Ruby  3.4.0dev (2024-12-06 revision 892c46283a5ea4179500d951c9d4866c0051f27b)
vsnprintf.c (892c46283a5ea4179500d951c9d4866c0051f27b)
1 /*-
2  * Copyright (c) 1990, 1993
3  * The Regents of the University of California. 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. 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.
19  *
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
30  * SUCH DAMAGE.
31  */
32 
33 /*
34  * IMPORTANT NOTE:
35  * --------------
36  * From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
37  * paragraph 3 above is now null and void.
38  */
39 
40 /* SNPRINTF.C
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.
46  *
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.
51  *
52  * snprintf should be the only externally visible item.
53  *
54  * As of 7-31-97 FLOATING_POINT is NOT provided. The code is somewhat
55  * non-portable, so it is disabled.
56  */
57 
58 /* Define FLOATING_POINT to get floating point. */
59 /*
60 #define FLOATING_POINT
61 */
62 
63 #include <sys/types.h>
64 #define u_long unsigned long
65 #define u_short unsigned short
66 #define u_int unsigned int
67 
68 #if !defined(HAVE_STDARG_PROTOTYPES)
69 #if defined(__STDC__)
70 #define HAVE_STDARG_PROTOTYPES 1
71 #endif
72 #endif
73 
74 #undef __P
75 #if defined(HAVE_STDARG_PROTOTYPES)
76 # include <stdarg.h>
77 # if !defined(__P)
78 # define __P(x) x
79 # endif
80 #else
81 # define __P(x) ()
82 # if !defined(const)
83 # define const
84 # endif
85 # include <varargs.h>
86 #endif
87 #ifndef _BSD_VA_LIST_
88 #define _BSD_VA_LIST_ va_list
89 #endif
90 
91 #ifdef __STDC__
92 # include <limits.h>
93 #else
94 # ifndef LONG_MAX
95 # ifdef HAVE_LIMITS_H
96 # include <limits.h>
97 # else
98  /* assuming 32bit(2's complement) long */
99 # define LONG_MAX 2147483647
100 # endif
101 # endif
102 #endif
103 
104 #if defined(sgi)
105 #undef __const
106 #define __const
107 #endif /* People who don't like const sys_error */
108 
109 #include <stddef.h>
110 
111 #ifndef NULL
112 #define NULL 0
113 #endif
114 
115 #if SIZEOF_LONG > SIZEOF_INT
116 # include <errno.h>
117 #endif
118 
119 /*
120  * NB: to fit things in six character monocase externals, the stdio
121  * code uses the prefix `__s' for stdio objects, typically followed
122  * by a three-character attempt at a mnemonic.
123  */
124 
125 /* stdio buffers */
126 struct __sbuf {
127  unsigned char *_base;
128  size_t _size;
129 };
130 
131 
132 /*
133  * stdio state variables.
134  *
135  * The following always hold:
136  *
137  * if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
138  * _lbfsize is -_bf._size, else _lbfsize is 0
139  * if _flags&__SRD, _w is 0
140  * if _flags&__SWR, _r is 0
141  *
142  * This ensures that the getc and putc macros (or inline functions) never
143  * try to write or read from a file that is in `read' or `write' mode.
144  * (Moreover, they can, and do, automatically switch from read mode to
145  * write mode, and back, on "r+" and "w+" files.)
146  *
147  * _lbfsize is used only to make the inline line-buffered output stream
148  * code as compact as possible.
149  *
150  * _ub, _up, and _ur are used when ungetc() pushes back more characters
151  * than fit in the current _bf, or when ungetc() pushes back a character
152  * that does not match the previous one in _bf. When this happens,
153  * _ub._base becomes non-nil (i.e., a stream has ungetc() data if and only if
154  * _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
155  *
156  * NB: see WARNING above before changing the layout of this structure!
157  */
158 struct __suio;
159 
160 typedef struct __sFILE {
161  unsigned char *_p; /* current position in (some) buffer */
162 #if 0
163  size_t _r; /* read space left for getc() */
164 #endif
165  size_t _w; /* write space left for putc() */
166  short _flags; /* flags, below; this FILE is free if 0 */
167  short _file; /* fileno, if Unix descriptor, else -1 */
168  struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
169 #if 0
170  size_t _lbfsize; /* 0 or -_bf._size, for inline putc */
171 #endif
172  int (*vwrite)(struct __sFILE*, struct __suio *);
173  const char *(*vextra)(struct __sFILE*, size_t, void*, long*, int);
174 } FILE;
175 
176 
177 #define __SLBF 0x0001 /* line buffered */
178 #define __SNBF 0x0002 /* unbuffered */
179 #define __SRD 0x0004 /* OK to read */
180 #define __SWR 0x0008 /* OK to write */
181  /* RD and WR are never simultaneously asserted */
182 #define __SRW 0x0010 /* open for reading & writing */
183 #define __SEOF 0x0020 /* found EOF */
184 #define __SERR 0x0040 /* found error */
185 #define __SMBF 0x0080 /* _buf is from malloc */
186 #define __SAPP 0x0100 /* fdopen()ed in append mode */
187 #define __SSTR 0x0200 /* this is an sprintf/snprintf string */
188 #define __SOPT 0x0400 /* do fseek() optimisation */
189 #define __SNPT 0x0800 /* do not do fseek() optimisation */
190 #define __SOFF 0x1000 /* set if and only if _offset is in fact correct */
191 #define __SMOD 0x2000 /* true => fgetln modified _p text */
192 
193 
194 #define EOF (-1)
195 
196 
197 #define BSD__sfeof(p) (((p)->_flags & __SEOF) != 0)
198 #define BSD__sferror(p) (((p)->_flags & __SERR) != 0)
199 #define BSD__sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
200 #define BSD__sfileno(p) ((p)->_file)
201 
202 #undef feof
203 #undef ferror
204 #undef clearerr
205 #define feof(p) BSD__sfeof(p)
206 #define ferror(p) BSD__sferror(p)
207 #define clearerr(p) BSD__sclearerr(p)
208 
209 #ifndef _ANSI_SOURCE
210 #define fileno(p) BSD__sfileno(p)
211 #endif
212 
213 
214 /*
215  * I/O descriptors for __sfvwrite().
