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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. typedef struct
  6. {
  7.     char* location;
  8.     int temp;
  9.     int numberOfRec;
  10. }TEMP;
  11.  
  12. // Your wrapper functions
  13. void *xCalloc(size_t numElements, size_t sizeofElement)
  14. {
  15.     return calloc(numElements, sizeofElement);
  16. }
  17.  
  18. void *xRealloc(void *ptr, size_t newSize)
  19. {
  20.     return realloc(ptr, newSize);
  21. }
  22.  
  23. void someFunction(TEMP* data)
  24. {
  25.     void *temp;
  26.     temp = xRealloc (data->location, 10 * sizeof(char));
  27.     if(temp == NULL)
  28.     {
  29.         // Ran out of memory
  30.         exit(EXIT_FAILURE);
  31.     }
  32.  
  33.     data->location = temp;
  34.     strncpy(data->location, "Hello", 6); // 6 = 5 + 1 (for NULL terminator)
  35. }
  36.  
  37. int main(void)
  38. {
  39.     TEMP* data = xCalloc (1, sizeof(TEMP));
  40.     data->location = xCalloc (20, sizeof(char));
  41.     printf("Before realloc: %d\n", strlen(data->location));
  42.     someFunction(data);
  43.     printf("After realloc: %d\n", strlen(data->location));
  44.  
  45.     if(data->location != NULL)
  46.         free(data->location);
  47.     if(data != NULL)
  48.         free(data);
  49.     return 0;
  50. }
Success #stdin #stdout 0s 1964KB
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stdin
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Standard input is empty
stdout
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Before realloc: 0
After realloc: 5
https://ideone.com/30i4Z4
language:
C99 (gcc 8.3)
created:
11 years ago
visibility:
public

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