7f8ff31779477f1df85395262bc0c19b2d9e8423
1 /* $OpenBSD: vfprintf.c,v 1.66 2014/05/03 12:36:45 deraadt Exp $ */
2 /*-
3 * Copyright (c) 1990 The Regents of the University of California.
4 * All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Chris Torek.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
34 /*
35 * Actual printf innards.
36 *
37 * This code is large and complicated...
38 */
40 #include <sys/types.h>
41 #include <sys/mman.h>
43 #include <errno.h>
44 #include <langinfo.h>
45 #include <limits.h>
46 #include <stdarg.h>
47 #include <stddef.h>
48 #include <stdio.h>
49 #include <stdint.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <wchar.h>
55 #include "local.h"
56 #include "fvwrite.h"
58 union arg {
59 int intarg;
60 unsigned int uintarg;
61 long longarg;
62 unsigned long ulongarg;
63 long long longlongarg;
64 unsigned long long ulonglongarg;
65 ptrdiff_t ptrdiffarg;
66 size_t sizearg;
67 ssize_t ssizearg;
68 intmax_t intmaxarg;
69 uintmax_t uintmaxarg;
70 void *pvoidarg;
71 char *pchararg;
72 signed char *pschararg;
73 short *pshortarg;
74 int *pintarg;
75 long *plongarg;
76 long long *plonglongarg;
77 ptrdiff_t *pptrdiffarg;
78 ssize_t *pssizearg;
79 intmax_t *pintmaxarg;
80 #ifdef FLOATING_POINT
81 double doublearg;
82 long double longdoublearg;
83 #endif
84 #ifdef PRINTF_WIDE_CHAR
85 wint_t wintarg;
86 wchar_t *pwchararg;
87 #endif
88 };
90 static int __find_arguments(const char *fmt0, va_list ap, union arg **argtable,
91 size_t *argtablesiz);
92 static int __grow_type_table(unsigned char **typetable, int *tablesize);
94 /*
95 * Flush out all the vectors defined by the given uio,
96 * then reset it so that it can be reused.
97 */
98 static int
99 __sprint(FILE *fp, struct __suio *uio)
100 {
101 int err;
103 if (uio->uio_resid == 0) {
104 uio->uio_iovcnt = 0;
105 return (0);
106 }
107 err = __sfvwrite(fp, uio);
108 uio->uio_resid = 0;
109 uio->uio_iovcnt = 0;
110 return (err);
111 }
113 /*
114 * Helper function for `fprintf to unbuffered unix file': creates a
115 * temporary buffer. We only work on write-only files; this avoids
116 * worries about ungetc buffers and so forth.
117 */
118 static int
119 __sbprintf(FILE *fp, const char *fmt, va_list ap)
120 {
121 int ret;
122 FILE fake;
123 struct __sfileext fakeext;
124 unsigned char buf[BUFSIZ];
126 _FILEEXT_SETUP(&fake, &fakeext);
127 /* copy the important variables */
128 fake._flags = fp->_flags & ~__SNBF;
129 fake._file = fp->_file;
130 fake._cookie = fp->_cookie;
131 fake._write = fp->_write;
133 /* set up the buffer */
134 fake._bf._base = fake._p = buf;
135 fake._bf._size = fake._w = sizeof(buf);
136 fake._lbfsize = 0; /* not actually used, but Just In Case */
138 /* do the work, then copy any error status */
139 ret = __vfprintf(&fake, fmt, ap);
140 if (ret >= 0 && __sflush(&fake))
141 ret = EOF;
142 if (fake._flags & __SERR)
143 fp->_flags |= __SERR;
144 return (ret);
145 }
147 #ifdef PRINTF_WIDE_CHAR
148 /*
149 * Convert a wide character string argument for the %ls format to a multibyte
150 * string representation. If not -1, prec specifies the maximum number of
151 * bytes to output, and also means that we can't assume that the wide char
152 * string is null-terminated.
153 */
154 static char *
155 __wcsconv(wchar_t *wcsarg, int prec)
156 {
157 mbstate_t mbs;
158 char buf[MB_LEN_MAX];
159 wchar_t *p;
160 char *convbuf;
161 size_t clen, nbytes;
163 /* Allocate space for the maximum number of bytes we could output. */
164 if (prec < 0) {
165 memset(&mbs, 0, sizeof(mbs));
166 p = wcsarg;
167 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs);
168 if (nbytes == (size_t)-1) {
169 errno = EILSEQ;
170 return (NULL);
171 }
172 } else {
173 /*
174 * Optimisation: if the output precision is small enough,
175 * just allocate enough memory for the maximum instead of
176 * scanning the string.
177 */
178 if (prec < 128)
179 nbytes = prec;
180 else {
181 nbytes = 0;
182 p = wcsarg;
183 memset(&mbs, 0, sizeof(mbs));
184 for (;;) {
185 clen = wcrtomb(buf, *p++, &mbs);
186 if (clen == 0 || clen == (size_t)-1 ||
187 nbytes + clen > (size_t)prec)
188 break;
189 nbytes += clen;
190 }
191 if (clen == (size_t)-1) {
192 errno = EILSEQ;
193 return (NULL);
194 }
195 }
196 }
197 if ((convbuf = malloc(nbytes + 1)) == NULL)
198 return (NULL);
200 /* Fill the output buffer. */
201 p = wcsarg;
202 memset(&mbs, 0, sizeof(mbs));
203 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p,
204 nbytes, &mbs)) == (size_t)-1) {
205 free(convbuf);
206 errno = EILSEQ;
207 return (NULL);
208 }
209 convbuf[nbytes] = '\0';
210 return (convbuf);
211 }
212 #endif
214 #ifdef FLOATING_POINT
215 #include <float.h>
216 #include <locale.h>
217 #include <math.h>
218 #include "floatio.h"
219 #include "gdtoa.h"
221 #define DEFPREC 6
223 static int exponent(char *, int, int);
224 #endif /* FLOATING_POINT */
226 /*
227 * The size of the buffer we use as scratch space for integer
228 * conversions, among other things. Technically, we would need the
229 * most space for base 10 conversions with thousands' grouping
230 * characters between each pair of digits. 100 bytes is a
231 * conservative overestimate even for a 128-bit uintmax_t.
