Viewing file:  cat.c (1.49 KB) -rw-r--r--
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/*
* cat replacement
*
* no options - the way cat was intended
*/
#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)
int fd;
{
char buf[1024], *s;
int n, w, e;
while (n = read(fd, buf, sizeof (buf))) {
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;
}
}
return 0;
}
cat_main (argc, argv)
int argc;
char **argv;
{
int i, fd, r;
char *s;
if (argc == 1)
return (fcopy(0));
for (i = r = 1; i < argc; i++) {
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);
if (fd != 0)
close(fd);
}
return (r);
}
cat_builtin(list)
WORD_LIST *list;
{
char **v;
int c, r;
v = make_builtin_argv(list, &c);
r = cat_main(c, v);
free(v);
return r;
}
char *cat_doc[] = {
"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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