1 /* $OpenBSD: vfprintf.c,v 1.83 2024/07/14 13:31:50 millert 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 */
33
34 /*
35 * Actual printf innards.
36 *
37 * This code is large and complicated...
38 */
39
40 #include <sys/types.h>
41 #include <sys/mman.h>
42
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 <syslog.h>
54 #include <wchar.h>
55
56 #include "local.h"
57 #include "fvwrite.h"
58
59 #define PRINTF_PAGESIZE (1 << _MAX_PAGE_SHIFT)
60 #define PRINTF_PAGEMASK (PRINTF_PAGESIZE - 1)
61 #define PAGEROUND(x) (((x) + (PRINTF_PAGEMASK)) & ~PRINTF_PAGEMASK)
62
63 union arg {
64 int intarg;
65 unsigned int uintarg;
66 long longarg;
67 unsigned long ulongarg;
68 long long longlongarg;
69 unsigned long long ulonglongarg;
70 ptrdiff_t ptrdiffarg;
71 size_t sizearg;
72 ssize_t ssizearg;
73 intmax_t intmaxarg;
74 uintmax_t uintmaxarg;
75 void *pvoidarg;
76 char *pchararg;
77 signed char *pschararg;
78 short *pshortarg;
79 int *pintarg;
80 long *plongarg;
81 long long *plonglongarg;
82 ptrdiff_t *pptrdiffarg;
83 ssize_t *pssizearg;
84 intmax_t *pintmaxarg;
85 #ifdef FLOATING_POINT
86 double doublearg;
87 long double longdoublearg;
88 #endif
89 #ifdef PRINTF_WIDE_CHAR
90 wint_t wintarg;
91 wchar_t *pwchararg;
92 #endif
93 };
94
95 static int __find_arguments(const char *fmt0, va_list ap, union arg **argtable,
96 size_t *argtablesiz);
97 static int __grow_type_table(unsigned char **typetable, int *tablesize);
98
99 /*
100 * Flush out all the vectors defined by the given uio,
101 * then reset it so that it can be reused.
102 */
103 static int
__sprint(FILE * fp,struct __suio * uio)104 __sprint(FILE *fp, struct __suio *uio)
105 {
106 int err;
107
108 if (uio->uio_resid == 0) {
109 uio->uio_iovcnt = 0;
110 return (0);
111 }
112 err = __sfvwrite(fp, uio);
113 uio->uio_resid = 0;
114 uio->uio_iovcnt = 0;
115 return (err);
116 }
117
118 /*
119 * Helper function for `fprintf to unbuffered unix file': creates a
120 * temporary buffer. We only work on write-only files; this avoids
121 * worries about ungetc buffers and so forth.
122 */
123 static int
__sbprintf(FILE * fp,const char * fmt,va_list ap)124 __sbprintf(FILE *fp, const char *fmt, va_list ap)
125 {
126 int ret;
127 FILE fake;
128 struct __sfileext fakeext;
129 unsigned char buf[BUFSIZ];
130
131 _FILEEXT_SETUP(&fake, &fakeext);
132 /* copy the important variables */
133 fake._flags = fp->_flags & ~__SNBF;
134 fake._file = fp->_file;
135 fake._cookie = fp->_cookie;
136 fake._write = fp->_write;
137
138 /* set up the buffer */
139 fake._bf._base = fake._p = buf;
140 fake._bf._size = fake._w = sizeof(buf);
141 fake._lbfsize = 0; /* not actually used, but Just In Case */
142
143 /* do the work, then copy any error status */
144 ret = __vfprintf(&fake, fmt, ap);
145 if (ret >= 0 && __sflush(&fake))
146 ret = EOF;
147 if (fake._flags & __SERR)
148 fp->_flags |= __SERR;
149 return (ret);
150 }
151
152 #ifdef PRINTF_WIDE_CHAR
153 /*
154 * Convert a wide character string argument for the %ls format to a multibyte
155 * string representation. If not -1, prec specifies the maximum number of
156 * bytes to output, and also means that we can't assume that the wide char
157 * string is null-terminated.
158 */
159 static char *
__wcsconv(wchar_t * wcsarg,int prec,char ** convbufp,size_t * convbufsizp)160 __wcsconv(wchar_t *wcsarg, int prec, char **convbufp, size_t *convbufsizp)
161 {
162 char *convbuf = *convbufp;
163 size_t convbufsiz = *convbufsizp;
164 mbstate_t mbs;
165 char buf[MB_LEN_MAX];
166 wchar_t *p;
167 size_t clen, nbytes;
168
169 /* Allocate space for the maximum number of bytes we could output. */
170 if (prec < 0) {
171 memset(&mbs, 0, sizeof(mbs));
172 p = wcsarg;
173 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs);
174 if (nbytes == (size_t)-1)
175 return (NULL);
176 } else {
177 /*
178 * Optimisation: if the output precision is small enough,
179 * just allocate enough memory for the maximum instead of
180 * scanning the string.
181 */
182 if (prec < 128)
183 nbytes = prec;
184 else {
185 nbytes = 0;
186 p = wcsarg;
187 memset(&mbs, 0, sizeof(mbs));
188 for (;;) {
189 clen = wcrtomb(buf, *p++, &mbs);
190 if (clen == 0 || clen == (size_t)-1 ||
191 nbytes + clen > (size_t)prec)
192 break;
193 nbytes += clen;
194 }
195 if (clen == (size_t)-1)
196 return (NULL);
197 }
198 }
199 if (nbytes + 1 > convbufsiz) {
200 if (convbuf != NULL)
201 munmap(convbuf, convbufsiz);
202 convbufsiz = PAGEROUND(nbytes + 1);
203 convbuf = mmap(NULL, convbufsiz, PROT_WRITE|PROT_READ,
204 MAP_ANON|MAP_PRIVATE, -1, 0);
205 if (convbuf == MAP_FAILED) {
206 *convbufp = NULL;
207 *convbufsizp = 0;
208 return (NULL);
209 }
210 *convbufp = convbuf;
211 *convbufsizp = convbufsiz;
212 }
213
214 /* Fill the output buffer. */
215 p = wcsarg;
216 memset(&mbs, 0, sizeof(mbs));
217 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p,
218 nbytes, &mbs)) == (size_t)-1) {
219 return (NULL);
220 }
221 convbuf[nbytes] = '\0';
222 return (convbuf);
223 }
224 #endif
225
226 #ifdef FLOATING_POINT
227 #include <float.h>
228 #include <locale.h>
229 #include <math.h>
230 #include "floatio.h"
231 #include "gdtoa.h"
232
233 #define DEFPREC 6
234
235 static int exponent(char *, int, int);
236 #endif /* FLOATING_POINT */
237
238 /*
239 * The size of the buffer we use as scratch space for integer
240 * conversions, among other things. Technically, we would need the
241 * most space for base 10 conversions with thousands' grouping
242 * characters between each pair of digits. 100 bytes is a
243 * conservative overestimate even for a 128-bit uintmax_t.
