1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37/*
38 * Actual printf innards.
39 *
40 * This code is large and complicated...
41 */
42
43#include <sys/types.h>
44
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <errno.h>
49
50#ifdef __STDC__
51#	include <stdarg.h>
52#else
53#	include <varargs.h>
54#endif
55
56#include <errno_private.h>
57
58#include "local.h"
59#include "fvwrite.h"
60
61static void __find_arguments (const char *fmt0, va_list ap,
62	va_list **argtable);
63static int __grow_type_table (unsigned char **typetable,
64	int *tablesize);
65
66/*
67 * Flush out all the vectors defined by the given uio,
68 * then reset it so that it can be reused.
69 */
70
71static int
72__sprint(FILE *fp, register struct __suio *uio)
73{
74	register int err;
75
76	if (uio->uio_resid == 0) {
77		uio->uio_iovcnt = 0;
78		return 0;
79	}
80	err = __sfvwrite(fp, uio);
81	uio->uio_resid = 0;
82	uio->uio_iovcnt = 0;
83	return err;
84}
85
86
87/*
88 * Helper function for `fprintf to unbuffered unix file': creates a
89 * temporary buffer.  We only work on write-only files; this avoids
90 * worries about ungetc buffers and so forth.
91 */
92
93static int
94__sbprintf(register FILE *fp, const char *fmt, va_list ap)
95{
96	int ret;
97	FILE fake;
98	unsigned char buf[BUFSIZ];
99
100	/* copy the important variables */
101	fake._flags = fp->_flags & ~__SNBF;
102	fake._file = fp->_file;
103	fake._cookie = fp->_cookie;
104	fake._write = fp->_write;
105
106	/* set up the buffer */
107	fake._bf._base = fake._p = buf;
108	fake._bf._size = fake._w = sizeof(buf);
109	fake._lbfsize = 0;	/* not actually used, but Just In Case */
110
111	/* do the work, then copy any error status */
112	ret = vfprintf(&fake, fmt, ap);
113	if (ret >= 0 && fflush(&fake))
114		ret = EOF;
115	if (fake._flags & __SERR)
116		fp->_flags |= __SERR;
117	return (ret);
118}
119
120
121#ifdef FLOATING_POINT
122#include <locale.h>
123#include <math.h>
124#include "floatio.h"
125
126#define	BUF		(MAXEXP+MAXFRACT+1)	/* + decimal point */
127#define	DEFPREC		6
128
129static char *cvt (double, int, int, char *, int *, int, int *);
130static int exponent (char *, int, int);
131
132#else /* no FLOATING_POINT */
133#define	BUF		40
134#endif /* FLOATING_POINT */
135
136#define STATIC_ARG_TBL_SIZE 8	/* Size of static argument table. */
137
138
139/*
140 * Macros for converting digits to letters and vice versa
141 */
142#define	to_digit(c)	((c) - '0')
143#define is_digit(c)	((unsigned)to_digit(c) <= 9)
144#define	to_char(n)	((n) + '0')
145
146/*
147 * Flags used during conversion.
148 */
149#define	ALT		0x001		/* alternate form */
150#define	HEXPREFIX	0x002		/* add 0x or 0X prefix */
151#define	LADJUST		0x004		/* left adjustment */
152#define	LONGDBL		0x008		/* long double; unimplemented */
153#define	LONGINT		0x010		/* long integer */
154#define	QUADINT		0x020		/* quad integer */
155#define	SHORTINT	0x040		/* short integer */
156#define	ZEROPAD		0x080		/* zero (as opposed to blank) pad */
157#define FPT		0x100		/* Floating point number */
158
159int
160vfprintf(FILE *fp, const char *fmt0, va_list ap)
161{
162	register char *fmt;	/* format string */
163	register int ch;	/* character from fmt */
164	register int n, m, n2;	/* handy integers (short term usage) */
165	register char *cp;	/* handy char pointer (short term usage) */
166	register struct __siov *iovp;/* for PRINT macro */
167	register int flags;	/* flags as above */
168	int ret;		/* return value accumulator */
169	int width;		/* width from format (%8d), or 0 */
170	int prec;		/* precision from format (%.3d), or -1 */
171	char sign;		/* sign prefix (' ', '+', '-', or \0) */
172	wchar_t wc;
173#ifdef FLOATING_POINT
174	char *decimal_point = localeconv()->decimal_point;
175	char softsign;		/* temporary negative sign for floats */
