[PATCH 1/4] semihosting: Don't return negative values on qemu_semihosting_console_write() failure

[Peter Maydell]

The documentation comment for qemu_semihosting_console_write() says
 * Returns: number of bytes written -- this should only ever be short
 * on some sort of i/o error.

and the callsites rely on this.  However, the implementation code
path which sends console output to a chardev doesn't honour this,
and will return negative values on error.  Bring it into line with
the other implementation codepaths and the documentation, so that
it returns 0 on error.

Spotted by Coverity, because console_write() passes the return value
to unlock_user(), which doesn't accept a negative length.

Resolves: Coverity CID 1490288
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
console_write() doesn't need to pass the length to unlock_user()
at all, as it happens -- see the next patch.
---
 semihosting/console.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/semihosting/console.c b/semihosting/console.c
index 5b1ec0a1c39..0f976fe8cb1 100644
--- a/semihosting/console.c
+++ b/semihosting/console.c
@@ -111,7 +111,8 @@ int qemu_semihosting_console_read(CPUState *cs, void *buf, 
int len)
 int qemu_semihosting_console_write(void *buf, int len)
 {
     if (console.chr) {
-        return qemu_chr_write_all(console.chr, (uint8_t *)buf, len);
+        int r = qemu_chr_write_all(console.chr, (uint8_t *)buf, len);
+        return r < 0 ? 0 : r;
     } else {
         return fwrite(buf, 1, len, stderr);
     }
-- 
2.25.1