nstr NSys::stripPath(const nstr& path){
size_t offset = 0;
for(size_t i = path.length() - 1; i > 0; --i){
if(path[i] == '/'){
++offset;
}
else{
break;
}
}
return path.substr(0, path.length() - offset);
}
void write(const nstr& in){
if(ifd_ < 0){
NERROR("command was not started with input mode");
}
int n = ::write(ifd_, in.c_str(), in.length());
if(n < 0){
NERROR("error while writing");
}
}
nstr NSys::basename(const nstr& path){
nstr ret;
for(int i = path.length() - 1; i >= 0; --i){
if(path[i] == '/'){
break;
}
ret.insert(0, 1, path[i]);
}
return ret;
}
void NSys::replaceEnvs(nstr& s){
size_t len = s.length();
for(size_t i = 0; i < len; ++i){
if(s[i] == '$' &&
(i == 0 || s[i - 1] != '\\') &&
(i < len && s[i + 1] == '(')){
size_t begin = i;
i += 2;
nstr env;
bool fin = false;
for(; i < len; ++i){
if(s[i] == ')'){
fin = true;
break;
}
env += s[i];
}
if(!fin){
NERROR("unterminated environment variable");
}
nstr v;
if(!getEnv(env, v)){
NERROR("invalid environment variable: " + env);
}
s.replace(begin, i - begin + 1, v);
i = begin + v.length();
len = s.length();
}
}
}