, &errors); UNDBX_DONE: free(eml_dir); eml_dir = NULL; dbx_close(dbx); sys_chdir(cwd); free(cwd); cwd = NULL; return rc; } static char **_get_files(char **dir, int *num_files) { char **files = NULL; int l = strlen(*dir); files = sys_glob(*dir, "*.dbx", num_files); if (*num_files == 0 && l > 4 && strcasecmp(*dir + l - 4, ".dbx") == 0) { char *dirname = NULL; sys_glob_free(files); files = (char **)calloc(2, sizeof(char *)); files[0] = strdup(sys_basename(*dir)); *num_files = 1; dirname = strdup(sys_dirname(*dir)); free(*dir); *dir = dirname; } return files; } static void _usage(char *prog, int rc) { FILE *stream = (rc == EXIT_SUCCESS)? stdout:stderr; if (rc != EXIT_SUCCESS) fprintf(stream, "error: bad command line\n"); fprintf(stream, "Usage: %s [