Topic       : Pure C Library Documentation
Author      : John Kormylo
Version     : LIB.HYP 1.0
Subject     : Documentation/Pure C Library
Nodes       : 1309
Index Size  : 32068
HCP-Version : 3
Compiled on : Atari
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@lang       : en
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View Ref-File[ PCEXTLIB                                                   <ext.h> ]

... contains UNIX system and I/O functions.
They use errno to return standard error codes.

chdir       - change directory & drive
coreleft    - return free RAM
delay       - wait for a short time
filelength  - return size of an open file
findfirst   - return first file which matches wildcards
findnext    - return other files which match wildcards
fstat       - return status of an open file
getch       - get character
getche      - get character with echo
getcurdir   - return current directory
getcwd      - return current directory & drive 
getdate     - return date structure
getdfree    - return disk free space
getdisk     - return current drive
getftime    - return file date/time
gettime     - return time structure
kbhit       - return scan code
putch       - put character
setdate     - set date
setdisk     - change drive
setftime    - change file date/time
settime     - set time
sleep       - wait for a long time
stat        - return file status info