762 lines
18 KiB
C
762 lines
18 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)vfprintf.c 5.50 (Berkeley) 12/16/92";
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#endif /* LIBC_SCCS and not lint */
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/*
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* Actual printf innards.
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*
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* This code is large and complicated...
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#if __STDC__
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#include <stdarg.h>
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#else
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#include <varargs.h>
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#endif
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#include "local.h"
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#include "fvwrite.h"
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/* Define FLOATING_POINT to get floating point. */
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#define FLOATING_POINT
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/*
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* Flush out all the vectors defined by the given uio,
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* then reset it so that it can be reused.
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*/
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static int
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__sprint(fp, uio)
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FILE *fp;
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register struct __suio *uio;
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{
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register int err;
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if (uio->uio_resid == 0) {
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uio->uio_iovcnt = 0;
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return (0);
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}
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err = __sfvwrite(fp, uio);
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uio->uio_resid = 0;
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uio->uio_iovcnt = 0;
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return (err);
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}
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/*
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* Helper function for `fprintf to unbuffered unix file': creates a
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* temporary buffer. We only work on write-only files; this avoids
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* worries about ungetc buffers and so forth.
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*/
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static int
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__sbprintf(fp, fmt, ap)
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register FILE *fp;
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const char *fmt;
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va_list ap;
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{
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int ret;
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FILE fake;
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unsigned char buf[BUFSIZ];
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/* copy the important variables */
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fake._flags = fp->_flags & ~__SNBF;
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fake._file = fp->_file;
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fake._cookie = fp->_cookie;
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fake._write = fp->_write;
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/* set up the buffer */
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fake._bf._base = fake._p = buf;
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fake._bf._size = fake._w = sizeof(buf);
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fake._lbfsize = 0; /* not actually used, but Just In Case */
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/* do the work, then copy any error status */
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ret = vfprintf(&fake, fmt, ap);
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if (ret >= 0 && fflush(&fake))
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ret = EOF;
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if (fake._flags & __SERR)
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fp->_flags |= __SERR;
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return (ret);
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}
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#ifdef FLOATING_POINT
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#include <math.h>
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#include "floatio.h"
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#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */
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#define DEFPREC 6
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static char *cvt __P((double, int, int, char *, int *, int, int *));
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static int exponent __P((char *, int, int));
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#else /* no FLOATING_POINT */
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#define BUF 40
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#endif /* FLOATING_POINT */
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/*
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* Macros for converting digits to letters and vice versa
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*/
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#define to_digit(c) ((c) - '0')
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#define is_digit(c) ((unsigned)to_digit(c) <= 9)
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#define to_char(n) ((n) + '0')
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/*
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* Flags used during conversion.
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*/
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#define ALT 0x001 /* alternate form */
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#define HEXPREFIX 0x002 /* add 0x or 0X prefix */
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#define LADJUST 0x004 /* left adjustment */
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#define LONGDBL 0x008 /* long double; unimplemented */
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#define LONGINT 0x010 /* long integer */
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#define QUADINT 0x020 /* quad integer */
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#define SHORTINT 0x040 /* short integer */
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#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */
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#define FPT 0x100 /* Floating point number */
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int
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vfprintf(fp, fmt0, ap)
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FILE *fp;
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const char *fmt0;
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_VA_LIST_ ap;
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{
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register char *fmt; /* format string */
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register int ch; /* character from fmt */
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register int n; /* handy integer (short term usage) */
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register char *cp; /* handy char pointer (short term usage) */
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register struct __siov *iovp;/* for PRINT macro */
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register int flags; /* flags as above */
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int ret; /* return value accumulator */
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int width; /* width from format (%8d), or 0 */
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int prec; /* precision from format (%.3d), or -1 */
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char sign; /* sign prefix (' ', '+', '-', or \0) */
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#ifdef FLOATING_POINT
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char softsign; /* temporary negative sign for floats */
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double _double; /* double precision arguments %[eEfgG] */
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int expt; /* integer value of exponent */
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int expsize; /* character count for expstr */
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int ndig; /* actual number of digits returned by cvt */
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char expstr[7]; /* buffer for exponent string */
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#endif
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#ifdef __GNUC__ /* gcc has builtin quad type (long long) SOS */
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#define quad_t long long
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#define u_quad_t unsigned long long
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#endif
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u_quad_t _uquad; /* integer arguments %[diouxX] */
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enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */
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int dprec; /* a copy of prec if [diouxX], 0 otherwise */
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int fieldsz; /* field size expanded by sign, etc */
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int realsz; /* field size expanded by dprec */
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int size; /* size of converted field or string */
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char *xdigs; /* digits for [xX] conversion */
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#define NIOV 8
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struct __suio uio; /* output information: summary */
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struct __siov iov[NIOV];/* ... and individual io vectors */
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char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
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char ox[2]; /* space for 0x hex-prefix */
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/*
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* Choose PADSIZE to trade efficiency vs. size. If larger printf
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* fields occur frequently, increase PADSIZE and make the initialisers
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* below longer.