216  */
217 struct __siov {
218  const void *iov_base;
219  size_t iov_len;
220 };
221 struct __suio {
222  struct __siov *uio_iov;
223  int uio_iovcnt;
224  size_t uio_resid;
225 };
226 
227 /*
228  * Write some memory regions. Return zero on success, EOF on error.
229  *
230  * This routine is large and unsightly, but most of the ugliness due
231  * to the three different kinds of output buffering is handled here.
232  */
233 static int
234 BSD__sfvwrite(register FILE *fp, register struct __suio *uio)
235 {
236  register size_t len;
237  register const char *p;
238  register struct __siov *iov;
239  register size_t w;
240 
241  if ((len = uio->uio_resid) == 0)
242  return (0);
243 #define MIN(a, b) ((a) < (b) ? (a) : (b))
244 #define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n))
245 
246  iov = uio->uio_iov;
247  p = iov->iov_base;
248  len = iov->iov_len;
249  iov++;
250 #define GETIOV(extra_work) \
251  while (len == 0) { \
252  extra_work; \
253  p = iov->iov_base; \
254  len = iov->iov_len; \
255  iov++; \
256  }
257  if (fp->_flags & __SNBF) {
258  /* fjc 7-31-97 Will never happen. We are working with
259  strings only
260  */
261  } else if ((fp->_flags & __SLBF) == 0) {
262  /*
263  * Fully buffered: fill partially full buffer, if any,
264  * and then flush. If there is no partial buffer, write
265  * one _bf._size byte chunk directly (without copying).
266  *
267  * String output is a special case: write as many bytes
268  * as fit, but pretend we wrote everything. This makes
269  * snprintf() return the number of bytes needed, rather
270  * than the number used, and avoids its write function
271  * (so that the write function can be invalid).
272  */
273  do {
274  GETIOV(;);
275  w = fp->_w;
276  if (fp->_flags & __SSTR) {
277  if (len < w)
278  w = len;
279  COPY(w); /* copy MIN(fp->_w,len), */
280  fp->_w -= w;
281  fp->_p += w;
282  w = len; /* but pretend copied all */
283  } else {
284  /* fjc 7-31-97 Will never happen. We are working with
285  strings only
286  */
287  }
288  p += w;
289  len -= w;
290  } while ((uio->uio_resid -= w) != 0);
291  } else {
292  /* fjc 7-31-97 Will never happen. We are working with
293  strings only
294  */
295  }
296  return (0);
297 }
298 
299 /*
300  * Actual printf innards.
301  *
302  * This code is large and complicated...
303  */
304 
305 /*
306  * Flush out all the vectors defined by the given uio,
307  * then reset it so that it can be reused.
308  */
309 static int
310 BSD__sprint(FILE *fp, register struct __suio *uio)
311 {
312  register int err;
313 
314  if (uio->uio_resid == 0) {
315  uio->uio_iovcnt = 0;
316  return (0);
317  }
318  err = (*fp->vwrite)(fp, uio);
319  uio->uio_resid = 0;
320  uio->uio_iovcnt = 0;
321  return (err);
322 }
323 
324 
325 /*
326  * Helper function for `fprintf to unbuffered unix file': creates a
327  * temporary buffer. We only work on write-only files; this avoids
328  * worries about ungetc buffers and so forth.
329  */
330 static int
331 BSD__sbprintf(register FILE *fp, const char *fmt, va_list ap)
332 {
333 /* We don't support files. */
334  return 0;
335 }
336 
337 
338 /*
339  * Macros for converting digits to letters and vice versa
340  */
341 #define to_digit(c) ((c) - '0')
342 #define is_digit(c) ((unsigned)to_digit(c) <= 9)
343 #define to_char(n) (char)((n) + '0')
344 
345 #ifdef _HAVE_SANE_QUAD_
346 /*
347  * Convert an unsigned long long to ASCII for printf purposes, returning
348  * a pointer to the first character of the string representation.
349  * Octal numbers can be forced to have a leading zero; hex numbers
350  * use the given digits.
351  */
352 static char *
353 BSD__uqtoa(register u_quad_t val, char *endp, int base, int octzero, const char *xdigs)
354 {
355  register char *cp = endp;
356  register quad_t sval;
357 
358  /*
359  * Handle the three cases separately, in the hope of getting
360  * better/faster code.
361  */
362  switch (base) {
363  case 10:
364  if (val < 10) { /* many numbers are 1 digit */
365  *--cp = to_char(val);
366  return (cp);
367  }
368  /*
369  * On many machines, unsigned arithmetic is harder than
370  * signed arithmetic, so we do at most one unsigned mod and
371  * divide; this is sufficient to reduce the range of
372  * the incoming value to where signed arithmetic works.
