100 lines
1.5 KiB
C
100 lines
1.5 KiB
C
/*
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* cat replacement
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*
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* no options - the way cat was intended
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*/
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#include <fcntl.h>
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#include <errno.h>
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#include "builtins.h"
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#include "shell.h"
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#ifndef errno
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extern int errno;
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#endif
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extern char *strerror ();
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extern char **make_builtin_argv ();
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static int
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fcopy(fd)
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int fd;
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{
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char buf[1024], *s;
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int n, w, e;
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while (n = read(fd, buf, sizeof (buf))) {
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w = write(1, buf, n);
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if (w != n) {
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e = errno;
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write(2, "cat: write error: ", 18);
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s = strerror(e);
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write(2, s, strlen(s));
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write(2, "\n", 1);
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return 1;
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}
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}
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return 0;
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}
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cat_main (argc, argv)
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int argc;
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char **argv;
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{
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int i, fd, r;
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char *s;
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if (argc == 1)
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return (fcopy(0));
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for (i = r = 1; i < argc; i++) {
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if (argv[i][0] == '-' && argv[i][1] == '\0')
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fd = 0;
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else {
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fd = open(argv[i], O_RDONLY, 0666);
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if (fd < 0) {
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s = strerror(errno);
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write(2, "cat: cannot open ", 17);
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write(2, argv[i], strlen(argv[i]));
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write(2, ": ", 2);
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write(2, s, strlen(s));
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write(2, "\n", 1);
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continue;
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}
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}
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r = fcopy(fd);
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if (fd != 0)
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close(fd);
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}
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return (r);
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}
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cat_builtin(list)
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WORD_LIST *list;
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{
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char **v;
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int c, r;
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v = make_builtin_argv(list, &c);
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r = cat_main(c, v);
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free(v);
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return r;
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}
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char *cat_doc[] = {
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"Read each FILE and display it on the standard output. If any",
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"FILE is `-' or if no FILE argument is given, the standard input",
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"is read.",
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(char *)0
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};
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struct builtin cat_struct = {
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"cat",
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cat_builtin,
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BUILTIN_ENABLED,
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cat_doc,
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"cat [-] [file ...]",
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0
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};
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