sbase/uniq.c

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