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 #define DP_C_SIZE    5
164 #define DP_C_INTMAX  6
165 
166 #define char_to_int(p) ((p)- '0')
167 #ifndef MAX
168 # define MAX(p,q) (((p) >= (q)) ? (p) : (q))
169 #endif
170 
171 #define DOPR_OUTCH(buf, pos, buflen, thechar) \
172 	do { \
173 		if (pos + 1 >= INT_MAX) { \
174 			errno = ERANGE; \
175 			return -1; \
176 		} \
177 		if (pos < buflen) \
178 			buf[pos] = thechar; \
179 		(pos)++; \
180 	} while (0)
181 
182 static int dopr(char *buffer, size_t maxlen, const char *format,
183     va_list args_in);
184 static int fmtstr(char *buffer, size_t *currlen, size_t maxlen,
185     char *value, int flags, int min, int max);
186 static int fmtint(char *buffer, size_t *currlen, size_t maxlen,
187     intmax_t value, int base, int min, int max, int flags);
188 static int fmtfp(char *buffer, size_t *currlen, size_t maxlen,
189     LDOUBLE fvalue, int min, int max, int flags);
190 
191 static int
192 dopr(char *buffer, size_t maxlen, const char *format, va_list args_in)
193 {
194 	char ch;
195 	intmax_t value;
196 	LDOUBLE fvalue;
197 	char *strvalue;
198 	int min;
199 	int max;
200 	int state;
201 	int flags;
202 	int cflags;
203 	size_t currlen;
204 	va_list args;
205 
206 	VA_COPY(args, args_in);
207 
208 	state = DP_S_DEFAULT;
209 	currlen = flags = cflags = min = 0;
210 	max = -1;
211 	ch = *format++;
212 
213 	while (state != DP_S_DONE) {
214 		if (ch == '\0')
215 			state = DP_S_DONE;
216 
217 		switch(state) {
218 		case DP_S_DEFAULT:
219 			if (ch == '%')
220 				state = DP_S_FLAGS;
221 			else
222 				DOPR_OUTCH(buffer, currlen, maxlen, ch);
223 			ch = *format++;
224 			break;
225 		case DP_S_FLAGS:
226 			switch (ch) {
227 			case '-':
228 				flags |= DP_F_MINUS;
229 				ch = *format++;
230 				break;
231 			case '+':
232 				flags |= DP_F_PLUS;
233 				ch = *format++;
234 				break;
235 			case ' ':
236 				flags |= DP_F_SPACE;
237 				ch = *format++;
238 				break;
239 			case '#':
240 				flags |= DP_F_NUM;
241 				ch = *format++;
242 				break;
243 			case '0':
244 				flags |= DP_F_ZERO;
245 				ch = *format++;
246 				break;
247 			default:
248 				state = DP_S_MIN;
249 				break;
250 			}
251 			break;
252 		case DP_S_MIN:
253 			if (isdigit((unsigned char)ch)) {
254 				min = 10*min + char_to_int (ch);
255 				ch = *format++;
256 			} else if (ch == '*') {
257 				min = va_arg (args, int);
258 				ch = *format++;
259 				state = DP_S_DOT;
260 			} else {
261 				state = DP_S_DOT;
262 			}
263 			break;
264 		case DP_S_DOT:
265 			if (ch == '.') {
266 				state = DP_S_MAX;
267 				ch = *format++;
268 			} else {
269 				state = DP_S_MOD;
270 			}
271 			break;
272 		case DP_S_MAX:
273 			if (isdigit((unsigned char)ch)) {
274 				if (max < 0)
275 					max = 0;
276 				max = 10*max + char_to_int (ch);
277 				ch = *format++;
278 			} else if (ch == '*') {
279 				max = va_arg (args, int);
280 				ch = *format++;
281 				state = DP_S_MOD;
282 			} else {
283 				state = DP_S_MOD;
284 			}
285 			break;
286 		case DP_S_MOD:
287 			switch (ch) {
288 			case 'h':
289 				cflags = DP_C_SHORT;
290 				ch = *format++;
291 				break;
292 			case 'j':
293 				cflags = DP_C_INTMAX;
294 				ch = *format++;
295 				break;
296 			case 'l':
297 				cflags = DP_C_LONG;
298 				ch = *format++;
299 				if (ch == 'l') {	/* It's a long long */
300 					cflags = DP_C_LLONG;
301 					ch = *format++;
302 				}
303 				break;
304 			case 'L':
305 				cflags = DP_C_LDOUBLE;
306 				ch = *format++;
307 				break;
308 			case 'z':
309 				cflags = DP_C_SIZE;
310 				ch = *format++;
311 				break;
312 			default:
313 				break;
314 			}
315 			state = DP_S_CONV;
316 			break;
317 		case DP_S_CONV:
318 			switch (ch) {
