vsprintf

raw OCR

Writes formatted output to a string.

Defined in header <stdarg.h>

Syntax

#include <stdarg.h>
int vsprintf(char *bujfer, const char *format,vajist arglist);

Portability

DOS	UNIX	Windows	ANSI C	C++ only
■	■		■

Remarks

Available on UNIX system V. The v...printf functions are known as alternate entry points for the ...printf functions. They behave exactly like their ...printf counterparts, but they accept a pointer to a list of arguments instead of an argument list.

See printf for details

vsprintf accepts a pointer to a series of arguments, applies to each

on format specifiers.

a format	contained in the format	to
specifier	string pointed by

format, and outputs the formatted data to a string. There must be the same number of format specifiers as arguments.

Return value

vsprintf returns the number of bytes output. In the event of error, vsprintf returns EOF.

Example

  #include <stdio.h>
  #include <conio.h>

  char buffer[80];
■ int vspf(char  *fmt, ...)
   {
     va_list  argptr;
      int cnt;
     va_start (argptr, fmt) ;
     cnt  = vsprintf(buffer, fmt, argptr);
     va_end(argptr) ;
     return (cnt);
   }
  int main (void)
   {
     int  inumber =30;
      float fnumber = 90.0;
     char  string[4] = "abc";
     vspf("%d-%f  %s", inumber, fnumber, string);
     printf ("%s\n", buffer);
     return  0;
   }

Differences from modern implementations

Nothing recorded yet.

Modern references

These are search links, not yet checked by hand.

Stable link: /3.1/stdarg.h/vsprintf/ · short form /3.1/vsprintf/