How can I view the statements inside a scanf() function?

Question

Can we realloc a string inside a structure?

struct info
{
     char name[20];
     int age;
     char address[20];
}; 

struct info d[10];

I want to realloc name, how can I do it?

Answer 1

Hi Prajwal see this header file stdio.h at C:\Program Files (x86)\CodeBlocks\MinGW\include and after removing the preprocessors,you will find scanf() function with its statement like below :

 int scanf(const char *fmt, ...) {
  int rc;
  va_list args;

  va_start(args, fmt);

  rc = _input(stdin, fmt, args);

  return rc;
}

here it also includes stdarg.h and stddef.h where these functions used inside scanf() are defined.

Answer 2

scanf() function definition is inside scanf.c
scanf.c - sanos source
stdio.h contains only the function declarations
stdio.h - sanos source

Comments

@Rajat what is sanos source ? and where to search for scanf.c in our system?