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, 2 insertions, 1 deletions

diff --git a/c/build.sh b/c/build.sh
index 6a2deab..8034d87 100755
--- a/c/build.sh
+++ b/c/build.sh
@@ -8,12 +8,13 @@ LIBDIR=/usr/share/sdcc/lib/sm83
 mkdir -p "$B"
 sdasgb -o "$B/crt0.rel" c/crt0.s
 sdasgb -o "$B/libc.rel" c/libc.s
+sdcc -msm83 -c -Ic c/libc.c -o "$B/libc_c.rel"
 sdcc -msm83 -c -Ic "$SRC" -o "$B/prog.rel"
 # link: crt0 first (=> _start at 0x4000), then libc, program, and sm83 lib
 sdldgb -n -m -w -j -i "$B/prog.ihx" \
        -b _CODE=0x4000 -b _DATA=0xa000 \
        -k "$LIBDIR" -l sm83 \
-       "$B/crt0.rel" "$B/libc.rel" "$B/prog.rel"
+       "$B/crt0.rel" "$B/libc.rel" "$B/libc_c.rel" "$B/prog.rel"
 makebin -Z -p "$B/prog.ihx" "$B/prog.bin"
 dd if="$B/prog.bin" of="$OUT" bs=1024 skip=16 count=16 2>/dev/null
 echo "wrote $OUT ($(wc -c < "$OUT") bytes); entry:"