2
* Copyright (c) 1990, 1993
3
* The Regents of the University of California. All rights reserved.
5
* This code is derived from software contributed to Berkeley by
8
* Redistribution and use in source and binary forms, with or without
9
* modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
17
* may be used to endorse or promote products derived from this software
18
* without specific prior written permission.
20
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36
* From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
37
* paragraph 3 above is now null and void.
41
* fjc 7-31-97 Modified by Mib Software to be a standalone snprintf.c module.
42
* http://www.mibsoftware.com
43
* Mib Software does not warrant this software any differently than the
44
* University of California, Berkeley as described above. All warranties
45
* are disclaimed. Use this software at your own risk.
47
* All code referencing FILE * functions was eliminated, since it could
48
* never be called. All header files and necessary files are collapsed
49
* into one file, internal functions are declared static. This should
50
* allow inclusion into libraries with less chance of namespace collisions.
52
* snprintf should be the only externally visible item.
54
* As of 7-31-97 FLOATING_POINT is NOT provided. The code is somewhat
55
* non-portable, so it is disabled.
58
/* Define FLOATING_POINT to get floating point. */
60
#define FLOATING_POINT
63
#include <sys/types.h>
64
#define u_long unsigned long
65
#define u_short unsigned short
66
#define u_int unsigned int
68
#if !defined(HAVE_STDARG_PROTOTYPES)
70
#define HAVE_STDARG_PROTOTYPES 1
75
#if defined(HAVE_STDARG_PROTOTYPES)
88
#define _BSD_VA_LIST_ va_list
98
/* assuming 32bit(2's compliment) long */
99
# define LONG_MAX 2147483647
104
#if defined(__hpux) && !defined(__GNUC__) && !defined(__STDC__)
111
#endif /* People who don't like const sys_error */
114
#if defined(__hpux) && !defined(__GNUC__) || defined(__DECC)
118
#if !defined(__CYGWIN32__) && defined(__hpux) && !defined(__GNUC__)
126
#if SIZEOF_LONG > SIZEOF_INT
131
* NB: to fit things in six character monocase externals, the stdio
132
* code uses the prefix `__s' for stdio objects, typically followed
133
* by a three-character attempt at a mnemonic.
138
unsigned char *_base;
144
* stdio state variables.
146
* The following always hold:
148
* if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
149
* _lbfsize is -_bf._size, else _lbfsize is 0
150
* if _flags&__SRD, _w is 0
151
* if _flags&__SWR, _r is 0
153
* This ensures that the getc and putc macros (or inline functions) never
154
* try to write or read from a file that is in `read' or `write' mode.
155
* (Moreover, they can, and do, automatically switch from read mode to
156
* write mode, and back, on "r+" and "w+" files.)
158
* _lbfsize is used only to make the inline line-buffered output stream
159
* code as compact as possible.
161
* _ub, _up, and _ur are used when ungetc() pushes back more characters
162
* than fit in the current _bf, or when ungetc() pushes back a character
163
* that does not match the previous one in _bf. When this happens,
164
* _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
165
* _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
167
* NB: see WARNING above before changing the layout of this structure!
169
typedef struct __sFILE {
170
unsigned char *_p; /* current position in (some) buffer */
172
size_t _r; /* read space left for getc() */
174
size_t _w; /* write space left for putc() */
175
short _flags; /* flags, below; this FILE is free if 0 */
176
short _file; /* fileno, if Unix descriptor, else -1 */
177
struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
178
size_t _lbfsize; /* 0 or -_bf._size, for inline putc */
179
int (*vwrite)(/* struct __sFILE*, struct __suio * */);
183
#define __SLBF 0x0001 /* line buffered */
184
#define __SNBF 0x0002 /* unbuffered */
185
#define __SRD 0x0004 /* OK to read */
186
#define __SWR 0x0008 /* OK to write */
187
/* RD and WR are never simultaneously asserted */
188
#define __SRW 0x0010 /* open for reading & writing */
189
#define __SEOF 0x0020 /* found EOF */
190
#define __SERR 0x0040 /* found error */
191
#define __SMBF 0x0080 /* _buf is from malloc */
192
#define __SAPP 0x0100 /* fdopen()ed in append mode */
193
#define __SSTR 0x0200 /* this is an sprintf/snprintf string */
194
#define __SOPT 0x0400 /* do fseek() optimisation */
195
#define __SNPT 0x0800 /* do not do fseek() optimisation */
196
#define __SOFF 0x1000 /* set iff _offset is in fact correct */
197
#define __SMOD 0x2000 /* true => fgetln modified _p text */
203
#define __sfeof(p) (((p)->_flags & __SEOF) != 0)
204
#define __sferror(p) (((p)->_flags & __SERR) != 0)
205
#define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
206
#define __sfileno(p) ((p)->_file)
211
#define feof(p) __sfeof(p)
212
#define ferror(p) __sferror(p)
213
#define clearerr(p) __sclearerr(p)
216
#define fileno(p) __sfileno(p)
221
* I/O descriptors for __sfvwrite().
