Mercurial > hg > Members > kono > nitros9-code

annotate lib/alib/b09strlen.as @ 3295:6b7a7b233925 default tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
makefile: Allow PORTS with level1/2 mix https://sourceforge.net/p/nitros9/feature-requests/10/
author Tormod Volden <debian.tormod@gmail.com>
date Tue, 19 Apr 2022 18:12:17 +0200
parents 03f26e88b809
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2783
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
1 **********************************
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
2
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
3 * BASIC09 String Length: find length of a BASIC09 string
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
4 * which can be terminated by a $ff
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
5 * =or= allocated storage size
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
6
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
7 * ENTRY: X=start of string
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
8 * D=max allocated
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
9
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
10 * EXIT: D=actual length
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
11 * all other regs (except cc) preserved
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
12
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
13 nam Find Basic09 String Length
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
14 ttl Assembler Library Module
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
15
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
16
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
17 section .text
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
18
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
19 B09STRLEN:
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
20 pshs d,x,y
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
21 tfr d,y max. possible size to Y
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
22
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
23 loop
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
24 lda ,x+ get char from string
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
25 inca this effects a cmpa #$ff
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
26 beq exit reached terminator
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
27 leay -1,y if string max leng, no terminator
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
28 bne loop no yet, check more
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
29
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
30 exit
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
31 puls d get max possible size
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
32 pshs y unused size in memory
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
33 subd ,s++ find actual length
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
34 puls x,y,pc
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
35
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
36 endsect
03f26e88b809 Renamed files and setup for lwasm/lwlink work
Boisy Pitre <boisy.pitre@nuance.com>
parents:
diff changeset
37