bf.c

   1 /* depend: */
   2 /* cflags: */
   3 /* linker: debug.o */
   4
   5 #include <errno.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 MAXJUMP 4
  18 #define MEMSIZE 10
  19
  20 /* type definition */
  21
  22 /* gobal variables */
  23
  24 char *progname = NULL;
  25 int p = 0;
  26 char mem[MEMSIZE] = {0};
  27 int j = 0;
  28 int jump[MAXJUMP] = {0};
  29
  30 /* help function */
  31
  32 int usage (int ret)
  33 {
  34     FILE *fd = ret ? stderr : stdout;
  35     fprintf (fd, "usage: %s [-i file] [-h] [-m memory] [-o file] [-v]\n", progname);
  36     fprintf (fd, " -i : input file\n");
  37     fprintf (fd, " -h : help message\n");
  38     fprintf (fd, " -m : memory [0..0]\n");
  39     fprintf (fd, " -o : output file\n");
  40     fprintf (fd, " -v : verbose level (%d)\n", verbose);
  41
  42     return ret;
  43 }
  44
  45 /* main process */
  46
  47 int process (char *buffer, int nb, FILE *out) {
  48     int i;
  49
  50     for (i = 0; i < nb; i++) {
  51         if (buffer[i] == 0) {
  52             break;
  53         }
  54
  55         VERBOSE (DEBUG, fprintf (stderr, "%s: p=%d, buffer='%s', memory=[ ", progname, p, buffer + i); int _i; for (_i = 0; _i < MEMSIZE; _i++) fprintf (stderr," %d", mem[_i]); fprintf (stderr," ]\n"));
  56
  57         switch (buffer[i]) {
  58             case '>': /* increase pointer */
  59                 p++;
  60                 break;
  61             case '<': /* decrease pointer */
  62                 p--;
  63                 break;
  64             case '+': /* increase pointer value */
  65                 if ((p >= 0) && (p < MEMSIZE)) {
  66                     mem[p]++;
  67                 } else {
  68                     VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
  69                     return 1;
  70                 }
  71                 break;
  72             case '-': /* decrease pointer value */
  73                 if ((p >= 0) && (p < MEMSIZE)) {
  74                     mem[p]--;
  75                 } else {
  76                     VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
  77                     return 1;
  78                 }
  79                 break;
  80             case '.': /* output pointer value */
  81                 if ((p >= 0) && (p < MEMSIZE)) {
  82                     fprintf (out, "%c", mem[p]);
  83                 } else {
  84                     VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
  85                     return 1;
  86                 }
  87                 break;
  88             case ',': /* read a byte and store it in memory */
  89                 if ((p >= 0) && (p < MEMSIZE)) {
  90                     int c = getchar ();
  91                     mem[p] = (c > 0) ? c : 0;
  92                 } else {
  93                     VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
  94                     return 1;
  95                 }
  96                 break;
  97             case '[': /* jump to right bracket if pointer is set to 0 */
  98                 if ((p < 0) || (p >= MEMSIZE)) {
  99                     VERBOSE (ERROR, fprintf (stderr, "%s: invalid address (%d)\n", progname, p));
 100                     return 1;
 101                 }
 102                 if (mem[p] == 0) {
 103                     int bracket = 1;
 104                     while ((++i < nb) && (bracket > 0)) {
 105                         bracket += (buffer[i] == '[') ? +1 : (buffer[i] == ']') ? -1 :0;
 106                     }
 107                     if (bracket) {
 108                         VERBOSE (ERROR, fprintf (stderr, "%s: brace not closed\n", progname));
 109                         return 1;
 110                     }
 111                     i--;
 112                 } else {
 113                     if (j >= MAXJUMP) {
 114                         VERBOSE (ERROR, fprintf (stderr, "%s: too many jump\n", progname));
 115                         return 1;
 116                     }
 117                     jump[j++] = i;
