Mercurial > flash_v2

annotate packages/language/c/libc/stdlib/current/src/strtol.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 // strtol.cxx
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4 //
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5 // ISO standard string to long int conversion function defined in
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6 // section 7.10.1.5 of the standard
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7 //
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8 //===========================================================================
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9 //####ECOSGPLCOPYRIGHTBEGIN####
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10 // -------------------------------------------
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11 // This file is part of eCos, the Embedded Configurable Operating System.
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12 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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13 //
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14 // eCos is free software; you can redistribute it and/or modify it under
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15 // the terms of the GNU General Public License as published by the Free
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16 // Software Foundation; either version 2 or (at your option) any later version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License along
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24 // with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use macros
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28 // or inline functions from this file, or you compile this file and link it
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29 // with other works to produce a work based on this file, this file does not
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30 // by itself cause the resulting work to be covered by the GNU General Public
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31 // License. However the source code for this file must still be made available
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32 // in accordance with section (3) of the GNU General Public License.
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33 //
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34 // This exception does not invalidate any other reasons why a work based on
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35 // this file might be covered by the GNU General Public License.
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36 //
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37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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38 // at http://sources.redhat.com/ecos/ecos-license/
208
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39 // -------------------------------------------
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40 //####ECOSGPLCOPYRIGHTEND####
115
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41 //===========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): jlarmour
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45 // Contributors:
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46 // Date: 2000-04-30
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47 // Purpose:
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48 // Description:
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49 // Usage:
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //===========================================================================
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54 //
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55 // This code is based on original code with the following copyright:
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56 //
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57 /*-
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58 * Copyright (c) 1990 The Regents of the University of California.
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59 * All rights reserved.
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60 *
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61 * Redistribution and use in source and binary forms, with or without
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62 * modification, are permitted provided that the following conditions
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63 * are met:
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64 * 1. Redistributions of source code must retain the above copyright
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65 * notice, this list of conditions and the following disclaimer.
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66 * 2. Redistributions in binary form must reproduce the above copyright
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67 * notice, this list of conditions and the following disclaimer in the
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68 * documentation and/or other materials provided with the distribution.
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69 * 3. Neither the name of the University nor the names of its contributors
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70 * may be used to endorse or promote products derived from this software
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71 * without specific prior written permission.
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72 *
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73 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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74 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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75 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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76 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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77 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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78 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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79 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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80 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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81 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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82 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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83 * SUCH DAMAGE.
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84 */
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85
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86
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87 // CONFIGURATION
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88
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89 #include <pkgconf/libc_stdlib.h> // Configuration header
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90
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91 // INCLUDES
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92
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93 #include <cyg/infra/cyg_type.h> // Common type definitions and support
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94 #include <cyg/infra/cyg_trac.h> // Tracing support
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95 #include <cyg/infra/cyg_ass.h> // Assertion support
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96 #include <limits.h> // Definition of LONG_MIN and LONG_MAX
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97 #include <ctype.h> // Definition of many ctype functions
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98 #include <errno.h> // Error code definitions
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99 #include <stdlib.h> // Header for all stdlib functions
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100 // (like this one)
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101
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102
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103 // FUNCTIONS
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104
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105 //
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106 // Convert a string to a long integer.
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107 //
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108 // Ignores `locale' stuff. Assumes that the upper and lower case
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109 // alphabets and digits are each contiguous.
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110 //
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111
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112 long
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113 strtol( const char *nptr, char **endptr, int base )
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114 {
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115 const char *s = nptr;
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116 unsigned long acc;
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117 int c;
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118 unsigned long cutoff;
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119 int neg = 0, any, cutlim;
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120
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121 CYG_REPORT_FUNCNAMETYPE( "strtol", "returning long %d" );
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122 CYG_REPORT_FUNCARG3( "nptr=%08x, endptr=%08x, base=%d",
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123 nptr, endptr, base );
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124 CYG_CHECK_DATA_PTR( nptr, "nptr is not a valid pointer!" );
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125
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126 if (endptr != NULL)
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127 CYG_CHECK_DATA_PTR( endptr, "endptr is not a valid pointer!" );
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128
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129 //
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130 // Skip white space and pick up leading +/- sign if any.
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131 // If base is 0, allow 0x for hex and 0 for octal, else
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132 // assume decimal; if base is already 16, allow 0x.
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133 //
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134
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135 do {
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136 c = *s++;
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137 } while (isspace(c));
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138 if (c == '-') {
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139 neg = 1;
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140 c = *s++;
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141 } else if (c == '+')
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142 c = *s++;
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143 if ((base == 0 || base == 16) &&
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144 c == '0' && (*s == 'x' || *s == 'X')) {
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145 c = s[1];
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146 s += 2;
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147 base = 16;
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148 }
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149 if (base == 0)
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150 base = c == '0' ? 8 : 10;
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151
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152 //
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153 // Compute the cutoff value between legal numbers and illegal
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154 // numbers. That is the largest legal value, divided by the
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155 // base. An input number that is greater than this value, if
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156 // followed by a legal input character, is too big. One that
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157 // is equal to this value may be valid or not; the limit
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158 // between valid and invalid numbers is then based on the last
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159 // digit. For instance, if the range for longs is
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160 // [-2147483648..2147483647] and the input base is 10,
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161 // cutoff will be set to 214748364 and cutlim to either
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162 // 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
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163 // a value > 214748364, or equal but the next digit is > 7 (or 8),
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164 // the number is too big, and we will return a range error.
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165 //
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166 // Set any if any `digits' consumed; make it negative to indicate
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167 // overflow.
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168 //
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169
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170 cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
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171 cutlim = cutoff % (unsigned long)base;
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172 cutoff /= (unsigned long)base;
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173 for (acc = 0, any = 0;; c = *s++) {
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174 if (isdigit(c))
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175 c -= '0';
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176 else if (isalpha(c))
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177 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
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178 else
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179 break;
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180 if (c >= base)
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181 break;
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182 if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim)
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183 any = -1;
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184 else {
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185 any = 1;
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186 acc *= base;
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187 acc += c;
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188 }
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189 }
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190 if (any < 0) {
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191 acc = neg ? LONG_MIN : LONG_MAX;
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192 errno = ERANGE;
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193 } else if (neg)
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194 acc = -acc;
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195 if (endptr != 0)
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196 *endptr = (char *) (any ? s - 1 : nptr);
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197
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198 CYG_REPORT_RETVAL ( acc );
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199
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200 return acc;
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201 } // strtol()
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202
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203 // EOF strtol.cxx