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framebuffer: handle an edge case

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Matheus
2022-09-24 15:14:20 -03:00
parent 313abaeb9a
commit 619b95c7f1
1 changed files with 7 additions and 3 deletions
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src/video/framebuffer.c
+7 -3
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@@ -18,6 +18,10 @@ static int devchecks(int fb, size_t* count, size_t offset){
size_t end = fbs[fb]->pitch * fbs[fb]->height; size_t end = fbs[fb]->pitch * fbs[fb]->height;
if(offset >= end){
*count = 0;
}
if(*count + offset > end) if(*count + offset > end)
*count = end - offset; *count = end - offset;
@@ -32,9 +36,9 @@ int read(int* error, int minor, void* buff, size_t count, size_t offset){
if(*error) if(*error)
return -1; return -1;
memcpy(buff, fbs[minor]->address + offset, count); memcpy(buff, fbs[minor]->address + offset, count);
return count; return count;
} }
@@ -45,7 +49,7 @@ int write(int* error, int minor, void* buff, size_t count, size_t offset){
if(*error) if(*error)
return -1; return -1;
memcpy(fbs[minor]->address + offset, buff, count); memcpy(fbs[minor]->address + offset, buff, count);
return count; return count;