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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/string/multibyte/wctob.html below:

wctob - cppreference.com

int wctob( wint_t c );

Narrows a wide character c if its multibyte character equivalent in the initial shift state is a single byte.

This is typically possible for the characters from the ASCII character set, since most multibyte encodings (such as UTF-8) use single bytes to encode those characters.

EOF if c does not represent a multibyte character with length 1 in initial shift state.

otherwise, the single-byte representation of c as unsigned char converted to int

#include <locale.h>
#include <wchar.h>
#include <stdio.h>
#include <assert.h>
 
void try_narrowing(wchar_t c)
{
    int cn = wctob(c);
    if(cn != EOF)
        printf("%#x narrowed to %#x\n", c, cn);
    else
        printf("%#x could not be narrowed\n", c);
}
 
int main(void)
{
    char* utf_locale_present = setlocale(LC_ALL, "th_TH.utf8");
    assert(utf_locale_present);
    puts("In Thai UTF-8 locale:");
    try_narrowing(L'a');
    try_narrowing(L'๛');
 
    char* tis_locale_present = setlocale(LC_ALL, "th_TH.tis620");
    assert(tis_locale_present);
    puts("In Thai TIS-620 locale:");
    try_narrowing(L'a');
    try_narrowing(L'๛');
}

Possible output:

In Thai UTF-8 locale:
0x61 narrowed to 0x61
0xe5b could not be narrowed
In Thai TIS-620 locale:
0x61 narrowed to 0x61
0xe5b narrowed to 0xfb

• C11 standard (ISO/IEC 9899:2011):

• 7.29.6.1.2 The wctob function (p: 441)

• C99 standard (ISO/IEC 9899:1999):

• 7.24.6.1.2 The wctob function (p: 387)

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