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, formatted 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 * added 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 goto fail;
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 goto fail;
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 goto fail;
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 goto fail;
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 goto fail;
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 goto fail;
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 goto fail;
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 goto fail;
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 goto fail;
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 va_end(args);
498 return currlen < INT_MAX ? (int)currlen : -1;
499 fail:
500 va_end(args);
501 return -1;
502 }
503
504 static int
fmtstr(char * buffer,size_t * currlen,size_t maxlen,char * value,int flags,int min,int max)505 fmtstr(char *buffer, size_t *currlen, size_t maxlen,
506 char *value, int flags, int min, int max)
507 {
508 int padlen, strln; /* amount to pad */
509 int cnt = 0;
510
511 #ifdef DEBUG_SNPRINTF
512 printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
513 #endif
514 if (value == 0) {
515 value = "<NULL>";
516 }
517
518 for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */
519 padlen = min - strln;
520 if (padlen < 0)
521 padlen = 0;
522 if (flags & DP_F_MINUS)
523 padlen = -padlen; /* Left Justify */
524
525 while ((padlen > 0) && (cnt < max)) {
526 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
527 --padlen;
528 ++cnt;
529 }
530 while (*value && (cnt < max)) {
531 DOPR_OUTCH(buffer, *currlen, maxlen, *value);
532 value++;
533 ++cnt;
534 }
535 while ((padlen < 0) && (cnt < max)) {
536 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
537 ++padlen;
538 ++cnt;
539 }
540 return 0;
541 }
542
543 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
544
545 static int
fmtint(char * buffer,size_t * currlen,size_t maxlen,intmax_t value,int base,int min,int max,int flags)546 fmtint(char *buffer, size_t *currlen, size_t maxlen,
547 intmax_t value, int base, int min, int max, int flags)
548 {
549 int signvalue = 0;
550 unsigned LLONG uvalue;
551 char convert[20];
552 int place = 0;
553 int spadlen = 0; /* amount to space pad */
554 int zpadlen = 0; /* amount to zero pad */
555 int caps = 0;
556
557 if (max < 0)
558 max = 0;
559
560 uvalue = value;
561
562 if(!(flags & DP_F_UNSIGNED)) {
563 if( value < 0 ) {
564 signvalue = '-';
565 uvalue = -value;
566 } else {
567 if (flags & DP_F_PLUS) /* Do a sign (+/i) */
568 signvalue = '+';
569 else if (flags & DP_F_SPACE)
570 signvalue = ' ';
571 }
572 }
573
574 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
575
576 do {
577 convert[place++] =
578 (caps? "0123456789ABCDEF":"0123456789abcdef")
579 [uvalue % (unsigned)base ];
580 uvalue = (uvalue / (unsigned)base );
581 } while(uvalue && (place < 20));
582 if (place == 20) place--;
583 convert[place] = 0;
584
585 zpadlen = max - place;
586 spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
587 if (zpadlen < 0) zpadlen = 0;
588 if (spadlen < 0) spadlen = 0;
589 if (flags & DP_F_ZERO) {
590 zpadlen = MAX(zpadlen, spadlen);
591 spadlen = 0;
592 }
593 if (flags & DP_F_MINUS)
594 spadlen = -spadlen; /* Left Justifty */
595
596 #ifdef DEBUG_SNPRINTF
597 printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
598 zpadlen, spadlen, min, max, place);
599 #endif
600
601 /* Spaces */
602 while (spadlen > 0) {
603 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
604 --spadlen;
605 }
606
607 /* Sign */
608 if (signvalue)
609 DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
610
611 /* Zeros */
612 if (zpadlen > 0) {
613 while (zpadlen > 0) {
614 DOPR_OUTCH(buffer, *currlen, maxlen, '0');
615 --zpadlen;
616 }
617 }
618
619 /* Digits */
620 while (place > 0) {
621 --place;
622 DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]);
623 }
624
625 /* Left Justified spaces */
626 while (spadlen < 0) {
627 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
628 ++spadlen;
629 }
630 return 0;
631 }
632
abs_val(LDOUBLE value)633 static LDOUBLE abs_val(LDOUBLE value)
634 {
635 LDOUBLE result = value;
636
637 if (value < 0)
638 result = -value;
639
640 return result;
641 }
642
POW10(int val)643 static LDOUBLE POW10(int val)
644 {
645 LDOUBLE result = 1;
646
647 while (val) {
648 result *= 10;
649 val--;
650 }
651
652 return result;
653 }
654
ROUND(LDOUBLE value)655 static LLONG ROUND(LDOUBLE value)
656 {
657 LLONG intpart;
658
659 intpart = (LLONG)value;
660 value = value - intpart;
661 if (value >= 0.5) intpart++;
662
663 return intpart;
664 }
665
666 /* a replacement for modf that doesn't need the math library. Should
667 be portable, but slow */
my_modf(double x0,double * iptr)668 static double my_modf(double x0, double *iptr)
669 {
670 int i;
671 long l;
672 double x = x0;
673 double f = 1.0;
674
675 for (i=0;i<100;i++) {
676 l = (long)x;
677 if (l <= (x+1) && l >= (x-1)) break;
678 x *= 0.1;
679 f *= 10.0;
680 }
681
682 if (i == 100) {
683 /*
684 * yikes! the number is beyond what we can handle.
685 * What do we do?
