1 files changed, 23 insertions, 0 deletions
diff --git a/lib/itoa.cc b/lib/itoa.cc
new file mode 100644
index 0000000..54c927d
--- /dev/null
+++ b/lib/itoa.cc
@@ -0,0 +1,23 @@
+#include "itoa.h"
+
+const char *itoa(long v, int digits)
+{
+  static char buf[INTLENGTH];
+  bool neg = false;
+  if(v < 0) {
+    v = -v;
+    neg = true;
+  }
+  char* ptr = buf + INTLENGTH;
+  *--ptr = '\0';
+  do {
+    *--ptr = (v % 10) + '0';
+    v /= 10;
+    --digits;
+  } while(v != 0);
+  while(digits > 0 && ptr > buf-1)
+    *--ptr = '0', --digits;
+  if(neg)
+    *--ptr = '-';
+  return ptr;
+}