xref: /titanic_44/usr/src/lib/libast/common/sfio/sfvscanf.c (revision 8339b41da2395f0525c46ceedfeb01961893ec44)
1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                  Common Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #include	"sfhdr.h"
23 
24 /*	The main engine for reading formatted data
25 **
26 **	Written by Kiem-Phong Vo.
27 */
28 
29 #define MAXWIDTH	(int)(((uint)~0)>>1)	/* max amount to scan	*/
30 
31 /*
32  * pull in a private strtold()
33  */
34 
35 #include "sfstrtof.h"
36 
37 /* refresh stream buffer - taking care of unseekable/share streams too */
38 #if __STD_C
39 static void _sfbuf(Sfio_t* f, int* peek)
40 #else
41 static void _sfbuf(f, peek)
42 Sfio_t*	f;
43 int*	peek;
44 #endif
45 {
46 	if(f->next >= f->endb)
47 	{	if(*peek) 	/* try peeking for a share stream if possible */
48 		{	f->mode |= SF_RV;
49 			if(SFFILBUF(f,-1) > 0)
50 			{	f->mode |= SF_PEEK;
51 				return;
52 			}
53 			*peek = 0;	/* can't peek, back to normal reads */
54 		}
55 		(void)SFFILBUF(f,-1);
56 	}
57 }
58 
59 /* buffer used during scanning of a double value or a multi-byte
60    character. the fields mirror certain local variables in sfvscanf.  */
61 typedef struct _scan_s
62 {	int	error;	/* get set by _sfdscan if no value specified	*/
63 	int	inp;	/* last input character read			*/
64 	int	width;	/* field width					*/
65 	Sfio_t	*f;	/* stream being scanned				*/
66 	uchar	*d, *endd, *data;	/* local buffering system	*/
67 	int	peek;	/* != 0 if unseekable/share stream		*/
68 	int	n_input;/* number of input bytes processed		*/
69 } Scan_t;
70 
71 /* ds != 0 for scanning double values */
72 #define SCinit(sc,ds)	((sc)->inp = (sc)->error = -1, (sc)->f = f, \
73 			 ((sc)->width = (ds) ? width : -1), \
74 			 (sc)->d = d, (sc)->endd = endd, (sc)->data = data, \
75 			 (sc)->peek = peek, (sc)->n_input = n_input)
76 #define SCend(sc,ds)	(inp = (sc)->inp, f = (sc)->f, \
77 			 (width = (ds) ? (sc)->width : width), \
78 			 d = (sc)->d, endd = (sc)->endd, data = (sc)->data, \
79 			 peek = (sc)->peek, n_input = (sc)->n_input)
80 
81 #if __STD_C
82 static int _scgetc(void* arg, int flag)
83 #else
84 static int _scgetc(arg, flag)
85 void*	arg;
86 int	flag;
87 #endif
88 {
89 	Scan_t	*sc = (Scan_t*)arg;
90 
91 	if (flag)
92 	{	sc->error = flag;
93 		return 0;
94 	}
95 
96 	/* if width >= 0, do not allow to exceed width number of bytes */
97 	if(sc->width == 0)
98 	{	sc->inp = -1;
99 		return 0;
100 	}
101 
102 	if(sc->d >= sc->endd) /* refresh local buffer */
103 	{	sc->n_input += sc->d - sc->data;
104 		if(sc->peek)
105 			SFREAD(sc->f, sc->data, sc->d - sc->data);
106 		else	sc->f->next = sc->d;
107 
108 		_sfbuf(sc->f, &sc->peek);
109 		sc->data = sc->d = sc->f->next;
110 		sc->endd = sc->f->endb;
111 
112 		if(sc->d >= sc->endd)
113 		{	sc->inp = -1;
114 			return 0;
115 		}
116 	}
117 
118 	if((sc->width -= 1) >= 0) /* from _sfdscan */
119 		return (sc->inp = (int)(*sc->d++));
120 	else	return ((int)(*sc->d++));
121 }
122 
123 /* structure to match characters in a character class */
124 typedef struct _accept_s
125 {	char	ok[SF_MAXCHAR+1];
126 	int	yes;
127 	char	*form, *endf;
128 #if _has_multibyte
129 	wchar_t	wc;
130 #endif
131 } Accept_t;
132 
133 #if __STD_C
134 static char* _sfsetclass(const char* form, Accept_t* ac, int flags)
135 #else
136 static char* _sfsetclass(form, ac, flags)
137 char*		form;	/* format string			*/
138 Accept_t*	ac;	/* values of accepted characters	*/
139 int		flags;	/* SFFMT_LONG for wchar_t		*/
140 #endif
141 {
142 	int		c, endc, n;
143 #if _has_multibyte
144 	SFMBDCL(mbs)
145 #endif
146 
147 	if(*form == '^') /* complementing this set */
148 	{	ac->yes = 0;
149 		form += 1;
150 	}
151 	else	ac->yes = 1;
152 
153 	for(c = 0; c <= SF_MAXCHAR; ++c)
