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	sha1sum.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	sha1sum.c (982B)
	---
	1 #include <u.h>
	2 #include <libc.h>
	3 #include <bio.h>
	4 #include <libsec.h>
	5
	6 static int
	7 digestfmt(Fmt *fmt)
	8 {
	9 char buf[SHA1dlen*2+1];
	10 uchar *p;
	11 int i;
	12
	13 p = va_arg(fmt->args, uchar*);
	14 for(i=0; i<SHA1dlen; i++)
	15 sprint(buf+2*i, "%.2x", p[i]);
	16 return fmtstrcpy(fmt, buf);
	17 }
	18
	19 static void
	20 sum(int fd, char *name)
	21 {
	22 int n;
	23 uchar buf[8192], digest[SHA1dlen];
	24 DigestState *s;
	25
	26 s = sha1(nil, 0, nil, nil);
	27 while((n = read(fd, buf, sizeof buf)) > 0)
	28 sha1(buf, n, nil, s);
	29 sha1(nil, 0, digest, s);
	30 if(name == nil)
	31 print("%M\n", digest);
	32 else
	33 print("%M\t%s\n", digest, name);
	34 }
	35
	36 void
	37 main(int argc, char *argv[])
	38 {
	39 int i, fd;
	40
	41 ARGBEGIN{
	42 default:
	43 fprint(2, "usage: sha1sum [file...]\n");
	44 exits("usage");
	45 }ARGEND
	46
	47 fmtinstall('M', digestfmt);
	48
	49 if(argc == 0)
	50 sum(0, nil);
	51 else for(i = 0; i < argc; i++){
	52 fd = open(argv[i], OREAD);
	53 if(fd < 0){
	54 fprint(2, "sha1sum: can't open %s: %r\n", argv[i…
	55 continue;
	56 }
	57 sum(fd, argv[i]);
	58 close(fd);
	59 }
	60 exits(nil);
	61 }