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platform_bionic/libc/stdio/vfprintf.c
Elliott Hughes 1d13c64d78 Fix %hhd formats in the printf family. 
Found by adapting the simple unit tests for libc logging to test
snprintf too. Fix taken from upstream OpenBSD without updating
the rest of stdio.

Change-Id: Ie339a8e9393a36080147aae4d6665118e5d93647
2013-09-23 16:02:39 -07:00

1329 lines
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/* $OpenBSD: vfprintf.c,v 1.37 2006/01/13 17:56:18 millert Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Actual printf innards.
*
* This code is large and complicated...
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <errno.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "local.h"
#include "fvwrite.h"
static void __find_arguments(const char *fmt0, va_list ap, va_list **argtable,
size_t *argtablesiz);
static int __grow_type_table(unsigned char **typetable, int *tablesize);
/*
* Flush out all the vectors defined by the given uio,
* then reset it so that it can be reused.
*/
static int
__sprint(FILE *fp, struct __suio *uio)
{
int err;
if (uio->uio_resid == 0) {
uio->uio_iovcnt = 0;
return (0);
}
err = __sfvwrite(fp, uio);
uio->uio_resid = 0;
uio->uio_iovcnt = 0;
return (err);
}
/*
* Helper function for `fprintf to unbuffered unix file': creates a
* temporary buffer. We only work on write-only files; this avoids
* worries about ungetc buffers and so forth.
*/
static int
__sbprintf(FILE *fp, const char *fmt, va_list ap)
{
int ret;
FILE fake;
struct __sfileext fakeext;
unsigned char buf[BUFSIZ];
_FILEEXT_SETUP(&fake, &fakeext);
/* copy the important variables */
fake._flags = fp->_flags & ~__SNBF;
fake._file = fp->_file;
fake._cookie = fp->_cookie;
fake._write = fp->_write;
/* set up the buffer */
fake._bf._base = fake._p = buf;
fake._bf._size = fake._w = sizeof(buf);
fake._lbfsize = 0; /* not actually used, but Just In Case */
/* do the work, then copy any error status */
ret = __vfprintf(&fake, fmt, ap);
if (ret >= 0 && __sflush(&fake))
ret = EOF;
if (fake._flags & __SERR)
fp->_flags |= __SERR;
return (ret);
}
#ifdef FLOATING_POINT
#include <locale.h>
#include <math.h>
#include "floatio.h"
#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
#define DEFPREC 6
static char *cvt(double, int, int, char *, int *, int, int *);
static int exponent(char *, int, int);
#else /* no FLOATING_POINT */
#define BUF 40
#endif /* FLOATING_POINT */
#define STATIC_ARG_TBL_SIZE 8 /* Size of static argument table. */
/* BIONIC: do not link libm for only two rather simple functions */
#ifdef FLOATING_POINT
static int _my_isinf(double);
static int _my_isnan(double);
#endif
/*
* Macros for converting digits to letters and vice versa
*/
#define to_digit(c) ((c) - '0')
#define is_digit(c) ((unsigned)to_digit(c) <= 9)
#define to_char(n) ((n) + '0')
/*
* Flags used during conversion.
