1 '\" te
   2 .\" Copyright 2014 Garrett D'Amore <garrett@damore.org>
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  11 .TH STRXFRM 3C "Jun 21, 2014"
  12 .SH NAME
  13 strxfrm, strxfrm_l \- string transformation
  14 .SH SYNOPSIS
  15 .LP
  16 .nf
  17 #include <string.h>
  18 
  19 \fBsize_t\fR \fBstrxfrm\fR(\fBchar *restrict\fR \fIs1\fR, \fBconst char *restrict\fR \fIs2\fR, \fBsize_t\fR \fIn\fR);
  20 .fi
  21 .LP
  22 .nf
  23 \fBsize_t\fR \fBstrxfrm_l\fR(\fBchar *restrict\fR \fIs1\fR, \fBconst char *restrict\fR \fIs2\fR, \fBsize_t\fR \fIn\fR,
  24     \fBlocale_t\fR \fIloc\fR);
  25 .fi
  26 .SH DESCRIPTION
  27 .LP
  28 The \fBstrxfrm()\fR function transforms the string pointed to by \fIs2\fR and
  29 places the resulting string into the array pointed to by \fIs1\fR. The
  30 transformation is such that if \fBstrcmp\fR(3C) is applied to two transformed
  31 strings, it returns a value greater than, equal to or less than \fB0\fR,
  32 corresponding to the result of \fBstrcoll\fR(3C) applied to the same two
  33 original strings. No more than \fIn\fR bytes are placed into the resulting
  34 array pointed to by \fIs1\fR, including the terminating null byte.  If \fIn\fR
  35 is \fB0\fR, \fIs1\fR is permitted to be a null pointer. If copying takes place
  36 between objects that overlap, the behavior is undefined.
  37 .LP
  38 The \fBstrxfrm()\fR function does not change the setting of \fBerrno\fR if
  39 successful.
  40 .LP
  41 Since no return value is reserved to indicate an error, an application wishing
  42 to check for error situations should set \fBerrno\fR to 0, then call
  43 \fBstrxfrm()\fR, then check \fBerrno\fR.
  44 .LP
  45 The \fBstrxfrm_l()\fR functions behaves identically to the function
  46 \fBstrxfrm()\fR, except instead of operating in the current locale it
  47 operates in the locale specified by the argument \fIloc\fR.
  48 .SH RETURN VALUES
  49 .LP
  50 Upon successful completion, \fBstrxfrm()\fR returns the length of the
  51 transformed string (not including the terminating null byte). If the value
  52 returned is \fIn\fR or more, the contents of the array pointed to by \fIs1\fR
  53 are indeterminate.
  54 .LP
  55 On error, \fBstrxfrm()\fR may set \fBerrno\fR but no return value is reserved
  56 to indicate the error.
  57 .SH USAGE
  58 .LP
  59 The transformation function is such that two transformed strings can be ordered
  60 by \fBstrcmp\fR(3C) as appropriate to collating sequence information in the
  61 locale (category \fBLC_COLLATE\fR).
  62 .LP
  63 The fact that when \fIn\fR is \fB0\fR, \fIs1\fR is permitted to be a null
  64 pointer, is useful to determine the size of the \fIs1\fR array prior to making
  65 the transformation.
  66 .SH EXAMPLES
  67 .LP
  68 \fBExample 1 \fRA sample of using the \fBstrxfm()\fR function.
  69 .LP
  70 The value of the following expression is the size of the array needed to hold
  71 the transformation of the string pointed to by \fIs\fR.
  72 
  73 .sp
  74 .in +2
  75 .nf
  76 1 + strxfrm(NULL, s, 0);
  77 .fi
  78 .in -2
  79 
  80 .SH FILES
  81 .IP \fB/usr/lib/locale/\fR\fIlocale\fR\fB/LC_COLLATE/*
  82 collation database for \fIlocale\fR
  83 .SH ATTRIBUTES
  84 .LP
  85 See \fBattributes\fR(5) for descriptions of the following attributes:
  86 .TS
  87 box;
  88 c | c
  89 l | l .
  90 ATTRIBUTE TYPE  ATTRIBUTE VALUE
  91 _
  92 CSI     Enabled
  93 _
  94 Interface Stability     Standard
  95 _
  96 MT-Level        MT-Safe
  97 .TE
  98 
  99 .SH SEE ALSO
 100 .LP
 101 \fBlocaledef\fR(1), \fBnewlocale\fR(3C), \fBsetlocale\fR(3C), \fBstrcmp\fR(3C),
 102 \fBstrcoll\fR(3C), \fBuselocale\fR(3C),
 103 \fBwscoll\fR(3C), \fBattributes\fR(5), \fBenviron\fR(5), \fBstandards\fR(5)