|
<![CDATA[
#define B 131
char *search( pat, text )
char *pat, *text;
{ int hpat, htext, Bm, j, m;
if( pat[0]==EOS ) return( text );
Bm = 1;
hpat = htext = 0;
for( m=0; text[m] != EOS && pat[m] != EOS; m++ ) {
Bm *= B;
hpat = hpat*B + pat[m];
htext = htext*B + text[m];
}
if( text[m]==EOS && pat[m]!=EOS ) return( NULL );
for( j=m; TRUE; j++ ) {
if( hpat==htext && strncmp(text+j-m,pat,m)==0 )
return( text+j-m );
if( text[j]==EOS ) return( NULL );
htext = htext*B - text[j-m]*Bm + text[j];
}
}
]]> |
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C source (715.srch.c) 