232 */
233 #define BUF 100
235 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
238 /*
239 * Macros for converting digits to letters and vice versa
240 */
241 #define to_digit(c) ((c) - '0')
242 #define is_digit(c) ((unsigned)to_digit(c) <= 9)
243 #define to_char(n) ((n) + '0')
245 /*
246 * Flags used during conversion.
247 */
248 #define ALT 0x0001 /* alternate form */
249 #define LADJUST 0x0004 /* left adjustment */
250 #define LONGDBL 0x0008 /* long double */
251 #define LONGINT 0x0010 /* long integer */
252 #define LLONGINT 0x0020 /* long long integer */
253 #define SHORTINT 0x0040 /* short integer */
254 #define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */
255 #define FPT 0x0100 /* Floating point number */
256 #define PTRINT 0x0200 /* (unsigned) ptrdiff_t */
257 #define SIZEINT 0x0400 /* (signed) size_t */
258 #define CHARINT 0x0800 /* 8 bit integer */
259 #define MAXINT 0x1000 /* largest integer size (intmax_t) */
261 int
262 vfprintf(FILE *fp, const char *fmt0, __va_list ap)
263 {
264 int ret;
266 FLOCKFILE(fp);
267 ret = __vfprintf(fp, fmt0, ap);
268 FUNLOCKFILE(fp);
269 return (ret);
270 }
272 int
273 __vfprintf(FILE *fp, const char *fmt0, __va_list ap)
274 {
275 char *fmt; /* format string */
276 int ch; /* character from fmt */
277 int n, n2; /* handy integers (short term usage) */
278 char *cp; /* handy char pointer (short term usage) */
279 struct __siov *iovp; /* for PRINT macro */
280 int flags; /* flags as above */
281 int ret; /* return value accumulator */
282 int width; /* width from format (%8d), or 0 */
283 int prec; /* precision from format; <0 for N/A */
284 char sign; /* sign prefix (' ', '+', '-', or \0) */
285 wchar_t wc;
286 mbstate_t ps;
287 #ifdef FLOATING_POINT
288 /*
289 * We can decompose the printed representation of floating
290 * point numbers into several parts, some of which may be empty:
291 *
292 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ
293 * A B ---C--- D E F
294 *
295 * A: 'sign' holds this value if present; '\0' otherwise
296 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal
297 * C: cp points to the string MMMNNN. Leading and trailing
298 * zeros are not in the string and must be added.
299 * D: expchar holds this character; '\0' if no exponent, e.g. %f
300 * F: at least two digits for decimal, at least one digit for hex
301 */
302 char *decimal_point = NULL;
303 int signflag; /* true if float is negative */
304 union { /* floating point arguments %[aAeEfFgG] */
305 double dbl;
306 long double ldbl;
307 } fparg;
308 int expt; /* integer value of exponent */
309 char expchar; /* exponent character: [eEpP\0] */
310 char *dtoaend; /* pointer to end of converted digits */
311 int expsize; /* character count for expstr */
312 int lead; /* sig figs before decimal or group sep */
313 int ndig; /* actual number of digits returned by dtoa */
314 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */
315 char *dtoaresult = NULL;
316 #endif
318 uintmax_t _umax; /* integer arguments %[diouxX] */
319 enum { OCT, DEC, HEX } base; /* base for %[diouxX] conversion */
320 int dprec; /* a copy of prec if %[diouxX], 0 otherwise */
321 int realsz; /* field size expanded by dprec */
322 int size; /* size of converted field or string */
323 const char *xdigs; /* digits for %[xX] conversion */
324 #define NIOV 8
325 struct __suio uio; /* output information: summary */
326 struct __siov iov[NIOV];/* ... and individual io vectors */
327 char buf[BUF]; /* buffer with space for digits of uintmax_t */
328 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */
329 union arg *argtable; /* args, built due to positional arg */
330 union arg statargtable[STATIC_ARG_TBL_SIZE];
331 size_t argtablesiz;
332 int nextarg; /* 1-based argument index */
333 va_list orgap; /* original argument pointer */
334 #ifdef PRINTF_WIDE_CHAR
335 char *convbuf; /* buffer for wide to multi-byte conversion */
336 #endif
338 /*
339 * Choose PADSIZE to trade efficiency vs. size. If larger printf
340 * fields occur frequently, increase PADSIZE and make the initialisers
341 * below longer.
342 */
343 #define PADSIZE 16 /* pad chunk size */
344 static char blanks[PADSIZE] =
345 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
346 static char zeroes[PADSIZE] =
347 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
349 static const char xdigs_lower[16] = "0123456789abcdef";
350 static const char xdigs_upper[16] = "0123456789ABCDEF";
352 /*
353 * BEWARE, these `goto error' on error, and PAD uses `n'.
354 */
355 #define PRINT(ptr, len) do { \
356 iovp->iov_base = (ptr); \
357 iovp->iov_len = (len); \
358 uio.uio_resid += (len); \
359 iovp++; \
360 if (++uio.uio_iovcnt >= NIOV) { \
361 if (__sprint(fp, &uio)) \
362 goto error; \
363 iovp = iov; \
364 } \
365 } while (0)
366 #define PAD(howmany, with) do { \
367 if ((n = (howmany)) > 0) { \
368 while (n > PADSIZE) { \
369 PRINT(with, PADSIZE); \
370 n -= PADSIZE; \
371 } \
372 PRINT(with, n); \
373 } \
374 } while (0)
375 #define PRINTANDPAD(p, ep, len, with) do { \
376 n2 = (ep) - (p); \
377 if (n2 > (len)) \
378 n2 = (len); \
379 if (n2 > 0) \
380 PRINT((p), n2); \
381 PAD((len) - (n2 > 0 ? n2 : 0), (with)); \
382 } while(0)
383 #define FLUSH() do { \
384 if (uio.uio_resid && __sprint(fp, &uio)) \
385 goto error; \
386 uio.uio_iovcnt = 0; \
387 iovp = iov; \
388 } while (0)
390 /*
391 * To extend shorts properly, we need both signed and unsigned
392 * argument extraction methods.
