vsprintf, vswprintf
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Header File
stdio.h
Category
Memory and String Manipulation Routines
Prototype
int vsprintf(char *buffer, const char *format, va_list arglist);
int vswprintf(wchar_t *buffer, const wchar_t *format, va_list arglist);
Description
Writes formatted output to a string.
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.
vsprintf accepts a pointer to a series of arguments, applies to each a format specifier contained in the format string pointed to 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> #include <stdarg.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; }
Portability
POSIX | Win32 | ANSI C | ANSI C++ | |
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vsprintf |
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vswprintf |
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