176	double _double;		/* double precision arguments %[eEfgG] */
177	int expt;		/* integer value of exponent */
178	int expsize;		/* character count for expstr */
179	int ndig;		/* actual number of digits returned by cvt */
180	char expstr[7];		/* buffer for exponent string */
181#endif
182
183#ifdef __GNUC__			/* gcc has builtin quad type (long long) SOS */
184#define	quad_t	  long long
185#define	u_quad_t  unsigned long long
186#endif
187
188	u_quad_t _uquad;	/* integer arguments %[diouxX] */
189	enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
190	int dprec;		/* a copy of prec if [diouxX], 0 otherwise */
191	int realsz;		/* field size expanded by dprec */
192	int size;		/* size of converted field or string */
193	char *xdigs=NULL;	/* digits for [xX] conversion */
194#define NIOV 8
195	struct __suio uio;	/* output information: summary */
196	struct __siov iov[NIOV];/* ... and individual io vectors */
197	char buf[BUF];		/* space for %c, %[diouxX], %[eEfgG] */
198	char ox[2];		/* space for 0x hex-prefix */
199	va_list *argtable;        /* args, built due to positional arg */
200	va_list statargtable[STATIC_ARG_TBL_SIZE];
201	int nextarg;            /* 1-based argument index */
202	va_list orgap;          /* original argument pointer */
203
204	/*
205	 * Choose PADSIZE to trade efficiency vs. size.  If larger printf
206	 * fields occur frequently, increase PADSIZE and make the initialisers
207	 * below longer.
208	 */
209#define	PADSIZE	16		/* pad chunk size */
210	static char blanks[PADSIZE] =
211	 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
212	static char zeroes[PADSIZE] =
213	 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
214
215	/*
216	 * BEWARE, these `goto error' on error, and PAD uses `n'.
217	 */
218#define	PRINT(ptr, len) do { \
219	iovp->iov_base = (ptr); \
220	iovp->iov_len = (len); \
221	uio.uio_resid += (len); \
222	iovp++; \
223	if (++uio.uio_iovcnt >= NIOV) { \
224		if (__sprint(fp, &uio)) \
225			goto error; \
226		iovp = iov; \
227	} \
228} while (0)
229#define	PAD(howmany, with) do { \
230	if ((n = (howmany)) > 0) { \
231		while (n > PADSIZE) { \
232			PRINT(with, PADSIZE); \
233			n -= PADSIZE; \
234		} \
235		PRINT(with, n); \
236	} \
237} while (0)
238#define	FLUSH() do { \
239	if (uio.uio_resid && __sprint(fp, &uio)) \
240		goto error; \
241	uio.uio_iovcnt = 0; \
242	iovp = iov; \
243} while (0)
244
245	/*
246	 * To extend shorts properly, we need both signed and unsigned
247	 * argument extraction methods.
248	 */
249#define	SARG() \
250	(flags&QUADINT ? va_arg(ap, quad_t) : \
251	    flags&LONGINT ? GETARG(long) : \
252	    flags&SHORTINT ? (long)(short)GETARG(int) : \
253	    (long)GETARG(int))
254#define	UARG() \
255	(flags&QUADINT ? va_arg(ap, u_quad_t) : \
256	    flags&LONGINT ? GETARG(u_long) : \
257	    flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \
258	    (u_long)GETARG(u_int))
259
260         /*
261          * Get * arguments, including the form *nn$.  Preserve the nextarg
262          * that the argument can be gotten once the type is determined.
263          */
264#define GETASTER(val) \
265	 n2 = 0; \
266	 cp = fmt; \
267	 while (is_digit(*cp)) { \
268		 n2 = 10 * n2 + to_digit(*cp); \
269		 cp++; \
270	 } \
271	 if (*cp == '$') { \
272	       int hold = nextarg; \
273		 if (argtable == NULL) { \
274			 argtable = statargtable; \
275			 __find_arguments(fmt0, orgap, &argtable); \
276		 } \
277		 nextarg = n2; \
278		 val = GETARG(int); \
279		 nextarg = hold; \
280		 fmt = ++cp; \
281	} \
282	else { \
283	       val = GETARG(int); \
284	 }
285
286/*
287* Get the argument indexed by nextarg.   If the argument table is
288* built, use it to get the argument.  If its not, get the next
289* argument (and arguments must be gotten sequentially).
