From ba2d7ae1d7b319645b10aaa31a7f664f9f80c25c Mon Sep 17 00:00:00 2001 From: user Date: Sat, 18 Jul 2026 00:38:38 +0200 Subject: 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. --- usr/head.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 usr/head.c (limited to 'usr/head.c') diff --git a/usr/head.c b/usr/head.c new file mode 100644 index 0000000..3298e54 --- /dev/null +++ b/usr/head.c @@ -0,0 +1,28 @@ +#include "gbos.h" +/* head [-n N] [N] [file]: first N lines of a file or stdin (default 10). */ +void main(void) { + char *argv[8]; + unsigned char argc = argv_parse(argv, 8); + char *nv = optval(argv, argc, 'n'); + unsigned char n = 10, lines = 0, i, fd = NOFD; + char *fname = 0; + int ch; + if (nv) n = atou(nv); + for (i = 0; i < argc; i++) { + if (argv[i][0] == '-') continue; + if (nv == argv[i]) continue; + if (!nv && argv[i][0] >= '0' && argv[i][0] <= '9') { n = atou(argv[i]); continue; } + fname = argv[i]; break; + } + if (fname) { + fd = open(fname, O_READ); + if (fd > 3) { puts("head: no such file"); nl(); return; } + } + for (;;) { + if (fd > 3) { char c = readc(); if (c == EOF) break; ch = c; } + else { ch = fgetc(fd); if (ch < 0) break; } + if (lines < n) putc((char)ch); + if (ch == '\n') lines++; + } + if (fd != NOFD) close(fd); +} -- cgit v1.3.1-sl0p