1 | /* |
---|
2 | FUNCTION |
---|
3 | <<strtol>>, <<strtol_l>>---string to long |
---|
4 | |
---|
5 | INDEX |
---|
6 | strtol |
---|
7 | |
---|
8 | INDEX |
---|
9 | strtol_l |
---|
10 | |
---|
11 | INDEX |
---|
12 | _strtol_r |
---|
13 | |
---|
14 | SYNOPSIS |
---|
15 | #include <stdlib.h> |
---|
16 | long strtol(const char *restrict <[s]>, char **restrict <[ptr]>, |
---|
17 | int <[base]>); |
---|
18 | |
---|
19 | #include <stdlib.h> |
---|
20 | long strtol_l(const char *restrict <[s]>, char **restrict <[ptr]>, |
---|
21 | int <[base]>, locale_t <[locale]>); |
---|
22 | |
---|
23 | long _strtol_r(void *<[reent]>, const char *restrict <[s]>, |
---|
24 | char **restrict <[ptr]>,int <[base]>); |
---|
25 | |
---|
26 | DESCRIPTION |
---|
27 | The function <<strtol>> converts the string <<*<[s]>>> to |
---|
28 | a <<long>>. First, it breaks down the string into three parts: |
---|
29 | leading whitespace, which is ignored; a subject string consisting |
---|
30 | of characters resembling an integer in the radix specified by <[base]>; |
---|
31 | and a trailing portion consisting of zero or more unparseable characters, |
---|
32 | and always including the terminating null character. Then, it attempts |
---|
33 | to convert the subject string into a <<long>> and returns the |
---|
34 | result. |
---|
35 | |
---|
36 | If the value of <[base]> is 0, the subject string is expected to look |
---|
37 | like a normal C integer constant: an optional sign, a possible `<<0x>>' |
---|
38 | indicating a hexadecimal base, and a number. If <[base]> is between |
---|
39 | 2 and 36, the expected form of the subject is a sequence of letters |
---|
40 | and digits representing an integer in the radix specified by <[base]>, |
---|
41 | with an optional plus or minus sign. The letters <<a>>--<<z>> (or, |
---|
42 | equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35; |
---|
43 | only letters whose ascribed values are less than <[base]> are |
---|
44 | permitted. If <[base]> is 16, a leading <<0x>> is permitted. |
---|
45 | |
---|
46 | The subject sequence is the longest initial sequence of the input |
---|
47 | string that has the expected form, starting with the first |
---|
48 | non-whitespace character. If the string is empty or consists entirely |
---|
49 | of whitespace, or if the first non-whitespace character is not a |
---|
50 | permissible letter or digit, the subject string is empty. |
---|
51 | |
---|
52 | If the subject string is acceptable, and the value of <[base]> is zero, |
---|
53 | <<strtol>> attempts to determine the radix from the input string. A |
---|
54 | string with a leading <<0x>> is treated as a hexadecimal value; a string with |
---|
55 | a leading 0 and no <<x>> is treated as octal; all other strings are |
---|
56 | treated as decimal. If <[base]> is between 2 and 36, it is used as the |
---|
57 | conversion radix, as described above. If the subject string begins with |
---|
58 | a minus sign, the value is negated. Finally, a pointer to the first |
---|
59 | character past the converted subject string is stored in <[ptr]>, if |
---|
60 | <[ptr]> is not <<NULL>>. |
---|
61 | |
---|
62 | If the subject string is empty (or not in acceptable form), no conversion |
---|
63 | is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is |
---|
64 | not <<NULL>>). |
---|
65 | |
---|
66 | <<strtol_l>> is like <<strtol>> but performs the conversion based on the |
---|
67 | locale specified by the locale object locale. If <[locale]> is |
---|
68 | LC_GLOBAL_LOCALE or not a valid locale object, the behaviour is undefined. |
---|
69 | |
---|
70 | The alternate function <<_strtol_r>> is a reentrant version. The |
---|
71 | extra argument <[reent]> is a pointer to a reentrancy structure. |
---|
72 | |
---|
73 | RETURNS |
---|
74 | <<strtol>>, <<strtol_l>> return the converted value, if any. If no |
---|
75 | conversion was made, 0 is returned. |
---|
76 | |
---|
77 | <<strtol>>, <<strtol_l>> return <<LONG_MAX>> or <<LONG_MIN>> if the |
---|
78 | magnitude of the converted value is too large, and sets <<errno>> |
---|
79 | to <<ERANGE>>. |
---|
80 | |
---|
81 | PORTABILITY |
---|
82 | <<strtol>> is ANSI. |
---|
83 | <<strtol_l>> is a GNU extension. |
---|
84 | |
---|
85 | No supporting OS subroutines are required. |
---|
86 | */ |
---|
87 | |
---|
88 | /*- |
---|
89 | * Copyright (c) 1990 The Regents of the University of California. |
---|
90 | * All rights reserved. |
---|
91 | * |
---|
92 | * Redistribution and use in source and binary forms, with or without |
---|
93 | * modification, are permitted provided that the following conditions |
---|
94 | * are met: |
---|
95 | * 1. Redistributions of source code must retain the above copyright |
---|
96 | * notice, this list of conditions and the following disclaimer. |
---|
97 | * 2. Redistributions in binary form must reproduce the above copyright |
---|
98 | * notice, this list of conditions and the following disclaimer in the |
---|
99 | * documentation and/or other materials provided with the distribution. |
---|
100 | * 3. All advertising materials mentioning features or use of this software |
---|
101 | * must display the following acknowledgement: |
---|
102 | * This product includes software developed by the University of |
---|
103 | * California, Berkeley and its contributors. |
