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1 | /* | |
2 | * Copyright Patrick Powell 1995 | |
3 | * This code is based on code written by Patrick Powell (papowell@astart.com) | |
4 | * It may be used for any purpose as long as this notice remains intact | |
5 | * on all source code distributions | |
6 | */ | |
7 | ||
8 | /************************************************************** | |
9 | * Original: | |
10 | * Patrick Powell Tue Apr 11 09:48:21 PDT 1995 | |
11 | * A bombproof version of doprnt (dopr) included. | |
12 | * Sigh. This sort of thing is always nasty do deal with. Note that | |
13 | * the version here does not include floating point... | |
14 | * | |
15 | * snprintf() is used instead of sprintf() as it does limit checks | |
16 | * for string length. This covers a nasty loophole. | |
17 | * | |
18 | * The other functions are there to prevent NULL pointers from | |
19 | * causing nast effects. | |
20 | * | |
21 | * More Recently: | |
22 | * Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43 | |
23 | * This was ugly. It is still ugly. I opted out of floating point | |
24 | * numbers, but the formatter understands just about everything | |
25 | * from the normal C string format, at least as far as I can tell from | |
26 | * the Solaris 2.5 printf(3S) man page. | |
27 | * | |
28 | * Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1 | |
29 | * Ok, added some minimal floating point support, which means this | |
30 | * probably requires libm on most operating systems. Don't yet | |
31 | * support the exponent (e,E) and sigfig (g,G). Also, fmtint() | |
32 | * was pretty badly broken, it just wasn't being exercised in ways | |
33 | * which showed it, so that's been fixed. Also, formated the code | |
34 | * to mutt conventions, and removed dead code left over from the | |
35 | * original. Also, there is now a builtin-test, just compile with: | |
36 | * gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm | |
37 | * and run snprintf for results. | |
38 | * | |
39 | * Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i | |
40 | * The PGP code was using unsigned hexadecimal formats. | |
41 | * Unfortunately, unsigned formats simply didn't work. | |
42 | * | |
43 | * Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8 | |
44 | * The original code assumed that both snprintf() and vsnprintf() were | |
45 | * missing. Some systems only have snprintf() but not vsnprintf(), so | |
46 | * the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF. | |
47 | * | |
48 | * Andrew Tridgell (tridge@samba.org) Oct 1998 | |
49 | * fixed handling of %.0f | |
50 | * added test for HAVE_LONG_DOUBLE | |
51 | * | |
52 | * tridge@samba.org, idra@samba.org, April 2001 | |
53 | * got rid of fcvt code (twas buggy and made testing harder) | |
54 | * added C99 semantics | |
55 | * | |
56 | * date: 2002/12/19 19:56:31; author: herb; state: Exp; lines: +2 -0 | |
57 | * actually print args for %g and %e | |
58 | * | |
59 | * date: 2002/06/03 13:37:52; author: jmcd; state: Exp; lines: +8 -0 | |
60 | * Since includes.h isn't included here, VA_COPY has to be defined here. I don't | |
61 | * see any include file that is guaranteed to be here, so I'm defining it | |
62 | * locally. Fixes AIX and Solaris builds. | |
63 | * | |
64 | * date: 2002/06/03 03:07:24; author: tridge; state: Exp; lines: +5 -13 | |
