File: [local] / src / usr.bin / colrm / colrm.c (download)
Revision 1.14, Sun Dec 4 23:50:47 2022 UTC (17 months, 2 weeks ago) by cheloha
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, HEAD Changes since 1.13: +1 -2 lines
userspace: remove vestigial '?' cases from top-level getopt(3) loops
getopt(3) returns '?' when it encounters a flag not present in the in
the optstring or if a flag is missing its option argument. We can
handle this case with the "default" failure case with no loss of
legibility. Hence, remove all the redundant "case '?':" lines.
Prompted by dlg@. With help from dlg@ and millert@.
Link: https://marc.info/?l=openbsd-tech&m=167011979726449&w=2
ok naddy@ millert@ dlg@
|
/* $OpenBSD: colrm.c,v 1.14 2022/12/04 23:50:47 cheloha Exp $ */
/* $NetBSD: colrm.c,v 1.4 1995/09/02 05:51:37 jtc Exp $ */
/*-
* Copyright (c) 1991, 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/types.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#define TAB 8
void usage(void);
int
main(int argc, char *argv[])
{
char *line, *p;
ssize_t linesz;
wchar_t wc;
u_long column, newcol, start, stop;
int ch, len, width;
setlocale(LC_CTYPE, "");
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
while ((ch = getopt(argc, argv, "")) != -1)
switch(ch) {
default:
usage();
}
argc -= optind;
argv += optind;
start = stop = 0;
switch(argc) {
case 2:
stop = strtol(argv[1], &p, 10);
if (stop <= 0 || *p)
errx(1, "illegal column -- %s", argv[1]);
/* FALLTHROUGH */
case 1:
start = strtol(argv[0], &p, 10);
if (start <= 0 || *p)
errx(1, "illegal column -- %s", argv[0]);
break;
case 0:
break;
default:
usage();
}
if (stop && start > stop)
err(1, "illegal start and stop columns");
line = NULL;
while (getline(&line, &linesz, stdin) != -1) {
column = 0;
width = 0;
for (p = line; *p != '\0'; p += len) {
len = 1;
switch (*p) {
case '\n':
putchar('\n');
continue;
case '\b':
/*
* Pass it through if the previous character
* was in scope, still represented by the
* current value of "column".
* Allow an optional second backspace
* after a double-width character.
*/
if (start == 0 || column < start ||
(stop > 0 &&
column > stop + (width > 1))) {
putchar('\b');
if (width > 1 && p[1] == '\b')
putchar('\b');
}
if (width > 1 && p[1] == '\b')
p++;
column -= width;
continue;
case '\t':
newcol = (column + TAB) & ~(TAB - 1);
if (start == 0 || newcol < start) {
putchar('\t');
column = newcol;
} else
/*
* Expand tabs that intersect or
* follow deleted columns.
*/
while (column < newcol)
if (++column < start ||
(stop > 0 &&
column > stop))
putchar(' ');
continue;
default:
break;
}
/*
* Handle the three cases of invalid bytes,
* non-printable, and printable characters.
*/
if ((len = mbtowc(&wc, p, MB_CUR_MAX)) == -1) {
(void)mbtowc(NULL, NULL, MB_CUR_MAX);
len = 1;
width = 1;
} else if ((width = wcwidth(wc)) == -1)
width = 1;
/*
* If the character completely fits before or
* after the cut, keep it; otherwise, skip it.
*/
if ((start == 0 || column + width < start ||
(stop > 0 && column + (width > 0) > stop)))
fwrite(p, 1, len, stdout);
/*
* If the cut cuts the character in half
* and no backspace follows,
* print a blank for correct columnation.
*/
else if (width > 1 && p[len] != '\b' &&
(start == 0 || column + 1 < start ||
(stop > 0 && column + width > stop)))
putchar(' ');
column += width;
}
}
if (ferror(stdin))
err(1, "stdin");
if (ferror(stdout))
err(1, "stdout");
return 0;
}
void
usage(void)
{
(void)fprintf(stderr, "usage: colrm [start [stop]]\n");
exit(1);
}