示例#1
0
文件: dd.c 项目: lacombar/netbsd-alc
static void
setup(void)
{

	if (in.name == NULL) {
		in.name = "stdin";
		in.fd = STDIN_FILENO;
	} else {
		in.fd = open(in.name, O_RDONLY, 0);
		if (in.fd < 0)
			err(EXIT_FAILURE, "%s", in.name);
			/* NOTREACHED */

		/* Ensure in.fd is outside the stdio descriptor range */
		in.fd = redup_clean_fd(in.fd);
	}

	getfdtype(&in);

	if (files_cnt > 1 && !(in.flags & ISTAPE)) {
		errx(EXIT_FAILURE, "files is not supported for non-tape devices");
		/* NOTREACHED */
	}

	if (out.name == NULL) {
		/* No way to check for read access here. */
		out.fd = STDOUT_FILENO;
		out.name = "stdout";
	} else {
#define	OFLAGS \
    (O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC))
		out.fd = open(out.name, O_RDWR | OFLAGS, DEFFILEMODE);
		/*
		 * May not have read access, so try again with write only.
		 * Without read we may have a problem if output also does
		 * not support seeks.
		 */
		if (out.fd < 0) {
			out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE);
			out.flags |= NOREAD;
		}
		if (out.fd < 0) {
			err(EXIT_FAILURE, "%s", out.name);
			/* NOTREACHED */
		}

		/* Ensure out.fd is outside the stdio descriptor range */
		out.fd = redup_clean_fd(out.fd);
	}

	getfdtype(&out);

	/*
	 * Allocate space for the input and output buffers.  If not doing
	 * record oriented I/O, only need a single buffer.
	 */
	if (!(ddflags & (C_BLOCK|C_UNBLOCK))) {
		if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL) {
			err(EXIT_FAILURE, NULL);
			/* NOTREACHED */
		}
		out.db = in.db;
	} else if ((in.db =
	    malloc((u_int)(MAX(in.dbsz, cbsz) + cbsz))) == NULL ||
	    (out.db = malloc((u_int)(out.dbsz + cbsz))) == NULL) {
		err(EXIT_FAILURE, NULL);
		/* NOTREACHED */
	}
	in.dbp = in.db;
	out.dbp = out.db;

	/* Position the input/output streams. */
	if (in.offset)
		pos_in();
	if (out.offset)
		pos_out();

	/*
	 * Truncate the output file; ignore errors because it fails on some
	 * kinds of output files, tapes, for example.
	 */
	if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK))
		(void)ftruncate(out.fd, (off_t)out.offset * out.dbsz);

	/*
	 * If converting case at the same time as another conversion, build a
	 * table that does both at once.  If just converting case, use the
	 * built-in tables.
	 */
	if (ddflags & (C_LCASE|C_UCASE)) {
#ifdef	NO_CONV
		/* Should not get here, but just in case... */
		errx(EXIT_FAILURE, "case conv and -DNO_CONV");
		/* NOTREACHED */
#else	/* NO_CONV */
		u_int cnt;

		if (ddflags & C_ASCII || ddflags & C_EBCDIC) {
			if (ddflags & C_LCASE) {
				for (cnt = 0; cnt < 256; ++cnt)
					casetab[cnt] = tolower(ctab[cnt]);
			} else {
				for (cnt = 0; cnt < 256; ++cnt)
					casetab[cnt] = toupper(ctab[cnt]);
			}
		} else {
			if (ddflags & C_LCASE) {
				for (cnt = 0; cnt < 256; ++cnt)
					casetab[cnt] = tolower(cnt);
			} else {
				for (cnt = 0; cnt < 256; ++cnt)
					casetab[cnt] = toupper(cnt);
			}
		}

		ctab = casetab;
#endif	/* NO_CONV */
	}

	(void)gettimeofday(&st.start, NULL);	/* Statistics timestamp. */
}
示例#2
0
static void
setup(void)
{

	if (in.name == NULL) {
		in.name = "stdin";
		in.fd = STDIN_FILENO;
	} else {
		in.fd = open(in.name, O_RDONLY, 0);
		if (in.fd < 0) {
			fprintf(stderr, "%s: cannot open for read: %s\n",
				in.name, strerror(errno));
			exit(1);
			/* NOTREACHED */
		}

		/* Ensure in.fd is outside the stdio descriptor range */
		in.fd = redup_clean_fd(in.fd);
	}

	getfdtype(&in);

	if (files_cnt > 1 && !(in.flags & ISTAPE)) {
		fprintf(stderr,
			"files is not supported for non-tape devices\n");
		exit(1);
		/* NOTREACHED */
	}

	if (out.name == NULL) {
		/* No way to check for read access here. */
		out.fd = STDOUT_FILENO;
		out.name = "stdout";
	} else {
#define	OFLAGS \
    (O_CREAT | (ddflags & (C_SEEK | C_NOTRUNC) ? 0 : O_TRUNC))
		out.fd = open(out.name, O_RDWR | OFLAGS, DEFFILEMODE);
		/*
		 * May not have read access, so try again with write only.
		 * Without read we may have a problem if output also does
		 * not support seeks.
		 */
		if (out.fd < 0) {
			out.fd = open(out.name, O_WRONLY | OFLAGS, DEFFILEMODE);
			out.flags |= NOREAD;
		}
		if (out.fd < 0) {
			fprintf(stderr, "%s: cannot open for write: %s\n",
				out.name, strerror(errno));
			exit(1);
			/* NOTREACHED */
		}

		/* Ensure out.fd is outside the stdio descriptor range */
		out.fd = redup_clean_fd(out.fd);
	}

	getfdtype(&out);

	/*
	 * Allocate space for the input and output buffers.  If not doing
	 * record oriented I/O, only need a single buffer.
	 */
	if (!(ddflags & (C_BLOCK|C_UNBLOCK))) {
		if ((in.db = malloc(out.dbsz + in.dbsz - 1)) == NULL) {
			exit(1);
			/* NOTREACHED */
		}
		out.db = in.db;
	} else if ((in.db =
	    malloc((u_int)(MAX(in.dbsz, cbsz) + cbsz))) == NULL ||
	    (out.db = malloc((u_int)(out.dbsz + cbsz))) == NULL) {
		exit(1);
		/* NOTREACHED */
	}
	in.dbp = in.db;
	out.dbp = out.db;

	/* Position the input/output streams. */
	if (in.offset)
		pos_in();
	if (out.offset)
		pos_out();

	/*
	 * Truncate the output file; ignore errors because it fails on some
	 * kinds of output files, tapes, for example.
	 */
	if ((ddflags & (C_OF | C_SEEK | C_NOTRUNC)) == (C_OF | C_SEEK))
		(void)ftruncate(out.fd, (off_t)out.offset * out.dbsz);

	(void)gettimeofday(&st.start, NULL);	/* Statistics timestamp. */
}