244 */
245 #define BUF 100
246
247 #define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
248
249
250 /*
251 * Macros for converting digits to letters and vice versa
252 */
253 #define to_digit(c) ((c) - '0')
254 #define is_digit(c) ((unsigned)to_digit(c) <= 9)
255 #define to_char(n) ((n) + '0')
256
257 /*
258 * Flags used during conversion.
259 */
260 #define ALT 0x0001 /* alternate form */
261 #define LADJUST 0x0004 /* left adjustment */
262 #define LONGDBL 0x0008 /* long double */
263 #define LONGINT 0x0010 /* long integer */
264 #define LLONGINT 0x0020 /* long long integer */
265 #define SHORTINT 0x0040 /* short integer */
266 #define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */
267 #define FPT 0x0100 /* Floating point number */
268 #define PTRINT 0x0200 /* (unsigned) ptrdiff_t */
269 #define SIZEINT 0x0400 /* (signed) size_t */
270 #define CHARINT 0x0800 /* 8 bit integer */
271 #define MAXINT 0x1000 /* largest integer size (intmax_t) */
272
273 int
vfprintf(FILE * fp,const char * fmt0,__va_list ap)274 vfprintf(FILE *fp, const char *fmt0, __va_list ap)
275 {
276 int ret;
277
278 FLOCKFILE(fp);
279 ret = __vfprintf(fp, fmt0, ap);
280 FUNLOCKFILE(fp);
281 return (ret);
282 }
283 DEF_STRONG(vfprintf);
284
285 int
__vfprintf(FILE * fp,const char * fmt0,__va_list ap)286 __vfprintf(FILE *fp, const char *fmt0, __va_list ap)
287 {
288 char *fmt; /* format string */
289 int ch; /* character from fmt */
290 int n, n2; /* handy integers (short term usage) */
291 char *cp; /* handy char pointer (short term usage) */
292 struct __siov *iovp; /* for PRINT macro */
293 int flags; /* flags as above */
294 int ret; /* return value accumulator */
295 int width; /* width from format (%8d), or 0 */
296 int prec; /* precision from format; <0 for N/A */
297 char sign; /* sign prefix (' ', '+', '-', or \0) */
298 #ifdef FLOATING_POINT
299 /*
300 * We can decompose the printed representation of floating
301 * point numbers into several parts, some of which may be empty:
302 *
303 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ
304 * A B ---C--- D E F
305 *
306 * A: 'sign' holds this value if present; '\0' otherwise
307 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal
308 * C: cp points to the string MMMNNN. Leading and trailing
309 * zeros are not in the string and must be added.
310 * D: expchar holds this character; '\0' if no exponent, e.g. %f
311 * F: at least two digits for decimal, at least one digit for hex
312 */
313 char *decimal_point = NULL;
314 int signflag; /* true if float is negative */
315 union { /* floating point arguments %[aAeEfFgG] */
316 double dbl;
317 long double ldbl;
318 } fparg;
319 int expt; /* integer value of exponent */
320 char expchar; /* exponent character: [eEpP\0] */
321 char *dtoaend; /* pointer to end of converted digits */
322 int expsize; /* character count for expstr */
323 int lead; /* sig figs before decimal or group sep */
324 int ndig; /* actual number of digits returned by dtoa */
325 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */
326 char *dtoaresult = NULL;
327 #endif
328
329 uintmax_t _umax; /* integer arguments %[diouxX] */
330 enum { OCT, DEC, HEX } base; /* base for %[diouxX] conversion */
331 int dprec; /* a copy of prec if %[diouxX], 0 otherwise */
332 int realsz; /* field size expanded by dprec */
333 int size; /* size of converted field or string */
334 const char *xdigs; /* digits for %[xX] conversion */
335 #define NIOV 8
336 struct __suio uio; /* output information: summary */
337 struct __siov iov[NIOV];/* ... and individual io vectors */
338 char buf[BUF]; /* buffer with space for digits of uintmax_t */
339 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */
340 union arg *argtable; /* args, built due to positional arg */
341 union arg statargtable[STATIC_ARG_TBL_SIZE];
342 size_t argtablesiz;
343 int nextarg; /* 1-based argument index */
344 va_list orgap; /* original argument pointer */
345 #ifdef PRINTF_WIDE_CHAR
346 char *convbuf; /* buffer for wide to multi-byte conversion */
347 size_t convbufsiz; /* size of convbuf, for munmap() */
348 #endif
349
350 /*
351 * Choose PADSIZE to trade efficiency vs. size. If larger printf
352 * fields occur frequently, increase PADSIZE and make the initialisers
353 * below longer.
354 */
355 #define PADSIZE 16 /* pad chunk size */
356 static char blanks[PADSIZE] =
357 {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
358 static char zeroes[PADSIZE] =
359 {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
360
361 static const char xdigs_lower[16] = "0123456789abcdef";
362 static const char xdigs_upper[16] = "0123456789ABCDEF";
363
364 /*
365 * BEWARE, these `goto error' on error, and PAD uses `n'.
