small but tough idea for a new function‏‏

[Patrice Schoumi <pschoumacher at hotmail dot com>]

Hello,
 
It is difficult for a beginner programmer to create its own function with variable argument ex : printf, sprintf etc !!
 
There exists a function : int sprintf( ...) but not char *ssprintf( ....) !!!
 
I found in the library GLBC code sprintf : 
int ssprintf(char *s, const char *format, ...)
{
 va_list arg;
 int done;
 va_start (arg, format);
 done = vsprintf (s, format, arg);
 va_end (arg);
 return (done);
}
 
If you create this function : char *ssprintf(...
 
char *ssprintf(char *s, const char *format, ...)
{
 va_list arg;
 int done;
 va_start (arg, format);
 done = vsprintf (s, format, arg);
 va_end (arg);
 return ((char *)s);
}
 
This function return : s = programmeur string 
With this function it is possible to transform : 
A basic function int fct(char *) to a function with a variable argument int fct(char *s,char *fmt,...) with a simple #define !!!!!
 
My example: 
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdarg.h>
 
// simple stderr print
int fct(char *s)
{
 if( s )
 {
 fprintf(stderr,"%s");
 return(0);
 } 
return(-1);
}
 
void main(void)
{
 char text[80];
 
sprintf(text,"Hello glibc my name is : %s","fct");
 
fct( text );
 
}
 
// => My idea 
char buff[1024];
 
#define newfct(format,....) fct( ssprintf(buff,format,__VA_ARGS__))
 
// In main() now you can write 
int num=15;
 
newfct("Hello %s my name is : %s and num=%d ","glibc","newfct",num);
 
With char *ssprintf(...) any programmer can make a function with arguments !!
 
best regards,
 
www.llist.fr