154 		ac->ok[c] = !ac->yes;
155 
156 	if(*form == ']' || *form == '-') /* special first char */
157 	{	ac->ok[*form] = ac->yes;
158 		form += 1;
159 	}
160 	ac->form = (char*)form;
161 
162 	if(flags&SFFMT_LONG)
163 		SFMBCLR(&mbs);
164 	for(n = 1; *form != ']'; form += n)
165 	{	if((c = *((uchar*)form)) == 0)
166 			return NIL(char*);
167 
168 		if(*(form+1) == '-')
169 		{	endc = *((uchar*)(form+2));
170 #if _has_multibyte
171 			if(c >= 128 || endc >= 128 ) /* range must be ascii */
172 				goto one_char;
173 #endif
174 			for(; c <= endc; ++c)
175 				ac->ok[c] = ac->yes;
176 			n = 3;
177 		}
178 		else
179 		{ one_char:
180 #if _has_multibyte /* true multi-byte chars must be checked differently */
181 			if((flags&SFFMT_LONG) && (n = (int)SFMBLEN(form,&mbs)) <= 0)
182 				return NIL(char*);
183 			if(n == 1)
184 #endif
185 				ac->ok[c] = ac->yes;
186 		}
187 	}
188 
189 	ac->endf = (char*)form;
190 	return (char*)(form+1);
191 }
192 
193 #if _has_multibyte
194 #if __STD_C
195 static int _sfwaccept(wchar_t wc, Accept_t* ac)
196 #else
197 static int _sfwaccept(wc, ac)
198 wchar_t		wc;
199 Accept_t*	ac;
200 #endif
201 {
202 	int		endc, c, n;
203 	wchar_t		fwc;
204 	char		*form = ac->form;
205 	SFMBDCL(mbs)
206 
207 	SFMBCLR(&mbs);
208 	for(n = 1; *form != ']'; form += n)
209 	{	if((c = *((uchar*)form)) == 0)
210 			return 0;
211 
212 		if(*(form+1) == '-')
213 		{	endc = *((uchar*)(form+2));
214 			if(c >= 128 || endc >= 128 ) /* range must be ascii */
215 				goto one_char;
216 			n = 3;
217 		}
218 		else
219 		{ one_char:
220 			if((n = mbrtowc(&fwc, form, ac->endf-form, &mbs)) > 1 &&
221 			   wc == fwc )
222 				return ac->yes;
223 		}
224 	}
225 
226 	return !ac->yes;
227 }
228 
229 #if _has_multibyte == 1
230 #define SFgetwc(sc,wc,fmt,ac,mbs)	_sfgetwc(sc,wc,fmt,ac,(Void_t*)(mbs))
231 #else
232 #define SFgetwc(sc,wc,fmt,ac,mbs)	_sfgetwc(sc,wc,fmt,ac,NIL(Void_t*))
233 #endif
234 
235 #if __STD_C
236 static int _sfgetwc(Scan_t* sc, wchar_t* wc, int fmt, Accept_t* ac, Void_t *mbs)
237 #else
238 static int _sfgetwc(sc, wc, fmt, ac, mbs)
239 Scan_t*		sc;	/* the scanning handle		*/
240 wchar_t*	wc;	/* to return a scanned wchar_t	*/
241 int		fmt;	/* %s, %c, %[			*/
242 Accept_t*	ac;	/* accept handle for %[		*/
243 Void_t*		mbs;	/* multibyte parsing state	*/
244 #endif
245 {
246 	int	n, v;
247 	char	b[16]; /* assuming that SFMBMAX <= 16! */
248 
249 	/* shift left data so that there will be more room to back up on error.
250 	   this won't help streams with small buffers - c'est la vie! */
251 	if(sc->d > sc->f->data && (n = sc->endd - sc->d) > 0 && n < SFMBMAX)
252 	{	memcpy(sc->f->data, sc->d, n);
253 		if(sc->f->endr == sc->f->endb)
254 			sc->f->endr = sc->f->data+n;
255 		if(sc->f->endw == sc->f->endb)
256 			sc->f->endw = sc->f->data+n;
257 		sc->f->endb = sc->f->data+n;
258 		sc->d = sc->data = sc->f->data;
259 		sc->endd = sc->f->endb;
260 		if(!mbs) sc->f->endb = sc->endd; /* stop cc's "unused mbs" warning */
261 	}
262 
263 	for(n = 0; n < SFMBMAX; )
264 	{	if((v = _scgetc((Void_t*)sc, 0)) <= 0)
265 			goto no_match;
266 		else	b[n++] = v;
267 
268 		if(mbrtowc(wc, b, n, (mbstate_t*)mbs) == (size_t)(-1))
269 			goto no_match;  /* malformed multi-byte char */
270 		else
271 		{	/* multi-byte char converted successfully */
272 			if(fmt == 'c')
273 				return 1;
274 			else if(fmt == 's')
275 			{	if(n > 1 || (n == 1 && !isspace(b[0]) ) )
276 					return 1;
277 				else	goto no_match;
278 			}
279 			else if(fmt == '[')
280 			{	if((n == 1 && ac->ok[b[0]]) ||
281 				   (n  > 1 && _sfwaccept(*wc,ac)) )
282 					return 1;
283 				else	goto no_match;
284 			}
285 			else /* if(fmt == '1') match a single wchar_t */
286 			{	if(*wc == ac->wc)
287 					return 1;
