[444] | 1 | /* |
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| 2 | * Copyright (c) 1990 The Regents of the University of California. |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * This code is derived from software contributed to Berkeley by |
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| 6 | * Chris Torek. |
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| 7 | * |
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| 8 | * Redistribution and use in source and binary forms, with or without |
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| 9 | * modification, are permitted provided that the following conditions |
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| 10 | * are met: |
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| 11 | * 1. Redistributions of source code must retain the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer. |
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
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| 14 | * notice, this list of conditions and the following disclaimer in the |
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| 15 | * documentation and/or other materials provided with the distribution. |
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| 16 | * 3. Neither the name of the University nor the names of its contributors |
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| 17 | * may be used to endorse or promote products derived from this software |
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| 18 | * without specific prior written permission. |
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| 19 | * |
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| 20 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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| 21 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 22 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 23 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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| 24 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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| 25 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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| 26 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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| 27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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| 28 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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| 29 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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| 30 | * SUCH DAMAGE. |
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| 31 | */ |
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| 32 | |
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| 33 | #include <newlib.h> |
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| 34 | |
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| 35 | #include <_ansi.h> |
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| 36 | #include <reent.h> |
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| 37 | #include <stdio.h> |
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| 38 | #include <stdlib.h> |
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| 39 | #include <string.h> |
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| 40 | #include <limits.h> |
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| 41 | #include <stdint.h> |
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| 42 | #include <wchar.h> |
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| 43 | #include <sys/lock.h> |
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| 44 | #include <stdarg.h> |
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| 45 | #include "local.h" |
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| 46 | #include "../stdlib/local.h" |
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| 47 | #include "fvwrite.h" |
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| 48 | #include "vfieeefp.h" |
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| 49 | #include "nano-vfprintf_local.h" |
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| 50 | |
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| 51 | char *__cvt (struct _reent *data, _PRINTF_FLOAT_TYPE value, int ndigits, |
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| 52 | int flags, char *sign, int *decpt, int ch, int *length, |
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| 53 | char *buf); |
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| 54 | |
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| 55 | int __exponent (char *p0, int exp, int fmtch); |
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| 56 | |
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| 57 | #ifdef FLOATING_POINT |
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| 58 | |
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| 59 | /* Using reentrant DATA, convert finite VALUE into a string of digits |
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| 60 | with no decimal point, using NDIGITS precision and FLAGS as guides |
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| 61 | to whether trailing zeros must be included. Set *SIGN to nonzero |
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| 62 | if VALUE was negative. Set *DECPT to the exponent plus one. Set |
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| 63 | *LENGTH to the length of the returned string. CH must be one of |
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| 64 | [aAeEfFgG]; if it is [aA], then the return string lives in BUF, |
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| 65 | otherwise the return value shares the mprec reentrant storage. */ |
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| 66 | char * |
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| 67 | __cvt (struct _reent *data, _PRINTF_FLOAT_TYPE value, int ndigits, int flags, |
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| 68 | char *sign, int *decpt, int ch, int *length, char *buf) |
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| 69 | { |
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| 70 | int mode, dsgn; |
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| 71 | char *digits, *bp, *rve; |
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| 72 | union double_union tmp; |
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| 73 | |
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| 74 | tmp.d = value; |
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| 75 | /* This will check for "< 0" and "-0.0". */ |
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| 76 | if (word0 (tmp) & Sign_bit) |
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| 77 | { |
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| 78 | value = -value; |
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| 79 | *sign = '-'; |
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| 80 | } |
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| 81 | else |
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| 82 | *sign = '\000'; |
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| 83 | |
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| 84 | if (ch == 'f' || ch == 'F') |
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| 85 | { |
