diff options
Diffstat (limited to 'c/libc.s')
| -rw-r--r-- | c/libc.s | 48 |
1 files changed, 48 insertions, 0 deletions
@@ -1,5 +1,6 @@ .module libc .globl _writes, _putc, _puts, _nl, _strlen, _readc, _sexit, _getpid, _getargs + .globl _open, _close, _fgetc, _fputc, _flist, _fremove ;; SDCC sm83 sdcccall(1): 1st arg -> A (byte) or DE (pointer); ret A / BC. ;; rst $30 (the trap) clobbers BC/DE/HL; SDCC treats them caller-saved, so ;; wrappers need not preserve them - but we compute cleanly regardless. @@ -84,3 +85,50 @@ _getpid: ld c, #8 ; SYS_GETPID rst #0x30 ret + + ;; unsigned char open(const char *name /*DE*/, unsigned char mode /*A*/) -> A(fd) +_open: + ld b, a ; B = mode + ld c, #4 ; SYS_OPEN + rst #0x30 + ret + + ;; void close(unsigned char fd /*A*/) +_close: + ld b, a + ld c, #5 ; SYS_CLOSE + rst #0x30 + ret + + ;; int fgetc(unsigned char fd /*A*/) -> BC (byte, or -1 at EOF) +_fgetc: + ld b, a + ld c, #12 ; SYS_GETB + rst #0x30 + jr c, 1$ + ld c, a + ld b, #0 + ret +1$: ld bc, #0xffff + ret + + ;; void fputc(unsigned char fd /*A*/, char ch /*E*/) + ;; byte goes to the kernel in E (the trap clobbers A during dispatch) +_fputc: + ld b, a ; B = fd (ch stays in E) + ld c, #13 ; SYS_PUTB + rst #0x30 + ret + + ;; unsigned char flist(unsigned char slot /*A*/, char *namebuf /*DE*/) -> A +_flist: + ld b, a + ld c, #14 ; SYS_LIST + rst #0x30 + ret + + ;; void fremove(const char *name /*DE*/) +_fremove: + ld c, #15 ; SYS_REMOVE + rst #0x30 + ret |