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 17GLOBAL_ENTRY(__strnlen_user) 18 .prologue 19 alloc r2=ar.pfs,2,0,0,0 20 .save ar.lc, r16 21 mov r16=ar.lc // preserve ar.lc 22 23 .body 24 25 add r3=-1,in1 26 ;; 27 mov ar.lc=r3 28 mov r9=0 29 ;; 30.Loop1: 31 EXCLR(.Lexit, ld1 r8=[in0],1) 32 add r9=1,r9 33 ;; 34 cmp.eq p6,p0=r8,r0 35(p6) br.cond.dpnt .Lexit 36 br.cloop.dptk.few .Loop1 37 38 add r9=1,in1 // NUL not found---return N+1 39 ;; 40.Lexit: 41 mov r8=r9 42 mov ar.lc=r16 // restore ar.lc 43 br.ret.sptk.many rp 44END(__strnlen_user) 45