File: [local] / src / usr.bin / uniq / uniq.c (download)
Revision 1.33, Sat Jan 1 18:20:52 2022 UTC (2 years, 5 months 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, OPENBSD_7_2_BASE, OPENBSD_7_2, OPENBSD_7_1_BASE, OPENBSD_7_1, HEAD Changes since 1.32: +9 -16 lines
uniq(1): miscellaneous style(9)-ish stuff
- Include what you use:
+ Add <strings.h> for strcasecmp(3).
+ Drop <errno.h>, unused.
- Pull the "errstr" declaration out of the getopt(3) loop
up to the top of main().
- Align the strtonum(3) error messages with the argument
names in the uniq.1 manpage and the usage string. They
are referred to as "chars" and "fields".
- Trim some whitespace.
- Return from main() instead of exit(3).
- De-(void) fprintf(3).
- Prefer getprogname(3) to __progname.
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/* $OpenBSD: uniq.c,v 1.33 2022/01/01 18:20:52 cheloha Exp $ */
/* $NetBSD: uniq.c,v 1.7 1995/08/31 22:03:48 jtc Exp $ */
/*
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Case Larsen.
*
* 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 <ctype.h>
#include <err.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
long long numchars, numfields;
unsigned long long repeats;
int cflag, dflag, iflag, uflag;
void show(const char *);
char *skip(char *);
void obsolete(char *[]);
__dead void usage(void);
int
main(int argc, char *argv[])
{
const char *errstr;
char *p, *prevline, *t, *thisline, *tmp;
size_t prevsize, thissize, tmpsize;
ssize_t len;
int ch;
setlocale(LC_CTYPE, "");
if (pledge("stdio rpath wpath cpath", NULL) == -1)
err(1, "pledge");
obsolete(argv);
while ((ch = getopt(argc, argv, "cdf:is:u")) != -1) {
switch (ch) {
case 'c':
cflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'f':
numfields = strtonum(optarg, 0, LLONG_MAX, &errstr);
if (errstr)
errx(1, "fields is %s: %s", errstr, optarg);
break;
case 'i':
iflag = 1;
break;
case 's':
numchars = strtonum(optarg, 0, LLONG_MAX, &errstr);
if (errstr)
errx(1, "chars is %s: %s", errstr, optarg);
break;
case 'u':
uflag = 1;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
/* If neither -d nor -u are set, default is -d -u. */
if (!dflag && !uflag)
dflag = uflag = 1;
if (argc > 2)
usage();
if (argc >= 1 && strcmp(argv[0], "-") != 0) {
if (freopen(argv[0], "r", stdin) == NULL)
err(1, "%s", argv[0]);
}
if (argc == 2 && strcmp(argv[1], "-") != 0) {
if (freopen(argv[1], "w", stdout) == NULL)
err(1, "%s", argv[1]);
}
if (pledge("stdio", NULL) == -1)
err(1, "pledge");
prevsize = 0;
prevline = NULL;
if ((len = getline(&prevline, &prevsize, stdin)) == -1) {
free(prevline);
if (ferror(stdin))
err(1, "getline");
return 0;
}
if (prevline[len - 1] == '\n')
prevline[len - 1] = '\0';
if (numfields || numchars)
p = skip(prevline);
else
p = prevline;
thissize = 0;
thisline = NULL;
while ((len = getline(&thisline, &thissize, stdin)) != -1) {
if (thisline[len - 1] == '\n')
thisline[len - 1] = '\0';
/* If requested get the chosen fields + character offsets. */
if (numfields || numchars)
t = skip(thisline);
else
t = thisline;
/* If different, print; set previous to new value. */
if ((iflag ? strcasecmp : strcmp)(p, t)) {
show(prevline);
tmp = prevline;
prevline = thisline;
thisline = tmp;
tmp = p;
p = t;
t = tmp;
tmpsize = prevsize;
prevsize = thissize;
thissize = tmpsize;
repeats = 0;
} else
++repeats;
}
free(thisline);
if (ferror(stdin))
err(1, "getline");
show(prevline);
free(prevline);
return 0;
}
/*
* show --
* Output a line depending on the flags and number of repetitions
* of the line.
*/
void
show(const char *str)
{
if ((dflag && repeats) || (uflag && !repeats)) {
if (cflag)
printf("%4llu %s\n", repeats + 1, str);
else
printf("%s\n", str);
}
}
char *
skip(char *str)
{
long long nchars, nfields;
wchar_t wc;
int len;
int field_started;
for (nfields = numfields; nfields && *str; nfields--) {
/* Skip one field, including preceding blanks. */
for (field_started = 0; *str != '\0'; str += len) {
if ((len = mbtowc(&wc, str, MB_CUR_MAX)) == -1) {
(void)mbtowc(NULL, NULL, MB_CUR_MAX);
wc = L'?';
len = 1;
}
if (iswblank(wc)) {
if (field_started)
break;
} else
field_started = 1;
}
}
/* Skip some additional characters. */
for (nchars = numchars; nchars-- && *str != '\0'; str += len)
if ((len = mblen(str, MB_CUR_MAX)) == -1)
len = 1;
return (str);
}
void
obsolete(char *argv[])
{
size_t len;
char *ap, *p, *start;
while ((ap = *++argv)) {
/* Return if "--" or not an option of any form. */
if (ap[0] != '-') {
if (ap[0] != '+')
return;
} else if (ap[1] == '-')
return;
if (!isdigit((unsigned char)ap[1]))
continue;
/*
* Digit signifies an old-style option. Malloc space for dash,
* new option and argument.
*/
len = strlen(ap) + 3;
if ((start = p = malloc(len)) == NULL)
err(1, "malloc");
*p++ = '-';
*p++ = ap[0] == '+' ? 's' : 'f';
(void)strlcpy(p, ap + 1, len - 2);
*argv = start;
}
}
__dead void
usage(void)
{
fprintf(stderr,
"usage: %s [-ci] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
getprogname());
exit(1);
}