[337] | 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 - 2017, 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 <errno.h>
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| 24 | #include "curl_setup.h"
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| 25 |
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| 26 | #include "strtoofft.h"
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| 27 |
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| 28 | /*
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| 29 | * NOTE:
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| 30 | *
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| 31 | * In the ISO C standard (IEEE Std 1003.1), there is a strtoimax() function we
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| 32 | * could use in case strtoll() doesn't exist... See
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| 33 | * https://www.opengroup.org/onlinepubs/009695399/functions/strtoimax.html
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| 34 | */
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| 35 |
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| 36 | #if (SIZEOF_CURL_OFF_T > SIZEOF_LONG)
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| 37 | # ifdef HAVE_STRTOLL
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| 38 | # define strtooff strtoll
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| 39 | # else
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| 40 | # if defined(_MSC_VER) && (_MSC_VER >= 1300) && (_INTEGRAL_MAX_BITS >= 64)
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| 41 | # if defined(_SAL_VERSION)
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| 42 | _Check_return_ _CRTIMP __int64 __cdecl _strtoi64(
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| 43 | _In_z_ const char *_String,
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| 44 | _Out_opt_ _Deref_post_z_ char **_EndPtr, _In_ int _Radix);
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| 45 | # else
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| 46 | _CRTIMP __int64 __cdecl _strtoi64(const char *_String,
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| 47 | char **_EndPtr, int _Radix);
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| 48 | # endif
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| 49 | # define strtooff _strtoi64
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| 50 | # else
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| 51 | # define PRIVATE_STRTOOFF 1
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| 52 | # endif
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| 53 | # endif
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| 54 | #else
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| 55 | # define strtooff strtol
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| 56 | #endif
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| 57 |
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| 58 | #ifdef PRIVATE_STRTOOFF
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| 59 |
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| 60 | /* Range tests can be used for alphanum decoding if characters are consecutive,
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| 61 | like in ASCII. Else an array is scanned. Determine this condition now. */
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| 62 |
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| 63 | #if('9' - '0') != 9 || ('Z' - 'A') != 25 || ('z' - 'a') != 25
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| 64 |
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| 65 | #define NO_RANGE_TEST
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| 66 |
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| 67 | static const char valchars[] =
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| 68 | "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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| 69 | #endif
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| 70 |
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| 71 | static int get_char(char c, int base);
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| 72 |
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| 73 | /**
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| 74 | * Custom version of the strtooff function. This extracts a curl_off_t
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| 75 | * value from the given input string and returns it.
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| 76 | */
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| 77 | static curl_off_t strtooff(const char *nptr, char **endptr, int base)
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| 78 | {
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| 79 | char *end;
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| 80 | int is_negative = 0;
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| 81 | int overflow;
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| 82 | int i;
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| 83 | curl_off_t value = 0;
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| 84 | curl_off_t newval;
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| 85 |
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| 86 | /* Skip leading whitespace. */
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| 87 | end = (char *)nptr;
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| 88 | while(ISSPACE(end[0])) {
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| 89 | end++;
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| 90 | }
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| 91 |
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| 92 | /* Handle the sign, if any. */
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| 93 | if(end[0] == '-') {
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| 94 | is_negative = 1;
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| 95 | end++;
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| 96 | }
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| 97 | else if(end[0] == '+') {
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| 98 | end++;
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| 99 | }
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| 100 | else if(end[0] == '\0') {
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| 101 | /* We had nothing but perhaps some whitespace -- there was no number. */
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| 102 | if(endptr) {
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| 103 | *endptr = end;
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| 104 | }
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| 105 | return 0;
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| 106 | }
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| 107 |
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| 108 | /* Handle special beginnings, if present and allowed. */
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| 109 | if(end[0] == '0' && end[1] == 'x') {
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| 110 | if(base == 16 || base == 0) {
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| 111 | end += 2;
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| 112 | base = 16;
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| 113 | }
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| 114 | }
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| 115 | else if(end[0] == '0') {
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| 116 | if(base == 8 || base == 0) {
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| 117 | end++;
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| 118 | base = 8;
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| 119 | }
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| 120 | }
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| 121 |
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| 122 | /* Matching strtol, if the base is 0 and it doesn't look like
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| 123 | * the number is octal or hex, we assume it's base 10.
