| 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 |
| 57 |
.global _U(strncpy) |
.global _U(strncpy) |
| 58 |
.type _U(strncpy), @function |
.type _U(strncpy), @function |
| 59 |
_U(strncpy): |
_U(strncpy): |
| 60 |
LOAD_Z(src_lo, src_hi) |
X_movw ZL, src_lo |
| 61 |
LOAD_X(dest_lo, dest_hi) |
X_movw XL, dest_lo |
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.strncpy_loop: |
.L_strncpy_loop: |
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subi len_lo, lo8(1) |
subi len_lo, lo8(1) |
| 64 |
sbci len_hi, hi8(1) |
sbci len_hi, hi8(1) |
| 65 |
brcs .strncpy_done |
brcs .L_strncpy_done |
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ld __tmp_reg__, Z+ |
ld __tmp_reg__, Z+ |
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st X+, __tmp_reg__ |
st X+, __tmp_reg__ |
| 68 |
tst __tmp_reg__ |
tst __tmp_reg__ |
| 69 |
brne .strncpy_loop |
brne .L_strncpy_loop |
| 70 |
; store null characters up to the end of dest |
; store null characters up to the end of dest |
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; as the glibc manual says: |
; as the glibc manual says: |
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; This behavior is rarely useful, but it is specified by the ISO C standard. |
; This behavior is rarely useful, but it is specified by the ISO C standard. |
| 73 |
rjmp .strncpy_clr_start |
rjmp .L_strncpy_clr_start |
| 74 |
.strncpy_clr_loop: |
.L_strncpy_clr_loop: |
| 75 |
st X+, __zero_reg__ |
st X+, __zero_reg__ |
| 76 |
.strncpy_clr_start: |
.L_strncpy_clr_start: |
| 77 |
subi len_lo, lo8(1) |
subi len_lo, lo8(1) |
| 78 |
sbci len_hi, hi8(1) |
sbci len_hi, hi8(1) |
| 79 |
brcc .strncpy_clr_loop |
brcc .L_strncpy_clr_loop |
| 80 |
.strncpy_done: |
.L_strncpy_done: |
| 81 |
; return dest (unchanged) |
; return dest (unchanged) |
| 82 |
ret |
ret |
| 83 |
.strncpy_end: |
.L_strncpy_end: |
| 84 |
.size _U(strncpy), .strncpy_end - _U(strncpy) |
.size _U(strncpy), .L_strncpy_end - _U(strncpy) |
| 85 |
|
|
| 86 |
#endif /* not __DOXYGEN__ */ |
#endif /* not __DOXYGEN__ */ |