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  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)