*/
#define ALT 0x0001 /* alternate form */
#define HEXPREFIX 0x0002 /* add 0x or 0X prefix */
#define LADJUST 0x0004 /* left adjustment */
#define LONGDBL 0x0008 /* long double; unimplemented */
#define LONGINT 0x0010 /* long integer */
#define LLONGINT 0x0020 /* long long integer */
#define SHORTINT 0x0040 /* short integer */
#define ZEROPAD 0x0080 /* zero (as opposed to blank) pad */
#define FPT 0x0100 /* Floating point number */
#define PTRINT 0x0200 /* (unsigned) ptrdiff_t */
#define SIZEINT 0x0400 /* (signed) size_t */
#define CHARINT 0x0800 /* 8 bit integer */
#define MAXINT 0x1000 /* largest integer size (intmax_t) */
int
vfprintf(FILE *fp, const char *fmt0, __va_list ap)
{
int ret;
FLOCKFILE(fp);
ret = __vfprintf(fp, fmt0, ap);
FUNLOCKFILE(fp);
return (ret);
}
int
__vfprintf(FILE *fp, const char *fmt0, __va_list ap)
{
char *fmt; /* format string */
int ch; /* character from fmt */
int n, m, n2; /* handy integers (short term usage) */
char *cp; /* handy char pointer (short term usage) */
char *cp_free = NULL; /* BIONIC: copy of cp to be freed after usage */
struct __siov *iovp;/* for PRINT macro */
int flags; /* flags as above */
int ret; /* return value accumulator */
int width; /* width from format (%8d), or 0 */
int prec; /* precision from format (%.3d), or -1 */
char sign; /* sign prefix (' ', '+', '-', or \0) */
wchar_t wc;
void* ps;
#ifdef FLOATING_POINT
char *decimal_point = ".";
char softsign; /* temporary negative sign for floats */
double _double = 0.; /* double precision arguments %[eEfgG] */
int expt; /* integer value of exponent */
int expsize = 0; /* character count for expstr */
int ndig; /* actual number of digits returned by cvt */
char expstr[7]; /* buffer for exponent string */
#endif
uintmax_t _umax; /* integer arguments %[diouxX] */
enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
int realsz; /* field size expanded by dprec */
int size; /* size of converted field or string */
char* xdigs = NULL; /* digits for [xX] conversion */
#define NIOV 8
struct __suio uio; /* output information: summary */
struct __siov iov[NIOV];/* ... and individual io vectors */
char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
char ox[2]; /* space for 0x hex-prefix */
va_list *argtable; /* args, built due to positional arg */
va_list statargtable[STATIC_ARG_TBL_SIZE];
size_t argtablesiz;
int nextarg; /* 1-based argument index */
va_list orgap; /* original argument pointer */
/*
* Choose PADSIZE to trade efficiency vs. size. If larger printf
* fields occur frequently, increase PADSIZE and make the initialisers
* below longer.
*/
#define PADSIZE 16 /* pad chunk size */
static const char blanks[PADSIZE] =
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
static const char zeroes[PADSIZE] =
{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
/*
* BEWARE, these `goto error' on error, and PAD uses `n'.
*/
#define PRINT(ptr, len) do { \
iovp->iov_base = (ptr); \
iovp->iov_len = (len); \
uio.uio_resid += (len); \
iovp++; \
if (++uio.uio_iovcnt >= NIOV) { \
if (__sprint(fp, &uio)) \
goto error; \
iovp = iov; \
} \
} while (0)
#define PAD(howmany, with) do { \
if ((n = (howmany)) > 0) { \
while (n > PADSIZE) { \
PRINT(with, PADSIZE); \
n -= PADSIZE; \
} \
PRINT(with, n); \
} \
} while (0)
#define FLUSH() do { \
if (uio.uio_resid && __sprint(fp, &uio)) \
goto error; \
uio.uio_iovcnt = 0; \
iovp = iov; \
} while (0)
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \
((intmax_t)(flags&MAXINT ? GETARG(intmax_t) : \
flags&LLONGINT ? GETARG(long long) : \
flags&LONGINT ? GETARG(long) : \
flags&PTRINT ? GETARG(ptrdiff_t) : \
flags&SIZEINT ? GETARG(ssize_t) : \
flags&SHORTINT ? (short)GETARG(int) : \
flags&CHARINT ? (__signed char)GETARG(int) : \
GETARG(int)))
#define UARG() \
((uintmax_t)(flags&MAXINT ? GETARG(uintmax_t) : \
flags&LLONGINT ? GETARG(unsigned long long) : \
flags&LONGINT ? GETARG(unsigned long) : \
flags&PTRINT ? (uintptr_t)GETARG(ptrdiff_t) : /* XXX */ \
flags&SIZEINT ? GETARG(size_t) : \
flags&SHORTINT ? (unsigned short)GETARG(int) : \
flags&CHARINT ? (unsigned char)GETARG(int) : \
GETARG(unsigned int)))
/*
* Get * arguments, including the form *nn$. Preserve the nextarg
* that the argument can be gotten once the type is determined.