373  */
374  if (val > LLONG_MAX) {
375  *--cp = to_char(val % 10);
376  sval = val / 10;
377  } else
378  sval = val;
379  do {
380  *--cp = to_char(sval % 10);
381  sval /= 10;
382  } while (sval != 0);
383  break;
384 
385  case 8:
386  do {
387  *--cp = to_char(val & 7);
388  val >>= 3;
389  } while (val);
390  if (octzero && *cp != '0')
391  *--cp = '0';
392  break;
393 
394  case 16:
395  do {
396  *--cp = xdigs[val & 15];
397  val >>= 4;
398  } while (val);
399  break;
400 
401  default: /* oops */
402  /*
403  abort();
404  */
405  break; /* fjc 7-31-97. Don't reference abort() here */
406  }
407  return (cp);
408 }
409 #endif /* _HAVE_SANE_QUAD_ */
410 
411 /*
412  * Convert an unsigned long to ASCII for printf purposes, returning
413  * a pointer to the first character of the string representation.
414  * Octal numbers can be forced to have a leading zero; hex numbers
415  * use the given digits.
416  */
417 static char *
418 BSD__ultoa(register u_long val, char *endp, int base, int octzero, const char *xdigs)
419 {
420  register char *cp = endp;
421  register long sval;
422 
423  /*
424  * Handle the three cases separately, in the hope of getting
425  * better/faster code.
426  */
427  switch (base) {
428  case 10:
429  if (val < 10) { /* many numbers are 1 digit */
430  *--cp = to_char(val);
431  return (cp);
432  }
433  /*
434  * On many machines, unsigned arithmetic is harder than
435  * signed arithmetic, so we do at most one unsigned mod and
436  * divide; this is sufficient to reduce the range of
437  * the incoming value to where signed arithmetic works.
438  */
439  if (val > LONG_MAX) {
440  *--cp = to_char(val % 10);
441  sval = val / 10;
442  } else
443  sval = val;
444  do {
445  *--cp = to_char(sval % 10);
446  sval /= 10;
447  } while (sval != 0);
448  break;
449 
450  case 8:
451  do {
452  *--cp = to_char(val & 7);
453  val >>= 3;
454  } while (val);
455  if (octzero && *cp != '0')
456  *--cp = '0';
457  break;
458 
459  case 16:
460  do {
461  *--cp = xdigs[val & 15];
462  val >>= 4;
463  } while (val);
464  break;
465 
466  default: /* oops */
467  /*
468  abort();
469  */
470  break; /* fjc 7-31-97. Don't reference abort() here */
471  }
472  return (cp);
473 }
474 
475 #ifdef FLOATING_POINT
476 #include <math.h>
477 #include <float.h>
478 /* #include "floatio.h" */
479 
480 #ifndef MAXEXP
481 # if DBL_MAX_10_EXP > -DBL_MIN_10_EXP
482 # define MAXEXP (DBL_MAX_10_EXP)
483 # else
484 # define MAXEXP (-DBL_MIN_10_EXP)
485 # endif
486 #endif
487 
488 #ifndef MAXFRACT
489 # define MAXFRACT (MAXEXP*10/3)
490 #endif
491 
492 #define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
493 #define DEFPREC 6
494 
495 static char *cvt(double, int, int, char *, int *, int, int *, char *);
496 static int exponent(char *, int, int);
497 
498 #else /* no FLOATING_POINT */
499 
500 #define BUF 68
501 
502 #endif /* FLOATING_POINT */
503 
504 #ifndef lower_hexdigits
505 # define lower_hexdigits "0123456789abcdef"
506 #endif
507 #ifndef upper_hexdigits
508 # define upper_hexdigits "0123456789ABCDEF"
509 #endif
510 
511 /*
512  * Flags used during conversion.
513  */
514 #define ALT 0x001 /* alternate form */
515 #define HEXPREFIX 0x002 /* add 0x or 0X prefix */
516 #define LADJUST 0x004 /* left adjustment */
517 #define LONGDBL 0x008 /* long double; unimplemented */
518 #define LONGINT 0x010 /* long integer */
519 
520 #ifdef _HAVE_SANE_QUAD_
521 #define QUADINT 0x020 /* quad integer */
522 #endif /* _HAVE_SANE_QUAD_ */
523 
524 #define SHORTINT 0x040 /* short integer */
525 #define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
526 #define FPT 0x100 /* Floating point number */
527 ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(static ssize_t BSD_vfprintf(FILE *fp, const char *fmt0, va_list ap));
528 static ssize_t
529 BSD_vfprintf(FILE *fp, const char *fmt0, va_list ap)
530 {
531 #ifdef PRI_EXTRA_MARK
532  const int PRI_EXTRA_MARK_LEN = rb_strlen_lit(PRI_EXTRA_MARK);
533 #endif
534  register const char *fmt; /* format string */
535  register int ch; /* character from fmt */
536  register int n; /* handy integer (short term usage) */
537  register const char *cp;/* handy char pointer (short term usage) */
538  register struct __siov *iovp;/* for PRINT macro */
539  register int flags; /* flags as above */
540  ssize_t ret; /* return value accumulator */
541  int width; /* width from format (%8d), or 0 */
542  int prec; /* precision from format (%.3d), or -1 */
543  char sign; /* sign prefix (' ', '+', '-', or \0) */
544 #ifdef FLOATING_POINT
545  char softsign; /* temporary negative sign for floats */
546  double _double = 0; /* double precision arguments %[eEfgG] */
547  int expt; /* integer value of exponent */
548  int expsize = 0; /* character count for expstr */
549  int ndig = 0; /* actual number of digits returned by cvt */
550  int fprec = 0; /* floating point precision */
551  char expstr[7]; /* buffer for exponent string */
552 #endif
553  u_long MAYBE_UNUSED(ulval) = 0; /* integer arguments %[diouxX] */
554 #ifdef _HAVE_SANE_QUAD_
555  u_quad_t MAYBE_UNUSED(uqval) = 0; /* %q integers */
556 #endif /* _HAVE_SANE_QUAD_ */
557  int base; /* base for [diouxX] conversion */
558  int dprec; /* a copy of prec if [diouxX], 0 otherwise */
559  long fieldsz; /* field size expanded by sign, etc */
560  long realsz; /* field size expanded by dprec */
561  int size; /* size of converted field or string */
562  const char *xdigs = 0; /* digits for [xX] conversion */
563 #define NIOV 8
564  struct __suio uio; /* output information: summary */
565  struct __siov iov[NIOV];/* ... and individual io vectors */
566  char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
567  char ox[4]; /* space for 0x hex-prefix, hexadecimal's 1. */
568  char *const ebuf = buf + sizeof(buf);
569 #if SIZEOF_LONG > SIZEOF_INT
570  long ln;
571 #endif
572 
573  /*
574  * Choose PADSIZE to trade efficiency vs. size. If larger printf
575  * fields occur frequently, increase PADSIZE and make the initializers
576  * below longer.