393 */
394 #define SARG() \
395 ((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \
396 flags&LLONGINT ? GETARG(long long) : \
397 flags&LONGINT ? GETARG(long) : \
398 flags&PTRINT ? GETARG(ptrdiff_t) : \
399 flags&SIZEINT ? GETARG(ssize_t) : \
400 flags&SHORTINT ? (short)GETARG(int) : \
401 flags&CHARINT ? (signed char)GETARG(int) : \
402 GETARG(int)))
403 #define UARG() \
404 ((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \
405 flags&LLONGINT ? GETARG(unsigned long long) : \
406 flags&LONGINT ? GETARG(unsigned long) : \
407 flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \
408 flags&SIZEINT ? GETARG(size_t) : \
409 flags&SHORTINT ? (unsigned short)GETARG(int) : \
410 flags&CHARINT ? (unsigned char)GETARG(int) : \
411 GETARG(unsigned int)))
413 /*
414 * Append a digit to a value and check for overflow.
415 */
416 #define APPEND_DIGIT(val, dig) do { \
417 if ((val) > INT_MAX / 10) \
418 goto overflow; \
419 (val) *= 10; \
420 if ((val) > INT_MAX - to_digit((dig))) \
421 goto overflow; \
422 (val) += to_digit((dig)); \
423 } while (0)
425 /*
426 * Get * arguments, including the form *nn$. Preserve the nextarg
427 * that the argument can be gotten once the type is determined.
428 */
429 #define GETASTER(val) \
430 n2 = 0; \
431 cp = fmt; \
432 while (is_digit(*cp)) { \
433 APPEND_DIGIT(n2, *cp); \
434 cp++; \
435 } \
436 if (*cp == '$') { \
437 int hold = nextarg; \
438 if (argtable == NULL) { \
439 argtable = statargtable; \
440 __find_arguments(fmt0, orgap, &argtable, &argtablesiz); \
441 } \
442 nextarg = n2; \
443 val = GETARG(int); \
444 nextarg = hold; \
445 fmt = ++cp; \
446 } else { \
447 val = GETARG(int); \
448 }
450 /*
451 * Get the argument indexed by nextarg. If the argument table is
452 * built, use it to get the argument. If its not, get the next
453 * argument (and arguments must be gotten sequentially).
454 */
455 #define GETARG(type) \
456 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \
457 (nextarg++, va_arg(ap, type)))
459 _SET_ORIENTATION(fp, -1);
460 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
461 if (cantwrite(fp)) {
462 errno = EBADF;
463 return (EOF);
464 }
466 /* optimise fprintf(stderr) (and other unbuffered Unix files) */
467 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
468 fp->_file >= 0)
469 return (__sbprintf(fp, fmt0, ap));
471 fmt = (char *)fmt0;
472 argtable = NULL;
473 nextarg = 1;
474 va_copy(orgap, ap);
475 uio.uio_iov = iovp = iov;
476 uio.uio_resid = 0;
477 uio.uio_iovcnt = 0;
478 ret = 0;
479 #ifdef PRINTF_WIDE_CHAR
480 convbuf = NULL;
481 #endif
483 memset(&ps, 0, sizeof(ps));
484 /*
485 * Scan the format for conversions (`%' character).
486 */
487 for (;;) {
488 cp = fmt;
489 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) {
490 fmt += n;
491 if (wc == '%') {
492 fmt--;
493 break;
494 }
495 }
496 if (fmt != cp) {
497 ptrdiff_t m = fmt - cp;
498 if (m < 0 || m > INT_MAX - ret)
499 goto overflow;
500 PRINT(cp, m);
501 ret += m;
502 }
503 if (n <= 0)
504 goto done;
505 fmt++; /* skip over '%' */
507 flags = 0;
508 dprec = 0;
509 width = 0;
510 prec = -1;
511 sign = '\0';
512 ox[1] = '\0';
514 rflag: ch = *fmt++;
515 reswitch: switch (ch) {
516 case ' ':
517 /*
518 * ``If the space and + flags both appear, the space
519 * flag will be ignored.''
520 * -- ANSI X3J11
521 */
522 if (!sign)
523 sign = ' ';
524 goto rflag;
525 case '#':
526 flags |= ALT;
527 goto rflag;
528 case '\'':
529 /* grouping not implemented */
530 goto rflag;
531 case '*':
532 /*
533 * ``A negative field width argument is taken as a
534 * - flag followed by a positive field width.''
535 * -- ANSI X3J11
536 * They don't exclude field widths read from args.
537 */
538 GETASTER(width);
539 if (width >= 0)
540 goto rflag;
541 if (width == INT_MIN)
542 goto overflow;
543 width = -width;
544 /* FALLTHROUGH */
545 case '-':
546 flags |= LADJUST;
547 goto rflag;
548 case '+':
549 sign = '+';
550 goto rflag;
551 case '.':
552 if ((ch = *fmt++) == '*') {
553 GETASTER(n);
554 prec = n < 0 ? -1 : n;
555 goto rflag;
556 }
557 n = 0;
558 while (is_digit(ch)) {
559 APPEND_DIGIT(n, ch);
560 ch = *fmt++;
561 }
562 if (ch == '$') {
563 nextarg = n;
564 if (argtable == NULL) {
565 argtable = statargtable;
566 __find_arguments(fmt0, orgap,
567 &argtable, &argtablesiz);
568 }
569 goto rflag;
570 }
571 prec = n;
572 goto reswitch;
573 case '0':
574 /*
575 * ``Note that 0 is taken as a flag, not as the
576 * beginning of a field width.''
