[Qemu-devel] [PATCH 12/14] tcx: tcx24_screen_dump(): add error handling

[Luiz Capitulino]

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 <lcapitul...@redhat.com>
---
 hw/tcx.c | 50 ++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 40 insertions(+), 10 deletions(-)

diff --git a/hw/tcx.c b/hw/tcx.c
index 74a7085..4027363 100644
--- a/hw/tcx.c
+++ b/hw/tcx.c
@@ -613,10 +613,14 @@ static void tcx24_screen_dump(void *opaque, const char 
*filename, bool cswitch,
     uint32_t *s24, *cptr, dval;
     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;
     s24 = s->vram24;
     cptr = s->cplane;
@@ -625,20 +629,46 @@ static void tcx24_screen_dump(void *opaque, const char 
*filename, bool cswitch,
         for(x = 0; x < s->width; x++, d++, s24++) {
             if ((*cptr++ & 0xff000000) == 0x03000000) { // 24-bit direct
                 dval = *s24 & 0x00ffffff;
-                fputc((dval >> 16) & 0xff, f);
-                fputc((dval >> 8) & 0xff, f);
-                fputc(dval & 0xff, f);
+                qemu_fputc_err((dval >> 16) & 0xff, f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
+
+                qemu_fputc_err((dval >> 8) & 0xff, f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
+
+                qemu_fputc_err(dval & 0xff, f, errp);
+                if (error_is_set(errp)) {
+                    goto out;
+                }
             } else {
                 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;
+                }
             }
         }
         d1 += MAXX;
     }
+
+out:
     fclose(f);
-    return;
+    if (error_is_set(errp)) {
+        unlink(filename);
+    }
 }
 
 static Property tcx_properties[] = {
-- 
1.7.10.2.565.gbd578b5