OS_Byte 152 (changes)
Showing changes from revision #1 to #2:
Added | Removed | Changed
Programmer's OS Reference SWI Manuals Calls
» Part OS_Byte 15 – SWI Calls
» OS_Byte 152OS
» OS_Byte
» OS_Byte 152
OS_Byte 152
(SWI &06)
| Entry | |
|---|---|
| R0 | 152 (&98) |
| R1 | Buffer number |
| Exit | |
|---|---|
| R0 | Preserved |
| R1 | Preserved |
| R2 | Next byte in buffer, corrupted if buffer empty |
| C flag set if buffer is empty, otherwise clear | |
Use
The purpose of this call is to check whether a given buffer is empty, and if a byte is available return it without removing it from the buffer.
Notes
The buffer number is not validated – undefined results (rather than an error) occur if a bad buffer number is passed.
See also
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.