577 * -- ANSI X3J11
578 */
579 flags |= ZEROPAD;
580 goto rflag;
581 case '1': case '2': case '3': case '4':
582 case '5': case '6': case '7': case '8': case '9':
583 n = 0;
584 do {
585 APPEND_DIGIT(n, ch);
586 ch = *fmt++;
587 } while (is_digit(ch));
588 if (ch == '$') {
589 nextarg = n;
590 if (argtable == NULL) {
591 argtable = statargtable;
592 __find_arguments(fmt0, orgap,
593 &argtable, &argtablesiz);
594 }
595 goto rflag;
596 }
597 width = n;
598 goto reswitch;
599 #ifdef FLOATING_POINT
600 case 'L':
601 flags |= LONGDBL;
602 goto rflag;
603 #endif
604 case 'h':
605 if (*fmt == 'h') {
606 fmt++;
607 flags |= CHARINT;
608 } else {
609 flags |= SHORTINT;
610 }
611 goto rflag;
612 case 'j':
613 flags |= MAXINT;
614 goto rflag;
615 case 'l':
616 if (*fmt == 'l') {
617 fmt++;
618 flags |= LLONGINT;
619 } else {
620 flags |= LONGINT;
621 }
622 goto rflag;
623 case 'q':
624 flags |= LLONGINT;
625 goto rflag;
626 case 't':
627 flags |= PTRINT;
628 goto rflag;
629 case 'z':
630 flags |= SIZEINT;
631 goto rflag;
632 case 'c':
633 #ifdef PRINTF_WIDE_CHAR
634 if (flags & LONGINT) {
635 mbstate_t mbs;
636 size_t mbseqlen;
638 memset(&mbs, 0, sizeof(mbs));
639 mbseqlen = wcrtomb(buf,
640 (wchar_t)GETARG(wint_t), &mbs);
641 if (mbseqlen == (size_t)-1) {
642 fp->_flags |= __SERR;
643 errno = EILSEQ;
644 goto error;
645 }
646 cp = buf;
647 size = (int)mbseqlen;
648 } else {
649 #endif
650 *(cp = buf) = GETARG(int);
651 size = 1;
652 #ifdef PRINTF_WIDE_CHAR
653 }
654 #endif
655 sign = '\0';
656 break;
657 case 'D':
658 flags |= LONGINT;
659 /*FALLTHROUGH*/
660 case 'd':
661 case 'i':
662 _umax = SARG();
663 if ((intmax_t)_umax < 0) {
664 _umax = -_umax;
665 sign = '-';
666 }
667 base = DEC;
668 goto number;
669 #ifdef FLOATING_POINT
670 case 'a':
671 case 'A':
672 if (ch == 'a') {
673 ox[1] = 'x';
674 xdigs = xdigs_lower;
675 expchar = 'p';
676 } else {
677 ox[1] = 'X';
678 xdigs = xdigs_upper;
679 expchar = 'P';
680 }
681 if (prec >= 0)
682 prec++;
683 if (dtoaresult)
684 __freedtoa(dtoaresult);
685 if (flags & LONGDBL) {
686 fparg.ldbl = GETARG(long double);
687 dtoaresult = cp =
688 __hldtoa(fparg.ldbl, xdigs, prec,
689 &expt, &signflag, &dtoaend);
690 if (dtoaresult == NULL) {
691 errno = ENOMEM;
692 goto error;
693 }
694 } else {
695 fparg.dbl = GETARG(double);
696 dtoaresult = cp =
697 __hdtoa(fparg.dbl, xdigs, prec,
698 &expt, &signflag, &dtoaend);
699 if (dtoaresult == NULL) {
700 errno = ENOMEM;
701 goto error;
702 }
703 }
704 if (prec < 0)
705 prec = dtoaend - cp;
706 if (expt == INT_MAX)
707 ox[1] = '\0';
708 goto fp_common;
709 case 'e':
710 case 'E':
711 expchar = ch;
712 if (prec < 0) /* account for digit before decpt */
713 prec = DEFPREC + 1;
714 else
715 prec++;
716 goto fp_begin;
717 case 'f':
718 case 'F':
719 expchar = '\0';
720 goto fp_begin;
721 case 'g':
722 case 'G':
723 expchar = ch - ('g' - 'e');
724 if (prec == 0)
725 prec = 1;
726 fp_begin:
727 if (prec < 0)
728 prec = DEFPREC;
729 if (dtoaresult)
730 __freedtoa(dtoaresult);
731 if (flags & LONGDBL) {
732 fparg.ldbl = GETARG(long double);
733 dtoaresult = cp =
734 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
735 &expt, &signflag, &dtoaend);
736 if (dtoaresult == NULL) {
737 errno = ENOMEM;
738 goto error;
739 }
740 } else {
741 fparg.dbl = GETARG(double);
742 dtoaresult = cp =
743 __dtoa(fparg.dbl, expchar ? 2 : 3, prec,
744 &expt, &signflag, &dtoaend);
745 if (dtoaresult == NULL) {
746 errno = ENOMEM;
747 goto error;
748 }
749 if (expt == 9999)
750 expt = INT_MAX;
751 }
752 fp_common:
753 if (signflag)
754 sign = '-';
755 if (expt == INT_MAX) { /* inf or nan */
756 if (*cp == 'N') {
757 cp = (ch >= 'a') ? "nan" : "NAN";
758 sign = '\0';
759 } else
760 cp = (ch >= 'a') ? "inf" : "INF";
761 size = 3;
762 flags &= ~ZEROPAD;
763 break;
764 }
765 flags |= FPT;
766 ndig = dtoaend - cp;
767 if (ch == 'g' || ch == 'G') {
768 if (expt > -4 && expt <= prec) {
769 /* Make %[gG] smell like %[fF] */
770 expchar = '\0';
771 if (flags & ALT)
772 prec -= expt;
773 else
774 prec = ndig - expt;
775 if (prec < 0)
776 prec = 0;
777 } else {
778 /*
779 * Make %[gG] smell like %[eE], but
780 * trim trailing zeroes if no # flag.
