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Remove unneeded .Pp before .Rs in various manual pages.
[dragonfly.git] / lib / libc / stdio / vfprintf.c
blob26b30a5bfecd5731451dfae3d917056e6ef250b3
1 /*-
2 * Copyright (c) 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Chris Torek.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)vfprintf.c 8.1 (Berkeley) 6/4/93
33 * $FreeBSD: src/lib/libc/stdio/vfprintf.c,v 1.90 2009/02/28 06:06:57 das Exp $
34 * $DragonFly: src/lib/libc/stdio/vfprintf.c,v 1.16 2006/07/05 15:04:54 joerg Exp $
35 */
36
37 /*
38 * Actual printf innards.
39 *
40 * This code is large and complicated...
41 */
42
43 #include "namespace.h"
44 #include <sys/types.h>
45
46 #include <ctype.h>
47 #include <limits.h>
48 #include <locale.h>
49 #include <stddef.h>
50 #include <stdint.h>
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 #include <wchar.h>
55 #include <printf.h>
56
57 #include <stdarg.h>
58 #include "un-namespace.h"
59
60 #include "libc_private.h"
61 #include "local.h"
62 #include "priv_stdio.h"
63 #include "printflocal.h"
64
65 static int __sprint(FILE *, struct __suio *);
66 static int __sbprintf(FILE *, const char *, va_list) __printflike(2, 0)
67 __noinline;
68 static char *__wcsconv(wchar_t *, int);
69
70 #define CHAR char
71 #include "printfcommon.h"
72
73 struct grouping_state {
74 char *thousands_sep; /* locale-specific thousands separator */
75 int thousep_len; /* length of thousands_sep */
76 const char *grouping; /* locale-specific numeric grouping rules */
77 int lead; /* sig figs before decimal or group sep */
78 int nseps; /* number of group separators with ' */
79 int nrepeats; /* number of repeats of the last group */
80 };
81
82 /*
83 * Initialize the thousands' grouping state in preparation to print a
84 * number with ndigits digits. This routine returns the total number
85 * of bytes that will be needed.
86 */
87 static int
88 grouping_init(struct grouping_state *gs, int ndigits)
89 {
90 struct lconv *locale;
91
92 locale = localeconv();
93 gs->grouping = locale->grouping;
94 gs->thousands_sep = locale->thousands_sep;
95 gs->thousep_len = strlen(gs->thousands_sep);
96
97 gs->nseps = gs->nrepeats = 0;
98 gs->lead = ndigits;
99 while (*gs->grouping != CHAR_MAX) {
100 if (gs->lead <= *gs->grouping)
101 break;
102 gs->lead -= *gs->grouping;
103 if (*(gs->grouping+1)) {
104 gs->nseps++;
105 gs->grouping++;
106 } else
107 gs->nrepeats++;
108 }
109 return ((gs->nseps + gs->nrepeats) * gs->thousep_len);
110 }
111
112 /*
113 * Print a number with thousands' separators.
114 */
115 static int
116 grouping_print(struct grouping_state *gs, struct io_state *iop,
117 const CHAR *cp, const CHAR *ep)
118 {
119 const CHAR *cp0 = cp;
120
121 if (io_printandpad(iop, cp, ep, gs->lead, zeroes))
122 return (-1);
123 cp += gs->lead;
124 while (gs->nseps > 0 || gs->nrepeats > 0) {
125 if (gs->nrepeats > 0)
126 gs->nrepeats--;
127 else {
128 gs->grouping--;
129 gs->nseps--;
130 }
131 if (io_print(iop, gs->thousands_sep, gs->thousep_len))
132 return (-1);
133 if (io_printandpad(iop, cp, ep, *gs->grouping, zeroes))
134 return (-1);
135 cp += *gs->grouping;
136 }
137 if (cp > ep)
138 cp = ep;
139 return (cp - cp0);
140 }
141
142 /*
143 * Flush out all the vectors defined by the given uio,
144 * then reset it so that it can be reused.
