sbase/uniq.c

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C
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/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include "util.h"
static void uniqline(FILE *, char *);
static void uniq(FILE *, FILE *);
static void uniqfinish(FILE *);
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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)
{
eprintf("usage: %s [-c] [-d | -u] [-f fields] [-s chars]"
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" [input [output]]\n", argv0);
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}
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int
main(int argc, char *argv[])
{
FILE *fp = stdin, *ofp = stdout;
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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 > 2)
usage();
if (argc == 0) {
uniq(stdin, stdout);
} else if (argc >= 1) {
if (strcmp(argv[0], "-") && !(fp = fopen(argv[0], "r")))
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eprintf("fopen %s:", argv[0]);
if (argc == 2) {
if (strcmp(argv[1], "-") &&
!(ofp = fopen(argv[1], "w")))
eprintf("fopen %s:", argv[1]);
}
uniq(fp, ofp);
if (fp != stdin)
fclose(fp);
} else
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usage();
uniqfinish(ofp);
if (ofp != stdout)
fclose(ofp);
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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
uniqline(FILE *ofp, 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)) {
fprintf(ofp, countfmt, prevlinecount);
fputs(prevline, ofp);
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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
uniq(FILE *fp, FILE *ofp)
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{
char *buf = NULL;
size_t size = 0;
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while (getline(&buf, &size, fp) != -1)
uniqline(ofp, buf);
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}
static void
uniqfinish(FILE *ofp)
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{
uniqline(ofp, NULL);
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}