示例#1
0
int main(int argc, char **argv){
	int a = 1, b = 0;
	size_t l;
	char *path, *p, *pp;
	struct stat sbuf;
	struct dirent *direntp;
	DIR *dirp;
	if(argc == 1)
		return -1;
	if(!strcmp(argv[a], "-a")){
		a++;
		b++;
	}



	if((path = getenv("PATH")) == NULL){
		perror("no path defined");
		return -1;
	}
	l = strlen(p)+1;
	p = malloc(sizeof(char)*strlen(path)*2);
	pp = malloc(sizeof(char)*strlen(path)*2);
	p = strtok(path, ":");
	while((p != NULL)){
		if((!stat(p, &sbuf)) && (S_ISDIR(sbuf.st_mode))){
			if((dirp = opendir(p)) == NULL)
				return -1;
			while((direntp = readdir(dirp)) != NULL){
				if(strcmp(direntp->d_name, argv[a]) == 0){
					if((pp = realloc(pp,sizeof(direntp->d_name)+sizeof(p)*2)) == NULL)
						return -1;
					sprintf(pp, "%s/%s",p,direntp->d_name);
					if(checkexecutable(pp)){
						fprintf(stdout, "%s\n",pp);
						if(b)
							break;
						return 0;
					}
				}
			}
		}
		p = strtok(NULL, ":");
	}
	return 0;
}
示例#2
0
文件: eval.c 项目: Dioxylin/es-shell
/* eval -- evaluate a list, producing a list */
extern List *eval(List *list0, Binding *binding0, int flags) {
	Closure *volatile cp;
	List *fn;

	if (++evaldepth >= maxevaldepth)
		fail("es:eval", "max-eval-depth exceeded");

	Ref(List *, list, list0);
	Ref(Binding *, binding, binding0);
	Ref(char *, funcname, NULL);

restart:
	if (list == NULL) {
		RefPop3(funcname, binding, list);
		--evaldepth;
		return true;
	}
	assert(list->term != NULL);

	if ((cp = getclosure(list->term)) != NULL) {
		switch (cp->tree->kind) {
		    case nPrim:
			assert(cp->binding == NULL);
			list = prim(cp->tree->u[0].s, list->next, binding, flags);
			break;
		    case nThunk:
			list = walk(cp->tree->u[0].p, cp->binding, flags);
			break;
		    case nLambda:
			ExceptionHandler

				Push p;
				Ref(Tree *, tree, cp->tree);
				Ref(Binding *, context,
					       bindargs(tree->u[0].p,
							list->next,
							cp->binding));
				if (funcname != NULL)
					varpush(&p, "0",
						    mklist(mkterm(funcname,
								  NULL),
							   NULL));
				list = walk(tree->u[1].p, context, flags);
				if (funcname != NULL)
					varpop(&p);
				RefEnd2(context, tree);
	
			CatchException (e)

				if (termeq(e->term, "return")) {
					list = e->next;
					goto done;
				}
				throw(e);

			EndExceptionHandler
			break;
		    case nList: {
			list = glom(cp->tree, cp->binding, TRUE);
			list = append(list, list->next);
			goto restart;
		    }
		    default:
			panic("eval: bad closure node kind %d",
			      cp->tree->kind);
		    }
		goto done;
	}

	/* the logic here is duplicated in $&whatis */

	Ref(char *, name, getstr(list->term));
	fn = varlookup2("fn-", name, binding);
	if (fn != NULL) {
		funcname = name;
		list = append(fn, list->next);
		RefPop(name);
		goto restart;
	}
	if (isabsolute(name)) {
		char *error = checkexecutable(name);
		if (error != NULL)
			fail("$&whatis", "%s: %s", name, error);
		list = forkexec(name, list, flags & eval_inchild);
		RefPop(name);
		goto done;
	}
	RefEnd(name);

	fn = pathsearch(list->term);
	if (fn != NULL && fn->next == NULL
	    && (cp = getclosure(fn->term)) == NULL) {
		char *name = getstr(fn->term);
		list = forkexec(name, list, flags & eval_inchild);
		goto done;
	}

	list = append(fn, list->next);
	goto restart;

done:
	--evaldepth;
	if ((flags & eval_exitonfalse) && !istrue(list))
		exit(exitstatus(list));
	RefEnd2(funcname, binding);
	RefReturn(list);
}