1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Chris Torek.
9 *
10 * Copyright (c) 2011 The FreeBSD Foundation
11 *
12 * Portions of this software were developed by David Chisnall
13 * under sponsorship from the FreeBSD Foundation.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 */
39
40 #if defined(LIBC_SCCS) && !defined(lint)
41 static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93";
42 #endif /* LIBC_SCCS and not lint */
43 #include <sys/cdefs.h>
44 /*
45 * Actual printf innards.
46 *
47 * This code is large and complicated...
48 */
49
50 #include "namespace.h"
51 #include <sys/types.h>
52
53 #include <ctype.h>
54 #include <errno.h>
55 #include <limits.h>
56 #include <locale.h>
57 #include <stddef.h>
58 #include <stdint.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <wchar.h>
63 #include <printf.h>
64
65 #include <stdarg.h>
66 #include "xlocale_private.h"
67 #include "un-namespace.h"
68
69 #include "libc_private.h"
70 #include "local.h"
71 #include "fvwrite.h"
72 #include "printflocal.h"
73
74 static int __sprint(FILE *, struct __suio *, locale_t);
75 static int __sbprintf(FILE *, locale_t, int, const char *, va_list)
76 __printflike(4, 0)
77 __noinline;
78 static char *__wcsconv(wchar_t *, int);
79
80 #define CHAR char
81 #include "printfcommon.h"
82
83 struct grouping_state {
84 char *thousands_sep; /* locale-specific thousands separator */
85 int thousep_len; /* length of thousands_sep */
86 const char *grouping; /* locale-specific numeric grouping rules */
87 int lead; /* sig figs before decimal or group sep */
88 int nseps; /* number of group separators with ' */
89 int nrepeats; /* number of repeats of the last group */
90 };
91
92 /*
93 * Initialize the thousands' grouping state in preparation to print a
94 * number with ndigits digits. This routine returns the total number
95 * of bytes that will be needed.
96 */
97 static int
grouping_init(struct grouping_state * gs,int ndigits,locale_t loc)98 grouping_init(struct grouping_state *gs, int ndigits, locale_t loc)
99 {
100 struct lconv *locale;
101
102 locale = localeconv_l(loc);
103 gs->grouping = locale->grouping;
104 gs->thousands_sep = locale->thousands_sep;
105 gs->thousep_len = strlen(gs->thousands_sep);
106
107 gs->nseps = gs->nrepeats = 0;
108 gs->lead = ndigits;
109 while (*gs->grouping != CHAR_MAX) {
110 if (gs->lead <= *gs->grouping)
111 break;
112 gs->lead -= *gs->grouping;
113 if (*(gs->grouping+1)) {
114 gs->nseps++;
115 gs->grouping++;
116 } else
117 gs->nrepeats++;
118 }
119 return ((gs->nseps + gs->nrepeats) * gs->thousep_len);
120 }
121
122 /*
123 * Print a number with thousands' separators.
124 */
125 static int
grouping_print(struct grouping_state * gs,struct io_state * iop,const CHAR * cp,const CHAR * ep,locale_t locale)126 grouping_print(struct grouping_state *gs, struct io_state *iop,
127 const CHAR *cp, const CHAR *ep, locale_t locale)
128 {
129 const CHAR *cp0 = cp;
130
131 if (io_printandpad(iop, cp, ep, gs->lead, zeroes, locale))
132 return (-1);
133 cp += gs->lead;
134 while (gs->nseps > 0 || gs->nrepeats > 0) {
135 if (gs->nrepeats > 0)
136 gs->nrepeats--;
137 else {
138 gs->grouping--;
139 gs->nseps--;
140 }
141 if (io_print(iop, gs->thousands_sep, gs->thousep_len, locale))
142 return (-1);
143 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes, locale))
144 return (-1);
145 cp += *gs->grouping;
146 }
147 if (cp > ep)
148 cp = ep;
149 return (cp - cp0);
150 }
151
152 /*
153 * Flush out all the vectors defined by the given uio,
154 * then reset it so that it can be reused.
