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unbin.c (626B)

      1 #include <stdio.h>
      2 #include <stdlib.h>
      3 #include <string.h>
      4 #include <inttypes.h>
      5 
      6 #define BUFFER_SIZE 256
      7 
      8 static uintmax_t
      9 bin2int(char *str)
     10 {
     11 	uintmax_t f=1;
     12 	uintmax_t sum=0;
     13 	for (int i = strlen(str) - 1; i>=0; i--) {
     14 		if (str[i] == 'b') break;
     15 		sum = sum + f * (str[i] - '0');
     16 		f *= 2;
     17 	}
     18 	return sum;
     19 }
     20 
     21 int
     22 main(int argc, char **argv)
     23 {
     24 	if (argc == 2) {
     25 		uintmax_t n = bin2int(argv[1]);
     26 		printf("%"PRIuMAX"\n", n);
     27 		
     28 		return 0;
     29 	}
     30 
     31 	char buffer[BUFFER_SIZE];
     32 	while (fgets(buffer, sizeof(buffer), stdin)) {
     33 		strtok(buffer, "\n");
     34 		uintmax_t n = bin2int(buffer);
     35 		printf("%"PRIuMAX"\n", n);
     36 	}
     37 
     38 	return 0;
     39 }