65 | * put the ifdef for HAVE_VA_COPY in one place rather than in lots of | |
66 | * functions | |
67 | * | |
68 | * date: 2002/05/17 14:51:22; author: jmcd; state: Exp; lines: +21 -4 | |
69 | * Fix usage of va_list passed as an arg. Use __va_copy before using it | |
70 | * when it exists. | |
71 | * | |
72 | * date: 2002/04/16 22:38:04; author: idra; state: Exp; lines: +20 -14 | |
73 | * Fix incorrect zpadlen handling in fmtfp. | |
74 | * Thanks to Ollie Oldham <ollie.oldham@metro-optix.com> for spotting it. | |
75 | * few mods to make it easier to compile the tests. | |
76 | * addedd the "Ollie" test to the floating point ones. | |
77 | * | |
78 | * Martin Pool (mbp@samba.org) April 2003 | |
79 | * Remove NO_CONFIG_H so that the test case can be built within a source | |
80 | * tree with less trouble. | |
81 | * Remove unnecessary SAFE_FREE() definition. | |
82 | * | |
83 | * Martin Pool (mbp@samba.org) May 2003 | |
84 | * Put in a prototype for dummy_snprintf() to quiet compiler warnings. | |
85 | * | |
86 | * Move #endif to make sure VA_COPY, LDOUBLE, etc are defined even | |
87 | * if the C library has some snprintf functions already. | |
88 | * | |
89 | * Damien Miller (djm@mindrot.org) Jan 2007 | |
90 | * Fix integer overflows in return value. | |
91 | * Make formatting quite a bit faster by inlining dopr_outch() | |
92 | * | |
93 | **************************************************************/ | |
94 | ||
95 | #include "includes.h" | |
96 | ||
97 | #if defined(BROKEN_SNPRINTF) /* For those with broken snprintf() */ | |
98 | # undef HAVE_SNPRINTF | |
99 | # undef HAVE_VSNPRINTF | |
100 | #endif | |
101 | ||
102 | #ifndef VA_COPY | |
103 | # ifdef HAVE_VA_COPY | |
104 | # define VA_COPY(dest, src) va_copy(dest, src) | |
105 | # else | |
106 | # ifdef HAVE___VA_COPY | |
107 | # define VA_COPY(dest, src) __va_copy(dest, src) | |
108 | # else | |
109 | # define VA_COPY(dest, src) (dest) = (src) | |
110 | # endif | |
111 | # endif | |
112 | #endif | |
113 | ||
114 | #if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) | |
115 | ||
116 | #include <ctype.h> | |
117 | #include <stdarg.h> | |
118 | #include <stdlib.h> | |
119 | #include <string.h> | |
120 | #include <limits.h> | |
121 | #include <errno.h> | |
122 | ||
123 | #ifdef HAVE_LONG_DOUBLE | |
124 | # define LDOUBLE long double | |
125 | #else | |
126 | # define LDOUBLE double | |
127 | #endif | |
128 | ||
129 | #ifdef HAVE_LONG_LONG | |
130 | # define LLONG long long | |
131 | #else | |
132 | # define LLONG long | |
133 | #endif | |
134 | ||
135 | /* | |
136 | * dopr(): poor man's version of doprintf | |
137 | */ | |
138 | ||
139 | /* format read states */ | |
140 | #define DP_S_DEFAULT 0 | |
141 | #define DP_S_FLAGS 1 | |
142 | #define DP_S_MIN 2 | |
143 | #define DP_S_DOT 3 | |
144 | #define DP_S_MAX 4 | |
145 | #define DP_S_MOD 5 | |
146 | #define DP_S_CONV 6 | |
147 | #define DP_S_DONE 7 | |
148 | ||
149 | /* format flags - Bits */ | |
150 | #define DP_F_MINUS (1 << 0) | |
151 | #define DP_F_PLUS (1 << 1) | |
152 | #define DP_F_SPACE (1 << 2) | |
153 | #define DP_F_NUM (1 << 3) | |
154 | #define DP_F_ZERO (1 << 4) | |
155 | #define DP_F_UP (1 << 5) | |
156 | #define DP_F_UNSIGNED (1 << 6) | |
157 | ||
158 | /* Conversion Flags */ | |
159 | #define DP_C_SHORT 1 | |
