diff options
| -rw-r--r-- | README | 6 | ||||
| -rw-r--r-- | brainfuck.c | 88 |
2 files changed, 70 insertions, 24 deletions
@@ -1,5 +1,5 @@ ./brainfuck: Brainfuck programming language interpreter -See http://en.wikipedia.org/wiki/Brainfuck for more details +See <http://en.wikipedia.org/wiki/Brainfuck> for more details Usage: ./brainfuck [options] [file] @@ -9,12 +9,13 @@ All data cells are zeros initially Options (defaults are in brackets): -s num stack size (128) -d num data size (30000) + -t trace execution for debug Formats for operators '.' and ',' (output and input): -c, -i, -u, -o, -x char, signed int, unsigned int, octal, hexadecimal octal number must be prepended by '0' (zero), and hexadecimal - by '0x' -Default i/o format: -i +Default i/o format -u -h this help message @@ -31,3 +32,4 @@ Example: echo '+++[.-]' | ./brainfuck # count down from 3 to 1 echo ',+++.;5' | ./brainfuck # shows 8 echo ',>,<[->+<]>.;4 5' | ./brainfuck # shows 4+5=9 + echo 'c,u.;h' | ./brainfuck # shows 104 (ASCII code for 'h') diff --git a/brainfuck.c b/brainfuck.c index c63f076..8e78adf 100644 --- a/brainfuck.c +++ b/brainfuck.c @@ -19,10 +19,13 @@ unsigned int * stack = NULL; unsigned int data_size = 30000; unsigned int stack_size = 128; -char format = 'i'; +char fmt = 'u'; +char format [9] = "%u"; +int trace = 0; unsigned int cp = 0; unsigned int dp = 0; +unsigned int max_dp = 0; unsigned int sp = 0; char ignore [] = "\t\r\n "; @@ -80,6 +83,7 @@ int inc_dp() if (dp < data_size) { ++dp; + if (dp > max_dp) max_dp = dp; return 1; } else @@ -130,36 +134,57 @@ int skip() } -void print() +void input() { - switch (format) + switch (fmt) { - case 'i': printf("%i\n", data[dp]); break; - case 'u': printf("%u\n", data[dp]); break; - case 'c': printf("%c", data[dp]); break; - case 'o': printf("0%o\n", data[dp]); break; - case 'x': printf("0x%X\n", data[dp]); break; + case 'i': scanf("%i", (signed int*) &(data[dp])); break; + case 'u': scanf("%u", (unsigned int*) &(data[dp])); break; + case 'c': scanf("%c", (char*) &(data[dp])); break; + case 'o': scanf("0%o", (unsigned int*) &(data[dp])); break; + case 'x': scanf("0x%X", (unsigned int*) &(data[dp])); break; } } -void input() +void print_data() { - switch (format) + unsigned int i; + for (i = 0; i < dp; i++) + { + fprintf(stderr, " "); + fprintf(stderr, format, data[i]); + } + + fprintf(stderr, " ["); + fprintf(stderr, format, data[dp]); + fprintf(stderr, "]"); + + for (i = dp+1; i <= max_dp; i++) { - case 'i': scanf("%i\n", (signed int*) &(data[dp])); break; - case 'u': scanf("%u\n", (unsigned int*) &(data[dp])); break; - case 'c': scanf("%c", (char*) &(data[dp])); break; - case 'o': scanf("0%o\n", (unsigned int*) &(data[dp])); break; - case 'x': scanf("0x%X\n", (unsigned int*) &(data[dp])); break; + fprintf(stderr, " "); + fprintf(stderr, format, data[i]); + } + fprintf(stderr, "\n"); +} + +void switch_format() +{ + switch (fmt) + { + case 'i': sprintf(format, "%%%c", fmt); break; + case 'u': sprintf(format, "%%%c", fmt); break; + case 'c': sprintf(format, "%%%c", fmt); break; + case 'o': sprintf(format, "0%%%c", fmt); break; + case 'x': sprintf(format, "0x%%%c", fmt); break; } } void run_code() { char cmd; + while ('\0' != (cmd = code[cp])) { - /* fprintf(stderr, "%c", cmd); */ switch (cmd) { case '[': if (data[dp]) @@ -176,7 +201,12 @@ void run_code() case '-': --(data[dp]); ++cp; break; case '>': inc_dp(); ++cp; break; case '<': dec_dp(); ++cp; break; - case '.': print(); ++cp; break; + case '.': if (!trace) + { + printf(format, data[dp]); + } + ++cp; + break; case ',': input(); ++cp; break; case 'i': @@ -184,9 +214,17 @@ void run_code() case 'c': case 'o': case 'x': - format = cmd; ++cp; break; + fmt = cmd; + switch_format(); + ++cp; + break; default: ++cp; } + if (trace) + { + fprintf(stderr, "%c:", cmd); + print_data(); + } } } @@ -200,7 +238,7 @@ void free_all() void usage(char * self) { printf("%s: Brainfuck programming language interpreter\n", self); - printf("See http://en.wikipedia.org/wiki/Brainfuck for more details\n\n"); + printf("See <http://en.wikipedia.org/wiki/Brainfuck> for more details\n\n"); printf("Usage: %s [options] [file]\n\n", self); @@ -209,12 +247,13 @@ void usage(char * self) printf("Options (defaults are in brackets):\n"); printf(" -s num stack size (%u)\n", stack_size); printf(" -d num data size (%u)\n", data_size); + printf(" -t trace execution for debug\n"); printf("\n"); printf("Formats for operators '.' and ',' (output and input):\n"); printf(" -c, -i, -u, -o, -x char, signed int, unsigned int, octal, hexadecimal\n"); printf(" octal number must be prepended by '0' (zero),\n"); printf(" and hexadecimal - by '0x'\n"); - printf("Default i/o format: -%c\n", format); + printf("Default i/o format -%c\n", fmt); printf("\n"); printf(" -h this help message\n"); printf("\n"); @@ -231,6 +270,7 @@ void usage(char * self) printf(" echo '+++[.-]' | %s # count down from 3 to 1\n", self); printf(" echo ',+++.;5' | %s # shows 8\n", self); printf(" echo ',>,<[->+<]>.;4 5' | %s # shows 4+5=9\n", self); + printf(" echo 'c,u.;h' | %s # shows 104 (ASCII code for 'h')\n", self); exit(EXIT_SUCCESS); } @@ -241,7 +281,7 @@ int main(int argc, char ** argv) char * self = argv[0]; int opt; - while (-1 != (opt = getopt(argc, argv, "s:d:h?iucox"))) + while (-1 != (opt = getopt(argc, argv, "ts:d:h?iucox"))) { switch (opt) { @@ -251,12 +291,16 @@ int main(int argc, char ** argv) case 'd': sscanf(optarg, "%u", &data_size); break; + case 't': + trace = 1; + break; case 'i': case 'u': case 'c': case 'o': case 'x': - format = opt; + fmt = opt; + switch_format(); break; default: usage(self); } |