| 1 | // (c) 2020 Aaron Taylor <ataylor at subgeniuskitty dot com> |
| 2 | // See License.txt file for copyright and license details. |
| 3 | |
| 4 | #include <stdarg.h> |
| 5 | #include <stdint.h> |
| 6 | #include "pdp11.h" |
| 7 | |
| 8 | /* |
| 9 | * Polled console I/O |
| 10 | */ |
| 11 | |
| 12 | void |
| 13 | putch(uint16_t c) |
| 14 | { |
| 15 | while(!(GET(CONSXCSR,SLUXCSR_XMTRDY))) continue; |
| 16 | CONSXBUF = c; |
| 17 | } |
| 18 | |
| 19 | uint16_t |
| 20 | getch(void) |
| 21 | { |
| 22 | while(!(GET(CONSRCSR,SLURCSR_RCVRDY))) continue; |
| 23 | return CONSRBUF; |
| 24 | } |
| 25 | |
| 26 | |
| 27 | /* |
| 28 | * Helper functions for use with console IO |
| 29 | */ |
| 30 | |
| 31 | void |
| 32 | print_string(const char * string) |
| 33 | { |
| 34 | while (*string != '\0') { |
| 35 | putch(*string); |
| 36 | string++; |
| 37 | } |
| 38 | } |
| 39 | |
| 40 | char |
| 41 | digit_to_ascii(uint16_t digit) |
| 42 | { |
| 43 | if (digit > 15) { |
| 44 | print_string("ERROR: Out of range in digit_to_ascii()\r\n"); |
| 45 | // TODO: How do I want to handle runtime errors? |
| 46 | return 0; |
| 47 | } else if (digit > 9) { |
| 48 | digit -= 10; |
| 49 | digit += 'a'; |
| 50 | return digit; |
| 51 | } else { |
| 52 | digit += '0'; |
| 53 | return digit; |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | void |
| 58 | print_uint16_in_octal(uint16_t number) |
| 59 | { |
| 60 | char output[7]; // +6 for digits; +1 for null-term |
| 61 | for (int i = 5; i >= 0; i--) { |
| 62 | output[i] = digit_to_ascii(number % 8); |
| 63 | number = number / 8; |
| 64 | } |
| 65 | output[6] = '\0'; |
| 66 | putch('0'); |
| 67 | print_string(output); |
| 68 | } |
| 69 | |
| 70 | void |
| 71 | printf(const char * format, ...) |
| 72 | { |
| 73 | va_list ap; |
| 74 | va_start(ap, format); |
| 75 | while (*format) { |
| 76 | switch (*format) { |
| 77 | case '%': |
| 78 | format++; |
| 79 | switch (*format) { |
| 80 | case 's': |
| 81 | { |
| 82 | char * s = va_arg(ap, char *); |
| 83 | print_string(s); |
| 84 | break; |
| 85 | } |
| 86 | case 'o': |
| 87 | { |
| 88 | uint16_t u = va_arg(ap, unsigned int); |
| 89 | print_uint16_in_octal(u); |
| 90 | break; |
| 91 | } |
| 92 | default: |
| 93 | /* Put it back and look innocent. */ |
| 94 | putch('%'); |
| 95 | putch(*format); |
| 96 | break; |
| 97 | } |
| 98 | break; |
| 99 | case '\\': |
| 100 | format++; |
| 101 | switch (*format) { |
| 102 | case 'n': |
| 103 | print_string("\r\n"); |
| 104 | break; |
| 105 | case 't': |
| 106 | putch('\t'); |
| 107 | break; |
| 108 | case '%': |
| 109 | putch('%'); |
| 110 | break; |
| 111 | case '\\': |
| 112 | putch('\\'); |
| 113 | break; |
| 114 | default: |
| 115 | /* Maybe this escape wasn't meant for us. */ |
| 116 | putch('\\'); |
| 117 | putch(*format); |
| 118 | break; |
| 119 | } |
| 120 | break; |
| 121 | case '\n': |
| 122 | print_string("\r\n"); |
| 123 | break; |
| 124 | default: |
| 125 | putch(*format); |
| 126 | break; |
| 127 | } |
| 128 | format++; |
| 129 | } |
| 130 | va_end(ap); |
| 131 | } |
| 132 | |