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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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char *argv0;
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int
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openlog(char *name)
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{
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	int fd;
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	fd = open(name, OWRITE);
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	if(fd < 0){
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		fprint(2, "%s: can't open %s: %r\n", argv0, name);
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		return -1;
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	}
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	seek(fd, 0, 2);
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	return fd;
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}
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void
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main(int argc, char **argv)
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{
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	Biobuf in;
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	int fd;
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	char *p, *t;
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	char buf[8192];
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	argv0 = argv[0];
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	if(argc != 4){
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		fprint(2, "usage: %s console logfile prefix\n", argv0);
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		exits("usage");
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	}
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	fd = open(argv[1], OREAD);
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	if(fd < 0){
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		fprint(2, "%s: can't open %s: %r\n", argv0, argv[1]);
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		exits("open");
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	}
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	Binit(&in, fd, OREAD);
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	fd = openlog(argv[2]);
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	for(;;){
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		if(p = Brdline(&in, '\n')){
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			p[Blinelen(&in)-1] = 0;
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			if(fprint(fd, "%s: %s\n", argv[3], p) < 0){
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				close(fd);
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				fd = openlog(argv[2]);
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				fprint(fd, "%s: %s\n", t, p);
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			}
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		} else if(Blinelen(&in) == 0)	// true eof
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			break;
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		else {
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			Bread(&in, buf, sizeof buf);
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		}
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	}
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	exits(0);
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}