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3122
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1 #include <stdio.h>
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2 #include <unistd.h>
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3 #define c g->code
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4 #define p g->pointer
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5 #define f g->file
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6 #define b g->bit
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7
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8 struct Data {
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9 const char *code;
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10 char vars[30000];
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11 char *pointer;
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12 char bit;
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13 FILE *file;
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14 };
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15
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16 void lexer(struct Data *g) {
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17 const char *cc = c;
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18 while(*c)
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19 switch (*c++) {
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20 case '>':
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21 ++p;
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22 break;
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23
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24 case '<':
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25 --p;
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26 break;
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27
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28 case '+':
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29 ++*p;
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30 break;
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31
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32 case '-':
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33 --*p;
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34 break;
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35
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36 case '.':
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37 putchar(*p);
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38 break;
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39
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40 case ',':
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41 *p = getchar();
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42 break;
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43
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44 case '[':
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45 cc = c;
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46 if(!*p) while(*c++ != ']');
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47 while(*p) {
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48 c = cc; // restore char position to start of loop
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49 lexer(g);
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50 }
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51 break;
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52
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53 case ']':
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54 return;
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55
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56 case ':':
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57 printf("%hhd", *p);
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58 break;
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59
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60 case ';':
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61 scanf("%hhd", p);
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62 break;
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63
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64 case '#':
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65 // open in read mode unless the cell is 1
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66 if(f) fclose(f);
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67 f = fopen(p + 1, *p == 1 ? "w" : "r");
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68 break;
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69
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70 case '`':
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71 *p = fgetc(f);
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72 break;
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73
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74 case '!':
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75 fputc(*p, f);
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76 break;
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77
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78 case '\'':
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79 *p ^= (1 << b);
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80 b <= 0 ? b = 7 : b--;
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81 break;
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82
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83 case '"':
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84 b <= 0 ? b = 7 : b--;
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85 break;
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86
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87 case '\\':
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88 while(*c++ != '\n');
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89 break;
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90
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91 case '@':
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92 printf("%hhd : %hhd : %hhd : %hhd : %hhd", *(p - 2), *(p - 1), *p, *(p + 1), *(p + 2));
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93 break;
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94
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95 case '$':
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96 sleep(*p);
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97 break;
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98
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99 default:
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100 // everything else is comments
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101 break;
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102 }
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103 }
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104 /*
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105 * Usage:
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106 * struct Data g;
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107 * g.code = "code here";
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108 * g.bit = 7;
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109 * g.pointer = &g.data[15000];
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110 * lexer(&g);
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111 */
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