781 */
782 if (!(flags & ALT))
783 prec = ndig;
784 }
785 }
786 if (expchar) {
787 expsize = exponent(expstr, expt - 1, expchar);
788 size = expsize + prec;
789 if (prec > 1 || flags & ALT)
790 ++size;
791 } else {
792 /* space for digits before decimal point */
793 if (expt > 0)
794 size = expt;
795 else /* "0" */
796 size = 1;
797 /* space for decimal pt and following digits */
798 if (prec || flags & ALT)
799 size += prec + 1;
800 lead = expt;
801 }
802 break;
803 #endif /* FLOATING_POINT */
804 #ifndef NO_PRINTF_PERCENT_N
805 case 'n':
806 if (flags & LLONGINT)
807 *GETARG(long long *) = ret;
808 else if (flags & LONGINT)
809 *GETARG(long *) = ret;
810 else if (flags & SHORTINT)
811 *GETARG(short *) = ret;
812 else if (flags & CHARINT)
813 *GETARG(signed char *) = ret;
814 else if (flags & PTRINT)
815 *GETARG(ptrdiff_t *) = ret;
816 else if (flags & SIZEINT)
817 *GETARG(ssize_t *) = ret;
818 else if (flags & MAXINT)
819 *GETARG(intmax_t *) = ret;
820 else
821 *GETARG(int *) = ret;
822 continue; /* no output */
823 #endif /* NO_PRINTF_PERCENT_N */
824 case 'O':
825 flags |= LONGINT;
826 /*FALLTHROUGH*/
827 case 'o':
828 _umax = UARG();
829 base = OCT;
830 goto nosign;
831 case 'p':
832 /*
833 * ``The argument shall be a pointer to void. The
834 * value of the pointer is converted to a sequence
835 * of printable characters, in an implementation-
836 * defined manner.''
837 * -- ANSI X3J11
838 */
839 /* NOSTRICT */
840 _umax = (u_long)GETARG(void *);
841 base = HEX;
842 xdigs = xdigs_lower;
843 ox[1] = 'x';
844 goto nosign;
845 case 's':
846 #ifdef PRINTF_WIDE_CHAR
847 if (flags & LONGINT) {
848 wchar_t *wcp;
850 if (convbuf != NULL) {
851 free(convbuf);
852 convbuf = NULL;
853 }
854 if ((wcp = GETARG(wchar_t *)) == NULL) {
855 cp = "(null)";
856 } else {
857 convbuf = __wcsconv(wcp, prec);
858 if (convbuf == NULL) {
859 fp->_flags = __SERR;
860 goto error;
861 }
862 cp = convbuf;
863 }
864 } else
865 #endif /* PRINTF_WIDE_CHAR */
866 if ((cp = GETARG(char *)) == NULL)
867 cp = "(null)";
868 if (prec >= 0) {
869 /*
870 * can't use strlen; can only look for the
871 * NUL in the first `prec' characters, and
872 * strlen() will go further.
873 */
874 char *p = memchr(cp, 0, prec);
876 size = p ? (p - cp) : prec;
877 } else {
878 size_t len;
880 if ((len = strlen(cp)) > INT_MAX)
881 goto overflow;
882 size = (int)len;
883 }
884 sign = '\0';
885 break;
886 case 'U':
887 flags |= LONGINT;
888 /*FALLTHROUGH*/
889 case 'u':
890 _umax = UARG();
891 base = DEC;
892 goto nosign;
893 case 'X':
894 xdigs = xdigs_upper;
895 goto hex;
896 case 'x':
897 xdigs = xdigs_lower;
898 hex: _umax = UARG();
899 base = HEX;
900 /* leading 0x/X only if non-zero */
901 if (flags & ALT && _umax != 0)
902 ox[1] = ch;
904 /* unsigned conversions */
905 nosign: sign = '\0';
906 /*
907 * ``... diouXx conversions ... if a precision is
908 * specified, the 0 flag will be ignored.''
909 * -- ANSI X3J11
910 */
911 number: if ((dprec = prec) >= 0)
912 flags &= ~ZEROPAD;
914 /*
915 * ``The result of converting a zero value with an
916 * explicit precision of zero is no characters.''
917 * -- ANSI X3J11
918 */
919 cp = buf + BUF;
920 if (_umax != 0 || prec != 0) {
921 /*
922 * Unsigned mod is hard, and unsigned mod
923 * by a constant is easier than that by
924 * a variable; hence this switch.
925 */
926 switch (base) {
927 case OCT:
928 do {
929 *--cp = to_char(_umax & 7);
930 _umax >>= 3;
931 } while (_umax);
932 /* handle octal leading 0 */
933 if (flags & ALT && *cp != '0')
934 *--cp = '0';
935 break;
937 case DEC:
938 /* many numbers are 1 digit */
939 while (_umax >= 10) {
940 *--cp = to_char(_umax % 10);
941 _umax /= 10;
942 }
943 *--cp = to_char(_umax);
944 break;
946 case HEX:
947 do {
948 *--cp = xdigs[_umax & 15];
949 _umax >>= 4;
950 } while (_umax);
951 break;
953 default:
954 cp = "bug in vfprintf: bad base";
955 size = strlen(cp);
956 goto skipsize;
957 }
958 }
959 size = buf + BUF - cp;
960 if (size > BUF) /* should never happen */
961 abort();
962 skipsize:
963 break;
964 default: /* "%?" prints ?, unless ? is NUL */
965 if (ch == '\0')
966 goto done;
967 /* pretend it was %c with argument ch */
968 cp = buf;
969 *cp = ch;
970 size = 1;
971 sign = '\0';
972 break;
973 }
975 /*
976 * All reasonable formats wind up here. At this point, `cp'
977 * points to a string which (if not flags&LADJUST) should be
978 * padded out to `width' places. If flags&ZEROPAD, it should
979 * first be prefixed by any sign or other prefix; otherwise,
980 * it should be blank padded before the prefix is emitted.
981 * After any left-hand padding and prefixing, emit zeroes
982 * required by a decimal %[diouxX] precision, then print the
983 * string proper, then emit zeroes required by any leftover
984 * floating precision; finally, if LADJUST, pad with blanks.
985 *
986 * Compute actual size, so we know how much to pad.
987 * size excludes decimal prec; realsz includes it.
