text: /*
   * vasprintf.c
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <stdarg.h>
  
  int vasprintf(char **bufp, const char *format, va_list ap)
  {
  	va_list ap1;
  	int bytes;
  	char *p;
  
  	va_copy(ap1, ap);
  
  	bytes = vsnprintf(NULL, 0, format, ap1) + 1;
  	va_end(ap1);
  
  	*bufp = p = malloc(bytes);
  	if (!p)
  		return -1;
  
  	return vsnprintf(p, bytes, format, ap);
  }
  