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Diffstat (limited to 'newlib/libc/stdio/vfprintf.c')
| -rw-r--r-- | newlib/libc/stdio/vfprintf.c | 939 |
1 files changed, 939 insertions, 0 deletions
diff --git a/newlib/libc/stdio/vfprintf.c b/newlib/libc/stdio/vfprintf.c new file mode 100644 index 0000000..4b2043e --- /dev/null +++ b/newlib/libc/stdio/vfprintf.c @@ -0,0 +1,939 @@ +/* +FUNCTION +<<vprintf>>, <<vfprintf>>, <<vsprintf>>---format argument list + +INDEX + vprintf +INDEX + vfprintf +INDEX + vsprintf +INDEX + vsnprintf + +ANSI_SYNOPSIS + #include <stdio.h> + #include <stdarg.h> + int vprintf(const char *<[fmt]>, va_list <[list]>); + int vfprintf(FILE *<[fp]>, const char *<[fmt]>, va_list <[list]>); + int vsprintf(char *<[str]>, const char *<[fmt]>, va_list <[list]>); + int vsnprintf(char *<[str]>, size_t <[size]>, const char *<[fmt]>, va_list <[list]>); + + int _vprintf_r(void *<[reent]>, const char *<[fmt]>, + va_list <[list]>); + int _vfprintf_r(void *<[reent]>, FILE *<[fp]>, const char *<[fmt]>, + va_list <[list]>); + int _vsprintf_r(void *<[reent]>, char *<[str]>, const char *<[fmt]>, + va_list <[list]>); + int _vsnprintf_r(void *<[reent]>, char *<[str]>, size_t <[size]>, const char *<[fmt]>, + va_list <[list]>); + +TRAD_SYNOPSIS + #include <stdio.h> + #include <varargs.h> + int vprintf( <[fmt]>, <[list]>) + char *<[fmt]>; + va_list <[list]>; + + int vfprintf(<[fp]>, <[fmt]>, <[list]>) + FILE *<[fp]>; + char *<[fmt]>; + va_list <[list]>; + + int vsprintf(<[str]>, <[fmt]>, <[list]>) + char *<[str]>; + char *<[fmt]>; + va_list <[list]>; + + int vsnprintf(<[str]>, <[size]>, <[fmt]>, <[list]>) + char *<[str]>; + size_t <[size]>; + char *<[fmt]>; + va_list <[list]>; + + int _vprintf_r(<[reent]>, <[fmt]>, <[list]>) + char *<[reent]>; + char *<[fmt]>; + va_list <[list]>; + + int _vfprintf_r(<[reent]>, <[fp]>, <[fmt]>, <[list]>) + char *<[reent]>; + FILE *<[fp]>; + char *<[fmt]>; + va_list <[list]>; + + int _vsprintf_r(<[reent]>, <[str]>, <[fmt]>, <[list]>) + char *<[reent]>; + char *<[str]>; + char *<[fmt]>; + va_list <[list]>; + + int _vsnprintf_r(<[reent]>, <[str]>, <[size]>, <[fmt]>, <[list]>) + char *<[reent]>; + char *<[str]>; + size_t <[size]>; + char *<[fmt]>; + va_list <[list]>; + +DESCRIPTION +<<vprintf>>, <<vfprintf>>, <<vsprintf>> and <<vsnprintf>> are (respectively) +variants of <<printf>>, <<fprintf>>, <<sprintf>> and <<snprintf>>. They differ +only in allowing their caller to pass the variable argument list as a +<<va_list>> object (initialized by <<va_start>>) rather than directly +accepting a variable number of arguments. + +RETURNS +The return values are consistent with the corresponding functions: +<<vsprintf>> returns the number of bytes in the output string, +save that the concluding <<NULL>> is not counted. +<<vprintf>> and <<vfprintf>> return the number of characters transmitted. +If an error occurs, <<vprintf>> and <<vfprintf>> return <<EOF>>. No +error returns occur for <<vsprintf>>. + +PORTABILITY +ANSI C requires all three functions. + +Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, +<<lseek>>, <<read>>, <<sbrk>>, <<write>>. +*/ + +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Chris Torek. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#if defined(LIBC_SCCS) && !defined(lint) +/*static char *sccsid = "from: @(#)vfprintf.c 5.50 (Berkeley) 12/16/92";*/ +static char *rcsid = "$Id$"; +#endif /* LIBC_SCCS and not lint */ + +/* + * Actual printf innards. + * + * This code is large and complicated... + */ + +#ifdef INTEGER_ONLY +#define VFPRINTF vfiprintf +#define _VFPRINTF_R _vfiprintf_r +#else +#define VFPRINTF vfprintf +#define _VFPRINTF_R _vfprintf_r +#define FLOATING_POINT +#endif + +#define _NO_LONGLONG +#if defined WANT_PRINTF_LONG_LONG && defined __GNUC__ +# undef _NO_LONGLONG +#endif + +#include <_ansi.