From 93bf62580a68533dc8252b9a2a055c02f34ecb67 Mon Sep 17 00:00:00 2001
From: Christian Cunningham <cc@localhost>
Date: Thu, 24 Mar 2022 09:38:08 -0700
Subject: Modularized

---
 kernel/lib/strings.c | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 119 insertions(+)
 create mode 100644 kernel/lib/strings.c

(limited to 'kernel/lib/strings.c')

diff --git a/kernel/lib/strings.c b/kernel/lib/strings.c
new file mode 100644
index 0000000..674af19
--- /dev/null
+++ b/kernel/lib/strings.c
@@ -0,0 +1,119 @@
+#include <lib/kmem.h>
+#include <lib/strings.h>
+
+unsigned long strlen(string_t s)
+{
+	unsigned long len = 0;
+	while (s[len] != 0) {
+		len += 1;
+	}
+	return len;
+}
+
+void strcpy(string_t src, string_t dest)
+{
+	unsigned long idx = 0;
+	while (src[idx] != 0) {
+		dest[idx] = src[idx];
+		idx++;
+	}
+	dest[idx] = src[idx];
+}
+
+unsigned char strcmp(string_t a, string_t b)
+{
+	unsigned long idx = 0;
+	while (a[idx] != 0 && b[idx] != 0) {
+		if (a[idx] != b[idx]) {
+			return 0;
+		}
+		idx += 1;
+	}
+	return a[idx] == b[idx];
+}
+
+unsigned char strcmpn(string_t a, string_t b, unsigned int n)
+{
+	unsigned long idx = 0;
+	while (a[idx] != 0 && b[idx] != 0 && idx+1 < n) {
+		if (a[idx] != b[idx]) {
+			return 0;
+		}
+		idx += 1;
+	}
+	return a[idx] == b[idx];
+}
+
+char* zhex32_to_str(unsigned long value)
+{
+	static char data[10];
+	char tmp = 0;
+	char isz = -1;
+	for (int i = 0; i < 8; i++) {
+		tmp = (value >> 4*(8-i-1))&0xF;
+		if (isz == 0xFF && tmp != 0)
+			isz = i;
+		if(tmp > 0x9)
+			tmp += 7;
+		tmp += 0x30;
+		data[i] = tmp;
+	}
+	return data+isz;
+}
+
+char* hex32_to_str(unsigned long value)
+{
+	static char data[10];
+	char tmp = 0;
+	for (int i = 0; i < 8; i++) {
+		tmp = (value >> 4*(8-i-1))&0xF;
+		if(tmp > 0x9)
+			tmp += 7;
+		tmp += 0x30;
+		data[i] = tmp;
+	}
+	return data;
+}
+
+char* u32_to_str(unsigned long value)
+{
+	unsigned long t = value;
+	unsigned long c;
+	static char data[12];
+	char* dptr = data + 9;
+	for (int i = 0; i <= 10; i++) {
+		c = t%10;
+		*dptr = 0x30 + (c&0xF);
+		t /= 10;
+		if (t==0)
+			break;
+		dptr -= 1;
+	}
+	return dptr;
+}
+
+char* s32_to_str(unsigned long value)
+{
+	long t = value;
+	unsigned long c;
+	char is_neg = 0;
+	if (t < 0) {
+		t = -t;
+		is_neg = 1;
+	}
+	static char data[13];
+	char* dptr = data + 10;
+	for (int i = 0; i <= 10; i++) {
+		c = t%10;
+		*dptr = 0x30 + (c&0xF);
+		t /= 10;
+		if (t==0)
+			break;
+		dptr -= 1;
+	}
+	if (is_neg) {
+		dptr -= 1;
+		*dptr = '-';
+	}
+	return dptr;
+}
-- 
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