[164] | 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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