web-shims: only update UI on new line

- magiskboot doesn't stop at the middle of a line
  so there were not actually needed

  this should improve terminal perf by a little

Signed-off-by: Ookiineko <chiisaineko@protonmail.com>

Author: Ookiineko

src/web-shims/conio_hack.cc

@@ -10,9 +10,6 @@
 /* 20 ms */
 #define  MBB_CONIO_DELAY            (20)
 
-/* 10 characters */
-#define  MBB_CONOUT_THRESHOLD       (10)
-
 // used for exit code callback in JS
 
 extern int __mbb_main(int argc, char **argv);
@@ -95,7 +92,7 @@ extern "C" {
     }
 }
 
-static void __exit_hook(int status) {
+static inline void __exit_hook(int status) {
     EM_ASM({
         Module['mbb_main_cb']($0);
     }, status);
@@ -117,28 +114,17 @@ __attribute__((noreturn)) static void __exit_wrap(int status) {
     __real_exit(status);
 }
 
-static void __conout_hook(const char *s, size_t len) {
-    // when should we update UI?
-
-    if (len >= MBB_CONOUT_THRESHOLD)
-        goto do_sleep;  // when the line is long enough
-
-    if (memchr(s, '\n', len) || memchr(s, '\r', len))
-        goto do_sleep;  // when there is a newline char in the str
+static inline void __conout_hook(const char *s, size_t len) {
+    // give browser a chance to update UI on each new line
 
-    return;
-
-do_sleep:
-    // sleeping is even more expensive to perf
-    // so only do this when needed
-    emscripten_sleep(MBB_CONIO_DELAY);  // note this needs -sASYNCIFY in LDFLAGS
+    if (memchr(s, '\n', len))
+        emscripten_sleep(MBB_CONIO_DELAY);  // note this needs -sASYNCIFY in LDFLAGS
 }
 
-static void __check_do_conout_hook(int fd, const char *s, size_t len) {
+static inline void __check_do_conout_hook(int fd, const char *s, size_t len) {
     switch (fd) {
         case STDOUT_FILENO:
         case STDERR_FILENO:
-            // give browser a chance to update UI
             __conout_hook(s, len);
             break;
         default:
@@ -193,8 +179,3 @@ static void __enable_conio_hack(void) {
 EMSCRIPTEN_BINDINGS(conio_hack) {
     emscripten::function("mbb_enable_conio_hack", &__enable_conio_hack);
 }
-
-__attribute__((constructor)) static void __init_io_mode(void) {
-    // disable line buffering
-    setvbuf(stdout, NULL, _IONBF, BUFSIZ);
-}