File: [local] / src / usr.bin / uniq / uniq.c (download)
Revision 1.23, Mon Nov 2 20:25:42 2015 UTC (8 years, 7 months ago) by mmcc
Branch: MAIN
Changes since 1.22: +2 -2 lines
Cast isdigit()'s argument to an unsigned char.
ok millert@, jca@
|
/* $OpenBSD: uniq.c,v 1.23 2015/11/02 20:25:42 mmcc 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 <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MAXLINELEN (8 * 1024)
int cflag, dflag, uflag;
int numchars, numfields, repeats;
FILE *file(char *, char *);
void show(FILE *, char *);
char *skip(char *);
void obsolete(char *[]);
__dead void usage(void);
int
main(int argc, char *argv[])
{
char *t1, *t2;
FILE *ifp = NULL, *ofp = NULL;
int ch;
char *prevline, *thisline;
if (pledge("stdio rpath wpath cpath", NULL) == -1)
err(1, "pledge");
obsolete(argv);
while ((ch = getopt(argc, argv, "cdf:s:u")) != -1) {
const char *errstr;
switch (ch) {
case 'c':
cflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'f':
numfields = (int)strtonum(optarg, 0, INT_MAX,
&errstr);
if (errstr)
errx(1, "field skip value is %s: %s",
errstr, optarg);
break;
case 's':
numchars = (int)strtonum(optarg, 0, INT_MAX,
&errstr);
if (errstr)
errx(1,
"character skip value 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;
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 (pledge("stdio", NULL) == -1)
err(1, "pledge");
prevline = malloc(MAXLINELEN);
thisline = malloc(MAXLINELEN);
if (prevline == NULL || thisline == NULL)
err(1, "malloc");
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(FILE *ofp, char *str)
{
if ((dflag && repeats) || (uflag && !repeats)) {
if (cflag)
(void)fprintf(ofp, "%4d %s", repeats + 1, str);
else
(void)fprintf(ofp, "%s", str);
}
}
char *
skip(char *str)
{
int nchars, nfields;
for (nfields = numfields; nfields && *str; nfields--) {
while (isblank((unsigned char)*str))
str++;
while (*str && !isblank((unsigned char)*str))
str++;
}
for (nchars = numchars; nchars-- && *str && *str != '\n'; ++str)
;
return (str);
}
FILE *
file(char *name, char *mode)
{
FILE *fp;
if (strcmp(name, "-") == 0)
return(*mode == 'r' ? stdin : stdout);
if ((fp = fopen(name, mode)) == NULL)
err(1, "%s", name);
return (fp);
}
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)
{
extern char *__progname;
(void)fprintf(stderr,
"usage: %s [-c] [-d | -u] [-f fields] [-s chars] [input_file [output_file]]\n",
__progname);
exit(1);
}