cfn.c


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#include "cat.h"

/* Function opens and writes the contents of a named file to stdout;
 * effectively a wrapper around cfd() */
int cfn(const char *fn, void *buf) {
    int fd;

    /* Open the file to get a read-only file descriptor */
    if ((fd = open(fn, O_RDONLY)) == -1) {
        perror(__FUNCTION__);
        return -1;
    }

    /* Pass the opened descriptor to cfd() to read it; we keep going even if
     * there are problems, because we need the descriptor closed even if we
     * couldn't read it */
    cfd(fd, buf);

    /* Close the descriptor, since we should now be done with it */
    if (close(fd) == -1) {
        perror(__FUNCTION__);
        return -1;
    }
}