224
const void *iov_base;
228
struct __siov *uio_iov;
234
* Write some memory regions. Return zero on success, EOF on error.
236
* This routine is large and unsightly, but most of the ugliness due
237
* to the three different kinds of output buffering is handled here.
239
static int BSD__sfvwrite(fp, uio)
241
register struct __suio *uio;
244
register const char *p;
245
register struct __siov *iov;
248
if ((len = uio->uio_resid) == 0)
251
#define MIN(a, b) ((a) < (b) ? (a) : (b))
253
#define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n))
259
#define GETIOV(extra_work) \
263
len = iov->iov_len; \
266
if (fp->_flags & __SNBF) {
267
/* fjc 7-31-97 Will never happen. We are working with
270
} else if ((fp->_flags & __SLBF) == 0) {
272
* Fully buffered: fill partially full buffer, if any,
273
* and then flush. If there is no partial buffer, write
274
* one _bf._size byte chunk directly (without copying).
276
* String output is a special case: write as many bytes
277
* as fit, but pretend we wrote everything. This makes
278
* snprintf() return the number of bytes needed, rather
279
* than the number used, and avoids its write function
280
* (so that the write function can be invalid).
285
if (fp->_flags & __SSTR) {
288
COPY(w); /* copy MIN(fp->_w,len), */
291
w = len; /* but pretend copied all */
293
/* fjc 7-31-97 Will never happen. We are working with
299
} while ((uio->uio_resid -= w) != 0);
301
/* fjc 7-31-97 Will never happen. We are working with
309
* Actual printf innards.
311
* This code is large and complicated...
315
* Flush out all the vectors defined by the given uio,
316
* then reset it so that it can be reused.
319
BSD__sprint(FILE *fp, register struct __suio *uio)
323
if (uio->uio_resid == 0) {
327
err = (*fp->vwrite)(fp, uio);
335
* Helper function for `fprintf to unbuffered unix file': creates a
336
* temporary buffer. We only work on write-only files; this avoids
337
* worries about ungetc buffers and so forth.
340
BSD__sbprintf(register FILE *fp, const char *fmt, va_list ap)
342
/* We don't support files. */
348
* Macros for converting digits to letters and vice versa
350
#define to_digit(c) ((c) - '0')
351
#define is_digit(c) ((unsigned)to_digit(c) <= 9)
352
#define to_char(n) (char)((n) + '0')
354
#ifdef _HAVE_SANE_QUAD_
356
* Convert an unsigned long long to ASCII for printf purposes, returning
357
* a pointer to the first character of the string representation.
358
* Octal numbers can be forced to have a leading zero; hex numbers
359
* use the given digits.
362
BSD__uqtoa(register u_quad_t val, char *endp, int base, int octzero, const char *xdigs)
364
register char *cp = endp;
368
* Handle the three cases separately, in the hope of getting
369
* better/faster code.
373
if (val < 10) { /* many numbers are 1 digit */
374
*--cp = to_char(val);
378
* On many machines, unsigned arithmetic is harder than
379
* signed arithmetic, so we do at most one unsigned mod and
380
* divide; this is sufficient to reduce the range of
381
* the incoming value to where signed arithmetic works.
383
if (val > LLONG_MAX) {
384
*--cp = to_char(val % 10);
389
*--cp = to_char(sval % 10);
396
*--cp = to_char(val & 7);
399
if (octzero && *cp != '0')
405
*--cp = xdigs[val & 15];
414
break; /* fjc 7-31-97. Don't reference abort() here */
418
#endif /* _HAVE_SANE_QUAD_ */
421
* Convert an unsigned long to ASCII for printf purposes, returning
422
* a pointer to the first character of the string representation.
