1 files changed, 138 insertions, 0 deletions
diff --git a/examples/loadables/cat.c b/examples/loadables/cat.c
new file mode 100644
index 0000000..71685f3
--- /dev/null
+++ b/examples/loadables/cat.c
@@ -0,0 +1,138 @@
+/*
+ * cat replacement
+ *
+ * no options - the way cat was intended
+ */
+
+/*
+   Copyright (C) 1999-2009,2022 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash.
+   Bash is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Bash is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <fcntl.h>
+#include <errno.h>
+
+#include "builtins.h"
+#include "shell.h"
+
+#ifndef errno
+extern int errno;
+#endif
+
+extern char *strerror ();
+extern char **make_builtin_argv ();
+
+static int
+fcopy(fd, fn)
+int	fd;
+char	*fn;
+{
+	char	buf[4096], *s;
+	int	n, w, e;
+
+	while (n = read(fd, buf, sizeof (buf))) {
+		if (n < 0) {
+			e = errno;
+			write(2, "cat: read error: ", 18);
+			write(2, fn, strlen(fn));
+			write(2, ": ", 2);
+			s = strerror(e);
+			write(2, s, strlen(s));
+			write(2, "\n", 1);
+			return 1;
+		}
+		QUIT;
+		w = write(1, buf, n);
+		if (w != n) {
+			e = errno;
+			write(2, "cat: write error: ", 18);
+			s = strerror(e);
+			write(2, s, strlen(s));
+			write(2, "\n", 1);
+			return 1;
+		}
+		QUIT;
+	}
+	return 0;
+}
+
+int
+cat_main (argc, argv)
+int	argc;
+char	**argv;
+{
+	int	i, fd, r;
+	char	*s;
+
+	if (argc == 1)
+		return (fcopy(0, "standard input"));
+
+	for (i = r = 1; i < argc; i++) {
+		QUIT;
+		if (argv[i][0] == '-' && argv[i][1] == '\0')
+			fd = 0;
+		else {
+			fd = open(argv[i], O_RDONLY, 0666);
+			if (fd < 0) {
+				s = strerror(errno);
+				write(2, "cat: cannot open ", 17);
+				write(2, argv[i], strlen(argv[i]));
+				write(2, ": ", 2);
+				write(2, s, strlen(s));
+				write(2, "\n", 1);
+				continue;
+			}
+		}
+		r = fcopy(fd, argv[i]);
+		if (fd != 0)
+			close(fd);
+	}
+	QUIT;
+	return (r);
+}
+
+int
+cat_builtin(list)
+WORD_LIST *list;
+{
+	char	**v;
+	int	c, r;
+
+	v = make_builtin_argv(list, &c);
+	QUIT;
+	r = cat_main(c, v);
+	free(v);
+
+	return r;
+}
+
+char *cat_doc[] = {
+	"Display files.",
+	"",
+	"Read each FILE and display it on the standard output.   If any",
+	"FILE is `-' or if no FILE argument is given, the standard input",
+	"is read.",
+	(char *)0
+};
+
+struct builtin cat_struct = {
+	"cat",
+	cat_builtin,
+	BUILTIN_ENABLED,
+	cat_doc,
+	"cat [-] [file ...]",
+	0
+};