145 */
146 static int
147 __sprint(FILE *fp, struct __suio *uio)
148 {
149 int err;
150
151 if (uio->uio_resid == 0) {
152 uio->uio_iovcnt = 0;
153 return (0);
154 }
155 err = __sfvwrite(fp, uio);
156 uio->uio_resid = 0;
157 uio->uio_iovcnt = 0;
158 return (err);
159 }
160
161 /*
162 * Helper function for `fprintf to unbuffered unix file': creates a
163 * temporary buffer. We only work on write-only files; this avoids
164 * worries about ungetc buffers and so forth.
165 */
166 static int
167 __sbprintf(FILE *fp, const char *fmt, va_list ap)
168 {
169 int ret;
170 FILE fake;
171 unsigned char buf[BUFSIZ];
172
173 /* XXX This is probably not needed. */
174 if (prepwrite(fp) != 0)
175 return (EOF);
176
177 /* copy the important variables */
178 fake.pub._flags = fp->pub._flags & ~__SNBF;
179 fake.pub._fileno = fp->pub._fileno;
180 fake._cookie = fp->_cookie;
181 fake._write = fp->_write;
182 memcpy(WCIO_GET(&fake), WCIO_GET(fp), sizeof(struct wchar_io_data));
183
184 /* set up the buffer */
185 fake._bf._base = fake.pub._p = buf;
186 fake._bf._size = fake.pub._w = sizeof(buf);
187 fake.pub._lbfsize = 0; /* not actually used, but Just In Case */
188
189 /* do the work, then copy any error status */
190 ret = __vfprintf(&fake, fmt, ap);
191 if (ret >= 0 && __fflush(&fake))
192 ret = EOF;
193 if (fake.pub._flags & __SERR)
194 fp->pub._flags |= __SERR;
195 return (ret);
196 }
197
198 /*
199 * Convert a wide character string argument for the %ls format to a multibyte
200 * string representation. If not -1, prec specifies the maximum number of
201 * bytes to output, and also means that we can't assume that the wide char.
202 * string ends is null-terminated.
203 */
204 static char *
205 __wcsconv(wchar_t *wcsarg, int prec)
206 {
207 static const mbstate_t initial;
208 mbstate_t mbs;
209 char buf[MB_LEN_MAX];
210 wchar_t *p;
211 char *convbuf;
212 size_t clen, nbytes;
213
214 /* Allocate space for the maximum number of bytes we could output. */
215 if (prec < 0) {
216 p = wcsarg;
217 mbs = initial;
218 nbytes = wcsrtombs(NULL, (const wchar_t **)&p, 0, &mbs);
219 if (nbytes == (size_t)-1)
220 return (NULL);
221 } else {
222 /*
223 * Optimisation: if the output precision is small enough,
224 * just allocate enough memory for the maximum instead of
225 * scanning the string.
226 */
227 if (prec < 128) {
228 nbytes = prec;
229 } else {
230 nbytes = 0;
231 p = wcsarg;
232 mbs = initial;
233 for (;;) {
234 clen = wcrtomb(buf, *p++, &mbs);
235 if (clen == 0 || clen == (size_t)-1 ||
236 nbytes + clen > prec)
237 break;
238 nbytes += clen;
239 }
240 }
241 }
242 if ((convbuf = malloc(nbytes + 1)) == NULL)
243 return (NULL);
244
245 /* Fill the output buffer. */
246 p = wcsarg;
247 mbs = initial;
248 if ((nbytes = wcsrtombs(convbuf, (const wchar_t **)&p,
249 nbytes, &mbs)) == (size_t)-1) {
250 free(convbuf);
251 return (NULL);
252 }
253 convbuf[nbytes] = '\0';
254 return (convbuf);
255 }
256
257 /*
258 * MT-safe version
259 */
260 int
261 vfprintf(FILE * __restrict fp, const char * __restrict fmt0, va_list ap)
262 {
263 int ret;
264
265 FLOCKFILE(fp);
266 /* optimise fprintf(stderr) (and other unbuffered Unix files) */
267 if ((fp->pub._flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
268 fp->pub._fileno >= 0)
269 ret = __sbprintf(fp, fmt0, ap);
270 else
271 ret = __vfprintf(fp, fmt0, ap);
272 FUNLOCKFILE(fp);
273 return (ret);
274 }
275
276 /*
277 * The size of the buffer we use as scratch space for integer
278 * conversions, among other things. We need enough space to
279 * write a uintmax_t in octal (plus one byte).