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| 86 | /* Ndigits after the decimal point. */ |
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| 87 | mode = 3; |
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| 88 | } |
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| 89 | else |
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| 90 | { |
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| 91 | /* To obtain ndigits after the decimal point for the 'e' |
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| 92 | and 'E' formats, round to ndigits + 1 significant figures. */ |
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| 93 | if (ch == 'e' || ch == 'E') |
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| 94 | { |
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| 95 | ndigits++; |
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| 96 | } |
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| 97 | /* Ndigits significant digits. */ |
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| 98 | mode = 2; |
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| 99 | } |
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| 100 | |
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| 101 | digits = _DTOA_R (data, value, mode, ndigits, decpt, &dsgn, &rve); |
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| 102 | |
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| 103 | /* Print trailing zeros. */ |
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| 104 | if ((ch != 'g' && ch != 'G') || flags & ALT) |
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| 105 | { |
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| 106 | bp = digits + ndigits; |
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| 107 | if (ch == 'f' || ch == 'F') |
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| 108 | { |
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| 109 | if (*digits == '0' && value) |
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| 110 | *decpt = -ndigits + 1; |
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| 111 | bp += *decpt; |
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| 112 | } |
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| 113 | /* Kludge for __dtoa irregularity. */ |
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| 114 | if (value == 0) |
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| 115 | rve = bp; |
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| 116 | while (rve < bp) |
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| 117 | *rve++ = '0'; |
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| 118 | } |
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| 119 | *length = rve - digits; |
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| 120 | return (digits); |
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| 121 | } |
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| 122 | |
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| 123 | /* This function is copied from exponent in vfprintf.c with support for |
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| 124 | C99 formats removed. We don't use the original function in order to |
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| 125 | decouple nano implementation of formatted IO from the Newlib one. */ |
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| 126 | int |
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| 127 | __exponent (char *p0, int exp, int fmtch) |
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| 128 | { |
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| 129 | register char *p, *t; |
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| 130 | char expbuf[MAXEXPLEN]; |
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| 131 | #define isa 0 |
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| 132 | |
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| 133 | p = p0; |
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| 134 | *p++ = isa ? 'p' - 'a' + fmtch : fmtch; |
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| 135 | if (exp < 0) |
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| 136 | { |
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| 137 | exp = -exp; |
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| 138 | *p++ = '-'; |
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| 139 | } |
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| 140 | else |
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| 141 | *p++ = '+'; |
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| 142 | t = expbuf + MAXEXPLEN; |
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| 143 | if (exp > 9) |
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| 144 | { |
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| 145 | do |
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| 146 | { |
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| 147 | *--t = to_char (exp % 10); |
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| 148 | } |
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| 149 | while ((exp /= 10) > 9); |
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| 150 | *--t = to_char (exp); |
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| 151 | for (; t < expbuf + MAXEXPLEN; *p++ = *t++); |
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| 152 | } |
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| 153 | else |
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| 154 | { |
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| 155 | if (!isa) |
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| 156 | *p++ = '0'; |
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| 157 | *p++ = to_char (exp); |
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| 158 | } |
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| 159 | return (p - p0); |
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| 160 | } |
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| 161 | |
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| 162 | /* Decode and print floating point number specified by "eEfgG". */ |
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| 163 | int |
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| 164 | _printf_float (struct _reent *data, |
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| 165 | struct _prt_data_t *pdata, |
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| 166 | FILE * fp, |
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| 167 | int (*pfunc) (struct _reent *, FILE *, const char *, |
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| 168 | size_t len), va_list * ap) |
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| 169 | { |
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| 170 | #define _fpvalue (pdata->_double_) |
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| 171 | |
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| 172 | char *decimal_point = _localeconv_r (data)->decimal_point; |
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| 173 | size_t decp_len = strlen (decimal_point); |
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| 174 | /* Temporary negative sign for floats. */ |
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| 175 | char softsign; |
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| 176 | /* Integer value of exponent. */ |
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| 177 | int expt; |
