mirror of
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104 lines
1.5 KiB
C
104 lines
1.5 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <stdio.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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#include "text.h"
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#include "util.h"
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static void uniqline(char *);
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static void uniq(FILE *, const char *);
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static void uniqfinish(void);
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static const char *countfmt = "";
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static int dflag = 0;
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static int uflag = 0;
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static char *prevline = NULL;
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static long prevlinecount = 0;
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static void
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usage(void)
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{
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eprintf("usage: %s [-cdiu] [input]]\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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FILE *fp;
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ARGBEGIN {
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case 'i':
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eprintf("not implemented\n");
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case 'c':
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countfmt = "%7ld ";
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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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default:
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usage();
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} ARGEND;
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if (argc == 0) {
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uniq(stdin, "<stdin>");
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} else if (argc == 1) {
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if (!(fp = fopen(argv[0], "r")))
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eprintf("fopen %s:", argv[0]);
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uniq(fp, argv[0]);
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fclose(fp);
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} else
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usage();
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uniqfinish();
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return 0;
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}
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static void
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uniqline(char *l)
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{
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int linesequel = (!l || !prevline)
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? l == prevline
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: !strcmp(l, prevline);
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if (linesequel) {
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++prevlinecount;
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return;
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}
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if (prevline) {
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if ((prevlinecount == 1 && !dflag) ||
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(prevlinecount != 1 && !uflag)) {
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printf(countfmt, prevlinecount);
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fputs(prevline, stdout);
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}
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free(prevline);
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prevline = NULL;
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}
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if (l)
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prevline = estrdup(l);
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prevlinecount = 1;
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}
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static void
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uniq(FILE *fp, const char *str)
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{
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char *buf = NULL;
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size_t size = 0;
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while (agetline(&buf, &size, fp) != -1)
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uniqline(buf);
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}
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static void
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uniqfinish(void)
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{
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uniqline(NULL);
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}
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