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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