155 */
156 static int
__sprint(FILE * fp,struct __suio * uio,locale_t locale)157 __sprint(FILE *fp, struct __suio *uio, locale_t locale)
158 {
159 int err;
160
161 if (uio->uio_resid == 0) {
162 uio->uio_iovcnt = 0;
163 return (0);
164 }
165 err = __sfvwrite(fp, uio);
166 uio->uio_resid = 0;
167 uio->uio_iovcnt = 0;
168 return (err);
169 }
170
171 /*
172 * Helper function for `fprintf to unbuffered unix file': creates a
173 * temporary buffer. We only work on write-only files; this avoids
174 * worries about ungetc buffers and so forth.
175 */
176 static int
__sbprintf(FILE * fp,locale_t locale,int serrno,const char * fmt,va_list ap)177 __sbprintf(FILE *fp, locale_t locale, int serrno, const char *fmt, va_list ap)
178 {
179 int ret;
180 FILE fake = FAKE_FILE;
181 unsigned char buf[BUFSIZ];
182
183 /* XXX This is probably not needed. */
184 if (prepwrite(fp) != 0)
185 return (EOF);
186
187 /* copy the important variables */
188 fake._flags = fp->_flags & ~__SNBF;
189 fake._file = fp->_file;
190 fake._cookie = fp->_cookie;
191 fake._write = fp->_write;
192 fake._orientation = fp->_orientation;
193 fake._mbstate = fp->_mbstate;
194
195 /* set up the buffer */
196 fake._bf._base = fake._p = buf;
197 fake._bf._size = fake._w = sizeof(buf);
198 fake._lbfsize = 0; /* not actually used, but Just In Case */
199
200 /* do the work, then copy any error status */
201 ret = __vfprintf(&fake, locale, serrno, fmt, ap);
202 if (ret >= 0 && __fflush(&fake))
203 ret = EOF;
204 if (fake._flags & __SERR)
205 fp->_flags |= __SERR;
206 return (ret);
207 }
208
209 /*
210 * Convert a wide character string argument for the %ls format to a multibyte
211 * string representation. If not -1, prec specifies the maximum number of
212 * bytes to output, and also means that we can't assume that the wide char.
213 * string ends is null-terminated.
214 */
215 static char *
__wcsconv(wchar_t * wcsarg,int prec)216 __wcsconv(wchar_t *wcsarg, int prec)
217 {
218 static const mbstate_t initial;
219 mbstate_t mbs;
220 char buf[MB_LEN_MAX];
221 wchar_t *p;
222 char *convbuf;
223 size_t clen, nbytes;
224
225 /* Allocate space for the maximum number of bytes we could output. */
226 if (prec < 0) {
227 p = wcsarg;
228 mbs = initial;
229 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs);
230 if (nbytes == (size_t)-1)
231 return (NULL);
232 } else {
233 /*
234 * Optimisation: if the output precision is small enough,
235 * just allocate enough memory for the maximum instead of
236 * scanning the string.
237 */
238 if (prec < 128)
239 nbytes = prec;
240 else {
241 nbytes = 0;
242 p = wcsarg;
243 mbs = initial;
244 for (;;) {
245 clen = wcrtomb(buf, *p++, &mbs);
246 if (clen == 0 || clen == (size_t)-1 ||
247 nbytes + clen > prec)
248 break;
249 nbytes += clen;
250 }
251 }
252 }
253 if ((convbuf = malloc(nbytes + 1)) == NULL)
254 return (NULL);
255
256 /* Fill the output buffer. */
257 p = wcsarg;
258 mbs = initial;
259 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p,
260 nbytes, &mbs)) == (size_t)-1) {
261 free(convbuf);
262 return (NULL);
263 }
264 convbuf[nbytes] = '\0';
265 return (convbuf);
266 }
267
268 /*
269 * MT-safe version
270 */
271 int
vfprintf_l(FILE * __restrict fp,locale_t locale,const char * __restrict fmt0,va_list ap)272 vfprintf_l(FILE * __restrict fp, locale_t locale, const char * __restrict fmt0,
273 va_list ap)
274 {
275 int serrno = errno;
276 int ret;
277 FIX_LOCALE(locale);
278
279 FLOCKFILE_CANCELSAFE(fp);
280 /* optimise fprintf(stderr) (and other unbuffered Unix files) */
281 if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
282 fp->_file >= 0)
283 ret = __sbprintf(fp, locale, serrno, fmt0, ap);
284 else
285 ret = __vfprintf(fp, locale, serrno, fmt0, ap);
286 FUNLOCKFILE_CANCELSAFE();
287 return (ret);
288 }
289 int
vfprintf(FILE * __restrict fp,const char * __restrict fmt0,va_list ap)290 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap)
291 {
292 return vfprintf_l(fp, __get_locale(), fmt0, ap);
293 }
294
295 /*
296 * The size of the buffer we use as scratch space for integer
297 * conversions, among other things. We need enough space to
298 * write a uintmax_t in octal (plus one byte).
