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-rw-r--r--arch/x86/boot/printf.c307
1 files changed, 307 insertions, 0 deletions
diff --git a/arch/x86/boot/printf.c b/arch/x86/boot/printf.c
new file mode 100644
index 000000000000..1a09f9309d3c
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+++ b/arch/x86/boot/printf.c
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1/* -*- linux-c -*- ------------------------------------------------------- *
2 *
3 * Copyright (C) 1991, 1992 Linus Torvalds
4 * Copyright 2007 rPath, Inc. - All Rights Reserved
5 *
6 * This file is part of the Linux kernel, and is made available under
7 * the terms of the GNU General Public License version 2.
8 *
9 * ----------------------------------------------------------------------- */
10
11/*
12 * arch/i386/boot/printf.c
13 *
14 * Oh, it's a waste of space, but oh-so-yummy for debugging. This
15 * version of printf() does not include 64-bit support. "Live with
16 * it."
17 *
18 */
19
20#include "boot.h"
21
22static int skip_atoi(const char **s)
23{
24 int i = 0;
25
26 while (isdigit(**s))
27 i = i * 10 + *((*s)++) - '0';
28 return i;
29}
30
31#define ZEROPAD 1 /* pad with zero */
32#define SIGN 2 /* unsigned/signed long */
33#define PLUS 4 /* show plus */
34#define SPACE 8 /* space if plus */
35#define LEFT 16 /* left justified */
36#define SPECIAL 32 /* 0x */
37#define LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
38
39#define do_div(n,base) ({ \
40int __res; \
41__res = ((unsigned long) n) % (unsigned) base; \
42n = ((unsigned long) n) / (unsigned) base; \
43__res; })
44
45static char *number(char *str, long num, int base, int size, int precision,
46 int type)
47{
48 char c, sign, tmp[66];
49 const char *digits = "0123456789abcdefghijklmnopqrstuvwxyz";
50 int i;
51
52 if (type & LARGE)
53 digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
54 if (type & LEFT)
55 type &= ~ZEROPAD;
56 if (base < 2 || base > 36)
57 return 0;
58 c = (type & ZEROPAD) ? '0' : ' ';
59 sign = 0;
60 if (type & SIGN) {
61 if (num < 0) {
62 sign = '-';
63 num = -num;
64 size--;
65 } else if (type & PLUS) {
66 sign = '+';
67 size--;
68 } else if (type & SPACE) {
69 sign = ' ';
70 size--;
71 }
72 }
73 if (type & SPECIAL) {
74 if (base == 16)
75 size -= 2;
76 else if (base == 8)
77 size--;
78 }
79 i = 0;
80 if (num == 0)
81 tmp[i++] = '0';
82 else
83 while (num != 0)
84 tmp[i++] = digits[do_div(num, base)];
85 if (i > precision)
86 precision = i;
87 size -= precision;
88 if (!(type & (ZEROPAD + LEFT)))
89 while (size-- > 0)
90 *str++ = ' ';
91 if (sign)
92 *str++ = sign;
93 if (type & SPECIAL) {
94 if (base == 8)
95 *str++ = '0';
96 else if (base == 16) {
97 *str++ = '0';
98 *str++ = digits[33];
99 }
100 }
101 if (!(type & LEFT))
102 while (size-- > 0)
103 *str++ = c;
104 while (i < precision--)
105 *str++ = '0';
106 while (i-- > 0)
107 *str++ = tmp[i];
108 while (size-- > 0)
109 *str++ = ' ';
110 return str;
111}
112
113int vsprintf(char *buf, const char *fmt, va_list args)
114{
115 int len;
116 unsigned long num;
117 int i, base;
118 char *str;
119 const char *s;
120
121 int flags; /* flags to number() */
122
123 int field_width; /* width of output field */
124 int precision; /* min. # of digits for integers; max
125 number of chars for from string */
126 int qualifier; /* 'h', 'l', or 'L' for integer fields */
127
128 for (str = buf; *fmt; ++fmt) {
129 if (*fmt != '%') {
130 *str++ = *fmt;
131 continue;
