release/src/router/busybox/coreutils/dos2unix.c

   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
  15 #include "libbb.h"
  16
  17 /* This is a NOEXEC applet. Be very careful! */
  18
  19 enum {
  20         CT_UNIX2DOS = 1,
  21         CT_DOS2UNIX
  22 };
  23
  24 /* if fn is NULL then input is stdin and output is stdout */
  25 static void convert(char *fn, int conv_type)
  26 {
  27         FILE *in, *out;
  28         int i;
  29         char *temp_fn = temp_fn; /* for compiler */
  30         char *resolved_fn = resolved_fn;
  31
  32         in = stdin;
  33         out = stdout;
  34         if (fn != NULL) {
  35                 struct stat st;
  36
  37                 resolved_fn = xmalloc_follow_symlinks(fn);
  38                 if (resolved_fn == NULL)
  39                         bb_simple_perror_msg_and_die(fn);
  40                 in = xfopen_for_read(resolved_fn);
  41                 fstat(fileno(in), &st);
  42
  43                 temp_fn = xasprintf("%sXXXXXX", resolved_fn);
  44                 i = xmkstemp(temp_fn);
  45                 if (fchmod(i, st.st_mode) == -1)
  46                         bb_simple_perror_msg_and_die(temp_fn);
  47
  48                 out = xfdopen_for_write(i);
  49         }
  50
  51         while ((i = fgetc(in)) != EOF) {
  52                 if (i == '\r')
  53                         continue;
  54                 if (i == '\n')
  55                         if (conv_type == CT_UNIX2DOS)
  56                                 fputc('\r', out);
  57                 fputc(i, out);
  58         }
  59
  60         if (fn != NULL) {
  61                 if (fclose(in) < 0 || fclose(out) < 0) {
  62                         unlink(temp_fn);
  63                         bb_perror_nomsg_and_die();
  64                 }
  65                 xrename(temp_fn, resolved_fn);
  66                 free(temp_fn);
  67                 free(resolved_fn);
  68         }
  69 }
  70
  71 int dos2unix_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  72 int dos2unix_main(int argc UNUSED_PARAM, char **argv)
  73 {
  74         int o, conv_type;
  75
  76         /* See if we are supposed to be doing dos2unix or unix2dos */
  77         conv_type = CT_UNIX2DOS;
  78         if (applet_name[0] == 'd') {
  79                 conv_type = CT_DOS2UNIX;
  80         }
  81
  82         /* -u convert to unix, -d convert to dos */
  83         opt_complementary = "u--d:d--u"; /* mutually exclusive */
  84         o = getopt32(argv, "du");
  85
  86         /* Do the conversion requested by an argument else do the default
  87          * conversion depending on our name.  */
  88         if (o)
  89                 conv_type = o;
  90
  91         argv += optind;
  92         do {
  93                 /* might be convert(NULL) if there is no filename given */
  94                 convert(*argv, conv_type);
  95         } while (*argv && *++argv);
  96
  97         return 0;
  98 }