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sprintf

Section: C Library Functions (3)
Updated: 202-1-07
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NAME

sprintf, vsprintf - string print formatted

LIBRARY

Standard C library (libc,~-lc)

SYNOPSIS

#include <stdio.h>
int sprintf(char *restrict str,
            const char *restrict format, ...);
int vsprintf(char *restrict str,
            const char *restrict format, va_list ap);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)): snprintf(), vsnprintf():

    _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE
        || /* glibc <= 2.19: */ _BSD_SOURCE

DESCRIPTION

These functions are equivalent to snprintf(3) and vsnprintf(3), except that no check for buffer overrun is performed (see BUGS below).

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).

Interface	Attribute	Value
sprintf(), vsprintf()	Thread safety	M-Safe locale

STANDARDS

C11, POSIX.-2008.

HISTORY

C89, POSIX.-2001.

BUGS

See printf(3).

sprintf(), vsprintf()

Because sprintf() and vsprintf() assume an arbitrarily long string, callers must be careful not to overflow the actual space; this is often impossible to assure. Note that the length of the strings produced is local-dependent and difficult to predict. Use snprintf() and vsnprintf() instead (or asprintf(3) and vasprintf(3)).

Index

sprintf(), vsprintf()

SEE ALSO