8099pierzina@vmsd.csd.mu.edu (Todd Pierzina) (07/11/90)
I need help.
I am using VAX C, and I want to move backward through a data (record, not
stream!) file. I am trying to use fseek. I have RTFMed, and it is very
ambiguous as far as fseek and record files go. The Unix version would be
(void) fseek(fp, (long)-sizeof(record_type), L_INCR);
where fp is the file pointer. In VAX C, the RTL manual says that using fseek
with a value not obtained from ftell is very unpredictable. No sh*t.
I could set up a stack of ftell values going forward, then when I need to go
back, pop the locations off and feed them to fseek directly. I think. So my
questions(s):
Is there an EASY way to move backward?
Will my stack method work? I do not understand how fseek/ftell work with
record files; the manual is VERY confusing.
Please reply directly to me, as I am not subscribed to these lists.
Todd Pierzina
Student Programmer
Marquette University
8099PIER@MUCSD (BITNET)
8099pierzina@vmsd.csd.mu.edu (Internet)