summaryrefslogtreecommitdiffstats
path: root/qemu/roms/SLOF/lib/libc/stdio/vsnprintf.c
blob: 21dd04dfe46f8f8fa5ad0001e7d736e99bb785f5 (plain)
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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/******************************************************************************
 * Copyright (c) 2004, 2008 IBM Corporation
 * All rights reserved.
 * This program and the accompanying materials
 * are made available under the terms of the BSD License
 * which accompanies this distribution, and is available at
 * http://www.opensource.org/licenses/bsd-license.php
 *
 * Contributors:
 *     IBM Corporation - initial implementation
 *****************************************************************************/

#include <stdbool.h>
#include "stdio.h"
#include "stdlib.h"
#include "string.h"
#include "ctype.h"

static const unsigned long long convert[] = {
	0x0, 0xFF, 0xFFFF, 0xFFFFFF, 0xFFFFFFFF,
	0xFFFFFFFFFFULL, 0xFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFULL, 0xFFFFFFFFFFFFFFFFULL
};

static int
print_str_fill(char **buffer, size_t bufsize, char *sizec,
					const char *str, char c)
{
	int i, sizei, len;
	char *bstart = *buffer;

	sizei = strtoul(sizec, NULL, 10);
	len = strlen(str);
	if (sizei > len) {
		for (i = 0;
			(i < (sizei - len)) && ((*buffer - bstart) < bufsize);
									i++) {
			**buffer = c;
			*buffer += 1;
		}
	}
	return 1;
}

static int
print_str(char **buffer, size_t bufsize, const char *str)
{
	char *bstart = *buffer;
	size_t i;

	for (i = 0; (i < strlen(str)) && ((*buffer - bstart) < bufsize); i++) {
		**buffer = str[i];
		*buffer += 1;
	}
	return 1;
}

static unsigned int
print_intlen(unsigned long value, unsigned short int base)
{
	int i = 0;

	while (value > 0) {
		value /= base;
		i++;
	}
	if (i == 0)
		i = 1;
	return i;
}

static int
print_itoa(char **buffer, size_t bufsize, unsigned long value,
					unsigned short base, bool upper)
{
	const char zeichen[] = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
	char c;
	size_t i, len;

	if(base <= 2 || base > 16)
		return 0;

	len = i = print_intlen(value, base);

	/* Don't print to buffer if bufsize is not enough. */
	if (len > bufsize)
		return 0;

	do {
		c = zeichen[value % base];
		if (upper)
			c = toupper(c);

		(*buffer)[--i] = c;
		value /= base;
	} while(value);

	*buffer += len;

	return 1;
}



static int
print_fill(char **buffer, size_t bufsize, char *sizec, unsigned long size,
				unsigned short int base, char c, int optlen)
{
	int i, sizei, len;
	char *bstart = *buffer;

	sizei = strtoul(sizec, NULL, 10);
 	len = print_intlen(size, base) + optlen;
	if (sizei > len) {
		for (i = 0;
			(i < (sizei - len)) && ((*buffer - bstart) < bufsize);
									i++) {
			**buffer = c;
			*buffer += 1;
		}
	}

	return 0;
}


static int
print_format(char **buffer, size_t bufsize, const char *format, void *var)
{
	char *start;
	unsigned int i = 0, length_mod = sizeof(int);
	unsigned long value = 0;
	unsigned long signBit;
	char *form, sizec[32];
	char sign = ' ';
	bool upper = false;

	form  = (char *) format;
	start = *buffer;

