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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <errno.h>
  4.  
  5. typedef struct my_struct {
  6.     int *x;
  7.     float *y;
  8.     long int *z;
  9. } my_struct;
  10.  
  11. void destroy(my_struct *s);
  12.  
  13. int init(my_struct **ms)
  14. {
  15. 	my_struct *s = NULL;
  16. 	do{
  17. 	    s= (my_struct *) malloc(sizeof(my_struct));
  18. 	    if (s == NULL) {
  19. 	        printf("alloc my_struct fail\n");
  20. 	        break;
  21. 	    }
  22.  
  23. 	    s->x = (int *) malloc(sizeof(int));
  24. 	    if (s->x == NULL) {
  25. 	        printf("alloc x fail\n");
  26. 	        break;
  27. 	    }
  28.  
  29. 	    s->y = (float *) malloc(sizeof(float));
  30. 	    if (s->y == NULL) {
  31. 	        printf("alloc y fail\n");
  32. 	        break;
  33. 	    }
  34.  
  35. 	    s->z = (long int*) malloc(sizeof(long int));
  36. 	    if (s->z == NULL) {
  37. 	        printf("alloc z fail\n");
  38. 	        break;
  39. 	    }
  40. 	    *ms = s;
  41. 		return 0;// success init		
  42. 	}while(0);
  43.  
  44.  
  45. 	//something wrong
  46. 	destroy(s);
  47. 	*ms = NULL;
  48.     return -ENOMEM; 
  49.  
  50. }
  51.  
  52. void destroy(my_struct *s)
  53. {
  54. 	if(s == NULL){
  55. 		return;
  56. 	}
  57.  
  58.     if (s->x != NULL) {
  59.         free(s->x);
  60.     }
  61.  
  62.     if (s->y != NULL) {
  63.         free(s->y);
  64.     }
  65.  
  66.     if (s->z != NULL) {
  67.         free(s->z);
  68.     }
  69.  
  70.     free(s);
  71. }
  72.  
  73. int main(int argc, const char *argv[])
  74. {
  75.     my_struct *s = NULL;
  76.     if (init(&s)) {
  77.         printf("Init my_struct failed\n");
  78.         return -ENOMEM;
  79.     }
  80.  
  81.     // use my_struct here ...
  82.  
  83.     destroy(s);
  84.  
  85.     return 0;
  86. }
Success #stdin #stdout 0s 2180KB
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stdout 
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https://ideone.com/rj1Nph
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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