mirror of
https://github.com/sheumann/hush.git
synced 2024-11-17 10:07:19 +00:00
fc3e40ee81
Additionally, open(2) failures do not make the program die immediately. This makes the behavior of the program match coreutils more closely. function old new delta truncate_main 161 221 +60 Signed-off-by: Ari Sundholm <ari@tuxera.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
|
|
* Mini truncate implementation for busybox
|
|
*
|
|
* Copyright (C) 2015 by Ari Sundholm <ari@tuxera.com>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
//config:config TRUNCATE
|
|
//config: bool "truncate"
|
|
//config: default y
|
|
//config: help
|
|
//config: truncate truncates files to a given size. If a file does
|
|
//config: not exist, it is created unless told otherwise.
|
|
|
|
//kbuild:lib-$(CONFIG_TRUNCATE) += truncate.o
|
|
//applet:IF_TRUNCATE(APPLET_NOFORK(truncate, truncate, BB_DIR_USR_BIN, BB_SUID_DROP, truncate))
|
|
|
|
//usage:#define truncate_trivial_usage
|
|
//usage: "[-c] -s SIZE FILE..."
|
|
//usage:#define truncate_full_usage "\n\n"
|
|
//usage: "Truncate FILEs to the given size\n"
|
|
//usage: "\n -c Do not create files"
|
|
//usage: "\n -s SIZE Truncate to SIZE"
|
|
//usage:
|
|
//usage:#define truncate_example_usage
|
|
//usage: "$ truncate -s 1G foo"
|
|
|
|
#include "libbb.h"
|
|
|
|
#if ENABLE_LFS
|
|
# define XATOU_SFX xatoull_sfx
|
|
#else
|
|
# define XATOU_SFX xatoul_sfx
|
|
#endif
|
|
|
|
/* This is a NOFORK applet. Be very careful! */
|
|
|
|
int truncate_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int truncate_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
unsigned opts;
|
|
int flags = O_RDWR;
|
|
int ret = EXIT_SUCCESS;
|
|
char *size_str;
|
|
off_t size;
|
|
|
|
enum {
|
|
OPT_NOCREATE = (1 << 0),
|
|
OPT_SIZE = (1 << 1),
|
|
};
|
|
|
|
opt_complementary = "s:-1";
|
|
opts = getopt32(argv, "cs:", &size_str);
|
|
|
|
if (!(opts & OPT_NOCREATE))
|
|
flags |= O_CREAT;
|
|
|
|
// TODO: coreutils 8.17 also support "m" (lowercase) suffix
|
|
// with truncate, but not with dd!
|
|
// We share kMG_suffixes[], so we can't make both tools
|
|
// compatible at once...
|
|
size = XATOU_SFX(size_str, kMG_suffixes);
|
|
|
|
argv += optind;
|
|
while (*argv) {
|
|
int fd = open(*argv, flags);
|
|
if (fd < 0) {
|
|
if (errno != ENOENT || !(opts & OPT_NOCREATE)) {
|
|
bb_perror_msg("%s: open", *argv);
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
/* else: ENOENT && OPT_NOCREATE:
|
|
* do not report error, exitcode is also 0.
|
|
*/
|
|
} else {
|
|
if (ftruncate(fd, size) == -1) {
|
|
bb_perror_msg("%s: truncate", *argv);
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
xclose(fd);
|
|
}
|
|
++argv;
|
|
}
|
|
|
|
return ret;
|
|
}
|