1*40ef9009SDavid du Colombier /*
2*40ef9009SDavid du Colombier * The authors of this software are Rob Pike and Ken Thompson.
3*40ef9009SDavid du Colombier * Copyright (c) 2002 by Lucent Technologies.
4*40ef9009SDavid du Colombier * Permission to use, copy, modify, and distribute this software for any
5*40ef9009SDavid du Colombier * purpose without fee is hereby granted, provided that this entire notice
6*40ef9009SDavid du Colombier * is included in all copies of any software which is or includes a copy
7*40ef9009SDavid du Colombier * or modification of this software and in all copies of the supporting
8*40ef9009SDavid du Colombier * documentation for such software.
9*40ef9009SDavid du Colombier * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
10*40ef9009SDavid du Colombier * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE ANY
11*40ef9009SDavid du Colombier * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12*40ef9009SDavid du Colombier * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13*40ef9009SDavid du Colombier */
14*40ef9009SDavid du Colombier #include <stdarg.h>
15*40ef9009SDavid du Colombier #include <string.h>
16*40ef9009SDavid du Colombier #include "utf.h"
17*40ef9009SDavid du Colombier #include "utfdef.h"
18*40ef9009SDavid du Colombier
19*40ef9009SDavid du Colombier char*
utfrune(char * s,long c)20*40ef9009SDavid du Colombier utfrune(char *s, long c)
21*40ef9009SDavid du Colombier {
22*40ef9009SDavid du Colombier long c1;
23*40ef9009SDavid du Colombier Rune r;
24*40ef9009SDavid du Colombier int n;
25*40ef9009SDavid du Colombier
26*40ef9009SDavid du Colombier if(c < Runesync) /* not part of utf sequence */
27*40ef9009SDavid du Colombier return strchr(s, c);
28*40ef9009SDavid du Colombier
29*40ef9009SDavid du Colombier for(;;) {
30*40ef9009SDavid du Colombier c1 = *(uchar*)s;
31*40ef9009SDavid du Colombier if(c1 < Runeself) { /* one byte rune */
32*40ef9009SDavid du Colombier if(c1 == 0)
33*40ef9009SDavid du Colombier return 0;
34*40ef9009SDavid du Colombier if(c1 == c)
35*40ef9009SDavid du Colombier return s;
36*40ef9009SDavid du Colombier s++;
37*40ef9009SDavid du Colombier continue;
38*40ef9009SDavid du Colombier }
39*40ef9009SDavid du Colombier n = chartorune(&r, s);
40*40ef9009SDavid du Colombier if(r == c)
41*40ef9009SDavid du Colombier return s;
42*40ef9009SDavid du Colombier s += n;
43*40ef9009SDavid du Colombier }
44*40ef9009SDavid du Colombier }
45