280 */
281 #if UINTMAX_MAX <= UINT64_MAX
282 #define BUF 32
283 #else
284 #error "BUF must be large enough to format a uintmax_t"
285 #endif
286
287 /*
288 * Non-MT-safe version
289 */
290 int
291 __vfprintf(FILE *fp, const char *fmt0, va_list ap)
292 {
293 char *fmt; /* format string */
294 int ch; /* character from fmt */
295 int n, n2; /* handy integer (short term usage) */
296 char *cp; /* handy char pointer (short term usage) */
297 int flags; /* flags as above */
298 int ret; /* return value accumulator */
299 int width; /* width from format (%8d), or 0 */
300 int prec; /* precision from format; <0 for N/A */
301 char sign; /* sign prefix (' ', '+', '-', or \0) */
302 struct grouping_state gs; /* thousands' grouping info */
303
304 #ifndef NO_FLOATING_POINT
305 /*
306 * We can decompose the printed representation of floating
307 * point numbers into several parts, some of which may be empty:
308 *
309 * [+|-| ] [0x|0X] MMM . NNN [e|E|p|P] [+|-] ZZ
310 * A B ---C--- D E F
311 *
312 * A: 'sign' holds this value if present; '\0' otherwise
313 * B: ox[1] holds the 'x' or 'X'; '\0' if not hexadecimal
314 * C: cp points to the string MMMNNN. Leading and trailing
315 * zeros are not in the string and must be added.
316 * D: expchar holds this character; '\0' if no exponent, e.g. %f
317 * F: at least two digits for decimal, at least one digit for hex
318 */
319 char *decimal_point; /* locale specific decimal point */
320 int decpt_len; /* length of decimal_point */
321 int signflag; /* true if float is negative */
322 union { /* floating point arguments %[aAeEfFgG] */
323 double dbl;
324 long double ldbl;
325 } fparg;
326 int expt; /* integer value of exponent */
327 char expchar; /* exponent character: [eEpP\0] */
328 char *dtoaend; /* pointer to end of converted digits */
329 int expsize; /* character count for expstr */
330 int ndig; /* actual number of digits returned by dtoa */
331 char expstr[MAXEXPDIG+2]; /* buffer for exponent string: e+ZZZ */
332 char *dtoaresult; /* buffer allocated by dtoa */
333 #endif
334 u_long ulval; /* integer arguments %[diouxX] */
335 uintmax_t ujval; /* %j, %ll, %q, %t, %z integers */
336 int base; /* base for [diouxX] conversion */
337 int dprec; /* a copy of prec if [diouxX], 0 otherwise */
338 int realsz; /* field size expanded by dprec, sign, etc */
339 int size; /* size of converted field or string */
340 int prsize; /* max size of printed field */
341 const char *xdigs; /* digits for %[xX] conversion */
342 struct io_state io; /* I/O buffering state */
343 char buf[BUF]; /* buffer with space for digits of uintmax_t */
344 char ox[2]; /* space for 0x; ox[1] is either x, X, or \0 */
345 union arg *argtable; /* args, built due to positional arg */
346 union arg statargtable [STATIC_ARG_TBL_SIZE];
347 int nextarg; /* 1-based argument index */
348 va_list orgap; /* original argument pointer */
349 char *convbuf; /* wide to multibyte conversion result */
350
351 static const char xdigs_lower[16] = "0123456789abcdef";
352 static const char xdigs_upper[16] = "0123456789ABCDEF";
353
354 /* BEWARE, these `goto error' on error. */
355 #define PRINT(ptr, len) { \
356 if (io_print(&io, (ptr), (len))) \
357 goto error; \
358 }
359 #define PAD(howmany, with) { \
360 if (io_pad(&io, (howmany), (with))) \
361 goto error; \
362 }
363 #define PRINTANDPAD(p, ep, len, with) { \
364 if (io_printandpad(&io, (p), (ep), (len), (with))) \
365 goto error; \
366 }
367 #define FLUSH() { \
368 if (io_flush(&io)) \
369 goto error; \
370 }
371
372 /*
373 * Get the argument indexed by nextarg. If the argument table is
374 * built, use it to get the argument. If its not, get the next
375 * argument (and arguments must be gotten sequentially).