*/
#define GETASTER(val) \
n2 = 0; \
cp = fmt; \
while (is_digit(*cp)) { \
n2 = 10 * n2 + to_digit(*cp); \
cp++; \
} \
if (*cp == '$') { \
int hold = nextarg; \
if (argtable == NULL) { \
argtable = statargtable; \
__find_arguments(fmt0, orgap, &argtable, &argtablesiz); \
} \
nextarg = n2; \
val = GETARG(int); \
nextarg = hold; \
fmt = ++cp; \
} else { \
val = GETARG(int); \
}
/*
* Get the argument indexed by nextarg. If the argument table is
* built, use it to get the argument. If its not, get the next
* argument (and arguments must be gotten sequentially).
*/
#define GETARG(type) \
(((argtable != NULL) ? (void)(ap = argtable[nextarg]) : (void)0), \
nextarg++, va_arg(ap, type))
_SET_ORIENTATION(fp, -1);
/* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
if (cantwrite(fp)) {
errno = EBADF;
return (EOF);
}
/* optimise fprintf(stderr) (and other unbuffered Unix files) */
if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
fp->_file >= 0)
return (__sbprintf(fp, fmt0, ap));
fmt = (char *)fmt0;
argtable = NULL;
nextarg = 1;
va_copy(orgap, ap);
uio.uio_iov = iovp = iov;
uio.uio_resid = 0;
uio.uio_iovcnt = 0;
ret = 0;
memset(&ps, 0, sizeof(ps));
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
cp = fmt;
#if 1 /* BIONIC */
n = -1;
while ( (wc = *fmt) != 0 ) {
if (wc == '%') {
n = 1;
break;
}
fmt++;
}
#else
while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) {
fmt += n;
if (wc == '%') {
fmt--;
break;
}
}
#endif
if ((m = fmt - cp) != 0) {
PRINT(cp, m);
ret += m;
}
if (n <= 0)
goto done;
fmt++; /* skip over '%' */
flags = 0;
dprec = 0;
width = 0;
prec = -1;
sign = '\0';
rflag: ch = *fmt++;
reswitch: switch (ch) {
case ' ':
/*
* ``If the space and + flags both appear, the space
* flag will be ignored.''
* -- ANSI X3J11
*/
if (!sign)
sign = ' ';
goto rflag;
case '#':
flags |= ALT;
goto rflag;
case '*':
/*
* ``A negative field width argument is taken as a
* - flag followed by a positive field width.''
* -- ANSI X3J11
* They don't exclude field widths read from args.
*/
GETASTER(width);
if (width >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
case '-':
flags |= LADJUST;
goto rflag;
case '+':
sign = '+';
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
GETASTER(n);
prec = n < 0 ? -1 : n;
goto rflag;
}
n = 0;
while (is_digit(ch)) {
n = 10 * n + to_digit(ch);
ch = *fmt++;
}
if (ch == '$') {
nextarg = n;
if (argtable == NULL) {
argtable = statargtable;
__find_arguments(fmt0, orgap,
&argtable, &argtablesiz);
}
goto rflag;
}
prec = n < 0 ? -1 : n;
goto reswitch;
case '0':
/*
* ``Note that 0 is taken as a flag, not as the
* beginning of a field width.''
* -- ANSI X3J11
*/
flags |= ZEROPAD;
goto rflag;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = 0;
do {
n = 10 * n + to_digit(ch);
ch = *fmt++;
} while (is_digit(ch));
if (ch == '$') {
nextarg = n;
if (argtable == NULL) {
argtable = statargtable;
__find_arguments(fmt0, orgap,
&argtable, &argtablesiz);
}
goto rflag;
}
width = n;
goto reswitch;
#ifdef FLOATING_POINT
case 'L':
flags |= LONGDBL;
goto rflag;
#endif
case 'h':
if (*fmt == 'h') {
fmt++;
flags |= CHARINT;
} else {
flags |= SHORTINT;
}
goto rflag;
case 'j':
flags |= MAXINT;
goto rflag;
case 'l':
if (*fmt == 'l') {
fmt++;
flags |= LLONGINT;
} else {
flags |= LONGINT;
}
goto rflag;
case 'q':
flags |= LLONGINT;
goto rflag;
case 't':
flags |= PTRINT;
goto rflag;
case 'z':
flags |= SIZEINT;
goto rflag;
case 'c':
*(cp = buf) = GETARG(int);
size = 1;
sign = '\0';
break;
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
