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annotate packages/language/c/libc/stdlib/current/src/strtod.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
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children e0c0827131d1
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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 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //===========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): jlarmour
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35 // Contributors:
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36 // Date: 2000-04-30
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37 // Purpose:
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38 // Description:
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39 // Usage:
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40 //
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41 //####DESCRIPTIONEND####
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42 //
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43 //===========================================================================
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44
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45 // CONFIGURATION
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46
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47 #include <pkgconf/libc_stdlib.h> // Configuration header
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48
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49 // Include strtod()?
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50 #if defined(CYGFUN_LIBC_strtod)
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51
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52 // INCLUDES
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53
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54 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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55 #include <cyg/infra/cyg_trac.h> // Tracing support
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56 #include <cyg/infra/cyg_ass.h> // Assertion support
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57 #include <stddef.h> // NULL, wchar_t and size_t from compiler
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58 #include <stdlib.h> // Main header for stdlib functions
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59 #include <ctype.h> // isspace() and isdigit()
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60 #include <float.h> // DBL_MIN_10_EXP and DBL_MAX_10_EXP
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61 #include <math.h> // HUGE_VAL
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62 #include <errno.h> // errno
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63
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64 // CONSTANTS
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65
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66 #define MAXE (DBL_MAX_10_EXP)
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67 #define MINE (DBL_MIN_10_EXP)
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68
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69 // flags
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70 #define SIGN 0x01
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71 #define ESIGN 0x02
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72 #define DECP 0x04
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73
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74
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75 // MACROS
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76
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77 #define Ise(c) ((c == 'e') || (c == 'E') || (c == 'd') || (c == 'D'))
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78 #define Issign(c) ((c == '-') || (c == '+'))
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79 #define Val(c) ((c - '0'))
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80
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81
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82 // FUNCTIONS
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83
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84 /*
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85 * [atw] multiply 64 bit accumulator by 10 and add digit.
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86 * The KA/CA way to do this should be to use
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87 * a 64-bit integer internally and use "adjust" to
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88 * convert it to float at the end of processing.
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89 */
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90 static int
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91 ten_mul(double *acc, int digit)
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92 {
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93 /* [atw] Crude, but effective (at least on a KB)...
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94 */
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95 *acc *= 10;
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96 *acc += digit;
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97
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98 return 0; /* no overflow */
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99 } // ten_mul()
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100
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101
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102 /*
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103 * compute 10**x by successive squaring.
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104 */
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105
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106 static const double
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107 exp10(unsigned x)
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108 {
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109 static double powtab[] = {1.0,
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110 10.0,
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111 100.0,
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112 1000.0,
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113 10000.0};
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114
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115 if (x < (sizeof(powtab)/sizeof(double)))
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116 return powtab[x];
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117 else if (x & 1)
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118 return 10.0 * exp10(x-1);
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119 else
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120 return exp10(x/2) * exp10(x/2);
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121 } // exp10()
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122
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123
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124 /*
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125 * return (*acc) scaled by 10**dexp.
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126 */
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127
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128 static double
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129 adjust(double *acc, int dexp, int sign)
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130 /* *acc the 64 bit accumulator */
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131 /* dexp decimal exponent */
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132 /* sign sign flag */
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133 {
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134 double r;
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135
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136 if (dexp > MAXE)
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137 {
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138 errno = ERANGE;
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139 return (sign) ? -HUGE_VAL : HUGE_VAL;
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140 }
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141 else if (dexp < MINE)
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142 {
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143 errno = ERANGE;
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144 return 0.0;
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145 }
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146
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147 r = *acc;
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148 if (sign)
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149 r = -r;
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150 if (dexp==0)
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151 return r;
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152
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153 if (dexp < 0)
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154 return r / exp10(abs(dexp));
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155 else
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156 return r * exp10(dexp);
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157 } // adjust()
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158
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159
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160 externC double
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161 strtod( const char *nptr, char **endptr )
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162 {
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163 const char *start=nptr;
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164 double accum = 0.0;
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165 int flags = 0;
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166 int texp = 0;
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167 int e = 0;
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168 int conv_done = 0;
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169
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170 double retval;
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171
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172 CYG_REPORT_FUNCNAMETYPE( "strtod", "returning %f" );
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173
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174 CYG_CHECK_DATA_PTR( nptr, "nptr is an invalid pointer!" );
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175
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176 // endptr is allowed to be NULL, but if it isn't, we check it
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177 if (endptr != NULL)
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178 CYG_CHECK_DATA_PTR( endptr, "endptr is an invalid pointer!" );
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179
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180 while(isspace(*nptr)) nptr++;
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181 if(*nptr == '\0')
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182 { /* just leading spaces */
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183 if(endptr != NULL) *endptr = (char *)start;
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184 return 0.0;
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185 }
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186
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187
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188 if(Issign(*nptr))
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189 {
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190 if(*nptr == '-') flags = SIGN;
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191 if(*++nptr == '\0')
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192 { /* "+|-" : should be an error ? */
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193 if(endptr != NULL) *endptr = (char *)start;
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194 return 0.0;
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195 }
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196 }
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197
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198 for(; (isdigit(*nptr) || (*nptr == '.')); nptr++)
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199 {
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200 conv_done = 1;
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201 if(*nptr == '.')
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202 flags |= DECP;
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203 else
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204 {
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205 if( ten_mul(&accum, Val(*nptr)) ) texp++;
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206 if(flags & DECP) texp--;
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207 }
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208 }
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209
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210 if(Ise(*nptr))
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211 {
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212 conv_done = 1;
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213 if(*++nptr != '\0') /* skip e|E|d|D */
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214 { /* ! ([nptr]xxx[.[yyy]]e) */
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215
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216 while(isspace(*nptr)) nptr++; /* Ansi allows spaces after e */
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217 if(*nptr != '\0')
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218 { /* ! ([nptr]xxx[.[yyy]]e[space]) */
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219
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220 if(Issign(*nptr))
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221 if(*nptr++ == '-') flags |= ESIGN;
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222
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223 if(*nptr != '\0')
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224 { /* ! ([nptr]xxx[.[yyy]]e[nptr]) -- error?? */
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225
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226 for(; isdigit(*nptr); nptr++)
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227 if (e < MAXE) /* prevent from grossly overflowing */
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228 e = e*10 + Val(*nptr);
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229
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230 /* dont care what comes after this */
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231 if(flags & ESIGN)
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232 texp -= e;
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233 else
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234 texp += e;
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235 }
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236 }
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237 }
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238 }
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239
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240 if(endptr != NULL)
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241 *endptr = (char *)((conv_done) ? nptr : start);
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242
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243 retval = adjust(&accum, (int)texp, (int)(flags & SIGN));
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244
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245
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246 CYG_REPORT_RETVAL( retval );
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247
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248 return retval;
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249 } // strtod()
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250
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251
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252 #endif // if defined(CYGFUN_LIBC_strtod)
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253
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254 // EOF strtod.cxx