ref: 12e226ac6798412271020d42645f69138715c519
dir: /utils/md5sum/md5sum.c/
#include <lib9.h> #include <libsec.h> #pragma varargck type "M" uchar* static int digestfmt(Fmt *fmt) { char buf[MD5dlen*2+1]; uchar *p; int i; p = va_arg(fmt->args, uchar*); for(i=0; i<MD5dlen; i++) sprint(buf+2*i, "%.2ux", p[i]); return fmtstrcpy(fmt, buf); } static void sum(int fd, char *name) { int n; uchar buf[8192], digest[MD5dlen]; DigestState *s; s = md5(nil, 0, nil, nil); while((n = read(fd, buf, sizeof buf)) > 0) md5(buf, n, nil, s); md5(nil, 0, digest, s); if(name == nil) print("%M\n", digest); else print("%M\t%s\n", digest, name); } void main(int argc, char *argv[]) { int i, fd; ARGBEGIN{ default: fprint(2, "usage: md5sum [file...]\n"); exits("usage"); }ARGEND fmtinstall('M', digestfmt); if(argc == 0) sum(0, nil); else for(i = 0; i < argc; i++){ fd = open(argv[i], OREAD); if(fd < 0){ fprint(2, "md5sum: can't open %s: %r\n", argv[i]); continue; } sum(fd, argv[i]); close(fd); } exits(nil); }