| 1 | /* A wrapper around strtol() and strtoul() to correct some |
| 2 | * "out of bounds" cases that don't work well on at least UTS. |
| 3 | * If a value is Larger than the max, strto[u]l should return |
| 4 | * the max value, and set errno to ERANGE |
| 5 | * The same if a value is smaller than the min value (only |
| 6 | * relevant for strtol(); not strtoul()), except the minimum |
| 7 | * value is returned (and errno == ERANGE). |
| 8 | */ |
| 9 | |
| 10 | #include <ctype.h> |
| 11 | #include <string.h> |
| 12 | #include <sys/errno.h> |
| 13 | #include <stdlib.h> |
| 14 | |
| 15 | extern int errno; |
| 16 | |
| 17 | #undef I32 |
| 18 | #undef U32 |
| 19 | |
| 20 | #define I32 int |
| 21 | #define U32 unsigned int |
| 22 | |
| 23 | struct base_info { |
| 24 | char *ValidChars; |
| 25 | |
| 26 | char *Ulong_max_str; |
| 27 | char *Long_max_str; |
| 28 | char *Long_min_str; /* Absolute value */ |
| 29 | |
| 30 | int Ulong_max_str_len; |
| 31 | int Long_max_str_len; |
| 32 | int Long_min_str_len; /* Absolute value */ |
| 33 | |
| 34 | U32 Ulong_max; |
| 35 | I32 Long_max; |
| 36 | I32 Long_min; /* NOT Absolute value */ |
| 37 | }; |
| 38 | static struct base_info Base_info[37]; |
| 39 | |
| 40 | static struct base_info Base_info_16 = { |
| 41 | "0123456789abcdefABCDEF", |
| 42 | "4294967295", "2147483648" /* <== ABS VAL */ , "2147483647", |
| 43 | 10, 10, 10, |
| 44 | 4294967295, 2147483647, - 2147483648, |
| 45 | }; |
| 46 | |
| 47 | static struct base_info Base_info_10 = { |
| 48 | "0123456789", |
| 49 | "4294967295", "2147483648" /* <== ABS VAL */ , "2147483647", |
| 50 | 10, 10, 10, |
| 51 | 4294967295, 2147483647, - 2147483648, |
| 52 | }; |
| 53 | |
| 54 | /* Used eventually (if this is fully developed) to hold info |
| 55 | * for processing bases 2-36. So that we can just plug the |
| 56 | * base in as a selector for its info, we sacrifice |
| 57 | * Base_info[0] and Base_info[1] (unless they are used |
| 58 | * at some point for special information). |
| 59 | */ |
| 60 | |
| 61 | /* This may be replaced later by something more universal */ |
| 62 | static void |
| 63 | init_Base_info() |
| 64 | { |
| 65 | if(Base_info[10].ValidChars) return; |
| 66 | Base_info[10] = Base_info_10; |
| 67 | Base_info[16] = Base_info_16; |
| 68 | } |
| 69 | |
| 70 | unsigned int |
| 71 | strtoul_wrap32(char *s, char **pEnd, int base) |
| 72 | { |
| 73 | int Len; |
| 74 | int isNegated = 0; |
| 75 | char *sOrig = s; |
| 76 | |
| 77 | init_Base_info(); |
| 78 | |
| 79 | while(*s && isspace(*s)) ++s; |
| 80 | |
| 81 | if(*s == '-') { |
| 82 | ++isNegated; |
| 83 | ++s; |
| 84 | while(*s && isspace(*s)) ++s; |
| 85 | } |
| 86 | if(base == 0) { |
| 87 | if(*s == '0') { |
| 88 | if(s[1] == 'x' || s[1] == 'X') { |
| 89 | s += 2; |
| 90 | base = 16; |
| 91 | } else { |
| 92 | ++s; |
| 93 | base = 8; |
| 94 | } |
| 95 | } else if(isdigit(*s)) { |
| 96 | base = 10; |
| 97 | } |
| 98 | } |
| 99 | if(base != 10) { |
| 100 | return strtoul(sOrig, pEnd, base); |
| 101 | } |
| 102 | |
| 103 | Len = strspn(s, Base_info[base].ValidChars); |
| 104 | |
| 105 | if(Len > Base_info[base].Ulong_max_str_len |
| 106 | || |
| 107 | (Len == Base_info[base].Ulong_max_str_len |
| 108 | && |
| 109 | strncmp(Base_info[base].Ulong_max_str, s, Len) < 0) |
| 110 | ) { |
| 111 | /* In case isNegated is set - what to do?? */ |
| 112 | /* Mightn't we say a negative number is ERANGE for strtoul? */ |
| 113 | errno = ERANGE; |
| 114 | return Base_info[base].Ulong_max; |
| 115 | } |
| 116 | |
| 117 | return strtoul(sOrig, pEnd, base); |
| 118 | } |
| 119 | |
| 120 | int |
| 121 | strtol_wrap32(char *s, char **pEnd, int base) |
| 122 | { |
| 123 | int Len; |
| 124 | int isNegated = 0; |
| 125 | char *sOrig = s; |
| 126 | |
| 127 | init_Base_info(); |
| 128 | |
| 129 | while(*s && isspace(*s)) ++s; |
| 130 | |
| 131 | if(*s == '-') { |
| 132 | ++isNegated; |
| 133 | ++s; |
| 134 | while(*s && isspace(*s)) ++s; |
| 135 | } |
| 136 | if(base == 0) { |
| 137 | if(*s == '0') { |
| 138 | if(s[1] == 'x' || s[1] == 'X') { |
| 139 | s += 2; |
| 140 | base = 16; |
| 141 | } else { |
| 142 | ++s; |
| 143 | base = 8; |
| 144 | } |
| 145 | } else if(isdigit(*s)) { |
| 146 | base = 10; |
| 147 | } |
| 148 | } |
| 149 | if(base != 10) { |
| 150 | return strtol(sOrig, pEnd, base); |
| 151 | } |
| 152 | |
| 153 | Len = strspn(s, Base_info[base].ValidChars); |
| 154 | |
| 155 | if(Len > Base_info[base].Long_max_str_len |
| 156 | || |
| 157 | (!isNegated && Len == Base_info[base].Long_max_str_len |
| 158 | && |
| 159 | strncmp(Base_info[base].Long_max_str, s, Len) < 0) |
| 160 | || |
| 161 | (isNegated && Len == Base_info[base].Long_min_str_len |
| 162 | && |
| 163 | strncmp(Base_info[base].Long_min_str, s, Len) < 0) |
| 164 | ) { |
| 165 | /* In case isNegated is set - what to do?? */ |
| 166 | /* Mightn't we say a negative number is ERANGE for strtol? */ |
| 167 | errno = ERANGE; |
| 168 | return(isNegated ? Base_info[base].Long_min |
| 169 | : |
| 170 | Base_info[base].Long_min); |
| 171 | } |
| 172 | |
| 173 | return strtol(sOrig, pEnd, base); |
| 174 | } |