Mercurial > flash_v2

annotate packages/language/c/libc/stdlib/current/src/strtod.cxx @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children
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1 //===========================================================================
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2 //
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3 // strtod.cxx
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4 //
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5 // ISO String to double-precision floating point conversion
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6 //
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7 //===========================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
115
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40 //===========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): jlarmour
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44 // Contributors:
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45 // Date: 2000-04-30
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46 // Purpose:
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47 // Description:
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48 // Usage:
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //===========================================================================
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53
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54 // CONFIGURATION
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55
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56 #include <pkgconf/libc_stdlib.h> // Configuration header
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57
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58 // Include strtod()?
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59 #if defined(CYGFUN_LIBC_strtod)
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60
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61 // INCLUDES
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62
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63 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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64 #include <cyg/infra/cyg_trac.h> // Tracing support
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65 #include <cyg/infra/cyg_ass.h> // Assertion support
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66 #include <stddef.h> // NULL, wchar_t and size_t from compiler
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67 #include <stdlib.h> // Main header for stdlib functions
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68 #include <ctype.h> // isspace() and isdigit()
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69 #include <float.h> // DBL_MIN_10_EXP and DBL_MAX_10_EXP
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70 #include <math.h> // HUGE_VAL
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71 #include <errno.h> // errno
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72
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73 // CONSTANTS
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74
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75 #define MAXE (DBL_MAX_10_EXP)
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76 #define MINE (DBL_MIN_10_EXP)
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77
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78 // flags
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79 #define SIGN 0x01
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80 #define ESIGN 0x02
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81 #define DECP 0x04
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82
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83
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84 // MACROS
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85
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86 #define Ise(c) ((c == 'e') || (c == 'E') || (c == 'd') || (c == 'D'))
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87 #define Issign(c) ((c == '-') || (c == '+'))
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88 #define Val(c) ((c - '0'))
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89
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90
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91 // FUNCTIONS
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92
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93 /*
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94 * [atw] multiply 64 bit accumulator by 10 and add digit.
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95 * The KA/CA way to do this should be to use
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96 * a 64-bit integer internally and use "adjust" to
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97 * convert it to float at the end of processing.
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98 */
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99 static int
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100 ten_mul(double *acc, int digit)
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101 {
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102 /* [atw] Crude, but effective (at least on a KB)...
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103 */
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104 *acc *= 10;
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105 *acc += digit;
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106
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107 return 0; /* no overflow */
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108 } // ten_mul()
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109
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110
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111 /*
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112 * compute 10**x by successive squaring.
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113 */
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114
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115 static const double
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116 exp10(unsigned x)
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117 {
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118 static double powtab[] = {1.0,
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119 10.0,
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120 100.0,
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121 1000.0,
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122 10000.0};
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123
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124 if (x < (sizeof(powtab)/sizeof(double)))
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125 return powtab[x];
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126 else if (x & 1)
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127 return 10.0 * exp10(x-1);
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128 else
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129 return exp10(x/2) * exp10(x/2);
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130 } // exp10()
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131
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132
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133 /*
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134 * return (*acc) scaled by 10**dexp.
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135 */
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136
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137 static double
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138 adjust(double *acc, int dexp, int sign)
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139 /* *acc the 64 bit accumulator */
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140 /* dexp decimal exponent */
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141 /* sign sign flag */
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142 {
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143 double r;
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144
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145 if (dexp > MAXE)
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146 {
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147 errno = ERANGE;
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148 return (sign) ? -HUGE_VAL : HUGE_VAL;
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149 }
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150 else if (dexp < MINE)
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151 {
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152 errno = ERANGE;
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153 return 0.0;
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154 }
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155
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156 r = *acc;
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157 if (sign)
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158 r = -r;
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159 if (dexp==0)
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160 return r;
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161
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162 if (dexp < 0)
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163 return r / exp10(abs(dexp));
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164 else
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165 return r * exp10(dexp);
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166 } // adjust()
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167
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168
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169 externC double
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170 strtod( const char *nptr, char **endptr )
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171 {
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172 const char *start=nptr;
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173 double accum = 0.0;
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174 int flags = 0;
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175 int texp = 0;
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176 int e = 0;
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177 int conv_done = 0;
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178
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179 double retval;
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180
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181 CYG_REPORT_FUNCNAMETYPE( "strtod", "returning %f" );
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182
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183 CYG_CHECK_DATA_PTR( nptr, "nptr is an invalid pointer!" );
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184
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185 // endptr is allowed to be NULL, but if it isn't, we check it
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186 if (endptr != NULL)
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187 CYG_CHECK_DATA_PTR( endptr, "endptr is an invalid pointer!" );
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188
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189 while(isspace(*nptr)) nptr++;
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190 if(*nptr == '\0')
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191 { /* just leading spaces */
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192 if(endptr != NULL) *endptr = (char *)start;
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193 return 0.0;
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194 }
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195
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196
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197 if(Issign(*nptr))
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198 {
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199 if(*nptr == '-') flags = SIGN;
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200 if(*++nptr == '\0')
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201 { /* "+|-" : should be an error ? */
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202 if(endptr != NULL) *endptr = (char *)start;
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203 return 0.0;
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204 }
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205 }
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206
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207 for(; (isdigit(*nptr) || (*nptr == '.')); nptr++)
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208 {
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209 conv_done = 1;
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210 if(*nptr == '.')
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211 flags |= DECP;
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212 else
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213 {
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214 if( ten_mul(&accum, Val(*nptr)) ) texp++;
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215 if(flags & DECP) texp--;
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216 }
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217 }
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218
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219 if(Ise(*nptr))
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220 {
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221 conv_done = 1;
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222 if(*++nptr != '\0') /* skip e|E|d|D */
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223 { /* ! ([nptr]xxx[.[yyy]]e) */
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224
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225 while(isspace(*nptr)) nptr++; /* Ansi allows spaces after e */
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226 if(*nptr != '\0')
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227 { /* ! ([nptr]xxx[.[yyy]]e[space]) */
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228
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229 if(Issign(*nptr))
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230 if(*nptr++ == '-') flags |= ESIGN;
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231
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232 if(*nptr != '\0')
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233 { /* ! ([nptr]xxx[.[yyy]]e[nptr]) -- error?? */
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234
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235 for(; isdigit(*nptr); nptr++)
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236 if (e < MAXE) /* prevent from grossly overflowing */
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237 e = e*10 + Val(*nptr);
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238
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239 /* dont care what comes after this */
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240 if(flags & ESIGN)
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241 texp -= e;
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242 else
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243 texp += e;
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244 }
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245 }
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246 }
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247 }
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248
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249 if(endptr != NULL)
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250 *endptr = (char *)((conv_done) ? nptr : start);
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251
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252 retval = adjust(&accum, (int)texp, (int)(flags & SIGN));
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253
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254
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255 CYG_REPORT_RETVAL( retval );
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256
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257 return retval;
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258 } // strtod()
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259
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260
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261 #endif // if defined(CYGFUN_LIBC_strtod)
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262
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263 // EOF strtod.cxx