feat: add sleep ms function

src/sleepms.c

@@ -0,0 +1,24 @@
+#include "sleepms.h"
+
+#ifdef WIN32
+#include <windows.h>
+#elif _POSIX_C_SOURCE >= 199309L
+#include <time.h>   // for nanosleep
+#else
+#include <unistd.h> // for usleep
+#endif
+
+void sleep_ms(int milliseconds){ // cross-platform sleep function
+#ifdef WIN32
+    Sleep(milliseconds);
+#elif _POSIX_C_SOURCE >= 199309L
+    struct timespec ts;
+    ts.tv_sec = milliseconds / 1000;
+    ts.tv_nsec = (milliseconds % 1000) * 1000000;
+    nanosleep(&ts, NULL);
+#else
+    if (milliseconds >= 1000)
+      sleep(milliseconds / 1000);
+    usleep((milliseconds % 1000) * 1000);
+#endif
+}

src/sleepms.h

@@ -0,0 +1,6 @@
+#ifndef SLEEPMS_H
+#define SLEEPMS_H
+
+void sleep_ms(int milliseconds);
+
+#endif // SLEEPMS_H