577  */
578 #define PADSIZE 16 /* pad chunk size */
579  static const char blanks[PADSIZE] =
580  {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
581  static const char zeroes[PADSIZE] =
582  {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
583 
584  /*
585  * BEWARE, these `goto error' on error, and PAD uses `n'.
586  */
587 #define PRINT(ptr, len) { \
588  iovp->iov_base = (ptr); \
589  iovp->iov_len = (len); \
590  uio.uio_resid += (len); \
591  iovp++; \
592  if (++uio.uio_iovcnt >= NIOV) { \
593  if (BSD__sprint(fp, &uio)) \
594  goto error; \
595  iovp = iov; \
596  } \
597 }
598 #define PAD(howmany, with) { \
599  if ((n = (howmany)) > 0) { \
600  while (n > PADSIZE) { \
601  PRINT((with), PADSIZE); \
602  n -= PADSIZE; \
603  } \
604  PRINT((with), n); \
605  } \
606 }
607 #if SIZEOF_LONG > SIZEOF_INT
608  /* abandon if too larger padding */
609 #define PAD_L(howmany, with) { \
610  ln = (howmany); \
611  if ((long)((int)ln) != ln) { \
612  errno = ENOMEM; \
613  goto error; \
614  } \
615  if (ln > 0) PAD((int)ln, (with)); \
616 }
617 #else
618 #define PAD_L(howmany, with) PAD((howmany), (with))
619 #endif
620 #define FLUSH() { \
621  if (uio.uio_resid && BSD__sprint(fp, &uio)) \
622  goto error; \
623  uio.uio_iovcnt = 0; \
624  iovp = iov; \
625 }
626 
627  /*
628  * To extend shorts properly, we need both signed and unsigned
629  * argument extraction methods.
630  */
631 #define SARG() \
632  (flags&LONGINT ? va_arg(ap, long) : \
633  flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
634  (long)va_arg(ap, int))
635 #define UARG() \
636  (flags&LONGINT ? va_arg(ap, u_long) : \
637  flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
638  (u_long)va_arg(ap, u_int))
639 
640  /* optimize fprintf(stderr) (and other unbuffered Unix files) */
641  if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
642  fp->_file >= 0)
643  return (BSD__sbprintf(fp, fmt0, ap));
644 
645  fmt = fmt0;
646  uio.uio_iov = iovp = iov;
647  uio.uio_resid = 0;
648  uio.uio_iovcnt = 0;
649  ret = 0;
650  xdigs = 0;
651 
652  /*
653  * Scan the format for conversions (`%' character).
654  */
655  for (;;) {
656  size_t nc;
657  for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
658  /* void */;
659  if ((nc = fmt - cp) != 0) {
660  PRINT(cp, nc);
661  ret += nc;
662  }
663  if (ch == '\0')
664  goto done;
665  fmt++; /* skip over '%' */
666 
667  flags = 0;
668  dprec = 0;
669  width = 0;
670  prec = -1;
671  sign = '\0';
672 
673 rflag: ch = *fmt++;
674 reswitch: switch (ch) {
675  case ' ':
676  /*
677  * ``If the space and + flags both appear, the space
678  * flag will be ignored.''
679  * -- ANSI X3J11
680  */
681  if (!sign)
682  sign = ' ';
683  goto rflag;
684  case '#':
685  flags |= ALT;
686  goto rflag;
687  case '*':
688  /*
689  * ``A negative field width argument is taken as a
690  * - flag followed by a positive field width.''
691  * -- ANSI X3J11
692  * They don't exclude field widths read from args.
693  */
694  if ((width = va_arg(ap, int)) >= 0)
695  goto rflag;
696  width = -width;
697  /* FALLTHROUGH */
698  case '-':
699  flags |= LADJUST;
700  goto rflag;
701  case '+':
702  sign = '+';
703  goto rflag;
704  case '.':
705  if ((ch = *fmt++) == '*') {
706  n = va_arg(ap, int);
707  prec = n < 0 ? -1 : n;
708  goto rflag;
709  }
710  n = 0;
711  while (is_digit(ch)) {
712  n = 10 * n + to_digit(ch);
713  ch = *fmt++;
714  }
715  prec = n < 0 ? -1 : n;
716  goto reswitch;
717  case '0':
718  /*
719  * ``Note that 0 is taken as a flag, not as the
720  * beginning of a field width.''
