2 * Returns 0 if exception before NUL or reaching the supplied limit (N),
3 * a value greater than N if the string is longer than the limit, else
7 * in0: address of buffer
8 * in1: string length limit N
10 * r8: 0 in case of fault, strlen(buffer)+1 otherwise
12 * Copyright (C) 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
15 #include <asm/asmmacro.h>
16 #include <asm/export.h>
18 GLOBAL_ENTRY(__strnlen_user)
20 alloc r2=ar.pfs,2,0,0,0
22 mov r16=ar.lc // preserve ar.lc
31 // XXX braindead strlen loop---this needs to be optimized
33 EXCLR(.Lexit, ld1 r8=[in0],1)
37 (p6) br.cond.dpnt .Lexit
38 br.cloop.dptk.few .Loop1
40 add r9=1,in1 // NUL not found---return N+1
44 mov ar.lc=r16 // restore ar.lc
47 EXPORT_SYMBOL(__strnlen_user)