1 //===========================================================================
5 // ISO standard string to long int conversion function defined in
6 // section 7.10.1.5 of the standard
8 //===========================================================================
9 //####ECOSGPLCOPYRIGHTBEGIN####
10 // -------------------------------------------
11 // This file is part of eCos, the Embedded Configurable Operating System.
12 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
14 // eCos is free software; you can redistribute it and/or modify it under
15 // the terms of the GNU General Public License as published by the Free
16 // Software Foundation; either version 2 or (at your option) any later version.
18 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
19 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
23 // You should have received a copy of the GNU General Public License along
24 // with eCos; if not, write to the Free Software Foundation, Inc.,
25 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
27 // As a special exception, if other files instantiate templates or use macros
28 // or inline functions from this file, or you compile this file and link it
29 // with other works to produce a work based on this file, this file does not
30 // by itself cause the resulting work to be covered by the GNU General Public
31 // License. However the source code for this file must still be made available
32 // in accordance with section (3) of the GNU General Public License.
34 // This exception does not invalidate any other reasons why a work based on
35 // this file might be covered by the GNU General Public License.
37 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
38 // at http://sources.redhat.com/ecos/ecos-license/
39 // -------------------------------------------
40 //####ECOSGPLCOPYRIGHTEND####
41 //===========================================================================
42 //#####DESCRIPTIONBEGIN####
44 // Author(s): jlarmour
51 //####DESCRIPTIONEND####
53 //===========================================================================
55 // This code is based on original code with the following copyright:
58 * Copyright (c) 1990 The Regents of the University of California.
59 * All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
64 * 1. Redistributions of source code must retain the above copyright
65 * notice, this list of conditions and the following disclaimer.
66 * 2. Redistributions in binary form must reproduce the above copyright
67 * notice, this list of conditions and the following disclaimer in the
68 * documentation and/or other materials provided with the distribution.
69 * 3. Neither the name of the University nor the names of its contributors
70 * may be used to endorse or promote products derived from this software
71 * without specific prior written permission.
73 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
74 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
75 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
76 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
77 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
78 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
79 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
80 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
81 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
82 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
89 #include <pkgconf/libc_stdlib.h> // Configuration header
93 #include <cyg/infra/cyg_type.h> // Common type definitions and support
94 #include <cyg/infra/cyg_trac.h> // Tracing support
95 #include <cyg/infra/cyg_ass.h> // Assertion support
96 #include <limits.h> // Definition of LONG_MIN and LONG_MAX
97 #include <ctype.h> // Definition of many ctype functions
98 #include <errno.h> // Error code definitions
99 #include <stdlib.h> // Header for all stdlib functions
106 // Convert a string to a long integer.
108 // Ignores `locale' stuff. Assumes that the upper and lower case
109 // alphabets and digits are each contiguous.
113 strtol( const char *nptr, char **endptr, int base )
115 const char *s = nptr;
118 unsigned long cutoff;
119 int neg = 0, any, cutlim;
121 CYG_REPORT_FUNCNAMETYPE( "strtol", "returning long %d" );
122 CYG_REPORT_FUNCARG3( "nptr=%08x, endptr=%08x, base=%d",
123 nptr, endptr, base );
124 CYG_CHECK_DATA_PTR( nptr, "nptr is not a valid pointer!" );
127 CYG_CHECK_DATA_PTR( endptr, "endptr is not a valid pointer!" );
130 // Skip white space and pick up leading +/- sign if any.
131 // If base is 0, allow 0x for hex and 0 for octal, else
132 // assume decimal; if base is already 16, allow 0x.
137 } while (isspace(c));
143 if ((base == 0 || base == 16) &&
144 c == '0' && (*s == 'x' || *s == 'X')) {
150 base = c == '0' ? 8 : 10;
153 // Compute the cutoff value between legal numbers and illegal
154 // numbers. That is the largest legal value, divided by the
155 // base. An input number that is greater than this value, if
156 // followed by a legal input character, is too big. One that
157 // is equal to this value may be valid or not; the limit
158 // between valid and invalid numbers is then based on the last
159 // digit. For instance, if the range for longs is
160 // [-2147483648..2147483647] and the input base is 10,
161 // cutoff will be set to 214748364 and cutlim to either
162 // 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated
163 // a value > 214748364, or equal but the next digit is > 7 (or 8),
164 // the number is too big, and we will return a range error.
166 // Set any if any `digits' consumed; make it negative to indicate
170 cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX;
171 cutlim = cutoff % (unsigned long)base;
172 cutoff /= (unsigned long)base;
173 for (acc = 0, any = 0;; c = *s++) {
177 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
182 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
191 acc = neg ? LONG_MIN : LONG_MAX;
196 *endptr = (char *) (any ? s - 1 : nptr);
198 CYG_REPORT_RETVAL ( acc );