1 /*- 2 * Copyright (c) 2014 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. [rescinded 22 July 1999] 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 33 @deftypefn Supplemental {long long int} strtoll (const char *@var{string}, @ 34 char **@var{endptr}, int @var{base}) 35 @deftypefnx Supplemental {unsigned long long int} strtoul (@ 36 const char *@var{string}, char **@var{endptr}, int @var{base}) 37 38 The @code{strtoll} function converts the string in @var{string} to a 39 long long integer value according to the given @var{base}, which must be 40 between 2 and 36 inclusive, or be the special value 0. If @var{base} 41 is 0, @code{strtoll} will look for the prefixes @code{0} and @code{0x} 42 to indicate bases 8 and 16, respectively, else default to base 10. 43 When the base is 16 (either explicitly or implicitly), a prefix of 44 @code{0x} is allowed. The handling of @var{endptr} is as that of 45 @code{strtod} above. The @code{strtoull} function is the same, except 46 that the converted value is unsigned. 47 48 @end deftypefn 49 50 */ 51 52 #ifdef HAVE_CONFIG_H 53 #include "config.h" 54 #endif 55 #ifdef HAVE_LIMITS_H 56 #include <limits.h> 57 #endif 58 #ifdef HAVE_SYS_PARAM_H 59 #include <sys/param.h> 60 #endif 61 #include <errno.h> 62 #ifdef NEED_DECLARATION_ERRNO 63 extern int errno; 64 #endif 65 #include "safe-ctype.h" 66 67 #ifdef HAVE_LONG_LONG 68 69 __extension__ 70 typedef unsigned long long ullong_type; 71 72 __extension__ 73 typedef long long llong_type; 74 75 /* FIXME: It'd be nice to configure around these, but the include files are too 76 painful. These macros should at least be more portable than hardwired hex 77 constants. */ 78 79 #ifndef ULLONG_MAX 80 #define ULLONG_MAX (~(ullong_type)0) /* 0xFFFFFFFFFFFFFFFF */ 81 #endif 82 83 #ifndef LLONG_MAX 84 #define LLONG_MAX ((llong_type)(ULLONG_MAX >> 1)) /* 0x7FFFFFFFFFFFFFFF */ 85 #endif 86 87 #ifndef LLONG_MIN 88 #define LLONG_MIN (~LLONG_MAX) /* 0x8000000000000000 */ 89 #endif 90 91 /* 92 * Convert a string to a long long integer. 93 * 94 * Ignores `locale' stuff. Assumes that the upper and lower case 95 * alphabets and digits are each contiguous. 96 */ 97 llong_type 98 strtoll(const char *nptr, char **endptr, register int base) 99 { 100 register const char *s = nptr; 101 register ullong_type acc; 102 register int c; 103 register ullong_type cutoff; 104 register int neg = 0, any, cutlim; 105 106 /* 107 * Skip white space and pick up leading +/- sign if any. 108 * If base is 0, allow 0x for hex and 0 for octal, else 109 * assume decimal; if base is already 16, allow 0x. 110 */ 111 do { 112 c = *s++; 113 } while (ISSPACE(c)); 114 if (c == '-') { 115 neg = 1; 116 c = *s++; 117 } else if (c == '+') 118 c = *s++; 119 if ((base == 0 || base == 16) && 120 c == '0' && (*s == 'x' || *s == 'X')) { 121 c = s[1]; 122 s += 2; 123 base = 16; 124 } 125 if (base == 0) 126 base = c == '0' ? 8 : 10; 127 128 /* 129 * Compute the cutoff value between legal numbers and illegal 130 * numbers. That is the largest legal value, divided by the 131 * base. An input number that is greater than this value, if 132 * followed by a legal input character, is too big. One that 133 * is equal to this value may be valid or not; the limit 134 * between valid and invalid numbers is then based on the last 135 * digit. For instance, if the range for longs is 136 * [-2147483648..2147483647] and the input base is 10, 137 * cutoff will be set to 214748364 and cutlim to either 138 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated 139 * a value > 214748364, or equal but the next digit is > 7 (or 8), 140 * the number is too big, and we will return a range error. 141 * 142 * Set any if any `digits' consumed; make it negative to indicate 143 * overflow. 144 */ 145 cutoff = neg ? -(ullong_type)LLONG_MIN : LLONG_MAX; 146 cutlim = cutoff % (ullong_type)base; 147 cutoff /= (ullong_type)base; 148 for (acc = 0, any = 0;; c = *s++) { 149 if (ISDIGIT(c)) 150 c -= '0'; 151 else if (ISALPHA(c)) 152 c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10; 153 else 154 break; 155 if (c >= base) 156 break; 157 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) 158 any = -1; 159 else { 160 any = 1; 161 acc *= base; 162 acc += c; 163 } 164 } 165 if (any < 0) { 166 acc = neg ? LLONG_MIN : LLONG_MAX; 167 errno = ERANGE; 168 } else if (neg) 169 acc = -acc; 170 if (endptr != 0) 171 *endptr = (char *) (any ? s - 1 : nptr); 172 return (acc); 173 } 174 175 #endif /* ifdef HAVE_LONG_LONG */ 176