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <reent.h> + +#ifdef _HAVE_STDC +#include <stdarg.h> +#else +#include <varargs.h> +#endif + +#include "local.h" +#include "fvwrite.h" +#include "vfieeefp.h" + +/* + * Flush out all the vectors defined by the given uio, + * then reset it so that it can be reused. + */ +static int +__sprint(fp, uio) + FILE *fp; + register struct __suio *uio; +{ + register int err; + + if (uio->uio_resid == 0) { + uio->uio_iovcnt = 0; + return (0); + } + err = __sfvwrite(fp, uio); + uio->uio_resid = 0; + uio->uio_iovcnt = 0; + return (err); +} + +/* + * Helper function for `fprintf to unbuffered unix file': creates a + * temporary buffer. We only work on write-only files; this avoids + * worries about ungetc buffers and so forth. + */ +static int +__sbprintf(fp, fmt, ap) + register FILE *fp; + const char *fmt; + va_list ap; +{ + int ret; + FILE fake; + unsigned char buf[BUFSIZ]; + + /* copy the important variables */ + fake._data = fp->_data; + fake._flags = fp->_flags & ~__SNBF; + fake._file = fp->_file; + fake._cookie = fp->_cookie; + fake._write = fp->_write; + + /* set up the buffer */ + fake._bf._base = fake._p = buf; + fake._bf._size = fake._w = sizeof(buf); + fake._lbfsize = 0; /* not actually used, but Just In Case */ + + /* do the work, then copy any error status */ + ret = VFPRINTF(&fake, fmt, ap); + if (ret >= 0 && fflush(&fake)) + ret = EOF; + if (fake._flags & __SERR) + fp->_flags |= __SERR; + return (ret); +} + + +#ifdef FLOATING_POINT +#include <locale.h> +#include <math.h> +#include "floatio.h" + +#define BUF (MAXEXP+MAXFRACT+1) /* + decimal point */ +#define DEFPREC 6 + +static char *cvt _PARAMS((struct _reent *, double, int, int, char *, int *, int, int *)); +static int exponent _PARAMS((char *, int, int)); + +#else /* no FLOATING_POINT */ + +#define BUF 40 + +#endif /* FLOATING_POINT */ + + +/* + * Macros for converting digits to letters and vice versa + */ +#define to_digit(c) ((c) - '0') +#define is_digit(c) ((unsigned)to_digit(c) <= 9) +#define to_char(n) ((n) + '0') + +/* + * Flags used during conversion. + */ +#define ALT 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 */ +#define QUADINT 0x020 /* quad integer */ +#define SHORTINT 0x040 /* short integer */ +#define ZEROPAD 0x080 /* zero (as opposed to blank) pad */ +#define FPT 0x100 /* Floating point number */ + +int +_DEFUN (VFPRINTF, (fp, fmt0, ap), + FILE * fp _AND + _CONST char *fmt0 _AND + va_list ap) +{ + return _VFPRINTF_R (fp->_data, fp, fmt0, ap); +} + +int +_DEFUN (_VFPRINTF_R, (data, fp, fmt0, ap), + struct _reent *data _AND + FILE * fp _AND + _CONST char *fmt0 _AND + va_list ap) +{ + register char *fmt; /* format string */ + register int ch; /* character from fmt */ + register int n, m; /* handy integers (short term usage) */ + register char *cp; /* handy char pointer (short term usage) */ + register struct __siov *iovp;/* for PRINT macro */ + register int flags; /* flags as above */ + int ret; /* return value accumulator */ + int width; /* width from format (%8d), or 0 */ + int prec; /* precision from format (%.3d), or -1 */ + char sign; /* sign prefix (' ', '+', '-', or \0) */ + wchar_t wc; +#ifdef FLOATING_POINT + char *decimal_point = localeconv()->decimal_point; + char softsign; /* temporary negative sign for floats */ + double _double; /* double precision arguments %[eEfgG] */ + int