vsnprintf.c
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/*-
* Copyright (c) 1990, 1993
* 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.
*/
/*
* IMPORTANT NOTE:
* --------------
* From ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
* paragraph 3 above is now null and void.
*/
/* SNPRINTF.C
* fjc 7-31-97 Modified by Mib Software to be a standalone snprintf.c module.
* http://www.mibsoftware.com
* Mib Software does not warrant this software any differently than the
* University of California, Berkeley as described above. All warranties
* are disclaimed. Use this software at your own risk.
*
* All code referencing FILE * functions was eliminated, since it could
* never be called. All header files and necessary files are collapsed
* into one file, internal functions are declared static. This should
* allow inclusion into libraries with less chance of namespace collisions.
*
* snprintf should be the only externally visible item.
*
* As of 7-31-97 FLOATING_POINT is NOT provided. The code is somewhat
* non-portable, so it is disabled.
*/
/* Define FLOATING_POINT to get floating point. */
/*
#define FLOATING_POINT
*/
#include <sys/types.h>
#define u_long unsigned long
#define u_short unsigned short
#define u_int unsigned int
#if !defined(HAVE_STDARG_PROTOTYPES)
#if defined(__STDC__)
#define HAVE_STDARG_PROTOTYPES 1
#endif
#endif
#undef __P
#if defined(HAVE_STDARG_PROTOTYPES)
# include <stdarg.h>
# if !defined(__P)
# define __P(x) x
# endif
#else
# define __P(x) ()
# if !defined(const)
# define const
# endif
# include <varargs.h>
#endif
#ifndef _BSD_VA_LIST_
#define _BSD_VA_LIST_ va_list
#endif
#ifdef __STDC__
# include <limits.h>
#else
# ifndef LONG_MAX
# ifdef HAVE_LIMITS_H
# include <limits.h>
# else
/* assuming 32bit(2's compliment) long */
# define LONG_MAX 2147483647
# endif
# endif
#endif
#if defined(__hpux) && !defined(__GNUC__) && !defined(__STDC__)
#define const
#endif
#if defined(sgi)
#undef __const
#define __const
#endif /* People who don't like const sys_error */
#include <stddef.h>
#if defined(__hpux) && !defined(__GNUC__) || defined(__DECC)
#include <string.h>
#endif
#if !defined(__CYGWIN32__) && defined(__hpux) && !defined(__GNUC__)
#include <stdlib.h>
#endif
#ifndef NULL
#define NULL 0
#endif
#if SIZEOF_LONG > SIZEOF_INT
# include <errno.h>
#endif
#if __GNUC__ >= 3
#define UNINITIALIZED_VAR(x) x = x
#else
#define UNINITIALIZED_VAR(x) x
#endif
/*
* NB: to fit things in six character monocase externals, the stdio
* code uses the prefix `__s' for stdio objects, typically followed
* by a three-character attempt at a mnemonic.
*/
/* stdio buffers */
struct __sbuf {
unsigned char *_base;
size_t _size;
};
/*
* stdio state variables.
*
* The following always hold:
*
* if (_flags&(__SLBF|__SWR)) == (__SLBF|__SWR),
* _lbfsize is -_bf._size, else _lbfsize is 0
* if _flags&__SRD, _w is 0
* if _flags&__SWR, _r is 0
*
* This ensures that the getc and putc macros (or inline functions) never
* try to write or read from a file that is in `read' or `write' mode.
* (Moreover, they can, and do, automatically switch from read mode to
* write mode, and back, on "r+" and "w+" files.)
*
* _lbfsize is used only to make the inline line-buffered output stream
* code as compact as possible.
*
* _ub, _up, and _ur are used when ungetc() pushes back more characters
* than fit in the current _bf, or when ungetc() pushes back a character
* that does not match the previous one in _bf. When this happens,
* _ub._base becomes non-nil (i.e., a stream has ungetc() data iff
* _ub._base!=NULL) and _up and _ur save the current values of _p and _r.
*
* NB: see WARNING above before changing the layout of this structure!