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| 178 | /* Character count for expstr. */ |
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| 179 | int expsize = 0; |
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| 180 | /* Actual number of digits returned by cvt. */ |
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| 181 | int ndig = 0; |
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| 182 | char *cp; |
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| 183 | int n; |
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| 184 | /* Field size expanded by dprec(not for _printf_float). */ |
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| 185 | int realsz; |
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| 186 | char code = pdata->code; |
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| 187 | |
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| 188 | if (pdata->flags & LONGDBL) |
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| 189 | { |
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| 190 | _fpvalue = (double) GET_ARG (N, *ap, _LONG_DOUBLE); |
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| 191 | } |
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| 192 | else |
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| 193 | { |
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| 194 | _fpvalue = GET_ARG (N, *ap, double); |
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| 195 | } |
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| 196 | |
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| 197 | /* Do this before tricky precision changes. |
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| 198 | |
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| 199 | If the output is infinite or NaN, leading |
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| 200 | zeros are not permitted. Otherwise, scanf |
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| 201 | could not read what printf wrote. */ |
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| 202 | if (isinf (_fpvalue)) |
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| 203 | { |
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| 204 | if (_fpvalue < 0) |
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| 205 | pdata->l_buf[0] = '-'; |
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| 206 | if (code <= 'G') /* 'A', 'E', 'F', or 'G'. */ |
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| 207 | cp = "INF"; |
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| 208 | else |
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| 209 | cp = "inf"; |
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| 210 | pdata->size = 3; |
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| 211 | pdata->flags &= ~ZEROPAD; |
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| 212 | goto print_float; |
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| 213 | } |
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| 214 | if (isnan (_fpvalue)) |
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| 215 | { |
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| 216 | if (code <= 'G') /* 'A', 'E', 'F', or 'G'. */ |
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| 217 | cp = "NAN"; |
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| 218 | else |
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| 219 | cp = "nan"; |
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| 220 | pdata->size = 3; |
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| 221 | pdata->flags &= ~ZEROPAD; |
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| 222 | goto print_float; |
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| 223 | } |
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| 224 | |
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| 225 | if (pdata->prec == -1) |
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| 226 | { |
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| 227 | pdata->prec = DEFPREC; |
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| 228 | } |
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| 229 | else if ((code == 'g' || code == 'G') && pdata->prec == 0) |
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| 230 | { |
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| 231 | pdata->prec = 1; |
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| 232 | } |
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| 233 | |
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| 234 | pdata->flags |= FPT; |
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| 235 | |
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| 236 | cp = __cvt (data, _fpvalue, pdata->prec, pdata->flags, &softsign, |
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| 237 | &expt, code, &ndig, cp); |
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| 238 | |
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| 239 | if (code == 'g' || code == 'G') |
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| 240 | { |
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| 241 | if (expt <= -4 || expt > pdata->prec) |
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| 242 | /* 'e' or 'E'. */ |
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| 243 | code -= 2; |
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| 244 | else |
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| 245 | code = 'g'; |
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| 246 | } |
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| 247 | if (code <= 'e') |
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| 248 | { |
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| 249 | /* 'a', 'A', 'e', or 'E' fmt. */ |
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| 250 | --expt; |
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| 251 | expsize = __exponent (pdata->expstr, expt, code); |
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| 252 | pdata->size = expsize + ndig; |
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| 253 | if (ndig > 1 || pdata->flags & ALT) |
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| 254 | ++pdata->size; |
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| 255 | } |
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| 256 | else |
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| 257 | { |
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| 258 | if (code == 'f') |
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| 259 | { |
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| 260 | /* 'f' fmt. */ |
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| 261 | if (expt > 0) |
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| 262 | { |
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| 263 | pdata->size = expt; |
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| 264 | if (pdata->prec || pdata->flags & ALT) |
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| 265 | pdata->size += pdata->prec + 1; |
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| 266 | } |
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| 267 | else |
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| 268 | /* "0.X". */ |
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| 269 | pdata->size = (pdata->prec || pdata->flags & ALT) |
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| 270 | ? pdata->prec + 2 : 1; |
