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Date:: Mon Apr 21 10:53:38 2003 UTC
Message:: Added missing prototype for dummy_snprintf().
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1 /*
2  * ngIRCd -- The Next Generation IRC Daemon
3  * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  * Please read the file COPYING, README and AUTHORS for more information.
10  *
11  * snprintf() and vsnprintf() replacement functions
12  */
13 
14 
15 #include "portab.h"
16 
17 static char UNUSED id[] = "$Id: vsnprintf.c,v 1.5 2003/04/21 10:53:38 alex Exp $";
18 
19 #include "imp.h"
20 
21 #include "exp.h"
22 
23 
24 /*
25  * snprintf.c: Copyright Patrick Powell 1995
26  * This code is based on code written by Patrick Powell (papowell@astart.com)
27  * It may be used for any purpose as long as this notice remains intact
28  * on all source code distributions
29  *
30  * Original: Patrick Powell Tue Apr 11 09:48:21 PDT 1995
31  * A bombproof version of doprnt (dopr) included.
32  * Sigh. This sort of thing is always nasty do deal with. Note that
33  * the version here does not include floating point...
34  *
35  * snprintf() is used instead of sprintf() as it does limit checks
36  * for string length. This covers a nasty loophole.
37  *
38  * The other functions are there to prevent NULL pointers from
39  * causing nast effects.
40  *
41  * More Recently:
42  *  Brandon Long <blong@fiction.net> 9/15/96 for mutt 0.43
43  *  This was ugly. It is still ugly. I opted out of floating point
44  *  numbers, but the formatter understands just about everything
45  *  from the normal C string format, at least as far as I can tell from
46  *  the Solaris 2.5 printf(3S) man page.
47  *
48  * Brandon Long <blong@fiction.net> 10/22/97 for mutt 0.87.1
49  *  Ok, added some minimal floating point support, which means this
50  *  probably requires libm on most operating systems. Don't yet
51  *  support the exponent (e,E) and sigfig (g,G). Also, fmtint()
52  *  was pretty badly broken, it just wasn't being exercised in ways
53  *  which showed it, so that's been fixed. Also, formated the code
54  *  to mutt conventions, and removed dead code left over from the
55  *  original. Also, there is now a builtin-test, just compile with:
56  *    gcc -DTEST_SNPRINTF -o snprintf snprintf.c -lm
57  *  and run snprintf for results.
58  * 
59  * Thomas Roessler <roessler@guug.de> 01/27/98 for mutt 0.89i
60  *  The PGP code was using unsigned hexadecimal formats. 
61  *  Unfortunately, unsigned formats simply didn't work.
62  *
63  * Michael Elkins <me@cs.hmc.edu> 03/05/98 for mutt 0.90.8
64  *  The original code assumed that both snprintf() and vsnprintf() were
65  *  missing. Some systems only have snprintf() but not vsnprintf(), so
66  *  the code is now broken down under HAVE_SNPRINTF and HAVE_VSNPRINTF.
67  *
68  * Andrew Tridgell <tridge@samba.org>, October 1998
69  *  fixed handling of %.0f
70  *  added test for HAVE_LONG_DOUBLE
71  *
72  * tridge@samba.org, idra@samba.org, April 2001
73  *  got rid of fcvt code (twas buggy and made testing harder)
74  *  added C99 semantics
75  *
76  * Alexander Barton, <alex@barton.de>, 2002-05-19
77  *  removed [v]asprintf() and C99 tests: not needed by ngIRCd.