*/
typedef struct __sFILE {
unsigned char *_p; /* current position in (some) buffer */
#if 0
size_t _r; /* read space left for getc() */
#endif
size_t _w; /* write space left for putc() */
short _flags; /* flags, below; this FILE is free if 0 */
short _file; /* fileno, if Unix descriptor, else -1 */
struct __sbuf _bf; /* the buffer (at least 1 byte, if !NULL) */
size_t _lbfsize; /* 0 or -_bf._size, for inline putc */
int (*vwrite)(/* struct __sFILE*, struct __suio * */);
} FILE;
#define __SLBF 0x0001 /* line buffered */
#define __SNBF 0x0002 /* unbuffered */
#define __SRD 0x0004 /* OK to read */
#define __SWR 0x0008 /* OK to write */
/* RD and WR are never simultaneously asserted */
#define __SRW 0x0010 /* open for reading & writing */
#define __SEOF 0x0020 /* found EOF */
#define __SERR 0x0040 /* found error */
#define __SMBF 0x0080 /* _buf is from malloc */
#define __SAPP 0x0100 /* fdopen()ed in append mode */
#define __SSTR 0x0200 /* this is an sprintf/snprintf string */
#define __SOPT 0x0400 /* do fseek() optimisation */
#define __SNPT 0x0800 /* do not do fseek() optimisation */
#define __SOFF 0x1000 /* set iff _offset is in fact correct */
#define __SMOD 0x2000 /* true => fgetln modified _p text */
#define EOF (-1)
#define __sfeof(p) (((p)->_flags & __SEOF) != 0)
#define __sferror(p) (((p)->_flags & __SERR) != 0)
#define __sclearerr(p) ((void)((p)->_flags &= ~(__SERR|__SEOF)))
#define __sfileno(p) ((p)->_file)
#undef feof
#undef ferror
#undef clearerr
#define feof(p) __sfeof(p)
#define ferror(p) __sferror(p)
#define clearerr(p) __sclearerr(p)
#ifndef _ANSI_SOURCE
#define fileno(p) __sfileno(p)
#endif
/*
* I/O descriptors for __sfvwrite().
*/
struct __siov {
const void *iov_base;
size_t iov_len;
};
struct __suio {
struct __siov *uio_iov;
int uio_iovcnt;
size_t uio_resid;
};
/*
* Write some memory regions. Return zero on success, EOF on error.
*
* This routine is large and unsightly, but most of the ugliness due
* to the three different kinds of output buffering is handled here.
*/
static int BSD__sfvwrite(fp, uio)
register FILE *fp;
register struct __suio *uio;
{
register size_t len;
register const char *p;
register struct __siov *iov;
register size_t w;
if ((len = uio->uio_resid) == 0)
return (0);
#ifndef __hpux
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
#define COPY(n) (void)memcpy((void *)fp->_p, (void *)p, (size_t)(n))
iov = uio->uio_iov;
p = iov->iov_base;
len = iov->iov_len;
iov++;
#define GETIOV(extra_work) \
while (len == 0) { \
extra_work; \
p = iov->iov_base; \
len = iov->iov_len; \
iov++; \
}
if (fp->_flags & __SNBF) {
/* fjc 7-31-97 Will never happen. We are working with
strings only
*/
} else if ((fp->_flags & __SLBF) == 0) {
/*
* Fully buffered: fill partially full buffer, if any,
* and then flush. If there is no partial buffer, write
* one _bf._size byte chunk directly (without copying).
*
* String output is a special case: write as many bytes
* as fit, but pretend we wrote everything. This makes
* snprintf() return the number of bytes needed, rather
* than the number used, and avoids its write function
* (so that the write function can be invalid).
*/
do {
GETIOV(;);
w = fp->_w;
if (fp->_flags & __SSTR) {
if (len < w)
w = len;
COPY(w); /* copy MIN(fp->_w,len), */
fp->_w -= w;
fp->_p += w;
w = len; /* but pretend copied all */
} else {
/* fjc 7-31-97 Will never happen. We are working with
strings only
*/
}
p += w;
len -= w;
} while ((uio->uio_resid -= w) != 0);
} else {
/* fjc 7-31-97 Will never happen. We are working with
strings only
*/
}
return (0);
}
/*
* Actual printf innards.
*
* This code is large and complicated...
*/
/*
* Flush out all the vectors defined by the given uio,
* then reset it so that it can be reused.
