parse_utils.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef HARVESTER_PARSE_UTILS_H
#define HARVESTER_PARSE_UTILS_H
 
#include <climits>
 
#include "common/str.h"
#include "common/util.h"
 
namespace Harvester {
 
// Mirrors atoi's permissive decimal parsing while relying on Common helpers.
inline int parseAsciiIntOrZero(const Common::String &value) {
    uint start = 0;
    while (start < value.size() && Common::isSpace((byte)value[start]))
        ++start;
 
    bool negative = false;
    if (start < value.size() && (value[start] == '+' || value[start] == '-')) {
        negative = value[start] == '-';
        ++start;
    }
 
    uint end = start;
    while (end < value.size() && Common::isDigit((byte)value[end]))
        ++end;
 
    if (start == end)
        return 0;
 
    const uint64 magnitude = value.substr(start, end - start).asUint64();
    if (negative) {
        if (magnitude > (uint64)INT_MAX + 1)
            return INT_MIN;
        return -(int)magnitude;
    }
 
    if (magnitude > (uint64)INT_MAX)
        return INT_MAX;
    return (int)magnitude;
}
 
} // End of namespace Harvester
 
#endif