Execute Brain****/C: Difference between revisions
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{{implementation|Brainf***}}{{collection|RCBF}} |
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This is a simple function that will run Brain**** code. |
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The code can be fed from a file or anything else. Here it's entered directly (it reverses a string you type). |
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This Brain**** interpreter has an eight bit cell size with the tape length bounded only by available memory. The normal [http://esolangs.org/wiki/Brainfuck_bitwidth_conversions cell expansion techniques] work for brain**** programs that require a larger cell size (or you can just change the tape cell type). |
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<lang c>#include <stdio.h> |
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#include <string.h> |
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#include <stdlib.h> |
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It is a fairly slow interpreter which is probably able to run [http://esoteric.sange.fi/brainfuck/utils/mandelbrot/mandelbrot.b mandelbrot.b] in about a minute on your machine. |
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//Making it easier to understand. All for you guys <3 |
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enum retval_enum{INIT_ERROR_VALUES, INIT_ERROR_MEMORY, RUN_ERROR_BOUNDARIES, ENDLOOP_MISSING, STARTLOOP_MISSING, FINISHED}; |
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<syntaxhighlight lang="c">/* This is the Neutron brainfuck interpreter. |
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//The function to execute the Brainf*** code |
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* It's rather small and dense, but still readable, more or less. |
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enum retval_enum runCode(char *code, int cellnum); |
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* |
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* Robert de Bath -- 2013. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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struct bfi { char cmd; struct bfi *next, *jmp; }; |
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struct mem { char val; struct mem *next, *prev; }; |
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int main(int argc, char **argv) |
int main(int argc, char **argv) |
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{ |
{ |
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FILE * ifd; |
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printf("Running code\n\n"); |
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int ch; |
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struct bfi *p=0, *n=0, *j=0, *pgm = 0; |
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//Run some code to test. I think this is a Hello World program. The code can be read from a file or whatever else is wanted |
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struct mem *m = calloc(1,sizeof*m); |
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setbuf(stdout, NULL); |
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unsigned int stat = runCode(",----------[++++++++++>,----------]<[.<]+++++++++++++.---.", 1000); |
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printf("\n\nDone running code\n"); |
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switch(stat) |
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{ |
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case INIT_ERROR_VALUES: |
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printf("Error initializing values.\n"); |
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//Some jerk set the number of cells to 0 |
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break; |
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case INIT_ERROR_MEMORY: |
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printf("Not enough memory.\n"); |
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//Not enough memory to allocate an array of chars with length cellnum |
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break; |
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case RUN_ERROR_BOUNDARIES: |
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printf("Boundary error in BF prog\n"); |
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//Whilst running, the cell iterator got below 0 or over cellnum. ie. not enough cells |
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break; |
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case STARTLOOP_MISSING: |
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printf("Error in code. Start loop missing\n"); |
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//An endloop was found without a startloop |
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break; |
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case ENDLOOP_MISSING: |
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printf("Error in code. End loop missing\n"); |
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//A Startloop was found without an endloop |
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break; |
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case FINISHED: |
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printf("Finished with no problems\n"); |
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//Code finished without any probs |
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break; |
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}; |
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return 0; |
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} |
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enum retval_enum runCode(char *code, int cellnum) |
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{ |
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//Returns with enum on failure |
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if(cellnum==0) |
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return INIT_ERROR_VALUES; |
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//Allocate memory for cells |
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unsigned char *p_cells = 0; |
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p_cells = (unsigned char*) malloc(cellnum); |
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if(p_cells == 0) |
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return INIT_ERROR_MEMORY; |
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int cell_iter = 0; |
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int code_len = strlen(code); |
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int code_iter = 0; |
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//iter is changed according to code |
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while(code_iter < code_len) |
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{ |
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switch(code[code_iter]) |
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{ |
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case '+': |
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//Just increase. If it overflows, it'll become 0 |
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p_cells[cell_iter]++; |
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break; |
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case '-': |
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//"Underflowing" will cause it to be max(int) |
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p_cells[cell_iter]--; |
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break; |
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case '>': |
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//Move pointer and check boundaries |
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cell_iter++; |
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if(cell_iter == cellnum) |
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{ |
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free(p_cells); |
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return RUN_ERROR_BOUNDARIES; |
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} |
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break; |
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case '<': |
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//Move pointer and check boundaries |
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cell_iter--; |
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if(cell_iter<0) |
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{ |
