1850d5ec0
Denys Vlasenko
2015-03-22
Subject
truncate: new applet
Binary
No binary (build failed)
Architecture & Compiler Flags
—
Build Log
(log yok)
Commit Diff GitHub →
coreutils/truncate.c+77 -0
| @@ -0,0 +1,77 @@ | |
| + | /* |
| + | * Mini truncate implementation for busybox |
| + | * |
| + | * Copyright (C) 2015 by Ari Sundholm <[email protected]> |
| + | * |
| + | * 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 = xopen(*argv, flags); |
| + | if (ftruncate(fd, size) == -1) { |
| + | bb_perror_msg("%s: ftruncate", *argv); |
| + | ret = EXIT_FAILURE; |
| + | } |
| + | xclose(fd); |
| + | ++argv; |
| + | } |
| + | |
| + | return ret; |
| + | } |