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916 lines
21 KiB
C
916 lines
21 KiB
C
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#line 1 ":src:gno:lib:libc:stdio:vfprintf.c"
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. 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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#ifdef __ORCAC__
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segment "libc_stdio";
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#pragma debug -1
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#pragma optimize 72
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#endif
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#ifdef __GNO__
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#define STATIC static
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#else
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#define STATIC
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#endif
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)vfprintf.c 8.1 (Berkeley) 6/4/93";
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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 <limits.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(FILE *fp, 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(register FILE *fp, const char *fmt, va_list ap)
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{
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int ret;
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FILE fake;
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/* ifdef __GNO__ */
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#if 0
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char *buf;
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if (buf = malloc(BUFSIZ)) {
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/* not much we can do here */
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return 0;
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}
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#else
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unsigned char buf[BUFSIZ];
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#endif
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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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/* ifdef __GNO__ */
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#if 0
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free(buf);
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#endif
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return (ret);
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}
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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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* Convert an unsigned long to ASCII for printf purposes, returning
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* a pointer to the first character of the string representation.
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* Octal numbers can be forced to have a leading zero; hex numbers
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* use the given digits.
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*/
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static char *
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__ultoa(register u_long val, char *endp, int base, int octzero, char *xdigs)
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{
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register char *cp = endp;
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register long sval;
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/*
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* Handle the three cases separately, in the hope of getting
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* better/faster code.
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*/
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switch (base) {
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case 10:
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if (val < 10) { /* many numbers are 1 digit */
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*--cp = to_char(val);
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return (cp);
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}
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/*
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* On many machines, unsigned arithmetic is harder than
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* signed arithmetic, so we do at most one unsigned mod and
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* divide; this is sufficient to reduce the range of
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* the incoming value to where signed arithmetic works.
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*/
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if (val > LONG_MAX) {
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*--cp = to_char(val % 10);
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sval = val / 10;
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} else
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sval = val;
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do {
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*--cp = to_char(sval % 10);
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sval /= 10;
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} while (sval != 0);
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break;
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case 8:
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do {
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*--cp = to_char(val & 7);
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val >>= 3;
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} while (val);
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if (octzero && *cp != '0')
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*--cp = '0';
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break;
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case 16:
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do {
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*--cp = xdigs[val & 15];
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val >>= 4;
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} while (val);
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break;
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default: /* oops */
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abort();
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}
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return (cp);
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}
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#ifdef HAS_QUAD_T
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/* Identical to __ultoa, but for quads. */
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static char *
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__uqtoa(register u_quad_t val, char *endp, int base, int octzero, char *xdigs)
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{
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register char *cp = endp;
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register quad_t sval;
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/* quick test for small values; __ultoa is typically much faster */
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/* (perhaps instead we should run until small, then call __ultoa?) */
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if (val <= ULONG_MAX)
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return (__ultoa((u_long)val, endp, base, octzero, xdigs));
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switch (base) {
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case 10:
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if (val < 10) {
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*--cp = to_char(val % 10);
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return (cp);
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}
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if (val > QUAD_MAX) {
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*--cp = to_char(val % 10);
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sval = val / 10;
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} else
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sval = val;
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do {
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*--cp = to_char(sval % 10);
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sval /= 10;
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} while (sval != 0);
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break;
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case 8:
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do {
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*--cp = to_char(val & 7);
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val >>= 3;
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} while (val);
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if (octzero && *cp != '0')
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*--cp = '0';
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break;
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case 16:
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do {
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*--cp = xdigs[val & 15];
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val >>= 4;
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} while (val);
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break;
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default:
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abort();
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}
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return (cp);
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}
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#endif /* HAS_QUAD_T */
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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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#ifdef __ORCAC__
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typedef extended double_spec_t;
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typedef extended ldouble_spec_t;
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#else
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typedef double double_spec_t;
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typedef long double ldouble_spec_t;
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#endif
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static char *cvt __P((double_spec_t, 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 68
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#endif /* FLOATING_POINT */
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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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|
#ifdef HAS_QUAD_T
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#define QUADINT 0x020 /* quad integer */
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#endif
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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(FILE *fp, const char *fmt0, 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 */
|
||
|
double_spec_t _double; /* double precision arguments %[eEfgG] */
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||
|
int expt; /* integer value of exponent */
|
||
|
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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||
|
u_long ulval; /* integer arguments %[diouxX] */
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||
|
#ifdef HAS_QUAD_T
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||
|
u_quad_t uqval; /* %q integers */
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||
|
#endif
|
||
|
int 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 */
|
||
|
int size; /* size of converted field or string */
|
||
|
char *xdigs; /* digits for [xX] conversion */
|
||
|
#define NIOV 8
|
||
|
struct __suio uio; /* output information: summary */
|
||
|
struct __siov iov[NIOV];/* ... and individual io vectors */
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||
|
char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */
|
||
|
char ox[2]; /* space for 0x hex-prefix */
|
||
|
|
||
|
/*
|
||
|
* 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 char blanks[PADSIZE] =
|
||
|
{' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '};
|
||
|
static 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 (__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); \
|
||
|
} \
|
||
|
}
|
||
|
#define FLUSH() { \
|
||
|
if (uio.uio_resid && __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))
|
||
|
|
||
|
/* sorry, fprintf(read_only_file, "") returns EOF, not 0 */
|
||
|
if (cantwrite(fp))
|
||
|
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;
|
||
|
uio.uio_iov = iovp = iov;
|
||
|
uio.uio_resid = 0;
|
||
|
uio.uio_iovcnt = 0;
|
||
|
ret = 0;
|
||
|
|
||
|
/*
|
||
|
* Scan the format for conversions (`%' character).
