source: mainline/generic/src/debug/print.c@ 389f41e

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 389f41e was e16e036a, checked in by Martin Decky <martin@…>, 20 years ago

major build system revision (unfinished)
this patchset most definitively breaks a lot of things, be patient
  • Property mode set to 100644
File size: 9.9 KB
Line 
1/*
2 * Copyright (C) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <putchar.h>
30#include <print.h>
31#include <synch/spinlock.h>
32#include <arch/arg.h>
33#include <arch/asm.h>
34#include <arch/fmath.h>
35
36#include <arch.h>
37
38static char digits[] = "0123456789abcdef"; /**< Hexadecimal characters */
39static spinlock_t printflock; /**< printf spinlock */
40
41#define DEFAULT_DOUBLE_PRECISION 16
42#define DEFAULT_DOUBLE_BUFFER_SIZE 128
43
44
45/** Print NULL terminated string
46 *
47 * Print characters from str using putchar() until
48 * \\0 character is reached.
49 *
50 * @param str Characters to print.
51 *
52 */
53static void print_str(const char *str)
54{
55 int i = 0;
56 char c;
57
58 while (c = str[i++])
59 putchar(c);
60}
61
62
63/** Print hexadecimal digits
64 *
65 * Print fixed count of hexadecimal digits from
66 * the number num. The digits are printed in
67 * natural left-to-right order starting with
68 * the width-th digit.
69 *
70 * @param num Number containing digits.
71 * @param width Count of digits to print.
72 *
73 */
74static void print_fixed_hex(const __u64 num, const int width)
75{
76 int i;
77
78 for (i = width*8 - 4; i >= 0; i -= 4)
79 putchar(digits[(num>>i) & 0xf]);
80}
81
82
83/** Print number in given base
84 *
85 * Print significant digits of a number in given
86 * base.
87 *
88 * @param num Number to print.
89 * @param base Base to print the number in (should
90 * be in range 2 .. 16).
91 *
92 */
93static void print_number(const __native num, const unsigned int base)
94{
95 int val = num;
96 char d[sizeof(__native)*8+1]; /* this is good enough even for base == 2 */
97 int i = sizeof(__native)*8-1;
98
99 do {
100 d[i--] = digits[val % base];
101 } while (val /= base);
102
103 d[sizeof(__native)*8] = 0;
104 print_str(&d[i + 1]);
105}
106
107
108static void print_double(double num, __u8 modifier, __u16 precision)
109{
110 double intval,intval2;
111 int counter;
112 int exponent,exponenttmp;
113 unsigned char buf[DEFAULT_DOUBLE_BUFFER_SIZE];
114 unsigned long in1,in2;
115
116
117 if (fmath_is_nan(num)) {
118 print_str("NaN");
119 return;
120 }
121
122 if (num<0.0) {
123 putchar('-');
124 num=num*-1.0;
125 }
126
127
128 if (fmath_is_infinity(num)) {
129 print_str("Inf");
130 return;
131 }
132
133 if ((modifier=='E')||(modifier=='e')) {
134 intval2=fmath_fint(fmath_get_decimal_exponent(num),&intval);
135 exponent=intval;
136 if ((intval2<0.0)) exponent--;
137 num = num / ((fmath_dpow(10.0,exponent)));
138
139 print_double(num,modifier+1,precision); /* modifier+1 = E => F or e => f */
140 putchar(modifier);
141 if (exponent<0) {
142 putchar('-');
143 exponent*=-1;
144 }
145 print_number(exponent,10);
146 return;
147 }
148
149 /* TODO: rounding constant - when we got fraction >= 0.5, we must increment last printed number */
150
151 /*
152 * Here is a problem with cumulative error while printing big double values -> we will divide
153 * the number with a power of 10, print new number with better method for small numbers and
154 * then print decimal point at correct position.
155 */
156
157 fmath_fint(fmath_get_decimal_exponent(num),&intval);
158
159 exponent=(intval>0.0?intval:0);
160
161 precision+=exponent;
162
163 if (exponent>0) num = num / ((fmath_dpow(10.0,exponent)));
164
165 num=fmath_fint(num,&intval);
166
167 if (precision>0) {
168 counter=precision-1;
169 if (exponent>0) counter++;
170
171 if (counter>=DEFAULT_DOUBLE_BUFFER_SIZE) {
172 counter=DEFAULT_DOUBLE_BUFFER_SIZE;
173 }
174 exponenttmp=exponent;
175 while(counter>=0) {
176 num *= 10.0;
177 num = fmath_fint(num,&intval2);
178 buf[counter--]=((int)intval2)+'0';
179 exponenttmp--;
180 if ((exponenttmp==0)&&(counter>=0)) buf[counter--]='.';
181 }
182 counter=precision;
183 if ((exponent==0)&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) buf[counter]='.';
184 counter++;
185 } else {
186 counter=0;
187 }
188
189 in1=intval;
190 if (in1==0.0) {
191 if (counter<DEFAULT_DOUBLE_BUFFER_SIZE) buf[counter++]='0';
192 } else {
193 while(( in1>0 )&&(counter<DEFAULT_DOUBLE_BUFFER_SIZE)) {
194
195 in2=in1;
196 in1/=10;
197 buf[counter]=in2-in1*10 + '0';
198 counter++;
199 }
200 }
201
202 counter = (counter>=DEFAULT_DOUBLE_BUFFER_SIZE?DEFAULT_DOUBLE_BUFFER_SIZE:counter);
203 while (counter>0) {
204 putchar(buf[--counter]);
205 }
206 return;
207}
208
209
210/** General formatted text print
211 *
212 * Print text formatted according the fmt parameter
213 * and variant arguments. Each formatting directive
214 * begins with \% (percentage) character and one of the
215 * following character:
216 *
217 * \% Prints the percentage character.
