75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#define MEMORY_SIZE 30000
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int main(int argc, char *argv[])
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{
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int c = 0;
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argv++; // Program name
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while(--argc){
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const char *filename = *argv++;
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char *memory = calloc(1, MEMORY_SIZE), *pointer = memory;
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FILE *fd = fopen(filename, "r");
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assert(fd);
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fseek(fd, 0, SEEK_END);
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int file_size = ftell(fd);
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rewind(fd);
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char* file_pointer = malloc(file_size+1), *file_cnt = file_pointer;
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fread(file_pointer, 1, file_size, fd);
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file_cnt[file_size] = 0;
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fclose(fd);
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for(;*file_cnt != '\0'; file_cnt++){
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switch (*file_cnt) {
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case '>': // Increment the data pointer by one (to point to the next cell to the right).
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pointer++;
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break;
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case '<': // Decrement the data pointer by one (to point to the next cell to the left).
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pointer--;
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break;
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case '+': // Increment the byte at the data pointer by one.
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(*pointer)++;
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break;
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case '-': // Decrement the byte at the data pointer by one.
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(*pointer)--;
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break;
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case '.': // Output the byte at the data pointer.
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printf("%c", *pointer);
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break;
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case ',': // Accept one byte of input, storing its value in the byte at the data pointer.
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scanf("%c", pointer);
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break;
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case '[': // If the byte at the data pointer is zero, then instead of moving the instruction pointer forward to the next command, jump it forward to the command after the matching ] command.
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if(*pointer == 0)
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while(*++file_cnt != ']' || c != 0){
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if(*file_cnt == '[')
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c++;
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else if(*file_cnt == ']')
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c--;
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}
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break;
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case ']': // If the byte at the data pointer is nonzero, then instead of moving the instruction pointer forward to the next command, jump it back to the command after the matching [ command.
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if(*pointer != 0)
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while(*--file_cnt != '[' || c != 0){
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if(*file_cnt == ']')
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c++;
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else if(*file_cnt == '[')
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c--;
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}
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break;
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default:
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break;
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}
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}
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free(memory);
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free(file_pointer);
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}
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return 0;
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}
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