Add os statusbar. Start stdlib

2 files changed, 22 insertions, 0 deletions

diff --git a/os/stdlib/sdtlib.h b/os/stdlib/sdtlib.h
new file mode 100644
index 0000000..a0b3402
--- /dev/null
+++ b/os/stdlib/sdtlib.h
@@ -0,0 +1 @@
+char* int_to_str(int i);
\ No newline at end of file
diff --git a/os/stdlib/stdlib.c b/os/stdlib/stdlib.c
new file mode 100644
index 0000000..465e978
--- /dev/null
+++ b/os/stdlib/stdlib.c
@@ -0,0 +1,21 @@
+char* int_to_str(int i)
+{
+  // Room for 4 byte int, -ve sign and null terminator
+  static char buf[12];
+  char *p = buf + 11;	// points to null terminator
+  if (i >= 0) {
+    do {
+      *--p = '0' + (i % 10);
+      i /= 10;
+    } while (i != 0);
+    return p;
+  }
+  else {
+    do {
+      *--p = '0' - (i % 10);
+      i /= 10;
+    } while (i != 0);
+    *--p = '-';
+  }
+  return p;
+}
\ No newline at end of file