expt; /* integer value of exponent */ + int expsize; /* character count for expstr */ + int ndig; /* actual number of digits returned by cvt */ + char expstr[7]; /* buffer for exponent string */ +#endif + +#ifndef _NO_LONGLONG +#define quad_t long long +#define u_quad_t unsigned long long +#endif + +#ifndef _NO_LONGLONG + u_quad_t _uquad; /* integer arguments %[diouxX] */ +#else + u_long _uquad; +#endif + enum { OCT, DEC, HEX } base;/* base for [diouxX] conversion */ + int dprec; /* a copy of prec if [diouxX], 0 otherwise */ + int realsz; /* field size expanded by dprec */ + int size; /* size of converted field or string */ + char *xdigs; /* digits for [xX] conversion */ +#define NIOV 8 + struct __suio uio; /* output information: summary */ + struct __siov iov[NIOV];/* ... and individual io vectors */ + char buf[BUF]; /* space for %c, %[diouxX], %[eEfgG] */ + char ox[2]; /* space for 0x hex-prefix */ + int state = 0; /* mbtowc calls from library must not change state */ + + /* + * Choose PADSIZE to trade efficiency vs. size. If larger printf + * fields occur frequently, increase PADSIZE and make the initialisers + * below longer. + */ +#define PADSIZE 16 /* pad chunk size */ + static _CONST char blanks[PADSIZE] = + {' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' '}; + static _CONST char zeroes[PADSIZE] = + {'0','0','0','0','0','0','0','0','0','0','0','0','0','0','0','0'}; + + /* + * BEWARE, these `goto error' on error, and PAD uses `n'. + */ +#define PRINT(ptr, len) { \ + 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. + */ +#ifndef _NO_LONGLONG +#define SARG() \ + (flags&QUADINT ? va_arg(ap, quad_t) : \ + flags&LONGINT ? va_arg(ap, long) : \ + flags&SHORTINT ? (long)(short)va_arg(ap, int) : \ + (long)va_arg(ap, int)) +#define UARG() \ + (flags&QUADINT ? va_arg(ap, u_quad_t) : \ + flags&LONGINT ? va_arg(ap, u_long) : \ + flags&SHORTINT ? (u_long)(u_short)va_arg(ap, int) : \ + (u_long)va_arg(ap, u_int)) +#else +#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)) +#endif + + CHECK_INIT (fp); + + /* 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 (;;) { + cp = fmt; + while ((n = _mbtowc_r(_REENT, &wc, fmt, MB_CUR_MAX, &state)) > 0) { + fmt += n; + if (wc == '%') { + fmt--; + break; + } + } + if ((m = fmt - cp) != 0) { + PRINT(cp, m); + ret += m; + } + if (n <= 0) + goto done; + fmt++; /* skip over '%' */ + + flags = 0; + dprec = 0; + width = 0; + prec = -1; + sign = '\0'; + +rflag: ch = *fmt++; +reswitch: switch (ch) { + case ' ': + /* + * ``If the space and + flags both appear, the space + * flag will be ignored.'' + * -- ANSI X3J11 + */ + if (!sign) + sign = ' '; + goto rflag; + case '#': + flags |= ALT; + goto rflag; + case '*': + /* + * ``A negative field width argument is taken as a + * - flag followed by a positive field width.'' + * -- ANSI X3J11 + * They don't exclude field widths read from args. + */ + 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': + if (*fmt == 'l') { + fmt++; + flags |= QUADINT; + } else { + flags |= LONGINT; + } + goto rflag; + case 'q': + flags |= QUADINT; + goto rflag; + case 'c': + *(cp = buf) = va_arg(ap, int); + size = 1; + sign = '\0'; + break; + case 'D': + flags |= LONGINT; + /*FALLTHROUGH*/ + case 'd': + case 'i': + _uquad = SARG(); +#ifndef _NO_LONGLONG + if ((quad_t)_uquad < 0) +#else + if ((long) _uquad < 0) +#endif + { + + _uquad = -_uquad; + sign = '-'; + } + base = DEC; + goto number; +#ifdef FLOATING_POINT + case 'e': + case 'E': + case 'f': + case 'g': + case 'G': + if (prec == -1) { + prec = DEFPREC; + } else if ((ch == 'g' || ch == 'G') && prec == 0) { + prec = 