diff options
Diffstat (limited to 'newlib/libc/machine/rx/strlen.S')
| -rw-r--r-- | newlib/libc/machine/rx/strlen.S | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/newlib/libc/machine/rx/strlen.S b/newlib/libc/machine/rx/strlen.S new file mode 100644 index 000000000..c07b429b2 --- /dev/null +++ b/newlib/libc/machine/rx/strlen.S @@ -0,0 +1,16 @@ + .file "strlen.S" + + .section .text + + .global _strlen + .type _strlen,@function +_strlen: + add #0, r1, r4 ; Save a copy of the string start address and set the condition flags. + beq null_string ; Test for a NULL pointer. + mov #-1, r3 ; Set a limit on the number of bytes examined. + mov #0, r2 ; Stop searching when we find a NUL byte. + suntil.b ; Search until *r1 == r2 + sub #1, r1 ; suntil.b leaves r1 pointing to the byte beyond the match. +null_string: + sub r4, r1 ; Compute the length. + rts |