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/* vi: set sw=4 ts=4: */
* dos2unix for BusyBox
* dos2unix '\n' converter 0.5.0
* based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
* Copyright 1997,.. by Peter Hanecak <>.
* All rights reserved.
* dos2unix filters reading input from stdin and writing output to stdout.
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
//config:config DOS2UNIX
//config: bool "dos2unix"
//config: default y
//config: help
//config: dos2unix is used to convert a text file from DOS format to
//config: UNIX format, and vice versa.
//config:config UNIX2DOS
//config: bool "unix2dos"
//config: default y
//config: help
//config: unix2dos is used to convert a text file from UNIX format to
//config: DOS format, and vice versa.
//applet:IF_DOS2UNIX(APPLET_NOEXEC(dos2unix, dos2unix, BB_DIR_USR_BIN, BB_SUID_DROP, dos2unix))
//applet:IF_UNIX2DOS(APPLET_NOEXEC(unix2dos, dos2unix, BB_DIR_USR_BIN, BB_SUID_DROP, unix2dos))
//kbuild:lib-$(CONFIG_DOS2UNIX) += dos2unix.o
//kbuild:lib-$(CONFIG_UNIX2DOS) += dos2unix.o
//usage:#define dos2unix_trivial_usage
//usage: "[-ud] [FILE]"
//usage:#define dos2unix_full_usage "\n\n"
//usage: "Convert FILE in-place from DOS to Unix format.\n"
//usage: "When no file is given, use stdin/stdout.\n"
//usage: "\n -u dos2unix"
//usage: "\n -d unix2dos"
//usage:#define unix2dos_trivial_usage
//usage: "[-ud] [FILE]"
//usage:#define unix2dos_full_usage "\n\n"
//usage: "Convert FILE in-place from Unix to DOS format.\n"
//usage: "When no file is given, use stdin/stdout.\n"
//usage: "\n -u dos2unix"
//usage: "\n -d unix2dos"
#include "libbb.h"
/* This is a NOEXEC applet. Be very careful! */
enum {
/* if fn is NULL then input is stdin and output is stdout */
static void convert(char *fn, int conv_type)
FILE *in, *out;
int ch;
char *temp_fn = temp_fn; /* for compiler */
char *resolved_fn = resolved_fn;
in = stdin;
out = stdout;
if (fn != NULL) {
struct stat st;
int fd;
resolved_fn = xmalloc_follow_symlinks(fn);
if (resolved_fn == NULL)
in = xfopen_for_read(resolved_fn);
xfstat(fileno(in), &st, resolved_fn);
temp_fn = xasprintf("%sXXXXXX", resolved_fn);
fd = xmkstemp(temp_fn);
if (fchmod(fd, st.st_mode) == -1)
fchown(fd, st.st_uid, st.st_gid);
out = xfdopen_for_write(fd);
while ((ch = fgetc(in)) != EOF) {
if (ch == '\r')
if (ch == '\n')
if (conv_type == CT_UNIX2DOS)
fputc('\r', out);
fputc(ch, out);
if (fn != NULL) {
if (fclose(in) < 0 || fclose(out) < 0) {
xrename(temp_fn, resolved_fn);
int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int dos2unix_main(int argc UNUSED_PARAM, char **argv)
int o, conv_type;
/* See if we are supposed to be doing dos2unix or unix2dos */
&& (!ENABLE_UNIX2DOS || applet_name[0] == 'd')
) {
conv_type = CT_DOS2UNIX;
} else {
conv_type = CT_UNIX2DOS;
/* -u convert to unix, -d convert to dos */
opt_complementary = "u--d:d--u"; /* mutually exclusive */
o = getopt32(argv, "du");
/* Do the conversion requested by an argument else do the default
* conversion depending on our name. */
if (o)
conv_type = o;
argv += optind;
do {
/* might be convert(NULL) if there is no filename given */
convert(*argv, conv_type);
} while (*argv && *++argv);
return 0;