_umax = SARG();
if ((intmax_t)_umax < 0) {
_umax = -_umax;
sign = '-';
}
base = DEC;
goto number;
#ifdef FLOATING_POINT
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
if (prec == -1) {
prec = DEFPREC;
} else if ((ch == 'g' || ch == 'G') && prec == 0) {
prec = 1;
}
if (flags & LONGDBL) {
_double = (double) GETARG(long double);
} else {
_double = GETARG(double);
}
/* do this before tricky precision changes */
if (_my_isinf(_double)) {
if (_double < 0)
sign = '-';
cp = "Inf";
size = 3;
break;
}
if (_my_isnan(_double)) {
cp = "NaN";
size = 3;
break;
}
flags |= FPT;
cp = cvt(_double, prec, flags, &softsign,
&expt, ch, &ndig);
cp_free = cp;
if (ch == 'g' || ch == 'G') {
if (expt <= -4 || expt > prec)
ch = (ch == 'g') ? 'e' : 'E';
else
ch = 'g';
}
if (ch <= 'e') { /* 'e' or 'E' fmt */
--expt;
expsize = exponent(expstr, expt, ch);
size = expsize + ndig;
if (ndig > 1 || flags & ALT)
++size;
} else if (ch == 'f') { /* f fmt */
if (expt > 0) {
size = expt;
if (prec || flags & ALT)
size += prec + 1;
} else /* "0.X" */
size = prec + 2;
} else if (expt >= ndig) { /* fixed g fmt */
size = expt;
if (flags & ALT)
++size;
} else
size = ndig + (expt > 0 ?
1 : 2 - expt);
if (softsign)
sign = '-';
break;
#endif /* FLOATING_POINT */
/* the Android security team suggests removing support for %n
* since it has no real practical value, and could lead to
* running malicious code (for really buggy programs that
* send to printf() user-generated formatting strings).
*/
#if 0
case 'n':
if (flags & LLONGINT)
*GETARG(long long *) = ret;
else if (flags & LONGINT)
*GETARG(long *) = ret;
else if (flags & SHORTINT)
*GETARG(short *) = ret;
else if (flags & CHARINT)
*GETARG(__signed char *) = ret;
else if (flags & PTRINT)
*GETARG(ptrdiff_t *) = ret;
else if (flags & SIZEINT)
*GETARG(ssize_t *) = ret;
else if (flags & MAXINT)
*GETARG(intmax_t *) = ret;
else
*GETARG(int *) = ret;
continue; /* no output */
#endif
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
_umax = UARG();
base = OCT;
goto nosign;
case 'p':
/*
* ``The argument shall be a pointer to void. The
* value of the pointer is converted to a sequence
* of printable characters, in an implementation-
* defined manner.''
* -- ANSI X3J11
*/
/* NOSTRICT */
_umax = (u_long)GETARG(void *);
base = HEX;
xdigs = "0123456789abcdef";
flags |= HEXPREFIX;
ch = 'x';
goto nosign;
case 's':
if ((cp = GETARG(char *)) == NULL)
cp = "(null)";
if (prec >= 0) {
/*
* can't use strlen; can only look for the
* NUL in the first `prec' characters, and
* strlen() will go further.
*/
char *p = memchr(cp, 0, prec);
if (p != NULL) {
size = p - cp;
if (size > prec)
size = prec;
} else
size = prec;
} else
size = strlen(cp);
sign = '\0';
break;
case 'U':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'u':
_umax = UARG();
base = DEC;
goto nosign;
case 'X':
xdigs = "0123456789ABCDEF";
goto hex;
case 'x':
xdigs = "0123456789abcdef";
hex: _umax = UARG();
base = HEX;
/* leading 0x/X only if non-zero */
if (flags & ALT && _umax != 0)
flags |= HEXPREFIX;
/* unsigned conversions */
nosign: sign = '\0';
/*
* ``... diouXx conversions ... if a precision is
* specified, the 0 flag will be ignored.''
* -- ANSI X3J11
*/
number: if ((dprec = prec) >= 0)
flags &= ~ZEROPAD;
/*
* ``The result of converting a zero value with an
* explicit precision of zero is no characters.''
* -- ANSI X3J11
*/
cp = buf + BUF;
if (_umax != 0 || prec != 0) {
/*
* Unsigned mod is hard, and unsigned mod
* by a constant is easier than that by
* a variable; hence this switch.