299 */
300 #if UINTMAX_MAX <= UINT64_MAX
301 #define BUF 32
302 #else
303 #error "BUF must be large enough to format a uintmax_t"
304 #endif
305
306 /*
307 * Non-MT-safe version
308 */
309 int
__vfprintf(FILE * fp,locale_t locale,int serrno,const char * fmt0,va_list ap)310 __vfprintf(FILE *fp, locale_t locale, int serrno, const char *fmt0, va_list ap)
311 {
312 char *fmt; /* format string */
313 int ch; /* character from fmt */
314 int n, n2; /* handy integer (short term usage) */
315 char *cp; /* handy char pointer (short term usage) */
316 int flags; /* flags as above */
317 int ret; /* return value accumulator */
318 int width; /* width from format (%8d), or 0 */
319 int prec; /* precision from format; <0 for N/A */
320 int error;
321 char errnomsg[NL_TEXTMAX];
322 char sign; /* sign prefix (' ', '+', '-', or \0) */
323 struct grouping_state gs; /* thousands' grouping info */
324
325 #ifndef NO_FLOATING_POINT
326 /*
327 * We can decompose the printed representation of floating
328 * point numbers into several parts, some of which may be empty:
329 *
330 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ
331 * A B ---C--- D E F
332 *
333 * A: 'sign' holds this value if present; '\0' otherwise
334 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal
335 * C: cp points to the string MMMNNN. Leading and trailing
336 * zeros are not in the string and must be added.
337 * D: expchar holds this character; '\0' if no exponent, e.g. %f
338 * F: at least two digits for decimal, at least one digit for hex
339 */
340 char *decimal_point; /* locale specific decimal point */
341 int decpt_len; /* length of decimal_point */
342 int signflag; /* true if float is negative */
343 union { /* floating point arguments %[aAeEfFgG] */
344 double dbl;
345 long double ldbl;
346 } fparg;
347 int expt; /* integer value of exponent */
348 char expchar; /* exponent character: [eEpP\0] */
349 char *dtoaend; /* pointer to end of converted digits */
350 int expsize; /* character count for expstr */
351 int ndig; /* actual number of digits returned by dtoa */
352 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */
353 char *dtoaresult; /* buffer allocated by dtoa */
354 #endif
355 u_long ulval; /* integer arguments %[diouxX] */
356 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */
357 int base; /* base for [diouxX] conversion */
358 int dprec; /* a copy of prec if [diouxX], 0 otherwise */
359 int realsz; /* field size expanded by dprec, sign, etc */
360 int size; /* size of converted field or string */
361 int prsize; /* max size of printed field */
362 const char *xdigs; /* digits for %[xX] conversion */
363 struct io_state io; /* I/O buffering state */
364 char buf[BUF]; /* buffer with space for digits of uintmax_t */
365 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */
366 union arg *argtable; /* args, built due to positional arg */
367 union arg statargtable [STATIC_ARG_TBL_SIZE];
368 int nextarg; /* 1-based argument index */
369 va_list orgap; /* original argument pointer */
370 char *convbuf; /* wide to multibyte conversion result */
371 int savserr;
372
373 static const char xdigs_lower[16] = "0123456789abcdef";
374 static const char xdigs_upper[16] = "0123456789ABCDEF";
375
376 /* BEWARE, these `goto error' on error. */
377 #define PRINT(ptr, len) { \
378 if (io_print(&io, (ptr), (len), locale)) \
379 goto error; \
380 }
381 #define PAD(howmany, with) { \
382 if (io_pad(&io, (howmany), (with), locale)) \
383 goto error; \
384 }
385 #define PRINTANDPAD(p, ep, len, with) { \
386 if (io_printandpad(&io, (p), (ep), (len), (with), locale)) \
387 goto error; \
388 }
389 #define FLUSH() { \
390 if (io_flush(&io, locale)) \
391 goto error; \
392 }
393
394 /*
395 * Get the argument indexed by nextarg. If the argument table is
396 * built, use it to get the argument. If its not, get the next
397 * argument (and arguments must be gotten sequentially).