988 */
989 realsz = dprec > size ? dprec : size;
990 if (sign)
991 realsz++;
992 if (ox[1])
993 realsz+= 2;
995 /* right-adjusting blank padding */
996 if ((flags & (LADJUST|ZEROPAD)) == 0)
997 PAD(width - realsz, blanks);
999 /* prefix */
1000 if (sign)
1001 PRINT(&sign, 1);
1002 if (ox[1]) { /* ox[1] is either x, X, or \0 */
1003 ox[0] = '0';
1004 PRINT(ox, 2);
1005 }
1007 /* right-adjusting zero padding */
1008 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
1009 PAD(width - realsz, zeroes);
1011 /* leading zeroes from decimal precision */
1012 PAD(dprec - size, zeroes);
1014 /* the string or number proper */
1015 #ifdef FLOATING_POINT
1016 if ((flags & FPT) == 0) {
1017 PRINT(cp, size);
1018 } else { /* glue together f_p fragments */
1019 if (decimal_point == NULL)
1020 decimal_point = nl_langinfo(RADIXCHAR);
1021 if (!expchar) { /* %[fF] or sufficiently short %[gG] */
1022 if (expt <= 0) {
1023 PRINT(zeroes, 1);
1024 if (prec || flags & ALT)
1025 PRINT(decimal_point, 1);
1026 PAD(-expt, zeroes);
1027 /* already handled initial 0's */
1028 prec += expt;
1029 } else {
1030 PRINTANDPAD(cp, dtoaend, lead, zeroes);
1031 cp += lead;
1032 if (prec || flags & ALT)
1033 PRINT(decimal_point, 1);
1034 }
1035 PRINTANDPAD(cp, dtoaend, prec, zeroes);
1036 } else { /* %[eE] or sufficiently long %[gG] */
1037 if (prec > 1 || flags & ALT) {
1038 buf[0] = *cp++;
1039 buf[1] = *decimal_point;
1040 PRINT(buf, 2);
1041 PRINT(cp, ndig-1);
1042 PAD(prec - ndig, zeroes);
1043 } else { /* XeYYY */
1044 PRINT(cp, 1);
1045 }
1046 PRINT(expstr, expsize);
1047 }
1048 }
1049 #else
1050 PRINT(cp, size);
1051 #endif
1052 /* left-adjusting padding (always blank) */
1053 if (flags & LADJUST)
1054 PAD(width - realsz, blanks);
1056 /* finally, adjust ret */
1057 if (width < realsz)
1058 width = realsz;
1059 if (width > INT_MAX - ret)
1060 goto overflow;
1061 ret += width;
1063 FLUSH(); /* copy out the I/O vectors */
1064 }
1065 done:
1066 FLUSH();
1067 error:
1068 va_end(orgap);
1069 if (__sferror(fp))
1070 ret = -1;
1071 goto finish;
1073 overflow:
1074 errno = ENOMEM;
1075 ret = -1;
1077 finish:
1078 #ifdef PRINTF_WIDE_CHAR
1079 if (convbuf)
1080 free(convbuf);
1081 #endif
1082 #ifdef FLOATING_POINT
1083 if (dtoaresult)
1084 __freedtoa(dtoaresult);
1085 #endif
1086 if (argtable != NULL && argtable != statargtable) {
1087 munmap(argtable, argtablesiz);
1088 argtable = NULL;
1089 }
1090 return (ret);
1091 }
1093 /*
1094 * Type ids for argument type table.
1095 */
1096 #define T_UNUSED 0
1097 #define T_SHORT 1
1098 #define T_U_SHORT 2
1099 #define TP_SHORT 3
1100 #define T_INT 4
1101 #define T_U_INT 5
1102 #define TP_INT 6
1103 #define T_LONG 7
1104 #define T_U_LONG 8
1105 #define TP_LONG 9
1106 #define T_LLONG 10
1107 #define T_U_LLONG 11
1108 #define TP_LLONG 12
1109 #define T_DOUBLE 13
1110 #define T_LONG_DOUBLE 14
1111 #define TP_CHAR 15
1112 #define TP_VOID 16
1113 #define T_PTRINT 17
1114 #define TP_PTRINT 18
1115 #define T_SIZEINT 19
1116 #define T_SSIZEINT 20
1117 #define TP_SSIZEINT 21
1118 #define T_MAXINT 22
1119 #define T_MAXUINT 23
1120 #define TP_MAXINT 24
1121 #define T_CHAR 25
1122 #define T_U_CHAR 26
1123 #define T_WINT 27
1124 #define TP_WCHAR 28
1126 /*
1127 * Find all arguments when a positional parameter is encountered. Returns a
1128 * table, indexed by argument number, of pointers to each arguments. The
1129 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
1130 * It will be replaced with a mmap-ed one if it overflows (malloc cannot be
1131 * used since we are attempting to make snprintf thread safe, and alloca is
1132 * problematic since we have nested functions..)
1133 */
1134 static int
1135 __find_arguments(const char *fmt0, va_list ap, union arg **argtable,
1136 size_t *argtablesiz)
1137 {
1138 char *fmt; /* format string */
1139 int ch; /* character from fmt */
1140 int n, n2; /* handy integer (short term usage) */
1141 char *cp; /* handy char pointer (short term usage) */
1142 int flags; /* flags as above */
1143 unsigned char *typetable; /* table of types */
1144 unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
1145 int tablesize; /* current size of type table */
1146 int tablemax; /* largest used index in table */
1147 int nextarg; /* 1-based argument index */
1148 int ret = 0; /* return value */
1149 wchar_t wc;
1150 mbstate_t ps;
1152 /*
1153 * Add an argument type to the table, expanding if necessary.
1154 */
1155 #define ADDTYPE(type) \
1156 ((nextarg >= tablesize) ? \
1157 __grow_type_table(&typetable, &tablesize) : 0, \
1158 (nextarg > tablemax) ? tablemax = nextarg : 0, \
1159 typetable[nextarg++] = type)
1161 #define ADDSARG() \
1162 ((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \
1163 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
1164 ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \
1165 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \
1166 ((flags&LONGINT) ? ADDTYPE(T_LONG) : \
1167 ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : \
1168 ((flags&CHARINT) ? ADDTYPE(T_CHAR) : ADDTYPE(T_INT))))))))
1170 #define ADDUARG() \
1171 ((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \
1172 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
1173 ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \
1174 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \
1175 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
1176 ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : \
1177 ((flags&CHARINT) ? ADDTYPE(T_U_CHAR) : ADDTYPE(T_U_INT))))))))
1179 /*
1180 * Add * arguments to the type array.
