1 | /***************************************************************************
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2 | * _ _ ____ _
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3 | * Project ___| | | | _ \| |
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4 | * / __| | | | |_) | |
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5 | * | (__| |_| | _ <| |___
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6 | * \___|\___/|_| \_\_____|
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7 | *
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8 | * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 | *
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10 | * This software is licensed as described in the file COPYING, which
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11 | * you should have received as part of this distribution. The terms
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12 | * are also available at https://curl.haxx.se/docs/copyright.html.
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13 | *
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14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 | * copies of the Software, and permit persons to whom the Software is
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16 | * furnished to do so, under the terms of the COPYING file.
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17 | *
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18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 | * KIND, either express or implied.
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20 | *
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21 | ***************************************************************************/
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22 |
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23 | #include "curl_setup.h"
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24 |
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25 | #include "strtoofft.h"
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26 |
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27 | /*
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28 | * NOTE:
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29 | *
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30 | * In the ISO C standard (IEEE Std 1003.1), there is a strtoimax() function we
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31 | * could use in case strtoll() doesn't exist... See
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32 | * http://www.opengroup.org/onlinepubs/009695399/functions/strtoimax.html
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33 | */
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34 |
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35 | #ifdef NEED_CURL_STRTOLL
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36 |
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37 | /* Range tests can be used for alphanum decoding if characters are consecutive,
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38 | like in ASCII. Else an array is scanned. Determine this condition now. */
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39 |
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40 | #if('9' - '0') != 9 || ('Z' - 'A') != 25 || ('z' - 'a') != 25
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41 |
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42 | #define NO_RANGE_TEST
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43 |
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44 | static const char valchars[] =
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45 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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46 | #endif
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47 |
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48 | static int get_char(char c, int base);
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49 |
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50 | /**
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51 | * Emulated version of the strtoll function. This extracts a long long
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52 | * value from the given input string and returns it.
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53 | */
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54 | curl_off_t
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55 | curlx_strtoll(const char *nptr, char **endptr, int base)
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56 | {
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57 | char *end;
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58 | int is_negative = 0;
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59 | int overflow;
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60 | int i;
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61 | curl_off_t value = 0;
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62 | curl_off_t newval;
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63 |
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64 | /* Skip leading whitespace. */
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65 | end = (char *)nptr;
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66 | while(ISSPACE(end[0])) {
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67 | end++;
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68 | }
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69 |
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70 | /* Handle the sign, if any. */
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71 | if(end[0] == '-') {
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72 | is_negative = 1;
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73 | end++;
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74 | }
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75 | else if(end[0] == '+') {
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76 | end++;
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77 | }
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78 | else if(end[0] == '\0') {
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79 | /* We had nothing but perhaps some whitespace -- there was no number. */
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80 | if(endptr) {
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81 | *endptr = end;
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82 | }
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83 | return 0;
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84 | }
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85 |
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86 | /* Handle special beginnings, if present and allowed. */
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87 | if(end[0] == '0' && end[1] == 'x') {
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88 | if(base == 16 || base == 0) {
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89 | end += 2;
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90 | base = 16;
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91 | }
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92 | }
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93 | else if(end[0] == '0') {
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94 | if(base == 8 || base == 0) {
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95 | end++;
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96 | base = 8;
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97 | }
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98 | }
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99 |
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100 | /* Matching strtol, if the base is 0 and it doesn't look like
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101 | * the number is octal or hex, we assume it's base 10.
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102 | */
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103 | if(base == 0) {
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104 | base = 10;
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105 | }
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106 |
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107 | /* Loop handling digits. */
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108 | value = 0;
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109 | overflow = 0;
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110 | for(i = get_char(end[0], base);
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111 | i != -1;
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112 | end++, i = get_char(end[0], base)) {
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113 | newval = base * value + i;
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114 | if(newval < value) {
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115 | /* We've overflowed. */
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116 | overflow = 1;
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117 | break;
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118 | }
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119 | else
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120 | value = newval;
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121 | }
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122 |
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123 | if(!overflow) {
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124 | if(is_negative) {
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125 | /* Fix the sign. */
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126 | value *= -1;
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127 | }
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128 | }
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129 | else {
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130 | if(is_negative)
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131 | value = CURL_OFF_T_MIN;
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132 | else
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133 | value = CURL_OFF_T_MAX;
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134 |
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135 | SET_ERRNO(ERANGE);
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136 | }
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137 |
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138 | if(endptr)
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139 | *endptr = end;
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140 |
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141 | return value;
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142 | }
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143 |
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144 | /**
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145 | * Returns the value of c in the given base, or -1 if c cannot
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146 | * be interpreted properly in that base (i.e., is out of range,
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147 | * is a null, etc.).
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148 | *
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149 | * @param c the character to interpret according to base
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150 | * @param base the base in which to interpret c
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151 | *
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152 | * @return the value of c in base, or -1 if c isn't in range
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153 | */
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154 | static int get_char(char c, int base)
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155 | {
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156 | #ifndef NO_RANGE_TEST
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157 | int value = -1;
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158 | if(c <= '9' && c >= '0') {
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159 | value = c - '0';
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160 | }
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161 | else if(c <= 'Z' && c >= 'A') {
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162 | value = c - 'A' + 10;
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163 | }
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164 | else if(c <= 'z' && c >= 'a') {
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165 | value = c - 'a' + 10;
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166 | }
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167 | #else
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168 | const char * cp;
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169 | int value;
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170 |
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171 | cp = memchr(valchars, c, 10 + 26 + 26);
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172 |
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173 | if(!cp)
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174 | return -1;
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175 |
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176 | value = cp - valchars;
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177 |
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178 | if(value >= 10 + 26)
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179 | value -= 26; /* Lowercase. */
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180 | #endif
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181 |
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182 | if(value >= base) {
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183 | value = -1;
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184 | }
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185 |
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186 | return value;
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187 | }
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188 | #endif /* Only present if we need strtoll, but don't have it. */
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