288 				else	goto no_match;
289 			}
290 		}
291 	}
292 
293 no_match: /* this unget is lossy on a stream with small buffer */
294 	if((sc->d -= n) < sc->data)
295 		sc->d = sc->data;
296 	return 0;
297 }
298 #endif /*_has_multibyte*/
299 
300 
301 #if __STD_C
302 int sfvscanf(Sfio_t* f, reg const char* form, va_list args)
303 #else
304 int sfvscanf(f,form,args)
305 Sfio_t*		f;		/* file to be scanned */
306 reg char*	form;		/* scanning format */
307 va_list		args;
308 #endif
309 {
310 	reg int		inp, shift, base, width;
311 	ssize_t		size;
312 	int		fmt, flags, dot, n_assign, v, n, n_input;
313 	char		*sp;
314 
315 	Accept_t	acc;
316 
317 	Argv_t		argv;
318 	Sffmt_t		*ft;
319 	Fmt_t		*fm, *fmstk;
320 
321 	Fmtpos_t*	fp;
322 	char		*oform;
323 	va_list		oargs;
324 	int		argp, argn;
325 
326 	int		decimal = 0, thousand = 0;
327 
328 #if _has_multibyte
329 	wchar_t		wc;
330 	SFMBDCL(fmbs)
331 	SFMBDCL(mbs)
332 #endif
333 
334 	Void_t*		value;	/* location to assign scanned value */
335 	char*		t_str;
336 	ssize_t		n_str;
337 
338 	/* local buffering system */
339 	Scan_t		scd;
340 	uchar		*d, *endd, *data;
341 	int		peek;
342 #define SFbuf(f)	(_sfbuf(f,&peek), (data = d = f->next), (endd = f->endb) )
343 #define SFlen(f)	(d - data)
344 #define SFinit(f)	((peek = f->extent < 0 && (f->flags&SF_SHARE)), SFbuf(f) )
345 #define SFend(f)	((n_input += SFlen(f)), \
346 			 (peek ? SFREAD(f,(Void_t*)data,SFlen(f)) : ((f->next = d),0)) )
347 #define SFgetc(f,c)	((c) = (d < endd || (SFend(f), SFbuf(f), d < endd)) ? \
348 				(int)(*d++) : -1 )
349 #define SFungetc(f,c)	(d -= 1)
350 
351 	SFMTXDECL(f);
352 
353 	SFCVINIT();	/* initialize conversion tables */
354 
355 	SFMTXENTER(f,-1);
356 
357 	if(!form || f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)
358 		SFMTXRETURN(f, -1);
359 	SFLOCK(f,0);
360 
361 	SFinit(f); /* initialize local buffering system */
362 
363 	n_assign = n_input = 0; inp = -1;
364 
365 	fmstk = NIL(Fmt_t*);
366 	ft = NIL(Sffmt_t*);
367 
368 	fp = NIL(Fmtpos_t*);
369 	argn = -1;
370 	oform = (char*)form;
371 	va_copy(oargs,args);
372 
373 	SFSETLOCALE(&decimal, &thousand);
374 
375 loop_fmt:
376 	SFMBCLR(&fmbs);
377 	while((fmt = *form++))
378 	{	if(fmt != '%')
379 		{	if(isspace(fmt))
380 			{	if(fmt != '\n' || !(f->flags&SF_LINE))
381 					fmt = -1;
382 				for(;;)
383 				{	if(SFgetc(f,inp) < 0 || inp == fmt)
384 						goto loop_fmt;
385 					else if(!isspace(inp))
386 					{	SFungetc(f,inp);
387 						goto loop_fmt;
388 					}
389 				}
390 			}
391 			else
392 			{ match_1:
393 #if _has_multibyte
394 				if((n = (int)mbrtowc(&wc,form-1,SFMBMAX,&fmbs)) <= 0)
395 					goto pop_fmt;
396 				if(n > 1)
397 				{	acc.wc = wc;
398 					SCinit(&scd,0); SFMBCLR(&mbs);
399 					v = SFgetwc(&scd, &wc, '1', &acc, &mbs);
400 					SCend(&scd,0);
401 					if(v == 0)
402 						goto pop_fmt;
403 					form += n-1;
404 				}
405 				else
406 #endif
407 				if(SFgetc(f,inp) != fmt)
408 				{	if(inp < 0)
409 						goto done;
410 					SFungetc(f,inp);
411 					goto pop_fmt;
412 				}
413 			}
414 			continue;
415 		}
416 
417 		if(*form == '%')
418 		{	form += 1;
419 			do SFgetc(f,inp); while(isspace(inp)); /* skip starting blanks */
420 			SFungetc(f,inp);
421 			goto match_1;
422 		}
423 
424 		if(*form == '\0')
425 			goto pop_fmt;
426 
427 		if(*form == '*')
428 		{	flags = SFFMT_SKIP;
429 			form += 1;
430 		}
431 		else	flags = 0;
432 
433 		/* matching some pattern */
434 		base = 10; size = -1;
435 		width = dot = 0;
436 		t_str = NIL(char*); n_str = 0;
437 		value = NIL(Void_t*);
438 		argp = -1;
439 
440 	loop_flags:	/* LOOP FOR FLAGS, WIDTH, BASE, TYPE */
441 		switch((fmt = *form++) )
442 		{
443 		case LEFTP : /* get the type which is enclosed in balanced () */