366 */
367 #define PRINT(ptr, len) do { \
368 iovp->iov_base = (ptr); \
369 iovp->iov_len = (len); \
370 uio.uio_resid += (len); \
371 iovp++; \
372 if (++uio.uio_iovcnt >= NIOV) { \
373 if (__sprint(fp, &uio)) \
374 goto error; \
375 iovp = iov; \
376 } \
377 } while (0)
378 #define PAD(howmany, with) do { \
379 if ((n = (howmany)) > 0) { \
380 while (n > PADSIZE) { \
381 PRINT(with, PADSIZE); \
382 n -= PADSIZE; \
383 } \
384 PRINT(with, n); \
385 } \
386 } while (0)
387 #define PRINTANDPAD(p, ep, len, with) do { \
388 n2 = (ep) - (p); \
389 if (n2 > (len)) \
390 n2 = (len); \
391 if (n2 > 0) \
392 PRINT((p), n2); \
393 PAD((len) - (n2 > 0 ? n2 : 0), (with)); \
394 } while(0)
395 #define FLUSH() do { \
396 if (uio.uio_resid && __sprint(fp, &uio)) \
397 goto error; \
398 uio.uio_iovcnt = 0; \
399 iovp = iov; \
400 } while (0)
401
402 /*
403 * To extend shorts properly, we need both signed and unsigned
404 * argument extraction methods.
405 */
406 #define SARG() \
407 ((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \
408 flags&LLONGINT ? GETARG(long long) : \
409 flags&LONGINT ? GETARG(long) : \
410 flags&PTRINT ? GETARG(ptrdiff_t) : \
411 flags&SIZEINT ? GETARG(ssize_t) : \
412 flags&SHORTINT ? (short)GETARG(int) : \
413 flags&CHARINT ? (signed char)GETARG(int) : \
414 GETARG(int)))
415 #define UARG() \
416 ((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \
417 flags&LLONGINT ? GETARG(unsigned long long) : \
418 flags&LONGINT ? GETARG(unsigned long) : \
419 flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \
420 flags&SIZEINT ? GETARG(size_t) : \
421 flags&SHORTINT ? (unsigned short)GETARG(int) : \
422 flags&CHARINT ? (unsigned char)GETARG(int) : \
423 GETARG(unsigned int)))
424
425 /*
426 * Append a digit to a value and check for overflow.
427 */
428 #define APPEND_DIGIT(val, dig) do { \
429 if ((val) > INT_MAX / 10) \
430 goto overflow; \
431 (val) *= 10; \
432 if ((val) > INT_MAX - to_digit((dig))) \
433 goto overflow; \
434 (val) += to_digit((dig)); \
435 } while (0)
436
437 /*
438 * Get * arguments, including the form *nn$. Preserve the nextarg
439 * that the argument can be gotten once the type is determined.
440 */
441 #define GETASTER(val) \
442 n2 = 0; \
443 cp = fmt; \
444 while (is_digit(*cp)) { \
445 APPEND_DIGIT(n2, *cp); \
446 cp++; \
447 } \
448 if (*cp == '$') { \
449 int hold = nextarg; \
450 if (argtable == NULL) { \
451 argtable = statargtable; \
452 if (__find_arguments(fmt0, orgap, &argtable, \
453 &argtablesiz) == -1) { \
454 ret = -1; \
455 goto error; \
456 } \
457 } \
458 nextarg = n2; \
459 val = GETARG(int); \
460 nextarg = hold; \
461 fmt = ++cp; \
462 } else { \
463 val = GETARG(int); \
464 }
465
466 /*
467 * Get the argument indexed by nextarg. If the argument table is
468 * built, use it to get the argument. If its not, get the next
469 * argument (and arguments must be gotten sequentially).
470 */
471 #define GETARG(type) \
472 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \
473 (nextarg++, va_arg(ap, type)))
474
475 _SET_ORIENTATION(fp, -1);
476 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
477 if (cantwrite(fp))
478 return (EOF);
479
480 /* optimise fprintf(stderr) (and other unbuffered Unix files) */
481 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
482 fp->_file >= 0)
483 return (__sbprintf(fp, fmt0, ap));
484
485 fmt = (char *)fmt0;
486 argtable = NULL;
487 nextarg = 1;
488 va_copy(orgap, ap);
489 uio.uio_iov = iovp = iov;
490 uio.uio_resid = 0;
491 uio.uio_iovcnt = 0;
492 ret = 0;
493 #ifdef PRINTF_WIDE_CHAR
494 convbuf = NULL;
495 convbufsiz = 0;
496 #endif
497
498 /*
499 * Scan the format for conversions (`%' character).
500 */
501 for (;;) {
502 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
503 continue;
504
505 if (fmt != cp) {
506 ptrdiff_t m = fmt - cp;
507 if (m < 0 || m > INT_MAX - ret)
508 goto overflow;
509 PRINT(cp, m);
510 ret += m;
511 }
512 if (ch == '\0')
513 goto done;
514 fmt++; /* skip over '%' */
515
516 flags = 0;
517 dprec = 0;
518 width = 0;
519 prec = -1;
520 sign = '\0';
521 ox[1] = '\0';
522
523 rflag: ch = *fmt++;
524 reswitch: switch (ch) {
525 case ' ':
526 /*
527 * ``If the space and + flags both appear, the space
528 * flag will be ignored.''
529 * -- ANSI X3J11
530 */
531 if (!sign)
532 sign = ' ';
533 goto rflag;
534 case '#':
535 flags |= ALT;
536 goto rflag;
537 case '\'':
538 /* grouping not implemented */
539 goto rflag;
540 case '*':
541 /*
542 * ``A negative field width argument is taken as a
543 * - flag followed by a positive field width.''
544 * -- ANSI X3J11
545 * They don't exclude field widths read from args.
546 */
547 GETASTER(width);
548 if (width >= 0)
549 goto rflag;
550 if (width == INT_MIN)
551 goto overflow;
552 width = -width;
553 /* FALLTHROUGH */
554 case '-':
555 flags |= LADJUST;
556 goto rflag;
557 case '+':
558 sign = '+';
559 goto rflag;
560 case '.':
561 if ((ch = *fmt++) == '*') {
562 GETASTER(n);
563 prec = n < 0 ? -1 : n;
564 goto rflag;
565 }
566 n = 0;
567 while (is_digit(ch)) {
568 APPEND_DIGIT(n, ch);
569 ch = *fmt++;
570 }
571 if (ch == '$') {
572 nextarg = n;
573 if (argtable == NULL) {
574 argtable = statargtable;
575 if (__find_arguments(fmt0, orgap,
576 &argtable, &argtablesiz) == -1) {
577 ret = -1;
578 goto error;
579 }
580 }
581 goto rflag;
582 }
583 prec = n;
584 goto reswitch;
585 case '0':
586 /*
587 * ``Note that 0 is taken as a flag, not as the
588 * beginning of a field width.''
