I am required to read from an keyboard(stdin), the following text. Pl note that it will be entered by user from keyboard in this format only.
#the total size of physical memory (units are B, KB, MB, GB)
512MB 2 #the following are memory allocations
{
abc = alloc(1KB);
{
y_ = alloc(128MB);
x1= alloc(128MB);
y_ = alloc(32MB);
for (i = 0; i < 256; i++) abc[i] =alloc(512kB);
x1 = alloc(32MB); x2 = alloc(32MB); x3 = alloc(32MB);
x1.next = x2, x2.next = x3, x3.next = x1;
}
abc = alloc(256MB);
}
So basically let me break it down. a line beginning with # sign is considered as comment and is ignored. the first two allocations are physical memory size and number of generations. a global bracket will be opened. and it may be followed by a line called
abc = alloc(1KB);
where abc is the object name, 1KB is the memory size allocated.
x1.next = x2, here x1 points to x2.
for (i = 0; i < 256; i++) abc[i] =alloc(512kB);
the for loop os entered in this format and it can have a same line command or can have nested for loops.
I have the following code that takes care of this somewhat. I want to know improve on it. Please do help.
And my code is this:
#include <iostream>
#include <algorithm>
#include <string>
#include <iomanip>
#include <limits>
#include <stdio.h>
#include <sstream>
using namespace std;
using std::stringstream;
string pMem,sGen, comment,val,input,input_for,id_size,id,init_str1, init_str2, inc_str, id_dummy,s_out,sss, id_dummy1;
int gen=0, pMem_int=0,i=0, gBrckt =0,cBrckt=0, oBrckt=0, id_size_int,v1,v2, for_oBrckt=0,for_cBrckt=0,y=0, y1=0, g=0;
unsigned long pMem_ulong =0, id_size_ulong;
char t[20], m[256], init1[10],init2[10],inc[10];
unsigned pos_start, pos,pos_strt=0,pos_end=0;
string extract(string pMem_extract);
unsigned long toByte(int pMem_int_func, string val);
void commentIgnore(string& input);
void func_insert();
void func_insert_for();
stringstream out;
void commentIgnore_for(string& input_for);
int main()
{
/* Reading the input main memory and num of generations */
/* Ignoring comment line */
cin >> pMem;
if(pMem == "#") {
cin.clear();
pMem.clear();
getline(cin,comment);
cin >> pMem;
}
if(pMem == "#") {
cin.clear();
pMem.clear();
getline(cin,comment);
cin >> pMem;
}
if(pMem == "#") {
cin.clear();
pMem.clear();
getline(cin,comment);
cin >> pMem;
}
/* Reading input generations */
cin>> sGen;
if(sGen == "#") {
cin.clear();
sGen.clear();
getline(cin,comment);
cin >> sGen;
}
if(sGen == "#") {
cin.clear();
sGen.clear();
getline(cin,comment);
cin >> sGen;
}
if(sGen == "#") {
cin.clear();
sGen.clear();
getline(cin,comment);
cin >> sGen;
}
/* Convert sGen and physical memory to int and report error if not a number */
gen = atoi(sGen.c_str());
if(gen ==0) {
cerr << "Generation must be a number"<<endl;
exit(0);
}
pMem_int = atoi(pMem.c_str());
// cout<< gen<<" "<<pMem_int<<endl;
/* Now that the number from pMem is removed, get its unit B,MB,KB */
extract(pMem); /* returns val(string) */
/* convert the given physical memory to Byte. input: pMem_int*/
toByte(pMem_int, val); /* return(pMem_ulong)*/
// move pMem_ulond to another location to keep address intact
/* read rest of the inputs */
/* Ignore comment lines before the global bracket */
cin >> input;
if(input == "#"){
cin.clear();
input.clear();
getline(cin,comment);
cin >> input;
}
if(input == "#"){
cin.clear();
input.clear();
getline(cin,comment);
cin >> input;
}
if(input == "#"){
cin.clear();
input.clear();
getline(cin,comment);
cin >> input;
}
if(input.compare("{") ==0)
gBrckt=1;
else {
cerr<< "Syntax error\n";
exit(0);
}
/* Clearing the input stream for next input */
cin.ignore(numeric_limits<streamsize>::max(), '\n');
cin.clear();
input.clear();
//cout<<"input: "<<input<<endl;
while( getline(cin,input)) {
if(input == "CTRL-D")
break;
commentIgnore(input);
//cout<<"inputloop: "<<input<<endl;
/* If input = '{' or '}'*/
if(input.compare("{") ==0)
oBrckt = oBrckt + 1;
if (input.compare("}") ==0)
cBrckt = cBrckt + 1;
if (((input.find("alloc"))!= string::npos) && (input.find("alloc") < input.find("for"))) {
func_insert();
//call the allocate function here with name: id, size: id_size_ulong
}
if ((input.find("for")) != string::npos) {
sscanf(input.c_str(), "for (%s = %d; %s < %d; %[^)])", init1, &v1, init2, &v2, inc);
init_str1 = init1, init_str2 = init2, inc_str = inc;
