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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1992-2009 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* David Korn
* AT&T Bell Laboratories
*
* tee
*/
static const char usage[] =
"[-?\n@(#)$Id: tee (AT&T Research) 2009-06-19 $\n]"
USAGE_LICENSE
"[+NAME?tee - duplicate standard input]"
"[+DESCRIPTION?\btee\b copies standard input to standard output "
"and to zero or more files. The options determine whether "
"the specified files are overwritten or appended to. The "
"\btee\b utility does not buffer output. If writes to any "
"\afile\a fail, writes to other files continue although \btee\b "
"will exit with a non-zero exit status.]"
"[+?The number of \afile\a operands that can be specified is limited "
"by the underlying operating system.]"
"[a:append?Append the standard input to the given files rather "
"than overwriting them.]"
"[i:ignore-interrupts?Ignore SIGINT signal.]"
"[l:linebuffer?Set the standard output to be line buffered.]"
"\n"
"\n[file ...]\n"
"\n"
"[+EXIT STATUS?]{"
"[+0?All files copies successfully.]"
"[+>0?An error occurred.]"
"}"
"[+SEE ALSO?\bcat\b(1), \bsignal\b(3)]"
;
#include <cmd.h>
#include <ls.h>
#include <sig.h>
typedef struct Tee_s
{
Sfdisc_t disc;
int line;
int fd[1];
} Tee_t;
/*
* This discipline writes to each file in the list given in handle
*/
static ssize_t
tee_write(Sfio_t* fp, const void* buf, size_t n, Sfdisc_t* handle)
{
register const char* bp;
register const char* ep;
register int* hp = ((Tee_t*)handle)->fd;
register int fd = sffileno(fp);
register ssize_t r;
do
{
bp = (const char*)buf;
ep = bp + n;
while (bp < ep)
{
if ((r = write(fd, bp, ep - bp)) <= 0)
return -1;
bp += r;
}
} while ((fd = *hp++) >= 0);
return n;
}
static void
tee_cleanup(register Tee_t* tp)
{
register int* hp;
register int n;
if (tp)
{
sfdisc(sfstdout, NiL);
if (tp->line >= 0)
sfset(sfstdout, SF_LINE, tp->line);
for (hp = tp->fd; (n = *hp) >= 0; hp++)
close(n);
}
}
int
b_tee(int argc, register char** argv, void* context)
{
register Tee_t* tp = 0;
register int oflag = O_WRONLY|O_TRUNC|O_CREAT|O_BINARY;
register int n;
register int* hp;
register char* cp;
int line;
Sfdisc_t tee_disc;
if (argc <= 0)
{
if (context && (tp = (Tee_t*)sh_context(context)->data))
{
sh_context(context)->data = 0;
tee_cleanup(tp);
}
return 0;
}
cmdinit(argc, argv, context, ERROR_CATALOG, ERROR_CALLBACK);
line = -1;
for (;;)
{
switch (optget(argv, usage))
{
case 'a':
oflag &= ~O_TRUNC;
oflag |= O_APPEND;
continue;
case 'i':
signal(SIGINT, SIG_IGN);
continue;
case 'l':
line = sfset(sfstdout, 0, 0) & SF_LINE;
if ((line == 0) == (opt_info.num == 0))
line = -1;
else
sfset(sfstdout, SF_LINE, !!opt_info.num);
continue;
case ':':
error(2, "%s", opt_info.arg);
break;
case '?':
error(ERROR_usage(2), "%s", opt_info.arg);
break;
}
break;
}
if (error_info.errors)
error(ERROR_usage(2), "%s", optusage(NiL));
argv += opt_info.index;
argc -= opt_info.index;
#if _ANCIENT_BSD_COMPATIBILITY
if (*argv && streq(*argv, "-"))
{
signal(SIGINT, SIG_IGN);
argv++;
argc--;
}
#endif
if (argc > 0)
{
if (tp = (Tee_t*)stakalloc(sizeof(Tee_t) + argc * sizeof(int)))
{
memset(&tp->disc, 0, sizeof(tp->disc));
tp->disc.writef = tee_write;
if (context)
sh_context(context)->data = (void*)tp;
tp->line = line;
hp = tp->fd;
while (cp = *argv++)
{
if ((*hp = open(cp, oflag, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)) < 0)
error(ERROR_system(0), "%s: cannot create", cp);
else
hp++;
}
if (hp == tp->fd)
tp = 0;
else
{
*hp = -1;
sfdisc(sfstdout, &tp->disc);
}
}
else
error(ERROR_exit(0), "out of space");
}
if ((sfmove(sfstdin, sfstdout, SF_UNBOUND, -1) < 0 || !sfeof(sfstdin)) && errno != EPIPE)
error(ERROR_system(0), "read error");
if (sfsync(sfstdout))
error(ERROR_system(0), "write error");
tee_cleanup(tp);
return error_info.errors;
}
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