unvis.c
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)unvis.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <stdio.h>
#include <vis.h>
char *Program;
#define usage() fprintf(stderr, "usage: %s %s\n", Program, USAGE)
#define USAGE "[file...]"
main(argc, argv)
char *argv[];
{
FILE *fp;
extern char *optarg;
extern int optind;
int ch;
Program = argv[0];
while ((ch = getopt(argc, argv, "")) != EOF)
switch((char)ch) {
case '?':
default:
usage();
exit(1);
}
argc -= optind;
argv += optind;
if (*argv)
while (*argv) {
if ((fp=fopen(*argv, "r")) != NULL)
process(fp, *argv);
else
syserror("%s", *argv);
argv++;
}
else
process(stdin, "<stdin>");
exit(0);
}
process(fp, filename)
FILE *fp;
char *filename;
{
register int offset = 0, c, ret;
int state = 0;
char outc;
while ((c = getc(fp)) != EOF) {
offset++;
again:
switch(ret = unvis(&outc, (char)c, &state, 0)) {
case UNVIS_VALID:
putchar(outc);
break;
case UNVIS_VALIDPUSH:
putchar(outc);
goto again;
case UNVIS_SYNBAD:
error("%s: offset: %d: can't decode", filename, offset);
state = 0;
break;
case 0:
case UNVIS_NOCHAR:
break;
default:
error("bad return value (%d), can't happen", ret);
exit(1);
}
}
if (unvis(&outc, (char)0, &state, UNVIS_END) == UNVIS_VALID)
putchar(outc);
}
#include <varargs.h>
error(va_alist)
va_dcl
{
char *fmt;
va_list ap;
extern errno;
fprintf(stderr, "%s: ", Program);
va_start(ap);
fmt = va_arg(ap, char *);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, "\n");
}
syserror(va_alist)
va_dcl
{
char *fmt;
va_list ap;
extern errno;
fprintf(stderr, "%s: ", Program);
va_start(ap);
fmt = va_arg(ap, char *);
(void) vfprintf(stderr, fmt, ap);
va_end(ap);
fprintf(stderr, ": %s\n", strerror(errno));
}