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

[Per W. <pw...@ia...>]

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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