From 8682553498d32d3c18dea41c598ab40de18404a3 Mon Sep 17 00:00:00 2001 From: user Date: Thu, 16 Jul 2026 07:30:34 +0200 Subject: 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. --- c/wc.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 c/wc.c (limited to 'c/wc.c') diff --git a/c/wc.c b/c/wc.c new file mode 100644 index 0000000..a957542 --- /dev/null +++ b/c/wc.c @@ -0,0 +1,20 @@ +#include "gbos.h" +/* wc: count lines, words, chars of stdin (like `wc`). */ +void main(void) { + unsigned int lines = 0, words = 0, chars = 0; + unsigned char inword = 0; + char c; + for (;;) { + c = readc(); + if (c == EOF) break; + chars++; + if (c == '\n') lines++; + if (c == ' ' || c == '\n' || c == '\r' || c == '\t') { + inword = 0; + } else if (!inword) { + inword = 1; + words++; + } + } + putu(lines); putc(' '); putu(words); putc(' '); putu(chars); nl(); +} -- cgit v1.3.1-sl0p