git.y1.nz

commit 05078295b49e42b1c5438460ed47d713716a033a
parent dc96f12d8e42e53df7f9b6600243537ffc72fa57
Author: Toxa <untoxa@mail.ru>
Date:   Mon,  6 Sep 2021 00:34:37 +0300

SMS/GG: memset()

Diffstat:
M
gbdk-lib/include/asm/z80/string.h
2
+-
M
gbdk-lib/libc/asm/z80/Makefile
2
+-
A
gbdk-lib/libc/asm/z80/memset.s
28
++++++++++++++++++++++++++++

3 files changed, 30 insertions(+), 2 deletions(-)
diff --git a/gbdk-lib/include/asm/z80/string.h b/gbdk-lib/include/asm/z80/string.h
@@ -51,7 +51,7 @@ void *memmove (void *dest, const void *src, size_t n);
     @param c         char value to fill with (truncated from int)
     @param n         Number of bytes to fill
 */
-void *memset (void *s, int c, size_t n) NONBANKED;
+void *memset (void *s, int c, size_t n) __z88dk_callee;
 
 /** Reverses the characters in a string
 
diff --git a/gbdk-lib/libc/asm/z80/Makefile b/gbdk-lib/libc/asm/z80/Makefile
@@ -10,7 +10,7 @@ ASSRC = __strreverse.s strcpy.s strlen.s \
 	mul.s mulchar.s \
 	__itoa.s __ltoa.s \
 	__uitobcd.s __ultobcd.s \
-	memcpy.s memmove.s \
+	memcpy.s memmove.s memset.s \
 	setjmp.s \
 	abs.s \
 	rand.s arand.s \
diff --git a/gbdk-lib/libc/asm/z80/memset.s b/gbdk-lib/libc/asm/z80/memset.s
@@ -0,0 +1,28 @@
+        .area   _CODE
+
+;; void *memset (void *s, int c, size_t n) __z88dk_callee;
+_memset::
+        pop af
+        pop hl
+        pop de
+        pop bc
+        push af
+
+        ld a, b
+        or c
+        ret z
+
+        ld (hl), e
+        dec bc
+
+        ld a, b
+        or c
+        ret z
+
+        ld d, h
+        ld e, l
+        inc de
+
+        ldir
+        ret
+

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