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*/
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#define PADSIZE 16 /* pad chunk size */
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static char blanks[PADSIZE] =
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{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
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static char zeroes[PADSIZE] =
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{'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'};
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/*
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* BEWARE, these `goto error' on error, and PAD uses `n'.
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*/
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#define PRINT(ptr, len) { \
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iovp->iov_base = (ptr); \
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iovp->iov_len = (len); \
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uio.uio_resid += (len); \
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iovp++; \
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if (++uio.uio_iovcnt >= NIOV) { \
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if (__sprint(fp, &uio)) \
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goto error; \
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iovp = iov; \
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} \
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}
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#define PAD(howmany, with) { \
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if ((n = (howmany)) > 0) { \
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while (n > PADSIZE) { \
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PRINT(with, PADSIZE); \
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n -= PADSIZE; \
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} \
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PRINT(with, n); \
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} \
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}
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#define FLUSH() { \
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if (uio.uio_resid && __sprint(fp, &uio)) \
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goto error; \
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uio.uio_iovcnt = 0; \
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iovp = iov; \
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}
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/*
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* To extend shorts properly, we need both signed and unsigned
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* argument extraction methods.
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*/
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#define SARG() \
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(flags&QUADINT ? va_arg(ap, quad_t) : \
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flags&LONGINT ? va_arg(ap, long) : \
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flags&SHORTINT ? (long)(short)va_arg(ap, int) : \
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(long)va_arg(ap, int))
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#define UARG() \
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(flags&QUADINT ? va_arg(ap, u_quad_t) : \
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flags&LONGINT ? va_arg(ap, u_long) : \
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flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \
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(u_long)va_arg(ap, u_int))
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/* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
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if (cantwrite(fp))
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return (EOF);
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/* optimise fprintf(stderr) (and other unbuffered Unix files) */
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if ((fp->_flags & (__SNBF|__SWR|__SRW)) == (__SNBF|__SWR) &&
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fp->_file >= 0)
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return (__sbprintf(fp, fmt0, ap));
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fmt = (char *)fmt0;
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uio.uio_iov = iovp = iov;
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uio.uio_resid = 0;
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uio.uio_iovcnt = 0;
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ret = 0;
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/*
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* Scan the format for conversions (`%' character).
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*/
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for (;;) {
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for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
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/* void */;
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if ((n = fmt - cp) != 0) {
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PRINT(cp, n);
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ret += n;
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}
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if (ch == '\0')
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goto done;
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fmt++; /* skip over '%' */
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flags = 0;
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dprec = 0;
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width = 0;
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prec = -1;
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sign = '\0';
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rflag: ch = *fmt++;
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reswitch: switch (ch) {
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case ' ':
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/*
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* ``If the space and + flags both appear, the space
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* flag will be ignored.''
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* -- ANSI X3J11
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*/
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if (!sign)
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sign = ' ';
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goto rflag;
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case '#':
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flags |= ALT;
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goto rflag;
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case '*':
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/*
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* ``A negative field width argument is taken as a
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* - flag followed by a positive field width.''
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* -- ANSI X3J11
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* They don't exclude field widths read from args.
