[Qemu-devel] [PATCH 13/14] tcx: tcx_screen_dump(): add error handling

[Luiz Capitulino <lcapitulino@redhat.com>]

This is done by using qemu_fopen_err(), qemu_fputc_err() and handling
errors appropriately (eg. removing the screendump file if the operation
fails).

Note that the error is not passed up yet, as vga_hw_screen_dump() still
calls consoles[0]->hw_screen_dump() with errp=NULL.

The error will be propagated up when screendump is converted to the QAPI.
That will be done by a later commit.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hw/tcx.c | 34 +++++++++++++++++++++++++++-------
 1 file changed, 27 insertions(+), 7 deletions(-)

diff --git a/hw/tcx.c b/hw/tcx.c
index 4027363..7aa1abe 100644
--- a/hw/tcx.c
+++ b/hw/tcx.c
@@ -584,24 +584,44 @@ static void tcx_screen_dump(void *opaque, const char *filename, bool cswitch,
     uint8_t *d, *d1, v;
     int y, x;
 
-    f = fopen(filename, "wb");
-    if (!f)
+    f = qemu_fopen_err(filename, "wb", errp);
+    if (error_is_set(errp)) {
         return;
-    fprintf(f, "P6\n%d %d\n%d\n", s->width, s->height, 255);
+    }
+    qemu_fprintf_err(errp, f, "P6\n%d %d\n%d\n", s->width, s->height, 255);
+    if (error_is_set(errp)) {
+        goto out;
+    }
     d1 = s->vram;
     for(y = 0; y < s->height; y++) {
         d = d1;
         for(x = 0; x < s->width; x++) {
             v = *d;
-            fputc(s->r[v], f);
-            fputc(s->g[v], f);
-            fputc(s->b[v], f);
+            qemu_fputc_err(s->r[v], f, errp);
+            if (error_is_set(errp)) {
+                goto out;
+            }
+
+            qemu_fputc_err(s->g[v], f, errp);
+            if (error_is_set(errp)) {
+                goto out;
+            }
+
+            qemu_fputc_err(s->b[v], f, errp);
+            if (error_is_set(errp)) {
+                goto out;
+            }
+
             d++;
         }
         d1 += MAXX;
     }
+
+out:
     fclose(f);
-    return;
+    if (error_is_set(errp)) {
+        unlink(filename);
+    }
 }
 
 static void tcx24_screen_dump(void *opaque, const char *filename, bool cswitch,
-- 
1.7.10.2.565.gbd578b5