summaryrefslogtreecommitdiff
path: root/src/console/vtxprintf.c
blob: 3c75e3d7041d97bcbf5816fb52a05fb498627151 (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
/*  vtxprintf.c, from
 *    linux/lib/vsprintf.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <string.h>
#include <div64.h>
#include <console/vtxprintf.h>

/* haha, don't need ctype.c */
#define isdigit(c)	((c) >= '0' && (c) <= '9')
#define is_digit isdigit
#define isxdigit(c)	(((c) >= '0' && (c) <= '9') || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))

static int skip_atoi(const char **s)
{
	int i=0;

	while (is_digit(**s))
		i = i*10 + *((*s)++) - '0';
	return i;
}

#define ZEROPAD	1		/* pad with zero */
#define SIGN	2		/* unsigned/signed long */
#define PLUS	4		/* show plus */
#define SPACE	8		/* space if plus */
#define LEFT	16		/* left justified */
#define SPECIAL	32		/* 0x */
#define LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */

static int number(void (*tx_byte)(unsigned char byte), 
	unsigned long long num, int base, int size, int precision, int type)
{
	char c,sign,tmp[66];
	const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
	int i;
	int count = 0;

	if (type & LARGE)
		digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	if (type & LEFT)
		type &= ~ZEROPAD;
	if (base < 2 || base > 36)
		return 0;
	c = (type & ZEROPAD) ? '0' : ' ';
	sign = 0;
	if (type & SIGN) {
		if ((signed long long)num < 0) {
			sign = '-';
			num = -num;
			size--;
		} else if (type & PLUS) {
			sign = '+';
			size--;
		} else if (type & SPACE) {
			sign = ' ';
			size--;
		}
	}
	if (type & SPECIAL) {
		if (base == 16)
			size -= 2;
		else if (base == 8)
			size--;
	}
	i = 0;
	if (num == 0)
		tmp[i++]='0';
	else while (num != 0)
		tmp[i++] = digits[do_div(num,base)];
	if (i > precision)
		precision = i;
	size -= precision;
	if (!(type&(ZEROPAD+LEFT)))
		while(size-->0)
			tx_byte(' '), count++;
	if (sign)
		tx_byte(sign), count++;
	if (type & SPECIAL) {
		if (base==8)
			tx_byte('0'), count++;
		else if (base==16) {
			tx_byte('0'), count++;
			tx_byte(digits[33]), count++;
		}
	}
	if (!(type & LEFT))
		while (size-- > 0)
			tx_byte(c), count++;
	while (i < precision--)
		tx_byte('0'), count++;
	while (i-- > 0)
		tx_byte(tmp[i]), count++;
	while (size-- > 0)
		tx_byte(' '), count++;
	return count;
}


int vtxprintf(void (*tx_byte)(unsigned char byte), const char *fmt, va_list args)
{
	int len;
	unsigned long long num;
	int i, base;
	const char *s;

	int flags;		/* flags to number() */

	int field_width;	/* width of output field */
	int precision;		/* min. # of digits for integers; max
				   number of chars for from string */
	int qualifier;		/* 'h', 'l', or 'L' for integer fields */
	
	int count;

	for (count=0; *fmt ; ++fmt) {
		if (*fmt != '%') {
			tx_byte(*fmt), count++;
			continue;
		}
			
		/* process flags */
		flags = 0;
		repeat:
			++fmt;		/* this also skips first '%' */
			switch (*fmt) {
				case '-': flags |= LEFT; goto repeat;
				case '+': flags |= PLUS; goto repeat;
				case ' ': flags |= SPACE; goto repeat;
				case '#': flags |= SPECIAL; goto repeat;
				case '0': flags |= ZEROPAD; goto repeat;
				}
		
		/* get field width */
		field_width = -1;
		if (is_digit(*fmt))
			field_width = skip_atoi(&fmt);
		else if (*fmt == '*') {
			++fmt;
			/* it's the next argument */
			field_width = va_arg(args, int);
			if (field_width < 0) {
				field_width = -field_width;
				flags |= LEFT;
			}
		}

		/* get the precision */
		precision = -1;
		if (*fmt == '.') {
			++fmt;	
			if (is_digit(*fmt))
				precision = skip_atoi(&fmt);
			else if (*fmt == '*') {
				++fmt;
				/* it's the next argument */
				precision = va_arg(args, int);
			}
			if (precision < 0)
				precision = 0;
		}

		/* get the conversion qualifier */
		qualifier = -1;
		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
			qualifier = *fmt;
			++fmt;
			if (*fmt == 'l') {
				qualifier = 'L';
				++fmt;
			}
		}

		/* default base */
		base = 10;

		switch (*fmt) {
		case 'c':
			if (!(flags & LEFT))
				while (--field_width > 0)
					tx_byte(' '), count++;
			tx_byte((unsigned char) va_arg(args, int)), count++;
			while (--field_width > 0)
				tx_byte(' '), count++;
			continue;

		case 's':
			s = va_arg(args, char *);
			if (!s)
				s = "<NULL>";

			len = strnlen(s, precision);

			if (!(flags & LEFT))
				while (len < field_width--)
					tx_byte(' '), count++;
			for (i = 0; i < len; ++i)
				tx_byte(*s++), count++;
			while (len < field_width--)
				tx_byte(' '), count++;
			continue;

		case 'p':
			if (field_width == -1) {
				field_width = 2*sizeof(void *);
				flags |= ZEROPAD;
			}
			count += number(tx_byte,
				(unsigned long) va_arg(args, void *), 16,
				field_width, precision, flags);
			continue;


		case 'n':
			if (qualifier == 'L') {
				long long *ip = va_arg(args, long long *);
				*ip = count;
			} else if (qualifier == 'l') {
				long * ip = va_arg(args, long *);
				*ip = count;
			} else {
				int * ip = va_arg(args, int *);
				*ip = count;
			}
			continue;

		case '%':
			tx_byte('%'), count++;
			continue;

		/* integer number formats - set up the flags and "break" */
		case 'o':
			base = 8;
			break;

		case 'X':
			flags |= LARGE;
		case 'x':
			base = 16;
			break;

		case 'd':
		case 'i':
			flags |= SIGN;
		case 'u':
			break;

		default:
			tx_byte('%'), count++;
			if (*fmt)
				tx_byte(*fmt), count++;
			else
				--fmt;
			continue;
		}
		if (qualifier == 'L') {
			num = va_arg(args, unsigned long long);
		} else if (qualifier == 'l') {
			num = va_arg(args, unsigned long);
		} else if (qualifier == 'h') {
			num = (unsigned short) va_arg(args, int);
			if (flags & SIGN)
				num = (short) num;
		} else if (flags & SIGN) {
			num = va_arg(args, int);
		} else {
			num = va_arg(args, unsigned int);
		}
		count += number(tx_byte, num, base, field_width, precision, flags);
	}
	return count;
}