78  */
79 
80 
81 #ifdef HAVE_STRING_H
82 #include <string.h>
83 #endif
84 #ifdef HAVE_STRINGS_H
85 #include <strings.h>
86 #endif
87 #ifdef HAVE_CTYPE_H
88 #include <ctype.h>
89 #endif
90 #include <sys/types.h>
91 #include <stdarg.h>
92 #ifdef HAVE_STDLIB_H
93 #include <stdlib.h>
94 #endif
95 
96 
97 #if defined(HAVE_SNPRINTF) && defined(HAVE_VSNPRINTF)
98 /* only include stdio.h if we are not re-defining snprintf or vsnprintf */
99 #include <stdio.h>
100 /* make the compiler happy with an empty file */
101 void dummy_snprintf PARAMS(( void ));
102 void dummy_snprintf PARAMS(( void )) { }
103 #else
104 
105 #ifdef HAVE_LONG_DOUBLE
106 #define LDOUBLE long double
107 #else
108 #define LDOUBLE double
109 #endif
110 
111 #ifdef HAVE_LONG_LONG
112 #define LLONG long long
113 #else
114 #define LLONG long
115 #endif
116 
117 static size_t dopr(char *buffer, size_t maxlen, const char *format, 
118 		   va_list args);
119 static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
120 		    char *value, int flags, int min, int max);
121 static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
122 		    long value, int base, int min, int max, int flags);
123 static void fmtfp(char *buffer, size_t *currlen, size_t maxlen,
124 		   LDOUBLE fvalue, int min, int max, int flags);
125 static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c);
126 
127 /*
128  * dopr(): poor man's version of doprintf
129  */
130 
131 /* format read states */
132 #define DP_S_DEFAULT 0
133 #define DP_S_FLAGS   1
134 #define DP_S_MIN     2
135 #define DP_S_DOT     3
136 #define DP_S_MAX     4
137 #define DP_S_MOD     5
138 #define DP_S_CONV    6
139 #define DP_S_DONE    7
140 
141 /* format flags - Bits */
142 #define DP_F_MINUS      (1 << 0)
143 #define DP_F_PLUS       (1 << 1)
144 #define DP_F_SPACE      (1 << 2)
145 #define DP_F_NUM	(1 << 3)
146 #define DP_F_ZERO       (1 << 4)
147 #define DP_F_UP	 (1 << 5)
148 #define DP_F_UNSIGNED   (1 << 6)
149 
150 /* Conversion Flags */
151 #define DP_C_SHORT   1
152 #define DP_C_LONG    2
153 #define DP_C_LDOUBLE 3
154 #define DP_C_LLONG   4
155 
156 #define char_to_int(p) ((p)- '0')
157 #ifndef MAX
158 #define MAX(p,q) (((p) >= (q)) ? (p) : (q))
159 #endif
160 
161 static size_t dopr(char *buffer, size_t maxlen, const char *format, va_list args)
162 {
163 	char ch;
164 	LLONG value;
165 	LDOUBLE fvalue;
166 	char *strvalue;
167 	int min;
168 	int max;
169 	int state;
170 	int flags;
171 	int cflags;
172 	size_t currlen;
173 	
174 	state = DP_S_DEFAULT;
175 	currlen = flags = cflags = min = 0;
176 	max = -1;
177 	ch = *format++;
178 	
179 	while (state != DP_S_DONE) {
180 		if (ch == '\0') 
181 			state = DP_S_DONE;
182 
183 		switch(state) {
184 		case DP_S_DEFAULT:
185 			if (ch == '%') 
186 				state = DP_S_FLAGS;
187 			else 
188 				dopr_outch (buffer, &currlen, maxlen, ch);
189 			ch = *format++;
190 			break;
191 		case DP_S_FLAGS:
192 			switch (ch) {
193 			case '-':
194 				flags |= DP_F_MINUS;
195 				ch = *format++;
196 				break;
