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 #if !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF)
103
104 #include <ctype.h>
105 #include <stdarg.h>
106 #include <stdlib.h>
107 #include <string.h>
108 #include <limits.h>
109 #include <errno.h>
110
111 #ifdef HAVE_LONG_DOUBLE
112 # define LDOUBLE long double
113 #else
114 # define LDOUBLE double
115 #endif
116
117 #ifdef HAVE_LONG_LONG
118 # define LLONG long long
119 #else
120 # define LLONG long
121 #endif
122
123 /*
124 * dopr(): poor man's version of doprintf
125 */
126
127 /* format read states */
128 #define DP_S_DEFAULT 0
129 #define DP_S_FLAGS 1
130 #define DP_S_MIN 2
131 #define DP_S_DOT 3
132 #define DP_S_MAX 4
133 #define DP_S_MOD 5
134 #define DP_S_CONV 6
135 #define DP_S_DONE 7
136
137 /* format flags - Bits */
138 #define DP_F_MINUS (1 << 0)
139 #define DP_F_PLUS (1 << 1)
140 #define DP_F_SPACE (1 << 2)
141 #define DP_F_NUM (1 << 3)
142 #define DP_F_ZERO (1 << 4)
143 #define DP_F_UP (1 << 5)
144 #define DP_F_UNSIGNED (1 << 6)
145
146 /* Conversion Flags */
147 #define DP_C_SHORT 1
148 #define DP_C_LONG 2
149 #define DP_C_LDOUBLE 3
150 #define DP_C_LLONG 4
151 #define DP_C_SIZE 5
152 #define DP_C_INTMAX 6
153
154 #define char_to_int(p) ((p)- '0')
155 #ifndef MAX
156 # define MAX(p,q) (((p) >= (q)) ? (p) : (q))
157 #endif
158
159 #define DOPR_OUTCH(buf, pos, buflen, thechar) \
160 do { \
161 if (pos + 1 >= INT_MAX) { \
162 errno = ERANGE; \
163 return -1; \
164 } \
165 if (pos < buflen) \
166 buf[pos] = thechar; \
167 (pos)++; \
168 } while (0)
169
170 static int dopr(char *buffer, size_t maxlen, const char *format,
171 va_list args_in);
172 static int fmtstr(char *buffer, size_t *currlen, size_t maxlen,
173 char *value, int flags, int min, int max);
174 static int fmtint(char *buffer, size_t *currlen, size_t maxlen,
175 intmax_t value, int base, int min, int max, int flags);
176 static int fmtfp(char *buffer, size_t *currlen, size_t maxlen,
177 LDOUBLE fvalue, int min, int max, int flags);
178
179 static int
dopr(char * buffer,size_t maxlen,const char * format,va_list args_in)180 dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
181 {
182 char ch;
183 intmax_t value;
184 LDOUBLE fvalue;
185 char *strvalue;
186 int min;
187 int max;
188 int state;
189 int flags;
190 int cflags;
191 size_t currlen;
192 va_list args;
193
194 VA_COPY(args, args_in);
195
196 state = DP_S_DEFAULT;
197 currlen = flags = cflags = min = 0;
198 max = -1;
199 ch = *format++;
200
201 while (state != DP_S_DONE) {
202 if (ch == '\0')
203 state = DP_S_DONE;
204
205 switch(state) {
206 case DP_S_DEFAULT:
207 if (ch == '%')
208 state = DP_S_FLAGS;
209 else
210 DOPR_OUTCH(buffer, currlen, maxlen, ch);
211 ch = *format++;
212 break;
213 case DP_S_FLAGS:
214 switch (ch) {
215 case '-':
216 flags |= DP_F_MINUS;
217 ch = *format++;
218 break;
219 case '+':
220 flags |= DP_F_PLUS;
221 ch = *format++;
222 break;
223 case ' ':
224 flags |= DP_F_SPACE;
225 ch = *format++;
226 break;
227 case '#':
228 flags |= DP_F_NUM;
229 ch = *format++;
230 break;
231 case '0':
232 flags |= DP_F_ZERO;
233 ch = *format++;
234 break;
235 default:
236 state = DP_S_MIN;
237 break;
238 }
239 break;
240 case DP_S_MIN:
241 if (isdigit((unsigned char)ch)) {
242 min = 10*min + char_to_int (ch);
243 ch = *format++;
244 } else if (ch == '*') {
245 min = va_arg (args, int);
246 ch = *format++;
247 state = DP_S_DOT;
248 } else {
249 state = DP_S_DOT;
250 }
251 break;
252 case DP_S_DOT:
253 if (ch == '.') {
