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_Read.c
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_Read.c
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/*++
toro C Library
https://github.com/KilianKegel/toro-C-Library#toro-c-library-formerly-known-as-torito-c-library
Copyright (c) 2017-2024, Kilian Kegel. All rights reserved.
SPDX-License-Identifier: GNU General Public License v3.0
Module Name:
_Read.c
Abstract:
Implementation of the POSIX C function.
Reads data from a file.
Author:
Kilian Kegel
--*/
#include <stdio.h>
#include <limits.h>
#include <CdeServices.h>
extern void (*pinvalid_parameter_handler)(const wchar_t* expression, const wchar_t* function, const wchar_t* file, unsigned int line, unsigned* pReserved);
extern void* __cdeGetIOBuffer(unsigned i);
/** close
Synopsis
#include <io.h>
int _read(int const fd, void * const buffer, unsigned const buffer_size);
Description
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/read?view=msvc-170
https://pubs.opengroup.org/onlinepubs/9699919799/functions/read.html
Parameters
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/read?view=msvc-170#parameters
Returns
https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/read?view=msvc-170#return-value
**/
int _read(int const fd, void* const buffer, unsigned const buffer_size)
{
FILE* fp = __cdeGetIOBuffer((unsigned)fd);
int nRet = NULL == fp ? -1 : 0;
if (NULL != fp) do {
//TODO check if (NULL == stream)
//TODO check (*pinvalid_parameter_handler)(NULL, NULL, NULL, 0, 0);
if (NULL == buffer || buffer_size > INT_MAX)
{
//(*pinvalid_parameter_handler)(L"\"NULL == buffer || count > INT_MAX\"", __CDEWCSFUNCTION__, __CDEWCSFILE__, __LINE__, 0);
(*pinvalid_parameter_handler)(NULL, NULL, NULL, 0, 0);
break;
}
nRet = (int)fread(buffer, 1, buffer_size, fp);
} while (0);
return nRet;
}