290*/
291#define GETARG(type) \
292	(((argtable != NULL) ? (void)(ap = argtable[nextarg]) : (void)0), \
293	 nextarg++, va_arg(ap, type))
294
295	/* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
296	if (cantwrite(fp)) {
297		__set_errno(EBADF);
298		return (EOF);
299	}
300
301	/* optimise fprintf(stderr) (and other unbuffered Unix files) */
302	if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
303	    fp->_file >= 0)
304		return (__sbprintf(fp, fmt0, ap));
305
306	fmt = (char *)fmt0;
307	argtable = NULL;
308	nextarg = 1;
309	orgap = ap;
310	uio.uio_iov = iovp = iov;
311	uio.uio_resid = 0;
312	uio.uio_iovcnt = 0;
313	ret = 0;
314
315	/*
316	 * Scan the format for conversions (`%' character).
317	 */
318	for (;;) {
319		cp = fmt;
320		while ((n = mbtowc(&wc, fmt, MB_CUR_MAX)) > 0) {
321			fmt += n;
322			if (wc == '%') {
323				fmt--;
324				break;
325			}
326		}
327		if ((m = fmt - cp) != 0) {
328			PRINT(cp, m);
329			ret += m;
330		}
331		if (n <= 0)
332			goto done;
333		fmt++;		/* skip over '%' */
334
335		flags = 0;
336		dprec = 0;
337		width = 0;
338		prec = -1;
339		sign = '\0';
340
341rflag:		ch = *fmt++;
342reswitch:	switch (ch) {
343		case ' ':
344			/*
345			 * ``If the space and + flags both appear, the space
346			 * flag will be ignored.''
347			 *	-- ANSI X3J11
348			 */
349			if (!sign)
350				sign = ' ';
351			goto rflag;
352		case '#':
353			flags |= ALT;
354			goto rflag;
355		case '*':
356			/*
357			 * ``A negative field width argument is taken as a
358			 * - flag followed by a positive field width.''
359			 *	-- ANSI X3J11
360			 * They don't exclude field widths read from args.
361			 */
362			GETASTER(width);
363			if (width >= 0)
364				goto rflag;
365			width = -width;
366			/* FALLTHROUGH */
367		case '-':
368			flags |= LADJUST;
369			goto rflag;
370		case '+':
371			sign = '+';
372			goto rflag;
373		case '.':
374			if ((ch = *fmt++) == '*') {
375				GETASTER(n);
376				prec = n < 0 ? -1 : n;
377				goto rflag;
378			}
379			n = 0;
380			while (is_digit(ch)) {
381				n = 10 * n + to_digit(ch);
382				ch = *fmt++;
383			}
384			if (ch == '$') {
385				nextarg = n;
386				if (argtable == NULL) {
387					argtable = statargtable;
388					__find_arguments(fmt0, orgap,
389					    &argtable);
390				}
391				goto rflag;
392			}
393			prec = n < 0 ? -1 : n;
394			goto reswitch;
395		case '0':
396			/*
397			 * ``Note that 0 is taken as a flag, not as the
398			 * beginning of a field width.''
