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/* tee.c - cat to multiple outputs.
*
* Copyright 2008 Rob Landley <rob@landley.net>
*
* See http://opengroup.org/onlinepubs/9699919799/utilities/tee.html
USE_TEE(NEWTOY(tee, "ia", TOYFLAG_USR|TOYFLAG_BIN))
config TEE
bool "tee"
default y
help
usage: tee [-ai] [file...]
Copy stdin to each listed file, and also to stdout.
Filename "-" is a synonym for stdout.
-a Append to files
-i Ignore SIGINT
*/
#define FOR_tee
#include "toys.h"
GLOBALS(
void *outputs;
)
struct fd_list {
struct fd_list *next;
int fd;
};
// Open each output file, saving filehandles to a linked list.
static void do_tee_open(int fd, char *name)
{
struct fd_list *temp;
temp = xmalloc(sizeof(struct fd_list));
temp->next = TT.outputs;
temp->fd = fd;
TT.outputs = temp;
}
void tee_main(void)
{
if (FLAG(i)) xsignal(SIGINT, SIG_IGN);
// Open output files
loopfiles_rw(toys.optargs,
O_RDWR|O_CREAT|WARN_ONLY|(FLAG(a)?O_APPEND:O_TRUNC),
0666, do_tee_open);
for (;;) {
struct fd_list *fdl;
int len, out = 0;
// Read data from stdin
len = xread(0, toybuf, sizeof(toybuf));
if (len<1) break;
// Write data to each output file, plus stdout.
for (fdl = TT.outputs; ;fdl = fdl->next) {
if (!fdl && out) break;
if (len != writeall(fdl ? fdl->fd : 1, toybuf, len)) toys.exitval=1;
if (!fdl) break;
if (fdl->fd == 1) out++;
}
}
}
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