1 files changed, 59 insertions, 0 deletions
diff --git a/usr/klibc/stdio/fopen.c b/usr/klibc/stdio/fopen.c
new file mode 100644
index 0000000..cf098df
--- /dev/null
+++ b/usr/klibc/stdio/fopen.c
@@ -0,0 +1,59 @@
+/*
+ * fopen.c
+ */
+
+#include "stdioint.h"
+
+static int __parse_open_mode(const char *mode)
+{
+	int rwflags = O_RDONLY;
+	int crflags = 0;
+	int eflags  = 0;
+
+	while (*mode) {
+		switch (*mode++) {
+		case 'r':
+			rwflags = O_RDONLY;
+			crflags = 0;
+			break;
+		case 'w':
+			rwflags = O_WRONLY;
+			crflags = O_CREAT | O_TRUNC;
+			break;
+		case 'a':
+			rwflags = O_WRONLY;
+			crflags = O_CREAT | O_APPEND;
+			break;
+		case 'e':
+			eflags |= O_CLOEXEC;
+			break;
+		case 'x':
+			eflags |= O_EXCL;
+			break;
+		case '+':
+			rwflags = O_RDWR;
+			break;
+		}
+	}
+
+	return rwflags | crflags | eflags;
+}
+
+FILE *fopen(const char *file, const char *mode)
+{
+	int flags = __parse_open_mode(mode);
+	int fd, err;
+	FILE *f;
+
+	fd = open(file, flags, 0666);
+	if (fd < 0)
+		return NULL;
+
+	f = fdopen(fd, mode);
+	if (!f) {
+		err = errno;
+		close(fd);
+		errno = err;
+	}
+	return f;
+}