1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * Utility routines.
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4 | *
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5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | #include "libbb.h"
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11 |
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12 | /* On exit: errno = 0 only if there was non-empty, '\0' terminated value
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13 | * errno = EINVAL if value was not '\0' terminated, but otherwise ok
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14 | * Return value is still valid, caller should just check whether end[0]
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15 | * is a valid terminating char for particular case. OTOH, if caller
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16 | * requires '\0' terminated input, [s]he can just check errno == 0.
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17 | * errno = ERANGE if value had alphanumeric terminating char ("1234abcg").
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18 | * errno = ERANGE if value is out of range, missing, etc.
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19 | * errno = ERANGE if value had minus sign for strtouXX (even "-0" is not ok )
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20 | * return value is all-ones in this case.
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21 | *
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22 | * Test code:
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23 | * char *endptr;
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24 | * const char *minus = "-";
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25 | * errno = 0;
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26 | * bb_strtoi(minus, &endptr, 0); // must set ERANGE
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27 | * printf("minus:%p endptr:%p errno:%d EINVAL:%d\n", minus, endptr, errno, EINVAL);
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28 | * errno = 0;
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29 | * bb_strtoi("-0-", &endptr, 0); // must set EINVAL and point to second '-'
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30 | * printf("endptr[0]:%c errno:%d EINVAL:%d\n", endptr[0], errno, EINVAL);
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31 | */
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32 |
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33 | static unsigned long long ret_ERANGE(void)
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34 | {
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35 | errno = ERANGE; /* this ain't as small as it looks (on glibc) */
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36 | return ULLONG_MAX;
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37 | }
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38 |
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39 | static unsigned long long handle_errors(unsigned long long v, char **endp)
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40 | {
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41 | char next_ch = **endp;
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42 |
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43 | /* errno is already set to ERANGE by strtoXXX if value overflowed */
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44 | if (next_ch) {
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45 | /* "1234abcg" or out-of-range? */
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46 | if (isalnum(next_ch) || errno)
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47 | return ret_ERANGE();
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48 | /* good number, just suspicious terminator */
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49 | errno = EINVAL;
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50 | }
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51 | return v;
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52 | }
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53 |
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54 |
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55 | unsigned long long FAST_FUNC bb_strtoull(const char *arg, char **endp, int base)
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56 | {
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57 | unsigned long long v;
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58 | char *endptr;
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59 |
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60 | if (!endp) endp = &endptr;
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61 | *endp = (char*) arg;
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62 |
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63 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */
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64 | /* I don't think that this is right. Preventing this... */
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65 | if (!isalnum(arg[0])) return ret_ERANGE();
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66 |
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67 | /* not 100% correct for lib func, but convenient for the caller */
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68 | errno = 0;
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69 | v = strtoull(arg, endp, base);
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70 | return handle_errors(v, endp);
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71 | }
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72 |
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73 | long long FAST_FUNC bb_strtoll(const char *arg, char **endp, int base)
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74 | {
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75 | unsigned long long v;
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76 | char *endptr;
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77 | char first;
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78 |
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79 | if (!endp) endp = &endptr;
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80 | *endp = (char*) arg;
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81 |
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82 | /* Check for the weird "feature":
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83 | * a "-" string is apparently a valid "number" for strto[u]l[l]!
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84 | * It returns zero and errno is 0! :( */
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85 | first = (arg[0] != '-' ? arg[0] : arg[1]);
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86 | if (!isalnum(first)) return ret_ERANGE();
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87 |
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88 | errno = 0;
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89 | v = strtoll(arg, endp, base);
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90 | return handle_errors(v, endp);
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91 | }
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92 |
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93 | #if ULONG_MAX != ULLONG_MAX
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94 | unsigned long FAST_FUNC bb_strtoul(const char *arg, char **endp, int base)
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95 | {
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96 | unsigned long v;
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97 | char *endptr;
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98 |
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99 | if (!endp) endp = &endptr;
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100 | *endp = (char*) arg;
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101 |
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102 | if (!isalnum(arg[0])) return ret_ERANGE();
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103 | errno = 0;
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104 | v = strtoul(arg, endp, base);
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105 | return handle_errors(v, endp);
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106 | }
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107 |
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108 | long FAST_FUNC bb_strtol(const char *arg, char **endp, int base)
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109 | {
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110 | long v;
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111 | char *endptr;
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112 | char first;
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113 |
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114 | if (!endp) endp = &endptr;
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115 | *endp = (char*) arg;
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116 |
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117 | first = (arg[0] != '-' ? arg[0] : arg[1]);
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118 | if (!isalnum(first)) return ret_ERANGE();
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119 |
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120 | errno = 0;
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121 | v = strtol(arg, endp, base);
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122 | return handle_errors(v, endp);
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123 | }
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124 | #endif
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125 |
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126 | #if UINT_MAX != ULONG_MAX
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127 | unsigned FAST_FUNC bb_strtou(const char *arg, char **endp, int base)
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128 | {
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129 | unsigned long v;
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130 | char *endptr;
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131 |
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132 | if (!endp) endp = &endptr;
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133 | *endp = (char*) arg;
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134 |
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135 | if (!isalnum(arg[0])) return ret_ERANGE();
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136 | errno = 0;
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137 | v = strtoul(arg, endp, base);
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138 | if (v > UINT_MAX) return ret_ERANGE();
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139 | return handle_errors(v, endp);
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140 | }
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141 |
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142 | int FAST_FUNC bb_strtoi(const char *arg, char **endp, int base)
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143 | {
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144 | long v;
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145 | char *endptr;
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146 | char first;
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147 |
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148 | if (!endp) endp = &endptr;
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149 | *endp = (char*) arg;
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150 |
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151 | first = (arg[0] != '-' ? arg[0] : arg[1]);
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152 | if (!isalnum(first)) return ret_ERANGE();
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153 |
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154 | errno = 0;
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155 | v = strtol(arg, endp, base);
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156 | if (v > INT_MAX) return ret_ERANGE();
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157 | if (v < INT_MIN) return ret_ERANGE();
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158 | return handle_errors(v, endp);
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159 | }
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160 | #endif
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