commit 85efaad43b62f999713589c64134dd2d2aff32a5
parent 85b84675f1c519837e82925fcc3654d05a6f10cd
Author: Robert Ransom <rransom.8774@gmail.com>
Date: Mon, 21 May 2012 23:24:28 +0000
uniq: Initial commit
Diffstat:
| M | Makefile | | | 3 | ++- |
| A | uniq.c | | | 96 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
2 files changed, 98 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -54,6 +54,7 @@ SRC = \
true.c \
tty.c \
uname.c \
+ uniq.c \
seq.c \
wc.c \
yes.c
@@ -66,7 +67,7 @@ all: $(BIN)
$(OBJ): util.h config.mk
$(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
.o:
diff --git a/uniq.c b/uniq.c
@@ -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);
+}
