tools: wc, head, and an argc/argv demo (args) + libc.c helpers

- c/libc.c: shared C helpers linked into every program - putu (print decimal),
  atou (parse decimal), argv_parse (tokenize getargs() into argc/argv).
- wc: count lines/words/chars of stdin. head [n]: first n lines (drains rest to
  EOF). args: argc/argv demo.
- pid now uses libc putu; build.sh links libc.c; Makefile CBLOBS + libc dep.
- README: document the new tools + argv_parse.
- verified: 'args one two three' -> argc=3/argv[..]; wc '2 3 16'; head 2.

1 files changed, 0 insertions, 7 deletions

diff --git a/c/pid.c b/c/pid.c
index a282a89..9e4e792 100644
--- a/c/pid.c
+++ b/c/pid.c
@@ -1,9 +1,2 @@
 #include "gbos.h"
-/* print an unsigned byte as decimal (no runtime division: subtract-based) */
-static void putu(unsigned char n) {
-    char buf[3]; unsigned char i = 0;
-    if (n == 0) { putc('0'); return; }
-    while (n) { buf[i++] = '0' + (n % 10); n = n / 10; }
-    while (i) putc(buf[--i]);
-}
 void main(void) { putu(getpid()); nl(); }