1; + } + + if (flags & LONGDBL) { + _double = (double) va_arg(ap, long double); + } else { + _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(data, _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': +#ifndef _NO_LONGLONG + 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': + _uquad = UARG(); + base = OCT; + goto nosign; + case 'p': + /* + * ``The argument shall be a pointer to void. The + * value of the pointer is converted to a sequence + * of printable characters, in an implementation- + * defined manner.'' + * -- ANSI X3J11 + */ + /* NOSTRICT */ + _uquad = (u_long)(unsigned _POINTER_INT)va_arg(ap, void *); + base = HEX; + xdigs = "0123456789abcdef"; + flags |= HEXPREFIX; + 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': + _uquad = UARG(); + base = DEC; + goto nosign; + case 'X': + xdigs = "0123456789ABCDEF"; + goto hex; + case 'x': + xdigs = "0123456789abcdef"; +hex: _uquad = UARG(); + base = HEX; + /* leading 0x/X only if non-zero */ + if (flags & ALT && _uquad != 0) + flags |= HEXPREFIX; + + /* unsigned conversions */ +nosign: sign = '\0'; + /* + * ``... diouXx conversions ... if a precision is + * specified, the 0 flag will be ignored.'' + * -- ANSI X3J11 + */ +number: if ((dprec = prec) >= 0) + flags &= ~ZEROPAD; + + /* + * ``The result of converting a zero value with an + * explicit precision of zero is no characters.'' + * -- ANSI X3J11 + */ + cp = buf + BUF; + if (_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. + * size excludes decimal prec; realsz includes it. + */ + realsz = dprec > size ? dprec : size; + if (sign) + realsz++; + else if (flags & HEXPREFIX) + realsz+= 2; + + /* right-adjusting blank padding */ + if ((flags & (LADJUST|ZEROPAD)) == 0) + PAD(width - realsz, blanks); + + /* prefix */ + if (sign) { + PRINT(&sign, 1); + } else if (flags & HEXPREFIX) { + ox[0] = '0'; + ox[1] = ch; + PRINT(ox, 2); + } + + /* right-adjusting zero padding */ + if ((flags & (LADJUST|ZEROPAD)) == ZEROPAD) + PAD(width - realsz, zeroes); + + /* leading zeroes from decimal precision */ + PAD(dprec - size, zeroes); + + /* the string or number proper */ +#ifdef FLOATING_POINT + if ((flags & FPT) == 0) { + PRINT(cp, size); + } else { /* glue together f_p fragments */ + if (ch >= 'f') { /* 'f' or 'g' */ + if (_double == 0) { + /* kludge for __dtoa irregularity */ + PRINT("0", 1); + if (expt < ndig || (flags & ALT) != 0) { + PRINT(decimal_point, 1); + PAD(ndig - 1, zeroes); + } + } else if (expt <= 0) { + PRINT("0", 1); + PRINT(decimal_point, 1); + PAD(-expt, zeroes); + PRINT(cp, ndig); + } else if (expt >= ndig) { + PRINT(cp, ndig); + PAD(expt - ndig, zeroes); + if (flags & ALT) + PRINT(".", 1); + } else { + PRINT(cp, expt); + cp += expt; + PRINT(".", 1); + PRINT(cp, ndig-expt); + } + } else { /* 'e' or 'E' */ + if (ndig > 1 || flags & ALT) { + ox[0] = *cp++; + ox[1] = '.'; + PRINT(ox, 2); + if (_double || 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_r _PARAMS((struct _reent *, double, int, + int, int *, int *, char **)); + +static char * +cvt(data, value, ndigits, flags, sign, decpt, ch, length) + struct _reent *data; + double value; + int ndigits, flags, *decpt, ch, *length; + char *sign; +{ + int mode, dsgn; + char *digits, *bp, *rve; + union double_union tmp; + + 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 */ + } + + tmp.d = value; + if (word0(tmp) & Sign_bit) { /* this will check for < 0 and -0.0 */ + value = -value; + *sign = '-'; + } else + *sign = '\000'; + digits = _dtoa_r(data, 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(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 */ |