From 0b44a0315b47dd8eced9f3b7f31580cf14bbfc01 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 12 Feb 2011 00:22:29 -0500 Subject: initial check-in, version 0.5.0 --- src/stdio/fopen.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 src/stdio/fopen.c (limited to 'src/stdio/fopen.c') diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c new file mode 100644 index 00000000..670cf5f3 --- /dev/null +++ b/src/stdio/fopen.c @@ -0,0 +1,34 @@ +#include "stdio_impl.h" + +FILE *fopen(const char *filename, const char *mode) +{ + FILE *f; + int fd; + int flags; + int plus = !!strchr(mode, '+'); + + /* Check for valid initial mode character */ + if (!strchr("rwa", *mode)) { + errno = EINVAL; + return 0; + } + + /* Compute the flags to pass to open() */ + if (plus) flags = O_RDWR; + else if (*mode == 'r') flags = O_RDONLY; + else flags = O_WRONLY; + if (*mode != 'r') flags |= O_CREAT; + if (*mode == 'w') flags |= O_TRUNC; + if (*mode == 'a') flags |= O_APPEND; + + fd = __syscall_open(filename, flags, 0666); + if (fd < 0) return 0; + + f = __fdopen(fd, mode); + if (f) return f; + + __syscall_close(fd); + return 0; +} + +LFS64(fopen); -- cgit v1.2.1