71 lines
1.2 KiB
C
71 lines
1.2 KiB
C
#include <u.h>
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#include <libc.h>
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#include <libsec.h>
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#pragma varargck type "M" uchar*
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static char exitstr[ERRMAX];
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static int
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digestfmt(Fmt *fmt)
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{
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char buf[MD5dlen*2+1];
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uchar *p;
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int i;
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p = va_arg(fmt->args, uchar*);
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for(i=0; i<MD5dlen; i++)
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sprint(buf+2*i, "%.2ux", p[i]);
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return fmtstrcpy(fmt, buf);
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}
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static void
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sum(int fd, char *name)
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{
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int n;
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uchar buf[8192], digest[MD5dlen];
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DigestState *s;
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s = md5(nil, 0, nil, nil);
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while((n = read(fd, buf, sizeof buf)) > 0)
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md5(buf, n, nil, s);
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if(n < 0){
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snprint(exitstr, sizeof(exitstr), "reading %s: %r\n", name ? name : "stdin");
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fprint(2, "%s", exitstr);
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return;
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}
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md5(nil, 0, digest, s);
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if(name == nil)
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print("%M\n", digest);
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else
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print("%M\t%s\n", digest, name);
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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;
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ARGBEGIN{
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default:
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fprint(2, "usage: md5sum [file...]\n");
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exits("usage");
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}ARGEND
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fmtinstall('M', digestfmt);
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if(argc == 0)
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sum(0, nil);
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else for(i = 0; i < argc; i++){
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fd = open(argv[i], OREAD);
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if(fd < 0){
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snprint(exitstr, sizeof(exitstr), "can't open %s: %r", argv[i]);
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fprint(2, "%s: %s\n", argv0, exitstr);
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continue;
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}
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sum(fd, argv[i]);
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close(fd);
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}
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exits(exitstr);
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}
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