+/*
+ * Copyright (c) 1989 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
+char copyright[] =
+"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)uniq.c 5.2 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+#include <stdio.h>
+#include <ctype.h>
+
+int cflag, dflag, uflag;
+int numchars, numfields, repeats;
+
+#define MAXLINELEN (2048 + 1)
+
+main (argc,argv)
+ int argc;
+ char **argv;
+{
+ extern int optind;
+ FILE *ifp, *ofp, *file();
+ int ch;
+ register char *t1, *t2;
+ char *prevline, *thisline, *malloc(), *skip();
+
+ while ((ch = getopt(argc, argv, "-cdu123456789")) != EOF)
+ switch (ch) {
+ case '-':
+ --optind;
+ goto done;
+ case 'c':
+ cflag = 1;
+ break;
+ case 'd':
+ dflag = 1;
+ break;
+ case 'u':
+ uflag = 1;
+ break;
+ /*
+ * since -n is a valid option that could be picked up by
+ * getopt, but is better handled by the +n and -n code, we
+ * break out.
+ */
+ case '1': case '2': case '3': case '4':
+ case '5': case '6': case '7': case '8': case '9':
+ --optind;
+ goto done;
+ 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;
+
+ /* because of the +, getopt is messed up */
+ for (; **argv == '+' || **argv == '-'; ++argv, --argc)
+ switch (**argv) {
+ case '+':
+ if ((numchars = atoi(*argv + 1)) < 0)
+ goto negerr;
+ break;
+ case '-':
+ if ((numfields = atoi(*argv + 1)) < 0) {
+negerr: (void)fprintf(stderr,
+ "uniq: negative field/char skip value.\n");
+ usage();
+ }
+ break;
+ }
+
+ 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);
+ (void)fgets(prevline, MAXLINELEN, ifp);
+
+ 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.
+ */
+show(ofp, str)
+ FILE *ofp;
+ char *str;
+{
+ if (cflag)
+ (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))) {
+ (void)fprintf(stderr, "uniq: can't open %s.\n", name);
+ exit(1);
+ }
+ return(fp);
+}
+
+usage()
+{
+ (void)fprintf(stderr,
+ "usage: uniq [-c | -du] [- #fields] [+ #chars] [input [output]]\n");
+ exit(1);
+}
projects / unix-history / commitdiff