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https://gitlab.com/sortix/sortix.git
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99 lines
2.6 KiB
C++
99 lines
2.6 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 STRTOF
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#define STRTOF_FLOAT float
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#define STRTOF strtof
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#define STRTOF_CHAR char
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#define STRTOF_L(x) x
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#endif
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#include <stdlib.h>
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#include <wchar.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" STRTOF_FLOAT STRTOF(const STRTOF_CHAR* str, STRTOF_CHAR** nptr)
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{
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int sign = *str == STRTOF_L('-') ? (str++, -1) : 1;
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STRTOF_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 = (STRTOF_CHAR*) str;
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return val * sign;
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}
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if ( str[0] == STRTOF_L('0') &&
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(str[1] == STRTOF_L('x') || str[1] == STRTOF_L('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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STRTOF_CHAR c = *str++;
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if ( STRTOF_L('0') <= c && c <= STRTOF_L('9') )
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val = val * 16 + c - STRTOF_L('0');
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else if ( STRTOF_L('a') <= c && c <= STRTOF_L('f') )
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val = val * 16 + c - STRTOF_L('a') + 10;
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else if ( STRTOF_L('A') <= c && c <= STRTOF_L('F') )
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val = val * 16 + c - STRTOF_L('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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STRTOF_CHAR c = *str++;
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if ( c == STRTOF_L('.') )
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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 < STRTOF_L('0') || c > STRTOF_L('9') )
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break;
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val = val * 10 + c - STRTOF_L('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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