100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
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// Projectname: SWEB
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// Simple operating system for educational purposes
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//
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// Copyright (C) 2005 Andreas Niederl
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#pragma once
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#include "types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* NULL pointer constant
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*
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*/
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#define NULL 0
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/**
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* Compares the given number of bytes of the memory areas started by the
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* given pointers.
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* The return value will be an integer less than zero, if the bytes at the
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* first area are less than those of the second. It will be zero for equality,
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* and a value greater zero if the bytes at the first area are greater than
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* those of the second
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*
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* @param first_position Position of the first memory area
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* @param second_position Position of the second memory area
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* @param number_of_bytes Number of bytes to compare
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* @return An integer indicating the found differences
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*
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*/
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extern int memcmp(const void *first_position, const void *second_position,
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size_t number_of_bytes);
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/**
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* Copies the given number of bytes from memory area source to memory area
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* destination. The memory areas should not overlap.
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*
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* @param destination Destination memory position
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* @param source Source memory position
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* @param number_of_bytes Number of bytes to copy
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* @return A pointer to the destination
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*
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*/
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extern void* memcpy(void *destination, const void *source,
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size_t number_of_bytes);
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/**
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* Fills the given number of bytes of the memory area pointed to by the given
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* position with the given value.
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*
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* @param position Position of the memory area
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* @param value Value to write
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* @param number_of_bytes Number of bytes to write
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* @return A pointer to the memory area
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*
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*/
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extern void *memset(void *position, int value, size_t number_of_bytes);
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/**
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* Gets the length of the null terminated string
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*
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* @param str String
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* @return length of String
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*/
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extern size_t strlen(const char* str);
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/**
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* Compares the 2 Strings, default implementation
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*/
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extern int strcmp (const char * l, const char * r);
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/**
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* searches for needle in haystack
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*/
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extern char *strstr(const char *haystack, const char *needle);
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#ifdef __cplusplus
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}
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#endif
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