1/* 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 4 * strlen. 5 * 6 * Inputs: 7 * in0: address of buffer 8 * in1: string length limit N 9 * Outputs: 10 * r8: 0 in case of fault, strlen(buffer)+1 otherwise 11 * 12 * Copyright (C) 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com> 13 */ 14 15#include <asm/asmmacro.h> 16#include <asm/export.h> 17 18GLOBAL_ENTRY(__strnlen_user) 19 .prologue 20 alloc r2=ar.pfs,2,0,0,0 21 .save ar.lc, r16 22 mov r16=ar.lc // preserve ar.lc 23 24 .body 25 26 add r3=-1,in1 27 ;; 28 mov ar.lc=r3 29 mov r9=0 30 ;; 31 // XXX braindead strlen loop---this needs to be optimized 32.Loop1: 33 EXCLR(.Lexit, ld1 r8=[in0],1) 34 add r9=1,r9 35 ;; 36 cmp.eq p6,p0=r8,r0 37(p6) br.cond.dpnt .Lexit 38 br.cloop.dptk.few .Loop1 39 40 add r9=1,in1 // NUL not found---return N+1 41 ;; 42.Lexit: 43 mov r8=r9 44 mov ar.lc=r16 // restore ar.lc 45 br.ret.sptk.many rp 46END(__strnlen_user) 47EXPORT_SYMBOL(__strnlen_user) 48