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*/ |
*/ |
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/* $Id$ */ |
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/** \ingroup avr_string |
/** \ingroup avr_string |
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\fn size_t strlcpy (char *dst, const char *src, size_t siz) |
\fn size_t strlcpy (char *dst, const char *src, size_t siz) |
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#define rWord r24 |
#define rWord r24 |
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#define rWord_hi r25 |
#define rWord_hi r25 |
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#define rWord_lo r24 |
#define rWord_lo r24 |
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#define Z_hi r31 |
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#define Z_lo r30 |
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.text |
.text |
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.global _U(strlcpy) |
.global _U(strlcpy) |
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.type _U(strlcpy), @function |
.type _U(strlcpy), @function |
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_U(strlcpy): |
_U(strlcpy): |
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LOAD_X (dst_lo, dst_hi) ; X = dst |
X_movw XL, dst_lo ; X = dst |
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LOAD_Z (src_lo, src_hi) ; Z = src |
X_movw ZL, src_lo ; Z = src |
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cp siz_lo, __zero_reg__ |
cp siz_lo, __zero_reg__ |
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cpc siz_hi, __zero_reg__ ; size == 0 ? |
cpc siz_hi, __zero_reg__ ; size == 0 ? |
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breq .strlcpy_truncated |
breq .L_strlcpy_truncated |
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.strlcpy_copy_loop: ; copy src to dst |
.L_strlcpy_copy_loop: ; copy src to dst |
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subi siz_lo, lo8(-(-1)) |
subi siz_lo, lo8(-(-1)) |
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sbci siz_hi, hi8(-(-1)) ; decrement siz |
sbci siz_hi, hi8(-(-1)) ; decrement siz |
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breq 1f ; --> siz chars copied |
breq 1f ; --> siz chars copied |
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ld __tmp_reg__, Z+ ; get next src char |
ld __tmp_reg__, Z+ ; get next src char |
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st X+, __tmp_reg__ ; copy char |
st X+, __tmp_reg__ ; copy char |
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tst __tmp_reg__ ; end of src string ? |
tst __tmp_reg__ ; end of src string ? |
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breq .strlcpy_len ; --> all src chars copied |
breq .L_strlcpy_len ; --> all src chars copied |
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rjmp .strlcpy_copy_loop ; next char |
rjmp .L_strlcpy_copy_loop ; next char |
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1: st X, __zero_reg__ ; truncate dst string |
1: st X, __zero_reg__ ; truncate dst string |
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.strlcpy_truncated: ; find Z = end of src string |
.L_strlcpy_truncated: ; find Z = end of src string |
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ld __tmp_reg__, Z+ ; get next char from src |
ld __tmp_reg__, Z+ ; get next char from src |
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tst __tmp_reg__ ; end of src string ? |
tst __tmp_reg__ ; end of src string ? |
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brne .strlcpy_truncated ; next char |
brne .L_strlcpy_truncated ; next char |
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.strlcpy_len: ; calculate strlen(src) |
.L_strlcpy_len: ; calculate strlen(src) |
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sub Z_lo, src_lo |
sub ZL, src_lo |
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sbc Z_hi, src_hi ; Z points past \0 |
sbc ZH, src_hi ; Z points past \0 |
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sbiw Z_lo, 1 |
sbiw ZL, 1 |
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#if __AVR_ENHANCED__ |
X_movw rWord, ZL |
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movw rWord, Z_lo |
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#else |
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mov rWord_lo, Z_lo |
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mov rWord_hi, Z_hi |
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#endif |
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ret |
ret |
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.strlcpy_end: |
.L_strlcpy_end: |
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.size _U(strlcpy), .strlcpy_end - _U(strlcpy) |
.size _U(strlcpy), .L_strlcpy_end - _U(strlcpy) |
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#endif /* not DOXYGEN */ |
#endif /* not DOXYGEN */ |