source: MondoRescue/branches/2.2.9/mindi-busybox/libbb/full_write.c@ 2725

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
 */

#include "libbb.h"

/*
 * Write all of the supplied buffer out to a file.
 * This does multiple writes as necessary.
 * Returns the amount written, or -1 on an error.
 */
ssize_t FAST_FUNC full_write(int fd, const void *buf, size_t len)
{
    ssize_t cc;
    ssize_t total;

    total = 0;

    while (len) {
        cc = safe_write(fd, buf, len);

        if (cc < 0) {
            if (total) {
                /* we already wrote some! */
                /* user can do another write to know the error code */
                return total;
            }
            return cc;  /* write() returns -1 on failure. */
        }

        total += cc;
        buf = ((const char *)buf) + cc;
        len -= cc;
    }

    return total;
}