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