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40 lines
852 B
ArmAsm
40 lines
852 B
ArmAsm
;
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; Ullrich von Bassewitz, 31.05.1998
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;
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; Note: strspn & strcspn call internally this function and rely on
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; the usage of only ptr2 here! Keep in mind when appling changes
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; and check the other implementations too!
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;
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; size_t __fastcall__ strlen (const char* s);
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;
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.export _strlen
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.importzp ptr2
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.macpack cpu
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_strlen:
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sta ptr2 ; Save s
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stx ptr2+1
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.if (.cpu .bitand ::CPU_ISET_HUC6280)
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clx
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cly
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.else
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ldx #0 ; YX used as counter
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.if (.cpu .bitand ::CPU_ISET_65816)
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txy
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.else
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ldy #0
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.endif
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.endif
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L1: lda (ptr2),y
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beq L9
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iny
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bne L1
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inc ptr2+1
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inx
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bne L1
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L9: tya ; get low byte of counter, hi's all set
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rts
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