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1 /* Copyright (C) 1991, 1992 Free Software Foundation, Inc. |
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2 |
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3 This program is free software; you can redistribute it and/or modify |
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4 it under the terms of the GNU General Public License as published by |
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5 the Free Software Foundation; either version 2, or (at your option) |
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6 any later version. |
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7 |
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8 This program is distributed in the hope that it will be useful, |
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9 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 GNU General Public License for more details. |
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12 |
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13 You should have received a copy of the GNU General Public License |
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14 along with this program; if not, write to the Free Software |
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15 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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16 |
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17 #ifdef HAVE_CONFIG_H |
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18 #include <config.h> |
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19 #endif |
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20 |
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21 #include <ctype.h> |
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22 #include <errno.h> |
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23 #ifndef errno |
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24 extern int errno; |
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25 #endif |
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26 |
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27 #if HAVE_LIMITS_H |
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28 #include <limits.h> |
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29 #endif |
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30 |
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31 #ifndef ULONG_MAX |
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32 #define ULONG_MAX ((unsigned long) ~(unsigned long) 0) |
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33 #endif |
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34 |
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35 #ifndef LONG_MAX |
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36 #define LONG_MAX (~(1 << (sizeof (long) * 8 - 1))) |
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376
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37 #endif |
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38 |
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39 #ifndef LONG_MIN |
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40 #define LONG_MIN (-LONG_MAX - 1) |
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41 #endif |
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42 |
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43 #if STDC_HEADERS |
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44 #include <stddef.h> |
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45 #include <stdlib.h> |
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46 #else |
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47 #define NULL 0 |
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48 #endif |
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49 |
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50 #ifndef UNSIGNED |
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51 #define UNSIGNED 0 |
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52 #endif |
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53 |
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54 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE. |
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55 If BASE is 0 the base is determined by the presence of a leading |
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56 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal. |
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57 If BASE is < 2 or > 36, it is reset to 10. |
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58 If ENDPTR is not NULL, a pointer to the character after the last |
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59 one converted is stored in *ENDPTR. */ |
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60 #if UNSIGNED |
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61 unsigned long int |
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62 #define strtol strtoul |
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63 #else |
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64 long int |
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65 #endif |
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66 strtol (nptr, endptr, base) |
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67 const char *nptr; |
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68 char **endptr; |
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69 int base; |
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70 { |
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71 int negative; |
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72 register unsigned long int cutoff; |
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73 register unsigned int cutlim; |
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74 register unsigned long int i; |
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75 register const char *s; |
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76 register unsigned char c; |
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77 const char *save; |
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78 int overflow; |
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79 |
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80 if (base < 0 || base == 1 || base > 36) |
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81 base = 10; |
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82 |
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83 s = nptr; |
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84 |
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85 /* Skip white space. */ |
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86 while (isspace (*s)) |
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87 ++s; |
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88 if (*s == '\0') |
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89 goto noconv; |
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90 |
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91 /* Check for a sign. */ |
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92 if (*s == '-') |
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93 { |
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94 negative = 1; |
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95 ++s; |
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96 } |
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97 else if (*s == '+') |
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98 { |
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99 negative = 0; |
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100 ++s; |
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101 } |
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102 else |
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103 negative = 0; |
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104 |
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105 if (base == 16 && s[0] == '0' && toupper (s[1]) == 'X') |
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106 s += 2; |
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107 |
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108 /* If BASE is zero, figure it out ourselves. */ |
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109 if (base == 0) |
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110 { |
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111 if (*s == '0') |
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112 { |
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113 if (toupper (s[1]) == 'X') |
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114 { |
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115 s += 2; |
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116 base = 16; |
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117 } |
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118 else |
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119 base = 8; |
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120 } |
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121 else |
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122 base = 10; |
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123 } |
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124 |
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125 /* Save the pointer so we can check later if anything happened. */ |
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126 save = s; |
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127 |
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128 cutoff = ULONG_MAX / (unsigned long int) base; |
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129 cutlim = ULONG_MAX % (unsigned long int) base; |
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130 |
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131 overflow = 0; |
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132 i = 0; |
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133 for (c = *s; c != '\0'; c = *++s) |
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134 { |
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135 if (isdigit (c)) |
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136 c -= '0'; |
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137 else if (isalpha (c)) |
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138 c = toupper (c) - 'A' + 10; |
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139 else |
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140 break; |
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141 if (c >= base) |
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142 break; |
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143 /* Check for overflow. */ |
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144 if (i > cutoff || (i == cutoff && c > cutlim)) |
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145 overflow = 1; |
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146 else |
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147 { |
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148 i *= (unsigned long int) base; |
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149 i += c; |
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150 } |
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151 } |
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152 |
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153 /* Check if anything actually happened. */ |
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154 if (s == save) |
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155 goto noconv; |
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156 |
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157 /* Store in ENDPTR the address of one character |
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158 past the last character we converted. */ |
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159 if (endptr != NULL) |
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160 *endptr = (char *) s; |
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161 |
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162 #if !UNSIGNED |
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163 /* Check for a value that is within the range of |
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164 `unsigned long int', but outside the range of `long int'. */ |
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165 if (i > (negative ? |
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166 -(unsigned long int) LONG_MIN : (unsigned long int) LONG_MAX)) |
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167 overflow = 1; |
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168 #endif |
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169 |
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170 if (overflow) |
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171 { |
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172 errno = ERANGE; |
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173 #if UNSIGNED |
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174 return ULONG_MAX; |
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175 #else |
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176 return negative ? LONG_MIN : LONG_MAX; |
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177 #endif |
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178 } |
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179 |
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180 /* Return the result of the appropriate sign. */ |
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181 return (negative ? -i : i); |
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182 |
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183 noconv:; |
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184 /* There was no number to convert. */ |
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185 if (endptr != NULL) |
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186 *endptr = (char *) nptr; |
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187 return 0L; |
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188 } |
