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Portions of this text are reprinted and reproduced in electronic form in the Sun OS Reference Manual, from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between these versions 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. 6 .\" This notice shall appear on any product containing this material. 7 .\" The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). 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If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner] 10 .TH STRXFRM 3C "Dec 10, 2003" 11 .SH NAME 12 strxfrm \- string transformation 13 .SH SYNOPSIS 14 .LP 15 .nf 16 #include <string.h> 17 18 \fBsize_t\fR \fBstrxfrm\fR(\fBchar *restrict\fR \fIs1\fR, \fBconst char *restrict\fR \fIs2\fR, \fBsize_t\fR \fIn\fR); 19 .fi 20 21 .SH DESCRIPTION 22 .sp 23 .LP 24 The \fBstrxfrm()\fR function transforms the string pointed to by \fIs2\fR and 25 places the resulting string into the array pointed to by \fIs1\fR. The 26 transformation is such that if \fBstrcmp\fR(3C) is applied to two transformed 27 strings, it returns a value greater than, equal to or less than \fB0\fR, 28 corresponding to the result of \fBstrcoll\fR(3C) applied to the same two 29 original strings. No more than \fIn\fR bytes are placed into the resulting 30 array pointed to by \fIs1\fR, including the terminating null byte. If \fIn\fR 31 is \fB0\fR, \fIs1\fR is permitted to be a null pointer. If copying takes place 32 between objects that overlap, the behavior is undefined. 33 .sp 34 .LP 35 The \fBstrxfrm()\fR function does not change the setting of \fBerrno\fR if 36 successful. 37 .sp 38 .LP 39 Since no return value is reserved to indicate an error, an application wishing 40 to check for error situations should set \fBerrno\fR to 0, then call 41 \fBstrxfrm()\fR, then check \fBerrno\fR. 42 .SH RETURN VALUES 43 .sp 44 .LP 45 Upon successful completion, \fBstrxfrm()\fR returns the length of the 46 transformed string (not including the terminating null byte). If the value 47 returned is \fIn\fR or more, the contents of the array pointed to by \fIs1\fR 48 are indeterminate. 49 .sp 50 .LP 51 On error, \fBstrxfrm()\fR may set \fBerrno\fR but no return value is reserved 52 to indicate the error. 53 .SH USAGE 54 .sp 55 .LP 56 The transformation function is such that two transformed strings can be ordered 57 by \fBstrcmp\fR(3C) as appropriate to collating sequence information in the 58 program's locale (category \fBLC_COLLATE\fR). 59 .sp 60 .LP 61 The fact that when \fIn\fR is \fB0\fR, \fIs1\fR is permitted to be a null 62 pointer, is useful to determine the size of the \fIs1\fR array prior to making 63 the transformation. 64 .SH EXAMPLES 65 .LP 66 \fBExample 1 \fRA sample of using the \fBstrxfm()\fR function. 67 .sp 68 .LP 69 The value of the following expression is the size of the array needed to hold 70 the transformation of the string pointed to by \fIs\fR. 71 72 .sp 73 .in +2 74 .nf 75 1 + strxfrm(NULL, s, 0); 76 .fi 77 .in -2 78 79 .SH FILES 80 .sp 81 .ne 2 82 .na 83 \fB\fB/usr/lib/locale/\fIlocale\fR/\fIlocale\fR.so.*\fR\fR 84 .ad 85 .sp .6 86 .RS 4n 87 \fBLC_COLLATE\fR database for \fIlocale\fR 88 .RE 89 90 .SH ATTRIBUTES 91 .sp 92 .LP 93 See \fBattributes\fR(5) for descriptions of the following attributes: 94 .sp 95 96 .sp 97 .TS 98 box; 99 c | c 100 l | l . 101 ATTRIBUTE TYPE ATTRIBUTE VALUE 102 _ 103 CSI Enabled 104 _ 105 Interface Stability Standard 106 _ 107 MT-Level MT-Safe with exceptions 108 .TE 109 110 .sp 111 .LP 112 The \fBstrxfrm()\fR function can be used safely in a multithreaded application, 113 as long as \fBsetlocale\fR(3C) is not being called to change the locale. 114 .SH SEE ALSO 115 .sp 116 .LP 117 \fBlocaledef\fR(1), \fBsetlocale\fR(3C), \fBstrcmp\fR(3C), \fBstrcoll\fR(3C), 118 \fBwscoll\fR(3C), \fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5)