254 state = DP_S_MAX;
255 ch = *format++;
256 } else {
257 state = DP_S_MOD;
258 }
259 break;
260 case DP_S_MAX:
261 if (isdigit((unsigned char)ch)) {
262 if (max < 0)
263 max = 0;
264 max = 10*max + char_to_int (ch);
265 ch = *format++;
266 } else if (ch == '*') {
267 max = va_arg (args, int);
268 ch = *format++;
269 state = DP_S_MOD;
270 } else {
271 state = DP_S_MOD;
272 }
273 break;
274 case DP_S_MOD:
275 switch (ch) {
276 case 'h':
277 cflags = DP_C_SHORT;
278 ch = *format++;
279 break;
280 case 'j':
281 cflags = DP_C_INTMAX;
282 ch = *format++;
283 break;
284 case 'l':
285 cflags = DP_C_LONG;
286 ch = *format++;
287 if (ch == 'l') { /* It's a long long */
288 cflags = DP_C_LLONG;
289 ch = *format++;
290 }
291 break;
292 case 'L':
293 cflags = DP_C_LDOUBLE;
294 ch = *format++;
295 break;
296 case 'z':
297 cflags = DP_C_SIZE;
298 ch = *format++;
299 break;
300 default:
301 break;
302 }
303 state = DP_S_CONV;
304 break;
305 case DP_S_CONV:
306 switch (ch) {
307 case 'd':
308 case 'i':
309 if (cflags == DP_C_SHORT)
310 value = va_arg (args, int);
311 else if (cflags == DP_C_LONG)
312 value = va_arg (args, long int);
313 else if (cflags == DP_C_LLONG)
314 value = va_arg (args, LLONG);
315 else if (cflags == DP_C_SIZE)
316 value = va_arg (args, ssize_t);
317 else if (cflags == DP_C_INTMAX)
318 value = va_arg (args, intmax_t);
319 else
320 value = va_arg (args, int);
321 if (fmtint(buffer, &currlen, maxlen,
322 value, 10, min, max, flags) == -1)
323 return -1;
324 break;
325 case 'o':
326 flags |= DP_F_UNSIGNED;
327 if (cflags == DP_C_SHORT)
328 value = va_arg (args, unsigned int);
329 else if (cflags == DP_C_LONG)
330 value = (long)va_arg (args, unsigned long int);
331 else if (cflags == DP_C_LLONG)
332 value = (long)va_arg (args, unsigned LLONG);
333 else if (cflags == DP_C_SIZE)
334 value = va_arg (args, size_t);
335 #ifdef notyet
336 else if (cflags == DP_C_INTMAX)
337 value = va_arg (args, uintmax_t);
338 #endif
339 else
340 value = (long)va_arg (args, unsigned int);
341 if (fmtint(buffer, &currlen, maxlen, value,
342 8, min, max, flags) == -1)
343 return -1;
344 break;
345 case 'u':
346 flags |= DP_F_UNSIGNED;
347 if (cflags == DP_C_SHORT)
348 value = va_arg (args, unsigned int);
349 else if (cflags == DP_C_LONG)
350 value = (long)va_arg (args, unsigned long int);
351 else if (cflags == DP_C_LLONG)
352 value = (LLONG)va_arg (args, unsigned LLONG);
353 else if (cflags == DP_C_SIZE)
354 value = va_arg (args, size_t);
355 #ifdef notyet
356 else if (cflags == DP_C_INTMAX)
357 value = va_arg (args, uintmax_t);
358 #endif
359 else
360 value = (long)va_arg (args, unsigned int);
361 if (fmtint(buffer, &currlen, maxlen, value,
362 10, min, max, flags) == -1)
363 return -1;
364 break;
365 case 'X':
366 flags |= DP_F_UP;
367 case 'x':
368 flags |= DP_F_UNSIGNED;
369 if (cflags == DP_C_SHORT)
370 value = va_arg (args, unsigned int);
371 else if (cflags == DP_C_LONG)
372 value = (long)va_arg (args, unsigned long int);
373 else if (cflags == DP_C_LLONG)
374 value = (LLONG)va_arg (args, unsigned LLONG);
375 else if (cflags == DP_C_SIZE)
376 value = va_arg (args, size_t);
377 #ifdef notyet
378 else if (cflags == DP_C_INTMAX)
379 value = va_arg (args, uintmax_t);
380 #endif
381 else
382 value = (long)va_arg (args, unsigned int);
383 if (fmtint(buffer, &currlen, maxlen, value,
384 16, min, max, flags) == -1)
385 return -1;
386 break;
387 case 'f':
388 if (cflags == DP_C_LDOUBLE)
389 fvalue = va_arg (args, LDOUBLE);
