From 4d6c6fd8dd6b552f650e1e5d58ff3cad4fc2b5ee Mon Sep 17 00:00:00 2001
From: "E. Almqvist" <elalmqvist@gmail.com>
Date: Sat, 28 Aug 2021 14:19:21 +0200
Subject: [PATCH] str stuff

---
 kernel/kernel.c |  3 ++-
 lib/str.c       | 21 +++++++++++++++++++++
 lib/str.h       |  2 ++
 lib/strf.c      | 16 ++++++++--------
 lib/strf.h      |  2 +-
 5 files changed, 34 insertions(+), 10 deletions(-)
 create mode 100644 lib/str.c
 create mode 100644 lib/str.h

diff --git a/kernel/kernel.c b/kernel/kernel.c
index 7fbcba1..f7ea26c 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -6,7 +6,8 @@ void main() {
 			// i.e. clear the screen et cetera.
 
 	int test = 1234;
-	char* teststr = int_to_str(test);
+	char* teststr;
+	teststr = int_to_str(test, teststr);
 	println(teststr, 0xf0);
 
 	set_cursor_pos(28, 2);
diff --git a/lib/str.c b/lib/str.c
new file mode 100644
index 0000000..a0a7ef7
--- /dev/null
+++ b/lib/str.c
@@ -0,0 +1,21 @@
+#include "str.h"
+
+unsigned int strlen(char* str) {
+	char* c;
+	for( c = str; *c != '\0'; c++ ) 	// search for end-of-string
+
+	return (unsigned int)(c - str);		// get size by delta-address
+
+}
+
+char* strcat(char* buf, char* str) {
+	unsigned int bufferlen = strlen(buf);
+
+	// remove the 0x0 char from the buffer
+	*(buf + bufferlen) = 0x3f;		// placeholder
+
+	// concat the str to buf
+	for( char* c = str; *c != '\0'; c++ ) {
+		
+	}
+}
diff --git a/lib/str.h b/lib/str.h
new file mode 100644
index 0000000..f50e596
--- /dev/null
+++ b/lib/str.h
@@ -0,0 +1,2 @@
+unsigned int strlen(char* str);
+char* strcat(char* buf, char* str);
diff --git a/lib/strf.c b/lib/strf.c
index 5259262..65dddc7 100644
--- a/lib/strf.c
+++ b/lib/strf.c
@@ -3,13 +3,13 @@
 #define int_offset 48
 // 0:48 - 9:57
 
-char* int_to_str(int i) {
-	char* strbuf = "XXXXXX";
-
-	while( i > 0 ) {
-		*(strbuf + 1) = (i % 10) + int_offset;
-		i /= 10;
+char* int_to_str(int i, char* strbuf) {
+	if( i == 0 ) {
+		return (char*)(int_offset);
+	} else {
+		char cbuf;
+		cbuf = (char)((i % 10) + int_offset);
+
+		return int_to_str(i / 10, strbuf + cbuf);
 	}
-
-	return strbuf;
 }
diff --git a/lib/strf.h b/lib/strf.h
index 2046d91..29649bc 100644
--- a/lib/strf.h
+++ b/lib/strf.h
@@ -1 +1 @@
-char* int_to_str(int i);
+char* int_to_str(int i, char* strbuf);