218 *
219 * s The next variant argument is treated as char*
220 * and printed as a NULL terminated string.
221 *
222 * c The next variant argument is treated as a single char.
223 *
224 * p The next variant argument is treated as a maximum
225 * bit-width integer with respect to architecture
226 * and printed in full hexadecimal width.
227 *
228 * P As with 'p', but '0x' is prefixed.
229 *
230 * q The next variant argument is treated as a 64b integer
231 * and printed in full hexadecimal width.
232 *
233 * Q As with 'q', but '0x' is prefixed.
234 *
235 * l The next variant argument is treated as a 32b integer
236 * and printed in full hexadecimal width.
237 *
238 * L As with 'l', but '0x' is prefixed.
239 *
240 * w The next variant argument is treated as a 16b integer
241 * and printed in full hexadecimal width.
242 *
243 * W As with 'w', but '0x' is prefixed.
244 *
245 * b The next variant argument is treated as a 8b integer
246 * and printed in full hexadecimal width.
247 *
248 * B As with 'b', but '0x' is prefixed.
249 *
250 * d The next variant argument is treated as integer
251 * and printed in standard decimal format (only significant
252 * digits).
253 *
254 * x The next variant argument is treated as integer
255 * and printed in standard hexadecimal format (only significant
256 * digits).
257 *
258 * X As with 'x', but '0x' is prefixed.
259 *
260 * . The decimal number following period will be treated as precision
261 * for printing floating point numbers. One of 'e', 'E', 'f' or 'F'
262 * must follow.
263 *
264 * e The next variant argument is treated as double precision float
265 * and printed in exponent notation with only one digit before decimal point
266 * in specified precision. The exponent sign is printed as 'e'.
267 *
268 * E As with 'e', but the exponent sign is printed as 'E'.
269 *
270 * f The next variant argument is treated as double precision float
271 * and printed in decimal notation in specified precision.
272 *
273 * F As with 'f'.
274 *
275 * All other characters from fmt except the formatting directives
276 * are printed in verbatim.
277 *
278 * @param fmt Formatting NULL terminated string.
279 */
280void printf(const char *fmt, ...)
281{
282 int irqpri, i = 0;
283 va_list ap;
284 char c;
285
286 __u16 precision;
287
288 va_start(ap, fmt);
289
290 irqpri = interrupts_disable();
291 spinlock_lock(&printflock);
292
293 while (c = fmt[i++]) {
294 switch (c) {
295
296 /* control character */
297 case '%':
298 precision = DEFAULT_DOUBLE_PRECISION;
299 if (fmt[i]=='.') {
300 precision=0;
301 c=fmt[++i];
302 while((c>='0')&&(c<='9')) {
303 precision = precision*10 + c - '0';
304 c=fmt[++i];
305 }
306 }
307
308 switch (c = fmt[i++]) {
309
310 /* percentile itself */
311 case '%':
312 break;
313
314 /*
315 * String and character conversions.
316 */
317 case 's':
318 print_str(va_arg(ap, char_ptr));
319 goto loop;
320
321 case 'c':
322 c = (char) va_arg(ap, int);
323 break;
324
325 /*
326 * Hexadecimal conversions with fixed width.
327 */
328 case 'P':
329 print_str("0x");
330 case 'p':
331 print_fixed_hex(va_arg(ap, __native), sizeof(__native));
332 goto loop;
333
334 case 'Q':
335 print_str("0x");
336 case 'q':
337 print_fixed_hex(va_arg(ap, __u64), INT64);
338 goto loop;
339
340 case 'L':
341 print_str("0x");
342 case 'l':
343 print_fixed_hex(va_arg(ap, __native), INT32);
344 goto loop;
345
346 case 'W':
347 print_str("0x");
348 case 'w':
349 print_fixed_hex(va_arg(ap, __native), INT16);
350 goto loop;
351
352 case 'B':
353 print_str("0x");
354 case 'b':
355 print_fixed_hex(va_arg(ap, __native), INT8);
356 goto loop;
357
358 /*
359 * Floating point conversions.
360 */
361 case 'F':
362 print_double(va_arg(ap, double),'F',precision);
363 goto loop;
364
365 case 'f':
366 print_double(va_arg(ap, double),'f',precision);
367 goto loop;
368
369 case 'E':
370 print_double(va_arg(ap, double),'E',precision);
371 goto loop;
372 case 'e':
373 print_double(va_arg(ap, double),'e',precision);
374 goto loop;
375
376 /*
377 * Decimal and hexadecimal conversions.
378 */
379 case 'd':
380 print_number(va_arg(ap, __native), 10);
381 goto loop;
382
383 case 'X':
384 print_str("0x");
385 case 'x':
386 print_number(va_arg(ap, __native), 16);
387 goto loop;
388
389 /*
390 * Bad formatting.
391 */
392 default:
393 goto out;
394 }
395
396 default: putchar(c);
397 }
398
399loop:
400 ;
401 }
402
403out:
404 spinlock_unlock(&printflock);
405 interrupts_restore(irqpri);
406
407 va_end(ap);
408}
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