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| 271 | } |
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| 272 | else if (expt >= ndig) |
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| 273 | { |
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| 274 | /* Fixed g fmt. */ |
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| 275 | pdata->size = expt; |
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| 276 | if (pdata->flags & ALT) |
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| 277 | ++pdata->size; |
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| 278 | } |
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| 279 | else |
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| 280 | pdata->size = ndig + (expt > 0 ? 1 : 2 - expt); |
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| 281 | pdata->lead = expt; |
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| 282 | } |
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| 283 | |
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| 284 | if (softsign) |
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| 285 | pdata->l_buf[0] = '-'; |
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| 286 | print_float: |
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| 287 | if (_printf_common (data, pdata, &realsz, fp, pfunc) == -1) |
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| 288 | goto error; |
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| 289 | |
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| 290 | if ((pdata->flags & FPT) == 0) |
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| 291 | { |
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| 292 | PRINT (cp, pdata->size); |
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| 293 | } |
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| 294 | else |
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| 295 | { |
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| 296 | /* Glue together f_p fragments. */ |
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| 297 | if (code >= 'f') |
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| 298 | { |
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| 299 | /* 'f' or 'g'. */ |
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| 300 | if (_fpvalue == 0) |
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| 301 | { |
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| 302 | /* Kludge for __dtoa irregularity. */ |
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| 303 | PRINT ("0", 1); |
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| 304 | if (expt < ndig || pdata->flags & ALT) |
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| 305 | { |
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| 306 | PRINT (decimal_point, decp_len); |
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| 307 | PAD (ndig - 1, pdata->zero); |
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| 308 | } |
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| 309 | } |
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| 310 | else if (expt <= 0) |
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| 311 | { |
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| 312 | PRINT ("0", 1); |
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| 313 | if (expt || ndig || pdata->flags & ALT) |
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| 314 | { |
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| 315 | PRINT (decimal_point, decp_len); |
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| 316 | PAD (-expt, pdata->zero); |
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| 317 | PRINT (cp, ndig); |
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| 318 | } |
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| 319 | } |
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| 320 | else |
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| 321 | { |
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| 322 | char *convbuf = cp; |
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| 323 | PRINTANDPAD (cp, convbuf + ndig, pdata->lead, pdata->zero); |
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| 324 | cp += pdata->lead; |
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| 325 | if (expt < ndig || pdata->flags & ALT) |
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| 326 | PRINT (decimal_point, decp_len); |
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| 327 | PRINTANDPAD (cp, convbuf + ndig, ndig - expt, pdata->zero); |
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| 328 | } |
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| 329 | } |
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| 330 | else |
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| 331 | { |
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| 332 | /* 'a', 'A', 'e', or 'E'. */ |
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| 333 | if (ndig > 1 || pdata->flags & ALT) |
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| 334 | { |
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| 335 | PRINT (cp, 1); |
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| 336 | cp++; |
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| 337 | PRINT (decimal_point, decp_len); |
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| 338 | if (_fpvalue) |
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| 339 | { |
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| 340 | PRINT (cp, ndig - 1); |
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| 341 | } |
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| 342 | /* "0.[0..]". */ |
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| 343 | else |
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| 344 | /* __dtoa irregularity. */ |
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| 345 | PAD (ndig - 1, pdata->zero); |
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| 346 | } |
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| 347 | else /* "XeYYY". */ |
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| 348 | PRINT (cp, 1); |
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| 349 | PRINT (pdata->expstr, expsize); |
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| 350 | } |
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| 351 | } |
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| 352 | |
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| 353 | /* Left-adjusting padding (always blank). */ |
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| 354 | if (pdata->flags & LADJUST) |
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| 355 | PAD (pdata->width - realsz, pdata->blank); |
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| 356 | |
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| 357 | return (pdata->width > realsz ? pdata->width : realsz); |
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| 358 | error: |
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| 359 | return -1; |
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| 360 | |
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| 361 | #undef _fpvalue |
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| 362 | } |
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| 363 | |
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| 364 | #endif |
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