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WebSVN – planix.SVN – Blame – /os/branches/feature_posix/sys/lib/dist/cmd/cdsh.c – Rev 2

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/*
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 * The `cd' shell.
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 * Just has cd and lc.
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 */
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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char *pwd;
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char *root = "/";
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void
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usage(void)
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{
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	fprint(2, "usage: cdsh [-r root]\n");
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	exits("usage");
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}
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int
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system(char *cmd)
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{
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	int pid;
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	if((pid = fork()) < 0)
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		return -1;
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	if(pid == 0) {
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		dup(2, 1);
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		execl("/bin/rc", "rc", "-c", cmd, nil);
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		exits("exec");
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	}
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	waitpid();
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	return 0;
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}
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int
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cd(char *s)
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{
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	char *newpwd;
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	int l;
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	if(s[0] == '/') {
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		cleanname(s);
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		newpwd = strdup(s);
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	} else {
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		l = strlen(pwd)+1+strlen(s)+1+50;	/* 50 = crud for unicode mistakes */
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		newpwd = malloc(l);
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		snprint(newpwd, l, "%s/%s", pwd, s);
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		cleanname(newpwd);
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		assert(newpwd[0] == '/');
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	}
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	if(chdir(root) < 0 || (newpwd[1] != '\0' && chdir(newpwd+1) < 0)) {
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		chdir(root);
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		chdir(pwd+1);
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		free(newpwd);
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		return -1;
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	} else {
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		free(pwd);
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		pwd = newpwd;
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		return 0;
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	}
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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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	char *p;
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	Biobuf bin;
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	char *f[2];
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	int nf;
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	ARGBEGIN{
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	case 'r':
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		root = ARGF();
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		if(root == nil)
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			usage();
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		if(root[0] != '/') {
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			fprint(2, "root must be rooted\n");
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			exits("root");
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		}
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		break;
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	default:
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		usage();
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	}ARGEND;
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	if(argc != 0)
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		usage();
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	cleanname(root);
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	if(cd("/") < 0) {
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		fprint(2, "cannot cd %s: %r\n", root);
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		exits("root");
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	}
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	Binit(&bin, 0, OREAD);
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	while(fprint(2, "%s%% ", pwd), (p = Brdline(&bin, '\n'))) {
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		p[Blinelen(&bin)-1] = '\0';
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		nf = tokenize(p, f, nelem(f));
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		if(nf < 1)
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			continue;
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		if(strcmp(f[0], "exit") == 0)
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			break;
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		if(strcmp(f[0], "lc") == 0) {
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			if(nf == 1) {
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				if(system("/bin/lc") < 0)
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					fprint(2, "lc: %r\n");
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			} else if(nf == 2) {
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				if(strpbrk(p, "'`{}^@$#&()|\\;><"))
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					fprint(2, "no shell characters allowed\n");
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				else {
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					p = f[1];
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					*--p = ' ';
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					*--p = 'c';
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					*--p = 'l';
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					if(system(p) < 0)
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						fprint(2, "lc: %r\n");
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				}
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			}
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			continue;
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		}
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		if(strcmp(f[0], "cd") == 0) {
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			if(nf < 2)
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				fprint(2, "usage: cd dir\n");
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			else if(cd(f[1]) < 0)
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				fprint(2, "cd: %r\n");
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			continue;
128 
		}
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		fprint(2, "commands are cd, lc, and exit\n");
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	}
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	print("%s\n", pwd);
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}