sbase/uniq.c

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C
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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <ctype.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 int dflag = 0;
static int uflag = 0;
static int fskip = 0;
static int sskip = 0;
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static char *prevline = NULL;
static char *prevoffset = NULL;
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static long prevlinecount = 0;
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static void
usage(void)
{
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eprintf("usage: %s [-c] [-d | -u] [-f fields] [-s chars] [file]\n", argv0);
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}
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int
main(int argc, char *argv[])
{
FILE *fp;
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ARGBEGIN {
case 'c':
countfmt = "%7ld ";
break;
case 'd':
dflag = 1;
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break;
case 'u':
uflag = 1;
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break;
case 'f':
fskip = estrtonum(EARGF(usage()), 0, INT_MAX);
break;
case 's':
sskip = estrtonum(EARGF(usage()), 0, INT_MAX);
break;
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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 char *
uniqskip(char *l)
{
char *lo = l;
int f = fskip, s = sskip;
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for (; f; --f) {
while (isblank(*lo))
lo++;
while (*lo && !isblank(*lo))
lo++;
}
for (; s && *lo && *lo != '\n'; --s, ++lo);
return lo;
}
static void
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uniqline(char *l)
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{
char *loffset = l ? uniqskip(l) : l;
int linesequel = (!l || !prevline)
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? l == prevline
: !strcmp(loffset, prevoffset);
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if (linesequel) {
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++prevlinecount;
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return;
}
if (prevline) {
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 = prevoffset = NULL;
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}
if (l) {
prevline = estrdup(l);
prevoffset = prevline + (loffset - l);
}
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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;
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while (getline(&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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}