398 */
399 #define GETARG(type) \
400 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \
401 (nextarg++, va_arg(ap, type)))
402
403 /*
404 * To extend shorts properly, we need both signed and unsigned
405 * argument extraction methods.
406 */
407 #define SARG() \
408 (flags&LONGINT ? GETARG(long) : \
409 flags&SHORTINT ? (long)(short)GETARG(int) : \
410 flags&CHARINT ? (long)(signed char)GETARG(int) : \
411 (long)GETARG(int))
412 #define UARG() \
413 (flags&LONGINT ? GETARG(u_long) : \
414 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \
415 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \
416 (u_long)GETARG(u_int))
417 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT)
418 #define SJARG() \
419 (flags&INTMAXT ? GETARG(intmax_t) : \
420 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \
421 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \
422 (intmax_t)GETARG(long long))
423 #define UJARG() \
424 (flags&INTMAXT ? GETARG(uintmax_t) : \
425 flags&SIZET ? (uintmax_t)GETARG(size_t) : \
426 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \
427 (uintmax_t)GETARG(unsigned long long))
428
429 /*
430 * Get * arguments, including the form *nn$. Preserve the nextarg
431 * that the argument can be gotten once the type is determined.
432 */
433 #define GETASTER(val) \
434 n2 = 0; \
435 cp = fmt; \
436 while (is_digit(*cp)) { \
437 n2 = 10 * n2 + to_digit(*cp); \
438 cp++; \
439 } \
440 if (*cp == '$') { \
441 int hold = nextarg; \
442 if (argtable == NULL) { \
443 argtable = statargtable; \
444 if (__find_arguments (fmt0, orgap, &argtable)) { \
445 ret = EOF; \
446 goto error; \
447 } \
448 } \
449 nextarg = n2; \
450 val = GETARG (int); \
451 nextarg = hold; \
452 fmt = ++cp; \
453 } else { \
454 val = GETARG (int); \
455 }
456
457 if (__use_xprintf == 0 && getenv("USE_XPRINTF"))
458 __use_xprintf = 1;
459 if (__use_xprintf > 0)
460 return (__xvprintf(fp, fmt0, ap));
461
462 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
463 if (prepwrite(fp) != 0) {
464 errno = EBADF;
465 return (EOF);
466 }
467
468 savserr = fp->_flags & __SERR;
469 fp->_flags &= ~__SERR;
470
471 convbuf = NULL;
472 fmt = (char *)fmt0;
473 argtable = NULL;
474 nextarg = 1;
475 va_copy(orgap, ap);
476 io_init(&io, fp);
477 ret = 0;
478 #ifndef NO_FLOATING_POINT
479 dtoaresult = NULL;
480 decimal_point = localeconv_l(locale)->decimal_point;
481 /* The overwhelmingly common case is decpt_len == 1. */
482 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point));
483 #endif
484
485 /*
486 * Scan the format for conversions (`%' character).
487 */
488 for (;;) {
489 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
490 /* void */;
491 if ((n = fmt - cp) != 0) {
492 if ((unsigned)ret + n > INT_MAX) {
493 ret = EOF;
494 errno = EOVERFLOW;
495 goto error;
496 }
497 PRINT(cp, n);
498 ret += n;
499 }
500 if (ch == '\0')
501 goto done;
502 fmt++; /* skip over '%' */
503
504 flags = 0;
505 dprec = 0;
506 width = 0;
507 prec = -1;
508 gs.grouping = NULL;
509 sign = '\0';
510 ox[1] = '\0';
511
512 rflag: ch = *fmt++;
513 reswitch: switch (ch) {
514 case ' ':
515 /*-
516 * ``If the space and + flags both appear, the space
517 * flag will be ignored.''