	form++;
	if(*form == '0' || *form == '.') {
		sign = '0';
		form++;
	}

	while ((*form != '\0') && ((*buffer - start) < bufsize)) {
		switch(*form) {
			case 'u':
			case 'd':
			case 'i':
				sizec[i] = '\0';
				value = (unsigned long) var;
				signBit = 0x1ULL << (length_mod * 8 - 1);
				if ((*form != 'u') && (signBit & value)) {
					**buffer = '-';
					*buffer += 1;
					value = (-(unsigned long)value) & convert[length_mod];
				}
				print_fill(buffer, bufsize - (*buffer - start),
						sizec, value, 10, sign, 0);
				print_itoa(buffer, bufsize - (*buffer - start),
							value, 10, upper);
				break;
			case 'X':
				upper = true;
			case 'x':
				sizec[i] = '\0';
				value = (unsigned long) var & convert[length_mod];
				print_fill(buffer, bufsize - (*buffer - start),
						sizec, value, 16, sign, 0);
				print_itoa(buffer, bufsize - (*buffer - start),
							value, 16, upper);
				break;
			case 'O':
			case 'o':
				sizec[i] = '\0';
				value = (long int) var & convert[length_mod];
				print_fill(buffer, bufsize - (*buffer - start),
						sizec, value, 8, sign, 0);
				print_itoa(buffer, bufsize - (*buffer - start),
							value, 8, upper);
				break;
			case 'p':
				sizec[i] = '\0';
				print_fill(buffer, bufsize - (*buffer - start),
					sizec, (unsigned long) var, 16, ' ', 2);
				print_str(buffer, bufsize - (*buffer - start),
									"0x");
				print_itoa(buffer, bufsize - (*buffer - start),
						(unsigned long) var, 16, upper);
				break;
			case 'c':
				sizec[i] = '\0';
				print_fill(buffer, bufsize - (*buffer - start),
							sizec, 1, 10, ' ', 0);
				**buffer = (unsigned long) var;
				*buffer += 1;
				break;
			case 's':
				sizec[i] = '\0';
				print_str_fill(buffer,
					bufsize - (*buffer - start), sizec,
							(char *) var, ' ');

				print_str(buffer, bufsize - (*buffer - start),
								(char *) var);
				break;
			case 'l':
				form++;
				if(*form == 'l') {
					length_mod = sizeof(long long int);
				} else {
					form--;
					length_mod = sizeof(long int);
				}
				break;
			case 'h':
				form++;
				if(*form == 'h') {
					length_mod = sizeof(signed char);
				} else {
					form--;
					length_mod = sizeof(short int);
				}
				break;
			case 'z':
				length_mod = sizeof(size_t);
				break;
			default:
				if(*form >= '0' && *form <= '9')
					sizec[i++] = *form;
		}
		form++;
	}

	
	return (long int) (*buffer - start);
}


/*
 * The vsnprintf function prints a formated strings into a buffer.
 * BUG: buffer size checking does not fully work yet
 */
int
vsnprintf(char *buffer, size_t bufsize, const char *format, va_list arg)
{
	char *ptr, *bstart;

	bstart = buffer;
	ptr = (char *) format;

	/*
	 * Return from here if size passed is zero, otherwise we would
	 * overrun buffer while setting NULL character at the end.
	 */
	if (!buffer || !bufsize)
		return 0;

	/* Leave one space for NULL character */
	bufsize--;

	while(*ptr != '\0' && (buffer - bstart) < bufsize)
	{
		if(*ptr == '%') {
			char formstr[20];
			int i=0;
			
			do {
				formstr[i] = *ptr;
				ptr++;
				i++;
			} while(!(*ptr == 'd' || *ptr == 'i' || *ptr == 'u' || *ptr == 'x' || *ptr == 'X'
						|| *ptr == 'p' || *ptr == 'c' || *ptr == 's' || *ptr == '%'
						|| *ptr == 'O' || *ptr == 'o' )); 
			formstr[i++] = *ptr;
			formstr[i] = '\0';
			if(*ptr == '%') {
				*buffer++ = '%';
			} else {
				print_format(&buffer,
					bufsize - (buffer - bstart),
					formstr, va_arg(arg, void *));
			}
			ptr++;
		} else {

			*buffer = *ptr;

			buffer++;
			ptr++;
		}
	}
	
	*buffer = '\0';

	return (buffer - bstart);
}