xref: /third_party/toybox/toys/posix/iconv.c (revision 0f66f451)
1/* iconv.c - Convert character encoding
2 *
3 * Copyright 2014 Felix Janda <felix.janda@posteo.de>
4 *
5 * See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/iconv.html
6 *
7 * Deviations from posix: no idea how to implement -l
8
9USE_ICONV(NEWTOY(iconv, "cst:f:", TOYFLAG_USR|TOYFLAG_BIN))
10
11config ICONV
12  bool "iconv"
13  default y
14  depends on TOYBOX_ICONV
15  help
16    usage: iconv [-f FROM] [-t TO] [FILE...]
17
18    Convert character encoding of files.
19
20    -c	Omit invalid chars
21    -f	Convert from (default UTF-8)
22    -t	Convert to   (default UTF-8)
23*/
24
25#define FOR_iconv
26#include "toys.h"
27#include <iconv.h>
28
29GLOBALS(
30  char *f, *t;
31
32  void *ic;
33)
34
35static void do_iconv(int fd, char *name)
36{
37  char *outstart = toybuf+2048;
38  size_t outlen, inlen = 0;
39  int readlen = 1;
40
41  for (;;) {
42    char *in = toybuf, *out = outstart;
43
44    if (readlen && 0>(readlen = read(fd, in+inlen, 2048-inlen))) {
45      perror_msg("read '%s'", name);
46      return;
47    }
48    inlen += readlen;
49    if (!inlen) break;
50
51    outlen = 2048;
52    iconv(TT.ic, &in, &inlen, &out, &outlen);
53    if (in == toybuf) {
54      // Skip first byte of illegal sequence to avoid endless loops
55      if (toys.optflags & FLAG_c) in++;
56      else *(out++) = *(in++);
57      inlen--;
58    }
59    if (out != outstart) xwrite(1, outstart, out-outstart);
60    memmove(toybuf, in, inlen);
61  }
62}
63
64void iconv_main(void)
65{
66  if (!TT.t) TT.t = "UTF-8";
67  if (!TT.f) TT.f = "UTF-8";
68
69  if ((iconv_t)-1 == (TT.ic = iconv_open(TT.t, TT.f)))
70    perror_exit("%s/%s", TT.t, TT.f);
71  loopfiles(toys.optargs, do_iconv);
72  if (CFG_TOYBOX_FREE) iconv_close(TT.ic);
73}
74