Originální popis anglicky:
strxfrm - string transformation
Návod, kniha: POSIX Programmer's Manual
#include <string.h>
size_t strxfrm(char *restrict
s1, const char
*restrict s2, size_t
n);
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.
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.
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.
None.
The transformation function is such that two transformed strings can be ordered
by
strcmp() as appropriate to collating sequence information 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
transformation.
None.
None.
strcmp() ,
strcoll() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<string.h>
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- 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
.