589 * -- ANSI X3J11
590 */
591 flags |= ZEROPAD;
592 goto rflag;
593 case '1': case '2': case '3': case '4':
594 case '5': case '6': case '7': case '8': case '9':
595 n = 0;
596 do {
597 APPEND_DIGIT(n, ch);
598 ch = *fmt++;
599 } while (is_digit(ch));
600 if (ch == '$') {
601 nextarg = n;
602 if (argtable == NULL) {
603 argtable = statargtable;
604 if (__find_arguments(fmt0, orgap,
605 &argtable, &argtablesiz) == -1) {
606 ret = -1;
607 goto error;
608 }
609 }
610 goto rflag;
611 }
612 width = n;
613 goto reswitch;
614 #ifdef FLOATING_POINT
615 case 'L':
616 flags |= LONGDBL;
617 goto rflag;
618 #endif
619 case 'h':
620 if (*fmt == 'h') {
621 fmt++;
622 flags |= CHARINT;
623 } else {
624 flags |= SHORTINT;
625 }
626 goto rflag;
627 case 'j':
628 flags |= MAXINT;
629 goto rflag;
630 case 'l':
631 if (*fmt == 'l') {
632 fmt++;
633 flags |= LLONGINT;
634 } else {
635 flags |= LONGINT;
636 }
637 goto rflag;
638 case 'q':
639 flags |= LLONGINT;
640 goto rflag;
641 case 't':
642 flags |= PTRINT;
643 goto rflag;
644 case 'z':
645 flags |= SIZEINT;
646 goto rflag;
647 case 'c':
648 #ifdef PRINTF_WIDE_CHAR
649 if (flags & LONGINT) {
650 mbstate_t mbs;
651 size_t mbseqlen;
652
653 memset(&mbs, 0, sizeof(mbs));
654 mbseqlen = wcrtomb(buf,
655 (wchar_t)GETARG(wint_t), &mbs);
656 if (mbseqlen == (size_t)-1) {
657 ret = -1;
658 goto error;
659 }
660 cp = buf;
661 size = (int)mbseqlen;
662 } else {
663 #endif
664 *(cp = buf) = GETARG(int);
665 size = 1;
666 #ifdef PRINTF_WIDE_CHAR
667 }
668 #endif
669 sign = '\0';
670 break;
671 case 'D':
672 flags |= LONGINT;
673 /*FALLTHROUGH*/
674 case 'd':
675 case 'i':
676 _umax = SARG();
677 if ((intmax_t)_umax < 0) {
678 _umax = -_umax;
679 sign = '-';
680 }
681 base = DEC;
682 goto number;
683 #ifdef FLOATING_POINT
684 case 'a':
685 case 'A':
686 if (ch == 'a') {
687 ox[1] = 'x';
688 xdigs = xdigs_lower;
689 expchar = 'p';
690 } else {
691 ox[1] = 'X';
692 xdigs = xdigs_upper;
693 expchar = 'P';
694 }
695 if (prec >= 0)
696 prec++;
697 if (dtoaresult)
698 __freedtoa(dtoaresult);
699 if (flags & LONGDBL) {
700 fparg.ldbl = GETARG(long double);
701 dtoaresult = cp =
702 __hldtoa(fparg.ldbl, xdigs, prec,
703 &expt, &signflag, &dtoaend);
704 if (dtoaresult == NULL) {
705 errno = ENOMEM;
706 goto error;
707 }
708 } else {
709 fparg.dbl = GETARG(double);
710 dtoaresult = cp =
711 __hdtoa(fparg.dbl, xdigs, prec,
712 &expt, &signflag, &dtoaend);
713 if (dtoaresult == NULL) {
714 errno = ENOMEM;
715 goto error;
716 }
717 }
718 if (prec < 0)
719 prec = dtoaend - cp;
720 if (expt == INT_MAX)
721 ox[1] = '\0';
722 goto fp_common;
723 case 'e':
724 case 'E':
725 expchar = ch;
726 if (prec < 0) /* account for digit before decpt */
727 prec = DEFPREC + 1;
728 else
729 prec++;
730 goto fp_begin;
731 case 'f':
732 case 'F':
733 expchar = '\0';
734 goto fp_begin;
735 case 'g':
736 case 'G':
737 expchar = ch - ('g' - 'e');
738 if (prec == 0)
739 prec = 1;
740 fp_begin:
741 if (prec < 0)
742 prec = DEFPREC;
743 if (dtoaresult)
744 __freedtoa(dtoaresult);
745 if (flags & LONGDBL) {
746 fparg.ldbl = GETARG(long double);
747 dtoaresult = cp =
748 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
749 &expt, &signflag, &dtoaend);
750 if (dtoaresult == NULL) {
751 errno = ENOMEM;
752 goto error;
753 }
754 } else {
755 fparg.dbl = GETARG(double);
756 dtoaresult = cp =
757 __dtoa(fparg.dbl, expchar ? 2 : 3, prec,
758 &expt, &signflag, &dtoaend);
759 if (dtoaresult == NULL) {
760 errno = ENOMEM;
761 goto error;
762 }
763 if (expt == 9999)
764 expt = INT_MAX;
765 }
766 fp_common:
767 if (signflag)
768 sign = '-';
769 if (expt == INT_MAX) { /* inf or nan */
770 if (*cp == 'N')
771 cp = (ch >= 'a') ? "nan" : "NAN";
772 else
773 cp = (ch >= 'a') ? "inf" : "INF";
774 size = 3;
775 flags &= ~ZEROPAD;
776 break;
777 }
778 flags |= FPT;
779 ndig = dtoaend - cp;
780 if (ch == 'g' || ch == 'G') {
781 if (expt > -4 && expt <= prec) {
782 /* Make %[gG] smell like %[fF] */
783 expchar = '\0';
784 if (flags & ALT)
785 prec -= expt;
786 else
787 prec = ndig - expt;
788 if (prec < 0)
789 prec = 0;
790 } else {
791 /*
792 * Make %[gG] smell like %[eE], but
793 * trim trailing zeroes if no # flag.
