277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
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/* $NetBSD: vis.c,v 1.22 2013/02/20 17:04:45 christos Exp $ */
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/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)vis.c 8.1 (Berkeley) 6/6/93";
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#endif
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__RCSID("$NetBSD: vis.c,v 1.22 2013/02/20 17:04:45 christos Exp $");
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#endif /* not lint */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <wchar.h>
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#include <limits.h>
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#include <unistd.h>
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#include <err.h>
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#include <vis.h>
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#include "extern.h"
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static int eflags, fold, foldwidth = 80, none, markeol;
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#ifdef DEBUG
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int debug;
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#endif
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static const char *extra = "";
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static void process(FILE *);
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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int ch;
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int rval;
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while ((ch = getopt(argc, argv, "bcde:F:fhlmnostw")) != -1)
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switch((char)ch) {
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case 'b':
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eflags |= VIS_NOSLASH;
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break;
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case 'c':
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eflags |= VIS_CSTYLE;
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break;
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#ifdef DEBUG
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case 'd':
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debug++;
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break;
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#endif
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case 'e':
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extra = optarg;
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break;
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case 'F':
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if ((foldwidth = atoi(optarg)) < 5) {
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errx(1, "can't fold lines to less than 5 cols");
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/* NOTREACHED */
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}
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markeol++;
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break;
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case 'f':
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fold++; /* fold output lines to 80 cols */
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break; /* using hidden newline */
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case 'h':
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eflags |= VIS_HTTPSTYLE;
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break;
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case 'l':
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markeol++; /* mark end of line with \$ */
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break;
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case 'm':
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eflags |= VIS_MIMESTYLE;
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if (foldwidth == 80)
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foldwidth = 76;
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break;
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case 'n':
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none++;
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break;
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case 'o':
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eflags |= VIS_OCTAL;
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break;
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case 's':
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eflags |= VIS_SAFE;
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break;
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case 't':
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eflags |= VIS_TAB;
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break;
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case 'w':
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eflags |= VIS_WHITE;
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break;
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case '?':
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default:
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(void)fprintf(stderr,
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"Usage: %s [-bcfhlmnostw] [-e extra]"
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" [-F foldwidth] [file ...]\n", getprogname());
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return 1;
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}
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if ((eflags & (VIS_HTTPSTYLE|VIS_MIMESTYLE)) ==
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(VIS_HTTPSTYLE|VIS_MIMESTYLE))
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errx(1, "Can't specify -m and -h at the same time");
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argc -= optind;
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argv += optind;
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rval = 0;
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if (*argv)
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while (*argv) {
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if ((fp = fopen(*argv, "r")) != NULL) {
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process(fp);
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(void)fclose(fp);
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} else {
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warn("%s", *argv);
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rval = 1;
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}
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argv++;
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}
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else
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process(stdin);
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return rval;
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}
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static void
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process(FILE *fp)
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{
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static int col = 0;
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static char nul[] = "\0";
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char *cp = nul + 1; /* so *(cp-1) starts out != '\n' */
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wint_t c, c1, rachar;
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char mbibuff[2 * MB_LEN_MAX + 1]; /* max space for 2 wchars */
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char buff[4 * MB_LEN_MAX + 1]; /* max encoding length for one char */
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int mbilen, cerr = 0, raerr = 0;
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/*
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* The input stream is considered to be multibyte characters.
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* The input loop will read this data inputing one character,
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* possibly multiple bytes, at a time and converting each to
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* a wide character wchar_t.
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*
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* The vis(3) functions, however, require single either bytes
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* or a multibyte string as their arguments. So we convert
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* our input wchar_t and the following look-ahead wchar_t to
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* a multibyte string for processing by vis(3).
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*/
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/* Read one multibyte character, store as wchar_t */
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c = getwc(fp);
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if (c == WEOF && errno == EILSEQ) {
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/* Error in multibyte data. Read one byte. */
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c = (wint_t)getc(fp);
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cerr = 1;
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}
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while (c != WEOF) {
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/* Clear multibyte input buffer. */
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memset(mbibuff, 0, sizeof(mbibuff));
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/* Read-ahead next multibyte character. */
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if (!cerr)
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rachar = getwc(fp);
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if (cerr || (rachar == WEOF && errno == EILSEQ)) {
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/* Error in multibyte data. Read one byte. */
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rachar = (wint_t)getc(fp);
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raerr = 1;
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}
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if (none) {
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/* Handle -n flag. */
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cp = buff;
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*cp++ = c;
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if (c == '\\')
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*cp++ = '\\';
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*cp = '\0';
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} else if (markeol && c == '\n') {
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/* Handle -l flag. */
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cp = buff;
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if ((eflags & VIS_NOSLASH) == 0)
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*cp++ = '\\';
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*cp++ = '$';
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*cp++ = '\n';
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*cp = '\0';
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} else {
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/*
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* Convert character using vis(3) library.
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* At this point we will process one character.
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* But we must pass the vis(3) library this
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* character plus the next one because the next
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* one is used as a look-ahead to decide how to
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* encode this one under certain circumstances.
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*
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* Since our characters may be multibyte, e.g.,
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* in the UTF-8 locale, we cannot use vis() and
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* svis() which require byte input, so we must
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* create a multibyte string and use strvisx().
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*/
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/* Treat EOF as a NUL char. */
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c1 = rachar;
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if (c1 == WEOF)
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c1 = L'\0';
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/*
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* If we hit a multibyte conversion error above,
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* insert byte directly into string buff because
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* wctomb() will fail. Else convert wchar_t to
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* multibyte using wctomb().
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*/
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if (cerr) {
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*mbibuff = (char)c;
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mbilen = 1;
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} else
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mbilen = wctomb(mbibuff, c);
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/* Same for look-ahead character. */
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if (raerr)
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mbibuff[mbilen] = (char)c1;
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else
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wctomb(mbibuff + mbilen, c1);
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/* Perform encoding on just first character. */
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(void) strsenvisx(buff, 4 * MB_LEN_MAX, mbibuff,
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1, eflags, extra, &cerr);
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}
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cp = buff;
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if (fold) {
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#ifdef DEBUG
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if (debug)
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(void)printf("<%02d,", col);
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#endif
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col = foldit(cp, col, foldwidth, eflags);
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#ifdef DEBUG
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if (debug)
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(void)printf("%02d>", col);
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#endif
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}
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do {
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(void)putchar(*cp);
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} while (*++cp);
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c = rachar;
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cerr = raerr;
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}
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/*
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* terminate partial line with a hidden newline
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*/
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if (fold && *(cp - 1) != '\n')
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(void)printf(eflags & VIS_MIMESTYLE ? "=\n" : "\\\n");
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}
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