#include <stdio.h>

int main(int argc, char **argv)
{
    FILE *fp, *targetfp;
    char *target;
    int chr, i;

    if (argc < 3)
    {
        printf("%s <file1> <fileN...> <file to copy to>\n", argv[0]);
        puts("not enough args, quitting");
        return 1;
    }

    /* last argument is treated as target file name */
    target = argv[argc-1];
    targetfp = fopen(target, "a");

    for (i = 1; i < argc - 1; i++)
    {
        if ((fp = fopen(argv[i], "r")) == NULL)
        {
            printf("could not open file %s, quitting.", argv[i]);
            fflush(targetfp);
            fclose(targetfp);
            return 2;
        }

        while ((chr = fgetc(fp)) != EOF)
        {
            fputc(chr, targetfp);
        }

        fflush(targetfp);
        fclose(fp);
    }

    fclose(targetfp);

    return 0;
}