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.\"   Copyright (c) 1994-2006 Lars Wirzenius.  All rights reserved.
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.\" part of publib
.\" "@(#)publib-strutil:$Id: strsub.3,v 1.1.1.1 1994/02/03 17:25:30 liw Exp $"
.\"
.TH STRSUB 3pub "C Programmer's Manual" Publib "C Programmer's Manual"
.SH NAME
strsub \- substitute first occurrence of pattern with another string
.SH SYNOPSIS
.nf
#include <publib.h>
char *\fBstrsub\fR(char *\fIstr\fR, const char *\fIpat\fR, const char *\fIsub\fR);
.SH DESCRIPTION
\fIstrsub\fR finds the first occurrence of the pattern \fIpat\fR in the
string \fIstr\fR (using a method similar to \fIstrstr\fR(3), i.e., no
regular expressions), and replaces it with \fIsub\fR. 
If \fIpat\fR does not occur in \fIstr\fR, no substitution is made.
.PP
Of course, if \fIsub\fR is an empty string, the pattern is deleted from
the string.
.SH "RETURN VALUE"
\fIstrsub\fR returns a pointer to the first character after the substitution,
or NULL if no substitution was made.
.SH EXAMPLE
To substitute up to two occurrences of "foo" with "bar" in a line,
one might do the following.
.sp 1
.nf
.in +5
p = strsub(line, "foo", "bar");
if (p != NULL)
	strsub(line, "foo", "bar");
.in -5
.SH "SEE ALSO"
publib(3), strstr(3), strgsub(3)
.SH AUTHOR
Lars Wirzenius (lars.wirzenius@helsinki.fi)