132 }
133
134 /* process flags */
135 flags = 0;
136 repeat:
137 ++fmt; /* this also skips first '%' */
138 switch (*fmt) {
139 case '-':
140 flags |= LEFT;
141 goto repeat;
142 case '+':
143 flags |= PLUS;
144 goto repeat;
145 case ' ':
146 flags |= SPACE;
147 goto repeat;
148 case '#':
149 flags |= SPECIAL;
150 goto repeat;
151 case '0':
152 flags |= ZEROPAD;
153 goto repeat;
154 }
155
156 /* get field width */
157 field_width = -1;
158 if (isdigit(*fmt))
159 field_width = skip_atoi(&fmt);
160 else if (*fmt == '*') {
161 ++fmt;
162 /* it's the next argument */
163 field_width = va_arg(args, int);
164 if (field_width < 0) {
165 field_width = -field_width;
166 flags |= LEFT;
167 }
168 }
169
170 /* get the precision */
171 precision = -1;
172 if (*fmt == '.') {
173 ++fmt;
174 if (isdigit(*fmt))
175 precision = skip_atoi(&fmt);
176 else if (*fmt == '*') {
177 ++fmt;
178 /* it's the next argument */
179 precision = va_arg(args, int);
180 }
181 if (precision < 0)
182 precision = 0;
183 }
184
185 /* get the conversion qualifier */
186 qualifier = -1;
187 if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
188 qualifier = *fmt;
189 ++fmt;
190 }
191
192 /* default base */
193 base = 10;
194
195 switch (*fmt) {
196 case 'c':
197 if (!(flags & LEFT))
198 while (--field_width > 0)
199 *str++ = ' ';
200 *str++ = (unsigned char)va_arg(args, int);
201 while (--field_width > 0)
202 *str++ = ' ';
203 continue;
204
205 case 's':
206 s = va_arg(args, char *);
207 len = strnlen(s, precision);
208
209 if (!(flags & LEFT))
210 while (len < field_width--)
211 *str++ = ' ';
212 for (i = 0; i < len; ++i)
213 *str++ = *s++;
214 while (len < field_width--)
215 *str++ = ' ';
216 continue;
217
218 case 'p':
219 if (field_width == -1) {
220 field_width = 2 * sizeof(void *);
221 flags |= ZEROPAD;
222 }
223 str = number(str,
224 (unsigned long)va_arg(args, void *), 16,
225 field_width, precision, flags);
226 continue;
227
228 case 'n':
229 if (qualifier == 'l') {
230 long *ip = va_arg(args, long *);
231 *ip = (str - buf);
232 } else {
233 int *ip = va_arg(args, int *);
234 *ip = (str - buf);
235 }
236 continue;
237
238 case '%':
239 *str++ = '%';
240 continue;
241
242 /* integer number formats - set up the flags and "break" */
243 case 'o':
244 base = 8;
245 break;
246
247 case 'X':
248 flags |= LARGE;
249 case 'x':
250 base = 16;
251 break;
252
253 case 'd':
254 case 'i':
255 flags |= SIGN;
256 case 'u':
257 break;
258
259 default:
260 *str++ = '%';
261 if (*fmt)
262 *str++ = *fmt;
263 else
264 --fmt;
265 continue;
266 }
267 if (qualifier == 'l')
268 num = va_arg(args, unsigned long);
269 else if (qualifier == 'h') {
270 num = (unsigned short)va_arg(args, int);
271 if (flags & SIGN)
272 num = (short)num;
273 } else if (flags & SIGN)
274 num = va_arg(args, int);
275 else
276 num = va_arg(args, unsigned int);
277 str = number(str, num, base, field_width, precision, flags);
278 }
279 *str = '\0';
280 return str - buf;
281}
282
283int sprintf(char *buf, const char *fmt, ...)
284{
285 va_list args;
286 int i;
287
288 va_start(args, fmt);
289 i = vsprintf(buf, fmt, args);
290 va_end(args);
291 return i;
292}
293
294int printf(const char *fmt, ...)
295{
296 char printf_buf[1024];
297 va_list args;
298 int printed;
299
300 va_start(args, fmt);
301 printed = vsprintf(printf_buf, fmt, args);
302 va_end(args);
303
304 puts(printf_buf);
305
306 return printed;
307}
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