1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <stdarg.h>
30
31 #include <boot/boot.h>
32 #include "libc_private.h"
33
34 struct snprintf_ctxt
35 {
36 char *next;
37 int avail;
38 };
39
snprintf_putc(unsigned n,void * cookie)40 static void snprintf_putc(unsigned n, void *cookie)
41 {
42 struct snprintf_ctxt *ctxt = cookie;
43
44 if(ctxt->avail > 0) {
45 *ctxt->next++ = n;
46 ctxt->avail--;
47 }
48 }
49
snprintf(char * str,int sz,const char * fmt,...)50 int snprintf(char *str, int sz, const char *fmt, ...)
51 {
52 va_list ap;
53 struct snprintf_ctxt ctxt;
54
55 if(sz < 1) return 0;
56
57 ctxt.avail = sz - 1;
58 ctxt.next = str;
59
60 va_start(ap, fmt);
61 __xprintf(fmt, ap, snprintf_putc, &ctxt);
62 va_end(ap);
63
64 *ctxt.next = 0;
65 return ctxt.next - str;
66 }
67