518 * -- ANSI X3J11
519 */
520 if (!sign)
521 sign = ' ';
522 goto rflag;
523 case '#':
524 flags |= ALT;
525 goto rflag;
526 case '*':
527 /*-
528 * ``A negative field width argument is taken as a
529 * - flag followed by a positive field width.''
530 * -- ANSI X3J11
531 * They don't exclude field widths read from args.
532 */
533 GETASTER (width);
534 if (width >= 0)
535 goto rflag;
536 width = -width;
537 /* FALLTHROUGH */
538 case '-':
539 flags |= LADJUST;
540 goto rflag;
541 case '+':
542 sign = '+';
543 goto rflag;
544 case '\'':
545 flags |= GROUPING;
546 goto rflag;
547 case '.':
548 if ((ch = *fmt++) == '*') {
549 GETASTER (prec);
550 goto rflag;
551 }
552 prec = 0;
553 while (is_digit(ch)) {
554 prec = 10 * prec + to_digit(ch);
555 ch = *fmt++;
556 }
557 goto reswitch;
558 case '0':
559 /*-
560 * ``Note that 0 is taken as a flag, not as the
561 * beginning of a field width.''
562 * -- ANSI X3J11
563 */
564 flags |= ZEROPAD;
565 goto rflag;
566 case '1': case '2': case '3': case '4':
567 case '5': case '6': case '7': case '8': case '9':
568 n = 0;
569 do {
570 n = 10 * n + to_digit(ch);
571 ch = *fmt++;
572 } while (is_digit(ch));
573 if (ch == '$') {
574 nextarg = n;
575 if (argtable == NULL) {
576 argtable = statargtable;
577 if (__find_arguments (fmt0, orgap,
578 &argtable)) {
579 ret = EOF;
580 goto error;
581 }
582 }
583 goto rflag;
584 }
585 width = n;
586 goto reswitch;
587 #ifndef NO_FLOATING_POINT
588 case 'L':
589 flags |= LONGDBL;
590 goto rflag;
591 #endif
592 case 'h':
593 if (flags & SHORTINT) {
594 flags &= ~SHORTINT;
595 flags |= CHARINT;
596 } else
597 flags |= SHORTINT;
598 goto rflag;
599 case 'j':
600 flags |= INTMAXT;
601 goto rflag;
602 case 'l':
603 if (flags & LONGINT) {
604 flags &= ~LONGINT;
605 flags |= LLONGINT;
606 } else
607 flags |= LONGINT;
608 goto rflag;
609 case 'q':
610 flags |= LLONGINT; /* not necessarily */
611 goto rflag;
612 case 't':
613 flags |= PTRDIFFT;
614 goto rflag;
615 case 'z':
616 flags |= SIZET;
617 goto rflag;
618 case 'C':
619 flags |= LONGINT;
620 /*FALLTHROUGH*/
621 case 'c':
622 if (flags & LONGINT) {
623 static const mbstate_t initial;
624 mbstate_t mbs;
625 size_t mbseqlen;
626
627 mbs = initial;
628 mbseqlen = wcrtomb(cp = buf,
629 (wchar_t)GETARG(wint_t), &mbs);
630 if (mbseqlen == (size_t)-1) {
631 fp->_flags |= __SERR;
632 goto error;
633 }
634 size = (int)mbseqlen;
635 } else {
636 *(cp = buf) = GETARG(int);
637 size = 1;
638 }
639 sign = '\0';
640 break;
641 case 'D':
642 flags |= LONGINT;
643 /*FALLTHROUGH*/
644 case 'd':
645 case 'i':
646 if (flags & INTMAX_SIZE) {
647 ujval = SJARG();
648 if ((intmax_t)ujval < 0) {
649 ujval = -ujval;
650 sign = '-';
651 }
652 } else {
653 ulval = SARG();
654 if ((long)ulval < 0) {
655 ulval = -ulval;
656 sign = '-';
657 }
658 }
659 base = 10;
660 goto number;
661 #ifndef NO_FLOATING_POINT
662 case 'a':
663 case 'A':
664 if (ch == 'a') {
665 ox[1] = 'x';
666 xdigs = xdigs_lower;
667 expchar = 'p';
668 } else {
669 ox[1] = 'X';
