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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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MBSTOWCS(3P) POSIX Programmer's Manual MBSTOWCS(3P)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
mbstowcs — convert a character string to a wide-character string
#include <stdlib.h>
size_t mbstowcs(wchar_t *restrict pwcs, const char *restrict s,
size_t n);
The functionality described on this reference page is aligned
with the ISO C standard. Any conflict between the requirements
described here and the ISO C standard is unintentional. This
volume of POSIX.1‐2017 defers to the ISO C standard.
The mbstowcs() function shall convert a sequence of characters
that begins in the initial shift state from the array pointed to
by s into a sequence of corresponding wide-character codes and
shall store not more than n wide-character codes into the array
pointed to by pwcs. No characters that follow a null byte (which
is converted into a wide-character code with value 0) shall be
examined or converted. Each character shall be converted as if by
a call to mbtowc(), except that the shift state of mbtowc() is
not affected.
No more than n elements shall be modified in the array pointed to
by pwcs. If copying takes place between objects that overlap,
the behavior is undefined.
The behavior of this function shall be affected by the LC_CTYPE
category of the current locale. If pwcs is a null pointer,
mbstowcs() shall return the length required to convert the entire
array regardless of the value of n, but no values are stored.
If an invalid character is encountered, mbstowcs() shall return
(size_t)-1 and shall set errno to indicate the error.
Otherwise, mbstowcs() shall return the number of the array
elements modified (or required if pwcs is null), not including a
terminating 0 code, if any. The array shall not be zero-
terminated if the value returned is n.
The mbstowcs() function shall fail if:
EILSEQ An invalid character sequence is detected. In the POSIX
locale an [EILSEQ] error cannot occur since all byte
values are valid characters.
The following sections are informative.
None.
None.
None.
None.
mblen(3p), mbtowc(3p), wctomb(3p), wcstombs(3p)
The Base Definitions volume of POSIX.1‐2017, stdlib.h(0p)
Portions of this text are reprinted and reproduced in electronic
form from IEEE Std 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any
discrepancy between this version and the original IEEE and The
Open Group Standard, the original IEEE and The Open Group
Standard is the referee document. The original Standard can be
obtained online at http://www.opengroup.org/unix/online.html .
Any typographical or formatting errors that appear in this page
are most likely to have been introduced during the conversion of
the source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2017 MBSTOWCS(3P)
Pages that refer to this page: ctype.h(0p), stdlib.h(0p), mblen(3p), mbtowc(3p), setlocale(3p), wcstombs(3p), wctomb(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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