liblinux++

commit 45288b3777f08d28498f04f554105b77821317b8
parent cef6981283f4881c9d4d6df78db7ecd3b5028938
Author: Henry Wilson <henry@henryandlizzy.uk>
Date:   Mon, 16 Dec 2024 15:36:13 +0000

add cat example

Diffstat:
M
Tupfile
 | 
6
++++--
A
cat.c
 | 
29
+++++++++++++++++++++++++++++
R
main.c -> echo.c
 | 
0

3 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/Tupfile b/Tupfile
@@ -1,7 +1,9 @@
 CFLAGS = -Os -fno-asynchronous-unwind-tables -no-pie -g
 LDFLAGS = -static -nostartfiles -nostdlib -no-pie -Xlinker --gc-sections
 
-: foreach *.c *.s |> cc $(CFLAGS) -c -o %o %f |> obj/%B.o {objs}
-: {objs} |> cc $(LDFLAGS) -o %o -T x86_64.ld %f |> echo
+: foreach *.s |> cc $(CFLAGS) -c -o %o %f |> obj/%B.o {asm_objs}
+: foreach *.c |> cc $(CFLAGS) -c -o %o %f |> obj/%B.o
+: obj/echo.o {asm_objs} | x86_64.ld |> cc $(LDFLAGS) -o %o -T x86_64.ld %f |> %1B
+: obj/cat.o {asm_objs} | x86_64.ld |> cc $(LDFLAGS) -o %o -T x86_64.ld %f |> %1B
 
 .gitignore
diff --git a/cat.c b/cat.c
@@ -0,0 +1,29 @@
+#include "syscall.h"
+
+static void cat(int fd)
+{
+	static char buf[0x1000];
+
+	for (;;)
+	{
+		int n = read(fd, buf, sizeof(buf));
+		if (n < 0)
+			exit(2);
+		if (n == 0)
+			return;
+		if (write(1, buf, n) != n)
+			exit(3);
+	}
+}
+
+int main(int argc, char* argv[])
+{
+	for (int i = 1; i < argc; ++i)
+	{
+		int fd = open(argv[i], 0, /*O_RDONLY*/0);
+		if (fd < 0)
+			return 1;
+		cat(fd);
+		close(fd);
+	}
+}
diff --git a/main.c b/echo.c