usr.bin/iconv/iconv.c

   1 /* $NetBSD: iconv.c,v 1.16 2009/02/20 15:28:21 yamt Exp $ */
   2
   3 /*-
   4  * SPDX-License-Identifier: BSD-2-Clause
   5  *
   6  * Copyright (c)2003 Citrus Project,
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 #include <sys/capsicum.h>
  33
  34 #include <capsicum_helpers.h>
  35 #include <err.h>
  36 #include <errno.h>
  37 #include <getopt.h>
  38 #include <iconv.h>
  39 #include <limits.h>
  40 #include <locale.h>
  41 #include <stdbool.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 static int              do_conv(FILE *, iconv_t, bool, bool);
  48 static int              do_list(unsigned int, const char * const *, void *);
  49 static void             usage(void) __dead2;
  50
  51 static const struct option long_options[] = {
  52         {"from-code",           required_argument,      NULL, 'f'},
  53         {"list",                no_argument,            NULL, 'l'},
  54         {"silent",              no_argument,            NULL, 's'},
  55         {"to-code",             required_argument,      NULL, 't'},
  56         {NULL,                  no_argument,            NULL, 0}
  57 };
  58
  59 static void
  60 usage(void)
  61 {
  62         (void)fprintf(stderr,
  63             "Usage:\t%1$s [-cs] -f <from_code> -t <to_code> [file ...]\n"
  64             "\t%1$s -f <from_code> [-cs] [-t <to_code>] [file ...]\n"
  65             "\t%1$s -t <to_code> [-cs] [-f <from_code>] [file ...]\n"
  66             "\t%1$s -l\n", getprogname());
  67         exit(1);
  68 }
  69
  70 #define INBUFSIZE 1024
  71 #define OUTBUFSIZE (INBUFSIZE * 2)
  72 static int
  73 do_conv(FILE *fp, iconv_t cd, bool silent, bool hide_invalid)
  74 {
  75         char inbuf[INBUFSIZE], outbuf[OUTBUFSIZE], *in, *out;
  76         unsigned long long invalids;
  77         size_t inbytes, outbytes, ret;
  78
  79         /*
  80          * Don't touch ICONV_SET_DISCARD_ILSEQ if -c wasn't specified.  It may
  81          * be that the user has specified //IGNORE in the -t specification, and
  82          * we don't want to clobber that.
  83          */
  84         if (hide_invalid) {
  85                 int arg = (int)hide_invalid;
  86                 if (iconvctl(cd, ICONV_SET_DISCARD_ILSEQ, (void *)&arg) == -1)
  87                         err(EXIT_FAILURE, "iconvctl(DISCARD_ILSEQ, %d)", arg);
  88         }
  89
  90         invalids = 0;
  91         while ((inbytes = fread(inbuf, 1, INBUFSIZE, fp)) > 0) {
  92                 in = inbuf;
  93                 while (inbytes > 0) {
  94                         size_t inval;
  95
  96                         out = outbuf;
  97                         outbytes = OUTBUFSIZE;
  98                         ret = __iconv(cd, &in, &inbytes, &out, &outbytes,
  99                             0, &inval);
 100                         invalids += inval;
 101                         if (outbytes < OUTBUFSIZE)
 102                                 (void)fwrite(outbuf, 1, OUTBUFSIZE - outbytes,
 103                                     stdout);
 104                         if (ret == (size_t)-1 && errno != E2BIG) {
 105                                 if (errno != EINVAL || in == inbuf)
 106                                         err(EXIT_FAILURE, "iconv()");
 107
 108                                 /* incomplete input character */
 109                                 (void)memmove(inbuf, in, inbytes);
 110                                 ret = fread(inbuf + inbytes, 1,
 111                                     INBUFSIZE - inbytes, fp);
 112                                 if (ret == 0) {
 113                                         fflush(stdout);
 114                                         if (feof(fp))
 115                                                 errx(EXIT_FAILURE,
 116                                                     "unexpected end of file; "
 117                                                     "the last character is "
 118                                                     "incomplete.");
 119                                         else
 120                                                 err(EXIT_FAILURE, "fread()");
 121                                 }
 122                                 in = inbuf;
 123                                 inbytes += ret;
 124                         }
 125                 }
 126         }
 127         /* reset the shift state of the output buffer */
 128         outbytes = OUTBUFSIZE;
 129         out = outbuf;
