text-utils/colcrt.c

   1 /*
   2  * Copyright (C) 2016 Sami Kerola <kerolasa@iki.fi>
   3  * Copyright (C) 2016 Karel Zak <kzak@redhat.com>
   4  *
   5  * Copyright (c) 1980, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 /*
  38  * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
  39  *      added Native Language Support
  40  * 1999-09-19 Bruno Haible <haible@clisp.cons.org>
  41  *      modified to work correctly in multi-byte locales
  42  */
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <getopt.h>
  47
  48 #include "nls.h"
  49 #include "c.h"
  50 #include "widechar.h"
  51 #include "closestream.h"
  52
  53 /*
  54  * colcrt - replaces col for crts with new nroff esp. when using tbl.
  55  * Bill Joy UCB July 14, 1977
  56  *
  57  * This filter uses the up and down sequences generated by the new
  58  * nroff when used with tbl and by \u \d and \r.
  59  * General overstriking doesn't work correctly.
  60  * Underlining is split onto multiple lines, etc.
  61  *
  62  * Option - suppresses all underlining.
  63  * Option -2 forces printing of all half lines.
  64  */
  65
  66 enum { OUTPUT_COLS = 132 };
  67
  68 struct colcrt_control {
  69         FILE            *f;
  70         wchar_t         line[OUTPUT_COLS + 1];
  71         wchar_t         line_under[OUTPUT_COLS + 1];
  72         unsigned int    print_nl:1,
  73                         need_line_under:1,
  74                         no_underlining:1,
  75                         half_lines:1;
  76 };
  77
  78 static void __attribute__((__noreturn__)) usage(void)
  79 {
  80         FILE *out = stdout;
  81         fputs(USAGE_HEADER, out);
  82         fprintf(out, _(" %s [options] [<file>...]\n"), program_invocation_short_name);
  83
  84         fputs(USAGE_SEPARATOR, out);
  85         fputs(_("Filter nroff output for CRT previewing.\n"), out);
  86
  87         fputs(USAGE_OPTIONS, out);
  88         fputs(_(" -,  --no-underlining    suppress all underlining\n"), out);
  89         fputs(_(" -2, --half-lines        print all half-lines\n"), out);
  90
  91         fputs(USAGE_SEPARATOR, out);
  92         printf(USAGE_HELP_OPTIONS(25));
  93
  94         printf(USAGE_MAN_TAIL("colcrt(1)"));
  95
  96         exit(EXIT_SUCCESS);
  97 }
  98
  99 static void trim_trailing_spaces(wchar_t *s)
 100 {
 101         size_t size;
 102         wchar_t *end;
 103
 104         size = wcslen(s);
 105         if (!size)
 106                 return;
 107         end = s + size - 1;
 108         while (s <= end && iswspace(*end))
 109                 end--;
 110         *(end + 1) = L'\0';
 111 }
 112
 113
 114 static void output_lines(struct colcrt_control *ctl, int col)
 115 {
 116         /* first line */
 117         trim_trailing_spaces(ctl->line);
 118         fputws(ctl->line, stdout);
 119
 120         if (ctl->print_nl)
 121                 fputwc(L'\n', stdout);
 122         if (!ctl->half_lines && !ctl->no_underlining)
 123                 ctl->print_nl = 0;
 124
 125         wmemset(ctl->line, L'\0', OUTPUT_COLS);
 126
 127         /* second line */
 128         if (ctl->need_line_under) {
 129                 ctl->need_line_under = 0;
 130                 ctl->line_under[col] = L'\0';
 131                 trim_trailing_spaces(ctl->line_under);
 132                 fputws(ctl->line_under, stdout);
 133                 fputwc(L'\n', stdout);
 134                 wmemset(ctl->line_under, L' ', OUTPUT_COLS);
 135
 136         } else if (ctl->half_lines && 0 < col)
 137                 fputwc(L'\n', stdout);
 138 }
 139
 140 static int rubchars(struct colcrt_control *ctl, int col, int n)
 141 {
 142         while (0 < n && 0 < col) {
 143                 ctl->line[col] = L'\0';
 144                 ctl->line_under[col] = L' ';
 145                 n--;
 146                 col--;
 147         }
 148         return col;
 149 }
 150
 151 static void colcrt(struct colcrt_control *ctl)
 152 {
 153         int col;
 154         wint_t c = 0;
 155         long old_pos;
 156
 157         ctl->print_nl = 1;
 158         if (ctl->half_lines)
 159                 fputwc(L'\n', stdout);
 160
 161         for (col = 0; /* nothing */; col++) {
 162                 if (OUTPUT_COLS - 1 < col) {
 163                         output_lines(ctl, col);
 164                         errno = 0;
 165                         old_pos = ftell(ctl->f);
 166
 167                         while (getwc(ctl->f) != L'\n') {
 168                                 long new_pos;
 169
 170                                 if (ferror(ctl->f) || feof(ctl->f))
 171                                         return;
 172                                 new_pos = ftell(ctl->f);
 173                                 if (old_pos == new_pos) {
 174                                         if (fseek(ctl->f, 1, SEEK_CUR) < 1)
