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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 | ||
22 | static 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 SMALL 32 /* Must be 32 == 0x20 */ | |
37 | #define SPECIAL 64 /* 0x */ | |
38 | ||
39 | #define do_div(n,base) ({ \ | |
40 | int __res; \ | |
41 | __res = ((unsigned long) n) % (unsigned) base; \ | |
42 | n = ((unsigned long) n) / (unsigned) base; \ | |
43 | __res; }) | |
44 | ||
45 | static char *number(char *str, long num, int base, int size, int precision, | |
46 | int type) | |
47 | { | |
48 | /* we are called with base 8, 10 or 16, only, thus don't need "G..." */ | |
49 | static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */ | |
50 | ||
51 | char tmp[66]; | |
52 | char c, sign, locase; | |
53 | int i; | |
54 | ||
55 | /* locase = 0 or 0x20. ORing digits or letters with 'locase' | |
56 | * produces same digits or (maybe lowercased) letters */ | |
57 | locase = (type & SMALL); | |
58 | if (type & LEFT) | |
59 | type &= ~ZEROPAD; | |
60 | if (base < 2 || base > 36) | |
61 | return 0; | |
62 | c = (type & ZEROPAD) ? '0' : ' '; | |
63 | sign = 0; | |
64 | if (type & SIGN) { | |
65 | if (num < 0) { | |
66 | sign = '-'; | |
67 | num = -num; | |
68 | size--; | |
69 | } else if (type & PLUS) { | |
70 | sign = '+'; | |
71 | size--; | |
72 | } else if (type & SPACE) { | |
73 | sign = ' '; | |
74 | size--; | |
75 | } | |
76 | } | |
77 | if (type & SPECIAL) { | |
78 | if (base == 16) | |
79 | size -= 2; | |
80 | else if (base == 8) | |
81 | size--; | |
82 | } | |
83 | i = 0; | |
84 | if (num == 0) | |
85 | tmp[i++] = '0'; | |
86 | else | |
87 | while (num != 0) | |
88 | tmp[i++] = (digits[do_div(num, base)] | locase); | |
89 | if (i > precision) | |
90 | precision = i; | |
91 | size -= precision; | |
92 | if (!(type & (ZEROPAD + LEFT))) | |
93 | while (size-- > 0) | |
94 | *str++ = ' '; | |
95 | if (sign) | |
96 | *str++ = sign; | |
97 | if (type & SPECIAL) { | |
98 | if (base == 8) | |
99 | *str++ = '0'; | |
100 | else if (base == 16) { | |
101 | *str++ = '0'; | |
102 | *str++ = ('X' | locase); | |
103 | } | |
104 | } | |
105 | if (!(type & LEFT)) | |
106 | while (size-- > 0) | |
107 | *str++ = c; | |
108 | while (i < precision--) | |
109 | *str++ = '0'; | |
110 | while (i-- > 0) | |
111 | *str++ = tmp[i]; | |
112 | while (size-- > 0) | |
113 | *str++ = ' '; | |
114 | return str; | |
115 | } | |
116 | ||
117 | int vsprintf(char *buf, const char *fmt, va_list args) | |
118 | { | |
119 | int len; | |
120 | unsigned long num; | |
121 | int i, base; | |
122 | char *str; | |
123 | const char *s; | |
124 | ||
125 | int flags; /* flags to number() */ | |
126 | ||
127 | int field_width; /* width of output field */ | |
128 | int precision; /* min. # of digits for integers; max | |
129 | number of chars for from string */ | |
130 | int qualifier; /* 'h', 'l', or 'L' for integer fields */ | |
131 | ||
132 | for (str = buf; *fmt; ++fmt) { | |
133 | if (*fmt != '%') { | |
134 | *str++ = *fmt; | |
135 | continue; | |
136 | } | |
137 | ||
138 | /* process flags */ | |
139 | flags = 0; | |
140 | repeat: | |
141 | ++fmt; /* this also skips first '%' */ | |
142 | switch (*fmt) { | |
143 | case '-': | |
144 | flags |= LEFT; | |
145 | goto repeat; | |
146 | case '+': | |
147 | flags |= PLUS; | |
148 | goto repeat; | |
149 | case ' ': | |
150 | flags |= SPACE; | |
151 | goto repeat; | |
152 | case '#': | |
153 | flags |= SPECIAL; | |
154 | goto repeat; | |
155 | case '0': | |
156 | flags |= ZEROPAD; | |
157 | goto repeat; | |
158 | } | |
159 | ||
160 | /* get field width */ | |
161 | field_width = -1; | |
162 | if (isdigit(*fmt)) | |
163 | field_width = skip_atoi(&fmt); | |
164 | else if (*fmt == '*') { | |
