summaryrefslogtreecommitdiff
path: root/libc/stdio/printf.c
blob: 36c23c2fccf00d4b6f6dbff165a6a2e07525f6c9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
/*
 * This file based on printf.c from 'Dlibs' on the atari ST  (RdeBath)
 *
 * 
 *    Dale Schumacher                         399 Beacon Ave.
 *    (alias: Dalnefre')                      St. Paul, MN  55104
 *    dal@syntel.UUCP                         United States of America
 *  "It's not reality that's important, but how you perceive things."
 */

/* Altered to use stdarg, made the core function vfnprintf.
 * Hooked into the stdio package using 'inside information'
 * Altered sizeof() assumptions, now assumes all integers except chars
 * will be either
 *  sizeof(xxx) == sizeof(long) or sizeof(xxx) == sizeof(short)
 *
 * -RDB
 */

/*
 *                    Manuel Novoa III   Dec 2000
 *
 * The previous vfnprintf routine was almost completely rewritten with the
 * goal of fixing some shortcomings and reducing object size.
 *
 * The summary of changes:
 *
 * Converted print conversion specification parsing from one big switch
 *   to a method using string tables.  This new method verifies that the
 *   conversion flags, field width, precision, qualifier, and specifier
 *   appear in the correct order.  Many questionable specifications were
 *   accepted by the previous code.  This new method also resulted in a
 *   substantial reduction in object size of about 330 bytes (20%) from
 *   the old version (1627 bytes) on i386, even with the following
 *   improvements.
 *
 *     Implemented %n specifier as required by the standards.
 *     Implemented proper handling of precision for int types.
 *     Implemented # for hex and pointer, fixed error for octal rep of 0.
 *     Implemented return of -1 on stream error.
 *
 * Added optional support for the GNU extension %m which prints the string
 *   corresponding the errno.
 *
 * Added optional support for long long ints and unsigned long long ints
 *   using the conversion qualifiers "ll", "L", or "q" (like glibc).
 *
 * Added optional support for doubles in a very limited form.  None of
 *   the formating options are obeyed.  The string returned by __dtostr
 *   is printed directly.
 *
 * Converted to use my (un)signed long (long) to string routines, which are
 * smaller than the previous functions and don't require static buffers.
 *
 * Other Modifications:
 *   Modified sprintf, snprintf, vsprintf, vsnprintf to share on fake-file.
 */

/*
 *                    Manuel Novoa III   Jan 2001
 *
 * Removed fake file from *s*printf functions because of possible problems
 *    if called recursively.  Instead, have sprintf, snprintf, and vsprintf
 *    call vsnprintf which allocates a fake file on the stack.
 * Removed WANT_FPUTC option.  Always use standard putc macro to avoid
 *    problems with the fake file used by the *s*printf functions.
 * Fixed bug parsing flags -- did not restart scan.
 * Added function asprintf.
 * Fixed 0-pad prefixing bug.
 * Converted sizeof(int) == sizeof(long) tests to compile time vs run time.
 *    This saves 112 bytes of code on i386.
 * Fixed precision bug -- when negative set to default.
 * Added function fnprintf to support __dtostr.
 * Added floating point support for doubles.  Yeah!
 * 
 *
 * May 2001     Fixes from Johan Adolfsson (johan.adolfsson@axis.com)
 *    1) printf("%c",0) returned 0 instead of 1.
 *    2) unrolled loop in asprintf to reduce size and remove compile warning.
 *
 */

/*****************************************************************************/
/*                            OPTIONS                                        */
/*****************************************************************************/
/* The optional support for long longs and doubles comes in two forms.
 *
 *   1) Normal (or partial for doubles) output support.  Set to 1 to turn on.
 *      Adds about 130 bytes for doubles, about 220 bytes for long longs,
 *      and about 275 for both to the base code size of 1163 on i386.
 */

/* These are now set in uClibc_config.h based on Config. */
/*
#define __UCLIBC_HAS_LONG_LONG__         1
#define __UCLIBC_HAS_FLOATS__            1
*/

