Opening new buffer which is git show commit command

src/basic/win32.cpp

@@ -421,11 +421,24 @@ StdoutPollInfo PollStdout(Process *process, char *buffer, int64_t buffer_size) {
     Assert(process->is_valid);
     Win32Process *p = (Win32Process *)process->platform;
 
-    DWORD bytes_read  = 0;
     DWORD bytes_avail = 0;
 
-    bool peek_error = PeekNamedPipe(p->child_stdout_read, buffer, (DWORD)buffer_size, &bytes_read, &bytes_avail, NULL) == 0;
+    StdoutPollInfo result     = {};
+    bool           peek_error = PeekNamedPipe(p->child_stdout_read, NULL, 0, NULL, &bytes_avail, NULL) == 0;
+    if (peek_error) {
+        return result;
+    }
 
-    StdoutPollInfo result = {bytes_read, bytes_avail};
+    if (bytes_avail == 0) {
+        return result;
+    }
+
+    DWORD bytes_read = 0;
+    bool  read_error = ReadFile(p->child_stdout_read, buffer, (DWORD)buffer_size, &bytes_read, 0) == 0;
+    if (read_error) {
+        return result;
+    }
+
+    result = {bytes_read, bytes_avail - bytes_read};
     return result;
 }