1 /*
2 FUNCTION
3 <<strtoll>>, <<strtoll_l>>---string to long long
4
5 INDEX
6 strtoll
7
8 INDEX
9 strtoll_l
10
11 INDEX
12 _strtoll_r
13
14 SYNOPSIS
15 #include <stdlib.h>
16 long long strtoll(const char *restrict <[s]>, char **restrict <[ptr]>,
17 int <[base]>);
18
19 #include <stdlib.h>
20 long long strtoll_l(const char *restrict <[s]>,
21 char **restrict <[ptr]>, int <[base]>,
22 locale_t <[locale]>);
23
24 long long _strtoll_r(void *<[reent]>,
25 const char *restrict <[s]>,
26 char **restrict <[ptr]>, int <[base]>);
27
28 DESCRIPTION
29 The function <<strtoll>> converts the string <<*<[s]>>> to
30 a <<long long>>. First, it breaks down the string into three parts:
31 leading whitespace, which is ignored; a subject string consisting
32 of characters resembling an integer in the radix specified by <[base]>;
33 and a trailing portion consisting of zero or more unparseable characters,
34 and always including the terminating null character. Then, it attempts
35 to convert the subject string into a <<long long>> and returns the
36 result.
37
38 If the value of <[base]> is 0, the subject string is expected to look
39 like a normal C integer constant: an optional sign, a possible `<<0x>>'
40 indicating a hexadecimal base, and a number. If <[base]> is between
41 2 and 36, the expected form of the subject is a sequence of letters
42 and digits representing an integer in the radix specified by <[base]>,
43 with an optional plus or minus sign. The letters <<a>>--<<z>> (or,
44 equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35;
45 only letters whose ascribed values are less than <[base]> are
46 permitted. If <[base]> is 16, a leading <<0x>> is permitted.
47
48 The subject sequence is the longest initial sequence of the input
49 string that has the expected form, starting with the first
50 non-whitespace character. If the string is empty or consists entirely
51 of whitespace, or if the first non-whitespace character is not a
52 permissible letter or digit, the subject string is empty.
53
54 If the subject string is acceptable, and the value of <[base]> is zero,
55 <<strtoll>> attempts to determine the radix from the input string. A
56 string with a leading <<0x>> is treated as a hexadecimal value; a string with
57 a leading 0 and no <<x>> is treated as octal; all other strings are
58 treated as decimal. If <[base]> is between 2 and 36, it is used as the
59 conversion radix, as described above. If the subject string begins with
60 a minus sign, the value is negated. Finally, a pointer to the first
61 character past the converted subject string is stored in <[ptr]>, if
62 <[ptr]> is not <<NULL>>.
63
64 If the subject string is empty (or not in acceptable form), no conversion
65 is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
66 not <<NULL>>).
67
68 <<strtoll_l>> is like <<strtoll>> but performs the conversion based on the
69 locale specified by the locale object locale. If <[locale]> is
70 LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined.
71
72 The alternate function <<_strtoll_r>> is a reentrant version. The
73 extra argument <[reent]> is a pointer to a reentrancy structure.
74
75 RETURNS
76 <<strtoll>>, <<strtoll_l>> return the converted value, if any. If no
77 conversion was made, 0 is returned.
78
79 <<strtoll>>, <<strtoll_l>> return <<LONG_LONG_MAX>> or <<LONG_LONG_MIN>>
80 if the magnitude of the converted value is too large, and sets <<errno>>
81 to <<ERANGE>>.
82
83 PORTABILITY
84 <<strtoll>> is ANSI.
85 <<strtoll_l>> is a GNU extension.
86
87 No supporting OS subroutines are required.
88 */
89
90 /*-
91 * Copyright (c) 1990 The Regents of the University of California.
92 * All rights reserved.
93 *
94 * Redistribution and use in source and binary forms, with or without
95 * modification, are permitted provided that the following conditions
96 * are met:
97 * 1. Redistributions of source code must retain the above copyright
98 * notice, this list of conditions and the following disclaimer.
99 * 2. Redistributions in binary form must reproduce the above copyright
100 * notice, this list of conditions and the following disclaimer in the
101 * documentation and/or other materials provided with the distribution.
