zasm: buffer stdin in emulator
Also, add a port for rewinding stdin.
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@ -18,24 +18,32 @@
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* I/O Ports:
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*
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* 0 - stdin / stdout
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* 1 - When written to, rewind stdin buffer to the beginning.
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*/
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// in sync with zasm_glue.asm
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#define USER_CODE 0x4800
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#define STDIO_PORT 0x00
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#define STDIN_REWIND 0x01
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// Other consts
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#define STDIN_BUFSIZE 0x8000
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static Z80Context cpu;
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static uint8_t mem[0xffff];
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static uint8_t mem[0x10000];
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// STDIN buffer, allows us to seek and tell
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static uint8_t inpt[STDIN_BUFSIZE];
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static int inpt_size;
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static int inpt_ptr;
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static uint8_t io_read(int unused, uint16_t addr)
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{
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addr &= 0xff;
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if (addr == STDIO_PORT) {
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int c = getchar();
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if (c == EOF) {
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if (inpt_ptr < inpt_size) {
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return inpt[inpt_ptr++];
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} else {
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return 0;
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}
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return c;
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} else {
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fprintf(stderr, "Out of bounds I/O read: %d\n", addr);
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return 0;
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@ -47,6 +55,8 @@ static void io_write(int unused, uint16_t addr, uint8_t val)
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addr &= 0xff;
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if (addr == STDIO_PORT) {
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putchar(val);
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} else if (addr == STDIN_REWIND) {
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inpt_ptr = 0;
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} else {
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fprintf(stderr, "Out of bounds I/O write: %d / %d\n", addr, val);
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}
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@ -71,6 +81,20 @@ int main()
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for (int i=0; i<sizeof(USERSPACE); i++) {
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mem[i+USER_CODE] = USERSPACE[i];
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}
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// read stdin in buffer
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inpt_size = 0;
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inpt_ptr = 0;
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int c = getchar();
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while (c != EOF) {
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inpt[inpt_ptr] = c & 0xff;
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inpt_ptr++;
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if (inpt_ptr == STDIN_BUFSIZE) {
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break;
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}
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c = getchar();
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}
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inpt_size = inpt_ptr;
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inpt_ptr = 0;
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Z80RESET(&cpu);
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cpu.ioRead = io_read;
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cpu.ioWrite = io_write;
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