264 lines
6.3 KiB
C
264 lines
6.3 KiB
C
/* $NetBSD: uniq.c,v 1.22 2019/04/23 17:35:10 christos 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 <sys/cdefs.h>
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
|
|
The Regents of the University of California. All rights reserved.");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95";
|
|
#endif
|
|
__RCSID("$NetBSD: uniq.c,v 1.22 2019/04/23 17:35:10 christos Exp $");
|
|
#endif /* not lint */
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
static int cflag, dflag, uflag;
|
|
static int numchars, numfields, repeats;
|
|
|
|
static FILE *file(const char *, const char *);
|
|
static void show(FILE *, const char *);
|
|
static const char *skip(const char *, size_t *);
|
|
static void obsolete(char *[]);
|
|
static void usage(void) __dead;
|
|
|
|
int
|
|
main (int argc, char *argv[])
|
|
{
|
|
const char *prevp, *thisp;
|
|
FILE *ifp, *ofp;
|
|
int ch;
|
|
char *prevline, *thisline, *p;
|
|
size_t prevlinesize, thislinesize, psize;
|
|
size_t prevlen, thislen;
|
|
|
|
setprogname(argv[0]);
|
|
ifp = ofp = NULL;
|
|
obsolete(argv);
|
|
while ((ch = getopt(argc, argv, "cdf:s:u")) != -1)
|
|
switch (ch) {
|
|
case 'c':
|
|
cflag = 1;
|
|
break;
|
|
case 'd':
|
|
dflag = 1;
|
|
break;
|
|
case 'f':
|
|
numfields = strtol(optarg, &p, 10);
|
|
if (numfields < 0 || *p)
|
|
errx(1, "illegal field skip value: %s", optarg);
|
|
break;
|
|
case 's':
|
|
numchars = strtol(optarg, &p, 10);
|
|
if (numchars < 0 || *p)
|
|
errx(1, "illegal character skip value: %s",
|
|
optarg);
|
|
break;
|
|
case 'u':
|
|
uflag = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
argc -= optind;
|
|
argv +=optind;
|
|
|
|
switch(argc) {
|
|
case 0:
|
|
ifp = stdin;
|
|
ofp = stdout;
|
|
break;
|
|
case 1:
|
|
ifp = file(argv[0], "r");
|
|
ofp = stdout;
|
|
break;
|
|
case 2:
|
|
ifp = file(argv[0], "r");
|
|
ofp = file(argv[1], "w");
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
if ((p = fgetln(ifp, &psize)) == NULL)
|
|
return 0;
|
|
prevlinesize = prevlen = psize;
|
|
if ((prevline = malloc(prevlinesize + 1)) == NULL)
|
|
err(1, "malloc");
|
|
(void)memcpy(prevline, p, prevlinesize);
|
|
prevline[prevlinesize] = '\0';
|
|
|
|
if (numfields || numchars)
|
|
prevp = skip(prevline, &prevlen);
|
|
else
|
|
prevp = prevline;
|
|
|
|
thislinesize = psize;
|
|
if ((thisline = malloc(thislinesize + 1)) == NULL)
|
|
err(1, "malloc");
|
|
|
|
while ((p = fgetln(ifp, &psize)) != NULL) {
|
|
if (psize > thislinesize) {
|
|
if ((thisline = realloc(thisline, psize + 1)) == NULL)
|
|
err(1, "realloc");
|
|
thislinesize = psize;
|
|
}
|
|
thislen = psize;
|
|
(void)memcpy(thisline, p, psize);
|
|
thisline[psize] = '\0';
|
|
|
|
/* If requested get the chosen fields + character offsets. */
|
|
if (numfields || numchars) {
|
|
thisp = skip(thisline, &thislen);
|
|
} else {
|
|
thisp = thisline;
|
|
}
|
|
|
|
/* If different, print; set previous to new value. */
|
|
if (thislen != prevlen || strcmp(thisp, prevp)) {
|
|
char *t;
|
|
size_t ts;
|
|
|
|
show(ofp, prevline);
|
|
t = prevline;
|
|
prevline = thisline;
|
|
thisline = t;
|
|
ts = prevlinesize;
|
|
prevlinesize = thislinesize;
|
|
thislinesize = ts;
|
|
prevp = thisp;
|
|
prevlen = thislen;
|
|
repeats = 0;
|
|
} else
|
|
++repeats;
|
|
}
|
|
show(ofp, prevline);
|
|
free(prevline);
|
|
free(thisline);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* show --
|
|
* Output a line depending on the flags and number of repetitions
|
|
* of the line.
|
|
*/
|
|
static void
|
|
show(FILE *ofp, const char *str)
|
|
{
|
|
|
|
if ((dflag && repeats == 0) || (uflag && repeats > 0))
|
|
return;
|
|
if (cflag) {
|
|
(void)fprintf(ofp, "%4d %s", repeats + 1, str);
|
|
} else {
|
|
(void)fprintf(ofp, "%s", str);
|
|
}
|
|
}
|
|
|
|
static const char *
|
|
skip(const char *str, size_t *linesize)
|
|
{
|
|
int infield, nchars, nfields;
|
|
size_t ls = *linesize;
|
|
|
|
for (nfields = numfields, infield = 0; nfields && *str; ++str, --ls)
|
|
if (isspace((unsigned char)*str)) {
|
|
if (infield) {
|
|
infield = 0;
|
|
--nfields;
|
|
}
|
|
} else if (!infield)
|
|
infield = 1;
|
|
for (nchars = numchars; nchars-- && *str; ++str, --ls)
|
|
continue;
|
|
*linesize = ls;
|
|
return str;
|
|
}
|
|
|
|
static FILE *
|
|
file(const char *name, const char *mode)
|
|
{
|
|
FILE *fp;
|
|
|
|
if ((fp = fopen(name, mode)) == NULL)
|
|
err(1, "%s", name);
|
|
return(fp);
|
|
}
|
|
|
|
static void
|
|
obsolete(char *argv[])
|
|
{
|
|
char *ap, *p, *start;
|
|
|
|
while ((ap = *++argv) != NULL) {
|
|
/* 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.
|
|
*/
|
|
(void)asprintf(&p, "-%c%s", ap[0] == '+' ? 's' : 'f', ap + 1);
|
|
if (!p)
|
|
err(1, "malloc");
|
|
start = p;
|
|
*argv = start;
|
|
}
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr, "usage: %s [-cdu] [-f fields] [-s chars] "
|
|
"[input_file [output_file]]\n", getprogname());
|
|
exit(1);
|
|
}
|