Rename process.[hc] to coder.[hc] and io.[hc] to file_io.[hc]

to avoid problems on systems with system headers with those
names.

1 files changed, 0 insertions, 716 deletions

diff --git a/src/xz/io.c b/src/xz/io.c
deleted file mode 100644
index d8eb5f06..00000000
--- a/src/xz/io.c
+++ /dev/null
@@ -1,716 +0,0 @@
-///////////////////////////////////////////////////////////////////////////////
-//
-/// \file       io.c
-/// \brief      File opening, unlinking, and closing
-//
-//  Author:     Lasse Collin
-//
-//  This file has been put into the public domain.
-//  You can do whatever you want with this file.
-//
-///////////////////////////////////////////////////////////////////////////////
-
-#include "private.h"
-
-#include <fcntl.h>
-
-#ifdef DOSLIKE
-#	include <io.h>
-#endif
-
-#if defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
-#	include <sys/time.h>
-#elif defined(HAVE_UTIME)
-#	include <utime.h>
-#endif
-
-#ifndef O_BINARY
-#	define O_BINARY 0
-#endif
-
-#ifndef O_NOCTTY
-#	define O_NOCTTY 0
-#endif
-
-#ifndef DOSLIKE
-#	include "open_stdxxx.h"
-static bool warn_fchown;
-#endif
-
-
-extern void
-io_init(void)
-{
-#ifndef DOSLIKE
-	// Make sure that stdin, stdout, and and stderr are connected to
-	// a valid file descriptor. Exit immediatelly with exit code ERROR
-	// if we cannot make the file descriptors valid. Maybe we should
-	// print an error message, but our stderr could be screwed anyway.
-	open_stdxxx(E_ERROR);
-
-	// If fchown() fails setting the owner, we warn about it only if
-	// we are root.
-	warn_fchown = geteuid() == 0;
-#endif
-
-#ifdef __DJGPP__
-	// Avoid doing useless things when statting files.
-	// This isn't important but doesn't hurt.
-	_djstat_flags = _STAT_INODE | _STAT_EXEC_EXT
-			| _STAT_EXEC_MAGIC | _STAT_DIRSIZE;
-#endif
-
-	return;
-}
-
-
-/// \brief      Unlinks a file
-///
-/// This tries to verify that the file being unlinked really is the file that
-/// we want to unlink by verifying device and inode numbers. There's still
-/// a small unavoidable race, but this is much better than nothing (the file
-/// could have been moved/replaced even hours earlier).
-static void
-io_unlink(const char *name, const struct stat *known_st)
-{
-	// On Windows, st_ino is meaningless, so don't bother testing it.
-#ifndef DOSLIKE
-	struct stat new_st;
-
-	if (lstat(name, &new_st)
-			|| new_st.st_dev != known_st->st_dev
-			|| new_st.st_ino != known_st->st_ino)
-		message_error(_("%s: File seems to be moved, not removing"),
-				name);
-	else
-#endif
-		// There's a race condition between lstat() and unlink()
-		// but at least we have tried to avoid removing wrong file.
-		if (unlink(name))
-			message_error(_("%s: Cannot remove: %s"),
-					name, strerror(errno));
-
-	return;
-}
-
-
-/// \brief      Copies owner/group and permissions
-///
-/// \todo       ACL and EA support
-///
-static void
-io_copy_attrs(const file_pair *pair)
-{
-	// Skip chown and chmod on Windows.
-#ifndef DOSLIKE
-	// This function is more tricky than you may think at first.
-	// Blindly copying permissions may permit users to access the
-	// destination file who didn't have permission to access the
-	// source file.
-
-	// Try changing the owner of the file. If we aren't root or the owner
-	// isn't already us, fchown() probably doesn't succeed. We warn
-	// about failing fchown() only if we are root.
