| 1 | /* depend: */ |
| 2 | /* cflags: */ |
| 3 | /* linker: debug.o */ |
| 4 | |
| 5 | #include <assert.h> |
| 6 | #include <getopt.h> |
| 7 | #include <malloc.h> |
| 8 | #include <stdio.h> |
| 9 | #include <stdlib.h> |
| 10 | #include <string.h> |
| 11 | |
| 12 | #include "debug.h" |
| 13 | |
| 14 | /* macros */ |
| 15 | |
| 16 | #define BUFSIZE 256 |
| 17 | #define MEMSIZE 8 |
| 18 | |
| 19 | /* type definition */ |
| 20 | |
| 21 | /* gobal variables */ |
| 22 | |
| 23 | char *progname = NULL; |
| 24 | int p = 0; |
| 25 | char mem[MEMSIZE] = {0}; |
| 26 | |
| 27 | /* help function */ |
| 28 | |
| 29 | int usage (int ret) |
| 30 | { |
| 31 | FILE *fd = ret ? stderr : stdout; |
| 32 | fprintf (fd, "usage: %s [-i file] [-h] [-m memory] [-o file] [-v]\n", progname); |
| 33 | fprintf (fd, " -i : input file\n"); |
| 34 | fprintf (fd, " -h : help message\n"); |
| 35 | fprintf (fd, " -m : memory [0..0]\n"); |
| 36 | fprintf (fd, " -o : output file\n"); |
| 37 | fprintf (fd, " -v : verbose level (%d)\n", verbose); |
| 38 | |
| 39 | return ret; |
| 40 | } |
| 41 | |
| 42 | /* main process */ |
| 43 | |
| 44 | int process (char *buffer, int nb, FILE *out) { |
| 45 | int i; |
| 46 | |
| 47 | for (i = 0; (i < nb) && (buffer[i] != 0); i++) { |
| 48 | |
| 49 | VERBOSE (DEBUG, fprintf (stderr, "%s: read '%c' (%u)\n", progname, buffer[i], buffer[i])); |
| 50 | switch (buffer[i]) { |
| 51 | case '>': /* increase pointer */ |
| 52 | p++; |
| 53 | break; |
| 54 | case '<': /* decrease pointer */ |
| 55 | p--; |
| 56 | break; |
| 57 | case '+': /* increase pointer value */ |
| 58 | if ((p >= 0) && (p < MEMSIZE)) { |
| 59 | mem[p]++; |
| 60 | } else { |
| 61 | VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p)); |
| 62 | return 1; |
| 63 | } |
| 64 | break; |
| 65 | case '-': /* decrease pointer value */ |
| 66 | if ((p >= 0) && (p < MEMSIZE)) { |
| 67 | mem[p]--; |
| 68 | } else { |
| 69 | VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p)); |
| 70 | return 1; |
| 71 | } |
| 72 | break; |
| 73 | case '.': /* output pointer value */ |
| 74 | if ((p >= 0) && (p < MEMSIZE)) { |
| 75 | fprintf (out, "%c", mem[p]); |
| 76 | } else { |
| 77 | VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p)); |
| 78 | return 1; |
| 79 | } |
| 80 | break; |
| 81 | case ',': /* read a byte and store it in memory */ |
| 82 | if ((p >= 0) && (p < MEMSIZE)) { |
| 83 | mem[p] = buffer[++i]; |
| 84 | } else { |
| 85 | VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p)); |
| 86 | return 1; |
| 87 | } |
| 88 | break; |
| 89 | case '[': /* jump to right bracket if pointer is set to 0 */ |
| 90 | if (mem[p] == 0) { |
| 91 | int bracket = 1; |
| 92 | while ((++i < nb) && (bracket > 0)) { |
| 93 | bracket += (buffer[i] == '[') ? +1 : (buffer[i] == ']') ? -1 :0; |
| 94 | } |
| 95 | if (bracket) { |
| 96 | VERBOSE (ERROR, fprintf (stderr, "%s: brace not closed\n", progname)); |
| 97 | return 1; |
| 98 | } |
| 99 | } else { |
| 100 | return process (buffer + i + 1, nb - i - 1, out); |
| 101 | } |
| 102 | break; |
| 103 | case ']': /* jump to left bracket if pointer is different to 0 */ |
| 104 | if (mem[p] != 0) { |
| 105 | i = -1; |
| 106 | } |
| 107 | break; |
| 108 | case '\n': |
| 109 | case '\r': |
| 110 | break; |
| 111 | default: |
| 112 | VERBOSE (WARNING, fprintf (stderr, "%s: can't understand '%c'\n", progname, buffer[i])); |
| 113 | } |
| 114 | |
| 115 | //VERBOSE (DEBUG, int _i; fprintf (stderr, "%s: p: %d mem:", progname, p); for (_i = 0; _i < MEMSIZE; _i++) fprintf (stderr, " %d", mem[_i]); fprintf (stderr, "\n")); |
| 116 | |
| 117 | } |
| 118 | |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | /* main function */ |
| 123 | |
| 124 | int main (int argc, char *argv[]) |
| 125 | { |
| 126 | char *input = NULL; |
| 127 | char *output = NULL; |
| 128 | char *buffer = NULL; |
| 129 | int i; |
| 130 | int n = 0; |
| 131 | int size = 0; |
| 132 | FILE *fid = NULL; |
| 133 | |
| 134 | /* get basename */ |
| 135 | char *pt = progname = argv[0]; |
| 136 | while (*pt) { |
