diff options
Diffstat (limited to 'c/libc.s')
| -rw-r--r-- | c/libc.s | 19 |
1 files changed, 18 insertions, 1 deletions
@@ -1,6 +1,6 @@ .module libc .globl _writes, _putc, _puts, _nl, _strlen, _readc, _sexit, _getpid, _getargs - .globl _open, _close, _fgetc, _fputc, _flist, _fremove, _pipe, _ssend, _srecv + .globl _open, _close, _fgetc, _fputc, _flist, _fremove, _pipe, _ssend, _srecv, _srecv_nb, _pollin ;; SDCC sm83 sdcccall(1): 1st arg -> A (byte) or DE (pointer); ret A / BC. ;; rst $30 (the trap) clobbers BC/DE/HL; SDCC treats them caller-saved, so ;; wrappers need not preserve them - but we compute cleanly regardless. @@ -105,6 +105,23 @@ _srecv: rst #0x30 ret + ;; int srecv_nb(void) -> byte, or -1 if none (non-blocking) +_srecv_nb: + ld c, #31 ; SYS_SRECVNB + rst #0x30 + jr c, 1$ + ld c, a + ld b, #0 + ret +1$: ld bc, #0xffff + ret + + ;; unsigned char pollin(void) -> A (typed OSK char, or 0) +_pollin: + ld c, #32 ; SYS_POLLIN + rst #0x30 + ret + ;; unsigned char open(const char *name /*DE*/, unsigned char mode /*A*/) -> A(fd) _open: ld b, a ; B = mode |