 175                                                 return;
 176                                 } else
 177                                         old_pos = new_pos;
 178                         }
 179                         col = -1;
 180                         continue;
 181                 }
 182                 c = getwc(ctl->f);
 183                 switch (c) {
 184                 case 033:       /* ESC */
 185                         c = getwc(ctl->f);
 186                         if (c == L'8') {
 187                                 col = rubchars(ctl, col, 1);
 188                                 continue;
 189                         }
 190                         if (c == L'7') {
 191                                 col = rubchars(ctl, col, 2);
 192                                 continue;
 193                         }
 194                         continue;
 195                 case WEOF:
 196                         ctl->print_nl = 0;
 197                         output_lines(ctl, col);
 198                         return;
 199                 case L'\n':
 200                         output_lines(ctl, col);
 201                         col = -1;
 202                         continue;
 203                 case L'\t':
 204                         for (/* nothing */; col % 8 && col < OUTPUT_COLS; col++) {
 205                                 ctl->line[col] = L' ';
 206                         }
 207                         col--;
 208                         continue;
 209                 case L'_':
 210                         ctl->line[col] = L' ';
 211                         if (!ctl->no_underlining) {
 212                                 ctl->need_line_under = 1;
 213                                 ctl->line_under[col] = L'-';
 214                         }
 215                         continue;
 216                 default:
 217                         if (!iswprint(c)) {
 218                                 col--;
 219                                 continue;
 220                         }
 221                         ctl->print_nl = 1;
 222                         ctl->line[col] = c;
 223                 }
 224         }
 225 }
 226
 227 int main(int argc, char **argv)
 228 {
 229         struct colcrt_control ctl = { NULL };
 230         int opt;
 231         enum { NO_UL_OPTION = CHAR_MAX + 1 };
 232
 233         static const struct option longopts[] = {
 234                 {"no-underlining", no_argument, NULL, NO_UL_OPTION},
 235                 {"half-lines", no_argument, NULL, '2'},
 236                 {"version", no_argument, NULL, 'V'},
 237                 {"help", no_argument, NULL, 'h'},
 238                 {NULL, 0, NULL, 0}
 239         };
 240
 241         setlocale(LC_ALL, "");
 242         bindtextdomain(PACKAGE, LOCALEDIR);
 243         textdomain(PACKAGE);
 244         close_stdout_atexit();
 245
 246         /* Take care of lonely hyphen option. */
 247         for (opt = 0; opt < argc; opt++) {
 248                 if (argv[opt][0] == '-' && argv[opt][1] == '\0') {
 249                         ctl.no_underlining = 1;
 250                         argc--;
 251                         memmove(argv + opt, argv + opt + 1,
 252                                 sizeof(char *) * (argc - opt));
 253                         opt--;
 254                 }
 255         }
 256
 257         while ((opt = getopt_long(argc, argv, "2Vh", longopts, NULL)) != -1) {
 258                 switch (opt) {
 259                 case NO_UL_OPTION:
 260                         ctl.no_underlining = 1;
 261                         break;
 262                 case '2':
 263                         ctl.half_lines = 1;
 264                         break;
 265
 266                 case 'V':
 267                         print_version(EXIT_SUCCESS);
 268                 case 'h':
 269                         usage();
 270                 default:
 271                         errtryhelp(EXIT_FAILURE);
 272                 }
 273         }
 274
 275         argc -= optind;
 276         argv += optind;
 277
 278         do {
 279                 wmemset(ctl.line, L'\0', OUTPUT_COLS);
 280                 wmemset(ctl.line_under, L' ', OUTPUT_COLS);
 281
 282                 if (argc > 0) {
 283                         if (!(ctl.f = fopen(*argv, "r")))
 284                                 err(EXIT_FAILURE, _("cannot open %s"), *argv);
 285                         argc--;
 286                         argv++;
 287                 } else
 288                         ctl.f = stdin;
 289
 290                 colcrt(&ctl);
 291                 if (ctl.f != stdin)
 292                         fclose(ctl.f);
 293         } while (argc > 0);
 294
 295         return EXIT_SUCCESS;
 296 }