376 */
377 #define GETARG(type) \
378 ((argtable != NULL) ? *((type*)(&argtable[nextarg++])) : \
379 (nextarg++, va_arg(ap, type)))
380
381 /*
382 * To extend shorts properly, we need both signed and unsigned
383 * argument extraction methods.
384 */
385 #define SARG() \
386 (flags&LONGINT ? GETARG(long) : \
387 flags&SHORTINT ? (long)(short)GETARG(int) : \
388 flags&CHARINT ? (long)(signed char)GETARG(int) : \
389 (long)GETARG(int))
390 #define UARG() \
391 (flags&LONGINT ? GETARG(u_long) : \
392 flags&SHORTINT ? (u_long)(u_short)GETARG(int) : \
393 flags&CHARINT ? (u_long)(u_char)GETARG(int) : \
394 (u_long)GETARG(u_int))
395 #define INTMAX_SIZE (INTMAXT|SIZET|PTRDIFFT|LLONGINT)
396 #define SJARG() \
397 (flags&INTMAXT ? GETARG(intmax_t) : \
398 flags&SIZET ? (intmax_t)GETARG(ssize_t) : \
399 flags&PTRDIFFT ? (intmax_t)GETARG(ptrdiff_t) : \
400 (intmax_t)GETARG(long long))
401 #define UJARG() \
402 (flags&INTMAXT ? GETARG(uintmax_t) : \
403 flags&SIZET ? (uintmax_t)GETARG(size_t) : \
404 flags&PTRDIFFT ? (uintmax_t)GETARG(ptrdiff_t) : \
405 (uintmax_t)GETARG(unsigned long long))
406
407 /*
408 * Get * arguments, including the form *nn$. Preserve the nextarg
409 * that the argument can be gotten once the type is determined.
410 */
411 #define GETASTER(val) \
412 n2 = 0; \
413 cp = fmt; \
414 while (is_digit(*cp)) { \
415 n2 = 10 * n2 + to_digit(*cp); \
416 cp++; \
417 } \
418 if (*cp == '$') { \
419 int hold = nextarg; \
420 if (argtable == NULL) { \
421 argtable = statargtable; \
422 if (__find_arguments (fmt0, orgap, &argtable)) { \
423 ret = EOF; \
424 goto error; \
425 } \
426 } \
427 nextarg = n2; \
428 val = GETARG (int); \
429 nextarg = hold; \
430 fmt = ++cp; \
431 } else { \
432 val = GETARG (int); \
433 }
434
435 if (__use_xprintf == 0 && getenv("USE_XPRINTF"))
436 __use_xprintf = 1;
437 if (__use_xprintf > 0)
438 return (__xvprintf(fp, fmt0, ap));
439
440 /* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
441 if (prepwrite(fp) != 0)
442 return (EOF);
443
444 convbuf = NULL;
445 fmt = __DECONST(char *, fmt0);
446 argtable = NULL;
447 nextarg = 1;
448 va_copy(orgap, ap);
449 io_init(&io, fp);
450 ret = 0;
451 #ifndef NO_FLOATING_POINT
452 dtoaresult = NULL;
453 decimal_point = localeconv()->decimal_point;
454 /* The overwhelmingly common case is decpt_len == 1. */
455 decpt_len = (decimal_point[1] == '\0' ? 1 : strlen(decimal_point));
456 #endif
457
458 /*
459 * Scan the format for conversions (`%' character).
460 */
461 for (;;) {
462 for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
463 /* void */;
464 if ((n = fmt - cp) != 0) {
465 if ((unsigned)ret + n > INT_MAX) {
466 ret = EOF;
467 goto error;
468 }
469 PRINT(cp, n);
470 ret += n;
471 }
472 if (ch == '\0')
473 goto done;
474 fmt++; /* skip over '%' */
475
476 flags = 0;
477 dprec = 0;
478 width = 0;
479 prec = -1;
480 gs.grouping = NULL;
481 sign = '\0';
482 ox[1] = '\0';
483
484 rflag: ch = *fmt++;
485 reswitch: switch (ch) {
486 case ' ':
487 /*-
488 * ``If the space and + flags both appear, the space
489 * flag will be ignored.''
