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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 |
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POSSIBILITY OF SUCH DAMAGE. */ |
POSSIBILITY OF SUCH DAMAGE. */ |
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/* $Id$ */ |
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/* |
/* |
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strlwr.S |
strlwr.S |
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convert a string to lower case |
convert a string to lower case |
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Contributors: |
Contributors: |
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Created by Reiner Patommel |
Created by Reiner Patommel |
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*/ |
*/ |
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#include "macros.inc" |
#include "macros.inc" |
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#define str_hi r25 |
#define str_hi r25 |
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#if !defined(__DOXYGEN__) |
#if !defined(__DOXYGEN__) |
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.text |
.text |
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.global _U(strlwr) |
.global _U(strlwr) |
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.type _U(strlwr), @function |
.type _U(strlwr), @function |
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|
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_U(strlwr): |
_U(strlwr): |
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LOAD_X(str_lo, str_hi) |
X_movw XL, str_lo |
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.strlwr_loop: |
.L_strlwr_loop: |
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LD temp, X ; get 1st character |
LD temp, X ; get 1st character |
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TST temp ; is it end of string |
TST temp ; is it end of string |
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BREQ .strlwr_done |
BREQ .L_strlwr_done |
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ORI temp, 0x20 ; make lower case |
ORI temp, 0x20 ; make lower case |
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CPI temp, 'a' ; test on [a .. z] |
CPI temp, 'a' ; test on [a .. z] |
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BRLT .strlwr_next |
BRLT .L_strlwr_next |
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CPI temp, 'z'+1 |
CPI temp, 'z'+1 |
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BRGE .strlwr_next |
BRGE .L_strlwr_next |
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ST X, temp ; ok, it is a char --> store it |
ST X, temp ; ok, it is a char --> store it |
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.strlwr_next: |
.L_strlwr_next: |
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ADIW XL, 1 ; point to next character |
ADIW XL, 1 ; point to next character |
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RJMP .strlwr_loop |
RJMP .L_strlwr_loop |
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.strlwr_done: |
.L_strlwr_done: |
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RET |
RET |
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.strlwr_end: |
.L_strlwr_end: |
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.size _U(strlwr), .strlwr_end - _U(strlwr) |
.size _U(strlwr), .L_strlwr_end - _U(strlwr) |
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#endif /* not __DOXYGEN__ */ |
#endif /* not __DOXYGEN__ */ |