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free(p_cells); |
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return RUN_ERROR_BOUNDARIES; |
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} |
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break; |
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/* Open the file from the command line or stdin */ |
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case '.': |
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if (argc < 2 || strcmp(argv[1], "-") == 0) ifd = stdin; |
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//Output current cell |
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else if ((ifd = fopen(argv[1], "r")) == 0) { perror(argv[1]); exit(1); } |
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printf("%c", p_cells[cell_iter]); |
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break; |
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/* |
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case ',': |
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* For each character, if it's a valid BF command add it onto the |
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//Grab 1 char input |
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* end of the program. If the input is stdin use the '!' character |
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p_cells[cell_iter]=getc(stdin); |
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* to mark the end of the program and the start of the data, but |
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break; |
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* only if we have a complete program. The 'j' variable points |
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* at the list of currently open '[' commands, one is matched off |
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* by each ']'. A ']' without a matching '[' is not a legal BF |
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* command and so is ignored. If there are any '[' commands left |
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* over at the end they are not valid BF commands and so are ignored. |
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*/ |
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while((ch = getc(ifd)) != EOF && (ifd!=stdin || ch != '!' || j || !pgm)) { |
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if (ch == '<' || ch == '>' || ch == '+' || ch == '-' || |
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ch == ',' || ch == '.' || ch == '[' || (ch == ']' && j)) { |
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if ((n = calloc(1, sizeof*n)) == 0) { |
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perror(argv[0]); exit(1); |
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} |
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if (p) p->next = n; else pgm = n; |
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n->cmd = ch; p = n; |
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if (n->cmd == '[') { n->jmp=j; j = n; } |
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else if (n->cmd == ']') { |
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n->jmp = j; j = j->jmp; n->jmp->jmp = n; |
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} |
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} |
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} |
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/* Ignore any left over '[' commands */ |
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case '[': |
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while(j) { p = j; j = j->jmp; p->jmp = 0; p->cmd = ' '; } |
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//If current cell is 0, run to the next ']' |
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if(p_cells[cell_iter]==0) |
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while(code[code_iter]!=']') |
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{ |
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code_iter++; |
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if(code_iter>=code_len) |
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{ |
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free(p_cells); |
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return ENDLOOP_MISSING; |
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} |
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} |
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break; |
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if (ifd!=stdin) fclose(ifd); |
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case ']': |
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//Run all the way back before the last '[' |
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while(code[code_iter]!='[') |
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{ |
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code_iter--; |
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if(code_iter<0) |
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{ |
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free(p_cells); |
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return STARTLOOP_MISSING; |
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} |
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} |
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code_iter--; |
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break; |
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/* Execute the loaded BF program */ |
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default: |
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for(n=pgm; n; n=n->next) |
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//It's not a relevant char, ignore it. |
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switch(n->cmd) |
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break; |
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{ |
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}; |
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case '+': m->val++; break; |
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code_iter++; |
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case '-': m->val--; break; |
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}; |
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case '.': putchar(m->val); break; |
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case ',': if((ch=getchar())!=EOF) m->val=ch; break; |
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case '[': if (m->val == 0) n=n->jmp; break; |
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case ']': if (m->val != 0) n=n->jmp; break; |
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case '<': |
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if (!(m=m->prev)) { |
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fprintf(stderr, "%s: Hit start of tape\n", argv[0]); |
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exit(1); |
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} |
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break; |
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case '>': |
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if (m->next == 0) { |
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if ((m->next = calloc(1,sizeof*m)) == 0) { |
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perror(argv[0]); exit(1); |
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} |
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m->next->prev = m; |
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} |
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m=m->next; |
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break; |
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} |
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return 0; |
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//Just clean up |
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}</syntaxhighlight> |
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free(p_cells); |
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This Brain**** interpreter is released into the Public domain or if your prefer the Creative commons CC0 license. |
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//We are done. Give an awesome goodness signal back! |
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return FINISHED; |
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} |
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</lang> |
Latest revision as of 11:05, 1 September 2022
Execute Brain****/C is an implementation of Brainf***.