490 * -- ANSI X3J11
491 */
492 if (!sign)
493 sign = ' ';
494 goto rflag;
495 case '#':
496 flags |= ALT;
497 goto rflag;
498 case '*':
499 /*-
500 * ``A negative field width argument is taken as a
501 * - flag followed by a positive field width.''
502 * -- ANSI X3J11
503 * They don't exclude field widths read from args.
504 */
505 GETASTER(width);
506 if (width >= 0)
507 goto rflag;
508 width = -width;
509 /* FALLTHROUGH */
510 case '-':
511 flags |= LADJUST;
512 goto rflag;
513 case '+':
514 sign = '+';
515 goto rflag;
516 case '\'':
517 flags |= GROUPING;
518 goto rflag;
519 case '.':
520 if ((ch = *fmt++) == '*') {
521 GETASTER(prec);
522 goto rflag;
523 }
524 prec = 0;
525 while (is_digit(ch)) {
526 prec = 10 * prec + to_digit(ch);
527 ch = *fmt++;
528 }
529 goto reswitch;
530 case '0':
531 /*-
532 * ``Note that 0 is taken as a flag, not as the
533 * beginning of a field width.''
534 * -- ANSI X3J11
535 */
536 flags |= ZEROPAD;
537 goto rflag;
538 case '1': case '2': case '3': case '4':
539 case '5': case '6': case '7': case '8': case '9':
540 n = 0;
541 do {
542 n = 10 * n + to_digit(ch);
543 ch = *fmt++;
544 } while (is_digit(ch));
545 if (ch == '$') {
546 nextarg = n;
547 if (argtable == NULL) {
548 argtable = statargtable;
549 if (__find_arguments (fmt0, orgap,
550 &argtable)) {
551 ret = EOF;
552 goto error;
553 }
554 }
555 goto rflag;
556 }
557 width = n;
558 goto reswitch;
559 #ifndef NO_FLOATING_POINT
560 case 'L':
561 flags |= LONGDBL;
562 goto rflag;
563 #endif
564 case 'h':
565 if (flags & SHORTINT) {
566 flags &= ~SHORTINT;
567 flags |= CHARINT;
568 } else
569 flags |= SHORTINT;
570 goto rflag;
571 case 'j':
572 flags |= INTMAXT;
573 goto rflag;
574 case 'l':
575 if (flags & LONGINT) {
576 flags &= ~LONGINT;
577 flags |= LLONGINT;
578 } else
579 flags |= LONGINT;
580 goto rflag;
581 case 'q':
582 flags |= LLONGINT; /* not necessarily */
583 goto rflag;
584 case 't':
585 flags |= PTRDIFFT;
586 goto rflag;
587 case 'z':
588 flags |= SIZET;
589 goto rflag;
590 case 'C':
591 flags |= LONGINT;
592 /*FALLTHROUGH*/
593 case 'c':
594 if (flags & LONGINT) {
595 static const mbstate_t initial;
596 mbstate_t mbs;
597 size_t mbseqlen;
598
599 mbs = initial;
600 mbseqlen = wcrtomb(cp = buf,
601 (wchar_t)GETARG(wint_t), &mbs);
602 if (mbseqlen == (size_t)-1) {
603 fp->pub._flags |= __SERR;
604 goto error;
605 }
606 size = (int)mbseqlen;
607 } else {
608 *(cp = buf) = GETARG(int);
609 size = 1;
610 }
611 sign = '\0';
612 break;
613 case 'D':
614 flags |= LONGINT;
615 /*FALLTHROUGH*/
616 case 'd':
617 case 'i':
618 if (flags & INTMAX_SIZE) {
619 ujval = SJARG();
620 if ((intmax_t)ujval < 0) {
621 ujval = -ujval;
622 sign = '-';
623 }
624 } else {
625 ulval = SARG();
626 if ((long)ulval < 0) {
627 ulval = -ulval;
628 sign = '-';
629 }
630 }
631 base = 10;
632 goto number;
633 #ifndef NO_FLOATING_POINT
634 case 'a':
