bf.c

   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: */