399			 *	-- ANSI X3J11
400			 */
401			flags |= ZEROPAD;
402			goto rflag;
403		case '1': case '2': case '3': case '4':
404		case '5': case '6': case '7': case '8': case '9':
405			n = 0;
406			do {
407				n = 10 * n + to_digit(ch);
408				ch = *fmt++;
409			} while (is_digit(ch));
410                       	if (ch == '$') {
411				nextarg = n;
412			   	if (argtable == NULL) {
413			   		argtable = statargtable;
414			   		__find_arguments(fmt0, orgap,
415					    &argtable);
416			  	}
417				goto rflag;
418			}
419			width = n;
420			goto reswitch;
421		case 'L':
422			flags |= QUADINT
423#ifdef FLOATING_POINT
424				| LONGDBL
425#endif
426				;
427			goto rflag;
428		case 'h':
429			flags |= SHORTINT;
430			goto rflag;
431		case 'l':
432			if (*fmt == 'l') {
433				fmt++;
434				flags |= QUADINT;
435			} else {
436				flags |= LONGINT;
437			}
438			goto rflag;
439		case 'q':
440			flags |= QUADINT;
441			goto rflag;
442		case 'c':
443			*(cp = buf) = GETARG(int);
444			size = 1;
445			sign = '\0';
446			break;
447		case 'D':
448			flags |= LONGINT;
449			/*FALLTHROUGH*/
450		case 'd':
451		case 'i':
452			_uquad = SARG();
453			if ((quad_t)_uquad < 0) {
454				_uquad = -_uquad;
455				sign = '-';
456			}
457			base = DEC;
458			goto number;
459#ifdef FLOATING_POINT
460		case 'e':
461		case 'E':
462		case 'f':
463		case 'g':
464		case 'G':
465			if (prec == -1) {
466				prec = DEFPREC;
467			} else if ((ch == 'g' || ch == 'G') && prec == 0) {
468				prec = 1;
469			}
470
471			if (flags & LONGDBL) {
472				_double = (double) GETARG(long double);
473			} else {
474				_double = GETARG(double);
475			}
476
477			/* do this before tricky precision changes */
478			if (isinf(_double)) {
479				if (_double < 0)
480					sign = '-';
481				cp = "Inf";
482				size = 3;
483				break;
484			}
485			if (isnan(_double)) {
486				cp = "NaN";
487				size = 3;
488				break;
489			}
490
491			flags |= FPT;
492			cp = cvt(_double, prec, flags, &softsign,
493				&expt, ch, &ndig);
494			if (ch == 'g' || ch == 'G') {
495				if (expt <= -4 || expt > prec)
496					ch = (ch == 'g') ? 'e' : 'E';
497				else
498					ch = 'g';
499			}
500			if (ch <= 'e') {	/* 'e' or 'E' fmt */
501				--expt;
502				expsize = exponent(expstr, expt, ch);
503				size = expsize + ndig;
504				if (ndig > 1 || flags & ALT)
505					++size;
506			} else if (ch == 'f') {		/* f fmt */
507				if (expt > 0) {
508					size = expt;
509					if (prec || flags & ALT)
510						size += prec + 1;
511				} else	/* "0.X" */
512					size = prec + 2;
513			} else if (expt >= ndig) {	/* fixed g fmt */
514				size = expt;
515				if (flags & ALT)
516					++size;
517			} else
518				size = ndig + (expt > 0 ?
519					1 : 2 - expt);
520
521			if (softsign)
522				sign = '-';
523			break;
524#endif /* FLOATING_POINT */
525		case 'n':
526			if (flags & QUADINT)
527				*GETARG(quad_t *) = ret;
528			else if (flags & LONGINT)
529				*GETARG(long *) = ret;
530			else if (flags & SHORTINT)
531				*GETARG(short *) = ret;
532			else
533				*GETARG(int *) = ret;
534			continue;	/* no output */
535		case 'O':
536			flags |= LONGINT;
537			/*FALLTHROUGH*/
538		case 'o':
539			_uquad = UARG();
540			base = OCT;
541			goto nosign;
542		case 'p':
543			/*
544			 * ``The argument shall be a pointer to void.  The
545			 * value of the pointer is converted to a sequence
546			 * of printable characters, in an implementation-
547			 * defined manner.''
548			 *	-- ANSI X3J11
549			 */
550			/* NOSTRICT */
551			_uquad = (u_long)GETARG(void *);
552			base = HEX;
553			xdigs = "0123456789abcdef";
554			flags |= HEXPREFIX;
555			ch = 'x';
556			goto nosign;
557		case 's':
558			if ((cp = GETARG(char *)) == NULL)
559				cp = "(null)";
560			if (prec >= 0) {
561				/*
562				 * can't use strlen; can only look for the
563				 * NUL in the first `prec' characters, and
564				 * strlen() will go further.
565				 */
566				char *p = memchr(cp, 0, prec);
567
568				if (p != NULL) {
569					size = p - cp;
570					if (size > prec)
571						size = prec;
572				} else
573					size = prec;
574			} else
575				size = strlen(cp);
576			sign = '\0';
577			break;
578		case 'U':
579			flags |= LONGINT;
580			/*FALLTHROUGH*/
581		case 'u':
582			_uquad = UARG();
583			base = DEC;
584			goto nosign;
585		case 'X':
586			xdigs = "0123456789ABCDEF";
587			goto hex;
588		case 'x':
589			xdigs = "0123456789abcdef";
590hex:			_uquad = UARG();
591			base = HEX;
592			/* leading 0x/X only if non-zero */
593			if (flags & ALT && _uquad != 0)
594				flags |= HEXPREFIX;
595
596			/* unsigned conversions */
597nosign:			sign = '\0';
598			/*
599			 * ``... diouXx conversions ... if a precision is
600			 * specified, the 0 flag will be ignored.''