635 case 'A':
636 if (ch == 'a') {
637 ox[1] = 'x';
638 xdigs = xdigs_lower;
639 expchar = 'p';
640 } else {
641 ox[1] = 'X';
642 xdigs = xdigs_upper;
643 expchar = 'P';
644 }
645 if (prec >= 0)
646 prec++;
647 if (dtoaresult != NULL)
648 freedtoa(dtoaresult);
649 if (flags & LONGDBL) {
650 fparg.ldbl = GETARG(long double);
651 dtoaresult = cp =
652 __hldtoa(fparg.ldbl, xdigs, prec,
653 &expt, &signflag, &dtoaend);
654 } else {
655 fparg.dbl = GETARG(double);
656 dtoaresult = cp =
657 __hdtoa(fparg.dbl, xdigs, prec,
658 &expt, &signflag, &dtoaend);
659 }
660 if (prec < 0)
661 prec = dtoaend - cp;
662 if (expt == INT_MAX)
663 ox[1] = '\0';
664 goto fp_common;
665 case 'e':
666 case 'E':
667 expchar = ch;
668 if (prec < 0) /* account for digit before decpt */
669 prec = DEFPREC + 1;
670 else
671 prec++;
672 goto fp_begin;
673 case 'f':
674 case 'F':
675 expchar = '\0';
676 goto fp_begin;
677 case 'g':
678 case 'G':
679 expchar = ch - ('g' - 'e');
680 if (prec == 0)
681 prec = 1;
682 fp_begin:
683 if (prec < 0)
684 prec = DEFPREC;
685 if (dtoaresult != NULL)
686 freedtoa(dtoaresult);
687 if (flags & LONGDBL) {
688 fparg.ldbl = GETARG(long double);
689 dtoaresult = cp =
690 __ldtoa(&fparg.ldbl, expchar ? 2 : 3, prec,
691 &expt, &signflag, &dtoaend);
692 } else {
693 fparg.dbl = GETARG(double);
694 dtoaresult = cp =
695 dtoa(fparg.dbl, expchar ? 2 : 3, prec,
696 &expt, &signflag, &dtoaend);
697 if (expt == 9999)
698 expt = INT_MAX;
699 }
700 fp_common:
701 if (signflag)
702 sign = '-';
703 if (expt == INT_MAX) { /* inf or nan */
704 if (*cp == 'N') {
705 cp = (ch >= 'a') ? "nan" : "NAN";
706 sign = '\0';
707 } else
708 cp = (ch >= 'a') ? "inf" : "INF";
709 size = 3;
710 flags &= ~ZEROPAD;
711 break;
712 }
713 flags |= FPT;
714 ndig = dtoaend - cp;
715 if (ch == 'g' || ch == 'G') {
716 if (expt > -4 && expt <= prec) {
717 /* Make %[gG] smell like %[fF] */
718 expchar = '\0';
719 if (flags & ALT)
720 prec -= expt;
721 else
722 prec = ndig - expt;
723 if (prec < 0)
724 prec = 0;
725 } else {
726 /*
727 * Make %[gG] smell like %[eE], but
728 * trim trailing zeroes if no # flag.
729 */
730 if (!(flags & ALT))
731 prec = ndig;
732 }
733 }
734 if (expchar) {
735 expsize = exponent(expstr, expt - 1, expchar);
736 size = expsize + prec;
737 if (prec > 1 || flags & ALT)
738 size += decpt_len;
739 } else {
740 /* space for digits before decimal point */
741 if (expt > 0)
742 size = expt;
743 else /* "0" */
744 size = 1;
745 /* space for decimal pt and following digits */
746 if (prec || flags & ALT)
747 size += prec + decpt_len;
748 if ((flags & GROUPING) && expt > 0)
749 size += grouping_init(&gs, expt);
750 }
751 break;
752 #endif /* !NO_FLOATING_POINT */
753 case 'n':
754 /*
755 * Assignment-like behavior is specified if the
756 * value overflows or is otherwise unrepresentable.
757 * C99 says to use `signed char' for %hhn conversions.