444 			t_str = (char*)form;
445 			for(v = 1;;)
446 			{	switch(*form++)
447 				{
448 				case 0 :	/* not balanceable, retract */
449 					form = t_str;
450 					t_str = NIL(char*);
451 					n_str = 0;
452 					goto loop_flags;
453 				case LEFTP :	/* increasing nested level */
454 					v += 1;
455 					continue;
456 				case RIGHTP :	/* decreasing nested level */
457 					if((v -= 1) != 0)
458 						continue;
459 					if(*t_str != '*' )
460 						n_str = (form-1) - t_str;
461 					else
462 					{	t_str = (*_Sffmtintf)(t_str+1,&n);
463 						if(*t_str == '$')
464 						{	if(!fp &&
465 							   !(fp = (*_Sffmtposf)(f,oform,oargs,ft,1)) )
466 								goto pop_fmt;
467 							n = FP_SET(n,argn);
468 						}
469 						else	n = FP_SET(-1,argn);
470 
471 						if(fp)
472 						{	t_str = fp[n].argv.s;
473 							n_str = fp[n].ft.size;
474 						}
475 						else if(ft && ft->extf )
476 						{	FMTSET(ft, form,args,
477 								LEFTP, 0, 0, 0,0,0,
478 								NIL(char*),0);
479 							n = (*ft->extf)
480 							      (f,(Void_t*)&argv,ft);
481 							if(n < 0)
482 								goto pop_fmt;
483 							if(!(ft->flags&SFFMT_VALUE) )
484 								goto t_arg;
485 							if((t_str = argv.s) &&
486 							   (n_str = (int)ft->size) < 0)
487 								n_str = strlen(t_str);
488 						}
489 						else
490 						{ t_arg:
491 							if((t_str = va_arg(args,char*)) )
492 								n_str = strlen(t_str);
493 						}
494 					}
495 					goto loop_flags;
496 				}
497 			}
498 
499 		case '#' : /* alternative format */
500 			flags |= SFFMT_ALTER;
501 			goto loop_flags;
502 
503 		case '.' : /* width & base */
504 			dot += 1;
505 			if(isdigit(*form))
506 			{	fmt = *form++;
507 				goto dot_size;
508 			}
509 			else if(*form == '*')
510 			{	form = (*_Sffmtintf)(form+1,&n);
511 				if(*form == '$')
512 				{	form += 1;
513 					if(!fp &&
514 					   !(fp = (*_Sffmtposf)(f,oform,oargs,ft,1)) )
515 						goto pop_fmt;
516 					n = FP_SET(n,argn);
517 				}
518 				else	n = FP_SET(-1,argn);
519 
520 				if(fp)
521 					v = fp[n].argv.i;
522 				else if(ft && ft->extf )
523 				{	FMTSET(ft, form,args, '.',dot, 0, 0,0,0,
524 						NIL(char*), 0);
525 					if((*ft->extf)(f, (Void_t*)(&argv), ft) < 0)
526 						goto pop_fmt;
527 					if(ft->flags&SFFMT_VALUE)
528 						v = argv.i;
529 					else	v = (dot <= 2) ? va_arg(args,int) : 0;
530 				}
531 				else	v = (dot <= 2) ? va_arg(args,int) : 0;
532 				if(v < 0)
533 					v = 0;
534 				goto dot_set;
535 			}
536 			else	goto loop_flags;
537 
538 		case '0' : case '1' : case '2' : case '3' : case '4' :
539 		case '5' : case '6' : case '7' : case '8' : case '9' :
540 		dot_size :
541 			for(v = fmt-'0'; isdigit(*form); ++form)
542 				v = v*10 + (*form - '0');
543 
544 			if(*form == '$')
545 			{	form += 1;
546 				if(!fp && !(fp = (*_Sffmtposf)(f,oform,oargs,ft,1)) )
547 					goto pop_fmt;
548 				argp = v-1;
549 				goto loop_flags;
550 			}
551 
552 		dot_set :
553 			if(dot == 0 || dot == 1)
554 				width = v;
555 			else if(dot == 2)
556 				base = v;
557 			goto loop_flags;
558 
559 		case 'I' : /* object size */
560 			size = -1; flags = (flags & ~SFFMT_TYPES) | SFFMT_IFLAG;
561 			if(isdigit(*form))
562 			{	for(size = 0, n = *form; isdigit(n); n = *++form)
563 					size = size*10 + (n - '0');
564 			}
565 			else if(*form == '*')
566 			{	form = (*_Sffmtintf)(form+1,&n);
567 				if(*form == '$')
568 				{	form += 1;
569 					if(!fp &&
570 					   !(fp = (*_Sffmtposf)(f,oform,oargs,ft,1)))
571 						goto pop_fmt;
572 					n = FP_SET(n,argn);
573 				}
574 				else	n = FP_SET(-1,argn);
575 
576 				if(fp)	/* use position list */
577 					size = fp[n].argv.i;
578 				else if(ft && ft->extf )
579 				{	FMTSET(ft, form,args, 'I',sizeof(int), 0, 0,0,0,