*/
switch (base) {
case OCT:
do {
*--cp = to_char(_umax & 7);
_umax >>= 3;
} while (_umax);
/* handle octal leading 0 */
if (flags & ALT && *cp != '0')
*--cp = '0';
break;
case DEC:
/* many numbers are 1 digit */
while (_umax >= 10) {
*--cp = to_char(_umax % 10);
_umax /= 10;
}
*--cp = to_char(_umax);
break;
case HEX:
do {
*--cp = xdigs[_umax & 15];
_umax >>= 4;
} while (_umax);
break;
default:
cp = "bug in vfprintf: bad base";
size = strlen(cp);
goto skipsize;
}
}
size = buf + BUF - cp;
skipsize:
break;
default: /* "%?" prints ?, unless ? is NUL */
if (ch == '\0')
goto done;
/* pretend it was %c with argument ch */
cp = buf;
*cp = ch;
size = 1;
sign = '\0';
break;
}
/*
* All reasonable formats wind up here. At this point, `cp'
* points to a string which (if not flags&LADJUST) should be
* padded out to `width' places. If flags&ZEROPAD, it should
* first be prefixed by any sign or other prefix; otherwise,
* it should be blank padded before the prefix is emitted.
* After any left-hand padding and prefixing, emit zeroes
* required by a decimal [diouxX] precision, then print the
* string proper, then emit zeroes required by any leftover
* floating precision; finally, if LADJUST, pad with blanks.
*
* Compute actual size, so we know how much to pad.
* size excludes decimal prec; realsz includes it.
*/
realsz = dprec > size ? dprec : size;
if (sign)
realsz++;
else if (flags & HEXPREFIX)
realsz+= 2;
/* right-adjusting blank padding */
if ((flags & (LADJUST|ZEROPAD)) == 0)
PAD(width - realsz, blanks);
/* prefix */
if (sign) {
PRINT(&sign, 1);
} else if (flags & HEXPREFIX) {
ox[0] = '0';
ox[1] = ch;
PRINT(ox, 2);
}
/* right-adjusting zero padding */
if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
PAD(width - realsz, zeroes);
/* leading zeroes from decimal precision */
PAD(dprec - size, zeroes);
/* the string or number proper */
#ifdef FLOATING_POINT
if ((flags & FPT) == 0) {
PRINT(cp, size);
} else { /* glue together f_p fragments */
if (ch >= 'f') { /* 'f' or 'g' */
if (_double == 0) {
/* kludge for __dtoa irregularity */
PRINT("0", 1);
if (expt < ndig || (flags & ALT) != 0) {
PRINT(decimal_point, 1);
PAD(ndig - 1, zeroes);
}
} else if (expt <= 0) {
PRINT("0", 1);
PRINT(decimal_point, 1);
PAD(-expt, zeroes);
PRINT(cp, ndig);
} else if (expt >= ndig) {
PRINT(cp, ndig);
PAD(expt - ndig, zeroes);
if (flags & ALT)
PRINT(".", 1);
} else {
PRINT(cp, expt);
cp += expt;
PRINT(".", 1);
PRINT(cp, ndig-expt);
}
} else { /* 'e' or 'E' */
if (ndig > 1 || flags & ALT) {
ox[0] = *cp++;
ox[1] = '.';
PRINT(ox, 2);
if (_double) {
PRINT(cp, ndig-1);
} else /* 0.[0..] */
/* __dtoa irregularity */
PAD(ndig - 1, zeroes);
} else /* XeYYY */
PRINT(cp, 1);
PRINT(expstr, expsize);
}
}
#else
PRINT(cp, size);
#endif
/* left-adjusting padding (always blank) */
if (flags & LADJUST)
PAD(width - realsz, blanks);
/* finally, adjust ret */
ret += width > realsz ? width : realsz;
FLUSH(); /* copy out the I/O vectors */
#if 1 /* BIONIC: remove memory leak when printing doubles */
if (cp_free) {
free(cp_free);
cp_free = NULL;
}
#endif
}
done:
FLUSH();
error:
#if 1 /* BIONIC: remove memory leak when printing doubles */
if (cp_free) {
free(cp_free);
cp_free = NULL;
}
#endif
if (argtable != NULL && argtable != statargtable) {
munmap(argtable, argtablesiz);
argtable = NULL;
}
va_end(orgap);
return (__sferror(fp) ? EOF : ret);
/* NOTREACHED */
}
/*
* Type ids for argument type table.
