format string c code example

Example 1: C printf to string

// int sprintf(char *str, const char *format, ...);
char *printf_to_string()
{
  char buffer[128] = {0} //Must be big enough

  // writing printf output in buffer
  sprintf(buffer, "some %s here...\n", "text");
  // duplicate if needed
  return strdup(buffer);
}

Example 2: c create formatted string

sprintf

// Allocates storage
char *hello_world = (char*)malloc(13 * sizeof(char));
// Prints "Hello world!" on hello_world
sprintf(hello_world, "%s %s!", "Hello", "world");

Credit: akappa