423
* Octal numbers can be forced to have a leading zero; hex numbers
424
* use the given digits.
427
BSD__ultoa(register u_long val, char *endp, int base, int octzero, const char *xdigs)
429
register char *cp = endp;
433
* Handle the three cases separately, in the hope of getting
434
* better/faster code.
438
if (val < 10) { /* many numbers are 1 digit */
439
*--cp = to_char(val);
443
* On many machines, unsigned arithmetic is harder than
444
* signed arithmetic, so we do at most one unsigned mod and
445
* divide; this is sufficient to reduce the range of
446
* the incoming value to where signed arithmetic works.
448
if (val > LONG_MAX) {
449
*--cp = to_char(val % 10);
454
*--cp = to_char(sval % 10);
461
*--cp = to_char(val & 7);
464
if (octzero && *cp != '0')
470
*--cp = xdigs[val & 15];
479
break; /* fjc 7-31-97. Don't reference abort() here */
484
#ifdef FLOATING_POINT
486
/* #include "floatio.h" */
496
#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
499
static char *cvt __P((double, int, int, char *, int *, int, int *, char *));
500
static int exponent __P((char *, int, int));
502
#else /* no FLOATING_POINT */
506
#endif /* FLOATING_POINT */
510
* Flags used during conversion.
512
#define ALT 0x001 /* alternate form */
513
#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
514
#define LADJUST 0x004 /* left adjustment */
515
#define LONGDBL 0x008 /* long double; unimplemented */
516
#define LONGINT 0x010 /* long integer */
518
#ifdef _HAVE_SANE_QUAD_
519
#define QUADINT 0x020 /* quad integer */
520
#endif /* _HAVE_SANE_QUAD_ */
522
#define SHORTINT 0x040 /* short integer */
523
#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
524
#define FPT 0x100 /* Floating point number */
526
BSD_vfprintf(FILE *fp, const char *fmt0, va_list ap)
528
register const char *fmt; /* format string */
529
register int ch; /* character from fmt */
530
register int n; /* handy integer (short term usage) */
531
register const char *cp;/* handy char pointer (short term usage) */
532
register struct __siov *iovp;/* for PRINT macro */
533
register int flags; /* flags as above */
534
ssize_t ret; /* return value accumulator */
535
int width; /* width from format (%8d), or 0 */
536
int prec; /* precision from format (%.3d), or -1 */
537
char sign; /* sign prefix (' ', '+', '-', or \0) */
538
#ifdef FLOATING_POINT
539
char softsign; /* temporary negative sign for floats */
540
double _double = 0; /* double precision arguments %[eEfgG] */
541
int expt; /* integer value of exponent */
542
int expsize = 0; /* character count for expstr */
543
int ndig = 0; /* actual number of digits returned by cvt */
544
char expstr[7]; /* buffer for exponent string */
546
u_long ulval; /* integer arguments %[diouxX] */
547
#ifdef _HAVE_SANE_QUAD_
548
u_quad_t uqval; /* %q integers */
549
#endif /* _HAVE_SANE_QUAD_ */
550
int base; /* base for [diouxX] conversion */
551
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
552
long fieldsz; /* field size expanded by sign, etc */
553
long realsz; /* field size expanded by dprec */
554
int size; /* size of converted field or string */
555
const char *xdigs = 0; /* digits for [xX] conversion */
557
struct __suio uio; /* output information: summary */
558
struct __siov iov[NIOV];/* ... and individual io vectors */
559
char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
560
char ox[4]; /* space for 0x hex-prefix, hexadecimal's 1. */
561
char *const ebuf = buf + sizeof(buf);
562
#if SIZEOF_LONG > SIZEOF_INT
567
* Choose PADSIZE to trade efficiency vs. size. If larger printf
568
* fields occur frequently, increase PADSIZE and make the initializers
571
#define PADSIZE 16 /* pad chunk size */
572
static const char blanks[PADSIZE] =
573
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
574
static const char zeroes[PADSIZE] =
575
{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
578
* BEWARE, these `goto error' on error, and PAD uses `n'.
