Import sources from 2011-03-30 iso image

1 files changed, 109 insertions, 0 deletions

diff --git a/sys/src/cmd/chmod.c b/sys/src/cmd/chmod.c
new file mode 100755
index 000000000..425f8efce
--- /dev/null
+++ b/sys/src/cmd/chmod.c
@@ -0,0 +1,109 @@
+#include <u.h>
+#include <libc.h>
+
+#define U(x) (x<<6)
+#define G(x) (x<<3)
+#define O(x) (x)
+#define A(x) (U(x)|G(x)|O(x))
+
+#define DMRWE (DMREAD|DMWRITE|DMEXEC)
+
+int parsemode(char *, ulong *, ulong *);
+
+void
+main(int argc, char *argv[])
+{
+	int i;
+	Dir *dir, ndir;
+	ulong mode, mask;
+	char *p;
+
+	if(argc < 3){
+		fprint(2, "usage: chmod 0777 file ... or chmod [who]op[rwxalt] file ...\n");
+		exits("usage");
+	}
+	mode = strtol(argv[1], &p, 8);
+	if(*p == 0)
+		mask = A(DMRWE);
+	else if(!parsemode(argv[1], &mask, &mode)){
+		fprint(2, "chmod: bad mode: %s\n", argv[1]);
+		exits("mode");
+	}
+	nulldir(&ndir);
+	for(i=2; i<argc; i++){
+		dir = dirstat(argv[i]);
+		if(dir == nil){
+			fprint(2, "chmod: can't stat %s: %r\n", argv[i]);
+			continue;
+		}
+		ndir.mode = (dir->mode & ~mask) | (mode & mask);
+		free(dir);
+		if(dirwstat(argv[i], &ndir)==-1){
+			fprint(2, "chmod: can't wstat %s: %r\n", argv[i]);
+			continue;
+		}
+	}
+	exits(0);
+}
+
+int
+parsemode(char *spec, ulong *pmask, ulong *pmode)
+{
+	ulong mode, mask;
+	int done, op;
+	char *s;
+
+	s = spec;
+	mask = DMAPPEND | DMEXCL | DMTMP;
+	for(done=0; !done; ){
+		switch(*s){
+		case 'u':
+			mask |= U(DMRWE); break;
+		case 'g':
+			mask |= G(DMRWE); break;
+		case 'o':
+			mask |= O(DMRWE); break;
+		case 'a':
+			mask |= A(DMRWE); break;
+		case 0:
+			return 0;
+		default:
+			done = 1;
+		}
+		if(!done)
+			s++;
+	}
+	if(s == spec)
+		mask |= A(DMRWE);
+	op = *s++;
+	if(op != '+' && op != '-' && op != '=')
+		return 0;
+	mode = 0;
+	for(; *s ; s++){
+		switch(*s){
+		case 'r':
+			mode |= A(DMREAD); break;
+		case 'w':
+			mode |= A(DMWRITE); break;
+		case 'x':
+			mode |= A(DMEXEC); break;
+		case 'a':
+			mode |= DMAPPEND; break;
+		case 'l':
+			mode |= DMEXCL; break;
+		case 't':
+			mode |= DMTMP; break;
+		default:
+			return 0;
+		}
+	}
+	if(*s != 0)
+		return 0;
+	if(op == '+' || op == '-')
+		mask &= mode;
+	if(op == '-')
+		mode = ~mode;
+	*pmask = mask;
+	*pmode = mode;
+	return 1;
+}