The spec says that mbsrtowcs() should return the length of the string
_even_when_the_output_buffer_is_NULL_ .
currently mbsrtowcs(NULL, ...) returns 0.
#include <stdio.h>
#include <wchar.h>
#include <string.h>
main()
{
int len;
char* s = "test";
mbstate_t mbstate;
memset(&mbstate, 0, sizeof(mbstate));
len = mbsrtowcs(NULL, (const char **)&s, 0, &mbstate);
printf("s='%s' - strlen(s)=%d - mbstowcs(s)=%d\n", s, strlen(s), len);
}
cygwin$ ./mbsrtowcs
s='test' - strlen(s)=4 - mbstowcs(s)=0
linux$ ./mbsrtowcs
s='test' - strlen(s)=4 - mbstowcs(s)=4
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