Junção de dois ficheiros de texto

// Apple Xcode


#include <stdio.h>
#include <stdlib.h>

#ifdef BYTE
#undef BYTE
#endif

#define BYTE unsigned char

int main (int argc, const char * argv[])
{
    // insert content from file 2 into the file 1
    char *the_file_name_1 = "/Users/.../Desktop/bkpf_01.txt";
    char *the_file_name_2 = "/Users/.../Desktop/bkpf_02.txt";

    BYTE *the_buffer_2;
    long the_size;
    FILE *the_file_1, *the_file_2;

    // open file-1 for update, file-2 for read
    the_file_1 = fopen(the_file_name_1, "a+");
    the_file_2 = fopen(the_file_name_2, "rb");

    if (the_file_1 == NULL)
    {
        perror("erro na abertura do ficheiro 1");
        return EXIT_FAILURE;
    }

    if (the_file_2 == NULL)
    {
        perror("erro na abertura do ficheiro 2");
        return EXIT_FAILURE;
    }

    // get size of file-2
    fseek(the_file_2, 0, SEEK_END);
    the_size = ftell(the_file_2);
    rewind(the_file_2);

    // allocate buffer, read-in file-2
    the_buffer_2 = (BYTE *)malloc((size_t)the_size);
    fread(the_buffer_2, the_size, 1, the_file_2);

    // write the buffer to (end of) file-1
    fwrite(the_buffer_2, the_size, 1, the_file_1);

    // clean-up and close
    free(the_buffer_2);
    fclose(the_file_1);
    fclose(the_file_2);

    return 0;
}