580 						NIL(char*), 0);
581 					if((*ft->extf)(f, (Void_t*)(&argv), ft) < 0)
582 						goto pop_fmt;
583 					if(ft->flags&SFFMT_VALUE)
584 						size = argv.i;
585 					else	size = va_arg(args,int);
586 				}
587 				else	size = va_arg(args,int);
588 			}
589 			goto loop_flags;
590 
591 		case 'l' :
592 			size = -1; flags &= ~SFFMT_TYPES;
593 			if(*form == 'l')
594 			{	form += 1;
595 				flags |= SFFMT_LLONG;
596 			}
597 			else	flags |= SFFMT_LONG;
598 			goto loop_flags;
599 		case 'h' :
600 			size = -1; flags &= ~SFFMT_TYPES;
601 			if(*form == 'h')
602 			{	form += 1;
603 				flags |= SFFMT_SSHORT;
604 			}
605 			else	flags |= SFFMT_SHORT;
606 			goto loop_flags;
607 		case 'L' :
608 			size = -1; flags = (flags&~SFFMT_TYPES) | SFFMT_LDOUBLE;
609 			goto loop_flags;
610 		case 'j' :
611 			size = -1; flags = (flags&~SFFMT_TYPES) | SFFMT_JFLAG;
612 			goto loop_flags;
613 		case 'z' :
614 			size = -1; flags = (flags&~SFFMT_TYPES) | SFFMT_ZFLAG;
615 			goto loop_flags;
616 		case 't' :
617 			size = -1; flags = (flags&~SFFMT_TYPES) | SFFMT_TFLAG;
618 			goto loop_flags;
619 		case QUOTE :
620 			if(thousand > 0)
621 				flags |= SFFMT_THOUSAND;
622 			goto loop_flags;
623 		}
624 
625 		/* set object size for scalars */
626 		if(flags & SFFMT_TYPES)
627 		{	if((_Sftype[fmt]&(SFFMT_INT|SFFMT_UINT)) || fmt == 'n')
628 			{	if(flags&SFFMT_LONG)
629 					size = sizeof(long);
630 				else if(flags&SFFMT_SHORT)
631 					size = sizeof(short);
632 				else if(flags&SFFMT_SSHORT)
633 					size = sizeof(char);
634 				else if(flags&SFFMT_TFLAG)
635 					size = sizeof(ptrdiff_t);
636 				else if(flags&SFFMT_ZFLAG)
637 					size = sizeof(size_t);
638 				else if(flags&(SFFMT_LLONG|SFFMT_JFLAG) )
639 					size = sizeof(Sflong_t);
640 				else if(flags&SFFMT_IFLAG)
641 				{	if(size <= 0 ||
642 					   size == sizeof(Sflong_t)*CHAR_BIT )
643 						size = sizeof(Sflong_t);
644 				}
645 				else if(size < 0)
646 					size = sizeof(int);
647 			}
648 			else if(_Sftype[fmt]&SFFMT_FLOAT)
649 			{	if(flags&(SFFMT_LONG|SFFMT_LLONG))
650 					size = sizeof(double);
651 				else if(flags&SFFMT_LDOUBLE)
652 					size = sizeof(Sfdouble_t);
653 				else if(flags&SFFMT_IFLAG)
654 				{	if(size <= 0)
655 						size = sizeof(Sfdouble_t);
656 				}
657 				else if(size < 0)
658 					size = sizeof(float);
659 			}
660 			else if(_Sftype[fmt]&SFFMT_CHAR)
661 			{
662 #if _has_multibyte
663 				if((flags&SFFMT_LONG) || fmt == 'C')
664 				{	size = sizeof(wchar_t) > sizeof(int) ?
665 						sizeof(wchar_t) : sizeof(int);
666 				} else
667 #endif
668 				if(size < 0)
669 					size = sizeof(int);
670 			}
671 		}
672 
673 		argp = FP_SET(argp,argn);
674 		if(fp)
675 		{	if(!(fp[argp].ft.flags&SFFMT_SKIP) )
676 			{	n_assign += 1;
677 				value = fp[argp].argv.vp;
678 				size = fp[argp].ft.size;
679 				if(ft && ft->extf && fp[argp].ft.fmt != fp[argp].fmt)
680 					fmt = fp[argp].ft.fmt;
681 			}
682 			else	flags |= SFFMT_SKIP;
683 		}
684 		else if(ft && ft->extf)
685 		{	FMTSET(ft, form,args, fmt, size,flags, width,0,base, t_str,n_str);
686 			SFend(f); SFOPEN(f,0);
687 			v = (*ft->extf)(f, (Void_t*)&argv, ft);
688 			SFLOCK(f,0); SFbuf(f);
689 
690 			if(v < 0)
691 				goto pop_fmt;
692 			else if(v > 0) /* extf comsumed v input bytes */
693 			{	n_input += v;
694 				if(!(ft->flags&SFFMT_SKIP) )
695 					n_assign += 1;
696 				continue;
697 			}
698 			else /* if(v == 0): extf did not use input stream */
699 			{	FMTGET(ft, form,args, fmt, size, flags, width,n,base);
700 
701 				if((ft->flags&SFFMT_VALUE) && !(ft->flags&SFFMT_SKIP) )
702 					value = argv.vp;
703 			}
704 		}
705 
706 		if(_Sftype[fmt] == 0) /* unknown pattern */
707 			goto pop_fmt;
708 
709 		if(fmt == '!')