*/
#define T_UNUSED 0
#define T_SHORT 1
#define T_U_SHORT 2
#define TP_SHORT 3
#define T_INT 4
#define T_U_INT 5
#define TP_INT 6
#define T_LONG 7
#define T_U_LONG 8
#define TP_LONG 9
#define T_LLONG 10
#define T_U_LLONG 11
#define TP_LLONG 12
#define T_DOUBLE 13
#define T_LONG_DOUBLE 14
#define TP_CHAR 15
#define TP_VOID 16
#define T_PTRINT 17
#define TP_PTRINT 18
#define T_SIZEINT 19
#define T_SSIZEINT 20
#define TP_SSIZEINT 21
#define T_MAXINT 22
#define T_MAXUINT 23
#define TP_MAXINT 24
/*
* Find all arguments when a positional parameter is encountered. Returns a
* table, indexed by argument number, of pointers to each arguments. The
* initial argument table should be an array of STATIC_ARG_TBL_SIZE entries.
* It will be replaced with a mmap-ed one if it overflows (malloc cannot be
* used since we are attempting to make snprintf thread safe, and alloca is
* problematic since we have nested functions..)
*/
static void
__find_arguments(const char *fmt0, va_list ap, va_list **argtable,
size_t *argtablesiz)
{
char *fmt; /* format string */
int ch; /* character from fmt */
int n, n2; /* handy integer (short term usage) */
char *cp; /* handy char pointer (short term usage) */
int flags; /* flags as above */
unsigned char *typetable; /* table of types */
unsigned char stattypetable[STATIC_ARG_TBL_SIZE];
int tablesize; /* current size of type table */
int tablemax; /* largest used index in table */
int nextarg; /* 1-based argument index */
wchar_t wc;
void* ps;
/*
* Add an argument type to the table, expanding if necessary.
*/
#define ADDTYPE(type) \
((nextarg >= tablesize) ? \
__grow_type_table(&typetable, &tablesize) : 0, \
(nextarg > tablemax) ? tablemax = nextarg : 0, \
typetable[nextarg++] = type)
#define ADDSARG() \
((flags&MAXINT) ? ADDTYPE(T_MAXINT) : \
((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
((flags&SIZEINT) ? ADDTYPE(T_SSIZEINT) : \
((flags&LLONGINT) ? ADDTYPE(T_LLONG) : \
((flags&LONGINT) ? ADDTYPE(T_LONG) : \
((flags&SHORTINT) ? ADDTYPE(T_SHORT) : ADDTYPE(T_INT)))))))
#define ADDUARG() \
((flags&MAXINT) ? ADDTYPE(T_MAXUINT) : \
((flags&PTRINT) ? ADDTYPE(T_PTRINT) : \
((flags&SIZEINT) ? ADDTYPE(T_SIZEINT) : \
((flags&LLONGINT) ? ADDTYPE(T_U_LLONG) : \
((flags&LONGINT) ? ADDTYPE(T_U_LONG) : \
((flags&SHORTINT) ? ADDTYPE(T_U_SHORT) : ADDTYPE(T_U_INT)))))))
/*
* Add * arguments to the type array.