---|
104 | * 4. Neither the name of the University nor the names of its contributors |
---|
105 | * may be used to endorse or promote products derived from this software |
---|
106 | * without specific prior written permission. |
---|
107 | * |
---|
108 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
---|
109 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
---|
110 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
---|
111 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
---|
112 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
---|
113 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
---|
114 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
---|
115 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
---|
116 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
---|
117 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
---|
118 | * SUCH DAMAGE. |
---|
119 | */ |
---|
120 | |
---|
121 | #define _GNU_SOURCE |
---|
122 | #include <_ansi.h> |
---|
123 | #include <limits.h> |
---|
124 | #include <ctype.h> |
---|
125 | #include <errno.h> |
---|
126 | #include <stdlib.h> |
---|
127 | #include <reent.h> |
---|
128 | #include "../locale/setlocale.h" |
---|
129 | |
---|
130 | /* |
---|
131 | * Convert a string to a long integer. |
---|
132 | */ |
---|
133 | static long |
---|
134 | _strtol_l (struct _reent *rptr, const char *__restrict nptr, |
---|
135 | char **__restrict endptr, int base, locale_t loc) |
---|
136 | { |
---|
137 | register const unsigned char *s = (const unsigned char *)nptr; |
---|
138 | register unsigned long acc; |
---|
139 | register int c; |
---|
140 | register unsigned long cutoff; |
---|
141 | register int neg = 0, any, cutlim; |
---|
142 | |
---|
143 | /* |
---|
144 | * Skip white space and pick up leading +/- sign if any. |
---|
145 | * If base is 0, allow 0x for hex and 0 for octal, else |
---|
146 | * assume decimal; if base is already 16, allow 0x. |
---|
147 | */ |
---|
148 | do { |
---|
149 | c = *s++; |
---|
150 | } while (isspace_l(c, loc)); |
---|
151 | if (c == '-') { |
---|
152 | neg = 1; |
---|
153 | c = *s++; |
---|
154 | } else if (c == '+') |
---|
155 | c = *s++; |
---|
156 | if ((base == 0 || base == 16) && |
---|
157 | c == '0' && (*s == 'x' || *s == 'X')) { |
---|
158 | c = s[1]; |
---|
159 | s += 2; |
---|
160 | base = 16; |
---|
161 | } |
---|
162 | if (base == 0) |
---|
163 | base = c == '0' ? 8 : 10; |
---|
164 | |
---|
165 | /* |
---|
166 | * Compute the cutoff value between legal numbers and illegal |
---|
167 | * numbers. That is the largest legal value, divided by the |
---|
168 | * base. An input number that is greater than this value, if |
---|
169 | * followed by a legal input character, is too big. One that |
---|
170 | * is equal to this value may be valid or not; the limit |
---|
171 | * between valid and invalid numbers is then based on the last |
---|
172 | * digit. For instance, if the range for longs is |
---|
173 | * [-2147483648..2147483647] and the input base is 10, |
---|
174 | * cutoff will be set to 214748364 and cutlim to either |
---|
175 | * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated |
---|
176 | * a value > 214748364, or equal but the next digit is > 7 (or 8), |
---|
177 | * the number is too big, and we will return a range error. |
---|
178 | * |
---|
179 | * Set any if any `digits' consumed; make it negative to indicate |
---|
180 | * overflow. |
---|
181 | */ |
---|
182 | cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX; |
---|
183 | cutlim = cutoff % (unsigned long)base; |
---|
184 | cutoff /= (unsigned long)base; |
---|
185 | for (acc = 0, any = 0;; c = *s++) { |
---|
186 | if (c >= '0' && c <= '9') |
---|
187 | c -= '0'; |
---|
188 | else if (c >= 'A' && c <= 'Z') |
---|
189 | c -= 'A' - 10; |
---|
190 | else if (c >= 'a' && c <= 'z') |
---|
191 | c -= 'a' - 10; |
---|
192 | else |
---|
193 | break; |
---|
194 | if (c >= base) |
---|
195 | break; |
---|
196 | if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) |
---|
197 | any = -1; |
---|
198 | else { |
---|
199 | any = 1; |
---|
200 | acc *= base; |
---|
201 | acc += c; |
---|
202 | } |
---|
203 | } |
---|
204 | if (any < 0) { |
---|
205 | acc = neg ? LONG_MIN : LONG_MAX; |
---|
206 | rptr->_errno = ERANGE; |
---|
207 | } else if (neg) |
---|
208 | acc = -acc; |
---|
209 | if (endptr != 0) |
---|
210 | *endptr = (char *) (any ? (char *)s - 1 : nptr); |
---|
211 | return (acc); |
---|
212 | } |
---|
213 | |
---|
214 | long |
---|
215 | _strtol_r (struct _reent *rptr, |
---|
216 | const char *__restrict nptr, |
---|
217 | char **__restrict endptr, |
---|
218 | int base) |
---|
219 | { |
---|
220 | return _strtol_l (rptr, nptr, endptr, base, __get_current_locale ()); |
---|
221 | } |
---|
222 | |
---|
223 | #ifndef _REENT_ONLY |
---|
224 | |
---|
225 | long |
---|
226 | strtol_l (const char *__restrict s, char **__restrict ptr, int base, |
---|
227 | locale_t loc) |
---|
228 | { |
---|
229 | return _strtol_l (_REENT, s, ptr, base, loc); |
---|
230 | } |
---|
231 | |
---|
232 | long |
---|
233 | strtol (const char *__restrict s, |
---|
234 | char **__restrict ptr, |
---|
235 | int base) |
---|
236 | { |
---|
237 | return _strtol_l (_REENT, s, ptr, base, __get_current_locale ()); |
---|
238 | } |
---|
239 | |
---|
240 | #endif |
---|