670 xdigs = xdigs_upper;
671 expchar = 'P';
672 }
673 if (prec >= 0)
674 prec++;
675 if (dtoaresult != NULL)
676 freedtoa(dtoaresult);
677 if (flags & LONGDBL) {
678 fparg.ldbl = GETARG(long double);
679 dtoaresult = cp =
680 __hldtoa(fparg.ldbl, xdigs, prec,
681 &expt, &signflag, &dtoaend);
682 } else {
683 fparg.dbl = GETARG(double);
684 dtoaresult = cp =
685 __hdtoa(fparg.dbl, xdigs, prec,
686 &expt, &signflag, &dtoaend);
687 }
688 if (prec < 0)
689 prec = dtoaend - cp;
690 if (expt == INT_MAX)
691 ox[1] = '\0';
692 goto fp_common;
693 case 'e':
694 case 'E':
695 expchar = ch;
696 if (prec < 0) /* account for digit before decpt */
697 prec = DEFPREC + 1;
698 else
699 prec++;
700 goto fp_begin;
701 case 'f':
702 case 'F':
703 expchar = '\0';
704 goto fp_begin;
705 case 'g':
706 case 'G':
707 expchar = ch - ('g' - 'e');
708 if (prec == 0)
709 prec = 1;
710 fp_begin:
711 if (prec < 0)
712 prec = DEFPREC;
713 if (dtoaresult != NULL)
714 freedtoa(dtoaresult);
715 if (flags & LONGDBL) {
716 fparg.ldbl = GETARG(long double);
717 dtoaresult = cp =
718 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
719 &expt, &signflag, &dtoaend);
720 } else {
721 fparg.dbl = GETARG(double);
722 dtoaresult = cp =
723 dtoa(fparg.dbl, expchar ? 2 : 3, prec,
724 &expt, &signflag, &dtoaend);
725 if (expt == 9999)
726 expt = INT_MAX;
727 }
728 fp_common:
729 if (signflag)
730 sign = '-';
731 if (expt == INT_MAX) { /* inf or nan */
732 if (*cp == 'N') {
733 cp = (ch >= 'a') ? "nan" : "NAN";
734 sign = '\0';
735 } else
736 cp = (ch >= 'a') ? "inf" : "INF";
737 size = 3;
738 flags &= ~ZEROPAD;
739 break;
740 }
741 flags |= FPT;
742 ndig = dtoaend - cp;
743 if (ch == 'g' || ch == 'G') {
744 if (expt > -4 && expt <= prec) {
745 /* Make %[gG] smell like %[fF] */
746 expchar = '\0';
747 if (flags & ALT)
748 prec -= expt;
749 else
750 prec = ndig - expt;
751 if (prec < 0)
752 prec = 0;
753 } else {
754 /*
755 * Make %[gG] smell like %[eE], but
756 * trim trailing zeroes if no # flag.
757 */
758 if (!(flags & ALT))
759 prec = ndig;
760 }
761 }
762 if (expchar) {
763 expsize = exponent(expstr, expt - 1, expchar);
764 size = expsize + prec;
765 if (prec > 1 || flags & ALT)
766 size += decpt_len;
767 } else {
768 /* space for digits before decimal point */
769 if (expt > 0)
770 size = expt;
771 else /* "0" */
772 size = 1;
773 /* space for decimal pt and following digits */
774 if (prec || flags & ALT)
775 size += prec + decpt_len;
776 if ((flags & GROUPING) && expt > 0)
777 size += grouping_init(&gs, expt, locale);
778 }
779 break;
780 #endif /* !NO_FLOATING_POINT */
781 case 'm':
782 error = __strerror_rl(serrno, errnomsg,
783 sizeof(errnomsg), locale);
784 cp = error == 0 ? errnomsg : "<strerror failure>";
785 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp);
786 sign = '\0';
787 break;
788 case 'n':
789 /*
790 * Assignment-like behavior is specified if the
791 * value overflows or is otherwise unrepresentable.
792 * C99 says to use `signed char' for %hhn conversions.
