03-30-2011
How will the behaviour of multibyte char differ because of different LC_CTYPE locale?
I am comparing two multibyte characters in two different platforms having different LC_CTYPE variables, they are returning different values.
One of the variable is sigma initialised to "\317\203"
and the other one is empty string i.e, ""
Below is the scenario of the two platforms:
In AIX:
LC_CTYPE="en_GB"
In Linux:
LC_CTYPE="en_US.UTF-8"
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LEARN ABOUT REDHAT
mbrlen
MBRLEN(3) Linux Programmer's Manual MBRLEN(3)
NAME
mbrlen - determine number of bytes in next multibyte character
SYNOPSIS
#include <wchar.h>
size_t mbrlen(const char *s, size_t n, mbstate_t *ps);
DESCRIPTION
The mbrlen function inspects at most n bytes of the multibyte string starting at s and extracts the next complete multibyte character. It
updates the shift state *ps. If the multibyte character is not the null wide character, it returns the number of bytes that were consumed
from s. If the multibyte character is the null wide character, it resets the shift state *ps to the initial state and returns 0.
If the n bytes starting at s do not contain a complete multibyte character, mbrlen returns (size_t)(-2). This can happen even if n >=
MB_CUR_MAX, if the multibyte string contains redundant shift sequences.
If the multibyte string starting at s contains an invalid multibyte sequence before the next complete character, mbrlen returns
(size_t)(-1) and sets errno to EILSEQ. In this case, the effects on *ps are undefined.
If ps is a NULL pointer, a static anonymous state only known to the mbrlen function is used instead.
RETURN VALUE
The mbrlen function returns the number of bytes parsed from the multibyte sequence starting at s, if a non-null wide character was recog-
nized. It returns 0, if a null wide character was recognized. It returns (size_t)(-1) and sets errno to EILSEQ, if an invalid multibyte
sequence was encountered. It returns (size_t)(-2) if it couldn't parse a complete multibyte character, meaning that n should be increased.
CONFORMING TO
ISO/ANSI C, UNIX98
SEE ALSO
mbrtowc(3)
NOTES
The behaviour of mbrlen depends on the LC_CTYPE category of the current locale.
GNU
1999-07-25 MBRLEN(3)