160 | #define DP_C_LONG 2 | |
161 | #define DP_C_LDOUBLE 3 | |
162 | #define DP_C_LLONG 4 | |
163 | ||
164 | #define char_to_int(p) ((p)- '0') | |
165 | #ifndef MAX | |
166 | # define MAX(p,q) (((p) >= (q)) ? (p) : (q)) | |
167 | #endif | |
168 | ||
169 | #define DOPR_OUTCH(buf, pos, buflen, thechar) \ | |
170 | do { \ | |
171 | if (pos + 1 >= INT_MAX) { \ | |
172 | errno = ERANGE; \ | |
173 | return -1; \ | |
174 | } \ | |
175 | if (pos < buflen) \ | |
176 | buf[pos] = thechar; \ | |
177 | (pos)++; \ | |
178 | } while (0) | |
179 | ||
180 | static int dopr(char *buffer, size_t maxlen, const char *format, | |
181 | va_list args_in); | |
182 | static int fmtstr(char *buffer, size_t *currlen, size_t maxlen, | |
183 | char *value, int flags, int min, int max); | |
184 | static int fmtint(char *buffer, size_t *currlen, size_t maxlen, | |
185 | LLONG value, int base, int min, int max, int flags); | |
186 | static int fmtfp(char *buffer, size_t *currlen, size_t maxlen, | |
187 | LDOUBLE fvalue, int min, int max, int flags); | |
188 | ||
189 | static int | |
190 | dopr(char *buffer, size_t maxlen, const char *format, va_list args_in) | |
191 | { | |
192 | char ch; | |
193 | LLONG value; | |
194 | LDOUBLE fvalue; | |
195 | char *strvalue; | |
196 | int min; | |
197 | int max; | |
198 | int state; | |
199 | int flags; | |
200 | int cflags; | |
201 | size_t currlen; | |
202 | va_list args; | |
203 | ||
204 | VA_COPY(args, args_in); | |
205 | ||
206 | state = DP_S_DEFAULT; | |
207 | currlen = flags = cflags = min = 0; | |
208 | max = -1; | |
209 | ch = *format++; | |
210 | ||
211 | while (state != DP_S_DONE) { | |
212 | if (ch == '\0') | |
213 | state = DP_S_DONE; | |
214 | ||
215 | switch(state) { | |
216 | case DP_S_DEFAULT: | |
217 | if (ch == '%') | |
218 | state = DP_S_FLAGS; | |
219 | else | |
220 | DOPR_OUTCH(buffer, currlen, maxlen, ch); | |
221 | ch = *format++; | |
222 | break; | |
223 | case DP_S_FLAGS: | |
224 | switch (ch) { | |
225 | case '-': | |
226 | flags |= DP_F_MINUS; | |
227 | ch = *format++; | |
228 | break; | |
229 | case '+': | |
230 | flags |= DP_F_PLUS; | |
231 | ch = *format++; | |
232 | break; | |
233 | case ' ': | |
234 | flags |= DP_F_SPACE; | |
235 | ch = *format++; | |
236 | break; | |
237 | case '#': | |
238 | flags |= DP_F_NUM; | |
239 | ch = *format++; | |
240 | break; | |
241 | case '0': | |
242 | flags |= DP_F_ZERO; | |
243 | ch = *format++; | |
244 | break; | |
245 | default: | |
246 | state = DP_S_MIN; | |
247 | break; | |
248 | } | |
249 | break; | |
250 | case DP_S_MIN: | |
251 | if (isdigit((unsigned char)ch)) { | |
252 | min = 10*min + char_to_int (ch); | |
253 | ch = *format++; | |
254 | } else if (ch == '*') { | |
255 | min = va_arg (args, int); | |
256 | ch = *format++; | |
257 | state = DP_S_DOT; | |
258 | } else { | |
259 | state = DP_S_DOT; | |
260 | } | |
261 | break; | |
262 | case DP_S_DOT: | |
263 | if (ch == '.') { | |
264 | state = DP_S_MAX; | |
265 | ch = *format++; | |
266 | } else { | |
267 | state = DP_S_MOD; | |
268 | } | |
269 | break; | |
270 | case DP_S_MAX: | |
271 | if (isdigit((unsigned char)ch)) { | |
272 | if (max < 0) | |
273 | max = 0; | |
274 | max = 10*max + char_to_int (ch); | |
275 | ch = *format++; | |
276 | } else if (ch == '*') { | |
277 | max = va_arg (args, int); | |
278 | ch = *format++; | |
279 | state = DP_S_MOD; | |
