. \" @(#)patcompile.3	1.3 16/01/27 Copyright 1985,1995-2016 J. Schilling
. \"  Manual Seite fuer patcompile
. \"
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.TH PATCOMPILE 3 "15. Juli 1988" "J\*org Schilling" "Schily\'s LIBRARY FUNCTIONS"
.SH NAME
patcompile() \- compiles a matching pattern
.SH SYNOPSIS
.nf
.B
int patcompile(pattern, length, aux)
.B	char *pattern;
.B	int length;
.B	int aux[];
.fi
.SH DESCRIPTION
.B patcompile()
compiles a pattern into an internal form which
.BR patmatch (3)
can use.
.PP
The string at
.I pattern
with size 
.I length
is scanned. The array
.B aux
is filled in with state information for
.BR patmatch (3).
.B aux
should have at least
.I length
elements.
.SH RETURNS
Returns 0 if the pattern contains an error.
.PP
Other values should be passed to
.BR patmatch (3)
as the
.B alt
argument.
.SH "SEE ALSO
.BR match (1)
.PP
For a description ot the regular expressions.
.SH NOTES
The pattern matching functions are based on ones presented by
Martin Richards in "A Compact Function for Regular Expression
Pattern Matching", Software-Practice and Experience vol 9,
527-534 (1979).