-	if (fchown(pair->dest_fd, pair->src_st.st_uid, -1) && warn_fchown)
-		message_warning(_("%s: Cannot set the file owner: %s"),
-				pair->dest_name, strerror(errno));
-
-	mode_t mode;
-
-	if (fchown(pair->dest_fd, -1, pair->src_st.st_gid)) {
-		message_warning(_("%s: Cannot set the file group: %s"),
-				pair->dest_name, strerror(errno));
-		// We can still safely copy some additional permissions:
-		// `group' must be at least as strict as `other' and
-		// also vice versa.
-		//
-		// NOTE: After this, the owner of the source file may
-		// get additional permissions. This shouldn't be too bad,
-		// because the owner would have had permission to chmod
-		// the original file anyway.
-		mode = ((pair->src_st.st_mode & 0070) >> 3)
-				& (pair->src_st.st_mode & 0007);
-		mode = (pair->src_st.st_mode & 0700) | (mode << 3) | mode;
-	} else {
-		// Drop the setuid, setgid, and sticky bits.
-		mode = pair->src_st.st_mode & 0777;
-	}
-
-	if (fchmod(pair->dest_fd, mode))
-		message_warning(_("%s: Cannot set the file permissions: %s"),
-				pair->dest_name, strerror(errno));
-#endif
-
-	// Copy the timestamps. We have several possible ways to do this, of
-	// which some are better in both security and precision.
-	//
-	// First, get the nanosecond part of the timestamps. As of writing,
-	// it's not standardized by POSIX, and there are several names for
-	// the same thing in struct stat.
-	long atime_nsec;
-	long mtime_nsec;
-
-#	if defined(HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC)
-	// GNU and Solaris
-	atime_nsec = pair->src_st.st_atim.tv_nsec;
-	mtime_nsec = pair->src_st.st_mtim.tv_nsec;
-
-#	elif defined(HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC)
-	// BSD
-	atime_nsec = pair->src_st.st_atimespec.tv_nsec;
-	mtime_nsec = pair->src_st.st_mtimespec.tv_nsec;
-
-#	elif defined(HAVE_STRUCT_STAT_ST_ATIMENSEC)
-	// GNU and BSD without extensions
-	atime_nsec = pair->src_st.st_atimensec;
-	mtime_nsec = pair->src_st.st_mtimensec;
-
-#	elif defined(HAVE_STRUCT_STAT_ST_UATIME)
-	// Tru64
-	atime_nsec = pair->src_st.st_uatime * 1000;
-	mtime_nsec = pair->src_st.st_umtime * 1000;
-
-#	elif defined(HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC)
-	// UnixWare
-	atime_nsec = pair->src_st.st_atim.st__tim.tv_nsec;
-	mtime_nsec = pair->src_st.st_mtim.st__tim.tv_nsec;
-
-#	else
-	// Safe fallback
-	atime_nsec = 0;
-	mtime_nsec = 0;
-#	endif
-
-	// Construct a structure to hold the timestamps and call appropriate
-	// function to set the timestamps.
-#if defined(HAVE_FUTIMENS)
-	// Use nanosecond precision.
-	struct timespec tv[2];
-	tv[0].tv_sec = pair->src_st.st_atime;
-	tv[0].tv_nsec = atime_nsec;
-	tv[1].tv_sec = pair->src_st.st_mtime;
-	tv[1].tv_nsec = mtime_nsec;
-
-	(void)futimens(pair->dest_fd, tv);
-
-#elif defined(HAVE_FUTIMES) || defined(HAVE_FUTIMESAT) || defined(HAVE_UTIMES)
-	// Use microsecond precision.
-	struct timeval tv[2];
-	tv[0].tv_sec = pair->src_st.st_atime;
-	tv[0].tv_usec = atime_nsec / 1000;
-	tv[1].tv_sec = pair->src_st.st_mtime;
-	tv[1].tv_usec = mtime_nsec / 1000;
-
-#	if defined(HAVE_FUTIMES)
-	(void)futimes(pair->dest_fd, tv);
-#	elif defined(HAVE_FUTIMESAT)
-	(void)futimesat(pair->dest_fd, NULL, tv);
-#	else
-	// Argh, no function to use a file descriptor to set the timestamp.
