OS_GBPB 4 (changes)
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OS SWI Calls
» OS_GBPB
» OS_GBPB 4
OS_ GBPB 4
(SWI &0C)
| Entry | |
|---|---|
| R0 | 4 |
| R1 | File handle |
| R2 | Pointer to buffer |
| R3 | Bytes to read |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Preserved |
| R2 | Pointer after end of data |
| R3 | Number of bytes not transferred |
| R4 | New file pointer |
| C flag is clear if R3=0, else it is set | |
Use
The purpose of this call is to read bytes from an open file at the current file pointer.
Notes
The ‘EOF-error-on-next-read’ flag is cleared.
Error is generated if invalid file handle, directory, or no read access.
OS_GBPB 3 read bytes from an open file at a given file pointer.
See also
Other languages documentation
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