710 		{	if(!fp)
711 				fp = (*_Sffmtposf)(f,oform,oargs,ft,1);
712 			else	goto pop_fmt;
713 
714 			if(!(argv.ft = va_arg(args,Sffmt_t*)) )
715 				continue;
716 			if(!argv.ft->form && ft ) /* change extension functions */
717 			{	if(ft->eventf &&
718 				   (*ft->eventf)(f,SF_DPOP,(Void_t*)form,ft) < 0)
719 					continue;
720 				fmstk->ft = ft = argv.ft;
721 			}
722 			else			/* stack a new environment */
723 			{	if(!(fm = (Fmt_t*)malloc(sizeof(Fmt_t))) )
724 					goto done;
725 
726 				ft = fm->ft = argv.ft;
727 				SFMBSET(ft->mbs, &fmbs);
728 				if(ft->form)
729 				{	fm->form = (char*)form; SFMBCPY(&fm->mbs,&fmbs);
730 					va_copy(fm->args,args);
731 
732 					fm->oform = oform;
733 					va_copy(fm->oargs,oargs);
734 					fm->argn = argn;
735 					fm->fp = fp;
736 
737 					form = ft->form; SFMBCLR(ft->mbs);
738 					va_copy(args,ft->args);
739 					argn = -1;
740 					fp = NIL(Fmtpos_t*);
741 					oform = (char*)form;
742 					va_copy(oargs,args);
743 				}
744 				else	fm->form = NIL(char*);
745 
746 				fm->eventf = ft->eventf;
747 				fm->next = fmstk;
748 				fmstk = fm;
749 			}
750 			continue;
751 		}
752 
753 		/* get the address to assign value */
754 		if(!value && !(flags&SFFMT_SKIP) )
755 			value = va_arg(args,Void_t*);
756 
757 		if(fmt == 'n') /* return length of consumed input */
758 		{
759 #if !_ast_intmax_long
760 			if(size == sizeof(Sflong_t) )
761 				*((Sflong_t*)value) = (Sflong_t)(n_input+SFlen(f));
762 			else
763 #endif
764 			if(size == sizeof(long) )
765 				*((long*)value) = (long)(n_input+SFlen(f));
766 			else if(size == sizeof(short) )
767 				*((short*)value) = (short)(n_input+SFlen(f));
768 			else if(size == sizeof(uchar))
769 				*((uchar*)value) = (uchar)(n_input+SFlen(f));
770 			else	*((int*)value) = (int)(n_input+SFlen(f));
771 			continue;
772 		}
773 
774 		/* if get here, start scanning input */
775 		if(width == 0)
776 			width = fmt == 'c' ? 1 : MAXWIDTH;
777 
778 		/* define the first input character */
779 		if(fmt == 'c' || fmt == '[' || fmt == 'C' )
780 			SFgetc(f,inp);
781 		else
782 		{	do	{ SFgetc(f,inp); }
783 			while(isspace(inp)); /* skip starting blanks */
784 		}
785 		if(inp < 0)
786 			goto done;
787 
788 		if(_Sftype[fmt] == SFFMT_FLOAT)
789 		{	SFungetc(f,inp); SCinit(&scd,1);
790 			argv.ld = _sfdscan((Void_t*)(&scd), _scgetc);
791 			SCend(&scd,1);
792 
793 			if(scd.error >= 0)
794 			{	if(inp >= 0)
795 					SFungetc(f, inp);
796 				goto pop_fmt;
797 			}
798 
799 			if(value)
800 			{
801 #if !_ast_fltmax_double
802 				if(size == sizeof(Sfdouble_t))
803 					*((Sfdouble_t*)value) = argv.ld;
804 				else
805 #endif
806 				if(size == sizeof(double))
807 					*((double*)value) = (double)argv.ld;
808 				else	*((float*)value) = (float)argv.ld;
809 
810 				n_assign += 1;
811 			}
812 		}
813 		else if(_Sftype[fmt] == SFFMT_UINT || fmt == 'p')
814 		{	if(inp == '-')
815 			{	SFungetc(f,inp);
816 				goto pop_fmt;
817 			}
818 			else	goto int_cvt;
819 		}
820 		else if(_Sftype[fmt] == SFFMT_INT)
821 		{ int_cvt:
822 			if(inp == '-' || inp == '+')
823 			{	if(inp == '-')
824 					flags |= SFFMT_MINUS;
825 				while(--width > 0 && SFgetc(f,inp) >= 0)
826 					if(!isspace(inp))
827 						break;
828 			}
829 			if(inp < 0)
830 				goto done;
831 
832 			if(fmt == 'o')
833 				base = 8;
834 			else if(fmt == 'x' || fmt == 'X' || fmt == 'p')
835 				base = 16;
