1/* dos2unix.c - convert newline format
2 *
3 * Copyright 2012 Rob Landley <rob@landley.net>
4
5USE_DOS2UNIX(NEWTOY(dos2unix, 0, TOYFLAG_BIN))
6USE_UNIX2DOS(NEWTOY(unix2dos, 0, TOYFLAG_BIN))
7
8config DOS2UNIX
9  bool "dos2unix/unix2dos"
10  default y
11  help
12    usage: dos2unix [FILE...]
13
14    Convert newline format from dos "\r\n" to unix "\n".
15    If no files listed copy from stdin, "-" is a synonym for stdin.
16
17config UNIX2DOS
18  bool "unix2dos"
19  default y
20  help
21    usage: unix2dos [FILE...]
22
23    Convert newline format from unix "\n" to dos "\r\n".
24    If no files listed copy from stdin, "-" is a synonym for stdin.
25*/
26
27#define FOR_dos2unix
28#include "toys.h"
29
30GLOBALS(
31  char *tempfile;
32)
33
34static void do_dos2unix(int fd, char *name)
35{
36  char c = toys.which->name[0];
37  int outfd = 1, catch = 0;
38
39  if (fd) outfd = copy_tempfile(fd, name, &TT.tempfile);
40
41  for (;;) {
42    int len, in, out;
43
44    len = read(fd, toybuf+(sizeof(toybuf)/2), sizeof(toybuf)/2);
45    if (len<0) perror_msg_raw(name);
46    if (len<1) break;
47
48    for (in = out = 0; in < len; in++) {
49      char x = toybuf[in+sizeof(toybuf)/2];
50
51      // Drop \r only if followed by \n in dos2unix mode
52      if (catch) {
53        if (c == 'u' || x != '\n') toybuf[out++] = '\r';
54        catch = 0;
55      // Add \r only if \n not after \r in unix2dos mode
56      } else if (c == 'u' && x == '\n') toybuf[out++] = '\r';
57
58      if (x == '\r') catch++;
59      else toybuf[out++] = x;
60    }
61    xwrite(outfd, toybuf, out);
62  }
63  if (catch) xwrite(outfd, "\r", 1);
64
65  if (fd) replace_tempfile(-1, outfd, &TT.tempfile);
66}
67
68void dos2unix_main(void)
69{
70  loopfiles(toys.optargs, do_dos2unix);
71}
72
73void unix2dos_main(void)
74{
75  dos2unix_main();
76}
77