dos2unix.c revision f91b7c89bc852868692b9518185421ebb52d67b3 
1/* vi: set sw=4 ts=4:
2 *
3 * dos2unix.c - convert newline format
4 *
5 * Copyright 2012 Rob Landley <rob@landley.net>
6
7USE_DOS2UNIX(NEWTOY(dos2unix, NULL, TOYFLAG_BIN))
8USE_DOS2UNIX(OLDTOY(unix2dos, dos2unix, NULL, TOYFLAG_BIN))
9
10config DOS2UNIX
11	bool "dos2unix/unix2dos"
12	default y
13	help
14	  usage: dos2unix/unix2dos [file...]
15
16	  Convert newline format between dos (\r\n) and unix (just \n)
17	  If no files listed copy from stdin, "-" is a synonym for stdin.
18*/
19
20#include "toys.h"
21
22DEFINE_GLOBALS(
23	char *tempfile;
24)
25
26#define TT this.dos2unix
27
28static void do_dos2unix(int fd, char *name)
29{
30	char c = toys.which->name[0];
31	int outfd = 1, catch = 0;
32
33	if (fd) outfd = copy_tempfile(fd, name, &TT.tempfile);
34
35	for (;;) {
36		int len, in, out;
37
38		len = read(fd, toybuf+(sizeof(toybuf)/2), sizeof(toybuf)/2);
39		if (len<0) {
40			perror_msg("%s",name);
41			toys.exitval = 1;
42		}
43		if (len<1) break;
44
45		for (in = out = 0; in < len; in++) {
46			char x = toybuf[in+sizeof(toybuf)/2];
47
48			// Drop \r only if followed by \n in dos2unix mode
49			if (catch) {
50				if (c == 'u' || x != '\n') toybuf[out++] = '\r';
51				catch = 0;
52			// Add \r only if \n not after \r in unix2dos mode
53			} else if (c == 'u' && x == '\n') toybuf[out++] = '\r';
54
55			if (x == '\r') catch++;
56			else toybuf[out++] = x;
57		}
58		xwrite(outfd, toybuf, out);
59	}
60	if (catch) xwrite(outfd, "\r", 1);
61
62	if (fd) replace_tempfile(-1, outfd, &TT.tempfile);
63}
64
65void dos2unix_main(void)
66{
67	loopfiles(toys.optargs, do_dos2unix);
68}
69