1181 */
1182 #define ADDASTER() \
1183 n2 = 0; \
1184 cp = fmt; \
1185 while (is_digit(*cp)) { \
1186 APPEND_DIGIT(n2, *cp); \
1187 cp++; \
1188 } \
1189 if (*cp == '$') { \
1190 int hold = nextarg; \
1191 nextarg = n2; \
1192 ADDTYPE(T_INT); \
1193 nextarg = hold; \
1194 fmt = ++cp; \
1195 } else { \
1196 ADDTYPE(T_INT); \
1197 }
1198 fmt = (char *)fmt0;
1199 typetable = stattypetable;
1200 tablesize = STATIC_ARG_TBL_SIZE;
1201 tablemax = 0;
1202 nextarg = 1;
1203 memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
1204 memset(&ps, 0, sizeof(ps));
1206 /*
1207 * Scan the format for conversions (`%' character).
1208 */
1209 for (;;) {
1210 cp = fmt;
1211 while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) {
1212 fmt += n;
1213 if (wc == '%') {
1214 fmt--;
1215 break;
1216 }
1217 }
1218 if (n <= 0)
1219 goto done;
1220 fmt++; /* skip over '%' */
1222 flags = 0;
1224 rflag: ch = *fmt++;
1225 reswitch: switch (ch) {
1226 case ' ':
1227 case '#':
1228 case '\'':
1229 goto rflag;
1230 case '*':
1231 ADDASTER();
1232 goto rflag;
1233 case '-':
1234 case '+':
1235 goto rflag;
1236 case '.':
1237 if ((ch = *fmt++) == '*') {
1238 ADDASTER();
1239 goto rflag;
1240 }
1241 while (is_digit(ch)) {
1242 ch = *fmt++;
1243 }
1244 goto reswitch;
1245 case '0':
1246 goto rflag;
1247 case '1': case '2': case '3': case '4':
1248 case '5': case '6': case '7': case '8': case '9':
1249 n = 0;
1250 do {
1251 APPEND_DIGIT(n ,ch);
1252 ch = *fmt++;
1253 } while (is_digit(ch));
1254 if (ch == '$') {
1255 nextarg = n;
1256 goto rflag;
1257 }
1258 goto reswitch;
1259 #ifdef FLOATING_POINT
1260 case 'L':
1261 flags |= LONGDBL;
1262 goto rflag;
1263 #endif
1264 case 'h':
1265 if (*fmt == 'h') {
1266 fmt++;
1267 flags |= CHARINT;
1268 } else {
1269 flags |= SHORTINT;
1270 }
1271 goto rflag;
1272 case 'j':
1273 flags |= MAXINT;
1274 goto rflag;
1275 case 'l':
1276 if (*fmt == 'l') {
1277 fmt++;
1278 flags |= LLONGINT;
1279 } else {
1280 flags |= LONGINT;
1281 }
1282 goto rflag;
1283 case 'q':
1284 flags |= LLONGINT;
1285 goto rflag;
1286 case 't':
1287 flags |= PTRINT;
1288 goto rflag;
1289 case 'z':
1290 flags |= SIZEINT;
1291 goto rflag;
1292 case 'c':
1293 #ifdef PRINTF_WIDE_CHAR
1294 if (flags & LONGINT)
1295 ADDTYPE(T_WINT);
1296 else
1297 #endif
1298 ADDTYPE(T_INT);
1299 break;
1300 case 'D':
1301 flags |= LONGINT;
1302 /*FALLTHROUGH*/
1303 case 'd':
1304 case 'i':
1305 ADDSARG();
1306 break;
1307 #ifdef FLOATING_POINT
1308 case 'a':
1309 case 'A':
1310 case 'e':
1311 case 'E':
1312 case 'f':
1313 case 'F':
1314 case 'g':
1315 case 'G':
1316 if (flags & LONGDBL)
1317 ADDTYPE(T_LONG_DOUBLE);
1318 else
1319 ADDTYPE(T_DOUBLE);
1320 break;
1321 #endif /* FLOATING_POINT */
1322 #ifndef NO_PRINTF_PERCENT_N
1323 case 'n':
1324 if (flags & LLONGINT)
1325 ADDTYPE(TP_LLONG);
1326 else if (flags & LONGINT)
1327 ADDTYPE(TP_LONG);
1328 else if (flags & SHORTINT)
1329 ADDTYPE(TP_SHORT);
1330 else if (flags & PTRINT)
1331 ADDTYPE(TP_PTRINT);
1332 else if (flags & SIZEINT)
1333 ADDTYPE(TP_SSIZEINT);
1334 else if (flags & MAXINT)
1335 ADDTYPE(TP_MAXINT);
1336 else
1337 ADDTYPE(TP_INT);
1338 continue; /* no output */
1339 #endif /* NO_PRINTF_PERCENT_N */
1340 case 'O':
1341 flags |= LONGINT;
1342 /*FALLTHROUGH*/
1343 case 'o':
1344 ADDUARG();
1345 break;
1346 case 'p':
1347 ADDTYPE(TP_VOID);
1348 break;
1349 case 's':
1350 #ifdef PRINTF_WIDE_CHAR
1351 if (flags & LONGINT)
1352 ADDTYPE(TP_WCHAR);
1353 else
1354 #endif
1355 ADDTYPE(TP_CHAR);
1356 break;
1357 case 'U':
1358 flags |= LONGINT;
1359 /*FALLTHROUGH*/
1360 case 'u':
1361 case 'X':
1362 case 'x':
1363 ADDUARG();
1364 break;
1365 default: /* "%?" prints ?, unless ? is NUL */
1366 if (ch == '\0')
1367 goto done;
1368 break;
1369 }
1370 }
1371 done:
1372 /*
1373 * Build the argument table.