721  * -- ANSI X3J11
722  */
723  flags |= ZEROPAD;
724  goto rflag;
725  case '1': case '2': case '3': case '4':
726  case '5': case '6': case '7': case '8': case '9':
727  n = 0;
728  do {
729  n = 10 * n + to_digit(ch);
730  ch = *fmt++;
731  } while (is_digit(ch));
732  width = n;
733  goto reswitch;
734 #ifdef FLOATING_POINT
735  case 'L':
736  flags |= LONGDBL;
737  goto rflag;
738 #endif
739  case 'h':
740  flags |= SHORTINT;
741  goto rflag;
742 #if SIZEOF_PTRDIFF_T == SIZEOF_LONG
743  case 't':
744 #endif
745 #if SIZEOF_SIZE_T == SIZEOF_LONG
746  case 'z':
747 #endif
748  case 'l':
749 #ifdef _HAVE_SANE_QUAD_
750  if (*fmt == 'l') {
751  fmt++;
752  flags |= QUADINT;
753  } else {
754  flags |= LONGINT;
755  }
756 #else
757  flags |= LONGINT;
758 #endif
759  goto rflag;
760 #ifdef _HAVE_SANE_QUAD_
761 #if SIZEOF_PTRDIFF_T == SIZEOF_LONG_LONG
762  case 't':
763 #endif
764 #if SIZEOF_SIZE_T == SIZEOF_LONG_LONG
765  case 'z':
766 #endif
767  case 'q':
768  flags |= QUADINT;
769  goto rflag;
770 #endif /* _HAVE_SANE_QUAD_ */
771 #ifdef _WIN32
772  case 'I':
773  if (*fmt == '3' && *(fmt + 1) == '2') {
774  fmt += 2;
775  flags |= LONGINT;
776  }
777 #ifdef _HAVE_SANE_QUAD_
778  else if (*fmt == '6' && *(fmt + 1) == '4') {
779  fmt += 2;
780  flags |= QUADINT;
781  }
782 #endif
783  else
784 #if defined(_HAVE_SANE_QUAD_) && SIZEOF_SIZE_T == SIZEOF_LONG_LONG
785  flags |= QUADINT;
786 #else
787  flags |= LONGINT;
788 #endif
789  goto rflag;
790 #endif
791  case 'c':
792  cp = buf;
793  *buf = (char)va_arg(ap, int);
794  size = 1;
795  sign = '\0';
796  break;
797  case 'i':
798 #ifdef _HAVE_SANE_QUAD_
799 # define INTPTR_MASK (QUADINT|LONGINT|SHORTINT)
800 #else
801 # define INTPTR_MASK (LONGINT|SHORTINT)
802 #endif
803 #if defined _HAVE_SANE_QUAD_ && SIZEOF_VOIDP == SIZEOF_LONG_LONG
804 # define INTPTR_FLAG QUADINT
805 #elif SIZEOF_VOIDP == SIZEOF_LONG
806 # define INTPTR_FLAG LONGINT
807 #else
808 # define INTPTR_FLAG 0
809 #endif
810 #ifdef PRI_EXTRA_MARK
811 # define IS_PRI_EXTRA_MARK(s) \
812  (PRI_EXTRA_MARK_LEN < 1 || \
813  (*(s) == PRI_EXTRA_MARK[0] && \
814  (PRI_EXTRA_MARK_LEN == 1 || \
815  strncmp((s)+1, &PRI_EXTRA_MARK[1], \
816  PRI_EXTRA_MARK_LEN-1) == 0)))
817 #else
818 # define PRI_EXTRA_MARK_LEN 0
819 # define IS_PRI_EXTRA_MARK(s) 1
820 #endif
821  if (fp->vextra && (flags & INTPTR_MASK) == INTPTR_FLAG &&
822  IS_PRI_EXTRA_MARK(fmt)) {
823  fmt += PRI_EXTRA_MARK_LEN;
824  FLUSH();
825 #if defined _HAVE_SANE_QUAD_ && SIZEOF_VOIDP == SIZEOF_LONG_LONG
826  uqval = va_arg(ap, u_quad_t);
827  cp = (*fp->vextra)(fp, sizeof(uqval), &uqval, &fieldsz, sign);
828 #else
829  ulval = va_arg(ap, u_long);
830  cp = (*fp->vextra)(fp, sizeof(ulval), &ulval, &fieldsz, sign);
831 #endif
832  sign = '\0';
833  if (!cp) goto error;
834  if (prec < 0) goto long_len;
835  size = fieldsz < prec ? (int)fieldsz : prec;
836  break;
837  }
838  goto decimal;
839  case 'D':
840  flags |= LONGINT;
841  /*FALLTHROUGH*/
842  case 'd':
843  decimal:
844 #ifdef _HAVE_SANE_QUAD_
845  if (flags & QUADINT) {
846  uqval = va_arg(ap, quad_t);
847  if ((quad_t)uqval < 0) {
848  uqval = -(quad_t)uqval;
849  sign = '-';
850  }
851  } else
852 #endif /* _HAVE_SANE_QUAD_ */
853  {
854  ulval = SARG();
855  if ((long)ulval < 0) {
856  ulval = (u_long)(-(long)ulval);
857  sign = '-';
858  }
859  }
860  base = 10;
861  goto number;
862 #ifdef FLOATING_POINT
863  case 'a':
864  case 'A':
865  if (prec > 0) {
866  flags |= ALT;
867  prec++;
868  fprec = prec;
869  }
870  goto fp_begin;
871  case 'e': /* anomalous precision */
872  case 'E':
873  if (prec != 0)
874  flags |= ALT;
875  prec = (prec == -1) ?
