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19 lines
565 B
ArmAsm
19 lines
565 B
ArmAsm
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.file "strncpy.S"
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.section .text
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.global _strncpy
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.type _strncpy,@function
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_strncpy:
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mov r1, r4 ; Save a copy of the dest pointer.
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mov r3, r5 ; Save a copy of the byte count
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smovu ; Copy the bytes
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cmp #0, r3 ; If we have copied the number of bytes requested
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beq 1f ; then skip the next bit:
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add r4, r5, r1 ; Point to the last byte that we are supposed to write.
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sub r3, r1 ; Subtract the number of bytes left to be written.
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mov #0, r2 ; Fill the remaining bytes with NULs,
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sstr.b
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1:
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mov r4, r1 ; Return the destination pointer
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rts
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