freebsd-dev/usr.bin/unexpand/unexpand.c
Tim J. Robbins 4596ce3d47 Some minor nits exposed by the Open Group's VSC Lite verification suite:
- When an error occurs processing one file, we must continue to process
  the remaining files.
- Convert trailing whitespace to tabs as appropriate.
- Align backspace handling with what the verification suite expects.

Reviewed by:	mike
2002-04-25 23:04:52 +00:00

221 lines
5.3 KiB
C

/*-
* Copyright (c) 1980, 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#ifndef lint
static const char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
#endif
/*
* unexpand - put tabs into a file replacing blanks
*/
#include <err.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int all;
int nstops;
int tabstops[100];
static void getstops(const char *);
static void usage(void);
static void tabify(void);
int
main(argc, argv)
int argc;
char *argv[];
{
int ch, failed;
char *filename;
nstops = 1;
tabstops[0] = 8;
while ((ch = getopt(argc, argv, "at:")) != -1) {
switch (ch) {
case 'a': /* Un-expand all spaces, not just leading. */
all = 1;
break;
case 't': /* Specify tab list, implies -a. */
getstops(optarg);
all = 1;
break;
default:
usage();
/*NOTREACHED*/
}
}
argc -= optind;
argv += optind;
failed = 0;
if (argc == 0)
tabify();
else {
while ((filename = *argv++) != NULL) {
if (freopen(filename, "r", stdin) == NULL) {
warn("%s", filename);
failed++;
} else
tabify();
}
}
exit(failed != 0);
}
static void
usage()
{
fprintf(stderr, "usage: unexpand [-a] [-t tablist] [file ...]\n");
exit(1);
}
static void
tabify()
{
int ch, dcol, doneline, limit, n, ocol;
limit = nstops == 1 ? INT_MAX : tabstops[nstops - 1] - 1;
doneline = ocol = dcol = 0;
while ((ch = getchar()) != EOF) {
if (ch == ' ' && !doneline) {
if (++dcol >= limit)
doneline = 1;
continue;
} else if (ch == '\t') {
if (nstops == 1) {
dcol = (1 + dcol / tabstops[0]) *
tabstops[0];
continue;
} else {
for (n = 0; tabstops[n] - 1 < dcol &&
n < nstops; n++)
;
if (n < nstops - 1 && tabstops[n] - 1 < limit) {
dcol = tabstops[n];
continue;
}
doneline = 1;
}
}
/* Output maximal number of tabs. */
if (nstops == 1) {
while (((ocol + tabstops[0]) / tabstops[0])
<= (dcol / tabstops[0])) {
if (dcol - ocol < 2)
break;
putchar('\t');
ocol = (1 + ocol / tabstops[0]) *
tabstops[0];
}
} else {
for (n = 0; tabstops[n] - 1 < ocol && n < nstops; n++)
;
while (ocol < dcol && n < nstops && ocol < limit) {
putchar('\t');
ocol = tabstops[n++];
}
}
/* Then spaces. */
while (ocol < dcol && ocol < limit) {
putchar(' ');
ocol++;
}
if (ch == '\b') {
putchar('\b');
if (ocol > 0)
ocol--, dcol--;
} else if (ch == '\n') {
putchar('\n');
doneline = ocol = dcol = 0;
} else if (ch != ' ' || dcol > limit) {
putchar(ch);
ocol++, dcol++;
}
/*
* Only processing leading blanks or we've gone past the
* last tab stop. Emit remainder of this line unchanged.
*/
if (!all || dcol >= limit) {
while ((ch = getchar()) != '\n' && ch != EOF)
putchar(ch);
if (ch == '\n')
putchar('\n');
doneline = ocol = dcol = 0;
}
}
}
static void
getstops(cp)
const char *cp;
{
int i;
nstops = 0;
for (;;) {
i = 0;
while (*cp >= '0' && *cp <= '9')
i = i * 10 + *cp++ - '0';
if (i <= 0)
errx(1, "bad tab stop spec");
if (nstops > 0 && i <= tabstops[nstops-1])
errx(1, "bad tab stop spec");
if (nstops == sizeof(tabstops) / sizeof(*tabstops))
errx(1, "too many tab stops");
tabstops[nstops++] = i;
if (*cp == 0)
break;
if (*cp != ',' && *cp != ' ')
errx(1, "bad tab stop spec");
cp++;
}
}