876  DEFPREC + 1 : (fprec = prec + 1);
877  /* FALLTHROUGH */
878  goto fp_begin;
879  case 'f': /* always print trailing zeroes */
880  if (prec != 0)
881  flags |= ALT;
882  case 'g':
883  case 'G':
884  if (prec == -1)
885  prec = DEFPREC;
886  else
887  fprec = prec;
888 fp_begin: _double = va_arg(ap, double);
889  /* do this before tricky precision changes */
890  if (isinf(_double)) {
891  if (_double < 0)
892  sign = '-';
893  cp = "Inf";
894  size = 3;
895  break;
896  }
897  if (isnan(_double)) {
898  cp = "NaN";
899  size = 3;
900  break;
901  }
902  flags |= FPT;
903  cp = cvt(_double, (prec < MAXFRACT ? prec : MAXFRACT), flags, &softsign,
904  &expt, ch, &ndig, buf);
905  if (ch == 'g' || ch == 'G') {
906  if (expt <= -4 || (expt > prec && expt > 1))
907  ch = (ch == 'g') ? 'e' : 'E';
908  else
909  ch = 'g';
910  }
911  if (ch == 'a' || ch == 'A') {
912  flags |= HEXPREFIX;
913  --expt;
914  expsize = exponent(expstr, expt, ch + 'p' - 'a');
915  ch += 'x' - 'a';
916  size = expsize + ndig;
917  if (ndig > 1 || flags & ALT)
918  ++size; /* floating point */
919  }
920  else if (ch <= 'e') { /* 'e' or 'E' fmt */
921  --expt;
922  expsize = exponent(expstr, expt, ch);
923  size = expsize + ndig;
924  if (ndig > 1 || flags & ALT)
925  ++fprec, ++size;
926  } else if (ch == 'f') { /* f fmt */
927  if (expt > 0) {
928  size = expt;
929  if (prec || flags & ALT)
930  size += prec + 1;
931  } else if (!prec) { /* "0" */
932  size = 1;
933  if (flags & ALT)
934  size += 1;
935  } else /* "0.X" */
936  size = prec + 2;
937  } else if (expt >= ndig) { /* fixed g fmt */
938  size = expt;
939  if (flags & ALT)
940  ++size;
941  } else
942  size = ndig + (expt > 0 ?
943  1 : 2 - expt);
944 
945  if (softsign)
946  sign = '-';
947  break;
948 #endif /* FLOATING_POINT */
949  case 'n':
950 #ifdef _HAVE_SANE_QUAD_
951  if (flags & QUADINT)
952  *va_arg(ap, quad_t *) = ret;
953  else if (flags & LONGINT)
954 #else /* _HAVE_SANE_QUAD_ */
955  if (flags & LONGINT)
956 #endif /* _HAVE_SANE_QUAD_ */
957  *va_arg(ap, long *) = ret;
958  else if (flags & SHORTINT)
959  *va_arg(ap, short *) = (short)ret;
960  else
961  *va_arg(ap, int *) = (int)ret;
962  continue; /* no output */
963  case 'O':
964  flags |= LONGINT;
965  /*FALLTHROUGH*/
966  case 'o':
967 #ifdef _HAVE_SANE_QUAD_
968  if (flags & QUADINT)
969  uqval = va_arg(ap, u_quad_t);
970  else
971 #endif /* _HAVE_SANE_QUAD_ */
972  ulval = UARG();
973  base = 8;
974  goto nosign;
975  case 'p':
976  /*
977  * ``The argument shall be a pointer to void. The
978  * value of the pointer is converted to a sequence
979  * of printable characters, in an implementation-
980  * defined manner.''
981  * -- ANSI X3J11
982  */
983  prec = (int)(sizeof(void*)*CHAR_BIT/4);
984 #ifdef _HAVE_LLP64_
985  uqval = (u_quad_t)va_arg(ap, void *);
986  flags = (flags) | QUADINT | HEXPREFIX;
987 #else
988  ulval = (u_long)va_arg(ap, void *);
989 #ifdef _HAVE_SANE_QUAD_
990  flags = (flags & ~QUADINT) | HEXPREFIX;
991 #else /* _HAVE_SANE_QUAD_ */
992  flags = (flags) | HEXPREFIX;
993 #endif /* _HAVE_SANE_QUAD_ */
994 #endif
995  base = 16;
996  xdigs = lower_hexdigits;
997  ch = 'x';
998  goto nosign;
999  case 's':
1000  if ((cp = va_arg(ap, char *)) == NULL)
1001  cp = "(null)";
1002  if (prec >= 0) {
1003  /*
1004  * can't use strlen; can only look for the
1005  * NUL in the first `prec' characters, and
1006  * strlen() will go further.