794 */
795 if (!(flags & ALT))
796 prec = ndig;
797 }
798 }
799 if (expchar) {
800 expsize = exponent(expstr, expt - 1, expchar);
801 size = expsize + prec;
802 if (prec > 1 || flags & ALT)
803 ++size;
804 } else {
805 /* space for digits before decimal point */
806 if (expt > 0)
807 size = expt;
808 else /* "0" */
809 size = 1;
810 /* space for decimal pt and following digits */
811 if (prec || flags & ALT)
812 size += prec + 1;
813 lead = expt;
814 }
815 break;
816 #endif /* FLOATING_POINT */
817 case 'n': {
818 static const char n_msg[] = ": *printf used %n, aborting: ";
819 char buf[1024], *p;
820
821 /* <10> is LOG_CRIT */
822 strlcpy(buf, "<10>", sizeof buf);
823
824 /* Make sure progname does not fill the whole buffer */
825 strlcat(buf, __progname, sizeof(buf) - sizeof n_msg);
826 strlcat(buf, n_msg, sizeof buf);
827 strlcat(buf, fmt0, sizeof buf);
828 if ((p = strchr(buf, '\n')))
829 *p = '\0';
830 sendsyslog(buf, strlen(buf), LOG_CONS);
831 abort();
832 break;
833 }
834 case 'O':
835 flags |= LONGINT;
836 /*FALLTHROUGH*/
837 case 'o':
838 _umax = UARG();
839 base = OCT;
840 goto nosign;
841 case 'p':
842 /*
843 * ``The argument shall be a pointer to void. The
844 * value of the pointer is converted to a sequence
845 * of printable characters, in an implementation-
846 * defined manner.''
847 * -- ANSI X3J11
848 */
849 _umax = (u_long)GETARG(void *);
850 base = HEX;
851 xdigs = xdigs_lower;
852 ox[1] = 'x';
853 goto nosign;
854 case 's': {
855 size_t len;
856
857 #ifdef PRINTF_WIDE_CHAR
858 if (flags & LONGINT) {
859 wchar_t *wcp;
860
861 if ((wcp = GETARG(wchar_t *)) == NULL) {
862 struct syslog_data sdata = SYSLOG_DATA_INIT;
863 int save_errno = errno;
864
865 syslog_r(LOG_CRIT | LOG_CONS, &sdata,
866 "vfprintf %%ls NULL in \"%s\"", fmt0);
867 errno = save_errno;
868
869 cp = "(null)";
870 } else {
871 cp = __wcsconv(wcp, prec, &convbuf,
872 &convbufsiz);
873 if (cp == NULL) {
874 ret = -1;
875 goto error;
876 }
877 }
878 } else
879 #endif /* PRINTF_WIDE_CHAR */
880
881 if ((cp = GETARG(char *)) == NULL) {
882 struct syslog_data sdata = SYSLOG_DATA_INIT;
883 int save_errno = errno;
884
885 syslog_r(LOG_CRIT | LOG_CONS, &sdata,
886 "vfprintf %%s NULL in \"%s\"", fmt0);
887 errno = save_errno;
888
889 cp = "(null)";
890 }
891 len = prec >= 0 ? strnlen(cp, prec) : strlen(cp);
892 if (len > INT_MAX)
893 goto overflow;
894 size = (int)len;
895 sign = '\0';
896 }
897 break;
898 case 'U':
899 flags |= LONGINT;
900 /*FALLTHROUGH*/
901 case 'u':
902 _umax = UARG();
903 base = DEC;
904 goto nosign;
905 case 'X':
906 xdigs = xdigs_upper;
907 goto hex;
908 case 'x':
909 xdigs = xdigs_lower;
910 hex: _umax = UARG();
911 base = HEX;
912 /* leading 0x/X only if non-zero */
913 if (flags & ALT && _umax != 0)
914 ox[1] = ch;
915
916 /* unsigned conversions */
917 nosign: sign = '\0';
918 /*
919 * ``... diouXx conversions ... if a precision is
920 * specified, the 0 flag will be ignored.''
921 * -- ANSI X3J11
922 */
923 number: if ((dprec = prec) >= 0)
924 flags &= ~ZEROPAD;
925
926 /*
927 * ``The result of converting a zero value with an
928 * explicit precision of zero is no characters.''
929 * -- ANSI X3J11
930 */
931 cp = buf + BUF;
932 if (_umax != 0 || prec != 0) {
933 /*
934 * Unsigned mod is hard, and unsigned mod
935 * by a constant is easier than that by
936 * a variable; hence this switch.
937 */
938 switch (base) {
939 case OCT:
940 do {
941 *--cp = to_char(_umax & 7);
942 _umax >>= 3;
943 } while (_umax);
944 /* handle octal leading 0 */
945 if (flags & ALT && *cp != '0')
946 *--cp = '0';
947 break;
948
949 case DEC:
950 /* many numbers are 1 digit */
951 while (_umax >= 10) {
952 *--cp = to_char(_umax % 10);
953 _umax /= 10;
954 }
955 *--cp = to_char(_umax);
956 break;
957
958 case HEX:
959 do {
960 *--cp = xdigs[_umax & 15];
961 _umax >>= 4;
962 } while (_umax);
963 break;
964
965 default:
966 cp = "bug in vfprintf: bad base";
967 size = strlen(cp);
968 goto skipsize;
969 }
970 }
971 size = buf + BUF - cp;
972 if (size > BUF) /* should never happen */
973 abort();
974 skipsize:
975 break;
976 default: /* "%?" prints ?, unless ? is NUL */
977 if (ch == '\0')
978 goto done;
979 /* pretend it was %c with argument ch */
980 cp = buf;
981 *cp = ch;
982 size = 1;
983 sign = '\0';
984 break;
985 }
986
987 /*
988 * All reasonable formats wind up here. At this point, `cp'
989 * points to a string which (if not flags&LADJUST) should be
990 * padded out to `width' places. If flags&ZEROPAD, it should
991 * first be prefixed by any sign or other prefix; otherwise,
992 * it should be blank padded before the prefix is emitted.
993 * After any left-hand padding and prefixing, emit zeroes
994 * required by a decimal %[diouxX] precision, then print the
995 * string proper, then emit zeroes required by any leftover
996 * floating precision; finally, if LADJUST, pad with blanks.
997 *
998 * Compute actual size, so we know how much to pad.
999 * size excludes decimal prec; realsz includes it.
