Mercurial > flash_v2
diff packages/language/c/libc/current/src/stdlib/strtol.cxx @ 0:3111d98ba7b3 ecos-v1_1-release
Initial commit of eCos version 1.1
| author | jlarmour |
|---|---|
| date | Tue, 11 May 1999 11:16:07 +0000 |
| parents | |
| children | 443894e2e912 |
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new file mode 100644 --- /dev/null +++ b/packages/language/c/libc/current/src/stdlib/strtol.cxx @@ -0,0 +1,208 @@ +//=========================================================================== +// +// strtol.cxx +// +// ANSI standard string to long int conversion function defined in +// section 7.10.1.5 of the standard +// +//=========================================================================== +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Cygnus eCos Public License +// Version 1.0 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://sourceware.cygnus.com/ecos +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Cygnus Operating System, released +// September 30, 1998. +// +// The Initial Developer of the Original Code is Cygnus. Portions created +// by Cygnus are Copyright (C) 1998 Cygnus Solutions. All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//=========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): jlarmour +// Contributors: jlarmour@cygnus.co.uk +// Date: 1998-02-13 +// Purpose: +// Description: +// Usage: +// +//####DESCRIPTIONEND#### +// +//=========================================================================== +// +// This code is based on original code with the following copyright: +// +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + + +// CONFIGURATION + +#include <pkgconf/libc.h> // Configuration header + +// Include the C library? +#ifdef CYGPKG_LIBC + +// INCLUDES + +#include <cyg/infra/cyg_type.h> // Common type definitions and support +#include <cyg/infra/cyg_trac.h> // Tracing support +#include <cyg/infra/cyg_ass.h> // Assertion support +#include <limits.h> // Definition of LONG_MIN and LONG_MAX +#include <ctype.h> // Definition of many ctype functions +#include <errno.h> // Error code definitions +#include <stdlib.h> // Header for all stdlib functions + // (like this one) +#include "clibincl/stdlibsupp.hxx" // Support for stdlib functions + + +// EXPORTED SYMBOLS + +externC long +strtol( const char *nptr, char **endptr, int base ) \ + CYGPRI_LIBC_WEAK_ALIAS("_strtol"); + +// FUNCTIONS + +// +// Convert a string to a long integer. +// +// Ignores `locale' stuff. Assumes that the upper and lower case +// alphabets and digits are each contiguous. +// + +long +_strtol( const char *nptr, char **endptr, int base ) +{ + const char *s = nptr; + unsigned long acc; + int c; + unsigned long cutoff; + int neg = 0, any, cutlim; + + CYG_REPORT_FUNCNAMETYPE( "_strtol", "returning long %d" ); + CYG_REPORT_FUNCARG3( "nptr=%08x, endptr=%08x, base=%d", + nptr, endptr, base ); + CYG_CHECK_DATA_PTR( nptr, "nptr is not a valid pointer!" ); + + if (endptr != NULL) + CYG_CHECK_DATA_PTR( endptr, "endptr is not a valid pointer!" ); + + // + // Skip white space and pick up leading +/- sign if any. + // If base is 0, allow 0x for hex and 0 for octal, else + // assume decimal; if base is already 16, allow 0x. + // + + do { + c = *s++; + } while (isspace(c)); + if (c == '-') { + neg = 1; + c = *s++; + } else if (c == '+') + c = *s++; + if ((base == 0 || base == 16) && + c == '0' && (*s == 'x' || *s == 'X')) { + c = s[1]; + s += 2; + base = 16; + } + if (base == 0) + base = c == '0' ? 8 : 10; + + // + // Compute the cutoff value between legal numbers and illegal + // numbers. That is the largest legal value, divided by the + // base. An input number that is greater than this value, if + // followed by a legal input character, is too big. One that + // is equal to this value may be valid or not; the limit + // between valid and invalid numbers is then based on the last + // digit. For instance, if the range for longs is + // [-2147483648..2147483647] and the input base is 10, + // cutoff will be set to 214748364 and cutlim to either + // 7 (neg==0) or 8 (neg==1), meaning that if we have accumulated + // a value > 214748364, or equal but the next digit is > 7 (or 8), + // the number is too big, and we will return a range error. + // + // Set any if any `digits' consumed; make it negative to indicate + // overflow. + // + + cutoff = neg ? -(unsigned long)LONG_MIN : LONG_MAX; + cutlim = cutoff % (unsigned long)base; + cutoff /= (unsigned long)base; + for (acc = 0, any = 0;; c = *s++) { + if (isdigit(c)) + c -= '0'; + else if (isalpha(c)) + c -= isupper(c) ? 'A' - 10 : 'a' - 10; + else + break; + if (c >= base) + break; + if (any < 0 || acc > cutoff || acc == cutoff && c > cutlim) + any = -1; + else { + any = 1; + acc *= base; + acc += c; + } + } + if (any < 0) { + acc = neg ? LONG_MIN : LONG_MAX; + errno = ERANGE; + } else if (neg) + acc = -acc; + if (endptr != 0) + *endptr = (char *) (any ? s - 1 : nptr); + + CYG_REPORT_RETVAL ( acc ); + + return acc; +} // _strtol() + +#endif // ifdef CYGPKG_LIBC + +// EOF strtol.cxx
