refactor: c/ -> usr/, compiled program blobs out of the source tree

Userland sources live in usr/ (fits the Unix theme better than 'c').
SDCC output .bin blobs land in build/usr/ with the other build artifacts
instead of littering the source dir; programs.asm INCBINs them from there.
Byte-identical ROM.

1 files changed, 10 insertions, 0 deletions

diff --git a/usr/ls.c b/usr/ls.c
new file mode 100644
index 0000000..0e2e01f
--- /dev/null
+++ b/usr/ls.c
@@ -0,0 +1,10 @@
+#include "gbos.h"
+/* ls [dir]: list a directory (default: current). */
+void main(void) {
+    char *argv[4];
+    char name[16];
+    unsigned char argc = argv_parse(argv, 4);
+    unsigned char i;
+    if (opendir(argc > 0 ? argv[0] : ".")) { puts("ls: no such directory"); nl(); return; }
+    for (i = 0; flist(i, name); i++) { name[15] = 0; puts(name); nl(); }
+}