-	(void)utimes(pair->dest_name, tv);
-#	endif
-
-#elif defined(HAVE_UTIME)
-	// Use one-second precision. utime() doesn't support using file
-	// descriptor either. Some systems have broken utime() prototype
-	// so don't make this const.
-	struct utimbuf buf = {
-		.actime = pair->src_st.st_atime,
-		.modtime = pair->src_st.st_mtime,
-	};
-
-	// Avoid warnings.
-	(void)atime_nsec;
-	(void)mtime_nsec;
-
-	(void)utime(pair->dest_name, &buf);
-#endif
-
-	return;
-}
-
-
-/// Opens the source file. Returns false on success, true on error.
-static bool
-io_open_src(file_pair *pair)
-{
-	// There's nothing to open when reading from stdin.
-	if (pair->src_name == stdin_filename) {
-		pair->src_fd = STDIN_FILENO;
-#ifdef DOSLIKE
-		setmode(STDIN_FILENO, O_BINARY);
-#endif
-		return false;
-	}
-
-	// We accept only regular files if we are writing the output
-	// to disk too, and if --force was not given.
-	const bool reg_files_only = !opt_stdout && !opt_force;
-
-	// Flags for open()
-	int flags = O_RDONLY | O_BINARY | O_NOCTTY;
-
-#ifndef DOSLIKE
-	// If we accept only regular files, we need to be careful to avoid
-	// problems with special files like devices and FIFOs. O_NONBLOCK
-	// prevents blocking when opening such files. When we want to accept
-	// special files, we must not use O_NONBLOCK, or otherwise we won't
-	// block waiting e.g. FIFOs to become readable.
-	if (reg_files_only)
-		flags |= O_NONBLOCK;
-#endif
-
-#if defined(O_NOFOLLOW)
-	if (reg_files_only)
-		flags |= O_NOFOLLOW;
-#elif !defined(DOSLIKE)
-	// Some POSIX-like systems lack O_NOFOLLOW (it's not required
-	// by POSIX). Check for symlinks with a separate lstat() on
-	// these systems.
-	if (reg_files_only) {
-		struct stat st;
-		if (lstat(pair->src_name, &st)) {
-			message_error("%s: %s", pair->src_name,
-					strerror(errno));
-			return true;
-
-		} else if (S_ISLNK(st.st_mode)) {
-			message_warning(_("%s: Is a symbolic link, "
-					"skipping"), pair->src_name);
-			return true;
-		}
-	}
-#endif
-
-	// Try to open the file. If we are accepting non-regular files,
-	// unblock the caught signals so that open() can be interrupted
-	// if it blocks e.g. due to a FIFO file.
-	if (!reg_files_only)
-		signals_unblock();
-
-	// Maybe this wouldn't need a loop, since all the signal handlers for
-	// which we don't use SA_RESTART set user_abort to true. But it
-	// doesn't hurt to have it just in case.
-	do {
-		pair->src_fd = open(pair->src_name, flags);
-	} while (pair->src_fd == -1 && errno == EINTR && !user_abort);
-
-	if (!reg_files_only)
-		signals_block();
-
-	if (pair->src_fd == -1) {
-		// If we were interrupted, don't display any error message.
-		if (errno == EINTR) {
-			// All the signals that don't have SA_RESTART
-			// set user_abort.
-			assert(user_abort);
-			return true;
-		}
-
-#ifdef O_NOFOLLOW
-		// Give an understandable error message in if reason
-		// for failing was that the file was a symbolic link.
-		//
-		// Note that at least Linux, OpenBSD, Solaris, and Darwin
-		// use ELOOP to indicate if O_NOFOLLOW was the reason
-		// that open() failed. Because there may be
-		// directories in the pathname, ELOOP may occur also
-		// because of a symlink loop in the directory part.
-		// So ELOOP doesn't tell us what actually went wrong.
