1993-03-21 12:45:37 +03:00
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/*
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* Copyright (c) 1989 The Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)uniq.c 5.2 (Berkeley) 6/1/90";
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#endif /* not lint */
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#include <stdio.h>
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#include <ctype.h>
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int cflag, dflag, uflag;
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int numchars, numfields, repeats;
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#define MAXLINELEN (2048 + 1)
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main (argc,argv)
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int argc;
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char **argv;
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{
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extern int optind;
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FILE *ifp, *ofp, *file();
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int ch;
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register char *t1, *t2;
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char *prevline, *thisline, *malloc(), *skip();
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while ((ch = getopt(argc, argv, "-cdu123456789")) != EOF)
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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 'u':
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uflag = 1;
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break;
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/*
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* since -n is a valid option that could be picked up by
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* getopt, but is better handled by the +n and -n code, we
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* break out.
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*/
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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--optind;
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goto done;
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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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/* if no flags are set, default is -d -u */
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if (cflag) {
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if (dflag || uflag)
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usage();
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} else if (!dflag && !uflag)
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dflag = uflag = 1;
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/* because of the +, getopt is messed up */
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1993-04-26 19:03:05 +04:00
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for (; *argv && (**argv == '+' || **argv == '-'); ++argv, --argc)
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1993-03-21 12:45:37 +03:00
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switch (**argv) {
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case '+':
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if ((numchars = atoi(*argv + 1)) < 0)
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goto negerr;
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break;
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case '-':
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if ((numfields = atoi(*argv + 1)) < 0) {
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negerr: (void)fprintf(stderr,
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"uniq: negative field/char skip value.\n");
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usage();
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}
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break;
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}
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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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prevline = malloc(MAXLINELEN);
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thisline = malloc(MAXLINELEN);
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(void)fgets(prevline, MAXLINELEN, ifp);
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while (fgets(thisline, MAXLINELEN, ifp)) {
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/* if requested get the chosen fields + character offsets */
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if (numfields || numchars) {
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t1 = skip(thisline);
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t2 = skip(prevline);
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} else {
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t1 = thisline;
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t2 = prevline;
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}
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/* if different, print; set previous to new value */
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if (strcmp(t1, t2)) {
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show(ofp, prevline);
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t1 = prevline;
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prevline = thisline;
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thisline = t1;
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repeats = 0;
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}
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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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exit(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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show(ofp, str)
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FILE *ofp;
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char *str;
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{
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if (cflag)
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(void)fprintf(ofp, "%4d %s", repeats + 1, str);
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if (dflag && repeats || uflag && !repeats)
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(void)fprintf(ofp, "%s", str);
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}
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char *
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skip(str)
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register char *str;
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{
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register int infield, nchars, nfields;
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for (nfields = numfields, infield = 0; nfields && *str; ++str)
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if (isspace(*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);
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return(str);
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}
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FILE *
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file(name, mode)
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char *name, *mode;
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{
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FILE *fp;
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if (!(fp = fopen(name, mode))) {
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(void)fprintf(stderr, "uniq: can't open %s.\n", name);
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exit(1);
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}
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return(fp);
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}
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usage()
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{
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(void)fprintf(stderr,
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"usage: uniq [-c | -du] [- #fields] [+ #chars] [input [output]]\n");
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exit(1);
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}
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