390 else
391 fvalue = va_arg (args, double);
392 if (fmtfp(buffer, &currlen, maxlen, fvalue,
393 min, max, flags) == -1)
394 return -1;
395 break;
396 case 'E':
397 flags |= DP_F_UP;
398 case 'e':
399 if (cflags == DP_C_LDOUBLE)
400 fvalue = va_arg (args, LDOUBLE);
401 else
402 fvalue = va_arg (args, double);
403 if (fmtfp(buffer, &currlen, maxlen, fvalue,
404 min, max, flags) == -1)
405 return -1;
406 break;
407 case 'G':
408 flags |= DP_F_UP;
409 case 'g':
410 if (cflags == DP_C_LDOUBLE)
411 fvalue = va_arg (args, LDOUBLE);
412 else
413 fvalue = va_arg (args, double);
414 if (fmtfp(buffer, &currlen, maxlen, fvalue,
415 min, max, flags) == -1)
416 return -1;
417 break;
418 case 'c':
419 DOPR_OUTCH(buffer, currlen, maxlen,
420 va_arg (args, int));
421 break;
422 case 's':
423 strvalue = va_arg (args, char *);
424 if (!strvalue) strvalue = "(NULL)";
425 if (max == -1) {
426 max = strlen(strvalue);
427 }
428 if (min > 0 && max >= 0 && min > max) max = min;
429 if (fmtstr(buffer, &currlen, maxlen,
430 strvalue, flags, min, max) == -1)
431 return -1;
432 break;
433 case 'p':
434 strvalue = va_arg (args, void *);
435 if (fmtint(buffer, &currlen, maxlen,
436 (long) strvalue, 16, min, max, flags) == -1)
437 return -1;
438 break;
439 #if we_dont_want_this_in_openssh
440 case 'n':
441 if (cflags == DP_C_SHORT) {
442 short int *num;
443 num = va_arg (args, short int *);
444 *num = currlen;
445 } else if (cflags == DP_C_LONG) {
446 long int *num;
447 num = va_arg (args, long int *);
448 *num = (long int)currlen;
449 } else if (cflags == DP_C_LLONG) {
450 LLONG *num;
451 num = va_arg (args, LLONG *);
452 *num = (LLONG)currlen;
453 } else if (cflags == DP_C_SIZE) {
454 ssize_t *num;
455 num = va_arg (args, ssize_t *);
456 *num = (ssize_t)currlen;
457 } else if (cflags == DP_C_INTMAX) {
458 intmax_t *num;
459 num = va_arg (args, intmax_t *);
460 *num = (intmax_t)currlen;
461 } else {
462 int *num;
463 num = va_arg (args, int *);
464 *num = currlen;
465 }
466 break;
467 #endif
468 case '%':
469 DOPR_OUTCH(buffer, currlen, maxlen, ch);
470 break;
471 case 'w':
472 /* not supported yet, treat as next char */
473 ch = *format++;
474 break;
475 default:
476 /* Unknown, skip */
477 break;
478 }
479 ch = *format++;
480 state = DP_S_DEFAULT;
481 flags = cflags = min = 0;
482 max = -1;
483 break;
484 case DP_S_DONE:
485 break;
486 default:
487 /* hmm? */
488 break; /* some picky compilers need this */
489 }
490 }
491 if (maxlen != 0) {
492 if (currlen < maxlen - 1)
493 buffer[currlen] = '\0';
494 else if (maxlen > 0)
495 buffer[maxlen - 1] = '\0';
496 }
497
498 return currlen < INT_MAX ? (int)currlen : -1;
499 }
500
501 static int
fmtstr(char * buffer,size_t * currlen,size_t maxlen,char * value,int flags,int min,int max)502 fmtstr(char *buffer, size_t *currlen, size_t maxlen,
503 char *value, int flags, int min, int max)
504 {
505 int padlen, strln; /* amount to pad */
506 int cnt = 0;
507
508 #ifdef DEBUG_SNPRINTF
509 printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
510 #endif
511 if (value == 0) {
512 value = "<NULL>";
513 }
514
515 for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */
516 padlen = min - strln;
517 if (padlen < 0)
518 padlen = 0;
519 if (flags & DP_F_MINUS)
520 padlen = -padlen; /* Left Justify */
521
522 while ((padlen > 0) && (cnt < max)) {
523 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
524 --padlen;
525 ++cnt;
526 }
527 while (*value && (cnt < max)) {
528 DOPR_OUTCH(buffer, *currlen, maxlen, *value);