/*   2) An error message is inserted into the stream, an arg of the
 *      appropriate size is removed from the arglist, and processing
 *      continues.  This is adds less code and may be useful in some
 *      cases.  Set to 1 to turn on.  Adds about 50 bytes for doubles,
 *      about 140 bytes for long longs, and about 175 bytes for both
 *      to the base code size of 1163 on i386.
 */

#define WANT_LONG_LONG_ERROR   0
#define WANT_FLOAT_ERROR      0

/*
 * Set to support GNU extension of %m to print string corresponding to errno.
 *
 * Warning: This adds about 50 bytes (i386) to the code but it also pulls in
 * strerror and the corresponding string table which together are about 3.8k.
 */

#define WANT_GNU_ERRNO         0

/**************************************************************************/

#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <assert.h>

#if WANT_GNU_ERRNO
#include <errno.h>
#endif

#ifdef __STDC__
#include <stdarg.h>
#define va_strt      va_start
#else
#include <varargs.h>
#define va_strt(p,i) va_start(p)
#endif

#include "stdio.h"

extern int vfnprintf(FILE * op, size_t max_size,
					 register __const char *fmt, register va_list ap);

#ifdef L_printf
int printf(const char *fmt, ...)
{
	va_list ptr;
	int rv;

	va_strt(ptr, fmt);
	rv = vfnprintf(stdout, -1, fmt, ptr);
	va_end(ptr);
	return rv;
}
#endif

#ifdef L_asprintf
int asprintf(char **app, const char *fmt, ...)
{
	va_list ptr;
	int rv;
	char *p;

	/*
	 * First iteration - find out size of buffer required and allocate it.
	 */
	va_strt(ptr, fmt);
	rv = vsnprintf(NULL, 0, fmt, ptr);
	va_end(ptr);

	p = malloc(++rv);			/* allocate the buffer */
	*app = p;
	if (!p) {
		return -1;
	}

	/*
	 * Second iteration - actually produce output.
	 */
	va_strt(ptr, fmt);
	rv = vsnprintf(p, rv, fmt, ptr);
	va_end(ptr);

	return rv;
}
#endif

#ifdef L_sprintf
int sprintf(char *sp, const char *fmt, ...)
{
	va_list ptr;
	int rv;

	va_strt(ptr, fmt);
	rv = vsnprintf(sp, -1, fmt, ptr);
	va_end(ptr);
	return rv;
}
#endif


#ifdef L_snprintf
int snprintf(char *sp, size_t size, const char *fmt, ...)
{
	va_list ptr;
	int rv;

	va_strt(ptr, fmt);
	rv = vsnprintf(sp, size, fmt, ptr);
	va_end(ptr);
	return rv;
}
#endif

#ifdef L_fprintf
int fprintf(FILE * fp, const char *fmt, ...)
{
	va_list ptr;
	int rv;

	va_strt(ptr, fmt);
	rv = vfnprintf(fp, -1, fmt, ptr);
	va_end(ptr);
	return rv;
}
#endif

#ifdef L_fnprintf
int fnprintf(FILE * fp, size_t size, const char *fmt, ...)
{
	va_list ptr;
	int rv;

	va_strt(ptr, fmt);
	rv = vfnprintf(fp, size, fmt, ptr);
	va_end(ptr);
	return rv;
}
#endif

#ifdef L_vprintf
int vprintf(const char *fmt, va_list ap)
{
	return vfprintf(stdout, fmt, ap);
}
#endif

#ifdef L_vfprintf

int vfprintf(FILE * op, register __const char *fmt, register va_list ap)
{
	return vfnprintf(op, -1, fmt, ap);
}

#endif

#ifdef L_vsprintf
int vsprintf(char *sp, __const char *fmt, va_list ap)
{
	return vsnprintf(sp, -1, fmt, ap);
}
#endif

#ifdef L_vsnprintf
int vsnprintf(char *sp, size_t size, __const char *fmt, va_list ap)
{
	int rv;
	FILE f;

	/*
	 * As we're only using the putc macro in vfnprintf, we don't need to
	 * initialize all FILE f's fields.
	 */
	f.bufwrite = (char *) ((unsigned) -1);
	f.bufpos = sp;
	f.mode = _IOFBF;

	rv = vfnprintf(&f, size, fmt, ap);
	if (size) {					/* If this is going to a buffer, */
		*(f.bufpos) = 0;		/* don't forget to nul-terminate. */
	}
	return rv;
}
#endif