197 			case '+':
198 				flags |= DP_F_PLUS;
199 				ch = *format++;
200 				break;
201 			case ' ':
202 				flags |= DP_F_SPACE;
203 				ch = *format++;
204 				break;
205 			case '#':
206 				flags |= DP_F_NUM;
207 				ch = *format++;
208 				break;
209 			case '0':
210 				flags |= DP_F_ZERO;
211 				ch = *format++;
212 				break;
213 			default:
214 				state = DP_S_MIN;
215 				break;
216 			}
217 			break;
218 		case DP_S_MIN:
219 			if (isdigit((unsigned char)ch)) {
220 				min = 10*min + char_to_int (ch);
221 				ch = *format++;
222 			} else if (ch == '*') {
223 				min = va_arg (args, int);
224 				ch = *format++;
225 				state = DP_S_DOT;
226 			} else {
227 				state = DP_S_DOT;
228 			}
229 			break;
230 		case DP_S_DOT:
231 			if (ch == '.') {
232 				state = DP_S_MAX;
233 				ch = *format++;
234 			} else { 
235 				state = DP_S_MOD;
236 			}
237 			break;
238 		case DP_S_MAX:
239 			if (isdigit((unsigned char)ch)) {
240 				if (max < 0)
241 					max = 0;
242 				max = 10*max + char_to_int (ch);
243 				ch = *format++;
244 			} else if (ch == '*') {
245 				max = va_arg (args, int);
246 				ch = *format++;
247 				state = DP_S_MOD;
248 			} else {
249 				state = DP_S_MOD;
250 			}
251 			break;
252 		case DP_S_MOD:
253 			switch (ch) {
254 			case 'h':
255 				cflags = DP_C_SHORT;
256 				ch = *format++;
257 				break;
258 			case 'l':
259 				cflags = DP_C_LONG;
260 				ch = *format++;
261 				if (ch == 'l') {	/* It's a long long */
262 					cflags = DP_C_LLONG;
263 					ch = *format++;
264 				}
265 				break;
266 			case 'L':
267 				cflags = DP_C_LDOUBLE;
268 				ch = *format++;
269 				break;
270 			default:
271 				break;
272 			}
273 			state = DP_S_CONV;
274 			break;
275 		case DP_S_CONV:
276 			switch (ch) {
277 			case 'd':
278 			case 'i':
279 				if (cflags == DP_C_SHORT) 
280 					value = va_arg (args, int);
281 				else if (cflags == DP_C_LONG)
282 					value = va_arg (args, long int);
283 				else if (cflags == DP_C_LLONG)
284 					value = va_arg (args, LLONG);
285 				else
286 					value = va_arg (args, int);
287 				fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
288 				break;
289 			case 'o':
290 				flags |= DP_F_UNSIGNED;
291 				if (cflags == DP_C_SHORT)
292 					value = va_arg (args, unsigned int);
293 				else if (cflags == DP_C_LONG)
294 					value = (long)va_arg (args, unsigned long int);
295 				else if (cflags == DP_C_LLONG)
296 					value = (long)va_arg (args, unsigned LLONG);
297 				else
298 					value = (long)va_arg (args, unsigned int);
299 				fmtint (buffer, &currlen, maxlen, value, 8, min, max, flags);
300 				break;
301 			case 'u':
302 				flags |= DP_F_UNSIGNED;
303 				if (cflags == DP_C_SHORT)
304 					value = va_arg (args, unsigned int);
305 				else if (cflags == DP_C_LONG)
306 					value = (long)va_arg (args, unsigned long int);
307 				else if (cflags == DP_C_LLONG)
308 					value = (LLONG)va_arg (args, unsigned LLONG);
309 				else
310 					value = (long)va_arg (args, unsigned int);