601			 *	-- ANSI X3J11
602			 */
603number:			if ((dprec = prec) >= 0)
604				flags &= ~ZEROPAD;
605
606			/*
607			 * ``The result of converting a zero value with an
608			 * explicit precision of zero is no characters.''
609			 *	-- ANSI X3J11
610			 */
611			cp = buf + BUF;
612			if (_uquad != 0 || prec != 0) {
613				/*
614				 * Unsigned mod is hard, and unsigned mod
615				 * by a constant is easier than that by
616				 * a variable; hence this switch.
617				 */
618				switch (base) {
619				case OCT:
620					do {
621						*--cp = to_char(_uquad & 7);
622						_uquad >>= 3;
623					} while (_uquad);
624					/* handle octal leading 0 */
625					if (flags & ALT && *cp != '0')
626						*--cp = '0';
627					break;
628
629				case DEC:
630					/* many numbers are 1 digit */
631					while (_uquad >= 10) {
632						*--cp = to_char(_uquad % 10);
633						_uquad /= 10;
634					}
635					*--cp = to_char(_uquad);
636					break;
637
638				case HEX:
639					do {
640						*--cp = xdigs[_uquad & 15];
641						_uquad >>= 4;
642					} while (_uquad);
643					break;
644
645				default:
646					cp = "bug in vfprintf: bad base";
647					size = strlen(cp);
648					goto skipsize;
649				}
650			}
651			size = buf + BUF - cp;
652		skipsize:
653			break;
654		default:	/* "%?" prints ?, unless ? is NUL */
655			if (ch == '\0')
656				goto done;
657			/* pretend it was %c with argument ch */
658			cp = buf;
659			*cp = ch;
660			size = 1;
661			sign = '\0';
662			break;
663		}
664
665		/*
666		 * All reasonable formats wind up here.  At this point, `cp'
667		 * points to a string which (if not flags&LADJUST) should be
668		 * padded out to `width' places.  If flags&ZEROPAD, it should
669		 * first be prefixed by any sign or other prefix; otherwise,
670		 * it should be blank padded before the prefix is emitted.
671		 * After any left-hand padding and prefixing, emit zeroes
672		 * required by a decimal [diouxX] precision, then print the
673		 * string proper, then emit zeroes required by any leftover
674		 * floating precision; finally, if LADJUST, pad with blanks.
675		 *
676		 * Compute actual size, so we know how much to pad.
677		 * size excludes decimal prec; realsz includes it.
678		 */
679		realsz = dprec > size ? dprec : size;
680		if (sign)
681			realsz++;
682		else if (flags & HEXPREFIX)
683			realsz+= 2;
684
685		/* right-adjusting blank padding */
686		if ((flags & (LADJUST|ZEROPAD)) == 0)
687			PAD(width - realsz, blanks);
688
689		/* prefix */
690		if (sign) {
691			PRINT(&sign, 1);
692		} else if (flags & HEXPREFIX) {
693			ox[0] = '0';
694			ox[1] = ch;
695			PRINT(ox, 2);
696		}
697
698		/* right-adjusting zero padding */
699		if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
700			PAD(width - realsz, zeroes);
701
702		/* leading zeroes from decimal precision */
703		PAD(dprec - size, zeroes);
704
705		/* the string or number proper */
706#ifdef FLOATING_POINT
707		if ((flags & FPT) == 0) {
708			PRINT(cp, size);
709		} else {	/* glue together f_p fragments */
710			if (ch >= 'f') {	/* 'f' or 'g' */
711				if (_double == 0) {
712					/* kludge for __dtoa irregularity */
713					PRINT("0", 1);
714					if (expt < ndig || (flags & ALT) != 0) {
715						PRINT(decimal_point, 1);
716						PAD(ndig - 1, zeroes);
717					}
718				} else if (expt <= 0) {
719					PRINT("0", 1);
720					PRINT(decimal_point, 1);
721					PAD(-expt, zeroes);
722					PRINT(cp, ndig);
723				} else if (expt >= ndig) {
724					PRINT(cp, ndig);
725					PAD(expt - ndig, zeroes);
726					if (flags & ALT)
727						PRINT(".", 1);
