1 .\" Copyright (c) 2002-2004 Tim J. Robbins
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25 .\" $FreeBSD: head/lib/libc/locale/mbrtowc.3 250883 2013-05-21 19:59:37Z ed $
37 .Nd "convert a character to a wide-character code (restartable)"
44 .Fa "wchar_t * restrict pc" "const char * restrict s" "size_t n"
45 .Fa "mbstate_t * restrict ps"
50 .Fa "char16_t * restrict pc" "const char * restrict s" "size_t n"
51 .Fa "mbstate_t * restrict ps"
55 .Fa "char32_t * restrict pc" "const char * restrict s" "size_t n"
56 .Fa "mbstate_t * restrict ps"
61 .Fa "wchar_t * restrict pc" "const char * restrict s" "size_t n"
62 .Fa "mbstate_t * restrict ps" "locale_t locale"
66 .Fa "char16_t * restrict pc" "const char * restrict s" "size_t n"
67 .Fa "mbstate_t * restrict ps" "locale_t locale"
71 .Fa "char32_t * restrict pc" "const char * restrict s" "size_t n"
72 .Fa "mbstate_t * restrict ps" "locale_t locale"
83 functions inspect at most
87 to determine the number of bytes needed to complete the next multibyte
89 If a character can be completed, and
93 the wide character which is represented by
106 these functions behave as if
121 is used to keep track of the shift state.
124 these functions use an internal, static
126 object, which is initialized to the initial conversion state
131 is not large enough to represent certain multibyte characters, the
133 function may need to be invoked multiple times to convert a single
134 multibyte character sequence.
141 functions take an explicit
143 argument, whereas the
148 functions use the current global or per-thread locale.
159 .Bl -tag -width indent
164 represent the null wide character
169 or fewer bytes represent a valid character, these functions
170 return the number of bytes used to complete the multibyte character.
171 .It Po Vt size_t Pc Ns \-1
172 An encoding error has occurred.
175 or fewer bytes do not contribute to a valid multibyte character.
176 .It Po Vt size_t Pc Ns \-2
179 contribute to, but do not complete, a valid multibyte character sequence,
182 bytes have been processed.
189 functions also return:
190 .Bl -tag -width indent
191 .It Po Vt size_t Pc Ns \-3
192 The next character resulting from a previous call has been stored.
193 No bytes from the input have been consumed.
204 functions will fail if:
207 An invalid multibyte sequence was detected.
209 The conversion state is invalid.