1 /*
2 FUNCTION
3 <<strtol>>---string to long
4
5 INDEX
6 strtol
7 INDEX
8 _strtol_r
9
10 ANSI_SYNOPSIS
11 #include <stdlib.h>
12 long strtol(const char *restrict <[s]>, char **restrict <[ptr]>,int <[base]>);
13
14 long _strtol_r(void *<[reent]>,
15 const char *restrict <[s]>, char **restrict <[ptr]>,int <[base]>);
16
17 TRAD_SYNOPSIS
18 #include <stdlib.h>
19 long strtol (<[s]>, <[ptr]>, <[base]>)
20 char *<[s]>;
21 char **<[ptr]>;
22 int <[base]>;
23
24 long _strtol_r (<[reent]>, <[s]>, <[ptr]>, <[base]>)
25 char *<[reent]>;
26 char *<[s]>;
27 char **<[ptr]>;
28 int <[base]>;
29
30 DESCRIPTION
31 The function <<strtol>> converts the string <<*<[s]>>> to
32 a <<long>>. First, it breaks down the string into three parts:
33 leading whitespace, which is ignored; a subject string consisting
34 of characters resembling an integer in the radix specified by <[base]>;
35 and a trailing portion consisting of zero or more unparseable characters,
36 and always including the terminating null character. Then, it attempts
37 to convert the subject string into a <<long>> and returns the
38 result.
39
40 If the value of <[base]> is 0, the subject string is expected to look
41 like a normal C integer constant: an optional sign, a possible `<<0x>>'
42 indicating a hexadecimal base, and a number. If <[base]> is between
43 2 and 36, the expected form of the subject is a sequence of letters
44 and digits representing an integer in the radix specified by <[base]>,
45 with an optional plus or minus sign. The letters <<a>>--<<z>> (or,
46 equivalently, <<A>>--<<Z>>) are used to signify values from 10 to 35;
47 only letters whose ascribed values are less than <[base]> are
48 permitted. If <[base]> is 16, a leading <<0x>> is permitted.
49
50 The subject sequence is the longest initial sequence of the input
51 string that has the expected form, starting with the first
52 non-whitespace character. If the string is empty or consists entirely
53 of whitespace, or if the first non-whitespace character is not a
54 permissible letter or digit, the subject string is empty.
55
56 If the subject string is acceptable, and the value of <[base]> is zero,
57 <<strtol>> attempts to determine the radix from the input string. A
58 string with a leading <<0x>> is treated as a hexadecimal value; a string with
59 a leading 0 and no <<x>> is treated as octal; all other strings are
60 treated as decimal. If <[base]> is between 2 and 36, it is used as the
61 conversion radix, as described above. If the subject string begins with
62 a minus sign, the value is negated. Finally, a pointer to the first
63 character past the converted subject string is stored in <[ptr]>, if
64 <[ptr]> is not <<NULL>>.
65
66 If the subject string is empty (or not in acceptable form), no conversion
67 is performed and the value of <[s]> is stored in <[ptr]> (if <[ptr]> is
68 not <<NULL>>).
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>> returns the converted value, if any. If no conversion was
75 made, 0 is returned.
76
77 <<strtol>> returns <<LONG_MAX>> or <<LONG_MIN>> if the magnitude of
78 the converted value is too large, and sets <<errno>> to <<ERANGE>>.
79
80 PORTABILITY
81 <<strtol>> is ANSI.
82
83 No supporting OS subroutines are required.
84 */
85
86 /*-
87 * Copyright (c) 1990 The Regents of the University of California.
88 * All rights reserved.
89 *
90 * Redistribution and use in source and binary forms, with or without
91 * modification, are permitted provided that the following conditions
92 * are met:
93 * 1. Redistributions of source code must retain the above copyright
94 * notice, this list of conditions and the following disclaimer.
95 * 2. Redistributions in binary form must reproduce the above copyright
96 * notice, this list of conditions and the following disclaimer in the
97 * documentation and/or other materials provided with the distribution.
98 * 3. All advertising materials mentioning features or use of this software
99 * must display the following acknowledgement:
100 * This product includes software developed by the University of
101 * California, Berkeley and its contributors.
102 * 4. 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 #include <errno.h>
120 #include <section_config.h>
121 #include <basic_types.h>
122 #include <strproc.h>
123
124 #include <string.h>
125 #include <limits.h>
126
127 /*
128 * Convert a string to a long integer.
129 *
130 * Ignores `locale' stuff. Assumes that the upper and lower case
131 * alphabets and digits are each contiguous.
132 */
133 LIBC_ROM_TEXT_SECTION
134 _LONG_CALL_
135 long
_strtol_r(_CONST char * nptr,char ** endptr,int base)136 _strtol_r (
137 _CONST char * nptr ,
138 char ** endptr ,
139 int base)
140 {
141 register const unsigned char *s = (const unsigned char *)nptr;
142 register unsigned long acc;
143 register int c;
144 register unsigned long cutoff;
145 register int neg = 0, any, cutlim;
146
147 /*
148 * Skip white space and pick up leading +/- sign if any.
149 * If base is 0, allow 0x for hex and 0 for octal, else
150 * assume decimal; if base is already 16, allow 0x.
151 */
152 do {
153 c = *s++;
154 } while (isspace(c));
155 if (c == '-') {
156 neg = 1;
157 c = *s++;
158 } else if (c == '+')
159 c = *s++;
160 if ((base == 0 || base == 16) &&
161 c == '0' && (*s == 'x' || *s == 'X')) {
162 c = s[1];
163 s += 2;
164 base = 16;
165 }
166 if (base == 0)
167 base = c == '0' ? 8 : 10;
168
169 /*
170 * Compute the cutoff value between legal numbers and illegal
171 * numbers. That is the largest legal value, divided by the
172 * base. An input number that is greater than this value, if
173 * followed by a legal input character, is too big. One that
174 * is equal to this value may be valid or not; the limit
175 * between valid and invalid numbers is then based on the last
176 * digit. For instance, if the range for longs is
177 * [-2147483648..2147483647] and the input base is 10,
178 * cutoff will be set to 214748364 and cutlim to either
179 * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
180 * a value > 214748364, or equal but the next digit is > 7 (or 8),
181 * the number is too big, and we will return a range error.
182 *
183 * Set any if any `digits' consumed; make it negative to indicate
184 * overflow.
185 */
186 cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
187 cutlim = cutoff % (unsigned long)base;
188 cutoff /= (unsigned long)base;
189 for (acc = 0, any = 0;; c = *s++) {
190 if (isdigit(c))
191 c -= '0';
192 else if (isalpha(c))
193 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
194 else
195 break;
196 if (c >= base)
197 break;
198 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
199 any = -1;
200 else {
201 any = 1;
202 acc *= base;
203 acc += c;
204 }
205 }
206 if (any < 0) {
207 acc = neg ? LONG_MIN : LONG_MAX;
208 //rptr->_errno = ERANGE;
209 } else if (neg)
210 acc = -acc;
211 if (endptr != 0)
212 *endptr = (char *) (any ? (char *)s - 1 : nptr);
213 return (acc);
214 }
215
216 LIBC_ROM_TEXT_SECTION
217 _LONG_CALL_
218 long
_strtol(_CONST char * __restrict s,char ** __restrict ptr,int base)219 _strtol(_CONST char *__restrict s ,
220 char **__restrict ptr ,
221 int base)
222 {
223 return _strtol_r (s, ptr, base);
224 }
225