280 | } else { | |
281 | state = DP_S_MOD; | |
282 | } | |
283 | break; | |
284 | case DP_S_MOD: | |
285 | switch (ch) { | |
286 | case 'h': | |
287 | cflags = DP_C_SHORT; | |
288 | ch = *format++; | |
289 | break; | |
290 | case 'l': | |
291 | cflags = DP_C_LONG; | |
292 | ch = *format++; | |
293 | if (ch == 'l') { /* It's a long long */ | |
294 | cflags = DP_C_LLONG; | |
295 | ch = *format++; | |
296 | } | |
297 | break; | |
298 | case 'L': | |
299 | cflags = DP_C_LDOUBLE; | |
300 | ch = *format++; | |
301 | break; | |
302 | default: | |
303 | break; | |
304 | } | |
305 | state = DP_S_CONV; | |
306 | break; | |
307 | case DP_S_CONV: | |
308 | switch (ch) { | |
309 | case 'd': | |
310 | case 'i': | |
311 | if (cflags == DP_C_SHORT) | |
312 | value = va_arg (args, int); | |
313 | else if (cflags == DP_C_LONG) | |
314 | value = va_arg (args, long int); | |
315 | else if (cflags == DP_C_LLONG) | |
316 | value = va_arg (args, LLONG); | |
317 | else | |
318 | value = va_arg (args, int); | |
319 | if (fmtint(buffer, &currlen, maxlen, | |
320 | value, 10, min, max, flags) == -1) | |
321 | return -1; | |
322 | break; | |
323 | case 'o': | |
324 | flags |= DP_F_UNSIGNED; | |
325 | if (cflags == DP_C_SHORT) | |
326 | value = va_arg (args, unsigned int); | |
327 | else if (cflags == DP_C_LONG) | |
328 | value = (long)va_arg (args, unsigned long int); | |
329 | else if (cflags == DP_C_LLONG) | |
330 | value = (long)va_arg (args, unsigned LLONG); | |
331 | else | |
332 | value = (long)va_arg (args, unsigned int); | |
333 | if (fmtint(buffer, &currlen, maxlen, value, | |
334 | 8, min, max, flags) == -1) | |
335 | return -1; | |
336 | break; | |
337 | case 'u': | |
338 | flags |= DP_F_UNSIGNED; | |
339 | if (cflags == DP_C_SHORT) | |
340 | value = va_arg (args, unsigned int); | |
341 | else if (cflags == DP_C_LONG) | |
342 | value = (long)va_arg (args, unsigned long int); | |
343 | else if (cflags == DP_C_LLONG) | |
344 | value = (LLONG)va_arg (args, unsigned LLONG); | |
345 | else | |
346 | value = (long)va_arg (args, unsigned int); | |
347 | if (fmtint(buffer, &currlen, maxlen, value, | |
348 | 10, min, max, flags) == -1) | |
349 | return -1; | |
350 | break; | |
351 | case 'X': | |
352 | flags |= DP_F_UP; | |
353 | case 'x': | |
354 | flags |= DP_F_UNSIGNED; | |
355 | if (cflags == DP_C_SHORT) | |
356 | value = va_arg (args, unsigned int); | |
357 | else if (cflags == DP_C_LONG) | |
358 | value = (long)va_arg (args, unsigned long int); | |
359 | else if (cflags == DP_C_LLONG) | |
360 | value = (LLONG)va_arg (args, unsigned LLONG); | |
361 | else | |
362 | value = (long)va_arg (args, unsigned int); | |
363 | if (fmtint(buffer, &currlen, maxlen, value, | |
364 | 16, min, max, flags) == -1) | |
365 | return -1; | |
366 | break; | |
367 | case 'f': | |
368 | if (cflags == DP_C_LDOUBLE) | |
369 | fvalue = va_arg (args, LDOUBLE); | |
370 | else | |
371 | fvalue = va_arg (args, double); | |
372 | if (fmtfp(buffer, &currlen, maxlen, fvalue, | |
373 | min, max, flags) == -1) | |
374 | return -1; | |
375 | break; | |
376 | case 'E': | |
377 | flags |= DP_F_UP; | |
378 | case 'e': | |
379 | if (cflags == DP_C_LDOUBLE) | |
380 | fvalue = va_arg (args, LDOUBLE); | |
381 | else | |
382 | fvalue = va_arg (args, double); | |
383 | if (fmtfp(buffer, &currlen, maxlen, fvalue, | |