*/
#define ADDASTER() \
n2 = 0; \
cp = fmt; \
while (is_digit(*cp)) { \
n2 = 10 * n2 + to_digit(*cp); \
cp++; \
} \
if (*cp == '$') { \
int hold = nextarg; \
nextarg = n2; \
ADDTYPE(T_INT); \
nextarg = hold; \
fmt = ++cp; \
} else { \
ADDTYPE(T_INT); \
}
fmt = (char *)fmt0;
typetable = stattypetable;
tablesize = STATIC_ARG_TBL_SIZE;
tablemax = 0;
nextarg = 1;
memset(typetable, T_UNUSED, STATIC_ARG_TBL_SIZE);
memset(&ps, 0, sizeof(ps));
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
cp = fmt;
#if 1 /* BIONIC */
n = -1;
while ((wc = *fmt) != 0) {
if (wc == '%') {
n = 1;
break;
}
fmt++;
}
#else
while ((n = mbrtowc(&wc, fmt, MB_CUR_MAX, &ps)) > 0) {
fmt += n;
if (wc == '%') {
fmt--;
break;
}
}
#endif
if (n <= 0)
goto done;
fmt++; /* skip over '%' */
flags = 0;
rflag: ch = *fmt++;
reswitch: switch (ch) {
case ' ':
case '#':
goto rflag;
case '*':
ADDASTER();
goto rflag;
case '-':
case '+':
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
ADDASTER();
goto rflag;
}
while (is_digit(ch)) {
ch = *fmt++;
}
goto reswitch;
case '0':
goto rflag;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
n = 0;
do {
n = 10 * n + to_digit(ch);
ch = *fmt++;
} while (is_digit(ch));
if (ch == '$') {
nextarg = n;
goto rflag;
}
goto reswitch;
#ifdef FLOATING_POINT
case 'L':
flags |= LONGDBL;
goto rflag;
#endif
case 'h':
if (*fmt == 'h') {
fmt++;
flags |= CHARINT;
} else {
flags |= SHORTINT;
}
goto rflag;
case 'l':
if (*fmt == 'l') {
fmt++;
flags |= LLONGINT;
} else {
flags |= LONGINT;
}
goto rflag;
case 'q':
flags |= LLONGINT;
goto rflag;
case 't':
flags |= PTRINT;
goto rflag;
case 'z':
flags |= SIZEINT;
goto rflag;
case 'c':
ADDTYPE(T_INT);
break;
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
ADDSARG();
break;
#ifdef FLOATING_POINT
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
if (flags & LONGDBL)
ADDTYPE(T_LONG_DOUBLE);
else
ADDTYPE(T_DOUBLE);
break;
#endif /* FLOATING_POINT */
case 'n':
if (flags & LLONGINT)
ADDTYPE(TP_LLONG);
else if (flags & LONGINT)
ADDTYPE(TP_LONG);
else if (flags & SHORTINT)
ADDTYPE(TP_SHORT);
else if (flags & PTRINT)
ADDTYPE(TP_PTRINT);
else if (flags & SIZEINT)
ADDTYPE(TP_SSIZEINT);
else if (flags & MAXINT)
ADDTYPE(TP_MAXINT);
else
ADDTYPE(TP_INT);
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
ADDUARG();
break;
case 'p':
ADDTYPE(TP_VOID);
break;
case 's':
ADDTYPE(TP_CHAR);
break;
case 'U':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'u':
case 'X':
case 'x':
ADDUARG();
break;
default: /* "%?" prints ?, unless ? is NUL */
if (ch == '\0')
goto done;
break;
}
}
done:
/*
* Build the argument table.
*/
if (tablemax >= STATIC_ARG_TBL_SIZE) {
*argtablesiz = sizeof (va_list) * (tablemax + 1);
*argtable = (va_list *)mmap(NULL, *argtablesiz,
PROT_WRITE|PROT_READ, MAP_ANON|MAP_PRIVATE, -1, 0);
}
#if 0
/* XXX is this required? */
(*argtable) [0] = NULL;
#endif
for (n = 1; n <= tablemax; n++) {
va_copy((*argtable)[n], ap);
switch (typetable[n]) {
case T_UNUSED:
(void) va_arg(ap, int);
break;
case T_SHORT:
(void) va_arg(ap, int);
break;
case T_U_SHORT:
(void) va_arg(ap, int);
break;
case TP_SHORT:
(void) va_arg(ap, short *);
break;
case T_INT:
(void) va_arg(ap, int);
break;
case T_U_INT:
(void) va_arg(ap, unsigned int);
break;
case TP_INT:
(void) va_arg(ap, int *);
break;
case T_LONG:
(void) va_arg(ap, long);
break;
case T_U_LONG:
(void) va_arg(ap, unsigned long);
break;
case TP_LONG:
(void) va_arg(ap, long *);
break;
case T_LLONG:
(void) va_arg(ap, long long);
break;
case T_U_LLONG:
(void) va_arg(ap, unsigned long long);
break;
case TP_LLONG:
(void) va_arg(ap, long long *);
break;
case T_DOUBLE:
(void) va_arg(ap, double);
break;
case T_LONG_DOUBLE:
(void) va_arg(ap, long double);
break;
case TP_CHAR:
(void) va_arg(ap, char *);
break;
case TP_VOID:
(void) va_arg(ap, void *);
break;
case T_PTRINT:
(void) va_arg(ap, ptrdiff_t);
break;
case TP_PTRINT:
(void) va_arg(ap, ptrdiff_t *);
break;
case T_SIZEINT:
(void) va_arg(ap, size_t);
break;
case T_SSIZEINT:
(void) va_arg(ap, ssize_t);
break;
case TP_SSIZEINT:
(void) va_arg(ap, ssize_t *);
break;
case TP_MAXINT:
(void) va_arg(ap, intmax_t *);
break;
}
}
if (typetable != NULL && typetable != stattypetable) {
munmap(typetable, *argtablesiz);
typetable = NULL;
}
}
/*
* Increase the size of the type table.
