fstat / malloc / fopen / fread / fclose / free

read_file_to_buffer.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <expat.h>
#include <memory.h>

int main(int argc, char *argv[])
{
    char*       szTestFile = "C:/test.txt";
    FILE*       pFile;
    struct stat sFileStatus;
    int         nStatus;
    int         nBufferSize;
    char*       pBuffer;
    int         nReturnValue = 0;

    memset(&sFileStatus, 0x0, sizeof(struct stat));

    // Status the file size.
    if (0 != (nStatus = stat(szTestFile, &sFileStatus)))
    {
        fprintf(stderr, "stat() failed on file: '%s.  Error Code: %d\n",
                szTestFile, nStatus);
        nReturnValue = -1;
    }

    // Set the buffer size, Allocate the buffer.
    else if(0 == (pBuffer = (char*)malloc(nBufferSize = sFileStatus.st_size)))
    {
        fprintf(stderr, "buffer allocation failed.\n",
                szTestFile);
        nReturnValue = -1;
    }

    // Open the file.
    else if(0 == (pFile = fopen(szTestFile, "rb")))
    {
        fprintf(stderr, "fopen() failed on file: '%s.\n",
                szTestFile);
        nReturnValue = -1;
    }

    // Read the buffer
    else if(nBufferSize != (nStatus = fread(pBuffer,1,nBufferSize,pFile)))
    {
        fprintf(stderr, "fread() failed to read size reported by stat().\n");
        nReturnValue = -1;
    }

    // Close the file.
    if((pFile != 0) && (0 != (nStatus = fclose(pFile))))
    {
        fprintf(stderr, "fclose() failed on file: '%s.\n",
                szTestFile);
        nReturnValue = -1;
    }

    // Free the buffer.
    free (pBuffer);

    system("pause");
    return nReturnValue;
}