1WCSXFRM(3P) POSIX Programmer's Manual WCSXFRM(3P)
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6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
10
13 wcsxfrm, wcsxfrm_l — wide-character string transformation
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16 #include <wchar.h>
17 size_t wcsxfrm(wchar_t *restrict ws1, const wchar_t *restrict ws2,
19 size_t n);
20 size_t wcsxfrm_l(wchar_t *restrict ws1, const wchar_t *restrict ws2,
21 size_t n, locale_t locale);
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24 For wcsxfrm(): The functionality described on this reference page is
25 aligned with the ISO C standard. Any conflict between the requirements
26 described here and the ISO C standard is unintentional. This volume of
27 POSIX.1‐2008 defers to the ISO C standard.
28 The wcsxfrm() and wcsxfrm_l() functions shall transform the wide-char‐
30 acter string pointed to by ws2 and place the resulting wide-character
31 string into the array pointed to by ws1. The transformation shall be
32 such that if wcscmp() is applied to two transformed wide strings, it
33 shall return a value greater than, equal to, or less than 0, corre‐
34 sponding to the result of wcscoll() and wcscoll_l() applied to the same
35 two original wide-character strings, and the same LC_COLLATE category
36 of the current locale or the locale object locale, respectively. No
37 more than n wide-character codes shall be placed into the resulting
38 array pointed to by ws1, including the terminating null wide-character
39 code. If n is 0, ws1 is permitted to be a null pointer. If copying
40 takes place between objects that overlap, the behavior is undefined.
41 The wcsxfrm() and wcsxfrm_l() functions shall not change the setting of
43 errno if successful.
44 Since no return value is reserved to indicate an error, an application
46 wishing to check for error situations should set errno to 0, then call
47 wcsxfrm() or wcsxfrm_l(), then check errno.
48 The behavior is undefined if the locale argument to wcsxfrm_l() is the
50 special locale object LC_GLOBAL_LOCALE or is not a valid locale object
51 handle.
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54 The wcsxfrm() and wcsxfrm_l() functions shall return the length of the
55 transformed wide-character string (not including the terminating null
56 wide-character code). If the value returned is n or more, the contents
57 of the array pointed to by ws1 are unspecified.
58 On error, the wcsxfrm() and wcsxfrm_l() functions may set errno, but no
60 return value is reserved to indicate an error.
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63 These functions may fail if:
64 EINVAL The wide-character string pointed to by ws2 contains wide-char‐
66 acter codes outside the domain of the collating sequence.
67 The following sections are informative.
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71 None.
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74 The transformation function is such that two transformed wide-character
75 strings can be ordered by wcscmp() as appropriate to collating sequence
76 information in the current locale (category LC_COLLATE).
77 The fact that when n is 0 ws1 is permitted to be a null pointer is use‐
79 ful to determine the size of the ws1 array prior to making the trans‐
80 formation.
81
83 None.
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86 None.
87
89 wcscmp(), wcscoll()
90 The Base Definitions volume of POSIX.1‐2008, <wchar.h>
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94 Portions of this text are reprinted and reproduced in electronic form
95 from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
96 -- Portable Operating System Interface (POSIX), The Open Group Base
97 Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
98 cal and Electronics Engineers, Inc and The Open Group. (This is
99 POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
100 event of any discrepancy between this version and the original IEEE and
101 The Open Group Standard, the original IEEE and The Open Group Standard
102 is the referee document. The original Standard can be obtained online
103 at http://www.unix.org/online.html .
104 Any typographical or formatting errors that appear in this page are
106 most likely to have been introduced during the conversion of the source
107 files to man page format. To report such errors, see https://www.ker‐
108 nel.org/doc/man-pages/reporting_bugs.html .
109IEEE/The Open Group 2013 WCSXFRM(3P)