728				} else {
729					PRINT(cp, expt);
730					cp += expt;
731					PRINT(".", 1);
732					PRINT(cp, ndig-expt);
733				}
734			} else {	/* 'e' or 'E' */
735				if (ndig > 1 || flags & ALT) {
736					ox[0] = *cp++;
737					ox[1] = '.';
738					PRINT(ox, 2);
739					if (_double) {
740						PRINT(cp, ndig-1);
741					} else	/* 0.[0..] */
742						/* __dtoa irregularity */
743						PAD(ndig - 1, zeroes);
744				} else	/* XeYYY */
745					PRINT(cp, 1);
746				PRINT(expstr, expsize);
747			}
748		}
749#else
750		PRINT(cp, size);
751#endif
752		/* left-adjusting padding (always blank) */
753		if (flags & LADJUST)
754			PAD(width - realsz, blanks);
755
756		/* finally, adjust ret */
757		ret += width > realsz ? width : realsz;
758		FLUSH();	/* copy out the I/O vectors */
759	}
760done:
761
762	FLUSH();
763error:
764	if (argtable != NULL && argtable != statargtable)
765		free(argtable);
766	return (__sferror(fp) ? EOF : ret);
767	/* NOTREACHED */
768}
769
770/*
771 * Type ids for argument type table.
772 */
773#define T_UNUSED	0
774#define T_SHORT		1
775#define T_U_SHORT	2
776#define TP_SHORT	3
777#define T_INT		4
778#define T_U_INT		5
779#define TP_INT		6
780#define T_LONG		7
781#define T_U_LONG	8
782#define TP_LONG		9
783#define T_QUAD		10
784#define T_U_QUAD      	11
785#define TP_QUAD         12
786#define T_DOUBLE      	13
787#define T_LONG_DOUBLE 	14
788#define TP_CHAR		15
789#define TP_VOID		16
790
791
792/*
793 * Find all arguments when a positional parameter is encountered.  Returns a
794 * table, indexed by argument number, of pointers to each arguments.  The
795 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
796 * It will be replaces with a malloc-ed on if it overflows.
797 */
798
799static void
800__find_arguments(const char *fmt0, va_list ap, va_list **argtable)
801{
802	register char *fmt;	/* format string */
803	register int ch;	/* character from fmt */
804	register int n, n2;	/* handy integer (short term usage) */
805	register char *cp;	/* handy char pointer (short term usage) */
806	register int flags;	/* flags as above */
807	unsigned char *typetable; /* table of types */
808	unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
809	int tablesize;		/* current size of type table */
810	int tablemax;		/* largest used index in table */
811	int nextarg;		/* 1-based argument index */
812
813	/*
814	 * Add an argument type to the table, expanding if necessary.
815	 */
816#define ADDTYPE(type) \
817	((nextarg >= tablesize) ? \
818		__grow_type_table(&typetable, &tablesize) : 0, \
819	typetable[nextarg++] = type, \
820	(nextarg > tablemax) ? tablemax = nextarg : 0)
821
822#define	ADDSARG() \
823	((flags&LONGINT) ? ADDTYPE(T_LONG) : \
824		((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT)))
825
826#define	ADDUARG() \
827	((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
828		((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT)))
829
830	/*
831	 * Add * arguments to the type array.
832	 */
833#define ADDASTER() \
834	n2 = 0; \
835	cp = fmt; \
836	while (is_digit(*cp)) { \
837		n2 = 10 * n2 + to_digit(*cp); \
838		cp++; \
839	} \
840	if (*cp == '$') { \
841		int hold = nextarg; \
842		nextarg = n2; \
843		ADDTYPE(T_INT); \
844		nextarg = hold; \
845		fmt = ++cp; \
846	} else { \
847		ADDTYPE(T_INT); \
848	}
849	fmt = (char *)fmt0;
850	typetable = stattypetable;
851	tablesize = STATIC_ARG_TBL_SIZE;
852	tablemax = 0;
853	nextarg = 1;
854	memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
855
856	/*
857	 * Scan the format for conversions (`%' character).