1000 */
1001 realsz = dprec > size ? dprec : size;
1002 if (sign)
1003 realsz++;
1004 if (ox[1])
1005 realsz+= 2;
1006
1007 /* right-adjusting blank padding */
1008 if ((flags & (LADJUST|ZEROPAD)) == 0)
1009 PAD(width - realsz, blanks);
1010
1011 /* prefix */
1012 if (sign)
1013 PRINT(&sign, 1);
1014 if (ox[1]) { /* ox[1] is either x, X, or \0 */
1015 ox[0] = '0';
1016 PRINT(ox, 2);
1017 }
1018
1019 /* right-adjusting zero padding */
1020 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
1021 PAD(width - realsz, zeroes);
1022
1023 /* leading zeroes from decimal precision */
1024 PAD(dprec - size, zeroes);
1025
1026 /* the string or number proper */
1027 #ifdef FLOATING_POINT
1028 if ((flags & FPT) == 0) {
1029 PRINT(cp, size);
1030 } else { /* glue together f_p fragments */
1031 if (decimal_point == NULL)
1032 decimal_point = nl_langinfo(RADIXCHAR);
1033 if (!expchar) { /* %[fF] or sufficiently short %[gG] */
1034 if (expt <= 0) {
1035 PRINT(zeroes, 1);
1036 if (prec || flags & ALT)
1037 PRINT(decimal_point, 1);
1038 PAD(-expt, zeroes);
1039 /* already handled initial 0's */
1040 prec += expt;
1041 } else {
1042 PRINTANDPAD(cp, dtoaend, lead, zeroes);
1043 cp += lead;
1044 if (prec || flags & ALT)
1045 PRINT(decimal_point, 1);
1046 }
1047 PRINTANDPAD(cp, dtoaend, prec, zeroes);
1048 } else { /* %[eE] or sufficiently long %[gG] */
1049 if (prec > 1 || flags & ALT) {
1050 buf[0] = *cp++;
1051 buf[1] = *decimal_point;
1052 PRINT(buf, 2);
1053 PRINT(cp, ndig-1);
1054 PAD(prec - ndig, zeroes);
1055 } else { /* XeYYY */
1056 PRINT(cp, 1);
1057 }
1058 PRINT(expstr, expsize);
1059 }
1060 }
1061 #else
1062 PRINT(cp, size);
1063 #endif
1064 /* left-adjusting padding (always blank) */
1065 if (flags & LADJUST)
1066 PAD(width - realsz, blanks);
1067
1068 /* finally, adjust ret */
1069 if (width < realsz)
1070 width = realsz;
1071 if (width > INT_MAX - ret)
1072 goto overflow;
1073 ret += width;
1074
1075 FLUSH(); /* copy out the I/O vectors */
1076 }
1077 done:
1078 FLUSH();
1079 error:
1080 va_end(orgap);
1081 if (__sferror(fp))
1082 ret = -1;
1083 goto finish;
1084
1085 overflow:
1086 errno = EOVERFLOW;
1087 ret = -1;
1088
1089 finish:
1090 #ifdef PRINTF_WIDE_CHAR
1091 if (convbuf != NULL)
1092 munmap(convbuf, convbufsiz);
1093 #endif
1094 #ifdef FLOATING_POINT
1095 if (dtoaresult)
1096 __freedtoa(dtoaresult);
1097 #endif
1098 if (argtable != NULL && argtable != statargtable) {
1099 munmap(argtable, argtablesiz);
1100 argtable = NULL;
1101 }
1102 return (ret);
1103 }
1104
1105 /*
1106 * Type ids for argument type table.
1107 */
1108 #define T_UNUSED 0
1109 #define T_SHORT 1
1110 #define T_U_SHORT 2
1111 #define TP_SHORT 3
1112 #define T_INT 4
1113 #define T_U_INT 5
1114 #define TP_INT 6
1115 #define T_LONG 7
1116 #define T_U_LONG 8
1117 #define TP_LONG 9
1118 #define T_LLONG 10
1119 #define T_U_LLONG 11
1120 #define TP_LLONG 12
1121 #define T_DOUBLE 13
1122 #define T_LONG_DOUBLE 14
1123 #define TP_CHAR 15
1124 #define TP_VOID 16
1125 #define T_PTRINT 17
1126 #define TP_PTRINT 18
1127 #define T_SIZEINT 19
1128 #define T_SSIZEINT 20
1129 #define TP_SSIZEINT 21
1130 #define T_MAXINT 22
1131 #define T_MAXUINT 23
1132 #define TP_MAXINT 24
1133 #define T_CHAR 25
1134 #define T_U_CHAR 26
1135 #define T_WINT 27
1136 #define TP_WCHAR 28
1137
1138 /*
1139 * Find all arguments when a positional parameter is encountered. Returns a
1140 * table, indexed by argument number, of pointers to each arguments. The
1141 * initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
1142 * It will be replaced with a mmap-ed one if it overflows (malloc cannot be
1143 * used since we are attempting to make snprintf thread safe, and alloca is
1144 * problematic since we have nested functions..)
1145 */
1146 static int
__find_arguments(const char * fmt0,va_list ap,union arg ** argtable,size_t * argtablesiz)1147 __find_arguments(const char *fmt0, va_list ap, union arg **argtable,
1148 size_t *argtablesiz)
1149 {
1150 char *fmt; /* format string */
1151 int ch; /* character from fmt */
1152 int n, n2; /* handy integer (short term usage) */
1153 char *cp; /* handy char pointer (short term usage) */
1154 int flags; /* flags as above */
1155 unsigned char *typetable; /* table of types */
1156 unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
1157 int tablesize; /* current size of type table */
1158 int tablemax; /* largest used index in table */
1159 int nextarg; /* 1-based argument index */
1160 int ret = 0; /* return value */
1161
1162 /*
1163 * Add an argument type to the table, expanding if necessary.
1164 */
1165 #define ADDTYPE(type) \
1166 ((nextarg >= tablesize) ? \
1167 __grow_type_table(&typetable, &tablesize) : 0, \
1168 (nextarg > tablemax) ? tablemax = nextarg : 0, \
1169 typetable[nextarg++] = type)
1170
1171 #define ADDSARG() \
1172 ((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \
1173 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
1174 ((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \
1175 ((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \
1176 ((flags&LONGINT) ? ADDTYPE(T_LONG) : \
1177 ((flags&SHORTINT) ? ADDTYPE(T_SHORT) : \
1178 ((flags&CHARINT) ? ADDTYPE(T_CHAR) : ADDTYPE(T_INT))))))))
1179
1180 #define ADDUARG() \
1181 ((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \
1182 ((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
1183 ((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \
1184 ((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \
1185 ((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
1186 ((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : \
1187 ((flags&CHARINT) ? ADDTYPE(T_U_CHAR) : ADDTYPE(T_U_INT))))))))
1188
1189 /*
1190 * Add * arguments to the type array.
