path: root/coreutils/dos2unix.c (plain)
blob: 6d2347163364ccf21024875b0c18b2dd5cebf444

1	/* vi: set sw=4 ts=4: */
2	/*
3	* dos2unix for BusyBox
4	*
5	* dos2unix '\n' convertor 0.5.0
6	* based on Unix2Dos 0.9.0 by Peter Hanecak (made 19.2.1997)
7	* Copyright 1997,.. by Peter Hanecak <hanecak@megaloman.sk>.
8	* All rights reserved.
9	*
10	* dos2unix filters reading input from stdin and writing output to stdout.
11	*
12	* Licensed under GPLv2 or later, see file LICENSE in this source tree.
13	*/
14	//config:config DOS2UNIX
15	//config: bool "dos2unix"
16	//config: default y
17	//config: help
18	//config: dos2unix is used to convert a text file from DOS format to
19	//config: UNIX format, and vice versa.
20	//config:
21	//config:config UNIX2DOS
22	//config: bool "unix2dos"
23	//config: default y
24	//config: help
25	//config: unix2dos is used to convert a text file from UNIX format to
26	//config: DOS format, and vice versa.
27
28	//applet:IF_DOS2UNIX(APPLET_NOEXEC(dos2unix, dos2unix, BB_DIR_USR_BIN, BB_SUID_DROP, dos2unix))
29	//applet:IF_UNIX2DOS(APPLET_NOEXEC(unix2dos, dos2unix, BB_DIR_USR_BIN, BB_SUID_DROP, unix2dos))
30
31	//kbuild:lib-$(CONFIG_DOS2UNIX) += dos2unix.o
32	//kbuild:lib-$(CONFIG_UNIX2DOS) += dos2unix.o
33
34	//usage:#define dos2unix_trivial_usage
35	//usage: "[-ud] [FILE]"
36	//usage:#define dos2unix_full_usage "\n\n"
37	//usage: "Convert FILE in-place from DOS to Unix format.\n"
38	//usage: "When no file is given, use stdin/stdout.\n"
39	//usage: "\n -u dos2unix"
40	//usage: "\n -d unix2dos"
41	//usage:
42	//usage:#define unix2dos_trivial_usage
43	//usage: "[-ud] [FILE]"
44	//usage:#define unix2dos_full_usage "\n\n"
45	//usage: "Convert FILE in-place from Unix to DOS format.\n"
46	//usage: "When no file is given, use stdin/stdout.\n"
47	//usage: "\n -u dos2unix"
48	//usage: "\n -d unix2dos"
49
50	#include "libbb.h"
51
52	/* This is a NOEXEC applet. Be very careful! */
53
54	enum {
55	CT_UNIX2DOS = 1,
56	CT_DOS2UNIX
57	};
58
59	/* if fn is NULL then input is stdin and output is stdout */
60	static void convert(char *fn, int conv_type)
61	{
62	FILE *in, *out;
63	int ch;
64	char *temp_fn = temp_fn; /* for compiler */
65	char *resolved_fn = resolved_fn;
66
67	in = stdin;
68	out = stdout;
69	if (fn != NULL) {
70	struct stat st;
71	int fd;
72
73	resolved_fn = xmalloc_follow_symlinks(fn);
74	if (resolved_fn == NULL)
75	bb_simple_perror_msg_and_die(fn);
76	in = xfopen_for_read(resolved_fn);
77	xfstat(fileno(in), &st, resolved_fn);
78
79	temp_fn = xasprintf("%sXXXXXX", resolved_fn);
80	fd = xmkstemp(temp_fn);
81	if (fchmod(fd, st.st_mode) == -1)
82	bb_simple_perror_msg_and_die(temp_fn);
83	fchown(fd, st.st_uid, st.st_gid);
84
85	out = xfdopen_for_write(fd);
86	}
87
88	while ((ch = fgetc(in)) != EOF) {
89	if (ch == '\r')
90	continue;
91	if (ch == '\n')
92	if (conv_type == CT_UNIX2DOS)
93	fputc('\r', out);
94	fputc(ch, out);
95	}
96
97	if (fn != NULL) {
98	if (fclose(in) < 0 || fclose(out) < 0) {
99	unlink(temp_fn);
100	bb_perror_nomsg_and_die();
101	}
102	xrename(temp_fn, resolved_fn);
103	free(temp_fn);
104	free(resolved_fn);
105	}
106	}
107
108	int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
109	int dos2unix_main(int argc UNUSED_PARAM, char **argv)
110	{
111	int o, conv_type;
112
113	/* See if we are supposed to be doing dos2unix or unix2dos */
114	if (ENABLE_DOS2UNIX
115	&& (!ENABLE_UNIX2DOS || applet_name[0] == 'd')
116	) {
117	conv_type = CT_DOS2UNIX;
118	} else {
119	conv_type = CT_UNIX2DOS;
120	}
121
122	/* -u convert to unix, -d convert to dos */
123	opt_complementary = "u--d:d--u"; /* mutually exclusive */
124	o = getopt32(argv, "du");
125
126	/* Do the conversion requested by an argument else do the default
127	* conversion depending on our name. */
128	if (o)
129	conv_type = o;
130
131	argv += optind;
132	do {
133	/* might be convert(NULL) if there is no filename given */
134	convert(*argv, conv_type);
135	} while (*argv && *++argv);
136
137	return 0;
138	}
139