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sortix--sortix/utils/mv.cpp
2015-12-12 19:28:07 +01:00

256 lines
6.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
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 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 <http://www.gnu.org/licenses/>.
mv.cpp
Rename files and directories.
*******************************************************************************/
#include <sys/stat.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
char* basename_dup(const char* path)
{
char* copy = strdup(path);
if ( !copy )
return (char*) NULL;
char* result = strdup(basename(copy));
free(copy);
if ( !result )
return (char*) NULL;
return result;
}
const int FLAG_VERBOSE = 1 << 0;
const int FLAG_ASK_OVERWRITE = 1 << 1;
bool mv(int src_dirfd, const char* src_rel, const char* src_path,
int dst_dirfd, const char* dst_rel, const char* dst_path,
int flags)
{
if ( flags & FLAG_VERBOSE )
printf("`%s' -> `%s'\n", src_path, dst_path);
if ( flags & FLAG_ASK_OVERWRITE )
{
// TODO: Ask for confirmation if needed.
}
if ( renameat(src_dirfd, src_rel, dst_dirfd, dst_rel) < 0 )
{
error(0, errno, "renaming `%s' to `%s'", src_path, dst_path);
return false;
}
return true;
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void help(FILE* fp, const char* argv0)
{
fprintf(fp, "Usage: %s [OPTION]... [-T] SOURCE DEST\n", argv0);
fprintf(fp, " or: %s [OPTION]... SOURCE... DIRECTORY\n", argv0);
fprintf(fp, " or: %s [OPTION]... -t DIRECTORY SOURCE...\n", argv0);
}
static void version(FILE* fp, const char* argv0)
{
fprintf(fp, "%s (Sortix) %s\n", argv0, VERSIONSTR);
fprintf(fp, "License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.\n");
fprintf(fp, "This is free software: you are free to change and redistribute it.\n");
fprintf(fp, "There is NO WARRANTY, to the extent permitted by law.\n");
}
int main(int argc, char* argv[])
{
int flags = 0;
bool flag_no_target_directory = false;
const char* target_directory = NULL;
const char* argv0 = argv[0];
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
while ( char c = *++arg ) switch ( c )
{
case 'f': flags &= ~FLAG_ASK_OVERWRITE; break;
#if 0
case 'i': flags |= FLAG_ASK_OVERWRITE; break;
case 'n': flags |= FLAG_NO_CLOBBER; break;
#endif
case 't':
if ( *(arg + 1) )
target_directory = arg + 1;
else if ( i + 1 == argc )
{
error(0, 0, "option requires an argument -- '%c'", c);
fprintf(stderr, "Try '%s --help' for more information\n", argv0);
exit(1);
}
else
{
target_directory = argv[i+1];
argv[++i] = NULL;
}
arg = "t";
break;
case 'T': flag_no_target_directory = true; break;
#if 0
case 'u': flags |= FLAG_UPDATE; break;
#endif
case 'v': flags |= FLAG_VERBOSE; break;
default:
fprintf(stderr, "%s: unknown option -- '%c'\n", argv0, c);
help(stderr, argv0);
exit(1);
}
}
else if ( !strcmp(arg, "--target-directory") )
{
if ( i + 1 == argc )
{
error(0, 0, "option '--target-directory 'requires an argument");
fprintf(stderr, "Try '%s --help' for more information\n", argv0);
exit(1);
}
target_directory = argv[++i];
argv[i] = NULL;
}
else if ( !strncmp(arg, "--target-directory=", strlen("--target-directory=")) )
target_directory = arg + strlen("--target-directory=");
else if ( !strcmp(arg, "--no-target-directory") )
flag_no_target_directory = true;
else if ( !strcmp(arg, "--help") )
help(stdout, argv0), exit(0);
else if ( !strcmp(arg, "--version") )
version(stdout, argv0), exit(0);
else
{
fprintf(stderr, "%s: unknown option: %s\n", argv0, arg);
help(stderr, argv0);
exit(1);
}
}
if ( target_directory && flag_no_target_directory )
error(1, 0, "cannot combine --target-directory (-t) and --no-target-directory (-T)");
compact_arguments(&argc, &argv);
if ( argc < 2 )
error(1, 0, "missing file operand");
if ( !target_directory && !flag_no_target_directory && argc == 3 )
{
const char* dst = argv[2];
struct stat dst_st;
if ( stat(dst, &dst_st) < 0 )
flag_no_target_directory = true;
else if ( !S_ISDIR(dst_st.st_mode) )
flag_no_target_directory = true;
}
if ( flag_no_target_directory )
{
const char* src = argv[1];
if ( argc < 3 )
error(1, 0, "missing destination file operand after `%s'", src);
const char* dst = argv[2];
if ( 3 < argc )
error(1, 0, "extra operand `%s'", argv[3]);
return mv(AT_FDCWD, src, src,
AT_FDCWD, dst, dst,
flags) ? 0 : 1;
}
if ( !target_directory )
{
target_directory = argv[--argc];
argv[argc] = NULL;
}
int dst_dirfd = open(target_directory, O_RDONLY | O_DIRECTORY);
if ( dst_dirfd < 0 )
error(1, errno, "`%s'", target_directory);
if ( argc < 2 )
error(1, 0, "missing file operand");
const char* join = "/";
if ( strlen(target_directory) &&
target_directory[strlen(target_directory)-1] == '/' )
join = "";
bool success = true;
for ( int i = 1; i < argc; i++ )
{
const char* src = argv[i];
int src_dirfd = AT_FDCWD;
const char* src_rel = src;
const char* src_path = src;
char* dst_rel = basename_dup(src_path);
if ( !dst_rel )
{
error(0, errno, "strdup");
success = false;
continue;
}
char* dst_path = NULL;
asprintf(&dst_path, "%s%s%s", target_directory, join, dst_rel);
if ( !dst_path )
{
error(0, errno, "asprintf");
free(dst_rel);
success = false;
continue;
}
if ( !mv(src_dirfd, src_rel, src_path,
dst_dirfd, dst_rel, dst_path,
flags) )
success = false;
free(dst_path);
free(dst_rel);
}
close(dst_dirfd);
return success ? 0 : 1;
}