319 			case 'd':
320 			case 'i':
321 				if (cflags == DP_C_SHORT)
322 					value = va_arg (args, int);
323 				else if (cflags == DP_C_LONG)
324 					value = va_arg (args, long int);
325 				else if (cflags == DP_C_LLONG)
326 					value = va_arg (args, LLONG);
327 				else if (cflags == DP_C_SIZE)
328 					value = va_arg (args, ssize_t);
329 				else if (cflags == DP_C_INTMAX)
330 					value = va_arg (args, intmax_t);
331 				else
332 					value = va_arg (args, int);
333 				if (fmtint(buffer, &currlen, maxlen,
334 				    value, 10, min, max, flags) == -1)
335 					return -1;
336 				break;
337 			case 'o':
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 = (long)va_arg (args, unsigned LLONG);
345 				else if (cflags == DP_C_SIZE)
346 					value = va_arg (args, size_t);
347 #ifdef notyet
348 				else if (cflags == DP_C_INTMAX)
349 					value = va_arg (args, uintmax_t);
350 #endif
351 				else
352 					value = (long)va_arg (args, unsigned int);
353 				if (fmtint(buffer, &currlen, maxlen, value,
354 				    8, min, max, flags) == -1)
355 					return -1;
356 				break;
357 			case 'u':
358 				flags |= DP_F_UNSIGNED;
359 				if (cflags == DP_C_SHORT)
360 					value = va_arg (args, unsigned int);
361 				else if (cflags == DP_C_LONG)
362 					value = (long)va_arg (args, unsigned long int);
363 				else if (cflags == DP_C_LLONG)
364 					value = (LLONG)va_arg (args, unsigned LLONG);
365 				else if (cflags == DP_C_SIZE)
366 					value = va_arg (args, size_t);
367 #ifdef notyet
368 				else if (cflags == DP_C_INTMAX)
369 					value = va_arg (args, uintmax_t);
370 #endif
371 				else
372 					value = (long)va_arg (args, unsigned int);
373 				if (fmtint(buffer, &currlen, maxlen, value,
374 				    10, min, max, flags) == -1)
375 					return -1;
376 				break;
377 			case 'X':
378 				flags |= DP_F_UP;
379 			case 'x':
380 				flags |= DP_F_UNSIGNED;
381 				if (cflags == DP_C_SHORT)
382 					value = va_arg (args, unsigned int);
383 				else if (cflags == DP_C_LONG)
384 					value = (long)va_arg (args, unsigned long int);
385 				else if (cflags == DP_C_LLONG)
386 					value = (LLONG)va_arg (args, unsigned LLONG);
387 				else if (cflags == DP_C_SIZE)
388 					value = va_arg (args, size_t);
389 #ifdef notyet
390 				else if (cflags == DP_C_INTMAX)
391 					value = va_arg (args, uintmax_t);
392 #endif
393 				else
394 					value = (long)va_arg (args, unsigned int);
395 				if (fmtint(buffer, &currlen, maxlen, value,
396 				    16, min, max, flags) == -1)
397 					return -1;
398 				break;
399 			case 'f':
400 				if (cflags == DP_C_LDOUBLE)
401 					fvalue = va_arg (args, LDOUBLE);
402 				else
403 					fvalue = va_arg (args, double);
404 				if (fmtfp(buffer, &currlen, maxlen, fvalue,
405 				    min, max, flags) == -1)
406 					return -1;
407 				break;
408 			case 'E':
409 				flags |= DP_F_UP;
410 			case 'e':
411 				if (cflags == DP_C_LDOUBLE)
412 					fvalue = va_arg (args, LDOUBLE);
413 				else
414 					fvalue = va_arg (args, double);
415 				if (fmtfp(buffer, &currlen, maxlen, fvalue,
416 				    min, max, flags) == -1)
417 					return -1;
418 				break;
419 			case 'G':
420 				flags |= DP_F_UP;
421 			case 'g':
422 				if (cflags == DP_C_LDOUBLE)
423 					fvalue = va_arg (args, LDOUBLE);
424 				else
425 					fvalue = va_arg (args, double);
426 				if (fmtfp(buffer, &currlen, maxlen, fvalue,
427 				    min, max, flags) == -1)
428 					return -1;
429 				break;
430 			case 'c':
431 				DOPR_OUTCH(buffer, currlen, maxlen,
432 				    va_arg (args, int));
433 				break;
434 			case 's':
435 				strvalue = va_arg (args, char *);
436 				if (!strvalue) strvalue = "(NULL)";
437 				if (max == -1) {
438 					max = strlen(strvalue);
439 				}