384 | min, max, flags) == -1) | |
385 | return -1; | |
386 | break; | |
387 | case 'G': | |
388 | flags |= DP_F_UP; | |
389 | case 'g': | |
390 | if (cflags == DP_C_LDOUBLE) | |
391 | fvalue = va_arg (args, LDOUBLE); | |
392 | else | |
393 | fvalue = va_arg (args, double); | |
394 | if (fmtfp(buffer, &currlen, maxlen, fvalue, | |
395 | min, max, flags) == -1) | |
396 | return -1; | |
397 | break; | |
398 | case 'c': | |
399 | DOPR_OUTCH(buffer, currlen, maxlen, | |
400 | va_arg (args, int)); | |
401 | break; | |
402 | case 's': | |
403 | strvalue = va_arg (args, char *); | |
404 | if (!strvalue) strvalue = "(NULL)"; | |
405 | if (max == -1) { | |
406 | max = strlen(strvalue); | |
407 | } | |
408 | if (min > 0 && max >= 0 && min > max) max = min; | |
409 | if (fmtstr(buffer, &currlen, maxlen, | |
410 | strvalue, flags, min, max) == -1) | |
411 | return -1; | |
412 | break; | |
413 | case 'p': | |
414 | strvalue = va_arg (args, void *); | |
415 | if (fmtint(buffer, &currlen, maxlen, | |
416 | (long) strvalue, 16, min, max, flags) == -1) | |
417 | return -1; | |
418 | break; | |
419 | case 'n': | |
420 | if (cflags == DP_C_SHORT) { | |
421 | short int *num; | |
422 | num = va_arg (args, short int *); | |
423 | *num = currlen; | |
424 | } else if (cflags == DP_C_LONG) { | |
425 | long int *num; | |
426 | num = va_arg (args, long int *); | |
427 | *num = (long int)currlen; | |
428 | } else if (cflags == DP_C_LLONG) { | |
429 | LLONG *num; | |
430 | num = va_arg (args, LLONG *); | |
431 | *num = (LLONG)currlen; | |
432 | } else { | |
433 | int *num; | |
434 | num = va_arg (args, int *); | |
435 | *num = currlen; | |
436 | } | |
437 | break; | |
438 | case '%': | |
439 | DOPR_OUTCH(buffer, currlen, maxlen, ch); | |
440 | break; | |
441 | case 'w': | |
442 | /* not supported yet, treat as next char */ | |
443 | ch = *format++; | |
444 | break; | |
445 | default: | |
446 | /* Unknown, skip */ | |
447 | break; | |
448 | } | |
449 | ch = *format++; | |
450 | state = DP_S_DEFAULT; | |
451 | flags = cflags = min = 0; | |
452 | max = -1; | |
453 | break; | |
454 | case DP_S_DONE: | |
455 | break; | |
456 | default: | |
457 | /* hmm? */ | |
458 | break; /* some picky compilers need this */ | |
459 | } | |
460 | } | |
461 | if (maxlen != 0) { | |
462 | if (currlen < maxlen - 1) | |
463 | buffer[currlen] = '\0'; | |
464 | else if (maxlen > 0) | |
465 | buffer[maxlen - 1] = '\0'; | |
466 | } | |
467 | ||
468 | return currlen < INT_MAX ? (int)currlen : -1; | |
469 | } | |
470 | ||
471 | static int | |
472 | fmtstr(char *buffer, size_t *currlen, size_t maxlen, | |
473 | char *value, int flags, int min, int max) | |
474 | { | |
475 | int padlen, strln; /* amount to pad */ | |
476 | int cnt = 0; | |
477 | ||
478 | #ifdef DEBUG_SNPRINTF | |
479 | printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value); | |
480 | #endif | |
481 | if (value == 0) { | |
482 | value = "<NULL>"; | |
483 | } | |
484 | ||
485 | for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */ | |
486 | padlen = min - strln; | |
487 | if (padlen < 0) | |
488 | padlen = 0; | |
489 | if (flags & DP_F_MINUS) | |
490 | padlen = -padlen; /* Left Justify */ | |
491 | ||
492 | while ((padlen > 0) && (cnt < max)) { | |
493 | DOPR_OUTCH(buffer, *currlen, maxlen, ' '); | |
494 | --padlen; | |
495 | ++cnt; | |
496 | } | |