858	 */
859	for (;;) {
860		for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
861			/* void */;
862		if (ch == '\0')
863			goto done;
864		fmt++;		/* skip over '%' */
865
866		flags = 0;
867
868rflag:		ch = *fmt++;
869reswitch:	switch (ch) {
870		case ' ':
871		case '#':
872			goto rflag;
873		case '*':
874			ADDASTER();
875			goto rflag;
876		case '-':
877		case '+':
878			goto rflag;
879		case '.':
880			if ((ch = *fmt++) == '*') {
881				ADDASTER();
882				goto rflag;
883			}
884			while (is_digit(ch)) {
885				ch = *fmt++;
886			}
887			goto reswitch;
888		case '0':
889			goto rflag;
890		case '1': case '2': case '3': case '4':
891		case '5': case '6': case '7': case '8': case '9':
892			n = 0;
893			do {
894				n = 10 * n + to_digit(ch);
895				ch = *fmt++;
896			} while (is_digit(ch));
897			if (ch == '$') {
898				nextarg = n;
899				goto rflag;
900			}
901			goto reswitch;
902		case 'L':
903			flags |= QUADINT
904#ifdef FLOATING_POINT
905				| LONGDBL
906#endif
907				;
908			goto rflag;
909		case 'h':
910			flags |= SHORTINT;
911			goto rflag;
912		case 'l':
913			if (*fmt == 'l') {
914				fmt++;
915				flags |= QUADINT;
916			} else
917				flags |= LONGINT;
918
919			goto rflag;
920		case 'q':
921			flags |= QUADINT;
922			goto rflag;
923		case 'c':
924			ADDTYPE(T_INT);
925			break;
926		case 'D':
927			flags |= LONGINT;
928			/*FALLTHROUGH*/
929		case 'd':
930		case 'i':
931			if (flags & QUADINT) {
932				ADDTYPE(T_QUAD);
933			} else {
934				ADDSARG();
935			}
936			break;
937#ifdef FLOATING_POINT
938		case 'e':
939		case 'E':
940		case 'f':
941		case 'g':
942		case 'G':
943			if (flags & LONGDBL)
944				ADDTYPE(T_LONG_DOUBLE);
945			else
946				ADDTYPE(T_DOUBLE);
947			break;
948#endif /* FLOATING_POINT */
949		case 'n':
950			if (flags & QUADINT)
951				ADDTYPE(TP_QUAD);
952			else if (flags & LONGINT)
953				ADDTYPE(TP_LONG);
954			else if (flags & SHORTINT)
955				ADDTYPE(TP_SHORT);
956			else
957				ADDTYPE(TP_INT);
958			continue;	/* no output */
959		case 'O':
960			flags |= LONGINT;
961			/*FALLTHROUGH*/
962		case 'o':
963			if (flags & QUADINT)
964				ADDTYPE(T_U_QUAD);
965			else
966				ADDUARG();
967			break;
968		case 'p':
969			ADDTYPE(TP_VOID);
970			break;
971		case 's':
972			ADDTYPE(TP_CHAR);
973			break;
974		case 'U':
975			flags |= LONGINT;
976			/*FALLTHROUGH*/
977		case 'u':
978			if (flags & QUADINT)
979				ADDTYPE(T_U_QUAD);
980			else
981				ADDUARG();
982			break;
983		case 'X':
984		case 'x':
985			if (flags & QUADINT)
986				ADDTYPE(T_U_QUAD);
987			else
988				ADDUARG();
989			break;
990		default:	/* "%?" prints ?, unless ? is NUL */
991			if (ch == '\0')
992				goto done;
993			break;
994		}
995	}
996done:
997	/*
998	 * Build the argument table.
