coreutils/src/dd.c, branch v7.1

doc: dd: document that the default block size is 512 bytes

2009-02-19T11:45:18Z

* src/dd.c (usage): Document the default block size. * doc/coreutils.texi (dd invocation): Document that the default block size (bs, ibs, obs) is 512 bytes. Reported by Petr Uzel.

update copyright dates from recent changes

2009-02-02T08:37:48Z

* src/dd.c: Add 2009 to list of copyright years. * tests/dd/seek-skip-past-file: Likewise. * tests/dd/seek-skip-past-dev: Likewise. * m4/xattr.m4: Likewise. * src/copy.h: Likewise.

dd: Better handle user specified offsets that are too big

2009-01-28T15:14:57Z

Following are the before and after operations for seekable files, for the various erroneous offsets handled by this patch: skip beyond end of file before: immediately exit(0); after : immediately printf("cannot skip to specified offset"); exit(0); skip > max file size before: read whole file and exit(0); after : immediately printf("cannot skip: Invalid argument"); exit(1); seek > max file size before: immediately printf("truncate error: EFBIG"); exit(1); after : immediately printf("truncate error: EFBIG"); exit(1); skip > OFF_T_MAX before: read whole device/file and exit(0); after : immediately printf("cannot skip:"); exit(1); seek > OFF_T_MAX before: immediately printf("truncate error: offset too large"); exit(1); after : immediately printf("truncate error: offset too large"); exit(1); skip > device size before: read whole device and exit(0); after : immediately printf("cannot skip: Invalid argument"); exit(1); seek > device size before: read whole device and printf("write error: ENOSPC"); exit(1); after : immediately printf("cannot seek: Invalid argument"); exit(1); * NEWS: Summarize this change in behavior. * src/dd.c (skip): Add error checking for large seek/skip offsets on seekable files, rather than deferring to using read() to advance offset. (dd_copy): Print a warning if skip past EOF, as per FIXME comment. * test/Makefile.am: Add 2 new tests. * tests/dd/seek-skip-past-file: Add tests for first 3 cases above. * tests/dd/seek-skip-past-dev: Add root only test for last case above.

maint: ensure dd's computation of O_FULLBLOCK uses all O_ symbol names

2008-12-26T11:08:51Z

* src/dd.c (O_FULLBLOCK): Use a more uniform initializer, that makes it easier to extract all O_ symbol names. * maint.mk (syntax-check-rules): Also search for sc_ rules in cfg.mk. (sc_root_tests): Ensure that this rule sets $diff. * cfg.mk (sc_dd_O_FLAGS): New rule.

dd: add support for opening files in Concurrent I/O (CIO) mode

2008-12-26T09:57:05Z

* src/dd.c (O_CIO): New flag. * src/dd.c (O_FULLBLOCK): Add O_CIO to the list of flags that O_FULLBLOCK should be greater than. * src/dd.c (flags): Give the name "cio" to the new O_CIO flag, mirroring the treatment of O_DIRECT. * src/dd.c (usage): Add a description of the new flag when it is available. * doc/coreutils.text (dd invocation): Describe the new flag. * NEWS: Mention the new feature.

Revert part of "dd: avoid unnecessary memory copies"

2008-11-22T09:20:31Z

This reverts part of commit fbd87029cfc494a72bb73ade27ef46382c5bc832. Paul Eggert noticed the problem in http://lists.gnu.org/archive/html/bug-coreutils/2008-11/msg00153.html * doc/coreutils.texi (dd invocation): Clarify.

dd: avoid unnecessary memory copies

2008-11-21T11:50:59Z

* src/dd.c (scanargs): When not otherwise required (e.g. for conversion), use two-buffer mode only when the input and output buffer sizes differ. Before, some of the most basic invocations of dd, e.g., dd < in > out, would unnecessarily use separate buffers and perform memory copies between them.

use new global, "Version", rather than macro, VERSION

2008-08-26T16:45:06Z

With this change, a version-string update no longer forces recompilation of 100+ src/*.o files. * src/version.c (Version): New global. New file. * src/version.h: Declare it. * src/Makefile.am: Put it in a library that everyone links to. (noinst_LIBRARIES, libver_a_SOURCES): Define. (LDADD): Add libver.a. (sc_tight_scope): Use perl (was sed), and a more relaxed regexp to build the global-variable-name-recognizing regexp list. * src/system.h: Include "version.h". (case_GETOPT_VERSION_CHAR): Use Version rather than VERSION. * src/basename.c (main): Use Version rather than VERSION. * src/chroot.c (main): Likewise. * src/cksum.c (main): Likewise. * src/dd.c (main): Likewise. * src/dirname.c (main): Likewise. * src/echo.c (main): Likewise. * src/hostid.c (main): Likewise. * src/hostname.c (main): Likewise. * src/link.c (main): Likewise. * src/logname.c (main): Likewise. * src/nice.c (main): Likewise. * src/nohup.c (main): Likewise. * src/printenv.c (main): Likewise. * src/printf.c (main): Likewise. * src/pwd.c (main): Likewise. * src/setuidgid.c (main): Likewise. * src/sleep.c (main): Likewise. * src/sync.c (main): Likewise. * src/test.c (main): Likewise. * src/timeout.c (main): Likewise. * src/true.c (main): Likewise. * src/tsort.c (main): Likewise. * src/unlink.c (main): Likewise. * src/uptime.c (main): Likewise. * src/users.c (main): Likewise. * src/whoami.c (main): Likewise. * src/yes.c (main): Likewise.

dd: clarify meaning of multiplication factors; put xM in order

2008-08-11T07:47:01Z

dd.c: reduce duplication in new O_FULLBLOCK-defining code

2008-08-09T14:56:01Z

* src/dd.c (MULTIPLE_BITS_SET): New macro, extracted from... (multiple_bits_set): ...this function. Use a single-line, and far simpler expression (no need to list all O_* symbols again) to validate the derived O_FULLBLOCK value.