sha1sum.c - 9base - revived minimalist port of Plan 9 userland to Unix
HTML git clone git://git.suckless.org/9base
DIR Log
DIR Files
DIR Refs
DIR README
DIR LICENSE
---
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 }