999	 */
1000	if (tablemax >= STATIC_ARG_TBL_SIZE) {
1001		*argtable = (va_list *)
1002		    malloc(sizeof (va_list) * (tablemax + 1));
1003	}
1004
1005#if 0
1006	/* XXX is this required? */
1007	(*argtable) [0] = NULL;
1008#endif
1009	for (n = 1; n <= tablemax; n++) {
1010		(*argtable)[n] = ap;
1011		switch (typetable[n]) {
1012		case T_UNUSED:
1013			(void) va_arg(ap, int);
1014			break;
1015		case T_SHORT:
1016			(void) va_arg(ap, int);
1017			break;
1018		case T_U_SHORT:
1019			(void) va_arg(ap, int);
1020			break;
1021		case TP_SHORT:
1022			(void) va_arg(ap, short *);
1023			break;
1024		case T_INT:
1025			(void) va_arg(ap, int);
1026			break;
1027		case T_U_INT:
1028			(void) va_arg(ap, unsigned int);
1029			break;
1030		case TP_INT:
1031			(void) va_arg(ap, int *);
1032			break;
1033		case T_LONG:
1034			(void) va_arg(ap, long);
1035			break;
1036		case T_U_LONG:
1037			(void) va_arg(ap, unsigned long);
1038			break;
1039		case TP_LONG:
1040			(void) va_arg(ap, long *);
1041			break;
1042		case T_QUAD:
1043			(void) va_arg(ap, quad_t);
1044			break;
1045		case T_U_QUAD:
1046			(void) va_arg(ap, u_quad_t);
1047			break;
1048		case TP_QUAD:
1049			(void) va_arg(ap, quad_t *);
1050			break;
1051		case T_DOUBLE:
1052			(void) va_arg(ap, double);
1053			break;
1054		case T_LONG_DOUBLE:
1055			(void) va_arg(ap, long double);
1056			break;
1057		case TP_CHAR:
1058			(void) va_arg(ap, char *);
1059			break;
1060		case TP_VOID:
1061			(void) va_arg(ap, void *);
1062			break;
1063		}
1064	}
1065
1066	if (typetable != NULL && typetable != stattypetable)
1067		free(typetable);
1068}
1069
1070
1071/*
1072 * Increase the size of the type table.
1073 */
1074
1075static int
1076__grow_type_table(unsigned char **typetable, int *tablesize)
1077{
1078	unsigned char *oldtable = *typetable;
1079	int newsize = *tablesize * 2;
1080
1081	if (*tablesize == STATIC_ARG_TBL_SIZE) {
1082		*typetable = (unsigned char *)
1083		    malloc(sizeof (unsigned char) * newsize);
1084		/* XXX unchecked */
1085		bcopy(oldtable, *typetable, *tablesize);
1086	} else {
1087		*typetable = (unsigned char *)
1088		    realloc(*typetable, sizeof (unsigned char) * newsize);
1089		/* XXX unchecked */
1090	}
1091	memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize));
1092
1093	*tablesize = newsize;
1094	return(0);
1095}
1096
1097
1098#ifdef FLOATING_POINT
1099
1100extern char *__dtoa __P((double, int, int, int *, int *, char **));
1101
1102static char *
1103cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, int *length)
1104{
1105	int mode, dsgn;
1106	char *digits, *bp, *rve;
1107
1108	if (ch == 'f') {
1109		mode = 3;		/* ndigits after the decimal point */
1110	} else {
1111		/* To obtain ndigits after the decimal point for the 'e'
1112		 * and 'E' formats, round to ndigits + 1 significant
1113		 * figures.
1114		 */
1115		if (ch == 'e' || ch == 'E') {
1116			ndigits++;
1117		}
1118		mode = 2;		/* ndigits significant digits */
1119	}
1120
1121	if (value < 0) {
1122		value = -value;
1123		*sign = '-';
1124	} else
1125		*sign = '\000';
1126	digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
1127	if ((ch != 'g' && ch != 'G') || flags & ALT) {	/* Print trailing zeros */
1128		bp = digits + ndigits;
1129		if (ch == 'f') {
1130			if (*digits == '0' && value)
1131				*decpt = -ndigits + 1;
1132			bp += *decpt;
1133		}
1134		if (value == 0)	/* kludge for __dtoa irregularity */
1135			rve = bp;
1136		while (rve < bp)
1137			*rve++ = '0';
1138	}
1139	*length = rve - digits;
1140	return (digits);
1141}
1142
1143
1144static int
1145exponent(char *p0, int exp, int fmtch)
1146{
1147	register char *p, *t;
1148	char expbuf[MAXEXP];
1149
1150	p = p0;
1151	*p++ = fmtch;
1152	if (exp < 0) {
1153		exp = -exp;
1154		*p++ = '-';
1155	}
1156	else
1157		*p++ = '+';
1158	t = expbuf + MAXEXP;
1159	if (exp > 9) {
1160		do {
1161			*--t = to_char(exp % 10);
1162		} while ((exp /= 10) > 9);
1163		*--t = to_char(exp);
1164		for (; t < expbuf + MAXEXP; *p++ = *t++);
1165	}
1166	else {
1167		*p++ = '0';
1168		*p++ = to_char(exp);
1169	}
1170	return (p - p0);
1171}
1172#endif /* FLOATING_POINT */
1173