uniq: Initial commit

This commit is contained in:
Robert Ransom 2012-05-21 23:24:28 +00:00
parent 85b84675f1
commit 85efaad43b
2 changed files with 98 additions and 1 deletions

View File

@ -54,6 +54,7 @@ SRC = \
true.c \ true.c \
tty.c \ tty.c \
uname.c \ uname.c \
uniq.c \
seq.c \ seq.c \
wc.c \ wc.c \
yes.c yes.c
@ -66,7 +67,7 @@ all: $(BIN)
$(OBJ): util.h config.mk $(OBJ): util.h config.mk
$(BIN): util.a $(BIN): util.a
cat.o fold.o grep.o nl.o sort.o tail.o: text.h cat.o fold.o grep.o nl.o sort.o tail.o uniq.o: text.h
cp.o mv.o rm.o: fs.h cp.o mv.o rm.o: fs.h
.o: .o:

96
uniq.c Normal file
View File

@ -0,0 +1,96 @@
/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "text.h"
#include "util.h"
static void uniq_line(char *);
static void uniq(FILE *, const char *);
static void uniq_finish(void);
static const char *countfmt = "";
static bool dflag = false;
static bool uflag = false;
static char *prev_line = NULL;
static long prev_line_count = 0;
int
main(int argc, char *argv[])
{
int c;
FILE *fp;
while((c = getopt(argc, argv, "cdu")) != -1)
switch(c) {
case 'c':
countfmt = "%7ld ";
break;
case 'd':
dflag = true;
break;
case 'u':
uflag = true;
break;
default:
exit(2);
}
if(optind == argc)
uniq(stdin, "<stdin>");
else for(; optind < argc; optind++) {
if(!(fp = fopen(argv[optind], "r")))
eprintf("fopen %s:", argv[optind]);
uniq(fp, argv[optind]);
fclose(fp);
}
uniq_finish();
return EXIT_SUCCESS;
}
void
uniq_line(char *l)
{
bool lines_equal = ((l == NULL) || (prev_line == NULL))
? l == prev_line
: !strcmp(l, prev_line);
if(lines_equal) {
++prev_line_count;
return;
}
if(prev_line != NULL) {
if((prev_line_count == 1 && !dflag) ||
(prev_line_count != 1 && !uflag)) {
printf(countfmt, prev_line_count);
fputs(prev_line, stdout);
}
free(prev_line);
prev_line = NULL;
}
if(l && !(prev_line = strdup(l)))
eprintf("strdup:");
prev_line_count = 1;
}
void
uniq(FILE *fp, const char *str)
{
char *buf = NULL;
size_t size = 0;
while(afgets(&buf, &size, fp))
uniq_line(buf);
}
void
uniq_finish()
{
uniq_line(NULL);
}