Added more details about how the CBM exec() works.

[cc65] / libsrc / cbm / oserror.s

diff --git a/libsrc/cbm/oserror.s b/libsrc/cbm/oserror.s
index 1f40685cb99b6b8338af2cf204cd8983d99b4e99..29980548a2373d2be1f0b5729f8a6844d5afecb5 100644 (file)
--- a/libsrc/cbm/oserror.s
+++ b/libsrc/cbm/oserror.s
@@ -5,74 +5,73 @@
 ; /* Map a system specific error into a system independent code */
 ;
 
-       .export         __osmaperrno
-       .include        "errno.inc"
+        .include        "errno.inc"
 
 .code
 
 __osmaperrno:
-       ldx     #ErrTabSize
-@L1:   cmp     ErrTab-2,x      ; Search for the error code
-       beq     @L2             ; Jump if found
-       dex
-       dex
-       bne     @L1             ; Next entry
+        ldx     #ErrTabSize
+@L1:    cmp     ErrTab-2,x      ; Search for the error code
+        beq     @L2             ; Jump if found
+        dex
+        dex
+        bne     @L1             ; Next entry
 
 ; Code not found, return EUNKNOWN
 
-       lda     #<EUNKNOWN
-       ldx     #>EUNKNOWN
-       rts
+        lda     #<EUNKNOWN
+        ldx     #>EUNKNOWN
+        rts
 
 ; Found the code
 
-@L2:   lda     ErrTab-1,x
-       ldx     #$00            ; High byte always zero
-       rts
+@L2:    lda     ErrTab-1,x
+        ldx     #$00            ; High byte always zero
+        rts
 
 .rodata
 
 ErrTab:
-       .byte   1, EMFILE       ; Too many open files
-       .byte   2, EINVAL       ; File is open
-       .byte   3, EINVAL       ; File not open
-       .byte   4, ENOENT       ; File not found
-       .byte   5, ENODEV       ; Device not present
-       .byte   6, EINVAL       ; File not input
-       .byte   7, EINVAL       ; File not output
-       .byte   8, EINVAL       ; Filename missing
-       .byte   9, ENODEV       ; Ilegal device
-;      .byte  20,              ; Read error
-;              .byte  21,              ; Read error
-;      .byte  22,              ; Read error
-;              .byte  23,              ; Read error
-;              .byte  24,              ; Read error
-;              .byte  25,              ; Write error
-       .byte  26, EACCES       ; Write protect on
-;              .byte  27,              ; Read error
-;              .byte  28,              ; Write error
-;              .byte  29,              ; Disk ID mismatch
-;              .byte  30,              ; Syntax error
-;              .byte  31,              ; Syntax error
-;              .byte  32,              ; Syntax error
-               .byte  33, EINVAL       ; Syntax error (invalid file name)
-               .byte  34, EINVAL       ; Syntax error (no file given)
-;              .byte  39,              ; Syntax error
-;              .byte  50,              ; Record not present
-;              .byte  51,              ; Overflow in record
-;      .byte  52,              ; File too large
-       .byte  60, EINVAL       ; Write file open
-       .byte  61, EINVAL       ; File not open
-       .byte  62, ENOENT       ; File not found
-       .byte  63, EEXIST       ; File exists
-       .byte  64, EINVAL       ; File type mismatch
-;      .byte  65,              ; No block
-;      .byte  66,              ; Illegal track or sector
-;              .byte  67,              ; Illegal system track or sector
-       .byte  70, EBUSY        ; No channel
-;              .byte  71,              ; Directory error
-;      .byte  72,              ; Disk full
-;              .byte  73,              ; DOS version mismatch
+        .byte   1, EMFILE       ; Too many open files
+        .byte   2, EINVAL       ; File is open
+        .byte   3, EINVAL       ; File not open
+        .byte   4, ENOENT       ; File not found
+        .byte   5, ENODEV       ; Device not present
+        .byte   6, EINVAL       ; File not input
+        .byte   7, EINVAL       ; File not output
+        .byte   8, EINVAL       ; Filename missing
+        .byte   9, ENODEV       ; Ilegal device
+;       .byte  20,              ; Read error
+;       .byte  21,              ; Read error
+;       .byte  22,              ; Read error
+;       .byte  23,              ; Read error
+;       .byte  24,              ; Read error
+;       .byte  25,              ; Write error
+        .byte  26, EACCES       ; Write protect on
+;       .byte  27,              ; Read error
+;       .byte  28,              ; Write error
+;       .byte  29,              ; Disk ID mismatch
+;       .byte  30,              ; Syntax error
+;       .byte  31,              ; Syntax error
+;       .byte  32,              ; Syntax error
+        .byte  33, EINVAL       ; Syntax error (invalid file name)
+        .byte  34, EINVAL       ; Syntax error (no file given)
+;       .byte  39,              ; Syntax error
+;       .byte  50,              ; Record not present
+;       .byte  51,              ; Overflow in record
+;       .byte  52,              ; File too large
+        .byte  60, EINVAL       ; Write file open
+        .byte  61, EINVAL       ; File not open
+        .byte  62, ENOENT       ; File not found
+        .byte  63, EEXIST       ; File exists
+        .byte  64, EINVAL       ; File type mismatch
+;       .byte  65,              ; No block
+;       .byte  66,              ; Illegal track or sector
+;       .byte  67,              ; Illegal system track or sector
+        .byte  70, EBUSY        ; No channel
+;       .byte  71,              ; Directory error
+;       .byte  72,              ; Disk full
+;       .byte  73,              ; DOS version mismatch
         .byte  74, ENODEV       ; Drive not ready
 
 ErrTabSize = (* - ErrTab)