1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/* $Id: qprintf.c 728 2007-01-14 11:14:38Z michael $
* $URL: https://ssl.bulix.org/svn/lcd4linux/branches/0.10.1/qprintf.c $
*
* simple but quick snprintf() replacement
*
* Copyright (C) 2004 Michael Reinelt <reinelt@eunet.at>
* Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
*
* derived from a patch from Martin Hejl which is
* Copyright (C) 2003 Martin Hejl (martin@hejl.de)
*
* This file is part of LCD4Linux.
*
* LCD4Linux is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* LCD4Linux is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/*
* exported functions:
*
* int qprintf(char *str, size_t size, const char *format, ...)
* works like snprintf(), but format only knows about %d and %s
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
static char *itoa(char *buffer, const size_t size, int value)
{
char *p;
int sign;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* remember sign of value */
sign = 0;
if (value < 0) {
sign = 1;
value = -value;
}
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
*--p = value % 10 + '0';
value = value / 10;
} while (value != 0 && p > buffer);
if (sign && p > buffer)
*--p = '-';
return p;
}
static char *utoa(char *buffer, const size_t size, unsigned int value)
{
char *p;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
*--p = value % 10 + '0';
value = value / 10;
} while (value != 0 && p > buffer);
return p;
}
static char *utox(char *buffer, const size_t size, unsigned int value)
{
char *p;
int digit;
/* sanity checks */
if (buffer == NULL || size < 2)
return (NULL);
/* p points to last char */
p = buffer + size - 1;
/* set terminating zero */
*p = '\0';
do {
digit = value % 16;
value = value / 16;
*--p = (digit < 10 ? '0' : 'a' - 10) + digit;
} while (value != 0 && p > buffer);
return p;
}
int qprintf(char *str, const size_t size, const char *format, ...)
{
va_list ap;
const char *src;
char *dst;
unsigned int len;
src = format;
dst = str;
len = 0;
va_start(ap, format);
/* use size-1 for terminating zero */
while (len < size - 1) {
if (*src == '%') {
char buf[12], *s;
int d;
unsigned int u;
switch (*++src) {
case 's':
src++;
s = va_arg(ap, char *);
while (len < size - 1 && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'd':
src++;
d = va_arg(ap, int);
s = itoa(buf, sizeof(buf), d);
while (len < size && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'u':
src++;
u = va_arg(ap, unsigned int);
s = utoa(buf, sizeof(buf), u);
while (len < size - 1 && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
case 'x':
src++;
u = va_arg(ap, unsigned int);
s = utox(buf, sizeof(buf), u);
while (len < size - 1 && *s != '\0') {
len++;
*dst++ = *s++;
}
break;
default:
len++;
*dst++ = '%';
}
} else {
len++;
*dst++ = *src;
if (*src++ == '\0')
break;
}
}
va_end(ap);
/* enforce terminating zero */
if (len >= size - 1 && *(dst - 1) != '\0') {
len++;
*dst = '\0';
}
/* do not count terminating zero */
return len - 1;
}
|