580
#define PRINT(ptr, len) { \
581
iovp->iov_base = (ptr); \
582
iovp->iov_len = (len); \
583
uio.uio_resid += (len); \
585
if (++uio.uio_iovcnt >= NIOV) { \
586
if (BSD__sprint(fp, &uio)) \
591
#define PAD(howmany, with) { \
592
if ((n = (howmany)) > 0) { \
593
while (n > PADSIZE) { \
594
PRINT(with, PADSIZE); \
600
#if SIZEOF_LONG > SIZEOF_INT
601
/* abandon if too larger padding */
602
#define PAD_L(howmany, with) { \
604
if ((long)((int)ln) != ln) { \
608
if (ln > 0) PAD((int)ln, with); \
611
#define PAD_L(howmany, with) PAD(howmany, with)
614
if (uio.uio_resid && BSD__sprint(fp, &uio)) \
616
uio.uio_iovcnt = 0; \
621
* To extend shorts properly, we need both signed and unsigned
622
* argument extraction methods.
625
(flags&LONGINT ? va_arg(ap, long) : \
626
flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
627
(long)va_arg(ap, int))
629
(flags&LONGINT ? va_arg(ap, u_long) : \
630
flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
631
(u_long)va_arg(ap, u_int))
633
/* optimise fprintf(stderr) (and other unbuffered Unix files) */
634
if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
636
return (BSD__sbprintf(fp, fmt0, ap));
639
uio.uio_iov = iovp = iov;
646
* Scan the format for conversions (`%' character).
650
for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
652
if ((nc = fmt - cp) != 0) {
658
fmt++; /* skip over '%' */
667
reswitch: switch (ch) {
670
* ``If the space and + flags both appear, the space
671
* flag will be ignored.''
682
* ``A negative field width argument is taken as a
683
* - flag followed by a positive field width.''
685
* They don't exclude field widths read from args.
687
if ((width = va_arg(ap, int)) >= 0)
698
if ((ch = *fmt++) == '*') {
700
prec = n < 0 ? -1 : n;
704
while (is_digit(ch)) {
705
n = 10 * n + to_digit(ch);
708
prec = n < 0 ? -1 : n;
712
* ``Note that 0 is taken as a flag, not as the
713
* beginning of a field width.''
718
case '1': case '2': case '3': case '4':
719
case '5': case '6': case '7': case '8': case '9':
722
n = 10 * n + to_digit(ch);
724
} while (is_digit(ch));
727
#ifdef FLOATING_POINT
735
#if SIZEOF_PTRDIFF_T == SIZEOF_LONG
738
#if SIZEOF_SIZE_T == SIZEOF_LONG
744
#ifdef _HAVE_SANE_QUAD_
745
#if SIZEOF_PTRDIFF_T == SIZEOF_LONG_LONG
748
#if SIZEOF_SIZE_T == SIZEOF_LONG_LONG
754
#endif /* _HAVE_SANE_QUAD_ */
757
*buf = (char)va_arg(ap, int);
766
#ifdef _HAVE_SANE_QUAD_
767
if (flags & QUADINT) {
768
uqval = va_arg(ap, quad_t);
769
if ((quad_t)uqval < 0) {
770
uqval = -(quad_t)uqval;
774
#endif /* _HAVE_SANE_QUAD_ */
777
if ((long)ulval < 0) {
778
ulval = (u_long)(-(long)ulval);
784
#ifdef FLOATING_POINT
790
case 'e': /* anomalous precision */
794
prec = (prec == -1) ?
795
DEFPREC + 1 : prec + 1;
798
case 'f': /* always print trailing zeroes */
805
fp_begin: _double = va_arg(ap, double);
806
/* do this before tricky precision changes */
807
if (isinf(_double)) {
814
if (isnan(_double)) {
820
cp = cvt(_double, prec, flags, &softsign,
821
&expt, ch, &ndig, buf);
822
if (ch == 'g' || ch == 'G') {
823
if (expt <= -4 || (expt > prec && expt > 1))
824
ch = (ch == 'g') ? 'e' : 'E';
828
if (ch == 'a' || ch == 'A') {
830
expsize = exponent(expstr, expt, ch + 'p' - 'a');
831
size = expsize + ndig;
833
else if (ch <= 'e') { /* 'e' or 'E' fmt */
835
expsize = exponent(expstr, expt, ch);
836
size = expsize + ndig;
837
if (ndig > 1 || flags & ALT)
839
} else if (ch == 'f') { /* f fmt */
842
if (prec || flags & ALT)
844
} else if (!prec) { /* "0" */
848
} else if (expt >= ndig) { /* fixed g fmt */
853
size = ndig + (expt > 0 ?