| 137 | if ((*pt == '/') || (*pt == '\\')) { |
| 138 | progname = pt + 1; |
| 139 | } |
| 140 | pt++; |
| 141 | } |
| 142 | |
| 143 | int c; |
| 144 | while ((c = getopt(argc, argv, "i:m:o:hv:")) != EOF) { |
| 145 | switch (c) { |
| 146 | case 'i': |
| 147 | input = optarg; |
| 148 | break; |
| 149 | case 'm': |
| 150 | for (i = 0; i < MEMSIZE; i++) { |
| 151 | if (optarg) { |
| 152 | mem[i] = strtol (optarg, &optarg, 10); |
| 153 | VERBOSE (DEBUG, fprintf (stderr, "%s: mem[%d] = %d\n", progname, i, mem[i])); |
| 154 | } |
| 155 | } |
| 156 | if (*optarg != 0) { |
| 157 | VERBOSE (WARNING, fprintf (stderr, "%s: too many memory values\n", progname)); |
| 158 | return 1; |
| 159 | } |
| 160 | break; |
| 161 | case 'o': |
| 162 | output = optarg; |
| 163 | break; |
| 164 | case 'v': |
| 165 | verbose = atoi (optarg); |
| 166 | break; |
| 167 | case 'h': |
| 168 | default: |
| 169 | return usage (c != 'h'); |
| 170 | } |
| 171 | } |
| 172 | if (argc - optind != 0) { |
| 173 | VERBOSE (ERROR, fprintf (stderr, "%s: invalid option -- %s\n", progname, argv[optind])); |
| 174 | return usage (1); |
| 175 | } |
| 176 | |
| 177 | /* check input file */ |
| 178 | if (input) { |
| 179 | fid = fopen (input, "r"); |
| 180 | if (fid == NULL) { |
| 181 | VERBOSE (ERROR, fprintf (stderr, "%s: can't open file '%s' for reading\n", progname, input)); |
| 182 | return 1; |
| 183 | } |
| 184 | } else { |
| 185 | fid = stdin; |
| 186 | } |
| 187 | |
| 188 | /* read input file */ |
| 189 | while (!feof (fid)) { |
| 190 | buffer = (char *) realloc (buffer, size + BUFSIZE); |
| 191 | if (buffer == NULL) { |
| 192 | VERBOSE (ERROR, fprintf (stderr, "%s: can't allocate memory\n", progname)); |
| 193 | return 1; |
| 194 | } |
| 195 | memset (buffer + size, 0, BUFSIZE); |
| 196 | n = fread (buffer + size, 1, BUFSIZE, fid); |
| 197 | if (errno != 0) { |
| 198 | VERBOSE (ERROR, fprintf (stderr, "%s: can't read data from file '%s'\n", progname, input)); |
| 199 | return 1; |
| 200 | } |
| 201 | size += BUFSIZE; |
| 202 | } |
| 203 | |
| 204 | /* close input file */ |
| 205 | fclose (fid); |
| 206 | VERBOSE (DEBUG, fprintf (stderr, "%s: read %d bytes\n", progname, size + n - BUFSIZE)); |
| 207 | |
| 208 | /* check output file */ |
| 209 | if (output) { |
| 210 | fid = fopen (output, "w"); |
| 211 | if (fid == NULL) { |
| 212 | VERBOSE (ERROR, fprintf (stderr, "%s: can't open file '%s' for writing\n", progname, output)); |
| 213 | return 1; |
| 214 | } |
| 215 | } else { |
| 216 | fid = stdout; |
| 217 | } |
| 218 | |
| 219 | /* main process */ |
| 220 | int rc = process (buffer, size, fid); |
| 221 | VERBOSE (INFO, fprintf (stdout, "\nmemory:"); int _i; for (_i = 0; _i < MEMSIZE; _i++) fprintf (stdout," %d", mem[_i]); fprintf (stdout,"\n")); |
| 222 | |
| 223 | /* close output file */ |
| 224 | fclose (fid); |
| 225 | |
| 226 | return rc; |
| 227 | } |
| 228 | |
| 229 | // test: bf.exe -h |
| 230 | // test: bf.exe -h | awk '/usage:/ { rc=1 } END { exit (1-rc) }' |
| 231 | // test: bf.exe -_ 2> /dev/null | awk 'END { if (NR == 0) { exit(0) } else exit (1) }' |
| 232 | // test: bf.exe -_ 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }' |
| 233 | // test: echo '++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.' | bf.exe -v1 | grep -q "Hello World!" |
| 234 | // test: echo '++++++++++[>+>+++>+++++++>++++++++++<<<<-]>>>++++++++++++++.>+++++++++++++++++.<<++.>+++++++++++++.>--.<<.>+++.+.--.>----.++++++.+.<++.>----.++.<<.>>+.-------.<<.>>++.<.>+++++.<<.>-.+.<.>---.>---.<-.++++++++.>----.<---.>+++++++.<---.++++++++.' | bf.exe -v1 | grep -q "Tu as decouvert un peu de brainfuck" |
| 235 | // test: echo ',4>++++++[<-------->-],3[<+>-]<.' | bf.exe -v1 | grep -q 7 |
| 236 | |
| 237 | // test: echo ',3>,2>>++++++++++++++++[-<+++<---<--->>>]<<[<[>>+>+<<<-]>>>[<<<+>>>-]<<-]>.' | bf.exe -v1 | grep -q 6 |
| 238 | // test: echo ',3>,2[->>+<<]+<[->>>[>>>>>+<<<<<->+<<]<[>]>>>>>[-<<->>>>>>>]<[>]<<<<<<]>[>>>>->]<<<<<<[-]>[-]>>[-]>.' | bf.exe -v1 | grep -q 3 |
| 239 | |
| 240 | /* vim: set ts=4 sw=4 et: */ |