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Unified Diff: fusl/src/stdio/__fdopen.c

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/stdio/__fdopen.c
diff --git a/fusl/src/stdio/__fdopen.c b/fusl/src/stdio/__fdopen.c
new file mode 100644
index 0000000000000000000000000000000000000000..8d6ce813e45ec8ed880e1680d38fb409b4f63000
--- /dev/null
+++ b/fusl/src/stdio/__fdopen.c
@@ -0,0 +1,60 @@
+#include "stdio_impl.h"
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+
+FILE *__fdopen(int fd, const char *mode)
+{
+ FILE *f;
+ struct winsize wsz;
+
+ /* Check for valid initial mode character */
+ if (!strchr("rwa", *mode)) {
+ errno = EINVAL;
+ 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 (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
+
+ /* Apply close-on-exec flag */
+ if (strchr(mode, 'e')) __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
+
+ /* Set append mode on fd if opened for append */
+ if (*mode == 'a') {
+ int flags = __syscall(SYS_fcntl, fd, F_GETFL);
+ if (!(flags & O_APPEND))
+ __syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
+ f->flags |= F_APP;
+ }
+
+ 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(SYS_ioctl, fd, TIOCGWINSZ, &wsz))
+ 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;
+
+ if (!libc.threaded) f->lock = -1;
+
+ /* Add new FILE to open file list */
+ return __ofl_add(f);
+}
+
+weak_alias(__fdopen, fdopen);
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