coreutils/dos2unix.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * dos2unix for BusyBox
   4  *
   5  * dos2unix '\n' converter 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 (5.5 kb)"
  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 (5.5 kb)"
  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         o = getopt32(argv, "^" "du" "\0" "u--d:d--u"); /* mutually exclusive */
 124
 125         /* Do the conversion requested by an argument else do the default
 126          * conversion depending on our name.  */
 127         if (o)
 128                 conv_type = o;
 129
 130         argv += optind;
 131         do {
 132                 /* might be convert(NULL) if there is no filename given */
 133                 convert(*argv, conv_type);
 134         } while (*argv && *++argv);
 135
 136         return 0;
 137 }