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-rw-r--r--src/stdio/__fdopen.c52
1 files changed, 52 insertions, 0 deletions
diff --git a/src/stdio/__fdopen.c b/src/stdio/__fdopen.c
new file mode 100644
index 00000000..6ad7c57d
--- /dev/null
+++ b/src/stdio/__fdopen.c
@@ -0,0 +1,52 @@
+#include "stdio_impl.h"
+
+FILE *__fdopen(int fd, const char *mode)
+{
+ FILE *f;
+ struct termios tio;
+ int plus = !!strchr(mode, '+');
+
+ /* Check for valid initial mode character */
+ if (!strchr("rwa", *mode)) return 0;
+
+ /* Allocate FILE+buffer or fail */
+ if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
+
+ /* Zero-fill only the struct, not the buffer */
+ memset(f, 0, sizeof *f);
+
+ /* Impose mode restrictions */
+ if (!plus) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+
+ /* Set append mode on fd if opened for append */
+ if (*mode == 'a') {
+ int flags = __syscall_fcntl(fd, F_GETFL, 0);
+ __syscall_fcntl(fd, F_SETFL, flags | O_APPEND);
+ }
+
+ f->fd = fd;
+ f->buf = (unsigned char *)f + sizeof *f + UNGET;
+ f->buf_size = BUFSIZ;
+
+ /* Activate line buffered mode for terminals */
+ f->lbf = EOF;
+ if (!(f->flags & F_NOWR) && !__syscall_ioctl(fd, TCGETS, &tio))
+ f->lbf = '\n';
+
+ /* Initialize op ptrs. No problem if some are unneeded. */
+ f->read = __stdio_read;
+ f->write = __stdio_write;
+ f->seek = __stdio_seek;
+ f->close = __stdio_close;
+
+ /* Add new FILE to open file list */
+ OFLLOCK();
+ f->next = ofl_head;
+ if (ofl_head) ofl_head->prev = f;
+ ofl_head = f;
+ OFLUNLOCK();
+
+ return f;
+}
+
+weak_alias(__fdopen, fdopen);