OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [libiberty/] [strtol.c] - Blame information for rev 828

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 227 jeremybenn
/*-
2
 * Copyright (c) 1990 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 [rescinded 22 July 1999]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 int} strtol (const char *@var{string}, char **@var{endptr}, int @var{base})
34
@deftypefnx Supplemental {unsigned long int} strtoul (const char *@var{string}, char **@var{endptr}, int @var{base})
35
 
36
The @code{strtol} function converts the string in @var{string} to a
37
long integer value according to the given @var{base}, which must be
38
between 2 and 36 inclusive, or be the special value 0.  If @var{base}
39
is 0, @code{strtol} will look for the prefixes @code{0} and @code{0x}
40
to indicate bases 8 and 16, respectively, else default to base 10.
41
When the base is 16 (either explicitly or implicitly), a prefix of
42
@code{0x} is allowed.  The handling of @var{endptr} is as that of
43
@code{strtod} above.  The @code{strtoul} function is the same, except
44
that the converted value is unsigned.
45
 
46
@end deftypefn
47
 
48
*/
49
 
50
#ifdef HAVE_CONFIG_H
51
#include "config.h"
52
#endif
53
#ifdef HAVE_LIMITS_H
54
#include <limits.h>
55
#endif
56
#ifdef HAVE_SYS_PARAM_H
57
#include <sys/param.h>
58
#endif
59
#include <errno.h>
60
#ifdef NEED_DECLARATION_ERRNO
61
extern int errno;
62
#endif
63
#include "safe-ctype.h"
64
 
65
/* FIXME: It'd be nice to configure around these, but the include files are too
66
   painful.  These macros should at least be more portable than hardwired hex
67
   constants. */
68
 
69
#ifndef ULONG_MAX
70
#define ULONG_MAX       ((unsigned long)(~0L))          /* 0xFFFFFFFF */
71
#endif
72
 
73
#ifndef LONG_MAX
74
#define LONG_MAX        ((long)(ULONG_MAX >> 1))        /* 0x7FFFFFFF */
75
#endif
76
 
77
#ifndef LONG_MIN
78
#define LONG_MIN        ((long)(~LONG_MAX))             /* 0x80000000 */
79
#endif
80
 
81
/*
82
 * Convert a string to a long integer.
83
 *
84
 * Ignores `locale' stuff.  Assumes that the upper and lower case
85
 * alphabets and digits are each contiguous.
86
 */
87
long
88
strtol(const char *nptr, char **endptr, register int base)
89
{
90
        register const char *s = nptr;
91
        register unsigned long acc;
92
        register int c;
93
        register unsigned long cutoff;
94
        register int neg = 0, any, cutlim;
95
 
96
        /*
97
         * Skip white space and pick up leading +/- sign if any.
98
         * If base is 0, allow 0x for hex and 0 for octal, else
99
         * assume decimal; if base is already 16, allow 0x.
100
         */
101
        do {
102
                c = *s++;
103
        } while (ISSPACE(c));
104
        if (c == '-') {
105
                neg = 1;
106
                c = *s++;
107
        } else if (c == '+')
108
                c = *s++;
109
        if ((base == 0 || base == 16) &&
110
            c == '0' && (*s == 'x' || *s == 'X')) {
111
                c = s[1];
112
                s += 2;
113
                base = 16;
114
        }
115
        if (base == 0)
116
                base = c == '0' ? 8 : 10;
117
 
118
        /*
119
         * Compute the cutoff value between legal numbers and illegal
120
         * numbers.  That is the largest legal value, divided by the
121
         * base.  An input number that is greater than this value, if
122
         * followed by a legal input character, is too big.  One that
123
         * is equal to this value may be valid or not; the limit
124
         * between valid and invalid numbers is then based on the last
125
         * digit.  For instance, if the range for longs is
126
         * [-2147483648..2147483647] and the input base is 10,
127
         * cutoff will be set to 214748364 and cutlim to either
128
         * 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
129
         * a value > 214748364, or equal but the next digit is > 7 (or 8),
130
         * the number is too big, and we will return a range error.
131
         *
132
         * Set any if any `digits' consumed; make it negative to indicate
133
         * overflow.
134
         */
135
        cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
136
        cutlim = cutoff % (unsigned long)base;
137
        cutoff /= (unsigned long)base;
138
        for (acc = 0, any = 0;; c = *s++) {
139
                if (ISDIGIT(c))
140
                        c -= '0';
141
                else if (ISALPHA(c))
142
                        c -= ISUPPER(c) ? 'A' - 10 : 'a' - 10;
143
                else
144
                        break;
145
                if (c >= base)
146
                        break;
147
                if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
148
                        any = -1;
149
                else {
150
                        any = 1;
151
                        acc *= base;
152
                        acc += c;
153
                }
154
        }
155
        if (any < 0) {
156
                acc = neg ? LONG_MIN : LONG_MAX;
157
                errno = ERANGE;
158
        } else if (neg)
159
                acc = -acc;
160
        if (endptr != 0)
161
                *endptr = (char *) (any ? s - 1 : nptr);
162
        return (acc);
163
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.