102 * 3. Neither the name of the University nor the names of its contributors
103 * may be used to endorse or promote products derived from this software
104 * without specific prior written permission.
105 *
106 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
107 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
108 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
109 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
110 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
111 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
112 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
113 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
114 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
115 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
116 * SUCH DAMAGE.
117 */
118
119 #define _GNU_SOURCE
120 #include <_ansi.h>
121 #include <limits.h>
122 #include <ctype.h>
123 #include <errno.h>
124 #include <stdlib.h>
125 #include "../locale/setlocale.h"
126
127 /*
128 * Convert a string to a long long integer.
129 */
130 static long long
_strtoll_l(const char * __restrict nptr,char ** __restrict endptr,int base,locale_t loc)131 _strtoll_l (const char *__restrict nptr,
132 char **__restrict endptr, int base, locale_t loc)
133 {
134 register const unsigned char *s = (const unsigned char *)nptr;
135 register unsigned long long acc;
136 register int c;
137 register unsigned long long cutoff;
138 register int neg = 0, any, cutlim;
139
140 /*
141 * Skip white space and pick up leading +/- sign if any.
142 * If base is 0, allow 0x for hex and 0 for octal, else
143 * assume decimal; if base is already 16, allow 0x.
144 */
145 do {
146 c = *s++;
147 } while (isspace_l(c, loc));
148 if (c == '-') {
149 neg = 1;
150 c = *s++;
151 } else if (c == '+')
152 c = *s++;
153 if ((base == 0 || base == 16) &&
154 c == '0' && (*s == 'x' || *s == 'X')) {
155 c = s[1];
156 s += 2;
157 base = 16;
158 }
159 if (base == 0)
160 base = c == '0' ? 8 : 10;
161
162 /*
163 * Compute the cutoff value between legal numbers and illegal
164 * numbers. That is the largest legal value, divided by the
165 * base. An input number that is greater than this value, if
166 * followed by a legal input character, is too big. One that
167 * is equal to this value may be valid or not; the limit
168 * between valid and invalid numbers is then based on the last
169 * digit. For instance, if the range for longs is
170 * [-2147483648..2147483647] and the input base is 10,
171 * cutoff will be set to 214748364 and cutlim to either
172 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
173 * a value > 214748364, or equal but the next digit is > 7 (or 8),
174 * the number is too big, and we will return a range error.
175 *
176 * Set any if any `digits' consumed; make it negative to indicate
177 * overflow.
178 */
179 cutoff = neg ? -(unsigned long long)LLONG_MIN : LLONG_MAX;
180 cutlim = cutoff % (unsigned long long)base;
181 cutoff /= (unsigned long long)base;
182 for (acc = 0, any = 0;; c = *s++) {
183 if (c >= '0' && c <= '9')
184 c -= '0';
185 else if (c >= 'A' && c <= 'Z')
186 c -= 'A' - 10;
187 else if (c >= 'a' && c <= 'z')
188 c -= 'a' - 10;
189 else
190 break;
191 if (c >= base)
192 break;
193 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
194 any = -1;
195 else {
196 any = 1;
197 acc *= base;
198 acc += c;
199 }
200 }
201 if (any < 0) {
202 acc = neg ? LLONG_MIN : LLONG_MAX;
203 _REENT_ERRNO(rptr) = ERANGE;
204 } else if (neg)
205 acc = -acc;
206 if (endptr != 0)
207 *endptr = (char *) (any ? (char *)s - 1 : nptr);
208 return (acc);
209 }
210
211 #ifndef _REENT_ONLY
212
213 long long
strtoll_l(const char * __restrict s,char ** __restrict ptr,int base,locale_t loc)214 strtoll_l (const char *__restrict s, char **__restrict ptr, int base,
215 locale_t loc)
216 {
217 return _strtoll_l (s, ptr, base, loc);
218 }
219
220 long long
strtoll(const char * __restrict s,char ** __restrict ptr,int base)221 strtoll (const char *__restrict s,
222 char **__restrict ptr,
223 int base)
224 {
225 return _strtoll_l (s, ptr, base, __get_current_locale ());
226 }
227
228 #endif
229
