[Qemu-devel] [PATCH 11/14] g364fb: g364fb_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/g364fb.c | 48 ++++++++++++++++++++++++++++++++++++------------
 1 file changed, 36 insertions(+), 12 deletions(-)

diff --git a/hw/g364fb.c b/hw/g364fb.c
index 498154b..a18a414 100644
--- a/hw/g364fb.c
+++ b/hw/g364fb.c
@@ -301,35 +301,59 @@ static void g364fb_screen_dump(void *opaque, const char *filename, bool cswitch,
     qemu_flush_coalesced_mmio_buffer();
 
     if (s->depth != 8) {
-        error_report("g364: unknown guest depth %d", s->depth);
+        error_set(errp, QERR_INVALID_PARAMETER_VALUE, "depth", "8");
         return;
     }
 
-    f = fopen(filename, "wb");
-    if (!f)
+    f = qemu_fopen_err(filename, "wb", errp);
+    if (error_is_set(errp)) {
         return;
+    }
 
     if (s->ctla & CTLA_FORCE_BLANK) {
         /* blank screen */
-        fprintf(f, "P4\n%d %d\n",
-            s->width, s->height);
+        qemu_fprintf_err(errp, f, "P4\n%d %d\n", s->width, s->height);
+        if (error_is_set(errp)) {
+            goto out;
+        }
         for (y = 0; y < s->height; y++)
-            for (x = 0; x < s->width; x++)
-                fputc(0, f);
+            for (x = 0; x < s->width; x++) {
+                qemu_fputc_err(0, f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
+            }
     } else {
         data_buffer = s->vram + s->top_of_screen;
-        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;
+        }
         for (y = 0; y < s->height; y++)
             for (x = 0; x < s->width; x++, data_buffer++) {
                 index = *data_buffer;
-                fputc(s->color_palette[index][0], f);
-                fputc(s->color_palette[index][1], f);
-                fputc(s->color_palette[index][2], f);
+                qemu_fputc_err(s->color_palette[index][0], f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
+
+                qemu_fputc_err(s->color_palette[index][1], f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
+
+                qemu_fputc_err(s->color_palette[index][2], f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
         }
     }
 
+out:
     fclose(f);
+    if (error_is_set(errp)) {
+        unlink(filename);
+    }
 }
 
 /* called for accesses to io ports */
-- 
1.7.10.2.565.gbd578b5