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67 lines
1.4 KiB
67 lines
1.4 KiB
4 months ago
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/* tee.c - cat to multiple outputs.
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*
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* Copyright 2008 Rob Landley <rob@landley.net>
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*
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* See http://opengroup.org/onlinepubs/9699919799/utilities/tee.html
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USE_TEE(NEWTOY(tee, "ia", TOYFLAG_USR|TOYFLAG_BIN))
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config TEE
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bool "tee"
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default y
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help
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usage: tee [-ai] [FILE...]
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Copy stdin to each listed file, and also to stdout.
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Filename "-" is a synonym for stdout.
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-a Append to files
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-i Ignore SIGINT
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*/
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#define FOR_tee
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#include "toys.h"
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GLOBALS(
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void *outputs;
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int out;
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)
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struct fd_list {
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struct fd_list *next;
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int fd;
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};
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// Open each output file, saving filehandles to a linked list.
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static void do_tee_open(int fd, char *name)
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{
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struct fd_list *temp;
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temp = xmalloc(sizeof(struct fd_list));
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temp->next = TT.outputs;
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if (1 == (temp->fd = fd)) TT.out++;
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TT.outputs = temp;
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}
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void tee_main(void)
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{
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struct fd_list *fdl;
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int len;
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if (FLAG(i)) xsignal(SIGINT, SIG_IGN);
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// Open output files (plus stdout if not already in output list)
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loopfiles_rw(toys.optargs,
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O_RDWR|O_CREAT|WARN_ONLY|(FLAG(a)?O_APPEND:O_TRUNC),
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0666, do_tee_open);
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if (!TT.out) do_tee_open(1, 0);
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// Read data from stdin, write to each output file.
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for (;;) {
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if (1>(len = xread(0, toybuf, sizeof(toybuf)))) break;
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for (fdl = TT.outputs; fdl;fdl = fdl->next)
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if (len != writeall(fdl->fd, toybuf, len)) toys.exitval = 1;
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}
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}
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