-		//
-		// FreeBSD associates EMLINK with O_NOFOLLOW and
-		// Tru64 uses ENOTSUP. We use these directly here
-		// and skip the lstat() call and the associated race.
-		// I want to hear if there are other kernels that
-		// fail with something else than ELOOP with O_NOFOLLOW.
-		bool was_symlink = false;
-
-#	if defined(__FreeBSD__) || defined(__DragonFly__)
-		if (errno == EMLINK)
-			was_symlink = true;
-
-#	elif defined(__digital__) && defined(__unix__)
-		if (errno == ENOTSUP)
-			was_symlink = true;
-
-#	elif defined(__NetBSD__)
-		// FIXME? As of 2008-11-20, NetBSD doesn't document what
-		// errno is used with O_NOFOLLOW. It seems to be EFTYPE,
-		// but since it isn't documented, it may be wrong to rely
-		// on it here.
-		if (errno == EFTYPE)
-			was_symlink = true;
-
-#	else
-		if (errno == ELOOP && reg_files_only) {
-			const int saved_errno = errno;
-			struct stat st;
-			if (lstat(pair->src_name, &st) == 0
-					&& S_ISLNK(st.st_mode))
-				was_symlink = true;
-
-			errno = saved_errno;
-		}
-#	endif
-
-		if (was_symlink)
-			message_warning(_("%s: Is a symbolic link, "
-					"skipping"), pair->src_name);
-		else
-#endif
-			// Something else than O_NOFOLLOW failing
-			// (assuming that the race conditions didn't
-			// confuse us).
-			message_error("%s: %s", pair->src_name,
-					strerror(errno));
-
-		return true;
-	}
-
-#ifndef DOSLIKE
-	// Drop O_NONBLOCK, which is used only when we are accepting only
-	// regular files. After the open() call, we want things to block
-	// instead of giving EAGAIN.
-	if (reg_files_only) {
-		flags = fcntl(pair->src_fd, F_GETFL);
-		if (flags == -1)
-			goto error_msg;
-
-		flags &= ~O_NONBLOCK;
-
-		if (fcntl(pair->src_fd, F_SETFL, flags))
-			goto error_msg;
-	}
-#endif
-
-	// Stat the source file. We need the result also when we copy
-	// the permissions, and when unlinking.
-	if (fstat(pair->src_fd, &pair->src_st))
-		goto error_msg;
-
-	if (S_ISDIR(pair->src_st.st_mode)) {
-		message_warning(_("%s: Is a directory, skipping"),
-				pair->src_name);
-		goto error;
-	}
-
-	if (reg_files_only) {
-		if (!S_ISREG(pair->src_st.st_mode)) {
-			message_warning(_("%s: Not a regular file, "
-					"skipping"), pair->src_name);
-			goto error;
-		}
-
-		// These are meaningless on Windows.
-#ifndef DOSLIKE
-		if (pair->src_st.st_mode & (S_ISUID | S_ISGID)) {
-			// gzip rejects setuid and setgid files even
-			// when --force was used. bzip2 doesn't check
-			// for them, but calls fchown() after fchmod(),
-			// and many systems automatically drop setuid
-			// and setgid bits there.
-			//
-			// We accept setuid and setgid files if
-			// --force was used. We drop these bits
-			// explicitly in io_copy_attr().
-			message_warning(_("%s: File has setuid or "
-					"setgid bit set, skipping"),
-					pair->src_name);
-			goto error;
-		}
-
-		if (pair->src_st.st_mode & S_ISVTX) {
-			message_warning(_("%s: File has sticky bit "
-					"set, skipping"),
-					pair->src_name);
-			goto error;
-		}
-
-		if (pair->src_st.st_nlink > 1) {
-			message_warning(_("%s: Input file has more "
-					"than one hard link, "
-					"skipping"), pair->src_name);
-			goto error;
-		}
-#endif
-	}
-
-	return false;
-
-error_msg:
-	message_error("%s: %s", pair->src_name, strerror(errno));
-error:
-	(void)close(pair->src_fd);
-	return true;
-}
-
-
-/// \brief      Closes source file of the file_pair structure
-///
-/// \param      pair    File whose src_fd should be closed
-/// \param      success If true, the file will be removed from the disk if
-///                     closing succeeds and --keep hasn't been used.