859
#endif /* FLOATING_POINT */
861
#ifdef _HAVE_SANE_QUAD_
863
*va_arg(ap, quad_t *) = ret;
864
else if (flags & LONGINT)
865
#else /* _HAVE_SANE_QUAD_ */
867
#endif /* _HAVE_SANE_QUAD_ */
868
*va_arg(ap, long *) = ret;
869
else if (flags & SHORTINT)
870
*va_arg(ap, short *) = (short)ret;
872
*va_arg(ap, int *) = (int)ret;
873
continue; /* no output */
878
#ifdef _HAVE_SANE_QUAD_
880
uqval = va_arg(ap, u_quad_t);
882
#endif /* _HAVE_SANE_QUAD_ */
888
* ``The argument shall be a pointer to void. The
889
* value of the pointer is converted to a sequence
890
* of printable characters, in an implementation-
894
prec = (int)(sizeof(void*)*CHAR_BIT/4);
896
uqval = (u_long)va_arg(ap, void *);
897
flags = (flags) | QUADINT | HEXPREFIX;
899
ulval = (u_long)va_arg(ap, void *);
900
#ifdef _HAVE_SANE_QUAD_
901
flags = (flags & ~QUADINT) | HEXPREFIX;
902
#else /* _HAVE_SANE_QUAD_ */
903
flags = (flags) | HEXPREFIX;
904
#endif /* _HAVE_SANE_QUAD_ */
907
xdigs = "0123456789abcdef";
911
if ((cp = va_arg(ap, char *)) == NULL)
915
* can't use strlen; can only look for the
916
* NUL in the first `prec' characters, and
917
* strlen() will go further.
919
const char *p = (char *)memchr(cp, 0, prec);
921
if (p != NULL && (p - cp) > prec)
922
size = (int)(p - cp);
927
fieldsz = strlen(cp);
936
#ifdef _HAVE_SANE_QUAD_
938
uqval = va_arg(ap, u_quad_t);
940
#endif /* _HAVE_SANE_QUAD_ */
945
xdigs = "0123456789ABCDEF";
948
xdigs = "0123456789abcdef";
950
#ifdef _HAVE_SANE_QUAD_
952
uqval = va_arg(ap, u_quad_t);
954
#endif /* _HAVE_SANE_QUAD_ */
957
/* leading 0x/X only if non-zero */
959
#ifdef _HAVE_SANE_QUAD_
960
(flags & QUADINT ? uqval != 0 : ulval != 0)
961
#else /* _HAVE_SANE_QUAD_ */
963
#endif /* _HAVE_SANE_QUAD_ */
967
/* unsigned conversions */
970
* ``... diouXx conversions ... if a precision is
971
* specified, the 0 flag will be ignored.''
974
number: if ((dprec = prec) >= 0)
978
* ``The result of converting a zero value with an
979
* explicit precision of zero is no characters.''
982
#ifdef _HAVE_SANE_QUAD_
983
if (flags & QUADINT) {
984
if (uqval != 0 || prec != 0)
985
cp = BSD__uqtoa(uqval, ebuf, base,
988
#else /* _HAVE_SANE_QUAD_ */
989
#endif /* _HAVE_SANE_QUAD_ */
991
if (ulval != 0 || prec != 0)
992
cp = BSD__ultoa(ulval, ebuf, base,
995
size = (int)(ebuf - cp);
997
default: /* "%?" prints ?, unless ? is NUL */
1000
/* pretend it was %c with argument ch */
1009
* All reasonable formats wind up here. At this point, `cp'
1010
* points to a string which (if not flags&LADJUST) should be
1011
* padded out to `width' places. If flags&ZEROPAD, it should
1012
* first be prefixed by any sign or other prefix; otherwise,
1013
* it should be blank padded before the prefix is emitted.
1014
* After any left-hand padding and prefixing, emit zeroes
1015
* required by a decimal [diouxX] precision, then print the
1016
* string proper, then emit zeroes required by any leftover
1017
* floating precision; finally, if LADJUST, pad with blanks.
1019
* Compute actual size, so we know how much to pad.
1020
* fieldsz excludes decimal prec; realsz includes it.
