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96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013, 2014.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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stdlib/strtof.cpp
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Converts floating numbers represented as strings to binary representation.
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*******************************************************************************/
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#ifndef FLOAT
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#define FLOAT float
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#define STRTOF strtof
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#endif
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#include <stdlib.h>
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#include <stdio.h>
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// TODO: This horribly hacky code is taken from sdlquake's common.c, which is
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// licensed under the GPL. Since most Sortix software is GPL-compatible
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// this will do for now. It's a temporary measure until I get around to
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// writing a real strtod function - most of them are true horrors.
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#if !defined(__is_sortix_kernel)
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extern "C" FLOAT STRTOF(const char* str, char** nptr)
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{
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int sign = *str == '-' ? (str++, -1) : 1;
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FLOAT val = 0.0;
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if ( false )
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{
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out:
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if ( nptr )
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*nptr = (char*) str;
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return val * sign;
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}
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if ( str[0] == '0' && (str[1] == 'x' || str[1] == 'X') )
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{
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str += 2;
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while ( true )
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{
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char c = *str++;
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if ( '0' <= c && c <= '9' )
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val = val * 16 + c - '0';
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else if ( 'a' <= c && c <= 'f' )
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val = val * 16 + c - 'a' + 10;
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else if ( 'A' <= c && c <= 'F' )
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val = val * 16 + c - 'A' + 10;
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else
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goto out;
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}
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}
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int decimal = -1;
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int total = 0;
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while ( true )
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{
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char c = *str++;
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if (c == '.')
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{
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decimal = total;
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continue;
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}
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if ( c < '0' || c > '9' )
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break;
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val = val * 10 + c - '0';
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total++;
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}
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if ( decimal == -1 )
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goto out;
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while ( decimal < total )
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{
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val /= 10;
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total--;
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}
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goto out;
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}
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#endif
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