Tokenizing a string in Ada

[rbbaldwin8@cs.com (Rbbaldwin8)]

Hello.  I'm new at Ada and have a problem in an application I need to write.  

I need to read lines from a text file which consist of a mixture of strings and
numeric values separated by commas and use these values in the application. 
The format of each line is the same as far as which data is in each position. 
I think the safest way to do this is to read each line into a fixed-length
string, then split it at the commas.  Strings in the CSV lines are not quoted
but do not contain  commas within the strings.

How can I do this in Ada.  I can't find a string function like C's strtok or
TCL's split, or am I misssing something.

Thanks in advance for your help.