*/
static int
__grow_type_table(unsigned char **typetable, int *tablesize)
{
unsigned char *oldtable = *typetable;
int newsize = *tablesize * 2;
if (*tablesize == STATIC_ARG_TBL_SIZE) {
*typetable = (unsigned char *)mmap(NULL,
sizeof (unsigned char) * newsize, PROT_WRITE|PROT_READ,
MAP_ANON|MAP_PRIVATE, -1, 0);
/* XXX unchecked */
memcpy( *typetable, oldtable, *tablesize);
} else {
unsigned char *new = (unsigned char *)mmap(NULL,
sizeof (unsigned char) * newsize, PROT_WRITE|PROT_READ,
MAP_ANON|MAP_PRIVATE, -1, 0);
memmove(new, *typetable, *tablesize);
munmap(*typetable, *tablesize);
*typetable = new;
/* XXX unchecked */
}
memset(*typetable + *tablesize, T_UNUSED, (newsize - *tablesize));
*tablesize = newsize;
return(0);
}
#ifdef FLOATING_POINT
extern char *__dtoa(double, int, int, int *, int *, char **);
static char *
cvt(double value, int ndigits, int flags, char *sign, int *decpt, int ch,
int *length)
{
int mode, dsgn;
char *digits, *bp, *rve;
if (ch == 'f') {
mode = 3; /* ndigits after the decimal point */
} else {
/* To obtain ndigits after the decimal point for the 'e'
* and 'E' formats, round to ndigits + 1 significant
* figures.
*/
if (ch == 'e' || ch == 'E') {
ndigits++;
}
mode = 2; /* ndigits significant digits */
}
if (value < 0) {
value = -value;
*sign = '-';
} else
*sign = '\000';
digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
if ((ch != 'g' && ch != 'G') || flags & ALT) { /* Print trailing zeros */
bp = digits + ndigits;
if (ch == 'f') {
if (*digits == '0' && value)
*decpt = -ndigits + 1;
bp += *decpt;
}
if (value == 0) /* kludge for __dtoa irregularity */
rve = bp;
while (rve < bp)
*rve++ = '0';
}
*length = rve - digits;
return (digits);
}
static int
exponent(char *p0, int exp, int fmtch)
{
char *p, *t;
char expbuf[MAXEXP];
p = p0;
*p++ = fmtch;
if (exp < 0) {
exp = -exp;
*p++ = '-';
}
else
*p++ = '+';
t = expbuf + MAXEXP;
if (exp > 9) {
do {
*--t = to_char(exp % 10);
} while ((exp /= 10) > 9);
*--t = to_char(exp);
for (; t < expbuf + MAXEXP; *p++ = *t++);
}
else {
*p++ = '0';
*p++ = to_char(exp);
}
return (p - p0);
}
/* BIONIC */
#include <machine/ieee.h>
typedef union {
double d;
struct ieee_double i;
} ieee_u;
static int
_my_isinf (double value)
{
ieee_u u;
u.d = value;
return (u.i.dbl_exp == 2047 && u.i.dbl_frach == 0 && u.i.dbl_fracl == 0);
}
static int
_my_isnan (double value)
{
ieee_u u;
u.d = value;
return (u.i.dbl_exp == 2047 && (u.i.dbl_frach != 0 || u.i.dbl_fracl != 0));
}
#endif /* FLOATING_POINT */
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