79 lines
2.4 KiB
C
79 lines
2.4 KiB
C
/*
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* |-----------------------------------------------------------|
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* | Copyright (c) 1991, 1990 MIPS Computer Systems, Inc. |
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* | All Rights Reserved |
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* |-----------------------------------------------------------|
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* | Restricted Rights Legend |
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* | Use, duplication, or disclosure by the Government is |
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* | subject to restrictions as set forth in |
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* | subparagraph (c)(1)(ii) of the Rights in Technical |
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* | Data and Computer Software Clause of DFARS 252.227-7013. |
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* | MIPS Computer Systems, Inc. |
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* | 950 DeGuigne Avenue |
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* | Sunnyvale, California 94088-3650, USA |
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* |-----------------------------------------------------------|
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*/
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#ident "$Header: /proj/irix6.5.7m/isms/eoe/cmd/cpio/RCS/g_read.c,v 1.4 1995/10/03 03:05:27 ack Exp $"
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/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
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/* All Rights Reserved */
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/* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T */
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/* The copyright notice above does not evidence any */
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/* actual or intended publication of such source code. */
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#include <errno.h>
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#include <sys/stat.h>
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#include "libgenIO.h"
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#include "rmt.h"
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/*
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* g_read: Read nbytes of data from fdes (of type devtype) and place
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* data in location pointed to by buf. In case of end of medium,
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* translate (where necessary) device specific EOM indications into
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* the generic EOM indication of rv = -1, errno = ENOSPC.
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*/
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int
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g_read(int devtype, int fdes, char *buf, unsigned nbytes)
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{
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int rv;
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if (devtype < 0 || devtype >= G_DEV_MAX) {
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errno = ENODEV;
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return(-1);
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}
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if ((rv = rmtread(fdes, buf, nbytes)) <= 0) {
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switch (devtype) {
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case G_FILE: /* do not change returns for files */
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break;
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case G_NO_DEV:
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if(!rv) {
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/* this indicates end-of-media with
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* many devices */
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rv = -1;
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errno = ENOSPC;
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}
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/* else leave errno alone */
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break;
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case G_TAPE:
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/* cpio expects that multivolume is
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* is denoted by reading an ENOSPC at the
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* end of the tape, but the driver has
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* been changed to create a FM so we have
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* to fake it here.
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*/
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if (!rv) {
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rv = -1;
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errno = ENOSPC;
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}
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break;
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default:
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rv = -1;
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errno = ENODEV;
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} /* devtype */
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} /* (rv = read(fdes, buf, nbytes)) <= 0 */
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return(rv);
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}
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