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*/
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if ((width = va_arg(ap, int)) >= 0)
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goto rflag;
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width = -width;
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/* FALLTHROUGH */
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case '-':
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flags |= LADJUST;
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goto rflag;
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case '+':
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sign = '+';
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goto rflag;
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case '.':
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if ((ch = *fmt++) == '*') {
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n = va_arg(ap, int);
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prec = n < 0 ? -1 : n;
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goto rflag;
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}
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n = 0;
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while (is_digit(ch)) {
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n = 10 * n + to_digit(ch);
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ch = *fmt++;
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}
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prec = n < 0 ? -1 : n;
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goto reswitch;
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case '0':
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/*
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* ``Note that 0 is taken as a flag, not as the
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* beginning of a field width.''
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* -- ANSI X3J11
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*/
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flags |= ZEROPAD;
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goto rflag;
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case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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n = 0;
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do {
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n = 10 * n + to_digit(ch);
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ch = *fmt++;
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} while (is_digit(ch));
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width = n;
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goto reswitch;
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#ifdef FLOATING_POINT
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case 'L':
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flags |= LONGDBL;
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goto rflag;
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#endif
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case 'h':
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flags |= SHORTINT;
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goto rflag;
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case 'l':
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flags |= LONGINT;
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goto rflag;
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case 'q':
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flags |= QUADINT;
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goto rflag;
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case 'c':
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*(cp = buf) = va_arg(ap, int);
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size = 1;
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sign = '\0';
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break;
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case 'D':
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flags |= LONGINT;
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/*FALLTHROUGH*/
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case 'd':
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case 'i':
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_uquad = SARG();
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if ((quad_t)_uquad < 0) {
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_uquad = -_uquad;
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sign = '-';
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}
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base = DEC;
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goto number;
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#ifdef FLOATING_POINT
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case 'e': /* anomalous precision */
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case 'E':
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prec = (prec == -1) ?
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DEFPREC + 1 : prec + 1;
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/* FALLTHROUGH */
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goto fp_begin;
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case 'f': /* always print trailing zeroes */
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if (prec != 0)
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flags |= ALT;
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case 'g':
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case 'G':
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if (prec == -1)
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prec = DEFPREC;
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fp_begin: _double = va_arg(ap, double);
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/* do this before tricky precision changes */
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if (isinf(_double)) {
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if (_double < 0)
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sign = '-';
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cp = "Inf";
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size = 3;
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break;
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}
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if (isnan(_double)) {
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cp = "NaN";
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size = 3;
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break;
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}
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flags |= FPT;
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cp = cvt(_double, prec, flags, &softsign,
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&expt, ch, &ndig);
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if (ch == 'g' || ch == 'G') {
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if (expt <= -4 || expt > prec)
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ch = (ch == 'g') ? 'e' : 'E';
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else
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ch = 'g';
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}
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if (ch <= 'e') { /* 'e' or 'E' fmt */
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--expt;
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expsize = exponent(expstr, expt, ch);
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size = expsize + ndig;
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if (ndig > 1 || flags & ALT)
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++size;
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} else if (ch == 'f') { /* f fmt */
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if (expt > 0) {
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size = expt;
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if (prec || flags & ALT)
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size += prec + 1;
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} else /* "0.X" */
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size = prec + 2;
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} else if (expt >= ndig) { /* fixed g fmt */
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size = expt;
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if (flags & ALT)
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++size;
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} else
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size = ndig + (expt > 0 ?
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1 : 2 - expt);
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if (softsign)
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sign = '-';
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break;
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#endif /* FLOATING_POINT */
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case 'n':
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if (flags & QUADINT)
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*va_arg(ap, quad_t *) = ret;
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else if (flags & LONGINT)
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*va_arg(ap, long *) = ret;
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else if (flags & SHORTINT)
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*va_arg(ap, short *) = ret;
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else
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*va_arg(ap, int *) = ret;
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continue; /* no output */
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case 'O':
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flags |= LONGINT;
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/*FALLTHROUGH*/
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case 'o':
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_uquad = UARG();
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base = OCT;
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goto nosign;
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case 'p':
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/*
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* ``The argument shall be a pointer to void. The
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* value of the pointer is converted to a sequence
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* of printable characters, in an implementation-
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* defined manner.''
