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/*
* 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 <config.h>
#include <fcntl.h>
#include <errno.h>
#include "builtins.h"
#include "shell.h"
#ifndef errno
extern int errno;
#endif
extern char *strerror (int);
extern char **make_builtin_argv (WORD_LIST *, int *);
static int
fcopy(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 (int argc, char **argv)
{
int i, fd, r, closefd;
char *s;
if (argc == 1)
return (fcopy(0, "standard input"));
for (i = 1, r = 0; i < argc; i++) {
QUIT;
if (argv[i][0] == '-' && argv[i][1] == '\0') {
fd = 0;
closefd = 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);
r++;
continue;
}
closefd = 1;
}
r += fcopy(fd, argv[i]);
if (closefd)
close(fd);
}
QUIT;
return (r);
}
int
cat_builtin(WORD_LIST *list)
{
char **v;
int c, r;
v = make_builtin_argv(list, &c);
QUIT;
r = cat_main(c, v);
free(v);
return r; /* relies on EXECUTION_SUCCESS being 0 */
}
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
};
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