793 */
794 if (flags & LLONGINT)
795 *GETARG(long long *) = ret;
796 else if (flags & SIZET)
797 *GETARG(ssize_t *) = (ssize_t)ret;
798 else if (flags & PTRDIFFT)
799 *GETARG(ptrdiff_t *) = ret;
800 else if (flags & INTMAXT)
801 *GETARG(intmax_t *) = ret;
802 else if (flags & LONGINT)
803 *GETARG(long *) = ret;
804 else if (flags & SHORTINT)
805 *GETARG(short *) = ret;
806 else if (flags & CHARINT)
807 *GETARG(signed char *) = ret;
808 else
809 *GETARG(int *) = ret;
810 continue; /* no output */
811 case 'O':
812 flags |= LONGINT;
813 /*FALLTHROUGH*/
814 case 'o':
815 if (flags & INTMAX_SIZE)
816 ujval = UJARG();
817 else
818 ulval = UARG();
819 base = 8;
820 goto nosign;
821 case 'p':
822 /*-
823 * ``The argument shall be a pointer to void. The
824 * value of the pointer is converted to a sequence
825 * of printable characters, in an implementation-
826 * defined manner.''
827 * -- ANSI X3J11
828 */
829 ujval = (uintmax_t)(uintptr_t)GETARG(void *);
830 base = 16;
831 xdigs = xdigs_lower;
832 flags = flags | INTMAXT;
833 ox[1] = 'x';
834 goto nosign;
835 case 'S':
836 flags |= LONGINT;
837 /*FALLTHROUGH*/
838 case 's':
839 if (flags & LONGINT) {
840 wchar_t *wcp;
841
842 if (convbuf != NULL)
843 free(convbuf);
844 if ((wcp = GETARG(wchar_t *)) == NULL)
845 cp = "(null)";
846 else {
847 convbuf = __wcsconv(wcp, prec);
848 if (convbuf == NULL) {
849 fp->_flags |= __SERR;
850 goto error;
851 }
852 cp = convbuf;
853 }
854 } else if ((cp = GETARG(char *)) == NULL)
855 cp = "(null)";
856 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp);
857 sign = '\0';
858 break;
859 case 'U':
860 flags |= LONGINT;
861 /*FALLTHROUGH*/
862 case 'u':
863 if (flags & INTMAX_SIZE)
864 ujval = UJARG();
865 else
866 ulval = UARG();
867 base = 10;
868 goto nosign;
869 case 'X':
870 xdigs = xdigs_upper;
871 goto hex;
872 case 'x':
873 xdigs = xdigs_lower;
874 hex:
875 if (flags & INTMAX_SIZE)
876 ujval = UJARG();
877 else
878 ulval = UARG();
879 base = 16;
880 /* leading 0x/X only if non-zero */
881 if (flags & ALT &&
882 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0))
883 ox[1] = ch;
884
885 flags &= ~GROUPING;
886 /* unsigned conversions */
887 nosign: sign = '\0';
888 /*-
889 * ``... diouXx conversions ... if a precision is
890 * specified, the 0 flag will be ignored.''
891 * -- ANSI X3J11
892 */
893 number: if ((dprec = prec) >= 0)
894 flags &= ~ZEROPAD;
895
896 /*-
897 * ``The result of converting a zero value with an
898 * explicit precision of zero is no characters.''
899 * -- ANSI X3J11
900 *
901 * ``The C Standard is clear enough as is. The call
902 * printf("%#.0o", 0) should print 0.''
903 * -- Defect Report #151
904 */
905 cp = buf + BUF;
906 if (flags & INTMAX_SIZE) {
907 if (ujval != 0 || prec != 0 ||
908 (flags & ALT && base == 8))
909 cp = __ujtoa(ujval, cp, base,
910 flags & ALT, xdigs);
911 } else {
912 if (ulval != 0 || prec != 0 ||
913 (flags & ALT && base == 8))
914 cp = __ultoa(ulval, cp, base,
915 flags & ALT, xdigs);
916 }
917 size = buf + BUF - cp;
918 if (size > BUF) /* should never happen */
919 abort();
920 if ((flags & GROUPING) && size != 0)
921 size += grouping_init(&gs, size, locale);
922 break;
923 default: /* "%?" prints ?, unless ? is NUL */
924 if (ch == '\0')
925 goto done;
926 /* pretend it was %c with argument ch */
927 cp = buf;
928 *cp = ch;
929 size = 1;
930 sign = '\0';
931 break;
932 }
933
934 /*
935 * All reasonable formats wind up here. At this point, `cp'
936 * points to a string which (if not flags&LADJUST) should be
937 * padded out to `width' places. If flags&ZEROPAD, it should
938 * first be prefixed by any sign or other prefix; otherwise,
939 * it should be blank padded before the prefix is emitted.
