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 tarball for details. |
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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 othervise 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 | |
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23 | static unsigned long long ret_ERANGE(void) |
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24 | { |
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25 | errno = ERANGE; /* this ain't as small as it looks (on glibc) */ |
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26 | return ULLONG_MAX; |
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27 | } |
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28 | |
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29 | static unsigned long long handle_errors(unsigned long long v, char **endp, char *endptr) |
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30 | { |
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31 | if (endp) *endp = endptr; |
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32 | |
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33 | /* Check for the weird "feature": |
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34 | * a "-" string is apparently a valid "number" for strto[u]l[l]! |
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35 | * It returns zero and errno is 0! :( */ |
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36 | if (endptr[-1] == '-') |
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37 | return ret_ERANGE(); |
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38 | |
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39 | /* errno is already set to ERANGE by strtoXXX if value overflowed */ |
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40 | if (endptr[0]) { |
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41 | /* "1234abcg" or out-of-range? */ |
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42 | if (isalnum(endptr[0]) || errno) |
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43 | return ret_ERANGE(); |
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44 | /* good number, just suspicious terminator */ |
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45 | errno = EINVAL; |
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46 | } |
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47 | return v; |
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48 | } |
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49 | |
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50 | |
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51 | unsigned long long bb_strtoull(const char *arg, char **endp, int base) |
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52 | { |
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53 | unsigned long long v; |
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54 | char *endptr; |
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55 | |
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56 | /* strtoul(" -4200000000") returns 94967296, errno 0 (!) */ |
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57 | /* I don't think that this is right. Preventing this... */ |
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58 | if (!isalnum(arg[0])) return ret_ERANGE(); |
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59 | |
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60 | /* not 100% correct for lib func, but convenient for the caller */ |
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61 | errno = 0; |
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62 | v = strtoull(arg, &endptr, base); |
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63 | return handle_errors(v, endp, endptr); |
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64 | } |
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65 | |
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66 | long long bb_strtoll(const char *arg, char **endp, int base) |
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67 | { |
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68 | unsigned long long v; |
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69 | char *endptr; |
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70 | |
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71 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
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72 | errno = 0; |
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73 | v = strtoll(arg, &endptr, base); |
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74 | return handle_errors(v, endp, endptr); |
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75 | } |
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76 | |
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77 | #if ULONG_MAX != ULLONG_MAX |
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78 | unsigned long bb_strtoul(const char *arg, char **endp, int base) |
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79 | { |
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80 | unsigned long v; |
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81 | char *endptr; |
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82 | |
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83 | if (!isalnum(arg[0])) return ret_ERANGE(); |
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84 | errno = 0; |
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85 | v = strtoul(arg, &endptr, base); |
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86 | return handle_errors(v, endp, endptr); |
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87 | } |
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88 | |
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89 | long bb_strtol(const char *arg, char **endp, int base) |
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90 | { |
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91 | long v; |
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92 | char *endptr; |
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93 | |
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94 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
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95 | errno = 0; |
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96 | v = strtol(arg, &endptr, base); |
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97 | return handle_errors(v, endp, endptr); |
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98 | } |
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99 | #endif |
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100 | |
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101 | #if UINT_MAX != ULONG_MAX |
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102 | unsigned bb_strtou(const char *arg, char **endp, int base) |
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103 | { |
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104 | unsigned long v; |
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105 | char *endptr; |
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106 | |
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107 | if (!isalnum(arg[0])) return ret_ERANGE(); |
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108 | errno = 0; |
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109 | v = strtoul(arg, &endptr, base); |
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110 | if (v > UINT_MAX) return ret_ERANGE(); |
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111 | return handle_errors(v, endp, endptr); |
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112 | } |
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113 | |
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114 | int bb_strtoi(const char *arg, char **endp, int base) |
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115 | { |
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116 | long v; |
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117 | char *endptr; |
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118 | |
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119 | if (arg[0] != '-' && !isalnum(arg[0])) return ret_ERANGE(); |
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120 | errno = 0; |
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121 | v = strtol(arg, &endptr, base); |
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122 | if (v > INT_MAX) return ret_ERANGE(); |
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123 | if (v < INT_MIN) return ret_ERANGE(); |
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124 | return handle_errors(v, endp, endptr); |
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125 | } |
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126 | #endif |
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127 | |
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128 | /* Floating point */ |
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129 | |
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130 | #if 0 |
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131 | |
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132 | #include <math.h> /* just for HUGE_VAL */ |
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133 | #define NOT_DIGIT(a) (((unsigned char)(a-'0')) > 9) |
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134 | double bb_strtod(const char *arg, char **endp) |
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135 | { |
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136 | double v; |
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137 | char *endptr; |
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138 | |
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139 | if (arg[0] != '-' && NOT_DIGIT(arg[0])) goto err; |
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140 | errno = 0; |
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141 | v = strtod(arg, &endptr); |
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142 | if (endp) *endp = endptr; |
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143 | if (endptr[0]) { |
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144 | /* "1234abcg" or out-of-range? */ |
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145 | if (isalnum(endptr[0]) || errno) { |
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146 | err: |
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147 | errno = ERANGE; |
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148 | return HUGE_VAL; |
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149 | } |
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150 | /* good number, just suspicious terminator */ |
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151 | errno = EINVAL; |
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152 | } |
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153 | return v; |
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154 | } |
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155 | |
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156 | #endif |
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