Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

wcsxfrm(3) [linux man page]

WCSXFRM(P)						     POSIX Programmer's Manual							WCSXFRM(P)

NAME
wcsxfrm - wide-character string transformation SYNOPSIS
#include <wchar.h> size_t wcsxfrm(wchar_t *restrict ws1, const wchar_t *restrict ws2, size_t n); DESCRIPTION
The wcsxfrm() function shall transform the wide-character string pointed to by ws2 and place the resulting wide-character string into the array pointed to by ws1. The transformation shall be such that if wcscmp() is applied to two transformed wide strings, it shall return a value greater than, equal to, or less than 0, corresponding to the result of wcscoll() applied to the same two original wide-character strings. No more than n wide-character codes shall be placed into the resulting array pointed to by ws1, including the terminating null wide-character code. If n is 0, ws1 is permitted to be a null pointer. If copying takes place between objects that overlap, the behavior is undefined. The wcsxfrm() function shall not change the setting of errno if successful. Since no return value is reserved to indicate an error, an application wishing to check for error situations should set errno to 0, then call wcsxfrm(), then check errno. RETURN VALUE
The wcsxfrm() function shall return the length of the transformed wide-character string (not including the terminating null wide-character code). If the value returned is n or more, the contents of the array pointed to by ws1 are unspecified. On error, the wcsxfrm() function may set errno, but no return value is reserved to indicate an error. ERRORS
The wcsxfrm() function may fail if: EINVAL The wide-character string pointed to by ws2 contains wide-character codes outside the domain of the collating sequence. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The transformation function is such that two transformed wide-character strings can be ordered by wcscmp() as appropriate to collating sequence information in the program's locale (category LC_COLLATE ). The fact that when n is 0 ws1 is permitted to be a null pointer is useful to determine the size of the ws1 array prior to making the trans- formation. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
wcscmp() , wcscoll() , the Base Definitions volume of IEEE Std 1003.1-2001, <wchar.h> COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol- ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 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 . IEEE
/The Open Group 2003 WCSXFRM(P)

Check Out this Related Man Page

wcsxfrm(3C)                                                Standard C Library Functions                                                wcsxfrm(3C)

NAME
wcsxfrm, wsxfrm - wide character string transformation SYNOPSIS
#include <wchar.h> size_t wcsxfrm(wchar_t *ws1, const wchar_t *ws2, size_t n); size_t wsxfrm(wchar_t *ws1, const wchar_t *ws2, size_t n); DESCRIPTION
The wcsxfrm() and wcsxfrm() functions transform the wide character string pointed to by ws2 and place the resulting wide character string into the array pointed to by ws1. The transformation is such that if either the wcscmp(3C) or wscmp(3C) functions are applied to two trans- formed wide strings, they return a value greater than, equal to, or less than 0, corresponding to the result of the wcscoll(3C) or wscoll(3C) function applied to the same two original wide character strings. No more than n wide-character codes are placed into the resulting array pointed to by ws1, including the terminating null wide-character code. If n is 0, ws1 is permitted to be a null pointer. If copying takes place between objects that overlap, the behavior is undefined. The wcsxfrm() and wsxfrm() functions do not change the setting of errno if successful. Since no return value is reserved to indicate an error, an application wishing to check for error situations should set errno to 0, then call wcsxfrm() or wsxfrm(), then check errno. RETURN VALUES
The wcsxfrm() and wsxfrm() functions return the length of the transformed wide character string (not including the terminating null wide- character code). If the value returned is n or more, the contents of the array pointed to by ws1 are indeterminate. On error, wcsxfrm() and wsxfrm() may set errno but no return value is reserved to indicate an error. ERRORS
The wcsxfrm() and wsxfrm() functions may fail if: EINVAL The wide character string pointed to by ws2 contains wide-character codes outside the domain of the collating sequence. USAGE
The transformation function is such that two transformed wide character strings can be ordered by the wcscmp() or wscmp() functions as appropriate to collating sequence information in the program's locale (category LC_COLLATE). The fact that when n is 0, ws1 is permitted to be a null pointer, is useful to determine the size of the ws1 array prior to making the transformation. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |wcsxfrm() is Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe with exceptions | +-----------------------------+-----------------------------+ The wcsxfrm() and wsxfrm() functions can be used safely in multithreaded applications as long as setlocale(3C) is not being called to change the locale. SEE ALSO
setlocale(3C), wcscmp(3C), wcscoll(3C), wscmp(3C), wscoll(3C), attributes(5), standards(5) SunOS 5.10 1 Nov 2003 wcsxfrm(3C)
Man Page