497 | while (*value && (cnt < max)) { | |
498 | DOPR_OUTCH(buffer, *currlen, maxlen, *value); | |
499 | *value++; | |
500 | ++cnt; | |
501 | } | |
502 | while ((padlen < 0) && (cnt < max)) { | |
503 | DOPR_OUTCH(buffer, *currlen, maxlen, ' '); | |
504 | ++padlen; | |
505 | ++cnt; | |
506 | } | |
507 | return 0; | |
508 | } | |
509 | ||
510 | /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */ | |
511 | ||
512 | static int | |
513 | fmtint(char *buffer, size_t *currlen, size_t maxlen, | |
514 | LLONG value, int base, int min, int max, int flags) | |
515 | { | |
516 | int signvalue = 0; | |
517 | unsigned LLONG uvalue; | |
518 | char convert[20]; | |
519 | int place = 0; | |
520 | int spadlen = 0; /* amount to space pad */ | |
521 | int zpadlen = 0; /* amount to zero pad */ | |
522 | int caps = 0; | |
523 | ||
524 | if (max < 0) | |
525 | max = 0; | |
526 | ||
527 | uvalue = value; | |
528 | ||
529 | if(!(flags & DP_F_UNSIGNED)) { | |
530 | if( value < 0 ) { | |
531 | signvalue = '-'; | |
532 | uvalue = -value; | |
533 | } else { | |
534 | if (flags & DP_F_PLUS) /* Do a sign (+/i) */ | |
535 | signvalue = '+'; | |
536 | else if (flags & DP_F_SPACE) | |
537 | signvalue = ' '; | |
538 | } | |
539 | } | |
540 | ||
541 | if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */ | |
542 | ||
543 | do { | |
544 | convert[place++] = | |
545 | (caps? "0123456789ABCDEF":"0123456789abcdef") | |
546 | [uvalue % (unsigned)base ]; | |
547 | uvalue = (uvalue / (unsigned)base ); | |
548 | } while(uvalue && (place < 20)); | |
549 | if (place == 20) place--; | |
550 | convert[place] = 0; | |
551 | ||
552 | zpadlen = max - place; | |
553 | spadlen = min - MAX (max, place) - (signvalue ? 1 : 0); | |
554 | if (zpadlen < 0) zpadlen = 0; | |
555 | if (spadlen < 0) spadlen = 0; | |
556 | if (flags & DP_F_ZERO) { | |
557 | zpadlen = MAX(zpadlen, spadlen); | |
558 | spadlen = 0; | |
559 | } | |
560 | if (flags & DP_F_MINUS) | |
561 | spadlen = -spadlen; /* Left Justifty */ | |
562 | ||
563 | #ifdef DEBUG_SNPRINTF | |
564 | printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n", | |
565 | zpadlen, spadlen, min, max, place); | |
566 | #endif | |
567 | ||
568 | /* Spaces */ | |
569 | while (spadlen > 0) { | |
570 | DOPR_OUTCH(buffer, *currlen, maxlen, ' '); | |
571 | --spadlen; | |
572 | } | |
573 | ||
574 | /* Sign */ | |
575 | if (signvalue) | |
576 | DOPR_OUTCH(buffer, *currlen, maxlen, signvalue); | |
577 | ||
578 | /* Zeros */ | |
579 | if (zpadlen > 0) { | |
580 | while (zpadlen > 0) { | |
581 | DOPR_OUTCH(buffer, *currlen, maxlen, '0'); | |
582 | --zpadlen; | |
583 | } | |
584 | } | |
585 | ||
586 | /* Digits */ | |
587 | while (place > 0) { | |
588 | --place; | |
589 | DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]); | |
590 | } | |
591 | ||
592 | /* Left Justified spaces */ | |
593 | while (spadlen < 0) { | |
594 | DOPR_OUTCH(buffer, *currlen, maxlen, ' '); | |
595 | ++spadlen; | |
596 | } | |
597 | return 0; | |
598 | } | |
599 | ||
600 | static LDOUBLE abs_val(LDOUBLE value) | |
601 | { | |
602 | LDOUBLE result = value; | |
603 | ||
604 | if (value < 0) | |
605 | result = -value; | |
606 | ||
607 | return result; | |
608 | } | |
609 | ||
610 | static LDOUBLE POW10(int val) | |
611 | { | |
612 | LDOUBLE result = 1; | |
613 | ||
614 | while (val) { | |
615 | result *= 10; | |