529 value++;
530 ++cnt;
531 }
532 while ((padlen < 0) && (cnt < max)) {
533 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
534 ++padlen;
535 ++cnt;
536 }
537 return 0;
538 }
539
540 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
541
542 static int
fmtint(char * buffer,size_t * currlen,size_t maxlen,intmax_t value,int base,int min,int max,int flags)543 fmtint(char *buffer, size_t *currlen, size_t maxlen,
544 intmax_t value, int base, int min, int max, int flags)
545 {
546 int signvalue = 0;
547 unsigned LLONG uvalue;
548 char convert[20];
549 int place = 0;
550 int spadlen = 0; /* amount to space pad */
551 int zpadlen = 0; /* amount to zero pad */
552 int caps = 0;
553
554 if (max < 0)
555 max = 0;
556
557 uvalue = value;
558
559 if(!(flags & DP_F_UNSIGNED)) {
560 if( value < 0 ) {
561 signvalue = '-';
562 uvalue = -value;
563 } else {
564 if (flags & DP_F_PLUS) /* Do a sign (+/i) */
565 signvalue = '+';
566 else if (flags & DP_F_SPACE)
567 signvalue = ' ';
568 }
569 }
570
571 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
572
573 do {
574 convert[place++] =
575 (caps? "0123456789ABCDEF":"0123456789abcdef")
576 [uvalue % (unsigned)base ];
577 uvalue = (uvalue / (unsigned)base );
578 } while(uvalue && (place < 20));
579 if (place == 20) place--;
580 convert[place] = 0;
581
582 zpadlen = max - place;
583 spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
584 if (zpadlen < 0) zpadlen = 0;
585 if (spadlen < 0) spadlen = 0;
586 if (flags & DP_F_ZERO) {
587 zpadlen = MAX(zpadlen, spadlen);
588 spadlen = 0;
589 }
590 if (flags & DP_F_MINUS)
591 spadlen = -spadlen; /* Left Justifty */
592
593 #ifdef DEBUG_SNPRINTF
594 printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
595 zpadlen, spadlen, min, max, place);
596 #endif
597
598 /* Spaces */
599 while (spadlen > 0) {
600 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
601 --spadlen;
602 }
603
604 /* Sign */
605 if (signvalue)
606 DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
607
608 /* Zeros */
609 if (zpadlen > 0) {
610 while (zpadlen > 0) {
611 DOPR_OUTCH(buffer, *currlen, maxlen, '0');
612 --zpadlen;
613 }
614 }
615
616 /* Digits */
617 while (place > 0) {
618 --place;
619 DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]);
620 }
621
622 /* Left Justified spaces */
623 while (spadlen < 0) {
624 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
625 ++spadlen;
626 }
627 return 0;
628 }
629
abs_val(LDOUBLE value)630 static LDOUBLE abs_val(LDOUBLE value)
631 {
632 LDOUBLE result = value;
633
634 if (value < 0)
635 result = -value;
636
637 return result;
638 }
639
POW10(int val)640 static LDOUBLE POW10(int val)
641 {
642 LDOUBLE result = 1;
643
644 while (val) {
645 result *= 10;
646 val--;
647 }
648
649 return result;
650 }
651
ROUND(LDOUBLE value)652 static LLONG ROUND(LDOUBLE value)
653 {
654 LLONG intpart;
655
656 intpart = (LLONG)value;
657 value = value - intpart;
658 if (value >= 0.5) intpart++;
659
660 return intpart;
661 }
662
663 /* a replacement for modf that doesn't need the math library. Should
664 be portable, but slow */
my_modf(double x0,double * iptr)665 static double my_modf(double x0, double *iptr)
666 {
667 int i;
668 long l;
669 double x = x0;
670 double f = 1.0;
671
672 for (i=0;i<100;i++) {
673 l = (long)x;
674 if (l <= (x+1) && l >= (x-1)) break;
675 x *= 0.1;
676 f *= 10.0;
677 }
678
679 if (i == 100) {
680 /*
681 * yikes! the number is beyond what we can handle.
682 * What do we do?
