Hi Esteban!
Structure of dbf files is well decribed in VFP help. It seems to be quite simple to a write a string to dbf file because you can easly compute position of a field in the file. But remmeber that you can also update index file. It make the work not as easy as it look at first sight.
Maybe you should look for commercial products that can help you make the job
For example www.codebase.com may help you probably



>Hi all,
>I need to open, read and write DBF files of VFP in a ANSI C routine for Linux.
>The DBFs files are stored in /mnt/win_c/DATA and I need to use it.
>Please help me.
>I don't know how to manipulate DBF in C.
>Any source code, samples, url, etc. will be welcomed.
>
>Thank you very much in advance.