1007  */
1008  const char *p = (char *)memchr(cp, 0, prec);
1009 
1010  if (p != NULL && (p - cp) < prec)
1011  size = (int)(p - cp);
1012  else
1013  size = prec;
1014  }
1015  else {
1016  fieldsz = strlen(cp);
1017  goto long_len;
1018  }
1019  sign = '\0';
1020  break;
1021  case 'U':
1022  flags |= LONGINT;
1023  /*FALLTHROUGH*/
1024  case 'u':
1025 #ifdef _HAVE_SANE_QUAD_
1026  if (flags & QUADINT)
1027  uqval = va_arg(ap, u_quad_t);
1028  else
1029 #endif /* _HAVE_SANE_QUAD_ */
1030  ulval = UARG();
1031  base = 10;
1032  goto nosign;
1033  case 'X':
1034  xdigs = upper_hexdigits;
1035  goto hex;
1036  case 'x':
1037  xdigs = lower_hexdigits;
1038 hex:
1039 #ifdef _HAVE_SANE_QUAD_
1040  if (flags & QUADINT)
1041  uqval = va_arg(ap, u_quad_t);
1042  else
1043 #endif /* _HAVE_SANE_QUAD_ */
1044  ulval = UARG();
1045  base = 16;
1046  /* leading 0x/X only if non-zero */
1047  if (flags & ALT &&
1048 #ifdef _HAVE_SANE_QUAD_
1049  (flags & QUADINT ? uqval != 0 : ulval != 0)
1050 #else /* _HAVE_SANE_QUAD_ */
1051  ulval != 0
1052 #endif /* _HAVE_SANE_QUAD_ */
1053  )
1054  flags |= HEXPREFIX;
1055 
1056  /* unsigned conversions */
1057 nosign: sign = '\0';
1058  /*
1059  * ``... diouXx conversions ... if a precision is
1060  * specified, the 0 flag will be ignored.''
1061  * -- ANSI X3J11
1062  */
1063 number: if ((dprec = prec) >= 0)
1064  flags &= ~ZEROPAD;
1065 
1066  /*
1067  * ``The result of converting a zero value with an
1068  * explicit precision of zero is no characters.''
1069  * -- ANSI X3J11
1070  */
1071  cp = ebuf;
1072 #ifdef _HAVE_SANE_QUAD_
1073  if (flags & QUADINT) {
1074  if (uqval != 0 || prec != 0)
1075  cp = BSD__uqtoa(uqval, ebuf, base,
1076  flags & ALT, xdigs);
1077  } else
1078 #else /* _HAVE_SANE_QUAD_ */
1079 #endif /* _HAVE_SANE_QUAD_ */
1080  {
1081  if (ulval != 0 || prec != 0)
1082  cp = BSD__ultoa(ulval, ebuf, base,
1083  flags & ALT, xdigs);
1084  }
1085  size = (int)(ebuf - cp);
1086  break;
1087  default: /* "%?" prints ?, unless ? is NUL */
1088  if (ch == '\0')
1089  goto done;
1090  /* pretend it was %c with argument ch */
1091  cp = buf;
1092  *buf = ch;
1093  size = 1;
1094  sign = '\0';
1095  break;
1096  }
1097 
1098  /*
1099  * All reasonable formats wind up here. At this point, `cp'
1100  * points to a string which (if not flags&LADJUST) should be
1101  * padded out to `width' places. If flags&ZEROPAD, it should
1102  * first be prefixed by any sign or other prefix; otherwise,
1103  * it should be blank padded before the prefix is emitted.
1104  * After any left-hand padding and prefixing, emit zeroes
1105  * required by a decimal [diouxX] precision, then print the
1106  * string proper, then emit zeroes required by any leftover
1107  * floating precision; finally, if LADJUST, pad with blanks.
1108  *
1109  * Compute actual size, so we know how much to pad.
1110  * fieldsz excludes decimal prec; realsz includes it.
1111  */
1112  fieldsz = size;
1113 long_len:
1114  realsz = dprec > fieldsz ? dprec : fieldsz;
1115  if (sign)
1116  realsz++;
1117  if (flags & HEXPREFIX)
1118  realsz += 2;
1119 
1120  /* right-adjusting blank padding */
1121  if ((flags & (LADJUST|ZEROPAD)) == 0)
1122  PAD_L(width - realsz, blanks);
1123 
1124  /* prefix */
1125  if (sign) {
1126  PRINT(&sign, 1);
1127  }
1128  if (flags & HEXPREFIX) {
1129  ox[0] = '0';
1130  ox[1] = ch;
1131  PRINT(ox, 2);
1132  }
1133 
1134  /* right-adjusting zero padding */
1135  if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
1136  PAD_L(width - realsz, zeroes);
1137 
1138  /* leading zeroes from decimal precision */
1139  PAD_L(dprec - fieldsz, zeroes);
1140 
1141  /* the string or number proper */
1142 #ifdef FLOATING_POINT
1143  if ((flags & FPT) == 0) {
1144  PRINT(cp, fieldsz);
1145  } else { /* glue together f_p fragments */
1146  if (flags & HEXPREFIX) {
1147  if (ndig > 1 || flags & ALT) {
1148  ox[2] = *cp++;
1149  ox[3] = '.';
1150  PRINT(ox+2, 2);
1151  if (ndig > 0) PRINT(cp, ndig-1);
1152  } else /* XpYYY */
1153  PRINT(cp, 1);
1154  PAD(fprec-ndig, zeroes);
1155  PRINT(expstr, expsize);
1156  }
1157  else if (ch >= 'f') { /* 'f' or 'g' */
