FreeBSD-5.3/usr.bin/uniq/uniq.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 const char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95";
#endif
static const char rcsid[] =
"$FreeBSD: src/usr.bin/uniq/uniq.c,v 1.25 2004/07/02 23:43:05 tjr Exp $";
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wchar.h>
#include <wctype.h>
#define MAXLINELEN (LINE_MAX + 1)
int cflag, dflag, uflag;
int numchars, numfields, repeats;
FILE *file(const char *, const char *);
wchar_t *getline(wchar_t *, size_t, FILE *);
void show(FILE *, wchar_t *);
wchar_t *skip(wchar_t *);
void obsolete(char *[]);
static void usage(void);
int wcsicoll(wchar_t *, wchar_t *);
int
main (int argc, char *argv[])
{
wchar_t *t1, *t2;
FILE *ifp, *ofp;
int ch;
wchar_t *prevline, *thisline;
char *p;
const char *ifn;
int iflag = 0, comp;
(void) setlocale(LC_ALL, "");
obsolete(argv);
while ((ch = getopt(argc, argv, "cdif:s:u")) != -1)
switch (ch) {
case 'c':
cflag = 1;
break;
case 'd':
dflag = 1;
break;
case 'i':
iflag = 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;
/* If no flags are set, default is -d -u. */
if (cflag) {
if (dflag || uflag)
usage();
} else if (!dflag && !uflag)
dflag = uflag = 1;
if (argc > 2)
usage();
ifp = stdin;
ifn = "stdin";
ofp = stdout;
if (argc > 0 && strcmp(argv[0], "-") != 0)
ifp = file(ifn = argv[0], "r");
if (argc > 1)
ofp = file(argv[1], "w");
prevline = malloc(MAXLINELEN * sizeof(*prevline));
thisline = malloc(MAXLINELEN * sizeof(*thisline));
if (prevline == NULL || thisline == NULL)
err(1, "malloc");
if (getline(prevline, MAXLINELEN, ifp) == NULL) {
if (ferror(ifp))
err(1, "%s", ifp == stdin ? "stdin" : argv[0]);
exit(0);
}
if (!cflag && uflag && dflag)
show(ofp, prevline);
while (getline(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 (iflag)
comp = wcsicoll(t1, t2);
else
comp = wcscoll(t1, t2);
if (comp) {
if (cflag || !dflag || !uflag)
show(ofp, prevline);
t1 = prevline;
prevline = thisline;
if (!cflag && uflag && dflag)
show(ofp, prevline);
thisline = t1;
repeats = 0;
} else
++repeats;
}
if (ferror(ifp))
err(1, "%s", ifp == stdin ? "stdin" : argv[0]);
if (cflag || !dflag || !uflag)
show(ofp, prevline);
exit(0);
}
wchar_t *
getline(wchar_t *buf, size_t buflen, FILE *fp)
{
size_t bufpos;
wint_t ch;
bufpos = 0;
while (bufpos + 2 != buflen && (ch = getwc(fp)) != WEOF && ch != '\n')
buf[bufpos++] = ch;
if (bufpos + 1 != buflen)
buf[bufpos] = '\0';
while (ch != WEOF && ch != '\n')
ch = getwc(fp);
return (bufpos != 0 || ch == '\n' ? buf : NULL);
}
/*
* show --
* Output a line depending on the flags and number of repetitions
* of the line.
*/
void
show(FILE *ofp, wchar_t *str)
{
if (cflag && *str)
(void)fprintf(ofp, "%4d %ls\n", repeats + 1, str);
if ((dflag && repeats) || (uflag && !repeats))
(void)fprintf(ofp, "%ls\n", str);
}
wchar_t *
skip(wchar_t *str)
{
int nchars, nfields;
for (nfields = 0; *str != '\0' && nfields++ != numfields; ) {
while (iswblank(*str))
str++;
while (*str != '\0' && !iswblank(*str))
str++;
}
for (nchars = numchars; nchars-- && *str; ++str);
return(str);
}
FILE *
file(const char *name, const char *mode)
{
FILE *fp;
if ((fp = fopen(name, mode)) == NULL)
err(1, "%s", name);
return(fp);
}
void
obsolete(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((unsigned char)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(1, "malloc");
*p++ = '-';
*p++ = ap[0] == '+' ? 's' : 'f';
(void)strcpy(p, ap + 1);
*argv = start;
}
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: uniq [-c | -d | -u] [-i] [-f fields] [-s chars] [input [output]]\n");
exit(1);
}
int
wcsicoll(wchar_t *s1, wchar_t *s2)
{
wchar_t *p, line1[MAXLINELEN], line2[MAXLINELEN];
for (p = line1; *s1; s1++)
*p++ = towlower(*s1);
*p = '\0';
for (p = line2; *s2; s2++)
*p++ = towlower(*s2);
*p = '\0';
return (wcscoll(line1, line2));
}