Implement a smaller puts

The e31's init.c calls puts intsead of printf, which oddly enough is a
lot bigger: since we wrap printf, puts pulls in a lot of newlib.  This
adds a wrapped puts so it's very small.

1 files changed, 26 insertions, 0 deletions

diff --git a/bsp/libwrap/sys/puts.c b/bsp/libwrap/sys/puts.c
new file mode 100644
index 0000000..f77f1a3
--- /dev/null
+++ b/bsp/libwrap/sys/puts.c
@@ -0,0 +1,26 @@
+/* See LICENSE of license details. */
+
+#include <stdint.h>
+#include <errno.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include "platform.h"
+#include "stub.h"
+
+int __wrap_puts(const char *s)
+{
+  while (*s != '\0') {
+    while (UART0_REG(UART_REG_TXFIFO) & 0x80000000) ;
+    UART0_REG(UART_REG_TXFIFO) = *s;
+
+    if (*s == '\n') {
+      while (UART0_REG(UART_REG_TXFIFO) & 0x80000000) ;
+      UART0_REG(UART_REG_TXFIFO) = '\r';
+    }
+
+    ++s;
+  }
+
+  return 0;
+}