758 */
759 if (flags & LLONGINT)
760 *GETARG(long long *) = ret;
761 else if (flags & SIZET)
762 *GETARG(ssize_t *) = (ssize_t)ret;
763 else if (flags & PTRDIFFT)
764 *GETARG(ptrdiff_t *) = ret;
765 else if (flags & INTMAXT)
766 *GETARG(intmax_t *) = ret;
767 else if (flags & LONGINT)
768 *GETARG(long *) = ret;
769 else if (flags & SHORTINT)
770 *GETARG(short *) = ret;
771 else if (flags & CHARINT)
772 *GETARG(signed char *) = ret;
773 else
774 *GETARG(int *) = ret;
775 continue; /* no output */
776 case 'O':
777 flags |= LONGINT;
778 /*FALLTHROUGH*/
779 case 'o':
780 if (flags & INTMAX_SIZE)
781 ujval = UJARG();
782 else
783 ulval = UARG();
784 base = 8;
785 goto nosign;
786 case 'p':
787 /*-
788 * ``The argument shall be a pointer to void. The
789 * value of the pointer is converted to a sequence
790 * of printable characters, in an implementation-
791 * defined manner.''
792 * -- ANSI X3J11
793 */
794 ujval = (uintmax_t)(uintptr_t)GETARG(void *);
795 base = 16;
796 xdigs = xdigs_lower;
797 flags = flags | INTMAXT;
798 ox[1] = 'x';
799 goto nosign;
800 case 'S':
801 flags |= LONGINT;
802 /*FALLTHROUGH*/
803 case 's':
804 if (flags & LONGINT) {
805 wchar_t *wcp;
806
807 if (convbuf != NULL)
808 free(convbuf);
809 if ((wcp = GETARG(wchar_t *)) == NULL)
810 cp = "(null)";
811 else {
812 convbuf = __wcsconv(wcp, prec);
813 if (convbuf == NULL) {
814 fp->pub._flags |= __SERR;
815 goto error;
816 }
817 cp = convbuf;
818 }
819 } else if ((cp = GETARG(char *)) == NULL)
820 cp = "(null)";
821 size = (prec >= 0) ? strnlen(cp, prec) : strlen(cp);
822 sign = '\0';
823 break;
824 case 'U':
825 flags |= LONGINT;
826 /*FALLTHROUGH*/
827 case 'u':
828 if (flags & INTMAX_SIZE)
829 ujval = UJARG();
830 else
831 ulval = UARG();
832 base = 10;
833 goto nosign;
834 case 'X':
835 xdigs = xdigs_upper;
836 goto hex;
837 case 'x':
838 xdigs = xdigs_lower;
839 hex:
840 if (flags & INTMAX_SIZE)
841 ujval = UJARG();
842 else
843 ulval = UARG();
844 base = 16;
845 /* leading 0x/X only if non-zero */
846 if (flags & ALT &&
847 (flags & INTMAX_SIZE ? ujval != 0 : ulval != 0))
848 ox[1] = ch;
849
850 flags &= ~GROUPING;
851 /* unsigned conversions */
852 nosign: sign = '\0';
853 /*-
854 * ``... diouXx conversions ... if a precision is
855 * specified, the 0 flag will be ignored.''
856 * -- ANSI X3J11
857 */
858 number: if ((dprec = prec) >= 0)
859 flags &= ~ZEROPAD;
860
861 /*-
862 * ``The result of converting a zero value with an
863 * explicit precision of zero is no characters.''
864 * -- ANSI X3J11
865 *
866 * ``The C Standard is clear enough as is. The call
867 * printf("%#.0o", 0) should print 0.''
868 * -- Defect Report #151
869 */
870 cp = buf + BUF;
871 if (flags & INTMAX_SIZE) {
872 if (ujval != 0 || prec != 0 ||
873 (flags & ALT && base == 8))
874 cp = __ujtoa(ujval, cp, base,
875 flags & ALT, xdigs);
876 } else {
877 if (ulval != 0 || prec != 0 ||
878 (flags & ALT && base == 8))
879 cp = __ultoa(ulval, cp, base,
880 flags & ALT, xdigs);
881 }
882 size = buf + BUF - cp;
883 if (size > BUF) /* should never happen */
884 abort();
885 if ((flags & GROUPING) && size != 0)
886 size += grouping_init(&gs, size);
887 break;
888 default: /* "%?" prints ?, unless ? is NUL */
889 if (ch == '\0')
890 goto done;
891 /* pretend it was %c with argument ch */
892 cp = buf;
893 *cp = ch;
894 size = 1;
895 sign = '\0';
896 break;
897 }
898
899 /*
900 * All reasonable formats wind up here. At this point, `cp'
901 * points to a string which (if not flags&LADJUST) should be
902 * padded out to `width' places. If flags&ZEROPAD, it should
903 * first be prefixed by any sign or other prefix; otherwise,
904 * it should be blank padded before the prefix is emitted.