1191 */
1192 #define ADDASTER() \
1193 n2 = 0; \
1194 cp = fmt; \
1195 while (is_digit(*cp)) { \
1196 APPEND_DIGIT(n2, *cp); \
1197 cp++; \
1198 } \
1199 if (*cp == '$') { \
1200 int hold = nextarg; \
1201 nextarg = n2; \
1202 ADDTYPE(T_INT); \
1203 nextarg = hold; \
1204 fmt = ++cp; \
1205 } else { \
1206 ADDTYPE(T_INT); \
1207 }
1208 fmt = (char *)fmt0;
1209 typetable = stattypetable;
1210 tablesize = STATIC_ARG_TBL_SIZE;
1211 tablemax = 0;
1212 nextarg = 1;
1213 memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
1214
1215 /*
1216 * Scan the format for conversions (`%' character).
1217 */
1218 for (;;) {
1219 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
1220 continue;
1221 if (ch == '\0')
1222 goto done;
1223 fmt++; /* skip over '%' */
1224
1225 flags = 0;
1226
1227 rflag: ch = *fmt++;
1228 reswitch: switch (ch) {
1229 case ' ':
1230 case '#':
1231 case '\'':
1232 goto rflag;
1233 case '*':
1234 ADDASTER();
1235 goto rflag;
1236 case '-':
1237 case '+':
1238 goto rflag;
1239 case '.':
1240 if ((ch = *fmt++) == '*') {
1241 ADDASTER();
1242 goto rflag;
1243 }
1244 while (is_digit(ch)) {
1245 ch = *fmt++;
1246 }
1247 goto reswitch;
1248 case '0':
1249 goto rflag;
1250 case '1': case '2': case '3': case '4':
1251 case '5': case '6': case '7': case '8': case '9':
1252 n = 0;
1253 do {
1254 APPEND_DIGIT(n ,ch);
1255 ch = *fmt++;
1256 } while (is_digit(ch));
1257 if (ch == '$') {
1258 nextarg = n;
1259 goto rflag;
1260 }
1261 goto reswitch;
1262 #ifdef FLOATING_POINT
1263 case 'L':
1264 flags |= LONGDBL;
1265 goto rflag;
1266 #endif
1267 case 'h':
1268 if (*fmt == 'h') {
1269 fmt++;
1270 flags |= CHARINT;
1271 } else {
1272 flags |= SHORTINT;
1273 }
1274 goto rflag;
1275 case 'j':
1276 flags |= MAXINT;
1277 goto rflag;
1278 case 'l':
1279 if (*fmt == 'l') {
1280 fmt++;
1281 flags |= LLONGINT;
1282 } else {
1283 flags |= LONGINT;
1284 }
1285 goto rflag;
1286 case 'q':
1287 flags |= LLONGINT;
1288 goto rflag;
1289 case 't':
1290 flags |= PTRINT;
1291 goto rflag;
1292 case 'z':
1293 flags |= SIZEINT;
1294 goto rflag;
1295 case 'c':
1296 #ifdef PRINTF_WIDE_CHAR
1297 if (flags & LONGINT)
1298 ADDTYPE(T_WINT);
1299 else
1300 #endif
1301 ADDTYPE(T_INT);
1302 break;
1303 case 'D':
1304 flags |= LONGINT;
1305 /*FALLTHROUGH*/
1306 case 'd':
1307 case 'i':
1308 ADDSARG();
1309 break;
1310 #ifdef FLOATING_POINT
1311 case 'a':
1312 case 'A':
1313 case 'e':
1314 case 'E':
1315 case 'f':
1316 case 'F':
1317 case 'g':
1318 case 'G':
1319 if (flags & LONGDBL)
1320 ADDTYPE(T_LONG_DOUBLE);
1321 else
1322 ADDTYPE(T_DOUBLE);
1323 break;
1324 #endif /* FLOATING_POINT */
1325 case 'n':
1326 if (flags & LLONGINT)
1327 ADDTYPE(TP_LLONG);
1328 else if (flags & LONGINT)
1329 ADDTYPE(TP_LONG);
1330 else if (flags & SHORTINT)
1331 ADDTYPE(TP_SHORT);
1332 else if (flags & PTRINT)
1333 ADDTYPE(TP_PTRINT);
1334 else if (flags & SIZEINT)
1335 ADDTYPE(TP_SSIZEINT);
1336 else if (flags & MAXINT)
1337 ADDTYPE(TP_MAXINT);
1338 else
1339 ADDTYPE(TP_INT);
1340 continue; /* no output */
1341 case 'O':
1342 flags |= LONGINT;
1343 /*FALLTHROUGH*/
1344 case 'o':
1345 ADDUARG();
1346 break;
1347 case 'p':
1348 ADDTYPE(TP_VOID);
1349 break;
1350 case 's':
1351 #ifdef PRINTF_WIDE_CHAR
1352 if (flags & LONGINT)
1353 ADDTYPE(TP_WCHAR);
1354 else
1355 #endif
1356 ADDTYPE(TP_CHAR);
1357 break;
1358 case 'U':
1359 flags |= LONGINT;
1360 /*FALLTHROUGH*/
1361 case 'u':
1362 case 'X':
1363 case 'x':
1364 ADDUARG();
1365 break;
1366 default: /* "%?" prints ?, unless ? is NUL */
1367 if (ch == '\0')
1368 goto done;
1369 break;
1370 }
1371 }
1372 done:
1373 /*
1374 * Build the argument table.
