mbsinit(3) Library Functions Manual mbsinit(3) NAME mbsinit - test for initial shift state LIBRARY Standard C library (libc, -lc) SYNOPSIS #include int mbsinit(const mbstate_t *ps); DESCRIPTION The function mbsinit() tests whether *ps corresponds to an initial shift state. RETURN VALUE mbsinit() returns nonzero if *ps is an initial shift state, or if ps is NULL. Otherwise, it returns 0. ATTRIBUTES For an explanation of the terms used in this section, see attributes(7). allbox; lbx lb lb l l l. Interface Attribute Value T{ mbsinit() T} Thread safety MT-Safe STANDARDS C11, POSIX.1-2008. HISTORY POSIX.1-2001, C99. NOTES The behavior of mbsinit() depends on the LC_CTYPE category of the current locale. SEE ALSO mbstate_t(3type), mbrlen(3), mbrtowc(3), mbsrtowcs(3), wcrtomb(3), wcsr- tombs(3) Linux man-pages 6.18 2026-02-08 mbsinit(3)