usr/src/lib/libc/mips/string/strlen.s

/*-
 * Copyright (c) 1991, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Ralph Campbell.
 *
 * %sccs.include.redist.c%
 */

#include <machine/machAsmDefs.h>

#if defined(LIBC_SCCS) && !defined(lint)
        ASMSTR("@(#)strlen.s    8.1 (Berkeley) %G%")
#endif /* LIBC_SCCS and not lint */

LEAF(strlen)
        addu    v1, a0, 1
1:
        lb      v0, 0(a0)               # get byte from string
        addu    a0, a0, 1               # increment pointer
        bne     v0, zero, 1b            # continue if not end
        subu    v0, a0, v1              # compute length - 1 for '\0' char
        j       ra
END(strlen)