1375 */
1376 if (tablemax >= STATIC_ARG_TBL_SIZE) {
1377 *argtablesiz = sizeof(union arg) * (tablemax + 1);
1378 *argtable = mmap(NULL, *argtablesiz,
1379 PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0);
1380 if (*argtable == MAP_FAILED)
1381 return (-1);
1382 }
1383
1384 for (n = 1; n <= tablemax; n++) {
1385 switch (typetable[n]) {
1386 case T_UNUSED:
1387 case T_CHAR:
1388 case T_U_CHAR:
1389 case T_SHORT:
1390 case T_U_SHORT:
1391 case T_INT:
1392 (*argtable)[n].intarg = va_arg(ap, int);
1393 break;
1394 case TP_SHORT:
1395 (*argtable)[n].pshortarg = va_arg(ap, short *);
1396 break;
1397 case T_U_INT:
1398 (*argtable)[n].uintarg = va_arg(ap, unsigned int);
1399 break;
1400 case TP_INT:
1401 (*argtable)[n].pintarg = va_arg(ap, int *);
1402 break;
1403 case T_LONG:
1404 (*argtable)[n].longarg = va_arg(ap, long);
1405 break;
1406 case T_U_LONG:
1407 (*argtable)[n].ulongarg = va_arg(ap, unsigned long);
1408 break;
1409 case TP_LONG:
1410 (*argtable)[n].plongarg = va_arg(ap, long *);
1411 break;
1412 case T_LLONG:
1413 (*argtable)[n].longlongarg = va_arg(ap, long long);
1414 break;
1415 case T_U_LLONG:
1416 (*argtable)[n].ulonglongarg = va_arg(ap, unsigned long long);
1417 break;
1418 case TP_LLONG:
1419 (*argtable)[n].plonglongarg = va_arg(ap, long long *);
1420 break;
1421 #ifdef FLOATING_POINT
1422 case T_DOUBLE:
1423 (*argtable)[n].doublearg = va_arg(ap, double);
1424 break;
1425 case T_LONG_DOUBLE:
1426 (*argtable)[n].longdoublearg = va_arg(ap, long double);
1427 break;
1428 #endif
1429 case TP_CHAR:
1430 (*argtable)[n].pchararg = va_arg(ap, char *);
1431 break;
1432 case TP_VOID:
1433 (*argtable)[n].pvoidarg = va_arg(ap, void *);
1434 break;
1435 case T_PTRINT:
1436 (*argtable)[n].ptrdiffarg = va_arg(ap, ptrdiff_t);
1437 break;
1438 case TP_PTRINT:
1439 (*argtable)[n].pptrdiffarg = va_arg(ap, ptrdiff_t *);
1440 break;
1441 case T_SIZEINT:
1442 (*argtable)[n].sizearg = va_arg(ap, size_t);
1443 break;
1444 case T_SSIZEINT:
1445 (*argtable)[n].ssizearg = va_arg(ap, ssize_t);
1446 break;
1447 case TP_SSIZEINT:
1448 (*argtable)[n].pssizearg = va_arg(ap, ssize_t *);
1449 break;
1450 case T_MAXINT:
1451 (*argtable)[n].intmaxarg = va_arg(ap, intmax_t);
1452 break;
1453 case T_MAXUINT:
1454 (*argtable)[n].uintmaxarg = va_arg(ap, uintmax_t);
1455 break;
1456 case TP_MAXINT:
1457 (*argtable)[n].pintmaxarg = va_arg(ap, intmax_t *);
1458 break;
1459 #ifdef PRINTF_WIDE_CHAR
1460 case T_WINT:
1461 (*argtable)[n].wintarg = va_arg(ap, wint_t);
1462 break;
1463 case TP_WCHAR:
1464 (*argtable)[n].pwchararg = va_arg(ap, wchar_t *);
1465 break;
1466 #endif
1467 }
1468 }
1469 goto finish;
1470
1471 overflow:
1472 errno = EOVERFLOW;
1473 ret = -1;
1474
1475 finish:
1476 if (typetable != NULL && typetable != stattypetable) {
1477 munmap(typetable, *argtablesiz);
1478 typetable = NULL;
1479 }
1480 return (ret);
1481 }
1482
1483 /*
1484 * Increase the size of the type table.
1485 */
1486 static int
__grow_type_table(unsigned char ** typetable,int * tablesize)1487 __grow_type_table(unsigned char **typetable, int *tablesize)
1488 {
1489 unsigned char *oldtable = *typetable;
1490 int newsize = *tablesize * 2;
1491
1492 if (newsize < getpagesize())
1493 newsize = getpagesize();
1494
1495 if (*tablesize == STATIC_ARG_TBL_SIZE) {
1496 *typetable = mmap(NULL, newsize, PROT_WRITE|PROT_READ,
1497 MAP_ANON|MAP_PRIVATE, -1, 0);
1498 if (*typetable == MAP_FAILED)
1499 return (-1);
1500 bcopy(oldtable, *typetable, *tablesize);
1501 } else {
1502 unsigned char *new = mmap(NULL, newsize, PROT_WRITE|PROT_READ,
1503 MAP_ANON|MAP_PRIVATE, -1, 0);
1504 if (new == MAP_FAILED)
1505 return (-1);
1506 memmove(new, *typetable, *tablesize);
1507 munmap(*typetable, *tablesize);
1508 *typetable = new;
1509 }
1510 memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize));
1511
1512 *tablesize = newsize;
1513 return (0);
1514 }
1515
1516
1517 #ifdef FLOATING_POINT
1518 static int
exponent(char * p0,int exp,int fmtch)1519 exponent(char *p0, int exp, int fmtch)
1520 {
1521 char *p, *t;
1522 char expbuf[MAXEXPDIG];
1523
1524 p = p0;
1525 *p++ = fmtch;
1526 if (exp < 0) {
1527 exp = -exp;
1528 *p++ = '-';
1529 } else
1530 *p++ = '+';
1531 t = expbuf + MAXEXPDIG;
1532 if (exp > 9) {
1533 do {
1534 *--t = to_char(exp % 10);
1535 } while ((exp /= 10) > 9);
1536 *--t = to_char(exp);
1537 for (; t < expbuf + MAXEXPDIG; *p++ = *t++)
1538 /* nothing */;
1539 } else {
1540 /*
1541 * Exponents for decimal floating point conversions
1542 * (%[eEgG]) must be at least two characters long,
1543 * whereas exponents for hexadecimal conversions can
1544 * be only one character long.
1545 */
1546 if (fmtch == 'e' || fmtch == 'E')
1547 *p++ = '0';
1548 *p++ = to_char(exp);
1549 }
1550 return (p - p0);
1551 }
1552 #endif /* FLOATING_POINT */
1553