1 | /* |
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2 | FUNCTION |
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3 | <<strtoull>>, <<strtoull_l>>---string to unsigned long long |
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4 | |
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5 | INDEX |
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6 | strtoull |
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7 | |
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8 | INDEX |
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9 | strtoull_l |
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10 | |
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11 | SYNOPSIS |
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12 | #include <stdlib.h> |
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13 | unsigned long long strtoull(const char *restrict <[s]>, |
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14 | char **restrict <[ptr]>, int <[base]>); |
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15 | |
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16 | #include <stdlib.h> |
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17 | unsigned long long strtoull_l(const char *restrict <[s]>, |
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18 | char **restrict <[ptr]>, int <[base]>, |
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19 | locale_t <[locale]>); |
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20 | |
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21 | unsigned long long _strtoull_r(void *<[reent]>, |
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22 | const char *restrict <[s]>, |
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23 | char **restrict <[ptr]>, int <[base]>); |
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24 | |
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25 | DESCRIPTION |
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26 | The function <<strtoull>> converts the string <<*<[s]>>> to |
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27 | an <<unsigned long long>>. First, it breaks down the string into three parts: |
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28 | leading whitespace, which is ignored; a subject string consisting |
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29 | of the digits meaningful in the radix specified by <[base]> |
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30 | (for example, <<0>> through <<7>> if the value of <[base]> is 8); |
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31 | and a trailing portion consisting of one or more unparseable characters, |
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32 | which always includes the terminating null character. Then, it attempts |
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33 | to convert the subject string into an unsigned long long integer, and returns the |
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34 | result. |
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35 | |
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36 | If the value of <[base]> is zero, the subject string is expected to look |
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37 | like a normal C integer constant (save that no optional sign is permitted): |
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38 | a possible <<0x>> indicating hexadecimal radix, and a number. |
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39 | If <[base]> is between 2 and 36, the expected form of the subject is a |
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40 | sequence of digits (which may include letters, depending on the |
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41 | base) representing an integer in the radix specified by <[base]>. |
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42 | The letters <<a>>--<<z>> (or <<A>>--<<Z>>) are used as digits valued from |
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43 | 10 to 35. If <[base]> is 16, a leading <<0x>> is permitted. |
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44 | |
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45 | The subject sequence is the longest initial sequence of the input |
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46 | string that has the expected form, starting with the first |
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47 | non-whitespace character. If the string is empty or consists entirely |
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48 | of whitespace, or if the first non-whitespace character is not a |
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49 | permissible digit, the subject string is empty. |
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50 | |
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51 | If the subject string is acceptable, and the value of <[base]> is zero, |
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52 | <<strtoull>> attempts to determine the radix from the input string. A |
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53 | string with a leading <<0x>> is treated as a hexadecimal value; a string with |
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54 | a leading <<0>> and no <<x>> is treated as octal; all other strings are |
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55 | treated as decimal. If <[base]> is between 2 and 36, it is used as the |
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56 | conversion radix, as described above. Finally, a pointer to the first |
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57 | character past the converted subject string is stored in <[ptr]>, if |
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58 | <[ptr]> is not <<NULL>>. |
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59 | |
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60 | If the subject string is empty (that is, if <<*>><[s]> does not start |
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61 | with a substring in acceptable form), no conversion |
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62 | is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is |
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63 | not <<NULL>>). |
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64 | |
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65 | <<strtoull_l>> is like <<strtoull>> but performs the conversion based on the |
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66 | locale specified by the locale object locale. If <[locale]> is |
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67 | LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined. |
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68 | |
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69 | The alternate function <<_strtoull_r>> is a reentrant version. The |
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70 | extra argument <[reent]> is a pointer to a reentrancy structure. |
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71 | |
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72 | RETURNS |
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73 | <<strtoull>>, <<strtoull_l>> return the converted value, if any. If no |
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74 | conversion was made, <<0>> is returned. |
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75 | |
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76 | <<strtoull>>, <<strtoull_l>> return <<ULONG_LONG_MAX>> if the magnitude |
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77 | of the converted value is too large, and sets <<errno>> to <<ERANGE>>. |
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78 | |
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79 | PORTABILITY |
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80 | <<strtoull>> is ANSI. |
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81 | <<strtoull_l>> is a GNU extension. |
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82 | |
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83 | <<strtoull>> requires no supporting OS subroutines. |
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84 | */ |
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85 | |
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86 | /* |
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87 | * Copyright (c) 1990 Regents of the University of California. |
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88 | * All rights reserved. |
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89 | * |
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90 | * Redistribution and use in source and binary forms, with or without |
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91 | * modification, are permitted provided that the following conditions |
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92 | * are met: |
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93 | * 1. Redistributions of source code must retain the above copyright |
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94 | * notice, this list of conditions and the following disclaimer. |
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95 | * 2. Redistributions in binary form must reproduce the above copyright |
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96 | * notice, this list of conditions and the following disclaimer in the |
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97 | * documentation and/or other materials provided with the distribution. |
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98 | * 3. All advertising materials mentioning features or use of this software |
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99 | * must display the following acknowledgement: |
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100 | * This product includes software developed by the University of |
