Thomas Martitz | 50a6ca3 | 2010-05-06 21:04:40 +0000 | [diff] [blame] | 1 | /*************************************************************************** |
| 2 | * __________ __ ___. |
| 3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| 4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| 5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| 6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| 7 | * \/ \/ \/ \/ \/ |
| 8 | * $Id$ |
| 9 | * |
| 10 | * Copyright (C) 2002 by Gary Czvitkovicz |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version 2 |
| 15 | * of the License, or (at your option) any later version. |
| 16 | * |
| 17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
| 18 | * KIND, either express or implied. |
| 19 | * |
| 20 | ****************************************************************************/ |
| 21 | |
| 22 | /* |
| 23 | * Minimal printf and snprintf formatting functions |
| 24 | * |
| 25 | * These support %c %s %d and %x |
| 26 | * Field width and zero-padding flag only |
| 27 | */ |
| 28 | |
| 29 | #include <stdio.h> |
| 30 | #include <stdarg.h> |
| 31 | #include <stdbool.h> |
| 32 | #include <limits.h> |
| 33 | #include "format.h" |
| 34 | |
| 35 | /* ALSA library requires a more advanced snprintf, so let's not |
| 36 | override it in simulator for Linux. Note that Cygwin requires |
| 37 | our snprintf or it produces garbled output after a while. */ |
| 38 | |
| 39 | struct for_snprintf { |
| 40 | unsigned char *ptr; /* where to store it */ |
| 41 | size_t bytes; /* amount already stored */ |
| 42 | size_t max; /* max amount to store */ |
| 43 | }; |
| 44 | |
| 45 | static int sprfunc(void *ptr, unsigned char letter) |
| 46 | { |
| 47 | struct for_snprintf *pr = (struct for_snprintf *)ptr; |
| 48 | if(pr->bytes < pr->max) { |
| 49 | *pr->ptr = letter; |
| 50 | pr->ptr++; |
| 51 | pr->bytes++; |
| 52 | return true; |
| 53 | } |
| 54 | return false; /* filled buffer */ |
| 55 | } |
| 56 | |
| 57 | |
| 58 | int snprintf(char *buf, size_t size, const char *fmt, ...) |
| 59 | { |
Thomas Martitz | 50a6ca3 | 2010-05-06 21:04:40 +0000 | [diff] [blame] | 60 | va_list ap; |
| 61 | struct for_snprintf pr; |
| 62 | |
| 63 | pr.ptr = (unsigned char *)buf; |
| 64 | pr.bytes = 0; |
| 65 | pr.max = size; |
| 66 | |
| 67 | va_start(ap, fmt); |
Rafaël Carré | 5a98ad2 | 2010-09-20 08:55:45 +0000 | [diff] [blame] | 68 | format(sprfunc, &pr, fmt, ap); |
Thomas Martitz | 50a6ca3 | 2010-05-06 21:04:40 +0000 | [diff] [blame] | 69 | va_end(ap); |
| 70 | |
| 71 | /* make sure it ends with a trailing zero */ |
| 72 | pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0'; |
| 73 | |
| 74 | return pr.bytes; |
| 75 | } |
| 76 | |
| 77 | int vsnprintf(char *buf, size_t size, const char *fmt, va_list ap) |
| 78 | { |
Thomas Martitz | 50a6ca3 | 2010-05-06 21:04:40 +0000 | [diff] [blame] | 79 | struct for_snprintf pr; |
| 80 | |
| 81 | pr.ptr = (unsigned char *)buf; |
| 82 | pr.bytes = 0; |
| 83 | pr.max = size; |
| 84 | |
Rafaël Carré | 5a98ad2 | 2010-09-20 08:55:45 +0000 | [diff] [blame] | 85 | format(sprfunc, &pr, fmt, ap); |
Thomas Martitz | 50a6ca3 | 2010-05-06 21:04:40 +0000 | [diff] [blame] | 86 | |
| 87 | /* make sure it ends with a trailing zero */ |
| 88 | pr.ptr[(pr.bytes < pr.max) ? 0 : -1] = '\0'; |
| 89 | |
| 90 | return pr.bytes; |
| 91 | } |