1374 */
1375 if (tablemax >= STATIC_ARG_TBL_SIZE) {
1376 *argtablesiz = sizeof(union arg) * (tablemax + 1);
1377 *argtable = mmap(NULL, *argtablesiz,
1378 PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0);
1379 if (*argtable == MAP_FAILED)
1380 return (-1);
1381 }
1383 #if 0
1384 /* XXX is this required? */
1385 (*argtable)[0].intarg = 0;
1386 #endif
1387 for (n = 1; n <= tablemax; n++) {
1388 switch (typetable[n]) {
1389 case T_UNUSED:
1390 case T_CHAR:
1391 case T_U_CHAR:
1392 case T_SHORT:
1393 case T_U_SHORT:
1394 case T_INT:
1395 (*argtable)[n].intarg = va_arg(ap, int);
1396 break;
1397 case TP_SHORT:
1398 (*argtable)[n].pshortarg = va_arg(ap, short *);
1399 break;
1400 case T_U_INT:
1401 (*argtable)[n].uintarg = va_arg(ap, unsigned int);
1402 break;
1403 case TP_INT:
1404 (*argtable)[n].pintarg = va_arg(ap, int *);
1405 break;
1406 case T_LONG:
1407 (*argtable)[n].longarg = va_arg(ap, long);
1408 break;
1409 case T_U_LONG:
1410 (*argtable)[n].ulongarg = va_arg(ap, unsigned long);
1411 break;
1412 case TP_LONG:
1413 (*argtable)[n].plongarg = va_arg(ap, long *);
1414 break;
1415 case T_LLONG:
1416 (*argtable)[n].longlongarg = va_arg(ap, long long);
1417 break;
1418 case T_U_LLONG:
1419 (*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long);
1420 break;
1421 case TP_LLONG:
1422 (*argtable)[n].plonglongarg = va_arg(ap, long long *);
1423 break;
1424 #ifdef FLOATING_POINT
1425 case T_DOUBLE:
1426 (*argtable)[n].doublearg = va_arg(ap, double);
1427 break;
1428 case T_LONG_DOUBLE:
1429 (*argtable)[n].longdoublearg = va_arg(ap, long double);
1430 break;
1431 #endif
1432 case TP_CHAR:
1433 (*argtable)[n].pchararg = va_arg(ap, char *);
1434 break;
1435 case TP_VOID:
1436 (*argtable)[n].pvoidarg = va_arg(ap, void *);
1437 break;
1438 case T_PTRINT:
1439 (*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t);
1440 break;
1441 case TP_PTRINT:
1442 (*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t *);
1443 break;
1444 case T_SIZEINT:
1445 (*argtable)[n].sizearg = va_arg(ap, size_t);
1446 break;
1447 case T_SSIZEINT:
1448 (*argtable)[n].ssizearg = va_arg(ap, ssize_t);
1449 break;
1450 case TP_SSIZEINT:
1451 (*argtable)[n].pssizearg = va_arg(ap, ssize_t *);
1452 break;
1453 case T_MAXINT:
1454 (*argtable)[n].intmaxarg = va_arg(ap, intmax_t);
1455 break;
1456 case T_MAXUINT:
1457 (*argtable)[n].uintmaxarg = va_arg(ap, uintmax_t);
1458 break;
1459 case TP_MAXINT:
1460 (*argtable)[n].pintmaxarg = va_arg(ap, intmax_t *);
1461 break;
1462 #ifdef PRINTF_WIDE_CHAR
1463 case T_WINT:
1464 (*argtable)[n].wintarg = va_arg(ap, wint_t);
1465 break;
1466 case TP_WCHAR:
1467 (*argtable)[n].pwchararg = va_arg(ap, wchar_t *);
1468 break;
1469 #endif
1470 }
1471 }
1472 goto finish;
1474 overflow:
1475 errno = ENOMEM;
1476 ret = -1;
1478 finish:
1479 if (typetable != NULL && typetable != stattypetable) {
1480 munmap(typetable, *argtablesiz);
1481 typetable = NULL;
1482 }
1483 return (ret);
1484 }
1486 /*
1487 * Increase the size of the type table.
1488 */
1489 static int
1490 __grow_type_table(unsigned char **typetable, int *tablesize)
1491 {
1492 unsigned char *oldtable = *typetable;
1493 int newsize = *tablesize * 2;
1495 if (newsize < getpagesize())
1496 newsize = getpagesize();
1498 if (*tablesize == STATIC_ARG_TBL_SIZE) {
1499 *typetable = mmap(NULL, newsize, PROT_WRITE|PROT_READ,
1500 MAP_ANON|MAP_PRIVATE, -1, 0);
1501 if (*typetable == MAP_FAILED)
1502 return (-1);
1503 bcopy(oldtable, *typetable, *tablesize);
1504 } else {
1505 unsigned char *new = mmap(NULL, newsize, PROT_WRITE|PROT_READ,
1506 MAP_ANON|MAP_PRIVATE, -1, 0);
1507 if (new == MAP_FAILED)
1508 return (-1);
1509 memmove(new, *typetable, *tablesize);
1510 munmap(*typetable, *tablesize);
1511 *typetable = new;
1512 }
1513 memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize));
1515 *tablesize = newsize;
1516 return (0);
1517 }
1520 #ifdef FLOATING_POINT
1521 static int
1522 exponent(char *p0, int exp, int fmtch)
1523 {
1524 char *p, *t;
1525 char expbuf[MAXEXPDIG];
1527 p = p0;
1528 *p++ = fmtch;
1529 if (exp < 0) {
1530 exp = -exp;
1531 *p++ = '-';
1532 } else
1533 *p++ = '+';
1534 t = expbuf + MAXEXPDIG;
1535 if (exp > 9) {
1536 do {
1537 *--t = to_char(exp % 10);
1538 } while ((exp /= 10) > 9);
1539 *--t = to_char(exp);
1540 for (; t < expbuf + MAXEXPDIG; *p++ = *t++)
1541 /* nothing */;
1542 } else {
1543 /*
1544 * Exponents for decimal floating point conversions
1545 * (%[eEgG]) must be at least two characters long,
1546 * whereas exponents for hexadecimal conversions can
1547 * be only one character long.
1548 */
1549 if (fmtch == 'e' || fmtch == 'E')
1550 *p++ = '0';
1551 *p++ = to_char(exp);
1552 }
1553 return (p - p0);
1554 }
1555 #endif /* FLOATING_POINT */