905 * After any left-hand padding and prefixing, emit zeroes
906 * required by a decimal [diouxX] precision, then print the
907 * string proper, then emit zeroes required by any leftover
908 * floating precision; finally, if LADJUST, pad with blanks.
909 *
910 * Compute actual size, so we know how much to pad.
911 * size excludes decimal prec; realsz includes it.
912 */
913 realsz = dprec > size ? dprec : size;
914 if (sign)
915 realsz++;
916 if (ox[1])
917 realsz += 2;
918
919 prsize = width > realsz ? width : realsz;
920 if ((unsigned)ret + prsize > INT_MAX) {
921 ret = EOF;
922 goto error;
923 }
924
925 /* right-adjusting blank padding */
926 if ((flags & (LADJUST|ZEROPAD)) == 0)
927 PAD(width - realsz, blanks);
928
929 /* prefix */
930 if (sign)
931 PRINT(&sign, 1);
932
933 if (ox[1]) { /* ox[1] is either x, X, or \0 */
934 ox[0] = '0';
935 PRINT(ox, 2);
936 }
937
938 /* right-adjusting zero padding */
939 if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
940 PAD(width - realsz, zeroes);
941
942 /* the string or number proper */
943 #ifndef NO_FLOATING_POINT
944 if ((flags & FPT) == 0) {
945 #endif
946 /* leading zeroes from decimal precision */
947 PAD(dprec - size, zeroes);
948 if (gs.grouping) {
949 if (grouping_print(&gs, &io, cp, buf+BUF) < 0)
950 goto error;
951 } else {
952 PRINT(cp, size);
953 }
954 #ifndef NO_FLOATING_POINT
955 } else { /* glue together f_p fragments */
956 if (!expchar) { /* %[fF] or sufficiently short %[gG] */
957 if (expt <= 0) {
958 PRINT(zeroes, 1);
959 if (prec || flags & ALT)
960 PRINT(decimal_point,decpt_len);
961 PAD(-expt, zeroes);
962 /* already handled initial 0's */
963 prec += expt;
964 } else {
965 if (gs.grouping) {
966 n = grouping_print(&gs, &io,
967 cp, dtoaend);
968 if (n < 0)
969 goto error;
970 cp += n;
971 } else {
972 PRINTANDPAD(cp, dtoaend,
973 expt, zeroes);
974 cp += expt;
975 }
976 if (prec || flags & ALT)
977 PRINT(decimal_point,decpt_len);
978 }
979 PRINTANDPAD(cp, dtoaend, prec, zeroes);
980 } else { /* %[eE] or sufficiently long %[gG] */
981 if (prec > 1 || flags & ALT) {
982 PRINT(cp++, 1);
983 PRINT(decimal_point, decpt_len);
984 PRINT(cp, ndig-1);
985 PAD(prec - ndig, zeroes);
986 } else /* XeYYY */
987 PRINT(cp, 1);
988 PRINT(expstr, expsize);
989 }
990 }
991 #endif
992 /* left-adjusting padding (always blank) */
993 if (flags & LADJUST)
994 PAD(width - realsz, blanks);
995
996 /* finally, adjust ret */
997 ret += prsize;
998
999 FLUSH(); /* copy out the I/O vectors */
1000 }
1001 done:
1002 FLUSH();
1003 error:
1004 va_end(orgap);
1005 #ifndef NO_FLOATING_POINT
1006 if (dtoaresult != NULL)
1007 freedtoa(dtoaresult);
1008 #endif
1009 if (convbuf != NULL)
1010 free(convbuf);
1011 if (__sferror(fp))
1012 ret = EOF;
1013 if ((argtable != NULL) && (argtable != statargtable))
1014 free(argtable);
1015 return (ret);
1016 /* NOTREACHED */
1017 }
1018
DragonFly BSD