minix/usr.bin/unexpand/unexpand.c
Lionel Sambuc 3dab66925c Importing usr.bin/unexpand
Change-Id: I2bab349ebccc28b14db446689171bce7dede8a9d
2013-08-25 18:51:36 +02:00

218 lines
5.3 KiB
C

/* $NetBSD: unexpand.c,v 1.14 2008/12/21 02:33:13 christos Exp $ */
/*-
* 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. 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>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1980, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)unexpand.c 8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: unexpand.c,v 1.14 2008/12/21 02:33:13 christos Exp $");
#endif /* not lint */
/*
* unexpand - put tabs into a file replacing blanks
*/
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
#include <util.h>
#define DSTOP 8
static int all;
static size_t nstops;
static size_t maxstops;
static size_t *tabstops;
static void tabify(const char *, size_t);
static void usage(void) __attribute__((__noreturn__));
static void
usage(void)
{
(void)fprintf(stderr, "Usage: %s [-a] [-t tabstop] [file ...]\n",
getprogname());
exit(EXIT_FAILURE);
}
int
main(int argc, char **argv)
{
int c;
char *ep, *tab;
char *line;
size_t len;
unsigned long i;
setprogname(argv[0]);
while ((c = getopt(argc, argv, "at:")) != -1) {
switch (c) {
case 'a':
if (nstops)
usage();
all++;
break;
case 't':
if (all)
usage();
while ((tab = strsep(&optarg, ", \t")) != NULL) {
if (*tab == '\0')
continue;
errno = 0;
i = strtoul(tab, &ep, 0);
if (*ep || (errno == ERANGE && i == ULONG_MAX))
errx(EXIT_FAILURE,
"Invalid tabstop `%s'", tab);
if (nstops >= maxstops) {
maxstops += 20;
tabstops = erealloc(tabstops, maxstops);
}
if (nstops && tabstops[nstops - 1] >= (size_t)i)
errx(EXIT_FAILURE,
"Bad tabstop spec `%s', must be "
"greater than the previous `%zu'",
tab, tabstops[nstops - 1]);
tabstops[nstops++] = i;
}
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
for (i = 0; i < nstops; i++)
fprintf(stderr, "%lu %zu\n", i, tabstops[i]);
do {
if (argc > 0) {
if (freopen(argv[0], "r", stdin) == NULL)
err(EXIT_FAILURE, "Cannot open `%s'", argv[0]);
argc--, argv++;
}
while ((line = fgetln(stdin, &len)) != NULL)
tabify(line, len);
} while (argc > 0);
return EXIT_SUCCESS;
}
static void
tabify(const char *line, size_t len)
{
const char *e, *p;
size_t dcol, ocol, limit, n;
dcol = ocol = 0;
limit = nstops == 0 ? UINT_MAX : tabstops[nstops - 1] - 1;
e = line + len;
for (p = line; p < e; p++) {
if (*p == ' ') {
dcol++;
continue;
} else if (*p == '\t') {
if (nstops == 0) {
dcol = (1 + dcol / DSTOP) * DSTOP;
continue;
} else {
for (n = 0; tabstops[n] - 1 < dcol &&
n < nstops; n++)
continue;
if (n < nstops - 1 && tabstops[n] - 1 < limit) {
dcol = tabstops[n];
continue;
}
}
}
/* Output our tabs */
if (nstops == 0) {
while (((ocol + DSTOP) / DSTOP) <= (dcol / DSTOP)) {
if (dcol - ocol < 2)
break;
if (putchar('\t') == EOF)
goto out;
ocol = (1 + ocol / DSTOP) * DSTOP;
}
} else {
for (n = 0; tabstops[n] <= ocol && n < nstops; n++)
continue;
while (tabstops[n] <= dcol && ocol < dcol &&
n < nstops && ocol < limit) {
if (putchar('\t') == EOF)
goto out;
ocol = tabstops[n++];
}
}
/* Output remaining spaces */
while (ocol < dcol && ocol < limit) {
if (putchar(' ') == EOF)
goto out;
ocol++;
}
/* Output our char */
if (putchar(*p) == EOF)
goto out;
if (*p == '\b') {
if (ocol > 0) {
ocol--;
dcol--;
}
} else {
ocol++;
dcol++;
}
/* Output remainder of line */
if (!all || dcol >= limit) {
for (p++; p < e; p++)
if (putchar(*p) == EOF)
goto out;
return;
}
}
return;
out:
err(EXIT_FAILURE, "write failed");
}