Count the bytes in a multibyte character (restartable)
#include <wchar.h>
size_t mbrlen( const char * s,
size_t n,
mbstate_t * ps);
- s
- A pointer to a multibyte character.
- n
- The maximum number of bytes that you want to count.
- ps
- An internal pointer that lets mbrlen() be a restartable
version of
mblen();
if ps is NULL, mbrlen() uses its own
internal variable.
You can call
mbsinit()
to determine the status of this variable.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The mbrlen() function counts the bytes in the multibyte
character pointed to by s, to a maximum of n bytes.
- (size_t)-2
- The resulting conversion state indicates an incomplete multibyte character after all
n characters were converted.
- (size_t)-1
- The function detected an encoding error before completing the next
multibyte character, in which case the function
errno
to EILSEQ
and leaves the resulting conversion state undefined.
- 0
- The next completed character is a null character, in which case the resulting conversion state is the initial conversion state.
- x
- The number of bytes needed to complete the next multibyte
character, in which case the resulting conversion state indicates that x bytes have been converted.
- EILSEQ
- Invalid character sequence.
- EINVAL
- The ps argument points to an invalid object.
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
No |
Signal handler |
Yes |
Thread |
Yes |
errno
mblen(),
mbrtowc(),
mbsinit(),
mbsrtowcs(),
mbstowcs(),
mbtowc()