 130         ret = iconv(cd, NULL, NULL, &out, &outbytes);
 131         if (ret == (size_t)-1)
 132                 err(EXIT_FAILURE, "iconv()");
 133         if (outbytes < OUTBUFSIZE)
 134                 (void)fwrite(outbuf, 1, OUTBUFSIZE - outbytes, stdout);
 135
 136         if (invalids > 0 && !silent)
 137                 warnx("warning: invalid characters: %llu", invalids);
 138
 139         return (invalids > 0);
 140 }
 141
 142 static int
 143 do_list(unsigned int n, const char * const *list, void *data __unused)
 144 {
 145         unsigned int i;
 146
 147         for(i = 0; i < n; i++) {
 148                 printf("%s", list[i]);
 149                 if (i < n - 1)
 150                         printf(" ");
 151         }
 152         printf("\n");
 153
 154         return (1);
 155 }
 156
 157 int
 158 main(int argc, char **argv)
 159 {
 160         iconv_t cd;
 161         FILE *fp;
 162         const char *opt_f, *opt_t;
 163         int ch, i, res;
 164         bool opt_c = false, opt_s = false;
 165
 166         opt_f = opt_t = "";
 167
 168         setlocale(LC_ALL, "");
 169         setprogname(argv[0]);
 170
 171         while ((ch = getopt_long(argc, argv, "csLlf:t:",
 172             long_options, NULL)) != -1) {
 173                 switch (ch) {
 174                 case 'c':
 175                         opt_c = true;
 176                         break;
 177                 case 's':
 178                         opt_s = true;
 179                         break;
 180                 case 'l':
 181                         /* list */
 182                         if (opt_s || opt_c || strcmp(opt_f, "") != 0 ||
 183                             strcmp(opt_t, "") != 0) {
 184                                 warnx("-l is not allowed with other flags.");
 185                                 usage();
 186                         }
 187                         iconvlist(do_list, NULL);
 188                         return (EXIT_SUCCESS);
 189                 case 'f':
 190                         /* from */
 191                         if (optarg != NULL)
 192                                 opt_f = optarg;
 193                         break;
 194                 case 't':
 195                         /* to */
 196                         if (optarg != NULL)
 197                                 opt_t = optarg;
 198                         break;
 199                 default:
 200                         usage();
 201                 }
 202         }
 203         argc -= optind;
 204         argv += optind;
 205         if ((strcmp(opt_f, "") == 0) && (strcmp(opt_t, "") == 0))
 206                 usage();
 207
 208         if (caph_limit_stdio() < 0)
 209                 err(EXIT_FAILURE, "capsicum");
 210
 211         /*
 212          * Cache NLS data, for strerror, for err(3), before entering capability
 213          * mode.
 214          */
 215         caph_cache_catpages();
 216
 217         /*
 218          * Cache iconv conversion handle before entering sandbox.
 219          */
 220         cd = iconv_open(opt_t, opt_f);
 221         if (cd == (iconv_t)-1)
 222                 err(EXIT_FAILURE, "iconv_open(%s, %s)", opt_t, opt_f);
 223
 224         if (argc == 0) {
 225                 if (caph_enter() < 0)
 226                         err(EXIT_FAILURE, "unable to enter capability mode");
 227                 res = do_conv(stdin, cd, opt_s, opt_c);
 228         } else {
 229                 res = 0;
 230                 for (i = 0; i < argc; i++) {
 231                         fp = (strcmp(argv[i], "-") != 0) ?
 232                             fopen(argv[i], "r") : stdin;
 233                         if (fp == NULL)
 234                                 err(EXIT_FAILURE, "Cannot open `%s'",
 235                                     argv[i]);
 236                         /* Enter Capsicum sandbox for final input file. */
 237                         if (i + 1 == argc && caph_enter() < 0)
 238                                 err(EXIT_FAILURE,
 239                                     "unable to enter capability mode");
 240                         res |= do_conv(fp, cd, opt_s, opt_c);
 241                         (void)fclose(fp);
 242
 243                         /* Reset iconv descriptor state. */
 244                         (void)iconv(cd, NULL, NULL, NULL, NULL);
 245                 }
 246         }
 247         iconv_close(cd);
 248         return (res == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
 249 }