686 */
687 (*iptr) = 0;
688 return 0;
689 }
690
691 if (i != 0) {
692 double i2;
693 double ret;
694
695 ret = my_modf(x0-l*f, &i2);
696 (*iptr) = l*f + i2;
697 return ret;
698 }
699
700 (*iptr) = l;
701 return x - (*iptr);
702 }
703
704
705 static int
fmtfp(char * buffer,size_t * currlen,size_t maxlen,LDOUBLE fvalue,int min,int max,int flags)706 fmtfp (char *buffer, size_t *currlen, size_t maxlen,
707 LDOUBLE fvalue, int min, int max, int flags)
708 {
709 int signvalue = 0;
710 double ufvalue;
711 char iconvert[311];
712 char fconvert[311];
713 int iplace = 0;
714 int fplace = 0;
715 int padlen = 0; /* amount to pad */
716 int zpadlen = 0;
717 #if 0
718 int caps = 0;
719 #endif
720 int idx;
721 double intpart;
722 double fracpart;
723 double temp;
724
725 /*
726 * AIX manpage says the default is 0, but Solaris says the default
727 * is 6, and sprintf on AIX defaults to 6
728 */
729 if (max < 0)
730 max = 6;
731
732 ufvalue = abs_val (fvalue);
733
734 if (fvalue < 0) {
735 signvalue = '-';
736 } else {
737 if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
738 signvalue = '+';
739 } else {
740 if (flags & DP_F_SPACE)
741 signvalue = ' ';
742 }
743 }
744
745 #if 0
746 if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
747 #endif
748
749 #if 0
750 if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
751 #endif
752
753 /*
754 * Sorry, we only support 16 digits past the decimal because of our
755 * conversion method
756 */
757 if (max > 16)
758 max = 16;
759
760 /* We "cheat" by converting the fractional part to integer by
761 * multiplying by a factor of 10
762 */
763
764 temp = ufvalue;
765 my_modf(temp, &intpart);
766
767 fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
768
769 if (fracpart >= POW10(max)) {
770 intpart++;
771 fracpart -= POW10(max);
772 }
773
774 /* Convert integer part */
775 do {
776 temp = intpart*0.1;
777 my_modf(temp, &intpart);
778 idx = (int) ((temp -intpart +0.05)* 10.0);
779 /* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
780 /* printf ("%llf, %f, %x\n", temp, intpart, idx); */
781 iconvert[iplace++] = "0123456789"[idx];
782 } while (intpart && (iplace < 311));
783 if (iplace == 311) iplace--;
784 iconvert[iplace] = 0;
785
786 /* Convert fractional part */
787 if (fracpart)
788 {
789 do {
790 temp = fracpart*0.1;
791 my_modf(temp, &fracpart);
792 idx = (int) ((temp -fracpart +0.05)* 10.0);
793 /* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
794 /* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
795 fconvert[fplace++] = "0123456789"[idx];
796 } while(fracpart && (fplace < 311));
797 if (fplace == 311) fplace--;
798 }
799 fconvert[fplace] = 0;
800
801 /* -1 for decimal point, another -1 if we are printing a sign */
802 padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
803 zpadlen = max - fplace;
804 if (zpadlen < 0) zpadlen = 0;
805 if (padlen < 0)
806 padlen = 0;
807 if (flags & DP_F_MINUS)
808 padlen = -padlen; /* Left Justifty */
809
810 if ((flags & DP_F_ZERO) && (padlen > 0)) {
811 if (signvalue) {
812 DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
813 --padlen;
814 signvalue = 0;
815 }
816 while (padlen > 0) {
817 DOPR_OUTCH(buffer, *currlen, maxlen, '0');
818 --padlen;
819 }
820 }
821 while (padlen > 0) {
822 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
823 --padlen;
824 }
825 if (signvalue)
826 DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
827
828 while (iplace > 0) {
829 --iplace;
830 DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]);
831 }
832
833 #ifdef DEBUG_SNPRINTF
834 printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
835 #endif
836
837 /*
838 * Decimal point. This should probably use locale to find the correct
839 * char to print out.
840 */
841 if (max > 0) {
842 DOPR_OUTCH(buffer, *currlen, maxlen, '.');
843
844 while (zpadlen > 0) {
845 DOPR_OUTCH(buffer, *currlen, maxlen, '0');
846 --zpadlen;
847 }
848
849 while (fplace > 0) {
850 --fplace;
851 DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]);
852 }
853 }
854
855 while (padlen < 0) {
856 DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
857 ++padlen;
858 }
859 return 0;
860 }
861 #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
862
863 #if !defined(HAVE_VSNPRINTF)
864 int
vsnprintf(char * str,size_t count,const char * fmt,va_list args)865 vsnprintf (char *str, size_t count, const char *fmt, va_list args)
866 {
867 return dopr(str, count, fmt, args);
868 }
869 #endif
870
871 #if !defined(HAVE_SNPRINTF)
872 int
snprintf(char * str,size_t count,SNPRINTF_CONST char * fmt,...)873 snprintf(char *str, size_t count, SNPRINTF_CONST char *fmt, ...)
874 {
875 size_t ret;
876 va_list ap;
877
878 va_start(ap, fmt);
879 ret = vsnprintf(str, count, fmt, ap);
880 va_end(ap);
881 return ret;
882 }
883 #endif
884