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Implement read-only /dev/clipboard (fix ish-app#192)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| // Pasteboard is implementation of /dev/clipboard device | ||
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| #define CLIPBOARD_DEV_MINOR 0 | ||
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| extern struct dev_ops clipboard_dev; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| #include <string.h> | ||
| #import <UIKit/UIKit.h> | ||
| #include "fs/poll.h" | ||
| #include "fs/dyndev.h" | ||
| #include "kernel/errno.h" | ||
| #include "debug.h" | ||
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| #if 0 | ||
| #define CLIP_DEBUG_PRINTK(...) printk | ||
| #else | ||
| #define CLIP_DEBUG_PRINTK(...) | ||
| #endif | ||
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| static void inline dump_clipboard_state(const char* tag, struct fd *fd) { | ||
| CLIP_DEBUG_PRINTK("%s offset=%d pb_gen=%d len=%lu\n", tag, fd->offset, fd->eventfd.val, UIPasteboard.generalPasteboard.string.length); | ||
| } | ||
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| // Generation aka UIPasteboard changeCount is stored at fd->eventfd.val | ||
| // | ||
| // If pasteboard contents were changed since file was opened, | ||
| // all read operations on in return IO Error | ||
| static int check_read_generation(struct fd* fd, UIPasteboard *pb) { | ||
| uint64_t pb_gen = (uint64_t)pb.changeCount; | ||
| uint64_t fd_gen = fd->eventfd.val; | ||
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| CLIP_DEBUG_PRINTK("%s(%p): pb_gen=%d fd_gen=%d offset=%d\n", __func__, fd, pb_gen, fd_gen, fd->offset); | ||
| // XXX: fd_gen modifications should be locked | ||
| if (fd_gen == 0 || fd->offset == 0) { | ||
| fd->eventfd.val = pb_gen; | ||
| } else if (fd_gen != pb_gen) { | ||
| return _EIO; | ||
| } | ||
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| return 0; | ||
| } | ||
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| static int clipboard_poll(struct fd *fd) { | ||
| CLIP_DEBUG_PRINTK("%s(%p)\n", fd, __func__); | ||
| int rv = 0; | ||
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| UIPasteboard* pb = UIPasteboard.generalPasteboard; | ||
| if (check_read_generation(fd, pb) == 0) { | ||
| if (fd->offset < pb.string.length) { | ||
| rv |= POLL_READ; | ||
| } | ||
| } | ||
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| return rv; | ||
| } | ||
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| static ssize_t clipboard_read(struct fd *fd, void *buf, size_t bufsize) { | ||
| CLIP_DEBUG_PRINTK("%s(%p, buf, %zu)\n", __func__, fd, bufsize); | ||
| dump_clipboard_state("read pre", fd); | ||
| UIPasteboard* pb = UIPasteboard.generalPasteboard; | ||
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| NSString *contents = pb.string; | ||
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| int err = check_read_generation(fd, pb); | ||
| if (err != 0) { | ||
| return err; | ||
| } | ||
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| size_t length = contents.length; | ||
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| size_t remaining = length - fd->offset; | ||
| if ((size_t) fd->offset > length) | ||
| remaining = 0; | ||
| size_t n = bufsize; | ||
| if (n > remaining) | ||
| n = remaining; | ||
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| if (n != 0) { | ||
| memcpy(buf, contents.UTF8String + fd->offset, n); | ||
| fd->offset += n; | ||
| } | ||
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| dump_clipboard_state("read post", fd); | ||
| return n; | ||
| } | ||
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| static off_t_ clipboard_lseek(struct fd *fd, off_t_ off, int whence) { | ||
| CLIP_DEBUG_PRINTK("%s(%p, off=%d, whence=%d)\n", __func__, fd, off, whence); | ||
| dump_clipboard_state("lseek pre", fd); | ||
| off_t_ old_off = fd->offset; | ||
| size_t length = 0; | ||
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| if (whence != LSEEK_SET || off != 0) { | ||
| UIPasteboard *pb = UIPasteboard.generalPasteboard; | ||
| length = pb.string.length; | ||
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| int err = check_read_generation(fd, pb); | ||
| if (err != 0) { | ||
| return err; | ||
| } | ||
| } | ||
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| switch (whence) { | ||
| case LSEEK_SET: | ||
| fd->offset = off; | ||
| break; | ||
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| case LSEEK_CUR: | ||
| fd->offset += off; | ||
| break; | ||
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| case LSEEK_END: | ||
| fd->offset = length + off; | ||
| break; | ||
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| default: | ||
| return _EINVAL; | ||
| } | ||
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| if (fd->offset < 0) { | ||
| fd->offset = old_off; | ||
| return _EINVAL; | ||
| } | ||
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| dump_clipboard_state("lseek post", fd); | ||
| return fd->offset; | ||
| } | ||
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| static int clipboard_close(struct fd *fd) { | ||
| CLIP_DEBUG_PRINTK("%s(%p)\n", __func__, fd); | ||
| return 0; | ||
| } | ||
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| static int clipboard_open(int major, int minor, struct fd *fd) { | ||
| CLIP_DEBUG_PRINTK("%s(%p)\n", __func__, fd); | ||
| return 0; | ||
| } | ||
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| struct dev_ops clipboard_dev = { | ||
| .open = clipboard_open, | ||
| .fd.read = clipboard_read, | ||
| .fd.lseek = clipboard_lseek, | ||
| .fd.poll = clipboard_poll, | ||
| .fd.close = clipboard_close, | ||
| }; |
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