wcscat, wcscat_s
Defined in header <wchar.h> |
||
---|---|---|
(1) | ||
wchar_t *wcscat( wchar_t *dest, const wchar_t *src ); |
(since C95) (until C99) |
|
wchar_t *wcscat(wchar_t *restrict dest, const wchar_t *restrict src); |
(since C99) | |
errno_t wcscat_s(wchar_t *restrict dest, rsize_t destsz, const wchar_t *restrict src); |
(2) | (since C11) |
1) Appends a copy of the wide string pointed to by
src
to the end of the wide string pointed to by
dest
. The wide character
src[0]
replaces the null terminator at the end of
dest
. The resulting wide string is null-terminated. The behavior is undefined if the destination array is not large enough for the contents of both
str
and
dest
and the terminating null wide character. The behavior is undefined if the strings overlap.
2) Same as
(1), except that it may clobber the rest of the destination array (from the last character written to
destsz
) with unspecified values and that the following errors are detected at runtime and call the currently installed
constraint handler function:
-
-
src
ordest
is a null pointer -
destsz
is zero or greater thanRSIZE_MAX/sizeof(wchar_t)
- there is no null terminator in the first
destsz
wide characters ofdest
- truncation would occur (the available space at the end of
dest
would not fit every wide character, including the null terminator, ofsrc
) - overlap would occur between the source and the destination strings
-
-
As with all bounds-checked functions,
wcscat_s
is only guaranteed to be available if__STDC_LIB_EXT1__
is defined by the implementation and if the user defines__STDC_WANT_LIB_EXT1__
to the integer constant 1 before includingwchar.h
.
Parameters
dest | - | pointer to the null-terminated wide string to append to |
src | - | pointer to the null-terminated wide string to copy from |
destsz | - | maximum number of characters to write, typically the size of the destination buffer |
Return value
1) returns a copy of
dest
2) returns zero on success, returns non-zero on error. Also, on error, writes
L'\0'
to
dest[0]
(unless
dest
is a null pointer or
destsz
is zero or greater than
RSIZE_MAX/sizeof(wchar_t)
).
Example
#include <wchar.h> #include <stdio.h> #include <locale.h> int main(void) { wchar_t str[50] = L"Земля, прощай."; wcscat(str, L" "); wcscat(str, L"В добрый путь."); setlocale(LC_ALL, "en_US.utf8"); printf("%ls", str); }
Output:
Земля, прощай. В добрый путь.
References
- C11 standard (ISO/IEC 9899:2011):
- 7.29.4.3.1 The wcscat function (p: 432)
- K.3.9.2.2.1 The wcscat_s function (p: 642-643)
- C99 standard (ISO/IEC 9899:1999):
- 7.24.4.3.1 The wcscat function (p: 378)
See also
(C95)(C11)
|
appends a certain amount of wide characters from one wide string to another (function) |
(C11)
|
concatenates two strings (function) |
(C95)(C11)
|
copies one wide string to another (function) |
C++ documentation for wcscat |
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