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1 //=========================================================================== |
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2 // |
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3 // strtoul.cxx |
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4 // |
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5 // ANSI standard string to long int conversion function defined in |
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6 // section 7.10.1.6 of the standard |
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7 // |
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8 //=========================================================================== |
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9 //####COPYRIGHTBEGIN#### |
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10 // |
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11 // ------------------------------------------- |
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12 // The contents of this file are subject to the Cygnus eCos Public License |
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13 // Version 1.0 (the "License"); you may not use this file except in |
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14 // compliance with the License. You may obtain a copy of the License at |
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15 // http://sourceware.cygnus.com/ecos |
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16 // |
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17 // Software distributed under the License is distributed on an "AS IS" |
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18 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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19 // License for the specific language governing rights and limitations under |
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20 // the License. |
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21 // |
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22 // The Original Code is eCos - Embedded Cygnus Operating System, released |
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23 // September 30, 1998. |
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24 // |
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25 // The Initial Developer of the Original Code is Cygnus. Portions created |
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26 // by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. |
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27 // ------------------------------------------- |
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28 // |
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29 //####COPYRIGHTEND#### |
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30 //=========================================================================== |
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31 //#####DESCRIPTIONBEGIN#### |
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32 // |
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33 // Author(s): jlarmour |
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34 // Contributors: jlarmour@cygnus.co.uk |
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35 // Date: 1998-02-13 |
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36 // Purpose: |
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37 // Description: |
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38 // Usage: |
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39 // |
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40 //####DESCRIPTIONEND#### |
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41 // |
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42 //=========================================================================== |
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43 // |
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44 // This code is based on original code with the following copyright: |
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45 // |
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46 /* |
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47 * Copyright (c) 1990 Regents of the University of California. |
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48 * All rights reserved. |
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49 * |
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50 * Redistribution and use in source and binary forms, with or without |
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51 * modification, are permitted provided that the following conditions |
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52 * are met: |
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53 * 1. Redistributions of source code must retain the above copyright |
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54 * notice, this list of conditions and the following disclaimer. |
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55 * 2. Redistributions in binary form must reproduce the above copyright |
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56 * notice, this list of conditions and the following disclaimer in the |
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57 * documentation and/or other materials provided with the distribution. |
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58 * 3. All advertising materials mentioning features or use of this software |
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59 * must display the following acknowledgement: |
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60 * This product includes software developed by the University of |
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61 * California, Berkeley and its contributors. |
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62 * 4. Neither the name of the University nor the names of its contributors |
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63 * may be used to endorse or promote products derived from this software |
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64 * without specific prior written permission. |
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65 * |
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66 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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67 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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68 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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69 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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70 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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71 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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72 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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73 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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74 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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75 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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76 * SUCH DAMAGE. |
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77 */ |
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78 |
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79 |
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80 // CONFIGURATION |
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81 |
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82 #include <pkgconf/libc.h> // Configuration header |
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83 |
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84 // Include the C library? |
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85 #ifdef CYGPKG_LIBC |
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86 |
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87 // INCLUDES |
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88 |
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89 #include <cyg/infra/cyg_type.h> // Common type definitions and support |
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90 #include <cyg/infra/cyg_trac.h> // Tracing support |
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91 #include <cyg/infra/cyg_ass.h> // Assertion support |
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92 #include <limits.h> // Definition of ULONG_MAX |
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93 #include <ctype.h> // Definition of many ctype functions |
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94 #include <errno.h> // Error code definitions |
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95 #include <stdlib.h> // Header for all stdlib functions |
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96 // (like this one) |
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97 #include "clibincl/stdlibsupp.hxx" // Support for stdlib functions |
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98 |
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99 |
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100 // EXPORTED SYMBOLS |
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101 |
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102 externC unsigned long |
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103 strtoul( const char *nptr, char **endptr, int base ) \ |
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104 CYGPRI_LIBC_WEAK_ALIAS("_strtoul"); |
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105 |
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106 // FUNCTIONS |
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107 |
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108 // |
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109 // Convert a string to an unsigned long integer. |
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110 // |
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111 // Ignores `locale' stuff. Assumes that the upper and lower case |
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112 // alphabets and digits are each contiguous. |
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113 // |
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114 |
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115 unsigned long |
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116 _strtoul( const char *nptr, char **endptr, int base ) |
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117 { |
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118 const char *s = nptr; |
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119 unsigned long acc; |
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120 int c; |
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121 unsigned long cutoff; |
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122 int neg = 0, any, cutlim; |
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123 |
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124 CYG_REPORT_FUNCNAMETYPE( "_strtoul", "returning long %d" ); |
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125 CYG_REPORT_FUNCARG3( "nptr=%08x, endptr=%08x, base=%d", |
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126 nptr, endptr, base ); |
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127 CYG_CHECK_DATA_PTR( nptr, "nptr is not a valid pointer!" ); |
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128 |
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129 if (endptr != NULL) |
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130 CYG_CHECK_DATA_PTR( endptr, "endptr is not a valid pointer!" ); |
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131 // |
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132 // See strtol for comments as to the logic used. |
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133 // |
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134 do { |
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135 c = *s++; |
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136 } while (isspace(c)); |
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137 if (c == '-') { |
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138 neg = 1; |
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139 c = *s++; |
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140 } else if (c == '+') |
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141 c = *s++; |
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142 if ((base == 0 || base == 16) && |
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143 c == '0' && (*s == 'x' || *s == 'X')) { |
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144 c = s[1]; |
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145 s += 2; |
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146 base = 16; |
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147 } |
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148 if (base == 0) |
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149 base = c == '0' ? 8 : 10; |
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150 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; |
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151 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; |
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152 for (acc = 0, any = 0;; c = *s++) { |
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153 if (isdigit(c)) |
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154 c -= '0'; |
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155 else if (isalpha(c)) |
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156 c -= isupper(c) ? 'A' - 10 : 'a' - 10; |
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157 else |
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158 break; |
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159 if (c >= base) |
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160 break; |
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161 if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim) |
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162 any = -1; |
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163 else { |
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164 any = 1; |
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165 acc *= base; |
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166 acc += c; |
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167 } |
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168 } |
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169 if (any < 0) { |
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170 acc = ULONG_MAX; |
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171 errno = ERANGE; |
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172 } else if (neg) |
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173 acc = -acc; |
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174 if (endptr != 0) |
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175 *endptr = (char *) (any ? s - 1 : nptr); |
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176 |
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177 CYG_REPORT_RETVAL( acc ); |
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178 |
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179 return acc; |
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180 } // _strtoul() |
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181 |
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182 #endif // ifdef CYGPKG_LIBC |
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183 |
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184 // EOF strtoul.cxx |
