diff options
Diffstat (limited to 'kernel/string.S')
| -rw-r--r-- | kernel/string.S | 28 |
1 files changed, 27 insertions, 1 deletions
diff --git a/kernel/string.S b/kernel/string.S index afd5985..4fb1ccc 100644 --- a/kernel/string.S +++ b/kernel/string.S @@ -35,12 +35,38 @@ strcmp: 1: lbu t0, 0(a0) lbu t1, 0(a1) - bne t0, t1, 2f addi a0, a0, 1 addi a1, a1, 1 + bne t0, t1, 2f bnez t0, 1b li a0, 0 ret 2: sub a0, t0, t1 ret + +/* + * Defined in include/fbos/string.h + * + * int memcmp(const void *ptr1, const void *ptr2, size_t n) + * + * Returns (a0): comparison result as in stdlib. + * Parameter (a0, a1): strings to compare. + * Clobbers: t0, t1. + */ +.global memcmp +.type memcmp, @function +memcmp: +1: + lbu t0, 0(a0) + lbu t1, 0(a1) + bne t0, t1, 2f + addi a0, a0, 1 + addi a1, a1, 1 + addi a2, a2, -1 + bnez a2, 1b + li a0, 0 + ret +2: + sub a0, t0, t1 + ret |