freebsd-dev/usr.bin/uniq/uniq.c
1997-03-29 04:34:07 +00:00

277 lines
6.1 KiB
C

/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95";
#endif /* not lint */
#include <errno.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAXLINELEN (8 * 1024)
int cflag, dflag, uflag;
int numchars, numfields, repeats;
void err __P((const char *, ...));
FILE *file __P((char *, char *));
void show __P((FILE *, char *));
char *skip __P((char *));
void obsolete __P((char *[]));
void usage __P((void));
int
main (argc, argv)
int argc;
char *argv[];
{
register char *t1, *t2;
FILE *ifp, *ofp;
int ch;
char *prevline, *thisline, *p;
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)
err("illegal field skip value: %s", optarg);
break;
case 's':
numchars = strtol(optarg, &p, 10);
if (numchars < 0 || *p)
err("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();
}
prevline = malloc(MAXLINELEN);
thisline = malloc(MAXLINELEN);
if (prevline == NULL || thisline == NULL)
err("%s", strerror(errno));
if (fgets(prevline, MAXLINELEN, ifp) == NULL)
exit(0);
while (fgets(thisline, MAXLINELEN, ifp)) {
/* 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)) {
show(ofp, prevline);
t1 = prevline;
prevline = thisline;
thisline = t1;
repeats = 0;
} else
++repeats;
}
show(ofp, prevline);
exit(0);
}
/*
* show --
* Output a line depending on the flags and number of repetitions
* of the line.
*/
void
show(ofp, str)
FILE *ofp;
char *str;
{
if (cflag && *str)
(void)fprintf(ofp, "%4d %s", repeats + 1, str);
if (dflag && repeats || uflag && !repeats)
(void)fprintf(ofp, "%s", str);
}
char *
skip(str)
register char *str;
{
register int infield, nchars, nfields;
for (nfields = numfields, infield = 0; nfields && *str; ++str)
if (isspace(*str)) {
if (infield) {
infield = 0;
--nfields;
}
} else if (!infield)
infield = 1;
for (nchars = numchars; nchars-- && *str; ++str);
return(str);
}
FILE *
file(name, mode)
char *name, *mode;
{
FILE *fp;
if ((fp = fopen(name, mode)) == NULL)
err("%s: %s", name, strerror(errno));
return(fp);
}
void
obsolete(argv)
char *argv[];
{
int 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(ap[1]))
continue;
/*
* Digit signifies an old-style option. Malloc space for dash,
* new option and argument.
*/
len = strlen(ap);
if ((start = p = malloc(len + 3)) == NULL)
err("%s", strerror(errno));
*p++ = '-';
*p++ = ap[0] == '+' ? 's' : 'f';
(void)strcpy(p, ap + 1);
*argv = start;
}
}
void
usage()
{
(void)fprintf(stderr,
"usage: uniq [-c | -du] [-f fields] [-s chars] [input [output]]\n");
exit(1);
}
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
void
#if __STDC__
err(const char *fmt, ...)
#else
err(fmt, va_alist)
char *fmt;
va_dcl
#endif
{
va_list ap;
#if __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void)fprintf(stderr, "uniq: ");
(void)vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, "\n");
exit(1);
/* NOTREACHED */
}