*/
static int
BSD__sprint(FILE *fp, register struct __suio *uio)
{
register int err;
if (uio->uio_resid == 0) {
uio->uio_iovcnt = 0;
return (0);
}
err = (*fp->vwrite)(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
BSD__sbprintf(register FILE *fp, const char *fmt, va_list ap)
{
/* We don't support files. */
return 0;
}
/*
* 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) (char)((n) + '0')
#ifdef _HAVE_SANE_QUAD_
/*
* Convert an unsigned long long to ASCII for printf purposes, returning
* a pointer to the first character of the string representation.
* Octal numbers can be forced to have a leading zero; hex numbers
* use the given digits.
*/
static char *
BSD__uqtoa(register u_quad_t val, char *endp, int base, int octzero, const char *xdigs)
{
register char *cp = endp;
register quad_t sval;
/*
* Handle the three cases separately, in the hope of getting
* better/faster code.
*/
switch (base) {
case 10:
if (val < 10) { /* many numbers are 1 digit */
*--cp = to_char(val);
return (cp);
}
/*
* On many machines, unsigned arithmetic is harder than
* signed arithmetic, so we do at most one unsigned mod and
* divide; this is sufficient to reduce the range of
* the incoming value to where signed arithmetic works.
*/
if (val > LLONG_MAX) {
*--cp = to_char(val % 10);
sval = val / 10;
} else
sval = val;
do {
*--cp = to_char(sval % 10);
sval /= 10;
} while (sval != 0);
break;
case 8:
do {
*--cp = to_char(val & 7);
val >>= 3;
} while (val);
if (octzero && *cp != '0')
*--cp = '0';
break;
case 16:
do {
*--cp = xdigs[val & 15];
val >>= 4;
} while (val);
break;
default: /* oops */
/*
abort();
*/
break; /* fjc 7-31-97. Don't reference abort() here */
}
return (cp);
}
#endif /* _HAVE_SANE_QUAD_ */
/*
* Convert an unsigned long to ASCII for printf purposes, returning
* a pointer to the first character of the string representation.
* Octal numbers can be forced to have a leading zero; hex numbers
* use the given digits.
*/
static char *
BSD__ultoa(register u_long val, char *endp, int base, int octzero, const char *xdigs)
{
register char *cp = endp;
register long sval;
/*
* Handle the three cases separately, in the hope of getting
* better/faster code.
*/
switch (base) {
case 10:
if (val < 10) { /* many numbers are 1 digit */
*--cp = to_char(val);
return (cp);
}
/*
* On many machines, unsigned arithmetic is harder than
* signed arithmetic, so we do at most one unsigned mod and
* divide; this is sufficient to reduce the range of
* the incoming value to where signed arithmetic works.
*/
if (val > LONG_MAX) {
*--cp = to_char(val % 10);
sval = val / 10;
} else
sval = val;
do {
*--cp = to_char(sval % 10);
sval /= 10;
} while (sval != 0);
break;
case 8:
do {
*--cp = to_char(val & 7);
val >>= 3;
} while (val);
if (octzero && *cp != '0')
*--cp = '0';
break;
case 16:
do {
*--cp = xdigs[val & 15];
val >>= 4;
} while (val);
break;
default: /* oops */
/*
abort();
*/
break; /* fjc 7-31-97. Don't reference abort() here */
}
return (cp);
}
#ifdef FLOATING_POINT
#include <math.h>
/* #include "floatio.h" */
#ifndef MAXEXP
# define MAXEXP 1024
#endif
#ifndef MAXFRACT
# define MAXFRACT 64
#endif
#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
#define DEFPREC 6
static char *cvt __P((double, int, int, char *, int *, int, int *, char *));
static int exponent __P((char *, int, int));
#else /* no FLOATING_POINT */
#define BUF 68
#endif /* FLOATING_POINT */
/*
* Flags used during conversion.
