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