/[avr-libc]/avr-libc/libc/string/strnlen.S
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revision 1.5 by joerg_wunsch, Tue Sep 13 13:29:54 2005 UTC revision 1.6 by aesok, Sun Oct 30 19:36:53 2005 UTC
# Line 26  Line 26 
26    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27    POSSIBILITY OF SUCH DAMAGE. */    POSSIBILITY OF SUCH DAMAGE. */
28    
29    /* $Id$ */
30    
31  #include "macros.inc"  #include "macros.inc"
32    
33  #define src_hi r25  #define src_hi r25
# Line 52  Line 54 
54          .global _U(strnlen)          .global _U(strnlen)
55          .type   _U(strnlen), @function          .type   _U(strnlen), @function
56  _U(strnlen):  _U(strnlen):
57          LOAD_Z(src_lo, src_hi)          X_movw  ZL, src_lo
58  .strnlen_loop:  .L_strnlen_loop:
59          subi    len_lo, lo8(1)          subi    len_lo, lo8(1)
60          sbci    len_hi, hi8(1)          sbci    len_hi, hi8(1)
61          ld      __tmp_reg__, Z+          ld      __tmp_reg__, Z+
62          cpse    __tmp_reg__, __zero_reg__          cpse    __tmp_reg__, __zero_reg__
63          brcc    .strnlen_loop          brcc    .L_strnlen_loop
64  ; Z points one character past the terminating NUL  ; Z points one character past the terminating NUL
65  ; return Z - 1 - src = (-1 - src) + Z = ~src + Z  ; return Z - 1 - src = (-1 - src) + Z = ~src + Z
66          com     src_lo          com     src_lo
# Line 66  _U(strnlen): Line 68  _U(strnlen):
68          add     src_lo, ZL          add     src_lo, ZL
69          adc     src_hi, ZH          adc     src_hi, ZH
70          ret          ret
71  .strnlen_end:  .L_strnlen_end:
72          .size   _U(strnlen), .strnlen_end - _U(strnlen)          .size   _U(strnlen), .L_strnlen_end - _U(strnlen)
73    
74  #endif /* not __DOXYGEN__ */  #endif /* not __DOXYGEN__ */

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