440 				if (min > 0 && max >= 0 && min > max) max = min;
441 				if (fmtstr(buffer, &currlen, maxlen,
442 				    strvalue, flags, min, max) == -1)
443 					return -1;
444 				break;
445 			case 'p':
446 				strvalue = va_arg (args, void *);
447 				if (fmtint(buffer, &currlen, maxlen,
448 				    (long) strvalue, 16, min, max, flags) == -1)
449 					return -1;
450 				break;
451 #if we_dont_want_this_in_openssh
452 			case 'n':
453 				if (cflags == DP_C_SHORT) {
454 					short int *num;
455 					num = va_arg (args, short int *);
456 					*num = currlen;
457 				} else if (cflags == DP_C_LONG) {
458 					long int *num;
459 					num = va_arg (args, long int *);
460 					*num = (long int)currlen;
461 				} else if (cflags == DP_C_LLONG) {
462 					LLONG *num;
463 					num = va_arg (args, LLONG *);
464 					*num = (LLONG)currlen;
465 				} else if (cflags == DP_C_SIZE) {
466 					ssize_t *num;
467 					num = va_arg (args, ssize_t *);
468 					*num = (ssize_t)currlen;
469 				} else if (cflags == DP_C_INTMAX) {
470 					intmax_t *num;
471 					num = va_arg (args, intmax_t *);
472 					*num = (intmax_t)currlen;
473 				} else {
474 					int *num;
475 					num = va_arg (args, int *);
476 					*num = currlen;
477 				}
478 				break;
479 #endif
480 			case '%':
481 				DOPR_OUTCH(buffer, currlen, maxlen, ch);
482 				break;
483 			case 'w':
484 				/* not supported yet, treat as next char */
485 				ch = *format++;
486 				break;
487 			default:
488 				/* Unknown, skip */
489 				break;
490 			}
491 			ch = *format++;
492 			state = DP_S_DEFAULT;
493 			flags = cflags = min = 0;
494 			max = -1;
495 			break;
496 		case DP_S_DONE:
497 			break;
498 		default:
499 			/* hmm? */
500 			break; /* some picky compilers need this */
501 		}
502 	}
503 	if (maxlen != 0) {
504 		if (currlen < maxlen - 1)
505 			buffer[currlen] = '\0';
506 		else if (maxlen > 0)
507 			buffer[maxlen - 1] = '\0';
508 	}
509 
510 	return currlen < INT_MAX ? (int)currlen : -1;
511 }
512 
513 static int
514 fmtstr(char *buffer, size_t *currlen, size_t maxlen,
515     char *value, int flags, int min, int max)
516 {
517 	int padlen, strln;     /* amount to pad */
518 	int cnt = 0;
519 
520 #ifdef DEBUG_SNPRINTF
521 	printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
522 #endif
523 	if (value == 0) {
524 		value = "<NULL>";
525 	}
526 
527 	for (strln = 0; strln < max && value[strln]; ++strln); /* strlen */
528 	padlen = min - strln;
529 	if (padlen < 0)
530 		padlen = 0;
531 	if (flags & DP_F_MINUS)
532 		padlen = -padlen; /* Left Justify */
533 
534 	while ((padlen > 0) && (cnt < max)) {
535 		DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
536 		--padlen;
537 		++cnt;
538 	}
539 	while (*value && (cnt < max)) {
540 		DOPR_OUTCH(buffer, *currlen, maxlen, *value);
541 		value++;
542 		++cnt;
543 	}
544 	while ((padlen < 0) && (cnt < max)) {
545 		DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
546 		++padlen;
547 		++cnt;
548 	}
549 	return 0;
550 }
551 
552 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
553 
554 static int
555 fmtint(char *buffer, size_t *currlen, size_t maxlen,
556     intmax_t value, int base, int min, int max, int flags)
557 {
558 	int signvalue = 0;
559 	unsigned LLONG uvalue;
560 	char convert[20];
561 	int place = 0;
562 	int spadlen = 0; /* amount to space pad */
563 	int zpadlen = 0; /* amount to zero pad */
564 	int caps = 0;
565 
566 	if (max < 0)
567 		max = 0;
568 
569 	uvalue = value;
570 
571 	if(!(flags & DP_F_UNSIGNED)) {
572 		if( value < 0 ) {
573 			signvalue = '-';
574 			uvalue = -value;
575 		} else {
576 			if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
577 				signvalue = '+';
578 			else if (flags & DP_F_SPACE)