*/
#define ALT 0x001 /* alternate form */
#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
#define LADJUST 0x004 /* left adjustment */
#define LONGDBL 0x008 /* long double; unimplemented */
#define LONGINT 0x010 /* long integer */
#ifdef _HAVE_SANE_QUAD_
#define QUADINT 0x020 /* quad integer */
#endif /* _HAVE_SANE_QUAD_ */
#define SHORTINT 0x040 /* short integer */
#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
#define FPT 0x100 /* Floating point number */
static ssize_t
BSD_vfprintf(FILE *fp, const char *fmt0, va_list ap)
{
register const char *fmt; /* format string */
register int ch; /* character from fmt */
register int n; /* handy integer (short term usage) */
register const char *cp;/* handy char pointer (short term usage) */
register struct __siov *iovp;/* for PRINT macro */
register int flags; /* flags as above */
ssize_t 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) */
#ifdef FLOATING_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 = 0; /* actual number of digits returned by cvt */
char expstr[7]; /* buffer for exponent string */
#endif
u_long UNINITIALIZED_VAR(ulval); /* integer arguments %[diouxX] */
#ifdef _HAVE_SANE_QUAD_
u_quad_t UNINITIALIZED_VAR(uqval); /* %q integers */
#endif /* _HAVE_SANE_QUAD_ */
int base; /* base for [diouxX] conversion */
int dprec; /* a copy of prec if [diouxX], 0 otherwise */
long fieldsz; /* field size expanded by sign, etc */
long realsz; /* field size expanded by dprec */
int size; /* size of converted field or string */
const char *xdigs = 0; /* 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[4]; /* space for 0x hex-prefix, hexadecimal's 1. */
char *const ebuf = buf + sizeof(buf);
#if SIZEOF_LONG > SIZEOF_INT
long ln;
#endif
/*
* Choose PADSIZE to trade efficiency vs. size. If larger printf
* fields occur frequently, increase PADSIZE and make the initializers
* 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) { \
iovp->iov_base = (ptr); \
iovp->iov_len = (len); \
uio.uio_resid += (len); \
iovp++; \
if (++uio.uio_iovcnt >= NIOV) { \
if (BSD__sprint(fp, &uio)) \
goto error; \
iovp = iov; \
} \
}
#define PAD(howmany, with) { \
if ((n = (howmany)) > 0) { \
while (n > PADSIZE) { \
PRINT((with), PADSIZE); \
n -= PADSIZE; \
} \
PRINT((with), n); \
} \
}
#if SIZEOF_LONG > SIZEOF_INT
/* abandon if too larger padding */
#define PAD_L(howmany, with) { \
ln = (howmany); \
if ((long)((int)ln) != ln) { \
errno = ENOMEM; \
goto error; \
} \
if (ln > 0) PAD((int)ln, (with)); \
}
#else
#define PAD_L(howmany, with) PAD((howmany), (with))
#endif
#define FLUSH() { \
if (uio.uio_resid && BSD__sprint(fp, &uio)) \
goto error; \
uio.uio_iovcnt = 0; \
iovp = iov; \
}
/*
* To extend shorts properly, we need both signed and unsigned
* argument extraction methods.
*/
#define SARG() \
(flags&LONGINT ? va_arg(ap, long) : \
flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
(long)va_arg(ap, int))
#define UARG() \
(flags&LONGINT ? va_arg(ap, u_long) : \
flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
(u_long)va_arg(ap, u_int))
/* optimise fprintf(stderr) (and other unbuffered Unix files) */
if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
fp->_file >= 0)
return (BSD__sbprintf(fp, fmt0, ap));
fmt = fmt0;
uio.uio_iov = iovp = iov;
uio.uio_resid = 0;
uio.uio_iovcnt = 0;
ret = 0;
xdigs = 0;
/*
* Scan the format for conversions (`%' character).
*/
for (;;) {
size_t nc;
for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
/* void */;
if ((nc = fmt - cp) != 0) {
PRINT(cp, nc);
ret += nc;
}
if (ch == '\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.