#ifdef L_vdprintf
/*
 * Note: If fd has an associated buffered FILE, bad things happen.
 */
extern int vdprintf(int fd, const char *fmt, va_list ap)
{
	char buf[BUFSIZ];
	FILE f = {buf, 0, buf+sizeof(buf), buf, buf+sizeof(buf), 0, fd, _IOFBF};
	int rv;

	rv = vfnprintf(&f, -1, fmt, ap);

	if (fflush(&f)) {
		return -1;
	}

	return rv;
}
#endif

#ifdef L_vfnprintf

extern char *__ultostr(char *buf, unsigned long uval, int base, int uppercase);
extern char *__ltostr(char *buf, long val, int base, int uppercase);
extern char *__ulltostr(char *buf, unsigned long long uval, int base, int uppercase);
extern char *__lltostr(char *buf, long long val, int base, int uppercase);
extern int __dtostr(FILE * fp, size_t size, long double x,
				  char flag[], int width, int preci, char mode);

enum {
	FLAG_PLUS = 0,
	FLAG_MINUS_LJUSTIFY,
	FLAG_HASH,
	FLAG_0_PAD,
	FLAG_SPACE,
};

/* layout                   01234  */
static const char spec[] = "+-#0 ";

#if defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR
static const char qual[] = "hlLq";
#else
static const char qual[] = "hl";
#endif

#if !defined(__UCLIBC_HAS_LONG_LONG__) && WANT_LONG_LONG_ERROR
static const char ll_err[] = "<LONG-LONG>";
#endif

#if !defined(__UCLIBC_HAS_FLOATS__) && WANT_FLOAT_ERROR
static const char dbl_err[] = "<DOUBLE>";
#endif

#if defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR
/* layout                     012345678901234567   */
static const char u_spec[] = "%nbopxXudicsfgGeEaA";
#else
/* layout                     0123456789012   */
static const char u_spec[] = "%nbopxXudics";
#endif

/* WARNING: u_spec and u_radix need to stay in agreement!!! */
/* u_radix[i] <-> u_spec[i+2] for unsigned entries only */
static const char u_radix[] = "\x02\x08\x10\x10\x10\x0a";

int vfnprintf(FILE * op, size_t max_size, const char *fmt, va_list ap)
{
	int i, cnt, lval, len;
	char *p;
	const char *fmt0;
	int buffer_mode;
	int preci, width;
#define upcase i
	int radix, dpoint /*, upcase*/;
#if defined(__UCLIBC_HAS_LONG_LONG__)
	char tmp[65];
#else
	char tmp[33];
#endif
	char flag[sizeof(spec)];

	cnt = 0;

	/* This speeds things up a bit for line unbuffered */
	buffer_mode = (op->mode & __MODE_BUF);
	op->mode &= (~__MODE_BUF);

	while (*fmt) {
		if (*fmt == '%') {
			fmt0 = fmt;			/* save our position in case of bad format */
			++fmt;
			width = -1;			/* min field width */
			preci = -5;			/* max string width or mininum digits */
			radix = 10;			/* number base */
			dpoint = 0;			/* found decimal point */
#if INT_MAX != LONG_MAX
			lval = 0;			/* sizeof(int) != sizeof(long) */
#else
			lval = 1;			/* sizeof(int) == sizeof(long) */
#endif

			tmp[1] = 0;			/* set things up for %c -- better done here */

			/* init flags */
			for (p =(char *) spec ; *p ; p++) {
				flag[p-spec] = '\0';
			}
			flag[FLAG_0_PAD] = ' ';

			/* process optional flags */
			for (p = (char *)spec ; *p ; ) {
				if (*fmt == *p) {
					flag[p-spec] = *fmt++;
					p = (char *)spec; /* restart scan */
				} else {
					p++;
				}
			}
			
			if (!flag[FLAG_PLUS]) {
				flag[FLAG_PLUS] = flag[FLAG_SPACE];
			}

			/* process optional width and precision */
			do {
				if (*fmt == '.') {
					++fmt;
					dpoint = 1;
				}
				if (*fmt == '*') {	/* parameter width value */
					++fmt;
					i = va_arg(ap, int);
				} else {
					for ( i = 0 ; (*fmt >= '0') && (*fmt <= '9') ; ++fmt ) {
						i = (i * 10) + (*fmt - '0');
					}
				}

				if (dpoint) {
					preci = i;
					if (i<0) {
						preci = -5;
					}
				} else {
					width = i;
					if (i<0) {
						width = -i;
						flag[FLAG_MINUS_LJUSTIFY] = 1;
					}
				}
			} while ((*fmt == '.') && !dpoint );

