From a375561ca15a99dd7024e5b8170a3c8fcf25b892 Mon Sep 17 00:00:00 2001
From: Alex Auvolat <alex.auvolat@ens.fr>
Date: Sun, 30 Nov 2014 20:05:47 +0100
Subject: More library functions & renaming.

---
 kernel/Makefile         |  6 +++--
 kernel/include/printf.h |  3 ++-
 kernel/include/stdlib.h |  7 -----
 kernel/include/string.h | 13 ++++++++++
 kernel/l0/dbglog.c      |  2 +-
 kernel/lib/stdlib.c     |  8 ------
 kernel/lib/string.c     | 68 +++++++++++++++++++++++++++++++++++++++++++++++++
 7 files changed, 88 insertions(+), 19 deletions(-)
 delete mode 100644 kernel/include/stdlib.h
 create mode 100644 kernel/include/string.h
 delete mode 100644 kernel/lib/stdlib.c
 create mode 100644 kernel/lib/string.c

diff --git a/kernel/Makefile b/kernel/Makefile
index 6e973dd..04721ba 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -5,11 +5,11 @@ ASFLAGS = -felf
 CC = i586-elf-gcc
 CFLAGS = -ffreestanding -O2 -std=gnu99 -Wall -Wextra -I . -I ./include
 # CXX = i586-elf-g++
-# CXFLAGS = -ffreestanding -O2 -Wall -Wextra -I . -I ./include -fno-exceptions -fno-rtti
+# CXFLAGS = -ffreestanding -O3 -Wall -Wextra -I . -I ./include -fno-exceptions -fno-rtti
 LD = i586-elf-gcc
 LDFLAGS = -T linker.ld -ffreestanding -O2 -nostdlib -lgcc
 
-OBJ = lib/stdlib.o lib/printf.o l0/loader.o l0/kmain.o l0/dbglog.o l0/sys.o
+OBJ = lib/string.o lib/printf.o l0/loader.o l0/kmain.o l0/dbglog.o l0/sys.o
 OUT = kernel.bin
 
 all: $(OUT)
@@ -30,3 +30,5 @@ clean:
 	rm */*.o || true
 mrproper: clean
 	rm $(OUT)
+
+rebuild: mrproper all
diff --git a/kernel/include/printf.h b/kernel/include/printf.h
index 4569827..b37816d 100644
--- a/kernel/include/printf.h
+++ b/kernel/include/printf.h
@@ -1,6 +1,7 @@
 #pragma once
 
-#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
 #include <stdarg.h>
 
 int snprintf(char* s, size_t n, const char* format, ...);
diff --git a/kernel/include/stdlib.h b/kernel/include/stdlib.h
deleted file mode 100644
index 601e7c4..0000000
--- a/kernel/include/stdlib.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#pragma once
-
-#include <stddef.h>
-#include <stdint.h>
-
-size_t strlen(const char*);
-
diff --git a/kernel/include/string.h b/kernel/include/string.h
new file mode 100644
index 0000000..1eb3eef
--- /dev/null
+++ b/kernel/include/string.h
@@ -0,0 +1,13 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+void *memcpy(void *dest, const void *src, int count);
+void *memset(void *dest, int val, int count);
+
+size_t strlen(const char *str);
+char *strchr(const char *str, char c);
+char *strcpy(char *dest, const char *src);
+char *strcat(char *dest, const char *src);
+int strcmp(const char *s1, const char *s2);
diff --git a/kernel/l0/dbglog.c b/kernel/l0/dbglog.c
index 0285002..47098a0 100644
--- a/kernel/l0/dbglog.c
+++ b/kernel/l0/dbglog.c
@@ -1,5 +1,5 @@
 #include <stdarg.h>
-#include <stdlib.h>
+#include <string.h>
 #include <printf.h>
 #include <dbglog.h>
 #include <config.h>
diff --git a/kernel/lib/stdlib.c b/kernel/lib/stdlib.c
deleted file mode 100644
index 6710da2..0000000
--- a/kernel/lib/stdlib.c
+++ /dev/null
@@ -1,8 +0,0 @@
-#include <stdlib.h>
-
-size_t strlen(const char* str) {
-	size_t ret = 0;
-	while (str[ret] != 0)
-		ret++;
-	return ret;
-}
diff --git a/kernel/lib/string.c b/kernel/lib/string.c
new file mode 100644
index 0000000..da8f60e
--- /dev/null
+++ b/kernel/lib/string.c
@@ -0,0 +1,68 @@
+#include <string.h>
+
+
+size_t strlen(const char* str) {
+	size_t ret = 0;
+	while (str[ret] != 0)
+		ret++;
+	return ret;
+}
+
+char *strchr(const char *str, char c) {
+	while (*str) {
+		if (*str == c) return (char*)str;
+		str++;
+	}
+	return NULL;
+}
+
+char *strcpy(char *dest, const char *src) {
+	memcpy(dest, src, strlen(src) + 1);
+	return (char*)src;
+}
+
+char *strcat(char *dest, const char *src) {
+	char *dest2 = dest;
+	dest2 += strlen(dest) - 1;
+	while (*src) {
+		*dest2 = *src;
+		src++;
+		dest2++;
+	}
+	*dest2 = 0;
+	return dest;
+}
+
+int strcmp(const char *s1, const char *s2) {
+	while ((*s1) && (*s1 == *s2)) {
+		s1++;
+		s2++;
+	}
+	return (* (unsigned char*)s1 - *(unsigned char*)s2);
+}
+
+void *memcpy(void *vd, const void *vs, int count) {
+	uint8_t *dest = (uint8_t*)vd, *src = (uint8_t*)vs;
+	int f = count % 4, n = count / 4, i;
+	const uint32_t* s = (uint32_t*)src;
+	uint32_t* d = (uint32_t*)dest;
+	for (i = 0; i < n; i++) {
+		d[i] = s[i];
+	}
+	if (f != 0) {
+		for (i = count - f; i < count; i++) {
+			dest[i] = src[i];
+		}
+	}
+	return vd;
+}
+
+void *memset(void *dest, int val, int count) {
+	uint8_t *dest_c = (uint8_t*)dest;
+	int i;
+	for (i = 0; i < count; i++) {
+		dest_c[i] = val;
+	}
+	return dest;
+}
+
-- 
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