Initial revision

lang/cem/libcc.ansi/stdio/fopen.c

@@ -0,0 +1,83 @@
+/*
+ * fopen.c - open a stream
+ */
+/* $Header$ */
+
+#include	<stdio.h>
+#include	<stdlib.h>
+#include	<sys/file.h>
+#include	"loc_incl.h"
+
+#define	PMODE		0666
+
+int open(const char *path, int flags, int mode);
+int close(int d);
+
+FILE *
+fopen(const char *name, const char *mode)
+{
+	register int i;
+	int rwmode = 0, rwflags = 0;
+	FILE *stream;
+	int fd, flags = 0;
+
+	for (i = 0; _iotable[i] != 0 ; i++) 
+		if ( i >= FOPEN_MAX )
+			return (FILE *)NULL;
+
+	switch(*mode++) {
+
+	case 'r':
+		flags |= _IOREAD;	
+		rwmode = O_RDONLY;
+		break;
+
+	case 'w':
+		flags |= _IOWRITE;
+		rwmode = O_WRONLY;
+		rwflags = O_CREAT | O_TRUNC;
+		break;
+
+	case 'a': 
+		flags |= _IOWRITE;
+		rwmode = O_WRONLY;
+		rwflags |= O_APPEND | O_CREAT;
+		break;         
+
+	default:
+		return (FILE *)NULL;
+	}
+
+	while (*mode) {
+		switch(*mode++) {
+
+		case 'b':
+			break;
+
+		case '+':
+			rwmode = O_RDWR;
+			flags |= _IOREAD | _IOWRITE;
+			break;
+
+		default:
+			return (FILE *)NULL;
+
+		}
+	}
+
+	fd = open(name, rwmode | rwflags, PMODE);
+
+	if (fd < 0) return (FILE *)NULL;
+
+	if (( stream = (FILE *) malloc(sizeof(FILE))) == NULL ) {
+		close(fd);
+		return (FILE *)NULL;
+	}
+
+	stream->_count = 0;
+	stream->_fd = fd;
+	stream->_flags = flags;
+	stream->_buf = 0;
+	_iotable[i] = stream;
+	return stream;
+}