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;
}
/* 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);
}