940 * After any left-hand padding and prefixing, emit zeroes
941 * required by a decimal [diouxX] precision, then print the
942 * string proper, then emit zeroes required by any leftover
943 * floating precision; finally, if LADJUST, pad with blanks.
944 *
945 * Compute actual size, so we know how much to pad.
946 * size excludes decimal prec; realsz includes it.
947 */
948 realsz = dprec > size ? dprec : size;
949 if (sign)
950 realsz++;
951 if (ox[1])
952 realsz += 2;
953
954 prsize = width > realsz ? width : realsz;
955 if ((unsigned)ret + prsize > INT_MAX) {
956 ret = EOF;
957 errno = EOVERFLOW;
958 goto error;
959 }
960
961 /* right-adjusting blank padding */
962 if ((flags & (LADJUST|ZEROPAD)) == 0)
963 PAD(width - realsz, blanks);
964
965 /* prefix */
966 if (sign)
967 PRINT(&sign, 1);
968
969 if (ox[1]) { /* ox[1] is either x, X, or \0 */
970 ox[0] = '0';
971 PRINT(ox, 2);
972 }
973
974 /* right-adjusting zero padding */
975 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
976 PAD(width - realsz, zeroes);
977
978 /* the string or number proper */
979 #ifndef NO_FLOATING_POINT
980 if ((flags & FPT) == 0) {
981 #endif
982 /* leading zeroes from decimal precision */
983 PAD(dprec - size, zeroes);
984 if (gs.grouping) {
985 if (grouping_print(&gs, &io, cp, buf+BUF, locale) < 0)
986 goto error;
987 } else {
988 PRINT(cp, size);
989 }
990 #ifndef NO_FLOATING_POINT
991 } else { /* glue together f_p fragments */
992 if (!expchar) { /* %[fF] or sufficiently short %[gG] */
993 if (expt <= 0) {
994 PRINT(zeroes, 1);
995 if (prec || flags & ALT)
996 PRINT(decimal_point,decpt_len);
997 PAD(-expt, zeroes);
998 /* already handled initial 0's */
999 prec += expt;
1000 } else {
1001 if (gs.grouping) {
1002 n = grouping_print(&gs, &io,
1003 cp, dtoaend, locale);
1004 if (n < 0)
1005 goto error;
1006 cp += n;
1007 } else {
1008 PRINTANDPAD(cp, dtoaend,
1009 expt, zeroes);
1010 cp += expt;
1011 }
1012 if (prec || flags & ALT)
1013 PRINT(decimal_point,decpt_len);
1014 }
1015 PRINTANDPAD(cp, dtoaend, prec, zeroes);
1016 } else { /* %[eE] or sufficiently long %[gG] */
1017 if (prec > 1 || flags & ALT) {
1018 PRINT(cp++, 1);
1019 PRINT(decimal_point, decpt_len);
1020 PRINT(cp, ndig-1);
1021 PAD(prec - ndig, zeroes);
1022 } else /* XeYYY */
1023 PRINT(cp, 1);
1024 PRINT(expstr, expsize);
1025 }
1026 }
1027 #endif
1028 /* left-adjusting padding (always blank) */
1029 if (flags & LADJUST)
1030 PAD(width - realsz, blanks);
1031
1032 /* finally, adjust ret */
1033 ret += prsize;
1034
1035 FLUSH(); /* copy out the I/O vectors */
1036 }
1037 done:
1038 FLUSH();
1039 error:
1040 va_end(orgap);
1041 #ifndef NO_FLOATING_POINT
1042 if (dtoaresult != NULL)
1043 freedtoa(dtoaresult);
1044 #endif
1045 if (convbuf != NULL)
1046 free(convbuf);
1047 if (__sferror(fp))
1048 ret = EOF;
1049 else
1050 fp->_flags |= savserr;
1051 if ((argtable != NULL) && (argtable != statargtable))
1052 free (argtable);
1053 return (ret);
1054 /* NOTREACHED */
1055 }
1056
1057