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| 124 | */
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| 125 | if(base == 0) {
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| 126 | base = 10;
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| 127 | }
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| 128 |
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| 129 | /* Loop handling digits. */
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| 130 | value = 0;
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| 131 | overflow = 0;
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| 132 | for(i = get_char(end[0], base);
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| 133 | i != -1;
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| 134 | end++, i = get_char(end[0], base)) {
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| 135 | newval = base * value + i;
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| 136 | if(newval < value) {
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| 137 | /* We've overflowed. */
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| 138 | overflow = 1;
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| 139 | break;
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| 140 | }
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| 141 | else
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| 142 | value = newval;
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| 143 | }
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| 144 |
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| 145 | if(!overflow) {
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| 146 | if(is_negative) {
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| 147 | /* Fix the sign. */
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| 148 | value *= -1;
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| 149 | }
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| 150 | }
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| 151 | else {
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| 152 | if(is_negative)
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| 153 | value = CURL_OFF_T_MIN;
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| 154 | else
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| 155 | value = CURL_OFF_T_MAX;
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| 156 |
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| 157 | errno = ERANGE;
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| 158 | }
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| 159 |
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| 160 | if(endptr)
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| 161 | *endptr = end;
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| 162 |
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| 163 | return value;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * Returns the value of c in the given base, or -1 if c cannot
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| 168 | * be interpreted properly in that base (i.e., is out of range,
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| 169 | * is a null, etc.).
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| 170 | *
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| 171 | * @param c the character to interpret according to base
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| 172 | * @param base the base in which to interpret c
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| 173 | *
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| 174 | * @return the value of c in base, or -1 if c isn't in range
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| 175 | */
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| 176 | static int get_char(char c, int base)
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| 177 | {
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| 178 | #ifndef NO_RANGE_TEST
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| 179 | int value = -1;
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| 180 | if(c <= '9' && c >= '0') {
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| 181 | value = c - '0';
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| 182 | }
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| 183 | else if(c <= 'Z' && c >= 'A') {
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| 184 | value = c - 'A' + 10;
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| 185 | }
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| 186 | else if(c <= 'z' && c >= 'a') {
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| 187 | value = c - 'a' + 10;
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| 188 | }
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| 189 | #else
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| 190 | const char *cp;
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| 191 | int value;
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| 192 |
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| 193 | cp = memchr(valchars, c, 10 + 26 + 26);
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| 194 |
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| 195 | if(!cp)
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| 196 | return -1;
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| 197 |
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| 198 | value = cp - valchars;
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| 199 |
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| 200 | if(value >= 10 + 26)
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| 201 | value -= 26; /* Lowercase. */
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| 202 | #endif
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| 203 |
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| 204 | if(value >= base) {
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| 205 | value = -1;
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| 206 | }
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| 207 |
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| 208 | return value;
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| 209 | }
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| 210 | #endif /* Only present if we need strtoll, but don't have it. */
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| 211 |
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| 212 | /*
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| 213 | * Parse a *positive* up to 64 bit number written in ascii.
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| 214 | */
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| 215 | CURLofft curlx_strtoofft(const char *str, char **endp, int base,
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| 216 | curl_off_t *num)
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| 217 | {
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| 218 | char *end;
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| 219 | curl_off_t number;
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| 220 | errno = 0;
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| 221 | *num = 0; /* clear by default */
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| 222 |
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| 223 | DEBUGASSERT(str);
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| 224 |
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| 225 | while(*str && ISSPACE(*str))
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| 226 | str++;
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| 227 | if('-' == *str) {
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| 228 | if(endp)
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| 229 | *endp = (char *)str; /* didn't actually move */
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| 230 | return CURL_OFFT_INVAL; /* nothing parsed */
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| 231 | }
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| 232 | number = strtooff(str, &end, base);
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| 233 | if(endp)
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| 234 | *endp = end;
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| 235 | if(errno == ERANGE)
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| 236 | /* overflow/underflow */
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| 237 | return CURL_OFFT_FLOW;
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| 238 | else if(str == end)
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| 239 | /* nothing parsed */
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| 240 | return CURL_OFFT_INVAL;
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| 241 |
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| 242 | *num = number;
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| 243 | return CURL_OFFT_OK;
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| 244 | }
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