cout<<init1<<" ="<< v1<<" "<<init_str1<<" < " << v2<< " "<< inc_str<<endl;
cout << input <<endl;
if(init_str1 != init_str2) {
cerr << "Error!\n";
exit(0);
}
if ((input.find("alloc"))!= string::npos) {
// unsigned pos = (input.find("alloc"));
if((input.find(";")) != string::npos) {
pos_start = (input.find(")")+1);
string alloc_substr = input.substr(pos_start);
cout<<"Substring alloc: "<< alloc_substr<<endl;
func_insert();
//call the allocate function here with name: id, size: id_size_ulong
}
else {
cerr << "ERROR: SYNTAX\n";
exit(0);
}
}
// cin.ignore();
while(getline(cin,input_for)) {
commentIgnore_for(input_for);
if ((input_for.find("{") != string::npos)) {
pos = input_for.find("{");
for_oBrckt = for_oBrckt+1;
string for_brckt = input_for.substr(pos,pos);
cout<< "Found: " << for_oBrckt<<endl;
}
if ((input_for.find("}") != string::npos)) {
pos = input_for.find("}");
for_cBrckt = for_cBrckt+1;
string for_brckt = input_for.substr(pos,pos);
cout<< "Found: " << for_cBrckt<<endl;
}
if (((input_for.find("alloc"))!= string::npos) && (input_for.find("alloc") < input_for.find("for"))) {
func_insert_for();
//call the allocate function here with name: id, size: id_size_ulong
}
if(for_oBrckt == for_cBrckt)
break;
}
cout<<"out of break"<<endl;
}
if (((input.find(".next"))!= string::npos) && (input.find(".next") < input.find("for"))) {
func_insert();
//call the allocate function here with name: id, size: id_size_ulong
}
if(((cBrckt-oBrckt)) == gBrckt)
break;
}
}
/*---------------------- Function definitions --------------------------------*/
/* Function to extract the string part of physical memory */
string extract(string pMem_extract) {
i=0;
const char *p = pMem_extract.c_str();
for(i=0; i<=(pMem_extract.length()); i++) {
if (*p=='0'|| *p=='1'|| *p=='2'|| *p=='3'|| *p =='4'|| *p=='5'|| *p=='6'|| *p=='7'|| *p=='8'|| *p=='9')
*p++;
else {
val = pMem_extract.substr(i);
return(val);
}
}
}
/* Convert the physical memory to bytes. return(pMem_ulong);*/
unsigned long toByte(int pMem_int_func, string val)
{
if (val == "KB")
pMem_ulong = (unsigned long) pMem_int_func * 1024;
else if (val == "B")
pMem_ulong = (unsigned long) pMem_int_func;
else if (val == "GB")
pMem_ulong = (unsigned long) pMem_int_func * 1073741824;
else if (val == "MB")
pMem_ulong = (unsigned long) pMem_int_func * 1048576;
else {
cerr<<"Missing the value in memory, B, KB, MB, GB\n";
exit(0);
}
return(pMem_ulong);
}
/*Ignoring comment line*/
void commentIgnore(string& input)
{
unsigned found = input.find('#');
if (found!=std::string::npos)
input= input.erase(found);
else
return;
return;
}
void func_insert() {
sscanf(input.c_str(), "%s = alloc(%[^)]);", t, m);
id =t;
id_size =m;
cout<<"Tag: "<<id <<" Memory: "<<id_size<<endl;
extract(id_size); /* Separates B,MB,KB and GB of input, returns val*/
id_size_int = atoi(id_size.c_str());
/* Convert object size to B */
toByte(id_size_int, val); /* return(pMem_ulong) */
id_size_ulong = pMem_ulong;
}
void func_insert_for() {
sscanf(input_for.c_str(), "%s = alloc(%[^)]);", t, m);
id =t;
id_size =m;
if(!((id.find("[")) && (id.find("]")) != string::npos)) {
cout<<"Tag: "<<id <<" Memory: "<<id_size<<endl;
extract(id_size); /* Separates B,MB,KB and GB of input, returns val*/
id_size_int = atoi(id_size.c_str());
/* Convert object size to B */
toByte(id_size_int, val); /* return(pMem_ulong) */
id_size_ulong = pMem_ulong;
// allocate here
return;
}
else {
if(inc_str.find("++"))
y1 =1;
if(inc_str.find("="))
{
sss = inc_str.substr(inc_str.find("+") +1);
y1 = atoi(sss.c_str());
cout<<"y1:"<<y1<<endl;
}
pos_strt = id.find("[");
pos_end = id.find("]") -1;
cout<<"Positions start and ebd: " << pos_strt<<pos_end<<endl;
id_dummy = id.substr(0,pos_strt);
id = id_dummy;
cout<<"Tag: "<<id_dummy <<" Memory: "<<id_size<<endl;
extract(id_size); /* Separates B,MB,KB and GB of input, returns val*/
id_size_int = atoi(id_size.c_str());
/* Convert object size to B */
toByte(id_size_int, val); /* return(pMem_ulong) */
id_size_ulong = pMem_ulong;
//allocate here
cout<<"v1: " << v1 << " " << v2<<endl;
// g = 0;
for(y = v1; y < v2; y= y+y1) {
// allocate here
}
}
return;
}
void commentIgnore_for(string& input_for)
{
unsigned found = input_for.find('#');
if (found!=std::string::npos)
input_for= input_for.erase(found);
else
return;
return;
}