*/
if ((width = va_arg(ap, int)) >= 0)
goto rflag;
width = -width;
/* FALLTHROUGH */
case '-':
flags |= LADJUST;
goto rflag;
case '+':
sign = '+';
goto rflag;
case '.':
if ((ch = *fmt++) == '*') {
n = va_arg(ap, int);
prec = n < 0 ? -1 : n;
goto rflag;
}
n = 0;
while (is_digit(ch)) {
n = 10 * n + to_digit(ch);
ch = *fmt++;
}
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));
width = n;
goto reswitch;
#ifdef FLOATING_POINT
case 'L':
flags |= LONGDBL;
goto rflag;
#endif
case 'h':
flags |= SHORTINT;
goto rflag;
#if SIZEOF_PTRDIFF_T == SIZEOF_LONG
case 't':
#endif
#if SIZEOF_SIZE_T == SIZEOF_LONG
case 'z':
#endif
case 'l':
flags |= LONGINT;
goto rflag;
#ifdef _HAVE_SANE_QUAD_
#if SIZEOF_PTRDIFF_T == SIZEOF_LONG_LONG
case 't':
#endif
#if SIZEOF_SIZE_T == SIZEOF_LONG_LONG
case 'z':
#endif
case 'q':
flags |= QUADINT;
goto rflag;
#endif /* _HAVE_SANE_QUAD_ */
#ifdef _WIN32
case 'I':
if (*fmt == '3' && *(fmt + 1) == '2') {
fmt += 2;
flags |= LONGINT;
}
#ifdef _HAVE_SANE_QUAD_
else if (*fmt == '6' && *(fmt + 1) == '4') {
fmt += 2;
flags |= QUADINT;
}
#endif
else
#if defined(_HAVE_SANE_QUAD_) && SIZEOF_SIZE_T == SIZEOF_LONG_LONG
flags |= QUADINT;
#else
flags |= LONGINT;
#endif
goto rflag;
#endif
case 'c':
cp = buf;
*buf = (char)va_arg(ap, int);
size = 1;
sign = '\0';
break;
case 'D':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'd':
case 'i':
#ifdef _HAVE_SANE_QUAD_
if (flags & QUADINT) {
uqval = va_arg(ap, quad_t);
if ((quad_t)uqval < 0) {
uqval = -(quad_t)uqval;
sign = '-';
}
} else
#endif /* _HAVE_SANE_QUAD_ */
{
ulval = SARG();
if ((long)ulval < 0) {
ulval = (u_long)(-(long)ulval);
sign = '-';
}
}
base = 10;
goto number;
#ifdef FLOATING_POINT
case 'a':
case 'A':
if (prec > 0) {
flags |= ALT;
prec++;
}
goto fp_begin;
case 'e': /* anomalous precision */
case 'E':
if (prec != 0)
flags |= ALT;
prec = (prec == -1) ?
DEFPREC + 1 : prec + 1;
/* FALLTHROUGH */
goto fp_begin;
case 'f': /* always print trailing zeroes */
if (prec != 0)
flags |= ALT;
case 'g':
case 'G':
if (prec == -1)
prec = DEFPREC;
fp_begin: _double = va_arg(ap, double);
/* do this before tricky precision changes */
if (isinf(_double)) {
if (_double < 0)
sign = '-';
cp = "Inf";
size = 3;
break;
}
if (isnan(_double)) {
cp = "NaN";
size = 3;
break;
}
flags |= FPT;
cp = cvt(_double, prec, flags, &softsign,
&expt, ch, &ndig, buf);
if (ch == 'g' || ch == 'G') {
if (expt <= -4 || (expt > prec && expt > 1))
ch = (ch == 'g') ? 'e' : 'E';
else
ch = 'g';
}
if (ch == 'a' || ch == 'A') {
flags |= HEXPREFIX;
--expt;
expsize = exponent(expstr, expt, ch + 'p' - 'a');
ch += 'x' - 'a';
size = expsize + ndig;
if (ndig > 1 || flags & ALT)
++size; /* floating point */
}
else 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 if (!prec) { /* "0" */
size = 1;
if (flags & ALT)
size += 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 */
case 'n':
#ifdef _HAVE_SANE_QUAD_
if (flags & QUADINT)
*va_arg(ap, quad_t *) = ret;
else if (flags & LONGINT)
#else /* _HAVE_SANE_QUAD_ */
if (flags & LONGINT)
#endif /* _HAVE_SANE_QUAD_ */
*va_arg(ap, long *) = ret;
else if (flags & SHORTINT)
*va_arg(ap, short *) = (short)ret;
else
*va_arg(ap, int *) = (int)ret;
continue; /* no output */
case 'O':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'o':
#ifdef _HAVE_SANE_QUAD_
if (flags & QUADINT)
uqval = va_arg(ap, u_quad_t);
else
#endif /* _HAVE_SANE_QUAD_ */
ulval = UARG();
base = 8;
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
*/
prec = (int)(sizeof(void*)*CHAR_BIT/4);
#ifdef _HAVE_LLP64_
uqval = (u_quad_t)va_arg(ap, void *);
flags = (flags) | QUADINT | HEXPREFIX;
#else
ulval = (u_long)va_arg(ap, void *);
#ifdef _HAVE_SANE_QUAD_
flags = (flags & ~QUADINT) | HEXPREFIX;
#else /* _HAVE_SANE_QUAD_ */
flags = (flags) | HEXPREFIX;
#endif /* _HAVE_SANE_QUAD_ */
#endif
base = 16;
xdigs = "0123456789abcdef";
ch = 'x';
goto nosign;
case 's':
if ((cp = va_arg(ap, 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.