579 				signvalue = ' ';
580 		}
581 	}
582 
583 	if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
584 
585 	do {
586 		convert[place++] =
587 			(caps? "0123456789ABCDEF":"0123456789abcdef")
588 			[uvalue % (unsigned)base  ];
589 		uvalue = (uvalue / (unsigned)base );
590 	} while(uvalue && (place < 20));
591 	if (place == 20) place--;
592 	convert[place] = 0;
593 
594 	zpadlen = max - place;
595 	spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
596 	if (zpadlen < 0) zpadlen = 0;
597 	if (spadlen < 0) spadlen = 0;
598 	if (flags & DP_F_ZERO) {
599 		zpadlen = MAX(zpadlen, spadlen);
600 		spadlen = 0;
601 	}
602 	if (flags & DP_F_MINUS)
603 		spadlen = -spadlen; /* Left Justifty */
604 
605 #ifdef DEBUG_SNPRINTF
606 	printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
607 	       zpadlen, spadlen, min, max, place);
608 #endif
609 
610 	/* Spaces */
611 	while (spadlen > 0) {
612 		DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
613 		--spadlen;
614 	}
615 
616 	/* Sign */
617 	if (signvalue)
618 		DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
619 
620 	/* Zeros */
621 	if (zpadlen > 0) {
622 		while (zpadlen > 0) {
623 			DOPR_OUTCH(buffer, *currlen, maxlen, '0');
624 			--zpadlen;
625 		}
626 	}
627 
628 	/* Digits */
629 	while (place > 0) {
630 		--place;
631 		DOPR_OUTCH(buffer, *currlen, maxlen, convert[place]);
632 	}
633 
634 	/* Left Justified spaces */
635 	while (spadlen < 0) {
636 		DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
637 		++spadlen;
638 	}
639 	return 0;
640 }
641 
642 static LDOUBLE abs_val(LDOUBLE value)
643 {
644 	LDOUBLE result = value;
645 
646 	if (value < 0)
647 		result = -value;
648 
649 	return result;
650 }
651 
652 static LDOUBLE POW10(int val)
653 {
654 	LDOUBLE result = 1;
655 
656 	while (val) {
657 		result *= 10;
658 		val--;
659 	}
660 
661 	return result;
662 }
663 
664 static LLONG ROUND(LDOUBLE value)
665 {
666 	LLONG intpart;
667 
668 	intpart = (LLONG)value;
669 	value = value - intpart;
670 	if (value >= 0.5) intpart++;
671 
672 	return intpart;
673 }
674 
675 /* a replacement for modf that doesn't need the math library. Should
676    be portable, but slow */
677 static double my_modf(double x0, double *iptr)
678 {
679 	int i;
680 	long l;
681 	double x = x0;
682 	double f = 1.0;
683 
684 	for (i=0;i<100;i++) {
685 		l = (long)x;
686 		if (l <= (x+1) && l >= (x-1)) break;
687 		x *= 0.1;
688 		f *= 10.0;
689 	}
690 
691 	if (i == 100) {
692 		/*
693 		 * yikes! the number is beyond what we can handle.
694 		 * What do we do?
695 		 */
696 		(*iptr) = 0;
697 		return 0;
698 	}
699 
700 	if (i != 0) {
701 		double i2;
702 		double ret;
703 
704 		ret = my_modf(x0-l*f, &i2);
705 		(*iptr) = l*f + i2;
706 		return ret;
707 	}
708 
709 	(*iptr) = l;
710 	return x - (*iptr);
711 }
712 
713 
714 static int
715 fmtfp (char *buffer, size_t *currlen, size_t maxlen,
716     LDOUBLE fvalue, int min, int max, int flags)
717 {
718 	int signvalue = 0;
719 	double ufvalue;
720 	char iconvert[311];
721 	char fconvert[311];
722 	int iplace = 0;
723 	int fplace = 0;
724 	int padlen = 0; /* amount to pad */
725 	int zpadlen = 0;
726 	int caps = 0;
727 	int idx;
728 	double intpart;
729 	double fracpart;
730 	double temp;
731 
732 	/*
733 	 * AIX manpage says the default is 0, but Solaris says the default
734 	 * is 6, and sprintf on AIX defaults to 6
735 	 */
736 	if (max < 0)
737 		max = 6;
738 
739 	ufvalue = abs_val (fvalue);
740 
741 	if (fvalue < 0) {
742 		signvalue = '-';
743 	} else {
744 		if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
745 			signvalue = '+';
746 		} else {
747 			if (flags & DP_F_SPACE)
748 				signvalue = ' ';
749 		}
750 	}
751 
752 #if 0
