zebra

commit ecff068f64c888607101756cc78561bb20893ae6
Author: William Casarin <jb55@jb55.com>
Date:   Thu, 31 Oct 2019 08:48:08 -0700

initial commit

Signed-off-by: William Casarin <jb55@jb55.com>

Diffstat:
A
.gitignore
 | 
1
+
A
Makefile
 | 
3
+++
A
README
 | 
13
+++++++++++++
A
zebra.c
 | 
46
++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 63 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+/zebra
diff --git a/Makefile b/Makefile
@@ -0,0 +1,3 @@
+
+zebra: zebra.c
+	$(CC) $< -o $@
diff --git a/README b/README
@@ -0,0 +1,13 @@
+
+zebra
+=====
+
+Add zebra lines from stdin to stdout 
+
+
+Usage
+-----
+
+$ zebra < file
+
+$ ps aux | zebra | less -S
diff --git a/zebra.c b/zebra.c
@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define streq(a,b) strcmp(a,b) == 0
+#define RESET printf("\x1B[0m")
+
+void usage()
+{
+	printf("usage: zebra [file]\n");
+	exit(1);
+}
+
+int main(int argc, const char* argv[])
+{
+	int c;
+	int alt = 0;
+
+	if (argc >= 2 && streq(argv[1], "--help")) {
+		usage();
+	}
+
+	// TODO: files
+	FILE *stream = stdin;
+
+	while (1) {
+		c = getc(stream);
+
+		if (c == EOF)
+			break;
+
+		putc(c, stdout);
+
+		if (c == '\n') {
+			alt ^= 1;
+			if (alt) {
+				printf("\x1B[48;5;8m");
+			}
+			else {
+				RESET;
+			}
+		}
+	}
+
+	RESET;
+}