banan-os/libc/stdlib.cpp

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#include <BAN/Assert.h>
#include <ctype.h>
#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
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extern "C" void _fini();
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void abort(void)
{
ASSERT_NOT_REACHED();
}
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void exit(int status)
{
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fflush(nullptr);
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_fini();
_exit(status);
ASSERT_NOT_REACHED();
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}
int abs(int val)
{
return val < 0 ? -val : val;
}
int atexit(void(*)(void))
{
return -1;
}
int atoi(const char* str)
{
while (isspace(*str))
str++;
bool negative = (*str == '-');
if (*str == '-' || *str == '+')
str++;
int res = 0;
while (isdigit(*str))
{
res = (res * 10) + (*str - '0');
str++;
}
return negative ? -res : res;
}
char* getenv(const char*)
{
return nullptr;
}
void* malloc(size_t bytes)
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{
long res = syscall(SYS_ALLOC, bytes);
if (res == -1)
return nullptr;
return (void*)res;
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}
void* calloc(size_t nmemb, size_t size)
{
if (nmemb * size < nmemb)
return nullptr;
void* ptr = malloc(nmemb * size);
if (ptr == nullptr)
return nullptr;
memset(ptr, 0, nmemb * size);
return ptr;
}
void free(void* ptr)
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{
if (ptr == nullptr)
return;
syscall(SYS_FREE, ptr);
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}