836 			else if(fmt == 'i' && inp == '0') /* self-described data */
837 			{	base = 8;
838 				if(width > 1) /* peek to see if it's a base-16 */
839 				{	if(SFgetc(f,inp) >= 0)
840 					{	if(inp == 'x' || inp == 'X')
841 							base = 16;
842 						SFungetc(f,inp);
843 					}
844 					inp = '0';
845 				}
846 			}
847 
848 			/* now convert */
849 			argv.lu = 0;
850 			if(base == 16)
851 			{	sp = (char*)_Sfcv36;
852 				shift = 4;
853 				if(sp[inp] >= 16)
854 				{	SFungetc(f,inp);
855 					goto pop_fmt;
856 				}
857 				if(inp == '0' && --width > 0)
858 				{	/* skip leading 0x or 0X */
859 					if(SFgetc(f,inp) >= 0 &&
860 					   (inp == 'x' || inp == 'X') && --width > 0)
861 						SFgetc(f,inp);
862 				}
863 				if(inp >= 0 && sp[inp] < 16)
864 					goto base_shift;
865 			}
866 			else if(base == 10)
867 			{	for(n = v = 0;; )
868 				{	/* fast base 10 conversion */
869 #define TEN(x) (((x) << 3) + ((x) << 1) )
870 					if (inp >= '0' && inp <= '9')
871 					{	argv.lu = TEN(argv.lu) + (inp-'0');
872 						n += 1;
873 					}
874 					else if(inp == thousand)
875 					{	if((v && n != 3) || (!v && n > 3) )
876 							break;
877 						v = 1; n = 0;
878 					}
879 					else	break;
880 					if((width -= 1) <= 0 || SFgetc(f,inp) < 0)
881 						break;
882 				}
883 				if (!n && !v)
884 				{	SFungetc(f,inp);
885 					goto pop_fmt;
886 				}
887 
888 				if(fmt == 'i' && inp == '#' && !(flags&SFFMT_ALTER) )
889 				{	base = (int)argv.lu;
890 					if(base < 2 || base > SF_RADIX)
891 						goto pop_fmt;
892 					argv.lu = 0;
893 					sp = (char*)(base <= 36 ? _Sfcv36 : _Sfcv64);
894 					if(--width > 0 &&
895 					   SFgetc(f,inp) >= 0 && sp[inp] < base)
896 						goto base_conv;
897 				}
898 			}
899 			else
900 			{	/* other bases */
901 				sp = (char*)(base <= 36 ? _Sfcv36 : _Sfcv64);
902 				if(base < 2 || base > SF_RADIX || sp[inp] >= base)
903 				{	SFungetc(f,inp);
904 					goto pop_fmt;
905 				}
906 
907 			base_conv: /* check for power of 2 conversions */
908 				if((base & ~(base-1)) == base)
909 				{	if(base < 8)
910 						shift = base <  4 ? 1 : 2;
911 					else if(base < 32)
912 						shift = base < 16 ? 3 : 4;
913 					else	shift = base < 64 ? 5 : 6;
914 
915 			base_shift:	do
916 					{ argv.lu = (argv.lu << shift) + sp[inp];
917 					} while(--width > 0 &&
918 					        SFgetc(f,inp) >= 0 && sp[inp] < base);
919 				}
920 				else
921 				{	do
922 					{ argv.lu = (argv.lu * base) + sp[inp];
923 					} while(--width > 0 &&
924 						SFgetc(f,inp) >= 0 && sp[inp] < base);
925 				}
926 			}
927 
928 			if(flags&SFFMT_MINUS)
929 				argv.ll = -argv.ll;
930 
931 			if(value)
932 			{	n_assign += 1;
933 
934 				if(fmt == 'p')
935 #if _more_void_int
936 					*((Void_t**)value) = (Void_t*)((ulong)argv.lu);
937 #else
938 					*((Void_t**)value) = (Void_t*)((uint)argv.lu);
939 #endif
940 #if !_ast_intmax_long
941 				else if(size == sizeof(Sflong_t))
942 					*((Sflong_t*)value) = argv.ll;
943 #endif
944 				else if(size == sizeof(long))
945 				{	if(fmt == 'd' || fmt == 'i')
946 						*((long*)value) = (long)argv.ll;
947 					else	*((ulong*)value) = (ulong)argv.lu;
948 				}
949 				else if(size == sizeof(short))
950 				{	if(fmt == 'd' || fmt == 'i')
951 						*((short*)value) = (short)argv.ll;
952 					else	*((ushort*)value) = (ushort)argv.lu;
953 				}
954 				else if(size == sizeof(char) )
955 				{	if(fmt == 'd' || fmt == 'i')
956 						*((char*)value) = (char)argv.ll;