 118                 }
 119                 break;
 120             case ']': /* jump to left bracket if pointer is different to 0 */
 121                 if (j <= 0) {
 122                     VERBOSE (ERROR, fprintf (stderr, "%s: can't jump back\n", progname));
 123                     return 1;
 124                 }
 125                 i = jump[--j] - 1;
 126                 break;
 127             case ' ':
 128             case '\t':
 129             case '\n':
 130             case '\r':
 131                 break;
 132             default:
 133                 VERBOSE (WARNING, fprintf (stderr, "%s: can't understand '%c'\n", progname, buffer[i]));
 134         }
 135
 136         //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"));
 137
 138     }
 139
 140     return 0;
 141 }
 142
 143 /* main function */
 144
 145 int main (int argc, char *argv[])
 146 {
 147     char *input = NULL;
 148     char *output = NULL;
 149     char *buffer = NULL;
 150     int i;
 151     int n = 0;
 152     int size = 0;
 153     FILE *fid = NULL;
 154
 155     /* get basename */
 156     char *pt = progname = argv[0];
 157     while (*pt) {
 158         if ((*pt == '/') || (*pt == '\\')) {
 159            progname = pt + 1;
 160         }
 161         pt++;
 162     }
 163
 164     int c;
 165     while ((c = getopt(argc, argv, "e:i:m:o:hv:")) != EOF) {
 166         switch (c) {
 167         case 'e':
 168             if (buffer) {
 169                 free (buffer);
 170             }
 171             buffer = strdup (optarg);
 172             if (buffer == NULL) {
 173                 VERBOSE (ERROR, fprintf (stderr, "%s: can't allocate memory\n", progname));
 174                 return 1;
 175             }
 176             size = strlen (buffer) + 1;
 177             break;
 178         case 'i':
 179             input = optarg;
 180             break;
 181         case 'm':
 182             for (i = 0; i < MEMSIZE; i++) {
 183                 if (optarg) {
 184                     mem[i] = strtol (optarg, &optarg, 10);
 185                     VERBOSE (DEBUG, fprintf (stderr, "%s: mem[%d] = %d\n", progname, i, mem[i]));
 186                 }
 187             }
 188             if (*optarg != 0) {
 189                 VERBOSE (WARNING, fprintf (stderr, "%s: too many memory values or incorrect value\n", progname));
 190                 return 1;
 191             }
 192             break;
 193         case 'o':
 194             output = optarg;
 195             break;
 196         case 'v':
 197             verbose = atoi (optarg);
 198             break;
 199         case 'h':
 200         default:
 201             return usage (c != 'h');
 202         }
 203     }
 204     if (argc - optind != 0) {
 205         VERBOSE (ERROR, fprintf (stderr, "%s: invalid option -- %s\n", progname, argv[optind]));
 206         return usage (1);
 207     }
 208
 209     /* check input file */
 210     if (input) {
 211         fid = fopen (input, "r");
 212         if (fid == NULL) {
 213             VERBOSE (ERROR, fprintf (stderr, "%s: can't open file '%s' for reading\n", progname, input));
 214             return 1;
 215         }
 216     } else if (buffer == NULL) {
 217         fid = stdin;
 218     }
 219
 220     /* read input file */
 221     if (fid) {
 222         while (!feof (fid)) {
 223             buffer = (char *) realloc (buffer, size + BUFSIZE);
 224             if (buffer == NULL) {
 225                 VERBOSE (ERROR, fprintf (stderr, "%s: can't allocate memory\n", progname));
 226                 return 1;
 227             }
 228             memset (buffer + size, 0, BUFSIZE);
 229             n = fread (buffer + size, 1, BUFSIZE, fid);
 230             if (errno != 0) {
 231                 VERBOSE (ERROR, fprintf (stderr, "%s: can't read data from file '%s'\n", progname, input));
 232                 return 1;
 233             }
 234             size += BUFSIZE;
 235         }
 236
 237         /* close input file */
 238         if (fid != stdin) {
 239             fclose (fid);