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* -- ANSI X3J11
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*/
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/* NOSTRICT */
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_uquad = (u_quad_t)va_arg(ap, void *);
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base = HEX;
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xdigs = "0123456789abcdef";
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flags |= HEXPREFIX;
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ch = 'x';
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goto nosign;
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case 's':
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if ((cp = va_arg(ap, char *)) == NULL)
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cp = "(null)";
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if (prec >= 0) {
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/*
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* can't use strlen; can only look for the
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* NUL in the first `prec' characters, and
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* strlen() will go further.
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*/
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char *p = memchr(cp, 0, prec);
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if (p != NULL) {
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size = p - cp;
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if (size > prec)
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size = prec;
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} else
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size = prec;
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} else
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size = strlen(cp);
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sign = '\0';
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break;
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case 'U':
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flags |= LONGINT;
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/*FALLTHROUGH*/
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case 'u':
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_uquad = UARG();
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base = DEC;
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goto nosign;
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case 'X':
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xdigs = "0123456789ABCDEF";
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goto hex;
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case 'x':
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xdigs = "0123456789abcdef";
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hex: _uquad = UARG();
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base = HEX;
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/* leading 0x/X only if non-zero */
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if (flags & ALT && _uquad != 0)
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flags |= HEXPREFIX;
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/* unsigned conversions */
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nosign: sign = '\0';
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/*
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* ``... diouXx conversions ... if a precision is
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* specified, the 0 flag will be ignored.''
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* -- ANSI X3J11
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*/
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number: if ((dprec = prec) >= 0)
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flags &= ~ZEROPAD;
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/*
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* ``The result of converting a zero value with an
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* explicit precision of zero is no characters.''
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* -- ANSI X3J11
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*/
|
|
cp = buf + BUF;
|
|
if (_uquad != 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(_uquad & 7);
|
|
_uquad >>= 3;
|
|
} while (_uquad);
|
|
/* handle octal leading 0 */
|
|
if (flags & ALT && *cp != '0')
|
|
*--cp = '0';
|
|
break;
|
|
|
|
case DEC:
|
|
/* many numbers are 1 digit */
|
|
while (_uquad >= 10) {
|
|
*--cp = to_char(_uquad % 10);
|
|
_uquad /= 10;
|
|
}
|
|
*--cp = to_char(_uquad);
|
|
break;
|
|
|
|
case HEX:
|
|
do {
|
|
*--cp = xdigs[_uquad & 15];
|
|
_uquad >>= 4;
|
|
} while (_uquad);
|
|
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.
|
|
* fieldsz excludes decimal prec; realsz includes it.
|
|
*/
|
|
fieldsz = size;
|
|
if (sign)
|
|
fieldsz++;
|
|
else if (flags & HEXPREFIX)
|
|
fieldsz += 2;
|
|
realsz = dprec > fieldsz ? dprec : fieldsz;
|
|
|
|
/* 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 - fieldsz, 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 */
|
|
if (prec == 0 ||
|
|
(flags & ALT) == 0) {
|
|
PRINT("0", 1);
|
|
} else {
|
|
PRINT("0.", 2);
|
|
PAD(ndig - 1, zeroes);
|
|
}
|
|
} 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, 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 */
|
|
}
|
|
done:
|
|
FLUSH();
|
|
error:
|
|
return (__sferror(fp) ? EOF : ret);
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#ifdef FLOATING_POINT
|
|
|
|
extern char *__dtoa __P((double, int, int, int *, int *, char **));
|
|
|
|
static char *
|
|
cvt(value, ndigits, flags, sign, decpt, ch, length)
|
|
double value;
|
|
int ndigits, flags, *decpt, ch, *length;
|
|
char *sign;
|
|
{
|
|
int mode, dsgn;
|
|
char *digits, *bp, *rve;
|
|
|
|
if (ch == 'f')
|
|
mode = 3;
|
|
else {
|
|
mode = 2;
|
|
}
|
|
if (value < 0) {
|
|
value = -value;
|
|
*sign = '-';
|
|
} else
|
|
*sign = '\000';
|
|
digits = __dtoa(value, mode, ndigits, decpt, &dsgn, &rve);
|
|
if (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(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 {
|
|
*p++ = '0';
|
|
*p++ = to_char(exp);
|
|
}
|
|
return (p - p0);
|
|
}
|
|
#endif /* FLOATING_POINT */
|