-static void
-io_close_src(file_pair *pair, bool success)
-{
-	if (pair->src_fd != STDIN_FILENO && pair->src_fd != -1) {
-#ifdef DOSLIKE
-		(void)close(pair->src_fd);
-#endif
-
-		// If we are going to unlink(), do it before closing the file.
-		// This way there's no risk that someone replaces the file and
-		// happens to get same inode number, which would make us
-		// unlink() wrong file.
-		//
-		// NOTE: DOS-like systems are an exception to this, because
-		// they don't allow unlinking files that are open. *sigh*
-		if (success && !opt_keep_original)
-			io_unlink(pair->src_name, &pair->src_st);
-
-#ifndef DOSLIKE
-		(void)close(pair->src_fd);
-#endif
-	}
-
-	return;
-}
-
-
-static bool
-io_open_dest(file_pair *pair)
-{
-	if (opt_stdout || pair->src_fd == STDIN_FILENO) {
-		// We don't modify or free() this.
-		pair->dest_name = (char *)"(stdout)";
-		pair->dest_fd = STDOUT_FILENO;
-#ifdef DOSLIKE
-		setmode(STDOUT_FILENO, O_BINARY);
-#endif
-		return false;
-	}
-
-	pair->dest_name = suffix_get_dest_name(pair->src_name);
-	if (pair->dest_name == NULL)
-		return true;
-
-	// If --force was used, unlink the target file first.
-	if (opt_force && unlink(pair->dest_name) && errno != ENOENT) {
-		message_error("%s: Cannot unlink: %s",
-				pair->dest_name, strerror(errno));
-		free(pair->dest_name);
-		return true;
-	}
-
-	if (opt_force && unlink(pair->dest_name) && errno != ENOENT) {
-		message_error("%s: Cannot unlink: %s", pair->dest_name,
-				strerror(errno));
-		free(pair->dest_name);
-		return true;
-	}
-
-	// Open the file.
-	const int flags = O_WRONLY | O_BINARY | O_NOCTTY | O_CREAT | O_EXCL;
-	const mode_t mode = S_IRUSR | S_IWUSR;
-	pair->dest_fd = open(pair->dest_name, flags, mode);
-
-	if (pair->dest_fd == -1) {
-		// Don't bother with error message if user requested
-		// us to exit anyway.
-		if (!user_abort)
-			message_error("%s: %s", pair->dest_name,
-					strerror(errno));
-
-		free(pair->dest_name);
-		return true;
-	}
-
-	// If this really fails... well, we have a safe fallback.
-	if (fstat(pair->dest_fd, &pair->dest_st)) {
-		pair->dest_st.st_dev = 0;
-		pair->dest_st.st_ino = 0;
-	}
-
-	return false;
-}
-
-
-/// \brief      Closes destination file of the file_pair structure
-///
-/// \param      pair    File whose dest_fd should be closed
-/// \param      success If false, the file will be removed from the disk.
-///
-/// \return     Zero if closing succeeds. On error, -1 is returned and
-///             error message printed.
-static int
-io_close_dest(file_pair *pair, bool success)
-{
-	if (pair->dest_fd == -1 || pair->dest_fd == STDOUT_FILENO)
-		return 0;
-
-	if (close(pair->dest_fd)) {
-		message_error(_("%s: Closing the file failed: %s"),
-				pair->dest_name, strerror(errno));
-
-		// Closing destination file failed, so we cannot trust its
-		// contents. Get rid of junk:
-		io_unlink(pair->dest_name, &pair->dest_st);
-		free(pair->dest_name);
-		return -1;
-	}
-
-	// If the operation using this file wasn't successful, we git rid
-	// of the junk file.