*/
const char *p = (char *)memchr(cp, 0, prec);
if (p != NULL && (p - cp) > prec)
size = (int)(p - cp);
else
size = prec;
}
else {
fieldsz = strlen(cp);
goto long_len;
}
sign = '\0';
break;
case 'U':
flags |= LONGINT;
/*FALLTHROUGH*/
case 'u':
#ifdef _HAVE_SANE_QUAD_
if (flags & QUADINT)
uqval = va_arg(ap, u_quad_t);
else
#endif /* _HAVE_SANE_QUAD_ */
ulval = UARG();
base = 10;
goto nosign;
case 'X':
xdigs = "0123456789ABCDEF";
goto hex;
case 'x':
xdigs = "0123456789abcdef";
hex:
#ifdef _HAVE_SANE_QUAD_
if (flags & QUADINT)
uqval = va_arg(ap, u_quad_t);
else
#endif /* _HAVE_SANE_QUAD_ */
ulval = UARG();
base = 16;
/* leading 0x/X only if non-zero */
if (flags & ALT &&
#ifdef _HAVE_SANE_QUAD_
(flags & QUADINT ? uqval != 0 : ulval != 0)
#else /* _HAVE_SANE_QUAD_ */
ulval != 0
#endif /* _HAVE_SANE_QUAD_ */
)
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
*/
#ifdef _HAVE_SANE_QUAD_
if (flags & QUADINT) {
if (uqval != 0 || prec != 0)
cp = BSD__uqtoa(uqval, ebuf, base,
flags & ALT, xdigs);
} else
#else /* _HAVE_SANE_QUAD_ */
#endif /* _HAVE_SANE_QUAD_ */
{
if (ulval != 0 || prec != 0)
cp = BSD__ultoa(ulval, ebuf, base,
flags & ALT, xdigs);
}
size = (int)(ebuf - cp);
break;
default: /* "%?" prints ?, unless ? is NUL */
if (ch == '\0')
goto done;
/* pretend it was %c with argument ch */
cp = buf;
*buf = 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.
* fieldsz excludes decimal prec; realsz includes it.
