utils

commit: ccd21b73a852b3b96e52adf0d788bbe93d8329bd
parent 38639154906256254347582effbfe2856da7863a
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Thu,  8 Jul 2021 13:05:16 +0200

bin/cat: New util

Diffstat:
M
bin/Makefile.config
2
+-
A
bin/cat.c
75
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
test-bin/Kyuafile
1
+
A
test-bin/cat
22
++++++++++++++++++++++

4 files changed, 99 insertions(+), 1 deletion(-)
diff --git a/bin/Makefile.config b/bin/Makefile.config
@@ -1,2 +1,2 @@
-EXE = args basename date del dirname echo false humanize lolcat mdate pwd range sizeof sname true tty xcd
+EXE = args basename cat date del dirname echo false humanize lolcat mdate pwd range sizeof sname true tty xcd
 MAN1 = basename.1 date.1 del.1 dirname.1 humanize.1 lolcat.1 sname.1
diff --git a/bin/cat.c b/bin/cat.c
@@ -0,0 +1,75 @@
+// Collection of Unix tools, comparable to coreutils
+// Copyright 2017-2021 Haelwenn (lanodan) Monnier <contact+utils@hacktivis.me>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only
+
+#define _POSIX_C_SOURCE 200809L
+#include <errno.h>  /* errno */
+#include <stdio.h>  /* fprintf(), BUFSIZ */
+#include <unistd.h> /* read(), write(), close() */
+#include <string.h> /* strerror(), strncmp() */
+#include <fcntl.h>  /* open(), O_RDONLY */
+
+int
+concat(int fd, const char *fdname)
+{
+	ssize_t c;
+	char buf[BUFSIZ];
+
+	while((c = read(fd, buf, sizeof(buf))) > 0)
+	{
+		if(write(1, buf, (size_t)c) < 0)
+		{
+			fprintf(stderr, "\nError writing: %s\n", strerror(errno));
+			return 1;
+		}
+	}
+
+	if(c < 0)
+	{
+		fprintf(stderr, "\nError reading ‘%s’: %s\n", fdname, strerror(errno));
+		return 1;
+	}
+
+	return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+	if(argc <= 1)
+	{
+		return concat(0, "<stdin>");
+	}
+
+	for(int argi = 1; argi < argc; argi++)
+	{
+		if(strncmp(argv[argi], "-", 2) == 0)
+		{
+			if(concat(0, "<stdin>") != 0)
+			{
+				return 1;
+			}
+		}
+		else
+		{
+			int fd = open(argv[argi], O_RDONLY);
+			if(fd < 0) {
+				fprintf(stderr, "\nError opening ‘%s’: %s\n", argv[argi], strerror(errno));
+				return 1;
+			}
+
+			if(concat(fd, argv[argi]) != 0)
+			{
+				return 1;
+			}
+
+			if(close(fd) < 0)
+			{
+				fprintf(stderr, "\nError closing ‘%s’: %s\n", argv[argi], strerror(errno));
+				return 1;
+			}
+		}
+	}
+
+	return 0;
+}
diff --git a/test-bin/Kyuafile b/test-bin/Kyuafile
@@ -4,6 +4,7 @@ test_suite("utils")
 
 -- /BEGIN/,$ | LC_ALL=C.UTF-8 sort
 atf_test_program{name="args"}
+atf_test_program{name="cat"}
 atf_test_program{name="basename"}
 atf_test_program{name="dirname"}
 atf_test_program{name="sname"}
diff --git a/test-bin/cat b/test-bin/cat
@@ -0,0 +1,22 @@
+#!/usr/bin/env atf-sh
+atf_test_case openfile
+openfile_body() {
+	atf_check -o file:all_bytes ../bin/cat all_bytes
+}
+
+atf_test_case stdinput
+stdinput_body() {
+	atf_check -o file:all_bytes ../bin/cat <all_bytes
+}
+
+atf_test_case devnull
+devnull_body() {
+	atf_check ../bin/cat /dev/null
+}
+
+atf_init_test_cases() {
+	cd "$(atf_get_srcdir)"
+	atf_add_test_case openfile
+	atf_add_test_case stdinput
+	atf_add_test_case devnull
+}