From 6bd06e042da524448dae7e48a7499517948be2b8 Mon Sep 17 00:00:00 2001
From: Tomasz Kramkowski <tk@the-tk.com>
Date: Thu, 24 Nov 2016 21:55:24 +0000
Subject: don't use memcpy and memset for now

---
 Makefile     |  2 +-
 lib/string.c | 38 --------------------------------------
 lib/string.h | 10 ----------
 setup.c      |  6 ++++--
 4 files changed, 5 insertions(+), 51 deletions(-)
 delete mode 100644 lib/string.c
 delete mode 100644 lib/string.h

diff --git a/Makefile b/Makefile
index acae6d2..bb11f1f 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ CFLAGS = -std=c11 $(WARNINGS) -O2 -flto -MMD -MP -ffreestanding -nostdlib -Ilib
 LDFLAGS = -T layout.ld -O2 -flto -ffreestanding -nostdlib
 ASFLAGS = $(TARGET_ARCH)
 
-OBJ := crt0.o vectors.o flashconf.o setup.o fmk.o lib/string.o lib/le.o usb/usb.o usb/endpt0.o usb/endpt1.o
+OBJ := crt0.o vectors.o flashconf.o setup.o fmk.o lib/le.o usb/usb.o usb/endpt0.o usb/endpt1.o
 
 %.bin: %
 	$(OBJCOPY) -O binary $< $@
diff --git a/lib/string.c b/lib/string.c
deleted file mode 100644
index 25935b3..0000000
--- a/lib/string.c
+++ /dev/null
@@ -1,38 +0,0 @@
-#include <string.h>
-#include <stddef.h>
-
-void *memcpy(void * restrict _dest, const void * restrict _src, size_t n)
-{
-	unsigned char *dest = _dest;
-	const unsigned char *src = _src;
-
-	for (size_t i = 0; i < n; i++)
-		dest[i] = src[i];
-
-	return dest;
-}
-
-void *memmove(void *_dest, const void *_src, size_t n)
-{
-	unsigned char *dest = _dest;
-	const unsigned char *src = _src;
-
-	if (_src < _dest) {
-		for (size_t i = 0; i < n; i++)
-			dest[i] = src[i];
-	} else {
-		for (size_t i = n; i > 0; i++)
-			dest[i - 1] = src[i - 1];
-	}
-
-	return dest;
-}
-
-void *memset(void *_s, int _c, size_t n)
-{
-	unsigned char *s = _s, c = (unsigned char)_c;
-	for (size_t i = 0; i < n; i++)
-		s[i] = c;
-
-	return _s;
-}
diff --git a/lib/string.h b/lib/string.h
deleted file mode 100644
index 9c204dd..0000000
--- a/lib/string.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef LIB_STRING_H
-#define LIB_STRING_H
-
-#include <stddef.h>
-
-void *memcpy(void * restrict dest, const void * restrict src, size_t n);
-void *memmove(void *dest, const void *src, size_t n);
-void *memset(void *s, int c, size_t n);
-
-#endif /* LIB_STRING_H */
diff --git a/setup.c b/setup.c
index 9cb0312..cb83eb4 100644
--- a/setup.c
+++ b/setup.c
@@ -31,8 +31,10 @@ void setup(void)
 	UNSET_BIT(WDOG_STCTRLH, STCTRLH_WDOGEN);
 
 	/* Copy data and clear bss */
-	memcpy(_sdata, _ldata, _edata - _sdata);
-	memset(_sbss, 0, _ebss - _sbss);
+	for (size_t i = 0; i < (size_t)(_edata - _sdata); i++)
+		_sdata[i] = _ldata[i];
+	for (size_t i = 0; i < (size_t)(_ebss - _sbss); i++)
+		_sbss[i] = 0;
 
 	/* Enable port clocks */
 	SIM_SCGC5 |= BV(SCGC5_PORTE) | BV(SCGC5_PORTD) | BV(SCGC5_PORTC)
-- 
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