77df47bda0
The lengths of the lines being compared were not correct. Essentially, we were comparing the length of the buffers instead of the length of the strings. This patch also avoids calling skip() twice for the same line. Thanks to Rin Okuyama for the patch.
267 lines
6.3 KiB
C
267 lines
6.3 KiB
C
/* $NetBSD: uniq.c,v 1.20 2016/10/16 06:17:51 abhinav Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Case Larsen.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)uniq.c 8.3 (Berkeley) 5/4/95";
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#endif
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__RCSID("$NetBSD: uniq.c,v 1.20 2016/10/16 06:17:51 abhinav Exp $");
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#endif /* not lint */
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static int cflag, dflag, uflag;
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static int numchars, numfields, repeats;
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static FILE *file(const char *, const char *);
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static void show(FILE *, const char *);
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static const char *skip(const char *, size_t *);
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static void obsolete(char *[]);
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static void usage(void) __dead;
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int
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main (int argc, char *argv[])
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{
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const char *prevp, *thisp;
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FILE *ifp, *ofp;
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int ch;
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char *prevline, *thisline, *p;
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size_t prevlinesize, thislinesize, psize;
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size_t prevlen, thislen;
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setprogname(argv[0]);
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ifp = ofp = NULL;
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obsolete(argv);
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while ((ch = getopt(argc, argv, "-cdf:s:u")) != -1)
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switch (ch) {
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case '-':
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--optind;
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goto done;
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case 'c':
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cflag = 1;
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break;
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case 'd':
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dflag = 1;
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break;
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case 'f':
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numfields = strtol(optarg, &p, 10);
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if (numfields < 0 || *p)
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errx(1, "illegal field skip value: %s", optarg);
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break;
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case 's':
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numchars = strtol(optarg, &p, 10);
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if (numchars < 0 || *p)
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errx(1, "illegal character skip value: %s",
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optarg);
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break;
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case 'u':
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uflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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done: argc -= optind;
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argv +=optind;
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switch(argc) {
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case 0:
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ifp = stdin;
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ofp = stdout;
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break;
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case 1:
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ifp = file(argv[0], "r");
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ofp = stdout;
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break;
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case 2:
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ifp = file(argv[0], "r");
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ofp = file(argv[1], "w");
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break;
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default:
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usage();
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}
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if ((p = fgetln(ifp, &psize)) == NULL)
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return 0;
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prevlinesize = prevlen = psize;
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if ((prevline = malloc(prevlinesize + 1)) == NULL)
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err(1, "malloc");
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(void)memcpy(prevline, p, prevlinesize);
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prevline[prevlinesize] = '\0';
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if (numfields || numchars)
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prevp = skip(prevline, &prevlen);
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else
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prevp = prevline;
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thislinesize = psize;
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if ((thisline = malloc(thislinesize + 1)) == NULL)
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err(1, "malloc");
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while ((p = fgetln(ifp, &psize)) != NULL) {
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if (psize > thislinesize) {
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if ((thisline = realloc(thisline, psize + 1)) == NULL)
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err(1, "realloc");
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thislinesize = psize;
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}
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thislen = psize;
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(void)memcpy(thisline, p, psize);
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thisline[psize] = '\0';
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/* If requested get the chosen fields + character offsets. */
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if (numfields || numchars) {
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thisp = skip(thisline, &thislen);
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} else {
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thisp = thisline;
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}
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/* If different, print; set previous to new value. */
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if (thislen != prevlen || strcmp(thisp, prevp)) {
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char *t;
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size_t ts;
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show(ofp, prevline);
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t = prevline;
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prevline = thisline;
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thisline = t;
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ts = prevlinesize;
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prevlinesize = thislinesize;
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thislinesize = ts;
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prevp = thisp;
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prevlen = thislen;
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repeats = 0;
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} else
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++repeats;
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}
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show(ofp, prevline);
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free(prevline);
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free(thisline);
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return 0;
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}
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/*
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* show --
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* Output a line depending on the flags and number of repetitions
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* of the line.
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*/
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static void
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show(FILE *ofp, const char *str)
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{
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if ((dflag && repeats == 0) || (uflag && repeats > 0))
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return;
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if (cflag) {
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(void)fprintf(ofp, "%4d %s", repeats + 1, str);
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} else {
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(void)fprintf(ofp, "%s", str);
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}
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}
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static const char *
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skip(const char *str, size_t *linesize)
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{
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int infield, nchars, nfields;
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size_t ls = *linesize;
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for (nfields = numfields, infield = 0; nfields && *str; ++str, --ls)
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if (isspace((unsigned char)*str)) {
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if (infield) {
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infield = 0;
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--nfields;
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}
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} else if (!infield)
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infield = 1;
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for (nchars = numchars; nchars-- && *str; ++str, --ls)
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continue;
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*linesize = ls;
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return str;
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}
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static FILE *
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file(const char *name, const char *mode)
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{
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FILE *fp;
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if ((fp = fopen(name, mode)) == NULL)
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err(1, "%s", name);
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return(fp);
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}
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static void
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obsolete(char *argv[])
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{
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char *ap, *p, *start;
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while ((ap = *++argv) != NULL) {
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/* Return if "--" or not an option of any form. */
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if (ap[0] != '-') {
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if (ap[0] != '+')
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return;
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} else if (ap[1] == '-')
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return;
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if (!isdigit((unsigned char)ap[1]))
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continue;
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/*
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* Digit signifies an old-style option. Malloc space for dash,
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* new option and argument.
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*/
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(void)asprintf(&p, "-%c%s", ap[0] == '+' ? 's' : 'f', ap + 1);
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if (!p)
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err(1, "malloc");
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start = p;
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*argv = start;
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}
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: %s [-cdu] [-f fields] [-s chars] "
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"[input_file [output_file]]\n", getprogname());
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exit(1);
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}
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