*/
fieldsz = size;
long_len:
if (sign)
fieldsz++;
if (flags & HEXPREFIX)
fieldsz += 2;
realsz = dprec > fieldsz ? dprec : fieldsz;
/* right-adjusting blank padding */
if ((flags & (LADJUST|ZEROPAD)) == 0)
PAD_L(width - realsz, blanks);
/* prefix */
if (sign) {
PRINT(&sign, 1);
}
if (flags & HEXPREFIX) {
ox[0] = '0';
ox[1] = ch;
PRINT(ox, 2);
}
/* right-adjusting zero padding */
if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD)
PAD_L(width - realsz, zeroes);
/* leading zeroes from decimal precision */
PAD_L(dprec - fieldsz, zeroes);
if (sign)
fieldsz--;
if (flags & HEXPREFIX)
fieldsz -= 2;
/* the string or number proper */
#ifdef FLOATING_POINT
if ((flags & FPT) == 0) {
PRINT(cp, fieldsz);
} else { /* glue together f_p fragments */
if (flags & HEXPREFIX) {
if (ndig > 1 || flags & ALT) {
ox[2] = *cp++;
ox[3] = '.';
PRINT(ox+2, 2);
if (ndig > 0) PRINT(cp, ndig-1);
} else /* XpYYY */
PRINT(cp, 1);
PRINT(expstr, expsize);
}
else if (ch >= 'f') { /* 'f' or 'g' */
if (_double == 0) {
/* kludge for __dtoa irregularity */
if (ndig <= 1 &&
(flags & ALT) == 0) {
PRINT("0", 1);
} else {
PRINT("0.", 2);
PAD(ndig - 1, zeroes);
}
} else if (expt == 0 && ndig == 0 && (flags & ALT) == 0) {
PRINT("0", 1);
} else if (expt <= 0) {
PRINT("0.", 2);
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 /*|| flags & ALT == 0*/) {
PRINT(cp, ndig-1);
} else /* 0.[0..] */
/* __dtoa irregularity */
PAD(ndig - 1, zeroes);
} else /* XeYYY */
PRINT(cp, 1);
PRINT(expstr, expsize);
}
}
#else
PRINT(cp, fieldsz);
#endif
/* left-adjusting padding (always blank) */
if (flags & LADJUST)
PAD_L(width - realsz, blanks);
/* finally, adjust ret */
ret += width > realsz ? width : realsz;
FLUSH(); /* copy out the I/O vectors */
}
done:
FLUSH();
error:
return (__sferror(fp) ? EOF : ret);
/* NOTREACHED */
}
#ifdef FLOATING_POINT
extern char *BSD__dtoa __P((double, int, int, int *, int *, char **));
extern char *BSD__hdtoa(double, const char *, int, int *, int *, char **);
static char *
cvt(value, ndigits, flags, sign, decpt, ch, length, buf)
double value;
int ndigits, flags, *decpt, ch, *length;
char *sign, *buf;
{
int mode, dsgn;
char *digits, *bp, *rve;
if (ch == 'f')
mode = 3;
else {
mode = 2;
}
if (value < 0) {
value = -value;
*sign = '-';
} else if (value == 0.0 && 1.0/value < 0) {
*sign = '-';
} else {
*sign = '\000';
}
if (ch == 'a' || ch =='A') {
digits = BSD__hdtoa(value,
ch == 'a' ? "0123456789abcdef" : "0123456789ABCDEF",
ndigits, decpt, &dsgn, &rve);
}
else {
digits = BSD__dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
}
buf[0] = 0; /* rve - digits may be 0 */
memcpy(buf, digits, rve - digits);
xfree(digits);
rve = buf + (rve - digits);
digits = buf;
if (flags & ALT) { /* Print trailing zeros */
bp = digits + ndigits;
if (ch == 'f') {
if (*digits == '0' && value)
*decpt = -ndigits + 1;
bp += *decpt;
}
while (rve < bp)
*rve++ = '0';
}
*length = (int)(rve - digits);
return (digits);
}
static int
exponent(p0, exp, fmtch)
char *p0;
int exp, fmtch;
{
register 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 {
if (fmtch & 15) *p++ = '0'; /* other than p or P */
*p++ = to_char(exp);
}
return (int)(p - p0);
}
#endif /* FLOATING_POINT */
int
ruby_vsnprintf(char *str, size_t n, const char *fmt, va_list ap)
{
int ret;
FILE f;
if ((int)n < 1)
return (EOF);
f._flags = __SWR | __SSTR;
f._bf._base = f._p = (unsigned char *)str;
f._bf._size = f._w = n - 1;
f.vwrite = BSD__sfvwrite;
ret = (int)BSD_vfprintf(&f, fmt, ap);
*f._p = 0;
return (ret);
}
int
ruby_snprintf(char *str, size_t n, char const *fmt, ...)
{
int ret;
va_list ap;
FILE f;
if ((int)n < 1)
return (EOF);
va_start(ap, fmt);
f._flags = __SWR | __SSTR;
f._bf._base = f._p = (unsigned char *)str;
f._bf._size = f._w = n - 1;
f.vwrite = BSD__sfvwrite;
ret = (int)BSD_vfprintf(&f, fmt, ap);
*f._p = 0;
va_end(ap);
return (ret);
}