mirror of
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- Added strtof(), llabs(), lldiv(), vsscanf() and vscanf() for C99.
- strftime() now supports %C, %n, %r, %R, %t, %T, %u, %V, and %z for C99. git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@14930 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
323
library/stdlib_strtof.c
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323
library/stdlib_strtof.c
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/*
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* $Id: stdlib_strtof.c,v 1.1 2005-05-07 13:21:49 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _STDLIB_NULL_POINTER_CHECK_H
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#include "stdlib_null_pointer_check.h"
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#endif /* _STDLIB_NULL_POINTER_CHECK_H */
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/****************************************************************************/
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#ifndef _STDLIB_HEADERS_H
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#include "stdlib_headers.h"
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#endif /* _STDLIB_HEADERS_H */
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#ifndef _LOCALE_HEADERS_H
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#include "locale_headers.h"
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#endif /* _LOCALE_HEADERS_H */
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/****************************************************************************/
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#ifndef _MATH_FP_SUPPORT_H
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#include "math_fp_support.h"
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#endif /* _MATH_FP_SUPPORT_H */
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/****************************************************************************/
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#if defined(FLOATING_POINT_SUPPORT)
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/****************************************************************************/
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#ifndef _MATH_HEADERS_H
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#include "math_headers.h"
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#endif /* _MATH_HEADERS_H */
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/****************************************************************************/
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float
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strtof(const char *str, char ** ptr)
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{
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float sum = 0.0;
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float new_sum;
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float result;
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int decimal_point_matches;
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int is_negative;
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int error = 0;
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char c;
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ENTER();
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SHOWSTRING(str);
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SHOWPOINTER(ptr);
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assert( str != NULL );
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#if defined(CHECK_FOR_NULL_POINTERS)
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{
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if(str == NULL)
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{
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SHOWMSG("invalid str parameter");
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__set_errno(EFAULT);
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result = __get_huge_val();
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goto out;
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}
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}
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#endif /* CHECK_FOR_NULL_POINTERS */
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/* Skip all leading blanks. */
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while((c = (*str)) != '\0')
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{
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if(NOT isspace(c))
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break;
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str++;
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}
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/* The first character may be a sign. */
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if((*str) == '-')
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{
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/* It's a negative number. */
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is_negative = 1;
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str++;
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}
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else
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{
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/* It's not going to be negative. */
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is_negative = 0;
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/* But there may be a sign we will choose to
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* ignore.
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*/
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if((*str) == '+')
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str++;
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}
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/* We begin by trying to convert all the digits
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* preceding the decimal point.
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*/
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while((c = (*str)) != '\0')
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{
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if('0' <= c && c <= '9')
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{
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str++;
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if(error == 0)
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{
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new_sum = (10 * sum) + (c - '0');
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if(new_sum < sum) /* overflow? */
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error = ERANGE;
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else
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sum = new_sum;
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}
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}
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else
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{
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break;
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}
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}
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/* Did we find the decimal point? We accept both the
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* locale configured decimal point and the plain old
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* dot.
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*/
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decimal_point_matches = 0;
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__locale_lock();
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if(__locale_table[LC_NUMERIC] != NULL)
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{
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char * point;
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point = (char *)__locale_table[LC_NUMERIC]->loc_DecimalPoint;
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if((*point) == (*str))
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{
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decimal_point_matches = 1;
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/* Skip the decimal point. */
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str++;
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}
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}
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__locale_unlock();
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if(NOT decimal_point_matches)
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{
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if((*str) == '.')
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{
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decimal_point_matches = 1;
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/* Skip the decimal point. */
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str++;
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}
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}
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if(decimal_point_matches)
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{
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float divisor = 0.1;
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/* Process all digits following the decimal point. */
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while((c = (*str)) != '\0')
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{
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if('0' <= c && c <= '9')
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{
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str++;
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if(error == 0 && divisor != 0.0)
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{
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new_sum = sum + (c - '0') * divisor;
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if(new_sum < sum) /* overflow? */
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error = ERANGE;
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else
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sum = new_sum;
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divisor = divisor / 10.0;
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}
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}
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else
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{
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break;
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}
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}
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}
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/* If there is a scale indicator attached, process it. */
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if((*str) == 'e' || (*str) == 'E')
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{
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int exponent_is_negative;
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int new_exponent;
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int exponent = 0;
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/* Skip the indicator. */
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str++;
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/* Take care of the exponent's sign. */
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if((*str) == '-')
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{
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exponent_is_negative = 1;
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str++;
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}
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else
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{
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exponent_is_negative = 0;
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if((*str) == '+')
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str++;
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}
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/* Again, process all digits to follow. */
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while((c = (*str)) != '\0')
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{
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if('0' <= c && c <= '9')
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{
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str++;
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if(error == 0)
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{
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new_exponent = (10 * exponent) + (c - '0');
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if(new_exponent < exponent) /* overflow? */
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error = ERANGE;
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else
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exponent = new_exponent;
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}
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}
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else
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{
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break;
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}
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}
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/* If the exponent is valid, scale the number
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* accordingly.
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*/
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if(exponent != 0)
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{
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if(exponent_is_negative)
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{
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float divisor;
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/* A negative exponent means division. */
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divisor = pow(10.0,(float)exponent);
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if(divisor != 0.0)
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{
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new_sum = sum / divisor;
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if(new_sum == 0.0 && sum != 0.0)
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error = ERANGE;
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else
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sum = new_sum;
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}
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else
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{
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error = ERANGE;
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}
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}
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else
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{
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/* A positive exponent means multiplication. */
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new_sum = sum * pow(10.0,(float)exponent);
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if(new_sum < sum)
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error = ERANGE;
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else
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sum = new_sum;
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}
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}
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}
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if(error != 0)
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{
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__set_errno(error);
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sum = __get_huge_val();
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}
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if(is_negative)
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sum = (-sum);
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result = sum;
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/* If desired, remember where we stopped reading the
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* number from the buffer.
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*/
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if(ptr != NULL)
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(*ptr) = (char *)str;
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out:
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RETURN(result);
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return(result);
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}
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/****************************************************************************/
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#endif /* FLOATING_POINT_SUPPORT */
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