strstr modified - need function

[cyprus106]

i need a function that searches only so far in a string, and searches for a certain phrase, or set of characters. this is just like strstr, but it only searches a designated part of the string. i.e.:
if my phrase was "borland C++ is great" and i wanted to search for 'great' between the 9th characterand the last character, i need to know how to make a function that does that, but i don't know how, any sugestions? Cyprus

 

[wimvanherp]

in this case it is fairly easy

char s1[50]={"borland C++ is great"} ;
char s2[50]={"great"};

char *ptr =strstr(s1+9,s2);
strstr searches for s2 in string s1+9, which is the string from position 9.

if you want to search in a part of a string in between you can make a function like this:


void Strstr(char *s1,char *s2,int start,int end,char *ptr)
{ // start is the startposition of the substring
// 0 is the first position
// end is the last position of the substring I want to
// search in

char[200]tempstring;
ptr=NULL;
if(end<=(start+1)) return;
if(end>strlen(s1)) return;
if(start<0) return;
strcpy(tempstring,s1+start);
if(end!=strlen(s1))
tempstring[end-start+1]=0;
// make a temporary string
ptr=strstr(tempstring,s2);
// search for occurence of s2 in tempstring
if(ptr)
ptr=s1+start+(ptr-tempstring);
// calculate the offset from within the original string
// tempstring is a temporary string that is destroyed
// after this function is done

return ;
} // ptr is the pointer to the part of the substring
// where the searchstring starts


Is this what you want








Wim Vanherp
Wim.Vanherp@myself.com

 

[cyprus106]

yeah....yeah! thanx! i didn't have the time nor the patience to deal with trying to make that, and for a while after I posted this it looked like noone else did either. thanks, alot. it's appreciated Cyprus

 

[Guest_imported]

I started to answer this post the other day but didn't finish. I see someone else gave you a solution. The solution I was going to give used Borland's AnsiString functions. This is a simple two liner. It may run a tad slower than winvanherp's solution but only negligably.

{
int startchar;
String Original, Temp;

Original = &quot;borland C++ is great&quot;;
Temp = Original.SubString(9, Original.Length()-9);
startchar = Temp.Pos(&quot;great&quot;

//startchar should equal 8

}

I didn't actually compile this but I'm sure its close enough that you can understand whats going on.

Not as elegant as the c function but I find it gets the job done.

If you want a good description of the AnsiString class see the tutorials section at

http://www.thebits.org

Don Smith

 

[cyprus106]

hey, great, thanx! I'll use it, thanx for the solutions, guys Cyprus