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  1. #include <stdarg.h>
  2.  
  3. /* Some definitions and declaration to make the code work */
  4. #define IO 	    	01
  5. #define USART		02
  6. #define LCD		03
  7. #define set_portB   	1
  8.  
  9. struct __port__ { int set; };
  10. struct __io__ {
  11.     struct __port__ portB;
  12.     struct __port__ portC;
  13.     struct __port__ portD;
  14. };
  15. typedef struct __io__ io;
  16. typedef struct __io__ lcd;
  17. typedef struct __io__ usart;
  18.  
  19. void init_peripheral(int ID, ...) {
  20.     va_list device;
  21.     va_start(device, ID);
  22.     io* temp;
  23.     (*temp).portB.set = set_portB;  	// NOTE: dereferencing uninitialized pointer!
  24.  
  25.     if (ID == IO) {
  26.         io* config_io;
  27.         config_io = va_arg(device, io*);
  28.         // ...
  29.     } else if (ID == LCD) {
  30.         lcd *config_lcd;
  31.         config_lcd = va_arg(device, lcd*);
  32.         // ...
  33.     } else if (ID == USART) {
  34.         usart *config_usart;
  35.         config_usart = va_arg(device, usart*);
  36.         // ... 
  37.     }
  38.     va_end(device);
  39. }
  40.  
  41. int main() { return 0; }
Success #stdin #stdout 0.01s 1672KB
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https://ideone.com/dnRla
language:
C99 (gcc 8.3)
created:
13 years ago
visibility:
public

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