			/* process optional qualifier */
			for (p = (char *) qual ; *p ; p++) {
				if (*p == *fmt) {
					lval = p - qual;
					++fmt;
#if defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR
					if ((*p == 'l') && (*fmt == *p)) {
						++lval;
						++fmt;
					}
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR */
				}
			}

#if WANT_GNU_ERRNO
			if (*fmt == 'm') {
				flag[FLAG_PLUS] = '\0';
				flag[FLAG_0_PAD] = ' ';
				p = strerror(errno);
				goto print;
			}
#endif

			/* process format specifier */
			for (p = (char *) u_spec ; *p ; p++) {
				if (*fmt != *p) continue;
				if (p-u_spec < 1) {	/* print a % */
					goto charout;
				}
				if (p-u_spec < 2) {	/* store output count in int ptr */
					*(va_arg(ap, int *)) = cnt;
					goto nextfmt;
				}
				if (p-u_spec < 8) { /* unsigned conversion */
					radix = u_radix[p-u_spec-2];
					upcase = ((int)'x') - *p;
					if (*p == 'p') {
						lval = (sizeof(char *) == sizeof(long));
						upcase = 0;
						flag[FLAG_HASH] = 1;
					}
#if defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR
					if (lval >= 2) {
#if defined(__UCLIBC_HAS_LONG_LONG__)
						p = __ulltostr(tmp + sizeof(tmp) - 1,
									   va_arg(ap, unsigned long long),
									   radix, upcase);
#else
						(void) va_arg(ap, unsigned long long);	/* cary on */
						p = (char *) ll_err;
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) */
					} else {
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR */
#if UINT_MAX != ULONG_MAX
						/* sizeof(unsigned int) != sizeof(unsigned long) */
						p = __ultostr(tmp + sizeof(tmp) - 1, (unsigned long)
									  ((lval)
									   ? va_arg(ap, unsigned long)
									   : va_arg(ap, unsigned int)),
									  radix, upcase);
#else
						/* sizeof(unsigned int) == sizeof(unsigned long) */
						p = __ultostr(tmp + sizeof(tmp) - 1, (unsigned long)
									  va_arg(ap, unsigned long),
									  radix, upcase);
#endif
#if defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR
					}
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR */
					flag[FLAG_PLUS] = '\0';	/* meaningless for unsigned */
					if (flag[FLAG_HASH] && (*p != '0')) { /* non-zero */
						if (radix == 8) {
							*--p = '0';	/* add leadding zero */
						} else if (radix != 10) { /* either 2 or 16 */
							flag[FLAG_PLUS] = '0';
							*--p = 'b';
							if (radix == 16) {
								*p = 'x';
								if (*fmt == 'X') {
									*p = 'X';
								}
							}
						}
					}
				} else if (p-u_spec < 10) { /* signed conversion */
#if defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR
					if (lval >= 2) {
#if defined(__UCLIBC_HAS_LONG_LONG__)
						p = __lltostr(tmp + sizeof(tmp) - 1,
									  va_arg(ap, long long), 10, 0);
#else
						(void) va_arg(ap, long long); /* carry on */
						p = (char *) ll_err;
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) */
					} else {
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR */
#if INT_MAX != LONG_MAX
						/* sizeof(int) != sizeof(long) */
						p = __ltostr(tmp + sizeof(tmp) - 1, (long)
									 ((lval)
									  ? va_arg(ap, long)
									  : va_arg(ap, int)), 10, 0);
#else
						/* sizeof(int) == sizeof(long) */
						p = __ltostr(tmp + sizeof(tmp) - 1, (long)
									 va_arg(ap, long), 10, 0);
#endif
#if defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR
					}
#endif /* defined(__UCLIBC_HAS_LONG_LONG__) || WANT_LONG_LONG_ERROR */
				} else if (p-u_spec < 12) {	/* character or string */
					flag[FLAG_PLUS] = '\0';
					flag[FLAG_0_PAD] = ' ';
					if (*p == 'c') {	/* character */
						p = tmp;
						*p = va_arg(ap, int);
						/* This takes care of the "%c",0 case */
						len = 1;
						goto print_len_set;
					} else {	/* string */
						p = va_arg(ap, char *);
						if (!p) {
							p = "(null)";
						}
					}
#if defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR
				} else if (p-u_spec < 27) {		/* floating point */
#endif /* defined(__UCLIBC_HAS_FLOATS__) || WANT_FLOAT_ERROR */
#if defined(__UCLIBC_HAS_FLOATS__)
					if (preci < 0) {
						preci = 6;
					}
					cnt += __dtostr(op, 
									(max_size > cnt ? max_size - cnt : 0),
									(long double) ((lval > 1)
									 ? va_arg(ap, long double)
									 : va_arg(ap, double)),
									flag, width,  preci, *fmt);
					goto nextfmt;
#elif WANT_FLOAT_ERROR
					(void) ((lval > 1) ? va_arg(ap, long double)
							: va_arg(ap, double)); /* carry on */
					p = (char *) dbl_err;
#endif /* defined(__UCLIBC_HAS_FLOATS__) */
				}

