/[avr-libc]/avr-libc/libc/string/strncat.S
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Diff of /avr-libc/libc/string/strncat.S

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revision 1.4 by joerg_wunsch, Tue Sep 13 13:29:54 2005 UTC revision 1.5 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 dest_hi r25  #define dest_hi r25
# Line 51  Line 53 
53          .global _U(strncat)          .global _U(strncat)
54          .type   _U(strncat), @function          .type   _U(strncat), @function
55  _U(strncat):  _U(strncat):
56          LOAD_Z(src_lo, src_hi)          X_movw  ZL, src_lo
57          LOAD_X(dest_lo, dest_hi)          X_movw  XL, dest_lo
58  .strncat_skip:  .L_strncat_skip:
59          ld      __tmp_reg__, X+          ld      __tmp_reg__, X+
60          tst     __tmp_reg__          tst     __tmp_reg__
61          brne    .strncat_skip          brne    .L_strncat_skip
62          sbiw    XL, 1           ; undo post-increment (point the the NUL)          sbiw    XL, 1           ; undo post-increment (point the the NUL)
63  .strncat_loop:  .L_strncat_loop:
64          subi    len_lo, lo8(1)          subi    len_lo, lo8(1)
65          sbci    len_hi, hi8(1)          sbci    len_hi, hi8(1)
66          brcs    .strncat_done          brcs    .L_strncat_done
67          ld      __tmp_reg__, Z+          ld      __tmp_reg__, Z+
68          tst     __tmp_reg__          tst     __tmp_reg__
69          st      X+, __tmp_reg__          st      X+, __tmp_reg__
70          brne    .strncat_loop          brne    .L_strncat_loop
71  ; return dest (unchanged)  ; return dest (unchanged)
72          ret          ret
73  .strncat_done:  .L_strncat_done:
74          st      X, __zero_reg__          st      X, __zero_reg__
75  ; return dest (unchanged)  ; return dest (unchanged)
76          ret          ret
77  .strncat_end:  .L_strncat_end:
78          .size   _U(strncat), .strncat_end - _U(strncat)          .size   _U(strncat), .L_strncat_end - _U(strncat)
79    
80  #endif /* not __DOXYGEN__ */  #endif /* not __DOXYGEN__ */

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