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10 .TH STRXFRM 3C "Dec 10, 2003"
12 strxfrm \- string transformation
18 \fBsize_t\fR \fBstrxfrm\fR(\fBchar *restrict\fR \fIs1\fR, \fBconst char *restrict\fR \fIs2\fR, \fBsize_t\fR \fIn\fR);
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.
35 The \fBstrxfrm()\fR function does not change the setting of \fBerrno\fR if
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.
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
51 On error, \fBstrxfrm()\fR may set \fBerrno\fR but no return value is reserved
52 to indicate the error.
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).
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
66 \fBExample 1 \fRA sample of using the \fBstrxfm()\fR function.
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.
75 1 + strxfrm(NULL, s, 0);
83 \fB\fB/usr/lib/locale/\fIlocale\fR/\fIlocale\fR.so.*\fR\fR
87 \fBLC_COLLATE\fR database for \fIlocale\fR
93 See \fBattributes\fR(5) for descriptions of the following attributes:
101 ATTRIBUTE TYPE ATTRIBUTE VALUE
105 Interface Stability Standard
107 MT-Level MT-Safe with exceptions
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.
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)