311 				fmtint (buffer, &currlen, maxlen, value, 10, min, max, flags);
312 				break;
313 			case 'X':
314 				flags |= DP_F_UP;
315 			case 'x':
316 				flags |= DP_F_UNSIGNED;
317 				if (cflags == DP_C_SHORT)
318 					value = va_arg (args, unsigned int);
319 				else if (cflags == DP_C_LONG)
320 					value = (long)va_arg (args, unsigned long int);
321 				else if (cflags == DP_C_LLONG)
322 					value = (LLONG)va_arg (args, unsigned LLONG);
323 				else
324 					value = (long)va_arg (args, unsigned int);
325 				fmtint (buffer, &currlen, maxlen, value, 16, min, max, flags);
326 				break;
327 			case 'f':
328 				if (cflags == DP_C_LDOUBLE)
329 					fvalue = va_arg (args, LDOUBLE);
330 				else
331 					fvalue = va_arg (args, double);
332 				/* um, floating point? */
333 				fmtfp (buffer, &currlen, maxlen, fvalue, min, max, flags);
334 				break;
335 			case 'E':
336 				flags |= DP_F_UP;
337 			case 'e':
338 				if (cflags == DP_C_LDOUBLE)
339 					fvalue = va_arg (args, LDOUBLE);
340 				else
341 					fvalue = va_arg (args, double);
342 				break;
343 			case 'G':
344 				flags |= DP_F_UP;
345 			case 'g':
346 				if (cflags == DP_C_LDOUBLE)
347 					fvalue = va_arg (args, LDOUBLE);
348 				else
349 					fvalue = va_arg (args, double);
350 				break;
351 			case 'c':
352 				dopr_outch (buffer, &currlen, maxlen, va_arg (args, int));
353 				break;
354 			case 's':
355 				strvalue = va_arg (args, char *);
356 				if (max == -1) {
357 					max = strlen(strvalue);
358 				}
359 				if (min > 0 && max >= 0 && min > max) max = min;
360 				fmtstr (buffer, &currlen, maxlen, strvalue, flags, min, max);
361 				break;
362 			case 'p':
363 				strvalue = va_arg (args, void *);
364 				fmtint (buffer, &currlen, maxlen, (long) strvalue, 16, min, max, flags);
365 				break;
366 			case 'n':
367 				if (cflags == DP_C_SHORT) {
368 					short int *num;
369 					num = va_arg (args, short int *);
370 					*num = currlen;
371 				} else if (cflags == DP_C_LONG) {
372 					long int *num;
373 					num = va_arg (args, long int *);
374 					*num = (long int)currlen;
375 				} else if (cflags == DP_C_LLONG) {
376 					LLONG *num;
377 					num = va_arg (args, LLONG *);
378 					*num = (LLONG)currlen;
379 				} else {
380 					int *num;
381 					num = va_arg (args, int *);
382 					*num = currlen;
383 				}
384 				break;
385 			case '%':
386 				dopr_outch (buffer, &currlen, maxlen, ch);
387 				break;
388 			case 'w':
389 				/* not supported yet, treat as next char */
390 				ch = *format++;
391 				break;
392 			default:
393 				/* Unknown, skip */
394 				break;
395 			}
396 			ch = *format++;
397 			state = DP_S_DEFAULT;
398 			flags = cflags = min = 0;
399 			max = -1;
400 			break;
401 		case DP_S_DONE:
402 			break;
403 		default:
404 			/* hmm? */
405 			break; /* some picky compilers need this */
406 		}
407 	}
408 	if (maxlen != 0) {
409 		if (currlen < maxlen - 1) 
410 			buffer[currlen] = '\0';
411 		else if (maxlen > 0) 
412 			buffer[maxlen - 1] = '\0';