-	if (!success)
-		io_unlink(pair->dest_name, &pair->dest_st);
-
-	free(pair->dest_name);
-
-	return 0;
-}
-
-
-extern file_pair *
-io_open(const char *src_name)
-{
-	if (is_empty_filename(src_name))
-		return NULL;
-
-	// Since we have only one file open at a time, we can use
-	// a statically allocated structure.
-	static file_pair pair;
-
-	pair = (file_pair){
-		.src_name = src_name,
-		.dest_name = NULL,
-		.src_fd = -1,
-		.dest_fd = -1,
-		.src_eof = false,
-	};
-
-	// Block the signals, for which we have a custom signal handler, so
-	// that we don't need to worry about EINTR.
-	signals_block();
-
-	file_pair *ret = NULL;
-	if (!io_open_src(&pair)) {
-		// io_open_src() may have unblocked the signals temporarily,
-		// and thus user_abort may have got set even if open()
-		// succeeded.
-		if (user_abort || io_open_dest(&pair))
-			io_close_src(&pair, false);
-		else
-			ret = &pair;
-	}
-
-	signals_unblock();
-
-	return ret;
-}
-
-
-extern void
-io_close(file_pair *pair, bool success)
-{
-	signals_block();
-
-	if (success && pair->dest_fd != STDOUT_FILENO)
-		io_copy_attrs(pair);
-
-	// Close the destination first. If it fails, we must not remove
-	// the source file!
-	if (io_close_dest(pair, success))
-		success = false;
-
-	// Close the source file, and unlink it if the operation using this
-	// file pair was successful and we haven't requested to keep the
-	// source file.
-	io_close_src(pair, success);
-
-	signals_unblock();
-
-	return;
-}
-
-
-extern size_t
-io_read(file_pair *pair, uint8_t *buf, size_t size)
-{
-	// We use small buffers here.
-	assert(size < SSIZE_MAX);
-
-	size_t left = size;
-
-	while (left > 0) {
-		const ssize_t amount = read(pair->src_fd, buf, left);
-
-		if (amount == 0) {
-			pair->src_eof = true;
-			break;
-		}
-
-		if (amount == -1) {
-			if (errno == EINTR) {
-				if (user_abort)
-					return SIZE_MAX;
-
-				continue;
-			}
-
-			message_error(_("%s: Read error: %s"),
-					pair->src_name, strerror(errno));
-
-			// FIXME Is this needed?
-			pair->src_eof = true;
-
-			return SIZE_MAX;
-		}
-
-		buf += (size_t)(amount);
-		left -= (size_t)(amount);
-	}
-
-	return size - left;
-}
-
-
-extern bool
-io_write(const file_pair *pair, const uint8_t *buf, size_t size)
-{
-	assert(size < SSIZE_MAX);
-
-	while (size > 0) {
-		const ssize_t amount = write(pair->dest_fd, buf, size);
-		if (amount == -1) {
-			if (errno == EINTR) {
-				if (user_abort)
-					return -1;
-
-				continue;
-			}
-
-			// Handle broken pipe specially. gzip and bzip2
-			// don't print anything on SIGPIPE. In addition,
-			// gzip --quiet uses exit status 2 (warning) on
-			// broken pipe instead of whatever raise(SIGPIPE)
-			// would make it return. It is there to hide "Broken
-			// pipe" message on some old shells (probably old
-			// GNU bash).
-			//
-			// We don't do anything special with --quiet, which
-			// is what bzip2 does too. If we get SIGPIPE, we
-			// will handle it like other signals by setting
-			// user_abort, and get EPIPE here.
-			if (errno != EPIPE)
-				message_error(_("%s: Write error: %s"),
-					pair->dest_name, strerror(errno));
-
-			return true;
-		}
-
-		buf += (size_t)(amount);
-		size -= (size_t)(amount);
-	}
-
-	return false;
-}