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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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/* $Id: strsep.S,v 1.5 2005/11/02 22:08:03 aesok Exp $ */
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/** \ingroup avr_string
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\fn char *strsep(char **string, const char *delim)
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\brief Parse a string into tokens.
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The strsep() function locates, in the string referenced by *string,
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the first occurrence of any character in the string delim (or the
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terminating '\\0' character) and replaces it with a '\\0'. The location
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of the next character after the delimiter character (or NULL, if the
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end of the string was reached) is stored in *string. An ``empty''
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field, i.e. one caused by two adjacent delimiter characters, can be
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detected by comparing the location referenced by the pointer returned
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\returns The strtok_r() function returns a pointer to the original
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value of *string. If *stringp is initially NULL, strsep() returns NULL.
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POSSIBILITY OF SUCH DAMAGE. */
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/* $Id: strsep.S,v 1.5.2.2 2007/03/31 13:28:29 dmix Exp $ */
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/** \ingroup avr_string
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\fn char *strsep(char **sp, const char *delim)
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\brief Parse a string into tokens.
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The strsep() function locates, in the string referenced by \p *sp,
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the first occurrence of any character in the string \p delim (or the
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terminating '\\0' character) and replaces it with a '\\0'. The
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location of the next character after the delimiter character (or \c
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NULL, if the end of the string was reached) is stored in \p *sp. An
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``empty'' field, i.e. one caused by two adjacent delimiter
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characters, can be detected by comparing the location referenced by
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the pointer returned in \p *sp to '\\0'.
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\return The strsep() function returns a pointer to the original
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value of \p *sp. If \p *sp is initially \c NULL, strsep() returns
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#if !defined(__DOXYGEN__)
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#include "macros.inc"
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.type _U(strsep),@function
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_U(strsep): ; Check on NULL pointers
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LD str_hi, X ; str = *p_str
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CP str_lo, __zero_reg__
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CPC str_hi, __zero_reg__ ; str == NULL ?
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.L_str_scan_init: ; scan string
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X_movw XL, str_lo ; X = str
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.L_scan_str_loop: ; next str char, 1st del char
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LD str_c, X+ ; str_c = *str++
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X_movw ZL, del_lo ; Z = del
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LD del_c, Z+ ; del_c = *Z
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CP del_c, str_c ; if (del_c == str_c)
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TST str_c ; end of str ?
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1: ST -X, __zero_reg__ ; str[-1] = \0
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ADIW XL, 1 ; undo auto decrement
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2: X_movw ZL, p_str_lo
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ST Z, XH ; *string = str
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X_movw p_str_lo, str_lo
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3: TST del_c ; end of del string ?
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BRNE .L_scan_del_loop ; next del char, same str_char
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RJMP .L_scan_str_loop ; next str char, 1st del char
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.size _U(strsep), .L_strsep_end - _U(strsep)
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; check a NULL pointer
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ld XL, Z ; str address
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X_movw str_lo, XL ; save for return
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; get a symbol from str
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brne 2b ; if symbol is't match && no delim end
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brne 1b ; if symbol is absent in delim[] && not a zero
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; chr is founded in delim[] (possible, it is a terminating zero of str)
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tst r0 ; the same, as chr
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X_movw XL, r0 ; __zero_reg__ is r1
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; OK, delimeter symbol is founded
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3: st -X, __zero_reg__ ; replace by '\0'
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adiw XL, 1 ; address of next token
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; save result to *sp and return
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5: X_movw ret_lo, str_lo ; return original address
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.size _U(strsep), . - _U(strsep)
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#endif /* not __DOXYGEN__ */
added
removed
libc/string/strsep.S