616 | val--; | |
617 | } | |
618 | ||
619 | return result; | |
620 | } | |
621 | ||
622 | static LLONG ROUND(LDOUBLE value) | |
623 | { | |
624 | LLONG intpart; | |
625 | ||
626 | intpart = (LLONG)value; | |
627 | value = value - intpart; | |
628 | if (value >= 0.5) intpart++; | |
629 | ||
630 | return intpart; | |
631 | } | |
632 | ||
633 | /* a replacement for modf that doesn't need the math library. Should | |
634 | be portable, but slow */ | |
635 | static double my_modf(double x0, double *iptr) | |
636 | { | |
637 | int i; | |
638 | long l; | |
639 | double x = x0; | |
640 | double f = 1.0; | |
641 | ||
642 | for (i=0;i<100;i++) { | |
643 | l = (long)x; | |
644 | if (l <= (x+1) && l >= (x-1)) break; | |
645 | x *= 0.1; | |
646 | f *= 10.0; | |
647 | } | |
648 | ||
649 | if (i == 100) { | |
650 | /* | |
651 | * yikes! the number is beyond what we can handle. | |
652 | * What do we do? | |
653 | */ | |
654 | (*iptr) = 0; | |
655 | return 0; | |
656 | } | |
657 | ||
658 | if (i != 0) { | |
659 | double i2; | |
660 | double ret; | |
661 | ||
662 | ret = my_modf(x0-l*f, &i2); | |
663 | (*iptr) = l*f + i2; | |
664 | return ret; | |
665 | } | |
666 | ||
667 | (*iptr) = l; | |
668 | return x - (*iptr); | |
669 | } | |
670 | ||
671 | ||
672 | static int | |
673 | fmtfp (char *buffer, size_t *currlen, size_t maxlen, | |
674 | LDOUBLE fvalue, int min, int max, int flags) | |
675 | { | |
676 | int signvalue = 0; | |
677 | double ufvalue; | |
678 | char iconvert[311]; | |
679 | char fconvert[311]; | |
680 | int iplace = 0; | |
681 | int fplace = 0; | |
682 | int padlen = 0; /* amount to pad */ | |
683 | int zpadlen = 0; | |
684 | int caps = 0; | |
685 | int idx; | |
686 | double intpart; | |
687 | double fracpart; | |
688 | double temp; | |
689 | ||
690 | /* | |
691 | * AIX manpage says the default is 0, but Solaris says the default | |
692 | * is 6, and sprintf on AIX defaults to 6 | |
693 | */ | |
694 | if (max < 0) | |
695 | max = 6; | |
696 | ||
697 | ufvalue = abs_val (fvalue); | |
698 | ||
699 | if (fvalue < 0) { | |
700 | signvalue = '-'; | |
701 | } else { | |
702 | if (flags & DP_F_PLUS) { /* Do a sign (+/i) */ | |
703 | signvalue = '+'; | |
704 | } else { | |
705 | if (flags & DP_F_SPACE) | |
706 | signvalue = ' '; | |
707 | } | |
708 | } | |
709 | ||
710 | #if 0 | |
711 | if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */ | |
712 | #endif | |
713 | ||
714 | #if 0 | |
715 | if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */ | |
716 | #endif | |
717 | ||
718 | /* | |
719 | * Sorry, we only support 16 digits past the decimal because of our | |
720 | * conversion method | |
721 | */ | |
722 | if (max > 16) | |
723 | max = 16; | |
724 | ||
725 | /* We "cheat" by converting the fractional part to integer by | |
726 | * multiplying by a factor of 10 | |
727 | */ | |
728 | ||
729 | temp = ufvalue; | |
730 | my_modf(temp, &intpart); | |
731 | ||
732 | fracpart = ROUND((POW10(max)) * (ufvalue - intpart)); | |
733 | ||
734 | if (fracpart >= POW10(max)) { | |
735 | intpart++; | |
736 | fracpart -= POW10(max); | |
737 | } | |
738 | ||
739 | /* Convert integer part */ | |
740 | do { | |
741 | temp = intpart*0.1; | |
742 | my_modf(temp, &intpart); | |
743 | idx = (int) ((temp -intpart +0.05)* 10.0); | |
744 | /* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */ | |
745 | /* printf ("%llf, %f, %x\n", temp, intpart, idx); */ | |
746 | iconvert[iplace++] = | |
747 | (caps? "0123456789ABCDEF":"0123456789abcdef")[idx]; | |
748 | } while (intpart && (iplace < 311)); | |
749 | if (iplace == 311) iplace--; | |
750 | iconvert[iplace] = 0; | |
751 | ||
752 | /* Convert fractional part */ | |
753 | if (fracpart) | |
754 | { | |
755 | do { | |
756 | temp = fracpart*0.1; | |
757 | my_modf(temp, &fracpart); | |
758 | idx = (int) ((temp -fracpart +0.05)* 10.0); | |
759 | /* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */ | |
760 | /* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */ | |
761 | fconvert[fplace++] = | |
762 | (caps? "0123456789ABCDEF":"0123456789abcdef")[idx]; | |
763 | } while(fracpart && (fplace < 311)); | |
764 | if (fplace == 311) fplace--; | |
765 | } | |
766 | fconvert[fplace] = 0; | |
767 | ||
768 | /* -1 for decimal point, another -1 if we are printing a sign */ | |
769 | padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0); | |
770 | zpadlen = max - fplace; | |
771 | if (zpadlen < 0) zpadlen = 0; | |
772 | if (padlen < 0) | |
773 | padlen = 0; | |
774 | if (flags & DP_F_MINUS) | |
775 | padlen = -padlen; /* Left Justifty */ | |
776 | ||
777 | if ((flags & DP_F_ZERO) && (padlen > 0)) { | |
778 | if (signvalue) { | |
779 | DOPR_OUTCH(buffer, *currlen, maxlen, signvalue); | |
780 | --padlen; | |
781 | signvalue = 0; | |
782 | } | |
783 | while (padlen > 0) { | |
784 | DOPR_OUTCH(buffer, *currlen, maxlen, '0'); | |
785 | --padlen; | |
786 | } | |
787 | } | |
788 | while (padlen > 0) { | |
789 | DOPR_OUTCH(buffer, *currlen, maxlen, ' '); | |
790 | --padlen; | |
791 | } | |
792 | if (signvalue) | |
793 | DOPR_OUTCH(buffer, *currlen, maxlen, signvalue); | |
794 | ||
795 | while (iplace > 0) { | |
796 | --iplace; | |
797 | DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]); | |
798 | } | |
799 | ||
800 | #ifdef DEBUG_SNPRINTF | |
801 | printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen); | |
802 | #endif | |
803 | ||
804 | /* | |
805 | * Decimal point. This should probably use locale to find the correct | |
806 | * char to print out. | |
807 | */ | |
808 | if (max > 0) { | |
809 | DOPR_OUTCH(buffer, *currlen, maxlen, '.'); | |
810 | ||
811 | while (zpadlen > 0) { | |
812 | DOPR_OUTCH(buffer, *currlen, maxlen, '0'); | |
813 | --zpadlen; | |
814 | } | |
815 | ||
816 | while (fplace > 0) { | |
817 | --fplace; | |
818 | DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]); | |
819 | } | |
820 | } | |
821 | ||
822 | while (padlen < 0) { | |
823 | DOPR_OUTCH(buffer, *currlen, maxlen, ' '); | |
824 | ++padlen; | |
825 | } | |
826 | return 0; | |
827 | } | |
828 | #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */ | |
829 | ||
830 | #if !defined(HAVE_VSNPRINTF) | |
831 | int | |
832 | vsnprintf (char *str, size_t count, const char *fmt, va_list args) | |
833 | { | |
834 | return dopr(str, count, fmt, args); | |
835 | } | |
836 | #endif | |
837 | ||
838 | #if !defined(HAVE_SNPRINTF) | |
839 | int | |
840 | snprintf(char *str, size_t count, SNPRINTF_CONST char *fmt, ...) | |
841 | { | |
842 | size_t ret; | |
843 | va_list ap; | |
844 | ||
845 | va_start(ap, fmt); | |
846 | ret = vsnprintf(str, count, fmt, ap); | |
847 | va_end(ap); | |
848 | return ret; | |
849 | } | |
850 | #endif |