NetBSD-5.0.2/usr.bin/uniq/uniq.c
/* $NetBSD: uniq.c,v 1.15 2008/07/21 14:19:27 lukem 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 1.15 2008/07/21 14:19:27 lukem 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 *);
static void obsolete(char *[]);
static void usage(void) __dead;
int
main (int argc, char *argv[])
{
const char *t1, *t2;
FILE *ifp, *ofp;
int ch;
char *prevline, *thisline, *p;
size_t prevlinesize, thislinesize, psize;
setprogname(argv[0]);
ifp = ofp = NULL;
obsolete(argv);
while ((ch = getopt(argc, argv, "-cdf:s:u")) != -1)
switch (ch) {
case '-':
--optind;
goto done;
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();
}
done: argc -= optind;
argv +=optind;
/* If no flags are set, default is -d -u. */
if (cflag) {
if (dflag || uflag)
usage();
} else if (!dflag && !uflag)
dflag = uflag = 1;
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 = psize;
if ((prevline = malloc(prevlinesize + 1)) == NULL)
err(1, "malloc");
(void)memcpy(prevline, p, prevlinesize);
prevline[prevlinesize] = '\0';
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;
}
(void)memcpy(thisline, p, psize);
thisline[psize] = '\0';
/* If requested get the chosen fields + character offsets. */
if (numfields || numchars) {
t1 = skip(thisline);
t2 = skip(prevline);
} else {
t1 = thisline;
t2 = prevline;
}
/* If different, print; set previous to new value. */
if (strcmp(t1, t2)) {
char *t;
size_t ts;
show(ofp, prevline);
t = prevline;
prevline = thisline;
thisline = t;
ts = prevlinesize;
prevlinesize = thislinesize;
thislinesize = ts;
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 (cflag && *str)
(void)fprintf(ofp, "%4d %s", repeats + 1, str);
if ((dflag && repeats) || (uflag && !repeats))
(void)fprintf(ofp, "%s", str);
}
static const char *
skip(const char *str)
{
int infield, nchars, nfields;
for (nfields = numfields, infield = 0; nfields && *str; ++str)
if (isspace((unsigned char)*str)) {
if (infield) {
infield = 0;
--nfields;
}
} else if (!infield)
infield = 1;
for (nchars = numchars; nchars-- && *str; ++str)
continue;
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 [-c | -du] [-f fields] [-s chars] "
"[input [output]]\n", getprogname());
exit(1);
}