I posted this here one day ago but it seems like it hasn't been put up
for some unknown reason. That gives me a chance to say things a bit
better in this post.
1st of all let's desribe the problem: In ParamGenerate() I want to
find all whitespaces before a certain point in one string. Thus I use
the string::find() function. However it seems like this function
ignores some whitespaces :/ This is really weird and I need your help.
Okay since the function ParamGenerate() itself isn't compilable, I
want to include the least compilable code which I wouldn't say is too
big :) But you gotta understand the purpose of my program so you can
understand better what I'm trying to do in ParamGenerate(). My program
will receive input in the following format:
[ <prefix> ] <COMMAND> <middle param> <middle param> ... <middle
param> <final param>
So the <prefix> is optional (and if inserted is a colon ':') and we
can have MANY <middle param>s (that must not include a colon ':' or a
space ' ') and just one <final param> (which starts with a ':' and can
contain spaces).
I just want to do that kind of seperation to my input with
ParamGenerate() (I remove the leading colon before calling
ParamGenerate()). However my ParamGenerate() seems to misfunction and
I think that this is caused by the find() function.
<btw> I have also tried implementing the ParamGenerate() function by
going through all the characters in the string and checking if they're
a space but I still have the same problem </btw>
<btw 2> Also in ParamGenerate() if I try to resize the vector to the
result of ParamCount() I get a segfault :/ This is the command I used:
params.resize(ParamCount(s));
</btw 2>
Here's the least compilable code:
#include <iostream>
#include <string>
#include <vector>
using namespace std;
string arg;
vector<string> params(1024);
/*
COMMAND IS LIKE
:user@host <CMD> <PARAMS>
and params are like
<PARAMS> = <MIDDLE PARAMS> <MIDDLE PARAMS> ... <MIDDLE PARAMS> <FINAL
PARAM>
middle params are params that contain no spaces or columns ':'
.... TO BE CONTINUED ...
*/
string RemoveLeadingColon(const string &s) {
string s2 = s;
if (s2[0] == ':') s2.erase(0,1);
return s2;
}
int ParamCount(const string &s) {
int count=1;
string::size_type i;
for (i=0; i < s.length(); i++) {
if (s[i] == ' ' /*&& !found_column*/ )
count++;
else if (s[i] == ':' /*&& !found_column*/ ) {
return count;
}
}
return count;
}
void ParamGenerate(const string &s) {
cout << "initializing vars...\n";
string::size_type first_column = s.find(':');
if (first_column == string::npos) first_column=s.length();
string::size_type white_space=0;
string::size_type last=0;
int curr_param=0;
cout << "starting search...\n";
while ((white_space = s.find(' ', white_space+1)) != string::npos &&
white_space <= first_column) {
cout << "found space...\n";
params[curr_param] = s.substr(last,white_space);
cout << "substring is \"" << s.substr(last,white_space) << "\"\n";
last=white_space+1;
curr_param++;
}
params[curr_param] = s.substr(first_column,s.length());
}
int main() {
cout << "gimme a cmd:\n";
getline(cin,arg,'\n');
cout << "you gave me: " << arg << "\n";
cout << "without leading ':' it is: " << RemoveLeadingColon(arg) <<
"\n";
ParamGenerate(RemoveLeadingColon(arg));
cout << "Params generated\n";
int what;
do {
cout << "tell me a num: ";
cin >> what;
if (what <= ParamCount(RemoveLeadingColon(arg)) && what >= 1)
cout << "param[" << what << "] = " << params[what-1] << "\n";
else
cout << "wrong index\n";
} while (what != 0);
return 0;
}
