1TOWCTRANS(3P) POSIX Programmer's Manual TOWCTRANS(3P)
2
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
12 towctrans, towctrans_l — wide-character transliteration
13
15 #include <wctype.h>
16 wint_t towctrans(wint_t wc, wctrans_t desc);
18 wint_t towctrans_l(wint_t wc, wctrans_t desc,
19 locale_t locale);
20
22 For towctrans(): The functionality described on this reference page is
23 aligned with the ISO C standard. Any conflict between the requirements
24 described here and the ISO C standard is unintentional. This volume of
25 POSIX.1‐2017 defers to the ISO C standard.
26 The towctrans() and towctrans_l() functions shall transliterate the
28 wide-character code wc using the mapping described by desc.
29 The current setting of the LC_CTYPE category in the current locale or
31 in the locale represented by locale, respectively, should be the same
32 as during the call to wctrans() or wctrans_l() that returned the value
33 desc.
34 If the value of desc is invalid (that is, not obtained by a call to
36 wctrans() or desc is invalidated by a subsequent call to setlocale()
37 that has affected category LC_CTYPE), the result is unspecified.
38 If the value of desc is invalid (that is, not obtained by a call to
40 wctrans_l() with the same locale object locale) the result is unspeci‐
41 fied.
42 An application wishing to check for error situations should set errno
44 to 0 before calling towctrans() or towctrans_l().
45 If errno is non-zero on return, an error has occurred.
47 The behavior is undefined if the locale argument to towctrans_l() is
49 the special locale object LC_GLOBAL_LOCALE or is not a valid locale
50 object handle.
51
53 If successful, the towctrans() and towctrans_l() functions shall return
54 the mapped value of wc using the mapping described by desc. Otherwise,
55 they shall return wc unchanged.
56
58 These functions may fail if:
59 EINVAL desc contains an invalid transliteration descriptor.
61 The following sections are informative.
63
65 None.
66
68 The strings "tolower" and "toupper" are reserved for the standard map‐
69 ping names. In the table below, the functions in the left column are
70 equivalent to the functions in the right column.
71 towlower(wc) towctrans(wc, wctrans("tolower"))
74 towlower_l(wc, locale) towctrans_l(wc, wctrans("tolower"), locale)
75 towupper(wc) towctrans(wc, wctrans("toupper"))
76 towupper_l(wc, locale) towctrans_l(wc, wctrans("toupper"), locale)
77
79 None.
80
82 None.
83
85 towlower(), towupper(), wctrans()
86 The Base Definitions volume of POSIX.1‐2017, <wctype.h>
88
90 Portions of this text are reprinted and reproduced in electronic form
91 from IEEE Std 1003.1-2017, Standard for Information Technology -- Por‐
92 table Operating System Interface (POSIX), The Open Group Base Specifi‐
93 cations Issue 7, 2018 Edition, Copyright (C) 2018 by the Institute of
94 Electrical and Electronics Engineers, Inc and The Open Group. In the
95 event of any discrepancy between this version and the original IEEE and
96 The Open Group Standard, the original IEEE and The Open Group Standard
97 is the referee document. The original Standard can be obtained online
98 at http://www.opengroup.org/unix/online.html .
99 Any typographical or formatting errors that appear in this page are
101 most likely to have been introduced during the conversion of the source
102 files to man page format. To report such errors, see https://www.ker‐
103 nel.org/doc/man-pages/reporting_bugs.html .
104IEEE/The Open Group 2017 TOWCTRANS(3P)