683 */
684 (*iptr) = 0;
685 return 0;
686 }
687
688 if (i != 0) {
689 double i2;
690 double ret;
691
692 ret = my_modf(x0-l*f, &i2);
693 (*iptr) = l*f + i2;
694 return ret;
695 }
696
697 (*iptr) = l;
698 return x - (*iptr);
699 }
700
701
702 static int
fmtfp(char * buffer,size_t * currlen,size_t maxlen,LDOUBLE fvalue,int min,int max,int flags)703 fmtfp (char *buffer, size_t *currlen, size_t maxlen,
704 LDOUBLE fvalue, int min, int max, int flags)
705 {
706 int signvalue = 0;
707 double ufvalue;
708 char iconvert[311];
709 char fconvert[311];
710 int iplace = 0;
711 int fplace = 0;
712 int padlen = 0; /* amount to pad */
713 int zpadlen = 0;
714 int caps = 0;
715 int idx;
716 double intpart;
717 double fracpart;
718 double temp;
719
720 /*
721 * AIX manpage says the default is 0, but Solaris says the default
722 * is 6, and sprintf on AIX defaults to 6
723 */
724 if (max < 0)
725 max = 6;
726
727 ufvalue = abs_val (fvalue);
728
729 if (fvalue < 0) {
730 signvalue = '-';
731 } else {
732 if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
733 signvalue = '+';
734 } else {
735 if (flags & DP_F_SPACE)
736 signvalue = ' ';
737 }
738 }
739
740 #if 0
741 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
742 #endif
743
744 #if 0
745 if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
746 #endif
747
748 /*
749 * Sorry, we only support 16 digits past the decimal because of our
750 * conversion method
751 */
752 if (max > 16)
753 max = 16;
754
755 /* We "cheat" by converting the fractional part to integer by
756 * multiplying by a factor of 10
757 */
758
759 temp = ufvalue;
760 my_modf(temp, &intpart);
761
762 fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
763
764 if (fracpart >= POW10(max)) {
765 intpart++;
766 fracpart -= POW10(max);
767 }
768
769 /* Convert integer part */
770 do {
771 temp = intpart*0.1;
772 my_modf(temp, &intpart);
773 idx = (int) ((temp -intpart +0.05)* 10.0);
774 /* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
775 /* printf ("%llf, %f, %x\n", temp, intpart, idx); */
776 iconvert[iplace++] =
777 (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
778 } while (intpart && (iplace < 311));
779 if (iplace == 311) iplace--;
780 iconvert[iplace] = 0;
781
782 /* Convert fractional part */
783 if (fracpart)
784 {
785 do {
786 temp = fracpart*0.1;
787 my_modf(temp, &fracpart);
788 idx = (int) ((temp -fracpart +0.05)* 10.0);
789 /* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
790 /* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
791 fconvert[fplace++] =
792 (caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
793 } while(fracpart && (fplace < 311));
794 if (fplace == 311) fplace--;
795 }
796 fconvert[fplace] = 0;
797
798 /* -1 for decimal point, another -1 if we are printing a sign */
799 padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
800 zpadlen = max - fplace;
801 if (zpadlen < 0) zpadlen = 0;
802 if (padlen < 0)
803 padlen = 0;
804 if (flags & DP_F_MINUS)
805 padlen = -padlen; /* Left Justifty */
806
807 if ((flags & DP_F_ZERO) && (padlen > 0)) {
808 if (signvalue) {
809 DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
810 --padlen;
811 signvalue = 0;
812 }
813 while (padlen > 0) {
814 DOPR_OUTCH(buffer, *currlen, maxlen, '0');
815 --padlen;
816 }
817 }
818 while (padlen > 0) {
819 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
820 --padlen;
821 }
822 if (signvalue)
823 DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
824
825 while (iplace > 0) {
826 --iplace;
827 DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]);
828 }
829
830 #ifdef DEBUG_SNPRINTF
831 printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
832 #endif
833
834 /*
835 * Decimal point. This should probably use locale to find the correct
836 * char to print out.
837 */
838 if (max > 0) {
839 DOPR_OUTCH(buffer, *currlen, maxlen, '.');
840
841 while (zpadlen > 0) {
842 DOPR_OUTCH(buffer, *currlen, maxlen, '0');
843 --zpadlen;
844 }
845
846 while (fplace > 0) {
847 --fplace;
848 DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]);
849 }
850 }
851
852 while (padlen < 0) {
853 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
854 ++padlen;
855 }
856 return 0;
857 }
858 #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
859
860 #if !defined(HAVE_VSNPRINTF)
861 int
vsnprintf(char * str,size_t count,const char * fmt,va_list args)862 vsnprintf (char *str, size_t count, const char *fmt, va_list args)
863 {
864 return dopr(str, count, fmt, args);
865 }
866 #endif
867
868 #if !defined(HAVE_SNPRINTF)
869 int
snprintf(char * str,size_t count,SNPRINTF_CONST char * fmt,...)870 snprintf(char *str, size_t count, SNPRINTF_CONST char *fmt, ...)
871 {
872 size_t ret;
873 va_list ap;
874
875 va_start(ap, fmt);
876 ret = vsnprintf(str, count, fmt, ap);
877 va_end(ap);
878 return ret;
879 }
880 #endif
881