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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4. #include <assert.h>
  5.  
  6. int get_byte(char b) {
  7.     if (b >= 'A' && b <='F')
  8.         return b - 'A' + 10;
  9.     else if (b >= '0' && b <='9') 
  10.         return b - '0';
  11.     return -1;
  12. }
  13.  
  14.  
  15. char* output_string(char *src) { // Assumes a nul terminated string    
  16.     int length = strlen(src);
  17.     assert(length % 2 == 0);
  18.     char *output = malloc(length/2 + 1);
  19.     char *to_ret = output;
  20.     assert(output != NULL);
  21.     while(*src) {
  22.         int nibble1 = get_byte(src[0]);
  23.         int nibble2 = get_byte(src[1]);
  24.  
  25.         assert(nibble1 != -1 && nibble2 != -1);
  26.         *output = (nibble1 << 4) | nibble2;
  27.         output++;
  28.         src+=2;  
  29.     }
  30.     *output = 0;
  31.     return to_ret; 
  32. }
  33.  
  34. int main(void) {
  35. 	char *output = output_string("E5A682E682A8");
  36. 	printf("%s", output);
  37. 	free(output);
  38. 	return 0;
  39. }
  40.  
Success #stdin #stdout 0s 4452KB
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如您
https://ideone.com/PqE5tt
language:
C99 (gcc 8.3)
created:
6 years ago
visibility:
public

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