413 	}
414 	
415 	return currlen;
416 }
417 
418 static void fmtstr(char *buffer, size_t *currlen, size_t maxlen,
419 		    char *value, int flags, int min, int max)
420 {
421 	int padlen, strln;     /* amount to pad */
422 	int cnt = 0;
423 
424 #ifdef DEBUG_SNPRINTF
425 	printf("fmtstr min=%d max=%d s=[%s]\n", min, max, value);
426 #endif
427 	if (value == 0) {
428 		value = "<NULL>";
429 	}
430 
431 	for (strln = 0; value[strln]; ++strln); /* strlen */
432 	padlen = min - strln;
433 	if (padlen < 0) 
434 		padlen = 0;
435 	if (flags & DP_F_MINUS) 
436 		padlen = -padlen; /* Left Justify */
437 	
438 	while ((padlen > 0) && (cnt < max)) {
439 		dopr_outch (buffer, currlen, maxlen, ' ');
440 		--padlen;
441 		++cnt;
442 	}
443 	while (*value && (cnt < max)) {
444 		dopr_outch (buffer, currlen, maxlen, *value++);
445 		++cnt;
446 	}
447 	while ((padlen < 0) && (cnt < max)) {
448 		dopr_outch (buffer, currlen, maxlen, ' ');
449 		++padlen;
450 		++cnt;
451 	}
452 }
453 
454 /* Have to handle DP_F_NUM (ie 0x and 0 alternates) */
455 
456 static void fmtint(char *buffer, size_t *currlen, size_t maxlen,
457 		    long value, int base, int min, int max, int flags)
458 {
459 	int signvalue = 0;
460 	unsigned long uvalue;
461 	char convert[20];
462 	int place = 0;
463 	int spadlen = 0; /* amount to space pad */
464 	int zpadlen = 0; /* amount to zero pad */
465 	int caps = 0;
466 	
467 	if (max < 0)
468 		max = 0;
469 	
470 	uvalue = value;
471 	
472 	if(!(flags & DP_F_UNSIGNED)) {
473 		if( value < 0 ) {
474 			signvalue = '-';
475 			uvalue = -value;
476 		} else {
477 			if (flags & DP_F_PLUS)  /* Do a sign (+/i) */
478 				signvalue = '+';
479 			else if (flags & DP_F_SPACE)
480 				signvalue = ' ';
481 		}
482 	}
483   
484 	if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
485 
486 	do {
487 		convert[place++] =
488 			(caps? "0123456789ABCDEF":"0123456789abcdef")
489 			[uvalue % (unsigned)base  ];
490 		uvalue = (uvalue / (unsigned)base );
491 	} while(uvalue && (place < 20));
492 	if (place == 20) place--;
493 	convert[place] = 0;
494 
495 	zpadlen = max - place;
496 	spadlen = min - MAX (max, place) - (signvalue ? 1 : 0);
497 	if (zpadlen < 0) zpadlen = 0;
498 	if (spadlen < 0) spadlen = 0;
499 	if (flags & DP_F_ZERO) {
500 		zpadlen = MAX(zpadlen, spadlen);
501 		spadlen = 0;
502 	}
503 	if (flags & DP_F_MINUS) 
504 		spadlen = -spadlen; /* Left Justifty */
505 
506 #ifdef DEBUG_SNPRINTF
507 	printf("zpad: %d, spad: %d, min: %d, max: %d, place: %d\n",
508 	       zpadlen, spadlen, min, max, place);
509 #endif
510 
511 	/* Spaces */
512 	while (spadlen > 0) {
513 		dopr_outch (buffer, currlen, maxlen, ' ');
514 		--spadlen;
515 	}
516 
517 	/* Sign */
518 	if (signvalue) 
519 		dopr_outch (buffer, currlen, maxlen, signvalue);
520 
521 	/* Zeros */
522 	if (zpadlen > 0) {
523 		while (zpadlen > 0) {
524 			dopr_outch (buffer, currlen, maxlen, '0');
525 			--zpadlen;
526 		}
527 	}
528 
529 	/* Digits */
530 	while (place > 0) 