#if WANT_GNU_ERRNO
			print:
#endif
				{				/* this used to be printfield */
					/* cheaper than strlen call */
					for ( len = 0 ; p[len] ; len++ ) { }
				print_len_set:
					if ((*p == '-')
#if WANT_GNU_ERRNO
						&& (*fmt != 'm')
#endif
						&& (*fmt != 's')) {
						flag[FLAG_PLUS] = *p++;
						--len;
					}
				    if (flag[FLAG_PLUS]) {
						++len;
						++preci;
						if (flag[FLAG_PLUS] == '0') { /* base 16 */
							++preci; /* account for x or X */
						}
					}

					if (preci >= 0) {
						if ((*fmt == 's')
#if WANT_GNU_ERRNO
						|| (*fmt == 'm')
#endif
						) {
							if (len > preci) {
								len = preci;
							} else {
								preci = len;
							}
						}
						preci -= len;
						if (preci < 0) {
							preci = 0;
						}
						width -= preci;
					}

					width -= len;
					if (width < 0) {
						width = 0;
					}

					if (preci < 0) {
						preci = 0;
						if (!flag[FLAG_MINUS_LJUSTIFY]
							/* && flag[FLAG_PLUS] */
							&& (flag[FLAG_0_PAD] == '0')) { 
							preci = width;
							width = 0;
						}
					}

					while (width + len + preci) {
						unsigned char ch;
						/* right padding || left padding */
						if ((!len && !preci)
							|| (width && !flag[FLAG_MINUS_LJUSTIFY])) {
							ch = ' ';
							--width;
						} else if (flag[FLAG_PLUS]) {
							ch = flag[FLAG_PLUS]; /* sign */
							if (flag[FLAG_PLUS]=='0') {	/* base 16 case */
								flag[FLAG_PLUS] = *p++;	/* get the x|X */
							} else {
								flag[FLAG_PLUS] = '\0';
							}
							--len;
						} else if (preci) {
							ch = '0';
							--preci;
						} else {
							ch = *p++; /* main field */
							--len;
						}

						if (++cnt < max_size) {
							putc(ch, op);
						}
						if ((ch == '\n') && (buffer_mode == _IOLBF)) {
							fflush(op);
						}
					}
				}
				goto nextfmt;
			}

			fmt = fmt0;	/* this was an illegal format */
		}

		charout:
		if (++cnt < max_size) {
			putc(*fmt, op);	/* normal char out */
		}
		if ((*fmt == '\n') && (buffer_mode == _IOLBF)) {
			fflush(op);
		}

	nextfmt:
		++fmt;
	}

	op->mode |= buffer_mode;
	if (buffer_mode == _IOLBF) {
		op->bufwrite = op->bufpos;
	}

	if (ferror(op)) {
		cnt = -1;
	}
	return (cnt);
}

#endif