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101 | * California, Berkeley and its contributors. |
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102 | * 4. Neither the name of the University nor the names of its contributors |
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103 | * may be used to endorse or promote products derived from this software |
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104 | * without specific prior written permission. |
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105 | * |
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106 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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107 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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108 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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109 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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110 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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111 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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112 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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113 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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114 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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115 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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116 | * SUCH DAMAGE. |
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117 | */ |
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118 | |
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119 | #define _GNU_SOURCE |
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120 | #include <_ansi.h> |
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121 | #include <limits.h> |
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122 | #include <ctype.h> |
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123 | #include <errno.h> |
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124 | #include <stdlib.h> |
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125 | #include <reent.h> |
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126 | #include "../locale/setlocale.h" |
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127 | |
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128 | /* |
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129 | * Convert a string to an unsigned long long integer. |
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130 | */ |
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131 | static unsigned long long |
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132 | _strtoull_l (struct _reent *rptr, const char *__restrict nptr, |
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133 | char **__restrict endptr, int base, locale_t loc) |
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134 | { |
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135 | register const unsigned char *s = (const unsigned char *)nptr; |
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136 | register unsigned long long acc; |
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137 | register int c; |
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138 | register unsigned long long cutoff; |
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139 | register int neg = 0, any, cutlim; |
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140 | |
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141 | /* |
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142 | * See strtol for comments as to the logic used. |
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143 | */ |
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144 | do { |
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145 | c = *s++; |
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146 | } while (isspace_l(c, loc)); |
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147 | if (c == '-') { |
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148 | neg = 1; |
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149 | c = *s++; |
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150 | } else if (c == '+') |
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151 | c = *s++; |
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152 | if ((base == 0 || base == 16) && |
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153 | c == '0' && (*s == 'x' || *s == 'X')) { |
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154 | c = s[1]; |
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155 | s += 2; |
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156 | base = 16; |
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157 | } |
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158 | if (base == 0) |
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159 | base = c == '0' ? 8 : 10; |
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160 | cutoff = (unsigned long long)ULONG_LONG_MAX / (unsigned long long)base; |
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161 | cutlim = (unsigned long long)ULONG_LONG_MAX % (unsigned long long)base; |
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162 | for (acc = 0, any = 0;; c = *s++) { |
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163 | if (c >= '0' && c <= '9') |
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164 | c -= '0'; |
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165 | else if (c >= 'A' && c <= 'Z') |
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166 | c -= 'A' - 10; |
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167 | else if (c >= 'a' && c <= 'z') |
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168 | c -= 'a' - 10; |
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169 | else |
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170 | break; |
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171 | if (c >= base) |
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172 | break; |
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173 | if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) |
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174 | any = -1; |
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175 | else { |
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176 | any = 1; |
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177 | acc *= base; |
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178 | acc += c; |
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179 | } |
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180 | } |
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181 | if (any < 0) { |
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182 | acc = ULONG_LONG_MAX; |
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183 | rptr->_errno = ERANGE; |
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184 | } else if (neg) |
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185 | acc = -acc; |
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186 | if (endptr != 0) |
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187 | *endptr = (char *) (any ? (char *)s - 1 : nptr); |
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188 | return (acc); |
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189 | } |
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190 | |
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191 | unsigned long long |
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192 | _strtoull_r (struct _reent *rptr, |
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193 | const char *__restrict nptr, |
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194 | char **__restrict endptr, |
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195 | int base) |
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196 | { |
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197 | return _strtoull_l (rptr, nptr, endptr, base, __get_current_locale ()); |
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198 | } |
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199 | |
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200 | #ifndef _REENT_ONLY |
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201 | |
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202 | unsigned long long |
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203 | strtoull_l (const char *__restrict s, char **__restrict ptr, int base, |
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204 | locale_t loc) |
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205 | { |
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206 | return _strtoull_l (_REENT, s, ptr, base, loc); |
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207 | } |
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208 | |
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209 | unsigned long long |
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210 | strtoull (const char *__restrict s, |
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211 | char **__restrict ptr, |
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212 | int base) |
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213 | { |
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214 | return _strtoull_l (_REENT, s, ptr, base, __get_current_locale ()); |
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215 | } |
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216 | |
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217 | #endif |
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