119 lines
2.3 KiB
C
119 lines
2.3 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <lib9.h>
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#define U(x) (x<<6)
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#define G(x) (x<<3)
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#define O(x) (x)
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#define A(x) (U(x)|G(x)|O(x))
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#define DMRWE (DMREAD|DMWRITE|DMEXEC)
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int parsemode(char *, uint32_t *, uint32_t *);
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void
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main(int argc, char *argv[])
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{
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int i;
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Dir *dir, ndir;
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uint32_t mode, mask;
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char *p;
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if(argc < 3){
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fprint(2, "usage: chmod 0777 file ... or chmod [who]op[rwxalt] file ...\n");
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exits("usage");
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}
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mode = strtol(argv[1], &p, 8);
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if(*p == 0)
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mask = A(DMRWE);
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else if(!parsemode(argv[1], &mask, &mode)){
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fprint(2, "chmod: bad mode: %s\n", argv[1]);
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exits("mode");
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}
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nulldir(&ndir);
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for(i=2; i<argc; i++){
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dir = dirstat(argv[i]);
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if(dir == nil){
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fprint(2, "chmod: can't stat %s: %r\n", argv[i]);
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continue;
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}
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ndir.mode = (dir->mode & ~mask) | (mode & mask);
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free(dir);
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if(dirwstat(argv[i], &ndir)==-1){
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fprint(2, "chmod: can't wstat %s: %r\n", argv[i]);
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continue;
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}
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}
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exits(0);
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}
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int
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parsemode(char *spec, uint32_t *pmask, uint32_t *pmode)
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{
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uint32_t mode, mask;
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int done, op;
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char *s;
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s = spec;
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mask = DMAPPEND | DMEXCL | DMTMP;
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for(done=0; !done; ){
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switch(*s){
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case 'u':
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mask |= U(DMRWE); break;
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case 'g':
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mask |= G(DMRWE); break;
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case 'o':
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mask |= O(DMRWE); break;
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case 'a':
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mask |= A(DMRWE); break;
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case 0:
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return 0;
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default:
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done = 1;
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}
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if(!done)
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s++;
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}
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if(s == spec)
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mask |= A(DMRWE);
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op = *s++;
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if(op != '+' && op != '-' && op != '=')
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return 0;
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mode = 0;
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for(; *s ; s++){
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switch(*s){
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case 'r':
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mode |= A(DMREAD); break;
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case 'w':
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mode |= A(DMWRITE); break;
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case 'x':
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mode |= A(DMEXEC); break;
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case 'a':
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mode |= DMAPPEND; break;
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case 'l':
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mode |= DMEXCL; break;
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case 't':
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mode |= DMTMP; break;
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default:
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return 0;
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}
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}
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if(*s != 0)
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return 0;
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if(op == '+' || op == '-')
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mask &= mode;
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if(op == '-')
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mode = ~mode;
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*pmask = mask;
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*pmode = mode;
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return 1;
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}
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