753 	if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
754 #endif
755 
756 #if 0
757 	 if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
758 #endif
759 
760 	/*
761 	 * Sorry, we only support 16 digits past the decimal because of our
762 	 * conversion method
763 	 */
764 	if (max > 16)
765 		max = 16;
766 
767 	/* We "cheat" by converting the fractional part to integer by
768 	 * multiplying by a factor of 10
769 	 */
770 
771 	temp = ufvalue;
772 	my_modf(temp, &intpart);
773 
774 	fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
775 
776 	if (fracpart >= POW10(max)) {
777 		intpart++;
778 		fracpart -= POW10(max);
779 	}
780 
781 	/* Convert integer part */
782 	do {
783 		temp = intpart*0.1;
784 		my_modf(temp, &intpart);
785 		idx = (int) ((temp -intpart +0.05)* 10.0);
786 		/* idx = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
787 		/* printf ("%llf, %f, %x\n", temp, intpart, idx); */
788 		iconvert[iplace++] =
789 			(caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
790 	} while (intpart && (iplace < 311));
791 	if (iplace == 311) iplace--;
792 	iconvert[iplace] = 0;
793 
794 	/* Convert fractional part */
795 	if (fracpart)
796 	{
797 		do {
798 			temp = fracpart*0.1;
799 			my_modf(temp, &fracpart);
800 			idx = (int) ((temp -fracpart +0.05)* 10.0);
801 			/* idx = (int) ((((temp/10) -fracpart) +0.05) *10); */
802 			/* printf ("%lf, %lf, %ld\n", temp, fracpart, idx ); */
803 			fconvert[fplace++] =
804 			(caps? "0123456789ABCDEF":"0123456789abcdef")[idx];
805 		} while(fracpart && (fplace < 311));
806 		if (fplace == 311) fplace--;
807 	}
808 	fconvert[fplace] = 0;
809 
810 	/* -1 for decimal point, another -1 if we are printing a sign */
811 	padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0);
812 	zpadlen = max - fplace;
813 	if (zpadlen < 0) zpadlen = 0;
814 	if (padlen < 0)
815 		padlen = 0;
816 	if (flags & DP_F_MINUS)
817 		padlen = -padlen; /* Left Justifty */
818 
819 	if ((flags & DP_F_ZERO) && (padlen > 0)) {
820 		if (signvalue) {
821 			DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
822 			--padlen;
823 			signvalue = 0;
824 		}
825 		while (padlen > 0) {
826 			DOPR_OUTCH(buffer, *currlen, maxlen, '0');
827 			--padlen;
828 		}
829 	}
830 	while (padlen > 0) {
831 		DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
832 		--padlen;
833 	}
834 	if (signvalue)
835 		DOPR_OUTCH(buffer, *currlen, maxlen, signvalue);
836 
837 	while (iplace > 0) {
838 		--iplace;
839 		DOPR_OUTCH(buffer, *currlen, maxlen, iconvert[iplace]);
840 	}
841 
842 #ifdef DEBUG_SNPRINTF
843 	printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
844 #endif
845 
846 	/*
847 	 * Decimal point.  This should probably use locale to find the correct
848 	 * char to print out.
849 	 */
850 	if (max > 0) {
851 		DOPR_OUTCH(buffer, *currlen, maxlen, '.');
852 
853 		while (zpadlen > 0) {
854 			DOPR_OUTCH(buffer, *currlen, maxlen, '0');
855 			--zpadlen;
856 		}
857 
858 		while (fplace > 0) {
859 			--fplace;
860 			DOPR_OUTCH(buffer, *currlen, maxlen, fconvert[fplace]);
861 		}
862 	}
863 
864 	while (padlen < 0) {
865 		DOPR_OUTCH(buffer, *currlen, maxlen, ' ');
866 		++padlen;
867 	}
868 	return 0;
869 }
870 #endif /* !defined(HAVE_SNPRINTF) || !defined(HAVE_VSNPRINTF) */
871 
872 #if !defined(HAVE_VSNPRINTF)
873 int
874 vsnprintf (char *str, size_t count, const char *fmt, va_list args)
875 {
876 	return dopr(str, count, fmt, args);
877 }
878 #endif
879 
880 #if !defined(HAVE_SNPRINTF)
881 int
882 snprintf(char *str, size_t count, SNPRINTF_CONST char *fmt, ...)
883 {
884 	size_t ret;
885 	va_list ap;
886 
887 	va_start(ap, fmt);
888 	ret = vsnprintf(str, count, fmt, ap);
889 	va_end(ap);
890 	return ret;
891 }
892 #endif
893