DouKaku? 3955 mtsuyugu: 出力のインデント処理と配列の長さを引数で...(BFコンパイラー)

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出力のインデント処理と配列の長さを引数で調整できるようにしてみました。
./bf2c hello.bf > hello.c
または
./bf2c hello.bf 128 > hello.c
のように使います。

#include <stdio.h>
#include <stdlib.h>

char *code[] = { "sp++;", "sp--;", "(*sp)++;", "(*sp)--;", "putchar(*sp);",
                 "*sp = getchar();", "while(*sp){", "}" };

int main( int argc, char *argv[] ){
   int c,i,j,n=0;
   int indent = 1;
   int length;
   FILE *fp;

   if( argc < 2 ){
      fprintf(stderr,"Usage: %s sourcefile\n", argv[0] );
      return EXIT_FAILURE;
   }
   if( (fp = fopen( argv[1], "r" )) == NULL ){
      fprintf(stderr,"Error: %s cannot opened\n", argv[1] );
      return EXIT_FAILURE;
   }
   if( !argv[2] || (length = atoi( argv[2] )) <= 0 ){
      length = 256;
   }

   puts("#include <stdio.h>");
   puts("#include <stdlib.h>");
   printf("#define DATA_LEN %d\n", length);
   puts("char code[DATA_LEN];");
   puts("int main (void){");
   puts("   char *sp = code;");
   while( (c=fgetc( fp )) != EOF ){
      switch(c){
      case '>': i = 0; break;
      case '<': i = 1; break;
      case '+': i = 2; break;
      case '-': i = 3; break;
      case '.': i = 4; break;
      case ',': i = 5; break;
      case '[': i = 6; indent++; break;
      case ']': i = 7; indent--; break;
      default:
         /* skip other characters */
         continue;
      }
      for( j = 0; j < (indent+(i==6?-1:0)); j++ ){
         printf("   ");
      }
      printf("%s\n", code[i] );
   }
   puts("   return EXIT_SUCCESS;");
   puts("}");
   fclose(fp);
   return EXIT_SUCCESS;
}

ケースが嫌いな私は、以下のように書き換えてしまいました。機能的には#3955と互換ですが、出力されたCコードのコンパイルには差し支えないのでインデントは省略しました。

Dan the Brainf.cker

#include <stdio.h>
#include <stdlib.h>

int main( int argc, char *argv[] ){
    int c;
    char *code[256];
    int length;
    FILE *fp;

    if( argc < 2 ){
        fprintf(stderr,"Usage: %s sourcefile\n", argv[0] );
        return EXIT_FAILURE;
    }
    if( (fp = fopen( argv[1], "r" )) == NULL ){
        fprintf(stderr,"Error: %s cannot opened\n", argv[1] );
        return EXIT_FAILURE;
    }
    if( !argv[2] || (length = atoi( argv[2] )) <= 0 ){
        length = 256;
    }

    for (c = 0; c < 256; c++) code[c] = NULL;
    code['>'] = "sp++;";
    code['<'] = "sp--;";
    code['+'] = "(*sp)++;";
    code['-'] = "(*sp)--;";
    code['.'] = "putchar(*sp);";
    code[','] = "*sp = getchar();";
    code['['] = "while(*sp){";
    code[']'] = "}";

    puts("#include <stdio.h>");
    puts("#include <stdlib.h>");
    printf("#define DATA_LEN %d\n", length);
    puts("char code[DATA_LEN];");
    puts("int main (void){");
    puts("   char *sp = code;");
    while( (c=fgetc( fp )) != EOF ) if (code[c]) printf("%s\n", code[c]); 
    puts("   return EXIT_SUCCESS;");
    puts("}");
    fclose(fp);
    return EXIT_SUCCESS;
}

DouKaku?

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