Use a subroutine to set errno to save some space.

git-svn-id: svn://svn.cc65.org/cc65/trunk@3032 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/Makefile

@@ -67,6 +67,7 @@ S_OBJS = 	_cwd.o          \
                 _heapmemavail.o \
 	 	_oserror.o	\
 		_printf.o 	\
+                _seterrno.o     \
 		_swap.o	  	\
 	 	_sys.o	  	\
 		abs.o	  	\

libsrc/common/_fopen.s

@@ -69,10 +69,8 @@
 
 invmode:
         lda     #EINVAL
-        sta     __errno
+        jsr     __seterrno      ; Set __errno, returns zero in A
-        lda     #0
+        tax                     ; a/x = 0
-        sta     __errno+1
-        tax
         jmp     incsp4
 
 ; Mode string successfully parsed. Store the binary mode onto the stack in

libsrc/common/_seterrno.s

@@ -0,0 +1,22 @@
+;
+; Ullrich von Bassewitz, 2004-05-13
+;
+; __seterrno: Will set __errno to the value in A and return zero in A. Other
+;             registers aren't changed. The function is C callable, but 
+;             currently only called from asm code.
+;
+
+      	.include        "errno.inc"
+
+.code
+
+.proc   __seterrno
+
+        sta     __errno
+        lda     #0
+        sta     __errno+1
+        rts
+
+.endproc
+
+

libsrc/common/atexit.s

@@ -38,10 +38,8 @@
 ; Error, no space left
 
 @Error:	lda	#ENOSPC	      	; No space left
-      	sta	__errno
+        jsr     __seterrno
-      	ldx	#$00
+       	ldx     #$FF            ; Return -1
-      	stx	__errno+1
-      	dex			; Make return value -1
       	txa
       	rts
 

libsrc/common/fclose.s

@@ -31,11 +31,9 @@
 ; File is not open
 
         lda     #EINVAL
-        sta     __errno
+        jsr     __seterrno
-        ldx     #0
+        lda     #$FF            ; Return -1
-        stx     __errno+1
+        tax
-        dex
-        txa
         rts
 
 ; File is open. Reset the flags and close the file.

libsrc/common/fopen.s

@@ -36,9 +36,7 @@
 ; Failed to allocate a file stream
 
         lda     #EMFILE
-        sta     __errno
+        jsr     __seterrno      ; Set __errno, will return 0 in A
-        lda     #0
-        sta     __errno+1
         tax
         rts                     ; Return zero
 

libsrc/common/fread.s

@@ -39,9 +39,7 @@
 ; File not open
 
    	lda    	#EINVAL
-   	sta  	__errno
+        jsr     __seterrno
-   	lda  	#0
-   	sta  	__errno+1
 @L1:    jsr     incsp6
         jmp     return0
 

libsrc/common/fwrite.s

@@ -39,9 +39,7 @@
 ; File not open
 
    	lda	#EINVAL
-   	sta	__errno
+        jsr     __seterrno
-   	lda	#0
-   	sta	__errno+1
 @L1:    jsr     incsp6
         jmp     return0
 

libsrc/common/time.s

@@ -53,10 +53,8 @@
 @L1:    ldy     sreg+1
         bpl     @L2
                   
-        lda     #$00
-        sta     __errno+1
         lda     #ENOSYS         ; Function not implemented
-        sta     __errno
+        jsr     __seterrno      ; Set __errno
 
 ; Reload the low byte of the result and return