957 					else	*((uchar*)value) = (uchar)argv.lu;
958 				}
959 				else
960 				{	if(fmt == 'd' || fmt == 'i')
961 						*((int*)value) = (int)argv.ll;
962 					else	*((uint*)value) = (uint)argv.lu;
963 				}
964 			}
965 		}
966 		else if(fmt == 'C' || fmt == 'S')
967 		{	fmt = fmt == 'C' ? 'c' : 's';
968 			flags = (flags & ~SFFMT_TYPES) | SFFMT_LONG;
969 			goto do_string;
970 		}
971 		else if(fmt == 's' || fmt == 'c' || fmt == '[' )
972 		{ do_string:
973 			if(value)
974 			{	if(size < 0)
975 					size = MAXWIDTH;
976 				if(fmt != 'c')
977 					size -= 1;
978 #if _has_multibyte
979 				if(flags&SFFMT_LONG)
980 					argv.ws = (wchar_t*)value;
981 				else
982 #endif
983 					argv.s = (char*)value;
984 			}
985 			else	size = 0;
986 
987 			if(fmt == '[' && !(form = _sfsetclass(form,&acc,flags)) )
988 			{	SFungetc(f,inp);
989 				goto pop_fmt;
990 			}
991 
992 			n = 0; /* count number of scanned characters */
993 #if _has_multibyte
994 			if(flags&SFFMT_LONG)
995 			{	SFungetc(f,inp); SCinit(&scd,0); SFMBCLR(&mbs);
996 				for(; width > 0; --width)
997 				{	if(SFgetwc(&scd,&wc,fmt,&acc,&mbs) == 0)
998 						break;
999 					if((n += 1) <= size)
1000 						*argv.ws++ = wc;
1001 				}
1002 				SCend(&scd,0);
1003 			}
1004 			else
1005 #endif
1006 
1007 			if(fmt == 's')
1008 			{	do
1009 				{	if(isspace(inp))
1010 						break;
1011 					if((n += 1) <= size)
1012 						*argv.s++ = inp;
1013 				} while(--width > 0 && SFgetc(f,inp) >= 0);
1014 			}
1015 			else if(fmt == 'c')
1016 			{	do
1017 			 	{	if((n += 1) <= size)
1018 						*argv.s++ = inp;
1019 				} while(--width > 0 && SFgetc(f,inp) >= 0);
1020 			}
1021 			else /* if(fmt == '[') */
1022 			{	do
1023 				{	if(!acc.ok[inp])
1024 					{	if(n > 0 || (flags&SFFMT_ALTER) )
1025 							break;
1026 						else
1027 						{	SFungetc(f,inp);
1028 							goto pop_fmt;
1029 						}
1030 					}
1031 					if((n += 1) <= size)
1032 						*argv.s++ = inp;
1033 				} while(--width > 0 && SFgetc(f,inp) >= 0);
1034 			}
1035 
1036 			if(value && (n > 0 || fmt == '[') )
1037 			{	n_assign += 1;
1038 				if(fmt != 'c' && size >= 0)
1039 				{
1040 #if _has_multibyte
1041 					if(flags&SFFMT_LONG)
1042 						*argv.ws = 0;
1043 					else
1044 #endif
1045 						*argv.s = 0;
1046 				}
1047 			}
1048 		}
1049 
1050 		if(width > 0 && inp >= 0)
1051 			SFungetc(f,inp);
1052 	}
1053 
1054 pop_fmt:
1055 	if(fp)
1056 	{	free(fp);
1057 		fp = NIL(Fmtpos_t*);
1058 	}
1059 	while((fm = fmstk) ) /* pop the format stack and continue */
1060 	{	if(fm->eventf)
1061 		{	if(!form || !form[0])
1062 				(*fm->eventf)(f,SF_FINAL,NIL(Void_t*),ft);
1063 			else if((*fm->eventf)(f,SF_DPOP,(Void_t*)form,ft) < 0)
1064 				goto loop_fmt;
1065 		}
1066 
1067 		fmstk = fm->next;
1068 		if((form = fm->form) )
1069 		{	SFMBCPY(&fmbs,&fm->mbs);
1070 			va_copy(args, fm->args);
1071 			oform = fm->oform;
1072 			va_copy(oargs,fm->oargs);
1073 			argn = fm->argn;
1074 			fp = fm->fp;
1075 		}
1076 		ft = fm->ft;
1077 		free(fm);
1078 		if(form && form[0])
1079 			goto loop_fmt;
1080 	}
1081 
1082 done:
1083 	if(fp)
1084 		free(fp);
1085 	while((fm = fmstk) )
1086 	{	if(fm->eventf)
1087 			(*fm->eventf)(f,SF_FINAL,NIL(Void_t*),fm->ft);
1088 		fmstk = fm->next;
1089 		free(fm);
1090 	}
1091 
1092 	SFend(f);
1093 
1094 	SFOPEN(f,0);
1095 
1096 	if(n_assign == 0 && inp < 0)
1097 		n_assign = -1;
1098 
1099 	SFMTXRETURN(f,n_assign);
1100 }
1101