Initial commit

1 files changed, 76 insertions, 0 deletions

diff --git a/sys/libc/fdopen.c b/sys/libc/fdopen.c
new file mode 100644
index 00000000..c9e2bc9f
--- /dev/null
+++ b/sys/libc/fdopen.c
@@ -0,0 +1,76 @@
+/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+*/
+
+#define	import_spp
+#define	import_libc
+#define	import_stdio
+#define	import_fset
+#include <iraf.h>
+
+	
+extern int c_fstati();
+
+
+/* FDOPEN -- Reopen a file for i/o with the STDIO package, after the file
+** as already been opened by FIO.  It is an error if the access modes are
+** incompatible.
+*/
+FILE *
+fdopen (
+  XINT	fd,			/* FIO file descriptor		*/
+  char	*mode			/* STDIO access mode		*/
+)
+{
+	register int	fio_mode = c_fstati (fd, F_MODE);
+	register int	fio_type = c_fstati (fd, F_TYPE);
+
+
+	/* Verify file access mode.  No mode checking is performed for the
+	 * special file types.
+	 */
+	if (fio_type == TEXT_FILE || fio_type == BINARY_FILE)
+	    switch (mode[0]) {
+	    case 'r':
+		if (fio_mode != READ_ONLY && fio_mode != READ_WRITE)
+		    return (NULL);
+		break;
+
+	    case 'w':
+		switch (fio_mode) {
+		case NEW_FILE:
+		case READ_WRITE:
+		case WRITE_ONLY:
+		    break;
+		default:
+		    return (NULL);
+		}
+		break;
+
+	    case 'a':
+		if (fio_mode != APPEND && fio_mode != NEW_FILE)
+		    return (NULL);
+		break;
+
+	    default:
+		return (NULL);
+	    }
+
+	/* Verify file type.  No checking is performed if no type is given.
+	 */
+	switch (mode[1]) {
+	case EOS:
+	    break;
+	case 't':
+	    if (fio_type != TEXT_FILE)
+		return (NULL);
+	    break;
+	case 'b':
+	    if (fio_type != BINARY_FILE)
+		return (NULL);
+	    break;
+	default:
+	    return (NULL);
+	}
+
+	return (FDTOFP(fd));
+}