Re: [Dev-C++] newbie string parsing question

[Scott S. <age...@co...>]

Here are some links: http://www.acm.uiuc.edu/webmonkeys/book/c_guide/
http://www.eskimo.com/~scs/cclass/notes/top.html
http://people.cs.uchicago.edu/~iancooke/osstuff/ccc.html

w0rldd0m wrote:

>This looks like a great solution. 
><Humble>
>Is there a way translate this into a 'Comp. Sci 1' solution?
>I just finished the class and Im not familiar fgets(), sscanf() and
>String sanitizing yet, although Im a swashbuckler with making a new string
>variables.
>My classmates will be impressed when I drop a "buffer overflow attack"
>problem on them.
></Humble>
>
>Thank you in advance for any help you can offer.
>
>
>-----Original Message-----
>From: dev...@li...
>[mailto:dev...@li...] On Behalf Of Scott
>Simontis
>Sent: Tuesday, August 17, 2004 5:06 PM
>To: Per Westermark
>Cc: Matt Valerio; wor...@so...; dev...@li...
>Subject: Re: [Dev-C++] newbie string parsing question
>
>This is probably the smartest solution. I was going to suggest C functions.
>Also, you can include <cstdio> instead of stdio.h. That will include all of
>the C headers in namespace std.
>Per Westermark wrote:
>
>  
>
>>Note 1: fscanf will not allocate any memory. first_name and last_name 
>>must already point to large enough memory buffers.
>>
>>Note 2: that scanf functions are a common road of buffer overflow attacks.
>>If one of the names in the string is very long, it will overwrite 
>>unallocated memory. Whenever strings are loaded, a maximum field width 
>>should be specified in the formatting string!
>>
>>One other common method of loading text lines using C, i.e. without use 
>>of the string data type, is to load each text line with
>> fgets(buf,sizeof(buf),file)
>>and then use sscanf() on a sanitized string, or use strchr(), strtok() 
>>or similar to find the separator character(s) between the tokens.
>>
>>/Per W
>>
>>On Tue, 17 Aug 2004, Matt Valerio wrote:
>>
>> 
>>
>>    
>>
>>>Look up the fscanf() function.
>>>
>>>pseudo-code:
>>>#include <stdio.h>
>>>
>>>char* first_name;
>>>char* last_name;
>>>int age;
>>>FILE* in_file;
>>>infile = fopen("data.txt","r");
>>>while ( !eof(infile) ) {
>>>	fscanf( infile, "%s\t%s\t%d\r", first_name, last_name, &age);
>>>	// do something with the first_name, last_name, and age variables
>>>      
>>>
>here.
>  
>
>>>}
>>>close(infile);
>>>
>>>
>>>I think that's right -- might want to double check all of the pointers 
>>>and stuff (the * and & operators).  I'm just typing this off the top 
>>>of my head so double check the syntax.
>>>
>>>-Matt
>>>
>>>
>>>
>>>
>>>wor...@so... wrote:
>>>
>>>   
>>>
>>>      
>>>
>>>>Hi all,
>>>>
>>>>Thank you in advance for any help that you can offer.
>>>>
>>>>I have a text file that has records like this:
>>>>
>>>>Firstname 	Lastname 	age  //seperated by the \t character.
>>>>
>>>>I want to run a while loop and parse the record to populate a struct
>>>>        
>>>>
>array.
>  
>
>>>>I have looked into the getline(string, max, delimiter) function but it
>>>>        
>>>>
>needs char[]'s.
>  
>
>>>>Since I don't know the length of the string that I need can someone 
>>>>recommend an existing different class function or something?
>>>>
>>>>Best regards,
>>>>
>>>>Dane
>>>>
>>>>
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