1158  if (_double == 0) {
1159  /* kludge for __dtoa irregularity */
1160  if (ndig <= 1 &&
1161  (flags & ALT) == 0) {
1162  PRINT("0", 1);
1163  } else {
1164  PRINT("0.", 2);
1165  PAD((ndig >= fprec ? ndig - 1 : fprec - (ch != 'f')),
1166  zeroes);
1167  }
1168  } else if (expt == 0 && ndig == 0 && (flags & ALT) == 0) {
1169  PRINT("0", 1);
1170  } else if (expt <= 0) {
1171  PRINT("0.", 2);
1172  PAD(-expt, zeroes);
1173  PRINT(cp, ndig);
1174  if (flags & ALT)
1175  PAD(fprec - ndig + (ch == 'f' ? expt : 0), zeroes);
1176  } else if (expt >= ndig) {
1177  PRINT(cp, ndig);
1178  PAD(expt - ndig, zeroes);
1179  if (flags & ALT)
1180  PRINT(".", 1);
1181  } else {
1182  PRINT(cp, expt);
1183  cp += expt;
1184  PRINT(".", 1);
1185  PRINT(cp, ndig-expt);
1186  if (flags & ALT)
1187  PAD(fprec - ndig + (ch == 'f' ? expt : 0), zeroes);
1188  }
1189  } else { /* 'e' or 'E' */
1190  if (ndig > 1 || flags & ALT) {
1191  ox[0] = *cp++;
1192  ox[1] = '.';
1193  PRINT(ox, 2);
1194  if (_double /*|| flags & ALT == 0*/) {
1195  PRINT(cp, ndig-1);
1196  } else /* 0.[0..] */
1197  /* __dtoa irregularity */
1198  PAD(ndig - 1, zeroes);
1199  if (flags & ALT) PAD(fprec - ndig - 1, zeroes);
1200  } else /* XeYYY */
1201  PRINT(cp, 1);
1202  PRINT(expstr, expsize);
1203  }
1204  }
1205 #else
1206  PRINT(cp, fieldsz);
1207 #endif
1208  /* left-adjusting padding (always blank) */
1209  if (flags & LADJUST)
1210  PAD_L(width - realsz, blanks);
1211 
1212  /* finally, adjust ret */
1213  ret += width > realsz ? width : realsz;
1214 
1215  FLUSH(); /* copy out the I/O vectors */
1216  }
1217 done:
1218  FLUSH();
1219 error:
1220  return (BSD__sferror(fp) ? EOF : ret);
1221  /* NOTREACHED */
1222 }
1223 
1224 #ifdef FLOATING_POINT
1225 
1226 extern char *BSD__dtoa(double, int, int, int *, int *, char **);
1227 extern char *BSD__hdtoa(double, const char *, int, int *, int *, char **);
1228 
1229 static char *
1230 cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch, int *length, char *buf)
1231 {
1232  int mode, dsgn;
1233  char *digits, *bp, *rve;
1234 
1235  if (ch == 'f')
1236  mode = 3;
1237  else {
1238  mode = 2;
1239  }
1240  if (value < 0) {
1241  value = -value;
1242  *sign = '-';
1243  } else if (value == 0.0 && signbit(value)) {
1244  *sign = '-';
1245  } else {
1246  *sign = '\000';
1247  }
1248  if (ch == 'a' || ch =='A') {
1249  digits = BSD__hdtoa(value,
1250  ch == 'a' ? lower_hexdigits : upper_hexdigits,
1251  ndigits, decpt, &dsgn, &rve);
1252  }
1253  else {
1254  digits = BSD__dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
1255  }
1256  buf[0] = 0; /* rve - digits may be 0 */
1257  memcpy(buf, digits, rve - digits);
1258  rve = buf + (rve - digits);
1259  free(digits);
1260  digits = buf;
1261  if (flags & ALT) { /* Print trailing zeros */
1262  bp = digits + ndigits;
1263  if (ch == 'f') {
1264  if (*digits == '0' && value)
1265  *decpt = -ndigits + 1;
1266  bp += *decpt;
1267  }
1268  while (rve < bp)
1269  *rve++ = '0';
1270  }
1271  *length = (int)(rve - digits);
1272  return (digits);
1273 }
1274 
1275 static int
1276 exponent(char *p0, int exp, int fmtch)
1277 {
1278  register char *p, *t;
1279  char expbuf[2 + (MAXEXP < 1000 ? 3 : MAXEXP < 10000 ? 4 : 5)]; /* >= 2 + ceil(log10(MAXEXP)) */
1280 
1281  p = p0;
1282  *p++ = fmtch;
1283  if (exp < 0) {
1284  exp = -exp;
1285  *p++ = '-';
1286  }
1287  else
1288  *p++ = '+';
1289  t = expbuf + sizeof(expbuf);
1290  if (exp > 9) {
1291  do {
1292  *--t = to_char(exp % 10);
1293  } while ((exp /= 10) > 9);
1294  *--t = to_char(exp);
1295  for (; t < expbuf + sizeof(expbuf); *p++ = *t++);
1296  }
1297  else {
1298  if (fmtch & 15) *p++ = '0'; /* other than p or P */
1299  *p++ = to_char(exp);
1300  }
1301  return (int)(p - p0);
1302 }
1303 #endif /* FLOATING_POINT */
rb_strlen_lit
#define rb_strlen_lit(str)
Length of a string literal.
Definition: string.h:1692
len
int len
Length of the buffer.
Definition: io.h:8
stdarg.h
Defines old _.
__sFILE
Definition: vsnprintf.c:160
__sbuf
Definition: vsnprintf.c:126
__siov
Definition: vsnprintf.c:217
__suio
Definition: vsnprintf.c:221
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