1 /*
2  * The authors of this software are Rob Pike and Ken Thompson.
3  *              Copyright (c) 2002 by Lucent Technologies.
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose without fee is hereby granted, provided that this entire notice
6  * is included in all copies of any software which is or includes a copy
7  * or modification of this software and in all copies of the supporting
8  * documentation for such software.
9  * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
10  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
11  * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
12  * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
13  */
14 #include <stdarg.h>
15 #include <string.h>
16 #include "plan9.h"
17 #include "fmt.h"
18 #include "fmtdef.h"
19 
20 /* format the output into f->to and return the number of characters fmted  */
21 
22 int
23 dorfmt(Fmt *f, const Rune *fmt)
24 {
25 	Rune *rt, *rs;
26 	int r;
27 	char *t, *s;
28 	int nfmt;
29 
30 	nfmt = f->nfmt;
31 	for(;;){
32 		if(f->runes){
33 			rt = f->to;
34 			rs = f->stop;
35 			while((r = *fmt++) && r != '%'){
36 				FMTRCHAR(f, rt, rs, r);
37 			}
38 			f->nfmt += rt - (Rune *)f->to;
39 			f->to = rt;
40 			if(!r)
41 				return f->nfmt - nfmt;
42 			f->stop = rs;
43 		}else{
44 			t = f->to;
45 			s = f->stop;
46 			while((r = *fmt++) && r != '%'){
47 				FMTRUNE(f, t, f->stop, r);
48 			}
49 			f->nfmt += t - (char *)f->to;
50 			f->to = t;
51 			if(!r)
52 				return f->nfmt - nfmt;
53 			f->stop = s;
54 		}
55 
56 		fmt = __fmtdispatch(f, (Rune*)fmt, 1);
57 		if(fmt == nil)
58 			return -1;
59 	}
60 	return 0;		/* not reached */
61 }