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-rw-r--r--examples/loadables/cat.c138
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
+};