From 776dd74325db2a1fddcb830e3ddb42ebee0516ea Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Hru=C5=A1ka?= <ondra@ondrovo.com>
Date: Sat, 31 Dec 2022 11:50:29 +0100
Subject: [PATCH] add files

---
 .gitignore |  4 ++++
 main.c     | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 main.c

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ecf86be
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.idea/
+*.o
+bsplit
+
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..affcd20
--- /dev/null
+++ b/main.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+#define MAX(a,b) ((a)>(b)?(a):(b))
+#define MIN(a,b) ((a)<(b)?(a):(b))
+
+int main(int argc, char *argv[]) {
+	for (int i = 1; i < argc; i++) {
+		if (0==strcmp(argv[i], "-h") || 0==strcmp(argv[i], "--help")) {
+			fprintf(stderr, "binary split\nArguments: file start end\nStart and end are byte indexes. End is optional\n");
+			return 1;
+		}
+	}
+	
+	if (argc < 3) {
+		fprintf(stderr, "Bad argc\n");
+		return 1;
+	}
+	size_t pos = atol(argv[2]);
+	
+	size_t take = argc==4?atol(argv[3]):0;
+	
+	FILE * f = fopen(argv[1], "rb"); 
+	fseek(f, pos, SEEK_SET);
+	
+#define CHUNKSZ 8192
+	
+	unsigned char chunk[CHUNKSZ];
+	
+	while (1) {
+		size_t maxtake = take==0?CHUNKSZ : MIN(take, CHUNKSZ);
+		size_t len = fread(chunk, 1, maxtake, f);
+		if (errno != 0 || len == 0) {
+			break;
+		}
+		
+		fwrite(chunk, 1, len, stdout);
+		
+		if (take > 0) {
+			take -= len;
+			if (take == 0) break;
+		}
+	}	
+	
+	return 0;
+}