165 | ++fmt; | |
166 | /* it's the next argument */ | |
167 | field_width = va_arg(args, int); | |
168 | if (field_width < 0) { | |
169 | field_width = -field_width; | |
170 | flags |= LEFT; | |
171 | } | |
172 | } | |
173 | ||
174 | /* get the precision */ | |
175 | precision = -1; | |
176 | if (*fmt == '.') { | |
177 | ++fmt; | |
178 | if (isdigit(*fmt)) | |
179 | precision = skip_atoi(&fmt); | |
180 | else if (*fmt == '*') { | |
181 | ++fmt; | |
182 | /* it's the next argument */ | |
183 | precision = va_arg(args, int); | |
184 | } | |
185 | if (precision < 0) | |
186 | precision = 0; | |
187 | } | |
188 | ||
189 | /* get the conversion qualifier */ | |
190 | qualifier = -1; | |
191 | if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') { | |
192 | qualifier = *fmt; | |
193 | ++fmt; | |
194 | } | |
195 | ||
196 | /* default base */ | |
197 | base = 10; | |
198 | ||
199 | switch (*fmt) { | |
200 | case 'c': | |
201 | if (!(flags & LEFT)) | |
202 | while (--field_width > 0) | |
203 | *str++ = ' '; | |
204 | *str++ = (unsigned char)va_arg(args, int); | |
205 | while (--field_width > 0) | |
206 | *str++ = ' '; | |
207 | continue; | |
208 | ||
209 | case 's': | |
210 | s = va_arg(args, char *); | |
211 | len = strnlen(s, precision); | |
212 | ||
213 | if (!(flags & LEFT)) | |
214 | while (len < field_width--) | |
215 | *str++ = ' '; | |
216 | for (i = 0; i < len; ++i) | |
217 | *str++ = *s++; | |
218 | while (len < field_width--) | |
219 | *str++ = ' '; | |
220 | continue; | |
221 | ||
222 | case 'p': | |
223 | if (field_width == -1) { | |
224 | field_width = 2 * sizeof(void *); | |
225 | flags |= ZEROPAD; | |
226 | } | |
227 | str = number(str, | |
228 | (unsigned long)va_arg(args, void *), 16, | |
229 | field_width, precision, flags); | |
230 | continue; | |
231 | ||
232 | case 'n': | |
233 | if (qualifier == 'l') { | |
234 | long *ip = va_arg(args, long *); | |
235 | *ip = (str - buf); | |
236 | } else { | |
237 | int *ip = va_arg(args, int *); | |
238 | *ip = (str - buf); | |
239 | } | |
240 | continue; | |
241 | ||
242 | case '%': | |
243 | *str++ = '%'; | |
244 | continue; | |
245 | ||
246 | /* integer number formats - set up the flags and "break" */ | |
247 | case 'o': | |
248 | base = 8; | |
249 | break; | |
250 | ||
251 | case 'x': | |
252 | flags |= SMALL; | |
253 | case 'X': | |
254 | base = 16; | |
255 | break; | |
256 | ||
257 | case 'd': | |
258 | case 'i': | |
259 | flags |= SIGN; | |
260 | case 'u': | |
261 | break; | |
262 | ||
263 | default: | |
264 | *str++ = '%'; | |
265 | if (*fmt) | |
266 | *str++ = *fmt; | |
267 | else | |
268 | --fmt; | |
269 | continue; | |
270 | } | |
271 | if (qualifier == 'l') | |
272 | num = va_arg(args, unsigned long); | |
273 | else if (qualifier == 'h') { | |
274 | num = (unsigned short)va_arg(args, int); | |
275 | if (flags & SIGN) | |
276 | num = (short)num; | |
277 | } else if (flags & SIGN) | |
278 | num = va_arg(args, int); | |
279 | else | |
280 | num = va_arg(args, unsigned int); | |
281 | str = number(str, num, base, field_width, precision, flags); | |
282 | } | |
283 | *str = '\0'; | |
284 | return str - buf; | |
285 | } | |
286 | ||
287 | int sprintf(char *buf, const char *fmt, ...) | |
288 | { | |
289 | va_list args; | |
290 | int i; | |
291 | ||
292 | va_start(args, fmt); | |
293 | i = vsprintf(buf, fmt, args); | |
294 | va_end(args); | |
295 | return i; | |
296 | } | |
297 | ||
298 | int printf(const char *fmt, ...) | |
299 | { | |
300 | char printf_buf[1024]; | |
301 | va_list args; | |
302 | int printed; | |
303 | ||
304 | va_start(args, fmt); | |
305 | printed = vsprintf(printf_buf, fmt, args); | |
306 | va_end(args); | |
307 | ||
308 | puts(printf_buf); | |
309 | ||
310 | return printed; | |
311 | } |