531 		dopr_outch (buffer, currlen, maxlen, convert[--place]);
532   
533 	/* Left Justified spaces */
534 	while (spadlen < 0) {
535 		dopr_outch (buffer, currlen, maxlen, ' ');
536 		++spadlen;
537 	}
538 }
539 
540 static LDOUBLE abs_val(LDOUBLE value)
541 {
542 	LDOUBLE result = value;
543 
544 	if (value < 0)
545 		result = -value;
546 	
547 	return result;
548 }
549 
550 static LDOUBLE POW10(int exp)
551 {
552 	LDOUBLE result = 1;
553 	
554 	while (exp) {
555 		result *= 10;
556 		exp--;
557 	}
558   
559 	return result;
560 }
561 
562 static LLONG ROUND(LDOUBLE value)
563 {
564 	LLONG intpart;
565 
566 	intpart = (LLONG)value;
567 	value = value - intpart;
568 	if (value >= 0.5) intpart++;
569 	
570 	return intpart;
571 }
572 
573 /* a replacement for modf that doesn't need the math library. Should
574    be portable, but slow */
575 static double my_modf(double x0, double *iptr)
576 {
577 	int i;
578 	long l;
579 	double x = x0;
580 	double f = 1.0;
581 
582 	for (i=0;i<100;i++) {
583 		l = (long)x;
584 		if (l <= (x+1) && l >= (x-1)) break;
585 		x *= 0.1;
586 		f *= 10.0;
587 	}
588 
589 	if (i == 100) {
590 		/* yikes! the number is beyond what we can handle. What do we do? */
591 		(*iptr) = 0;
592 		return 0;
593 	}
594 
595 	if (i != 0) {
596 		double i2;
597 		double ret;
598 
599 		ret = my_modf(x0-l*f, &i2);
600 		(*iptr) = l*f + i2;
601 		return ret;
602 	} 
603 
604 	(*iptr) = l;
605 	return x - (*iptr);
606 }
607 
608 
609 static void fmtfp (char *buffer, size_t *currlen, size_t maxlen,
610 		   LDOUBLE fvalue, int min, int max, int flags)
611 {
612 	int signvalue = 0;
613 	double ufvalue;
614 	char iconvert[311];
615 	char fconvert[311];
616 	int iplace = 0;
617 	int fplace = 0;
618 	int padlen = 0; /* amount to pad */
619 	int zpadlen = 0; 
620 	int caps = 0;
621 	int index;
622 	double intpart;
623 	double fracpart;
624 	double temp;
625   
626 	/* 
627 	 * AIX manpage says the default is 0, but Solaris says the default
628 	 * is 6, and sprintf on AIX defaults to 6
629 	 */
630 	if (max < 0)
631 		max = 6;
632 
633 	ufvalue = abs_val (fvalue);
634 
635 	if (fvalue < 0) {
636 		signvalue = '-';
637 	} else {
638 		if (flags & DP_F_PLUS) { /* Do a sign (+/i) */
639 			signvalue = '+';
640 		} else {
641 			if (flags & DP_F_SPACE)
642 				signvalue = ' ';
643 		}
644 	}
645 
646 #if 0
647 	if (flags & DP_F_UP) caps = 1; /* Should characters be upper case? */
648 #endif
649 
650 #if 0
651 	if (max == 0) ufvalue += 0.5; /* if max = 0 we must round */
652 #endif
653 
654 	/* 
655 	 * Sorry, we only support 16 digits past the decimal because of our 
656 	 * conversion method
657 	 */
658 	if (max > 16)
659 		max = 16;
660 
661 	/* We "cheat" by converting the fractional part to integer by
662 	 * multiplying by a factor of 10
663 	 */
664 
665 	temp = ufvalue;
666 	my_modf(temp, &intpart);
667 
668 	fracpart = ROUND((POW10(max)) * (ufvalue - intpart));
669 	
670 	if (fracpart >= POW10(max)) {
671 		intpart++;
672 		fracpart -= POW10(max);
673 	}
674 
