sbase/uniq.c
FRIGN 7fc5856e64 Tweak NULL-pointer checks
Use !p and p when comparing pointers as opposed to explicit
checks against NULL.  This is generally easier to read.
2014-11-14 10:54:30 +00:00

104 lines
1.6 KiB
C

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