 240         }
 241         VERBOSE (DEBUG, fprintf (stderr, "%s: read %d bytes\n", progname, size + n - BUFSIZE));
 242     } else {
 243         VERBOSE (DEBUG, fprintf (stderr, "%s: prog %d bytes\n", progname, size -1));
 244     }
 245
 246     /* check output file */
 247     if (output) {
 248         fid = fopen (output, "w");
 249         if (fid == NULL) {
 250             VERBOSE (ERROR, fprintf (stderr, "%s: can't open file '%s' for writing\n", progname, output));
 251             if (buffer) free (buffer);
 252             return 1;
 253         }
 254     } else {
 255         fid = stdout;
 256     }
 257
 258     /* main process */
 259     int rc = process (buffer, size, fid);
 260
 261     /* close output file */
 262     if (fid != stdout) {
 263         fclose (fid);
 264     }
 265
 266     /* free buffer */
 267     if (buffer) {
 268         free (buffer);
 269     }
 270
 271     VERBOSE (INFO, fprintf (stdout, "\nmemory:"); int _i; for (_i = 0; _i < MEMSIZE; _i++) fprintf (stdout," %d", mem[_i]); fprintf (stdout,"\n"));
 272
 273     return rc;
 274 }
 275
 276 // test: bf.exe -h
 277 // test: bf.exe -h | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
 278
 279 // test: bf.exe -_ 2> /dev/null | awk 'END { if (NR == 0) { exit(0) } else exit (1) }'
 280 // test: bf.exe -_ 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
 281 // test: bf.exe error 2>&1 | awk '/usage:/ { rc=1 } END { exit (1-rc) }'
 282
 283 // test: bf.exe -i error.b 2>&1 | grep "can't open" | grep -q "reading"
 284 // test: echo ">>." | bf.exe -o error/error.b 2>&1 | grep "can't open" | grep -q "writing"
 285 // test: echo "error" | bf.exe -v1 2>&1 | grep -q "can't understand"
 286 // test: echo "<+" | bf.exe -v1 2>&1 | grep -q "invalid address"
 287 // test: echo "<-" | bf.exe -v1 2>&1 | grep -q "invalid address"
 288 // test: echo "<." | bf.exe -v1 2>&1 | grep -q "invalid address"
 289 // test: echo "<," | bf.exe -v1 2>&1 | grep -q "invalid address"
 290 // test: echo "<[" | bf.exe -v1 2>&1 | grep -q "invalid address"
 291 // test: echo "[" | bf.exe -v1 2>&1 | grep -q "brace not closed"
 292 // test: echo "+[[[[[]]]]]" | bf.exe -v1 2>&1 | grep -q "too many jump"
 293 // test: bf.exe -m "0 1 2 3 4 5 6 7 8 9 10" -e '.' -v1 2>&1 | grep -q "too many memory values"
 294 // test: bf.exe -m "0 error" -e '.' -v1 2>&1 | grep -q "incorrect value"
 295 // test: echo "]" | bf.exe -v1 2>&1 | grep -q "can't jump back"
 296
 297 // test: echo '+++>++>>-<--' | bf.exe -v2 | grep -q "memory: 3 2 -2 -1 0"
 298 // test: bf.exe -e '+++' -e '+++>++>>-<--' -v2 | grep -q "memory: 3 2 -2 -1 0"
 299 // test: bf.exe -e '+++>++>>-<--' -v2 | grep -q "memory: 3 2 -2 -1 0"
 300 // test: bf.exe -m "51 50 49" -e '.>.>.' |grep -q "321"
 301 // test: bf.exe -m "51 50 49" -e '.>.>.' -o test.log && grep -q "321" test.log; rc=$?; rm test.log; test $rc -eq 0
 302 // test: echo '+++>++>>-<--' > test.b; bf.exe -i test.b | grep -q "memory: 3 2 -2 -1 0"; rc=$?; rm test.b; test $rc -eq 0
 303
 304 // test: echo '++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.' | bf.exe -v1 | grep -q "Hello World!"
 305 // test: echo '++++++++++[>+>+++>+++++++>++++++++++<<<<-]>>>++++++++++++++.>+++++++++++++++++.<<++.>+++++++++++++.>--.<<.>+++.+.--.>----.++++++.+.<++.>----.++.<<.>>+.-------.<<.>>++.<.>+++++.<<.>-.+.<.>---.>---.<-.++++++++.>----.<---.>+++++++.<---.++++++++.' | bf.exe -v1 | grep -q "Tu as decouvert un peu de brainfuck"
 306
 307 // test: echo -e "123\0" | bf.exe -e ',[>,]' -v2 | grep -q "memory: 49 50 51 0"
 308 // test: echo -e "4+3\0" | bf.exe -e ',>++++++[<-------->-],,[<+>-]<.' -v1 | grep -q 7
 309 // test: echo -e "1+7\0" | bf.exe -e ',>++++++[<-------->-],,[<+>-]<.' -v1 | grep -q 8
 310 // test: echo -e "3*2\0" | bf.exe -e ',>,,>++++++++[<------<------>>-]<<[>[>+>+<<-]>>[<<+>>-]<<<-]>>>++++++[<++++++++>-]<.' -v1 | grep -q 6
 311 // test: echo -e "1*7\0" | bf.exe -e ',>,,>++++++++[<------<------>>-]<<[>[>+>+<<-]>>[<<+>>-]<<<-]>>>++++++[<++++++++>-]<.' -v1 | grep -q 7
 312
 313 /* vim: set ts=4 sw=4 et: */