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Learn more about: strcspn, wcscspn, _mbscspn, _mbscspn_l |
strcspn, wcscspn, _mbscspn, _mbscspn_l |
4/2/2020 |
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f73f51dd-b533-4e46-ba29-d05c553708a6 |
Returns the index of the first occurrence in a string, of a character that belongs to a set of characters.
Important
_mbschr
and _mbschr_l
cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported in Universal Windows Platform apps.
size_t strcspn(
const char *str,
const char *strCharSet
);
size_t wcscspn(
const wchar_t *str,
const wchar_t *strCharSet
);
size_t _mbscspn(
const unsigned char *str,
const unsigned char *strCharSet
);
size_t _mbscspn_l(
const unsigned char *str,
const unsigned char *strCharSet,
_locale_t locale
);
str
Null-terminated searched string.
strCharSet
Null-terminated character set.
locale
Locale to use.
These functions return the index of the first character in str
that is in strCharSet
. If none of the characters in str
is in strCharSet
, then the return value is the length of str
.
No return value is reserved to indicate an error.
wcscspn
and _mbscspn
are wide-character and multibyte-character versions of strcspn
. The arguments of wcscspn
are wide-character strings. The arguments and return value of _mbscspn
are multibyte-character strings.
_mbscspn
validates its parameters. If either str
or strCharSet
is a null pointer, the invalid parameter handler is invoked, as described in Parameter validation. If execution is allowed to continue, the function returns 0 and sets errno
to EINVAL
. strcspn
and wcscspn
don't validate their parameters. These three functions behave identically otherwise.
The output value is affected by the setting of the LC_CTYPE
category setting of the locale. For more information, see setlocale
. The versions of these functions without the _l
suffix use the current locale for this locale-dependent behavior; the versions with the _l
suffix are identical except that they use the locale parameter passed in instead. For more information, see Locale.
By default, this function's global state is scoped to the application. To change this behavior, see Global state in the CRT.
TCHAR.H routine | _UNICODE and _MBCS not defined |
_MBCS defined |
_UNICODE defined |
---|---|---|---|
_tcscspn |
strcspn |
_mbscspn |
wcscspn |
Routine | Required header |
---|---|
strcspn |
<string.h> |
wcscspn |
<string.h> or <wchar.h> |
_mbscspn , _mbscspn_l |
<mbstring.h> |
For more compatibility information, see Compatibility.
// crt_strcspn.c
#include <string.h>
#include <stdio.h>
void test( const char * str, const char * strCharSet )
{
int pos = strcspn( str, strCharSet );
printf( "strcspn( \"%s\", \"%s\" ) = %d\n", str, strCharSet, pos );
}
int main( void )
{
test( "xyzbxz", "abc" );
test( "xyzbxz", "xyz" );
test( "xyzbxz", "no match" );
test( "xyzbxz", "" );
test( "", "abc" );
test( "", "" );
}
strcspn( "xyzbxz", "abc" ) = 3
strcspn( "xyzbxz", "xyz" ) = 0
strcspn( "xyzbxz", "no match" ) = 6
strcspn( "xyzbxz", "" ) = 6
strcspn( "", "abc" ) = 0
strcspn( "", "" ) = 0
String manipulation
Locale
Interpretation of multibyte-character sequences
strncat
, _strncat_l
, wcsncat
, _wcsncat_l
, _mbsncat
, _mbsncat_l
strncmp
, wcsncmp
, _mbsncmp
, _mbsncmp_l
strncpy
, _strncpy_l
, wcsncpy
, _wcsncpy_l
, _mbsncpy
, _mbsncpy_l
_strnicmp
, _wcsnicmp
, _mbsnicmp
, _strnicmp_l
, _wcsnicmp_l
, _mbsnicmp_l
strrchr
, wcsrchr
, _mbsrchr
, _mbsrchr_l
strspn
, wcsspn
, _mbsspn
, _mbsspn_l