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strxfrm(3c) [sunos man page]

strxfrm(3C)						   Standard C Library Functions 					       strxfrm(3C)

NAME
strxfrm - string transformation SYNOPSIS
#include <string.h> size_t strxfrm(char *restrict s1, const char *restrict s2, size_t n); DESCRIPTION
The strxfrm() function transforms the string pointed to by s2 and places the resulting string into the array pointed to by s1. The trans- formation is such that if strcmp(3C) is applied to two transformed strings, it returns a value greater than, equal to or less than 0, cor- responding to the result of strcoll(3C) applied to the same two original strings. No more than n bytes are placed into the resulting array pointed to by s1, including the terminating null byte. If n is 0, s1 is permitted to be a null pointer. If copying takes place between objects that overlap, the behavior is undefined. The strxfrm() function does 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 strxfrm(), then check errno. RETURN VALUES
Upon successful completion, strxfrm() returns the length of the transformed string (not including the terminating null byte). If the value returned is n or more, the contents of the array pointed to by s1 are indeterminate. On error, strxfrm() may set errno but no return value is reserved to indicate the error. USAGE
The transformation function is such that two transformed strings can be ordered by strcmp(3C) as appropriate to collating sequence informa- tion in the program's locale (category LC_COLLATE). The fact that when n is 0, s1 is permitted to be a null pointer, is useful to determine the size of the s1 array prior to making the trans- formation. EXAMPLES
Example 1: A sample of using the strxfm() function. The value of the following expression is the size of the array needed to hold the transformation of the string pointed to by s. 1 + strxfrm(NULL, s, 0); FILES
/usr/lib/locale/locale/locale.so.* LC_COLLATE database for locale ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe with exceptions | +-----------------------------+-----------------------------+ The strxfrm() function can be used safely in a multithreaded application, as long as setlocale(3C) is not being called to change the locale. SEE ALSO
localedef(1), setlocale(3C), strcmp(3C), strcoll(3C), wscoll(3C), attributes(5), environ(5), standards(5) SunOS 5.10 10 Dec 2003 strxfrm(3C)

Check Out this Related Man Page

STRXFRM(3P)						     POSIX Programmer's Manual						       STRXFRM(3P)

PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the correspond- ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux. NAME
strxfrm - string transformation SYNOPSIS
#include <string.h> size_t strxfrm(char *restrict s1, const char *restrict s2, size_t n); DESCRIPTION
The strxfrm() function shall transform the string pointed to by s2 and place the resulting string into the array pointed to by s1. The transformation is such that if strcmp() is applied to two transformed strings, it shall return a value greater than, equal to, or less than 0, corresponding to the result of strcoll() applied to the same two original strings. No more than n bytes are placed into the resulting array pointed to by s1, including the terminating null byte. If n is 0, s1 is permitted to be a null pointer. If copying takes place between objects that overlap, the behavior is undefined. The strxfrm() 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 strxfrm(), then check errno. RETURN VALUE
Upon successful completion, strxfrm() shall return the length of the transformed string (not including the terminating null byte). If the value returned is n or more, the contents of the array pointed to by s1 are unspecified. On error, strxfrm() may set errno but no return value is reserved to indicate an error. ERRORS
The strxfrm() function may fail if: EINVAL The string pointed to by the s2 argument contains characters outside the domain of the collating sequence. The following sections are informative. EXAMPLES
None. APPLICATION USAGE
The transformation function is such that two transformed strings can be ordered by strcmp() as appropriate to collating sequence informa- tion in the program's locale (category LC_COLLATE ). The fact that when n is 0 s1 is permitted to be a null pointer is useful to determine the size of the s1 array prior to making the trans- formation. RATIONALE
None. FUTURE DIRECTIONS
None. SEE ALSO
strcmp(), strcoll(), the Base Definitions volume of IEEE Std 1003.1-2001, <string.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 STRXFRM(3P)

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