author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 02:01:42 +0200 | |
changeset 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies). |
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// All rights reserved. |
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// This component and the accompanying materials are made available |
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// under the terms of "Eclipse Public License v1.0" |
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// which accompanies this distribution, and is available |
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// at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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// |
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// Initial Contributors: |
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// Nokia Corporation - initial contribution. |
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// |
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// Contributors: |
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// |
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// Description: |
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// FUNCTION |
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// <<atof>>, <<atoff>>---string to double or float |
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// INDEX |
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// atof |
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// INDEX |
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// atoff |
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// ANSI_SYNOPSIS |
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// |
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|
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// #include <stdlib.h> |
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// double atof(const char *<[s]>); |
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// float atoff(const char *<[s]>); |
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// TRAD_SYNOPSIS |
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// #include <stdlib.h> |
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// double atof(<[s]>) |
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// char *<[s]>; |
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// float atoff(<[s]>) |
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// char *<[s]>; |
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// <<atof>> converts the initial portion of a string to a <<double>>. |
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// <<atoff>> converts the initial portion of a string to a <<float>>. |
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// The functions parse the character string <[s]>, |
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// locating a substring which can be converted to a floating point |
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// value. The substring must match the format: |
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// . [+|-]<[digits]>[.][<[digits]>][(e|E)[+|-]<[digits]>] |
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// The substring converted is the longest initial |
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// fragment of <[s]> that has the expected format, beginning with |
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// the first non-whitespace character. The substring |
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// is empty if <<str>> is empty, consists entirely |
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// of whitespace, or if the first non-whitespace character is |
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// something other than <<+>>, <<->>, <<.>>, or a digit. |
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// <<atof(<[s]>)>> is implemented as <<strtod(<[s]>, NULL)>>. |
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// <<atoff(<[s]>)>> is implemented as <<strtodf(<[s]>, NULL)>>. |
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// RETURNS |
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// <<atof>> returns the converted substring value, if any, as a |
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// <<double>>; or <<0.0>>, if no conversion could be performed. |
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// If the correct value is out of the range of representable values, plus |
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// or minus <<HUGE_VAL>> is returned, and <<ERANGE>> is stored in |
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// <<errno>>. |
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// If the correct value would cause underflow, <<0.0>> is returned |
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// and <<ERANGE>> is stored in <<errno>>. |
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// <<atoff>> obeys the same rules as <<atof>>, except that it |
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// returns a <<float>>. |
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// PORTABILITY |
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// <<atof>> is ANSI C. <<atof>>, <<atoi>>, and <<atol>> are subsumed by <<strtod>> |
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// and <<strtol>>, but are used extensively in existing code. These functions are |
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// less reliable, but may be faster if the argument is verified to be in a valid |
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// range. |
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// Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>, |
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// <<lseek>>, <<read>>, <<sbrk>>, <<write>>. |
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// |
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|
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#include <e32std.h> |
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#include <stdlib.h> |
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#include <errno.h> |
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#include <math.h> |
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#include "../INC/ESTLIB.H" |
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extern "C" { |
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|
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/** |
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Convert string to double-precision floating-point value. |
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Parses string interpreting its content as a floating-point value |
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until a character that can not be interpreted is found, |
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and returns a double precision value. |
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@return The converted double value from the input string. |
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If an error occurs 0 is returned. |
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@param s String representing a floating point number. |
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@param tail Address of a pointer. |
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This is filled by the function with the address where scan has ended. |
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Serves to determine where there is the first non-numerical character in the string. |
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*/ |
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EXPORT_C double strtod (const char *s, char** tail) __SOFTFP |
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{ |
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TLex8 data=(unsigned char *)s; |
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TReal64 ret=0.0; |
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data.SkipSpace(); |
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TBool minus = data.Peek() == '-'; |
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TInt r=data.Val(ret); |
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if (r==KErrOverflow) |
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{ |
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errno=ERANGE; |
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if (minus) |
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ret = -HUGE_VAL; |
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else |
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ret = HUGE_VAL; |
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} |
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else if (r==KErrUnderflow) |
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errno=ERANGE; |
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if (tail) |
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*tail=(char*)(s+data.Offset()); |
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return ret; |
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104 |
} |
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105 |
|
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106 |
/** |
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107 |
Convert string to double. |
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Parses string interpreting its content as a floating point number |
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and returns a value of type double. |
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@return The converted floating point value of the input string. |
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On overflow the result is undefined. |
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If an error occurs 0.0 is returned. |
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@param s String representing a floating point number. |
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114 |
*/ |
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EXPORT_C double atof (const char *s) __SOFTFP |
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116 |
{ |
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return strtod(s,NULL); |
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118 |
} |
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119 |
|
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} // extern "C" |