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Created string.h header; moved code to string.c

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This commit is contained in:
ngiddings
2021-04-10 20:15:23 -05:00
parent a57d841085
commit 6a4f777340
4 changed files with 125 additions and 221 deletions
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15
include/string.h Normal file
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#pragma once
#include <stddef.h>
void *memcpy(void *destination, const void *source, size_t num);
void *memmove(void *destination, const void *source, size_t num);
int memcmp(const void *ptr1, const void *ptr2, size_t num);
void *memset(void *ptr, int value, size_t num);
int strlen(const char *str);
char *strcpy(char *destination, const char *source);

110
src/string.c Normal file
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#include "string.h"
#include <stdbool.h>
#include <stdint.h>
void *memcpy(void *destination, const void *source, size_t num)
{
if (num > 0)
{
const uint8_t *src = (const uint8_t *)source;
uint8_t *dest = (uint8_t *)destination;
for (size_t i = 0; i < num; i++)
{
dest[i] = src[i];
}
}
return destination;
}
void *memmove(void *destination, const void *source, size_t num)
{
if (num > 0)
{
if (((size_t)destination) < ((size_t)source) || ((size_t)destination) >= (((size_t)source)) + num)
{
return memcpy(destination, source, num);
}
else if (destination != source)
{
size_t i = num - 1;
const uint8_t *src = (const uint8_t *)source;
uint8_t *dest = (uint8_t *)destination;
do
{
dest[i] = src[i];
i--;
} while (i != 0);
}
}
return destination;
}
int memcmp(const void *ptr1, const void *ptr2, size_t num)
{
const uint8_t *a = (const uint8_t *)ptr1;
const uint8_t *b = (const uint8_t *)ptr2;
for (size_t i = 0; i < num; i++)
{
if (a[i] < b[i])
return -1;
else if (a[i] > b[i])
return 1;
}
return 0;
}
void *memset(void *ptr, int value, size_t num)
{
uint8_t *dest = (uint8_t *)ptr;
uint8_t v = (uint8_t)value;
for (size_t i = 0; i < num; i++)
{
dest[i] = v;
}
return ptr;
}
int strlen(const char *str)
{
int i = 0;
while (str[i] != '\0')
{
i++;
}
return i;
}
char *strcpy(char *destination, const char *source)
{
int sourceLen = strlen(source);
if ((destination <= source) || (destination > (source + sourceLen)))
{
char *d = destination;
const char *s = source;
while (true)
{
*d = *s;
if (*s == '\0')
{
break;
}
else
{
s++;
d++;
}
}
}
else
{
char *d = destination + sourceLen;
const char *s = source + sourceLen;
do
{
*d = *s;
d--;
s--;
} while (d > destination);
}
return destination;
}

165
src/util.cpp
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@@ -1,165 +0,0 @@
#include <stdint.h>
#include "util.hpp"
#include "kernel.hpp"
void* memcpy(void* destination, const void* source, size_t num)
{
if(num > 0)
{
const uint8_t* src = (const uint8_t*) source;
uint8_t* dest = (uint8_t*) destination;
for(size_t i = 0; i < num; i++)
{
dest[i] = src[i];
}
}
return destination;
}
void* memmove(void* destination, const void* source, size_t num)
{
if(num > 0)
{
if(((size_t) destination) < ((size_t) source) || ((size_t) destination) >= (((size_t) source)) + num)
{
return memcpy(destination, source, num);
}
else if(destination != source)
{
size_t i = num - 1;
const uint8_t* src = (const uint8_t*) source;
uint8_t* dest = (uint8_t*) destination;
do
{
dest[i] = src[i];
i--;
} while(i != 0);
}
}
return destination;
}
int memcmp(const void* ptr1, const void* ptr2, size_t num)
{
const uint8_t* a = (const uint8_t*) ptr1;
const uint8_t* b = (const uint8_t*) ptr2;
for(size_t i = 0; i < num; i++)
{
if(a[i] < b[i])
return -1;
else if(a[i] > b[i])
return 1;
}
return 0;
}
void* memset(void* ptr, int value, size_t num)
{
uint8_t* dest = (uint8_t*) ptr;
uint8_t v = (uint8_t) value;
for(size_t i = 0; i < num; i++)
{
dest[i] = v;
}
return ptr;
}
int strlen(const char* str)
{
int i = 0;
while(str[i] != '\0')
{
i++;
}
return i;
}
char* strcpy(char* destination, const char* source)
{
int sourceLen = strlen(source);
if((destination <= source) || (destination > (source + sourceLen)))
{
char* d = destination;
const char* s = source;
while(true)
{
*d = *s;
if(*s == '\0')
{
break;
}
else
{
s++;
d++;
}
}
}
else
{
char* d = destination + sourceLen;
const char* s = source + sourceLen;
do
{
*d = *s;
d--;
s--;
} while(d > destination);
}
return destination;
}
void* malloc(size_t size)
{
return kernel.malloc(size);
}
void* calloc(size_t count, size_t size)
{
void* ptr = malloc(count * size);
if(ptr != nullptr)
memset(malloc(count * size), 0, count * size);
return ptr;
}
void* realloc(void* ptr, size_t size)
{
void* n = kernel.malloc(size);
if(n != nullptr)
{
memmove(n, ptr, size);
free(ptr);
}
return n;
}
void free(void* p)
{
kernel.free(p);
}
void __cxa_pure_virtual()
{
// do nothing
}
void* operator new(size_t size)
{
return malloc(size);
}
void* operator new[](size_t size)
{
return malloc(size);
}
void operator delete(void* p)
{
free(p);
}
void operator delete[](void* p)
{
free(p);
}

56
src/util.hpp
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@@ -1,56 +0,0 @@
#ifndef UTIL_H
#define UTIL_H
#include <stddef.h>
extern "C" void* memcpy(void* destination, const void* source, size_t num);
extern "C" void* memmove(void* destination, const void* source, size_t num);
extern "C" int memcmp(const void* ptr1, const void* ptr2, size_t num);
extern "C" void* memset(void* ptr, int value, size_t num);
extern "C" int strlen(const char* str);
extern "C" char* strcpy(char* destination, const char* source);
extern "C" void* malloc(size_t size);
extern "C" void* calloc(size_t count, size_t size);
extern "C" void* realloc(void* ptr, size_t size);
extern "C" void free(void* p);
extern "C" void __cxa_pure_virtual();
void* operator new(size_t size);
void* operator new[](size_t size);
void operator delete(void* p);
void operator delete[](void* p);
inline void* operator new(size_t, void *p)
{
return p;
}
inline void* operator new[](size_t, void *p)
{
return p;
}
inline void operator delete(void *, void *)
{
}
inline void operator delete[](void *, void *)
{
}
#endif