| 1 | /* |
| 2 | * (c) 2019 Aaron Taylor <ataylor at subgeniuskitty dot com> |
| 3 | * All rights reserved. |
| 4 | */ |
| 5 | |
| 6 | #include <stdio.h> |
| 7 | #include <stdlib.h> |
| 8 | #include <unistd.h> |
| 9 | #include <string.h> |
| 10 | #include <errno.h> |
| 11 | #include <getopt.h> |
| 12 | #include <stdint.h> |
| 13 | |
| 14 | #define VERSION 1 |
| 15 | |
| 16 | void |
| 17 | print_usage(char ** argv) |
| 18 | { |
| 19 | printf( "VVhitespace Interpreter v%d (www.subgeniuskitty.com)\n" |
| 20 | "Usage: %s -i <file> -o <file>\n" |
| 21 | " -h Help (prints this message)\n" |
| 22 | " -i <file> Specify a pseudo-VVhitespace source file as input.\n" |
| 23 | " -o <file> Specify location for VVhitespace output.\n" |
| 24 | , VERSION, argv[0] |
| 25 | ); |
| 26 | } |
| 27 | |
| 28 | int |
| 29 | main(int argc, char ** argv) |
| 30 | { |
| 31 | /* |
| 32 | * Process command line arguments |
| 33 | */ |
| 34 | int c; |
| 35 | FILE * input = NULL, * output = NULL; |
| 36 | while ((c = getopt(argc,argv,"i:o:h")) != -1) { |
| 37 | switch (c) { |
| 38 | case 'i': |
| 39 | if ((input = fopen(optarg, "r")) == NULL) { |
| 40 | fprintf(stderr, "ERROR: %s: %s\n", optarg, strerror(errno)); |
| 41 | } |
| 42 | break; |
| 43 | case 'o': |
| 44 | if ((output = fopen(optarg, "w+")) == NULL) { |
| 45 | fprintf(stderr, "ERROR: %s: %s\n", optarg, strerror(errno)); |
| 46 | } |
| 47 | break; |
| 48 | case 'h': |
| 49 | print_usage(argv); |
| 50 | exit(EXIT_SUCCESS); |
| 51 | break; |
| 52 | default: |
| 53 | break; |
| 54 | } |
| 55 | } |
| 56 | if (input == NULL) { |
| 57 | fprintf(stderr, "ERROR: Must specify a pseudo-VVhitespace source file with -i flag.\n"); |
| 58 | print_usage(argv); |
| 59 | exit(EXIT_FAILURE); |
| 60 | } |
| 61 | if (output == NULL) { |
| 62 | fprintf(stderr, "ERROR: Must specify destination for VVhitespace source file with -o flag.\n"); |
| 63 | print_usage(argv); |
| 64 | exit(EXIT_FAILURE); |
| 65 | } |
| 66 | |
| 67 | /* |
| 68 | * Main Loop |
| 69 | */ |
| 70 | uint8_t temp_byte; |
| 71 | while (fread(&temp_byte, 1, 1, input)) { |
| 72 | switch (temp_byte) { |
| 73 | case 't': |
| 74 | case 'T': |
| 75 | temp_byte = '\t'; |
| 76 | fwrite(&temp_byte, 1, 1, output); |
| 77 | break; |
| 78 | case 's': |
| 79 | case 'S': |
| 80 | temp_byte = ' '; |
| 81 | fwrite(&temp_byte, 1, 1, output); |
| 82 | break; |
| 83 | case 'n': |
| 84 | case 'N': |
| 85 | temp_byte = '\n'; |
| 86 | fwrite(&temp_byte, 1, 1, output); |
| 87 | break; |
| 88 | case 'v': |
| 89 | case 'V': |
| 90 | temp_byte = '\v'; |
| 91 | fwrite(&temp_byte, 1, 1, output); |
| 92 | break; |
| 93 | case '\n': |
| 94 | /* Intentionally empty */ |
| 95 | break; |
| 96 | default: |
| 97 | /* The first non-[tTsSnNvV] character begins a comment lasting until end of line. */ |
| 98 | while (fread(&temp_byte, 1, 1, input)) { |
| 99 | if (temp_byte == '\n') break; |
| 100 | } |
| 101 | break; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * Cleanup and exit |
| 107 | */ |
| 108 | fclose(input); |
| 109 | fclose(output); |
| 110 | |
| 111 | printf("Successfully converted source code.\n"); |
| 112 | |
| 113 | exit(EXIT_SUCCESS); |
| 114 | } |