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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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#include <regexp.h>
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#include "hash.h"
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Hash hash;
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void
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usage(void)
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{
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	fprint(2, "addhash [-o out] file scale [file scale]...\n");
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	exits("usage");
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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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	int i, fd, n;
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	char err[ERRMAX], *out;
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	Biobuf *b, bout;
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	out = nil;
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	ARGBEGIN{
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	case 'o':
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		out = EARGF(usage());
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		break;
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	default:
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		usage();
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	}ARGEND;
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	if(argc==0 || argc%2)
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		usage();
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	while(argc > 0){
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		if((b = Bopenlock(argv[0], OREAD)) == nil)
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			sysfatal("open %s: %r", argv[0]);
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		n = atoi(argv[1]);
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		if(n == 0)
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			sysfatal("0 scale given");
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		Breadhash(b, &hash, n);
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		Bterm(b);
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		argv += 2;
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		argc -= 2;
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	}
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	fd = 1;
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	if(out){
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		for(i=0; i<120; i++){
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			if((fd = create(out, OWRITE, 0666|DMEXCL)) >= 0)
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				break;
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			rerrstr(err, sizeof err);
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			if(strstr(err, "file is locked")==nil && strstr(err, "exclusive lock")==nil)
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				break;
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			sleep(1000);
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		}
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		if(fd < 0)
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			sysfatal("could not open %s: %r", out);
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	}
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	Binit(&bout, fd, OWRITE);
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	Bwritehash(&bout, &hash);
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	Bterm(&bout);
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	exits(0);
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}
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