675 
676 	/* Convert integer part */
677 	do {
678 		temp = intpart;
679 		my_modf(intpart*0.1, &intpart);
680 		temp = temp*0.1;
681 		index = (int) ((temp -intpart +0.05)* 10.0);
682 		/* index = (int) (((double)(temp*0.1) -intpart +0.05) *10.0); */
683 		/* printf ("%llf, %f, %x\n", temp, intpart, index); */
684 		iconvert[iplace++] =
685 			(caps? "0123456789ABCDEF":"0123456789abcdef")[index];
686 	} while (intpart && (iplace < 311));
687 	if (iplace == 311) iplace--;
688 	iconvert[iplace] = 0;
689 
690 	/* Convert fractional part */
691 	if (fracpart)
692 	{
693 		do {
694 			temp = fracpart;
695 			my_modf(fracpart*0.1, &fracpart);
696 			temp = temp*0.1;
697 			index = (int) ((temp -fracpart +0.05)* 10.0);
698 			/* index = (int) ((((temp/10) -fracpart) +0.05) *10); */
699 			/* printf ("%lf, %lf, %ld\n", temp, fracpart, index); */
700 			fconvert[fplace++] =
701 			(caps? "0123456789ABCDEF":"0123456789abcdef")[index];
702 		} while(fracpart && (fplace < 311));
703 		if (fplace == 311) fplace--;
704 	}
705 	fconvert[fplace] = 0;
706   
707 	/* -1 for decimal point, another -1 if we are printing a sign */
708 	padlen = min - iplace - max - 1 - ((signvalue) ? 1 : 0); 
709 	zpadlen = max - fplace;
710 	if (zpadlen < 0) zpadlen = 0;
711 	if (padlen < 0) 
712 		padlen = 0;
713 	if (flags & DP_F_MINUS) 
714 		padlen = -padlen; /* Left Justifty */
715 	
716 	if ((flags & DP_F_ZERO) && (padlen > 0)) {
717 		if (signvalue) {
718 			dopr_outch (buffer, currlen, maxlen, signvalue);
719 			--padlen;
720 			signvalue = 0;
721 		}
722 		while (padlen > 0) {
723 			dopr_outch (buffer, currlen, maxlen, '0');
724 			--padlen;
725 		}
726 	}
727 	while (padlen > 0) {
728 		dopr_outch (buffer, currlen, maxlen, ' ');
729 		--padlen;
730 	}
731 	if (signvalue) 
732 		dopr_outch (buffer, currlen, maxlen, signvalue);
733 	
734 	while (iplace > 0) 
735 		dopr_outch (buffer, currlen, maxlen, iconvert[--iplace]);
736 
737 #ifdef DEBUG_SNPRINTF
738 	printf("fmtfp: fplace=%d zpadlen=%d\n", fplace, zpadlen);
739 #endif
740 
741 	/*
742 	 * Decimal point.  This should probably use locale to find the correct
743 	 * char to print out.
744 	 */
745 	if (max > 0) {
746 		dopr_outch (buffer, currlen, maxlen, '.');
747 		
748 		while (fplace > 0) 
749 			dopr_outch (buffer, currlen, maxlen, fconvert[--fplace]);
750 	}
751 	
752 	while (zpadlen > 0) {
753 		dopr_outch (buffer, currlen, maxlen, '0');
754 		--zpadlen;
755 	}
756 
757 	while (padlen < 0) {
758 		dopr_outch (buffer, currlen, maxlen, ' ');
759 		++padlen;
760 	}
761 }
762 
763 static void dopr_outch(char *buffer, size_t *currlen, size_t maxlen, char c)
764 {
765 	if (*currlen < maxlen) {
766 		buffer[(*currlen)] = c;
767 	}
768 	(*currlen)++;
769 }
770 
771 #if !defined(HAVE_VSNPRINTF)
772 int vsnprintf (char *str, size_t count, const char *fmt, va_list args)
773 {
774 	return dopr(str, count, fmt, args);
775 }
776 #endif
777 
778 #if !defined(HAVE_SNPRINTF)
779 int snprintf(char *str,size_t count,const char *fmt,...)