Other implementations of Brainf***.
Execute Brain****/C is part of RCBF. You may find other members of RCBF at Category:RCBF.
This Brain**** interpreter has an eight bit cell size with the tape length bounded only by available memory. The normal cell expansion techniques work for brain**** programs that require a larger cell size (or you can just change the tape cell type).
It is a fairly slow interpreter which is probably able to run mandelbrot.b in about a minute on your machine.
/* This is the Neutron brainfuck interpreter.
* It's rather small and dense, but still readable, more or less.
*
* Robert de Bath -- 2013.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct bfi { char cmd; struct bfi *next, *jmp; };
struct mem { char val; struct mem *next, *prev; };
int main(int argc, char **argv)
{
FILE * ifd;
int ch;
struct bfi *p=0, *n=0, *j=0, *pgm = 0;
struct mem *m = calloc(1,sizeof*m);
setbuf(stdout, NULL);
/* Open the file from the command line or stdin */
if (argc < 2 || strcmp(argv[1], "-") == 0) ifd = stdin;
else if ((ifd = fopen(argv[1], "r")) == 0) { perror(argv[1]); exit(1); }
/*
* For each character, if it's a valid BF command add it onto the
* end of the program. If the input is stdin use the '!' character
* to mark the end of the program and the start of the data, but
* only if we have a complete program. The 'j' variable points
* at the list of currently open '[' commands, one is matched off
* by each ']'. A ']' without a matching '[' is not a legal BF
* command and so is ignored. If there are any '[' commands left
* over at the end they are not valid BF commands and so are ignored.
*/
while((ch = getc(ifd)) != EOF && (ifd!=stdin || ch != '!' || j || !pgm)) {
if (ch == '<' || ch == '>' || ch == '+' || ch == '-' ||
ch == ',' || ch == '.' || ch == '[' || (ch == ']' && j)) {
if ((n = calloc(1, sizeof*n)) == 0) {
perror(argv[0]); exit(1);
}
if (p) p->next = n; else pgm = n;
n->cmd = ch; p = n;
if (n->cmd == '[') { n->jmp=j; j = n; }
else if (n->cmd == ']') {
n->jmp = j; j = j->jmp; n->jmp->jmp = n;
}
}
}
/* Ignore any left over '[' commands */
while(j) { p = j; j = j->jmp; p->jmp = 0; p->cmd = ' '; }
if (ifd!=stdin) fclose(ifd);
/* Execute the loaded BF program */
for(n=pgm; n; n=n->next)
switch(n->cmd)
{
case '+': m->val++; break;
case '-': m->val--; break;
case '.': putchar(m->val); break;
case ',': if((ch=getchar())!=EOF) m->val=ch; break;
case '[': if (m->val == 0) n=n->jmp; break;
case ']': if (m->val != 0) n=n->jmp; break;
case '<':
if (!(m=m->prev)) {
fprintf(stderr, "%s: Hit start of tape\n", argv[0]);
exit(1);
}
break;
case '>':
if (m->next == 0) {
if ((m->next = calloc(1,sizeof*m)) == 0) {
perror(argv[0]); exit(1);
}
m->next->prev = m;
}
m=m->next;
break;
}
return 0;
}
This Brain**** interpreter is released into the Public domain or if your prefer the Creative commons CC0 license.