1026
else if (flags & HEXPREFIX)
1028
realsz = dprec > fieldsz ? dprec : fieldsz;
1030
/* right-adjusting blank padding */
1031
if ((flags & (LADJUST|ZEROPAD)) == 0)
1032
PAD_L(width - realsz, blanks);
1037
} else if (flags & HEXPREFIX) {
1043
/* right-adjusting zero padding */
1044
if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
1045
PAD_L(width - realsz, zeroes);
1047
/* leading zeroes from decimal precision */
1048
PAD_L(dprec - fieldsz, zeroes);
1051
else if (flags & HEXPREFIX)
1054
/* the string or number proper */
1055
#ifdef FLOATING_POINT
1056
if ((flags & FPT) == 0) {
1058
} else { /* glue together f_p fragments */
1059
if (ch == 'a' || ch == 'A') {
1061
ox[1] = ch + ('x' - 'a');
1063
if (ndig > 1 || flags & ALT) {
1070
PRINT(expstr, expsize);
1072
else if (ch >= 'f') { /* 'f' or 'g' */
1074
/* kludge for __dtoa irregularity */
1076
(flags & ALT) == 0) {
1080
PAD(ndig - 1, zeroes);
1082
} else if (expt == 0 && ndig == 0 && (flags & ALT) == 0) {
1084
} else if (expt <= 0) {
1088
} else if (expt >= ndig) {
1090
PAD(expt - ndig, zeroes);
1097
PRINT(cp, ndig-expt);
1099
} else { /* 'e' or 'E' */
1100
if (ndig > 1 || flags & ALT) {
1104
if (_double /*|| flags & ALT == 0*/) {
1106
} else /* 0.[0..] */
1107
/* __dtoa irregularity */
1108
PAD(ndig - 1, zeroes);
1111
PRINT(expstr, expsize);
1117
/* left-adjusting padding (always blank) */
1118
if (flags & LADJUST)
1119
PAD_L(width - realsz, blanks);
1121
/* finally, adjust ret */
1122
ret += width > realsz ? width : realsz;
1124
FLUSH(); /* copy out the I/O vectors */
1129
return (__sferror(fp) ? EOF : ret);
1133
#ifdef FLOATING_POINT
1135
extern char *BSD__dtoa __P((double, int, int, int *, int *, char **));
1136
extern char *BSD__hdtoa(double, const char *, int, int *, int *, char **);
1139
cvt(value, ndigits, flags, sign, decpt, ch, length, buf)
1141
int ndigits, flags, *decpt, ch, *length;
1145
char *digits, *bp, *rve;
1155
} else if (value == 0.0 && 1.0/value < 0) {
1160
if (ch == 'a' || ch =='A') {
1161
digits = BSD__hdtoa(value,
1162
ch == 'a' ? "0123456789abcdef" : "0123456789ABCDEF",
1163
ndigits, decpt, &dsgn, &rve);
1166
digits = BSD__dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
1168
memcpy(buf, digits, rve - digits);
1170
rve = buf + (rve - digits);
1172
if (flags & ALT) { /* Print trailing zeros */
1173
bp = digits + ndigits;
1175
if (*digits == '0' && value)
1176
*decpt = -ndigits + 1;
1179
if (value == 0) /* kludge for __dtoa irregularity */
1184
*length = (int)(rve - digits);
1189
exponent(p0, exp, fmtch)
1193
register char *p, *t;
1194
char expbuf[MAXEXP];
1204
t = expbuf + MAXEXP;
1207
*--t = to_char(exp % 10);
1208
} while ((exp /= 10) > 9);
1209
*--t = to_char(exp);
1210
for (; t < expbuf + MAXEXP; *p++ = *t++);
1213
if (fmtch & 15) *p++ = '0'; /* other than p or P */
1214
*p++ = to_char(exp);
1216
return (int)(p - p0);
1218
#endif /* FLOATING_POINT */
1221
ruby_vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
1228
f._flags = __SWR | __SSTR;
1229
f._bf._base = f._p = (unsigned char *)str;
1230
f._bf._size = f._w = n - 1;
1231
f.vwrite = BSD__sfvwrite;
1232
ret = (int)BSD_vfprintf(&f, fmt, ap);
1238
ruby_snprintf(char *str, size_t n, char const *fmt, ...)
1248
f._flags = __SWR | __SSTR;
1249
f._bf._base = f._p = (unsigned char *)str;
1250
f._bf._size = f._w = n - 1;
1251
f.vwrite = BSD__sfvwrite;
1252
ret = (int)BSD_vfprintf(&f, fmt, ap);
added
removed
vsnprintf.c