780 {
781 	size_t ret;
782 	va_list ap;
783     
784 	va_start(ap, fmt);
785 	ret = vsnprintf(str, count, fmt, ap);
786 	va_end(ap);
787 	return ret;
788 }
789 #endif
790 
791 #endif
792 
793 
794 #ifdef TEST_SNPRINTF
795 int sprintf(char *str,const char *fmt,...);
796 int main (void)
797 {
798 	char buf1[1024];
799 	char buf2[1024];
800 	char *fp_fmt[] = {
801 		"%1.1f",
802 		"%-1.5f",
803 		"%1.5f",
804 		"%123.9f",
805 		"%10.5f",
806 		"% 10.5f",
807 		"%+22.9f",
808 		"%+4.9f",
809 		"%01.3f",
810 		"%4f",
811 		"%3.1f",
812 		"%3.2f",
813 		"%.0f",
814 		"%f",
815 		"-16.16f",
816 		NULL
817 	};
818 	double fp_nums[] = { 6442452944.1234, -1.5, 134.21, 91340.2, 341.1234, 0203.9, 0.96, 0.996, 
819 			     0.9996, 1.996, 4.136,  0};
820 	char *int_fmt[] = {
821 		"%-1.5d",
822 		"%1.5d",
823 		"%123.9d",
824 		"%5.5d",
825 		"%10.5d",
826 		"% 10.5d",
827 		"%+22.33d",
828 		"%01.3d",
829 		"%4d",
830 		"%d",
831 		NULL
832 	};
833 	long int_nums[] = { -1, 134, 91340, 341, 0203, 0};
834 	char *str_fmt[] = {
835 		"10.5s",
836 		"5.10s",
837 		"10.1s",
838 		"0.10s",
839 		"10.0s",
840 		"1.10s",
841 		"%s",
842 		"%.1s",
843 		"%.10s",
844 		"%10s",
845 		NULL
846 	};
847 	char *str_vals[] = {"hello", "a", "", "a longer string", NULL};
848 	int x, y;
849 	int fail = 0;
850 	int num = 0;
851 
852 	printf ("Testing snprintf format codes against system sprintf...\n");
853 
854 	for (x = 0; fp_fmt[x] ; x++) {
855 		for (y = 0; fp_nums[y] != 0 ; y++) {
856 			int l1 = snprintf(NULL, 0, fp_fmt[x], fp_nums[y]);
857 			int l2 = snprintf(buf1, sizeof(buf1), fp_fmt[x], fp_nums[y]);
858 			sprintf (buf2, fp_fmt[x], fp_nums[y]);
859 			if (strcmp (buf1, buf2)) {
860 				printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", 
861 				       fp_fmt[x], buf1, buf2);
862 				fail++;
863 			}
864 			if (l1 != l2) {
865 				printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, fp_fmt[x]);
866 				fail++;
867 			}
868 			num++;
869 		}
870 	}
871 
872 	for (x = 0; int_fmt[x] ; x++) {
873 		for (y = 0; int_nums[y] != 0 ; y++) {
874 			int l1 = snprintf(NULL, 0, int_fmt[x], int_nums[y]);
875 			int l2 = snprintf(buf1, sizeof(buf1), int_fmt[x], int_nums[y]);
876 			sprintf (buf2, int_fmt[x], int_nums[y]);
877 			if (strcmp (buf1, buf2)) {
878 				printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", 
879 				       int_fmt[x], buf1, buf2);
880 				fail++;
881 			}
882 			if (l1 != l2) {
883 				printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, int_fmt[x]);
884 				fail++;
885 			}
886 			num++;
887 		}
888 	}
889 
890 	for (x = 0; str_fmt[x] ; x++) {
891 		for (y = 0; str_vals[y] != 0 ; y++) {
892 			int l1 = snprintf(NULL, 0, str_fmt[x], str_vals[y]);
893 			int l2 = snprintf(buf1, sizeof(buf1), str_fmt[x], str_vals[y]);
894 			sprintf (buf2, str_fmt[x], str_vals[y]);
895 			if (strcmp (buf1, buf2)) {
896 				printf("snprintf doesn't match Format: %s\n\tsnprintf = [%s]\n\t sprintf = [%s]\n", 
897 				       str_fmt[x], buf1, buf2);
898 				fail++;
899 			}
900 			if (l1 != l2) {
901 				printf("snprintf l1 != l2 (%d %d) %s\n", l1, l2, str_fmt[x]);
902 				fail++;
903 			}
904 			num++;
905 		}
906 	}
907 
908 	printf ("%d tests failed out of %d.\n", fail, num);
909 
910 	printf("seeing how many digits we support\n");
911 	{
912 		double v0 = 0.12345678901234567890123456789012345678901;
913 		for (x=0; x<100; x++) {
914 			snprintf(buf1, sizeof(buf1), "%1.1f", v0*pow(10, x));
915 			sprintf(buf2,		"%1.1f", v0*pow(10, x));
916 			if (strcmp(buf1, buf2)) {
917 				printf("we seem to support %d digits\n", x-1);
918 				break;
919 			}
920 		}
921 	}
922 	return 0;
923 }
924 #endif /* SNPRINTF_TEST */
925 
926 
927 /* -eof- */