|
||
|
*/
|
||
|
for (;;) {
|
||
|
for (cp = fmt; (ch = *fmt) != '\0' && ch != '%'; fmt++)
|
||
|
/* void */;
|
||
|
if ((n = fmt - cp) != 0) {
|
||
|
PRINT(cp, n);
|
||
|
ret += n;
|
||
|
}
|
||
|
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;
|
||
|
case 'l':
|
||
|
flags |= LONGINT;
|
||
|
goto rflag;
|
||
|
#ifdef HAS_QUAD_T
|
||
|
case 'q':
|
||
|
flags |= QUADINT;
|
||
|
goto rflag;
|
||
|
#endif
|
||
|
case 'c':
|
||
|
*(cp = buf) = va_arg(ap, int);
|
||
|
size = 1;
|
||
|
sign = '\0';
|
||
|
break;
|
||
|
case 'D':
|
||
|
flags |= LONGINT;
|
||
|
/*FALLTHROUGH*/
|
||
|
case 'd':
|
||
|
case 'i':
|
||
|
#ifdef HAS_QUAD_T
|
||
|
if (flags & QUADINT) {
|
||
|
uqval = va_arg(ap, quad_t);
|
||
|
if ((quad_t)uqval < 0) {
|
||
|
uqval = -uqval;
|
||
|
sign = '-';
|
||
|
}
|
||
|
} else
|
||
|
#endif
|
||
|
{
|
||
|
ulval = SARG();
|
||
|
if ((long)ulval < 0) {
|
||
|
ulval = -ulval;
|
||
|
sign = '-';
|
||
|
}
|
||
|
}
|
||
|
base = 10;
|
||
|
goto number;
|
||
|
#ifdef FLOATING_POINT
|
||
|
case 'e':
|
||
|
case 'E':
|
||
|
case 'f':
|
||
|
goto fp_begin;
|
||
|
case 'g':
|
||
|
case 'G':
|
||
|
if (prec == 0)
|
||
|
prec = 1;
|
||
|
fp_begin: if (prec == -1)
|
||
|
prec = DEFPREC;
|
||
|
#ifndef __ORCAC__
|
||
|
if (flags & LONGDBL)
|
||
|
_double = (double_spec_t)va_arg(ap, ldouble_spec_t);
|
||
|
else
|
||
|
#endif
|
||
|
_double = va_arg(ap, double_spec_t);
|
||
|
/* 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);
|
||
|
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 */
|
||
|
case 'n':
|
||
|
#ifdef HAS_QUAD_T
|
||
|
if (flags & QUADINT)
|
||
|
*va_arg(ap, quad_t *) = ret;
|
||
|
else
|
||
|
#endif
|
||
|
if (flags & LONGINT)
|
||
|
*va_arg(ap, long *) = ret;
|
||
|
else if (flags & SHORTINT)
|
||
|
*va_arg(ap, short *) = ret;
|
||
|
else
|
||
|
*va_arg(ap, int *) = ret;
|
||
|
continue; /* no output */
|
||
|
case 'O':
|
||
|
flags |= LONGINT;
|
||
|
/*FALLTHROUGH*/
|
||
|
case 'o':
|
||
|
#ifdef HAS_QUAD_T
|
||
|
if (flags & QUADINT)
|
||
|
uqval = va_arg(ap, u_quad_t);
|
||
|
else
|
||
|
#endif
|
||
|
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
|
||
|
*/
|
||
|
ulval = (u_long)va_arg(ap, void *);
|
||
|
base = 16;
|
||
|
xdigs = "0123456789abcdef";
|
||
|
#ifdef HAS_QUAD_T
|
||
|
flags = (flags & ~QUADINT) | HEXPREFIX;
|
||
|
#else
|
||
|
flags |= HEXPREFIX;
|
||
|
#endif
|
||
|
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.
|
||
|
*/
|
||
|
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':
|
||
|
#ifdef HAS_QUAD_T
|
||
|
if (flags & QUADINT)
|
||
|
uqval = va_arg(ap, u_quad_t);
|
||
|
else
|
||
|
#endif
|
||
|
ulval = UARG();
|
||
|
base = 10;
|
||
|
goto nosign;
|
||
|
case 'X':
|
||
|
xdigs = "0123456789ABCDEF";
|
||
|
goto hex;
|
||
|
case 'x':
|
||
|
xdigs = "0123456789abcdef";
|
||
|
hex:
|
||
|
#ifdef HAS_QUAD_T
|
||
|
if (flags & QUADINT)
|
||
|
uqval = va_arg(ap, u_quad_t);
|
||
|
else
|
||
|
#endif
|
||
|
ulval = UARG();
|
||
|
base = 16;
|
||
|
/* leading 0x/X only if non-zero */
|
||
|
if (flags & ALT &&
|
||
|
#ifdef HAS_QUAD_T
|
||
|
(flags & QUADINT ? uqval != 0 : ulval != 0))
|
||
|
#else
|
||
|
(ulval != 0))
|
||
|
#endif
|
||
|
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;
|
||
|
#ifdef HAS_QUAD_T
|
||
|
if (flags & QUADINT) {
|
||
|
if (uqval != 0 || prec != 0)
|
||
|
cp = __uqtoa(uqval, cp, base,
|
||
|
flags & ALT, xdigs);
|
||
|
} else
|
||
|
#endif
|
||
|
{
|
||
|
if (ulval != 0 || prec != 0)
|
||
|
cp = __ultoa(ulval, cp, base,
|
||
|
flags & ALT, xdigs);
|
||
|
}
|
||
|
size = buf + BUF - cp;
|
||
|
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 (expt >= ndig &&
|
||
|
(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) {
|
||
|
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(double_spec_t 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)
|
||
|
{
|
||
|
register char *p, *t;
|
||
|
STATIC 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 */
|