#include "safe_str_lib.h"

Include dependency graph for swprintf_s.c:

Functions
EXPORT int	swprintf_s (wchar_t restrict dest, rsize_t dmax, const wchar_t restrict fmt,...)
	The `swprintf_s` function composes a wide string with same test that would be printed if format was used on `wprintf`. More...

Function Documentation

◆ swprintf_s()

EXPORT int swprintf_s	(	wchar_t *restrict	dest,
		rsize_t	dmax,
		const wchar_t *restrict	fmt,
			...
	)

The swprintf_s function composes a wide string with same test that would be printed if format was used on wprintf.

Instead of being printed, the content is stored in dest. With SAFECLIB_STR_NULL_SLACK defined all elements following the terminating null character (if any) written by swprintf_s in the array of dmax wide characters pointed to by dest are nulled when swprintf_s returns.

Note: POSIX specifies that errno is set on error. However, the safeclib extended ES* errors do not set errno, only when the underlying system vswprintf call fails, errno is set.

Remarks

SPECIFIED IN

C11 standard (ISO/IEC 9899:2011): K.3.9.1.4 The swprintf_s function (p: 630-631) http://en.cppreference.com/w/c/io/fwprintf

Parameters

[out]	dest	pointer to wide string that will be written into.
[in]	dmax	restricted maximum length of dest
[in]	fmt	format-control wide string.
[in]	...	optional arguments

Precondition: Neither dest nor fmt shall be a null pointer.; dmax shall not be greater than RSIZE_MAX_WSTR.; dmax shall not equal zero.; dmax shall be greater than wcsnlen_s(dest, dmax).; fmt shall not contain the conversion specifier n; None of the arguments corresponding to s is a null pointer. (not yet); No encoding error shall occur.

Note: C11 uses RSIZE_MAX, not RSIZE_MAX_WSTR.; While narrow strings provide snprintf, which makes it possible to determine the required output buffer size, there is no equivalent for wide strings (until C11's swprintf_s), and in order to determine the buffer size, the program may need to call swprintf, check the result value, and reallocate a larger buffer, trying again until successful.

Returns: If no runtime-constraint violation occurred, the swprintf_s function returns the number of wide characters written in the array, not counting the terminating null wide character. If an encoding error occurred or if n or more wide characters are requested to be written, swprintf_s returns a negative value. If any other runtime-constraint violation occurred, swprintf_s returns zero, and sets errno.; If the buffer dest is too small for the formatted text, including the terminating null, then the buffer is set to an empty string by placing a null wide character at dest[0], and the invalid parameter handler is invoked.

errno: ESNULLP when dest/fmt is NULL pointer ESZEROL when dmax = 0 ESLEMAX when dmax > RSIZE_MAX_WSTR ESNOSPC when return value exceeds dmax EINVAL when fmt contains n

Return values

-1	if an encoding error occurred or if n or more wide characters are requested to be written.
0	on some other error

See also: vswprintf_s(), snwprintf_s(), vsnprintf_s()

Functions

Function Documentation

◆ swprintf_s()