/* Copyright (c) 2003, 2007 Reiner Patommel Copyright (c) 2007 Dmitry Xmelkov All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of the copyright holders nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* $Id$ */ /** \file */ /** \ingroup avr_string \fn char *strsep(char **sp, const char *delim) \brief Parse a string into tokens. The strsep() function locates, in the string referenced by \p *sp, the first occurrence of any character in the string \p delim (or the terminating '\\0' character) and replaces it with a '\\0'. The location of the next character after the delimiter character (or \c NULL, if the end of the string was reached) is stored in \p *sp. An ``empty'' field, i.e. one caused by two adjacent delimiter characters, can be detected by comparing the location referenced by the pointer returned in \p *sp to '\\0'. \return The strsep() function returns a pointer to the original value of \p *sp. If \p *sp is initially \c NULL, strsep() returns \c NULL. */ #if !defined(__AVR_TINY__) #if !defined(__DOXYGEN__) #include "macros.inc" #define strp_lo r24 #define dlm_lo r22 #define str_lo r20 #define chr r19 #define ret_lo r24 ASSEMBLY_CLIB_SECTION .global _U(strsep) .type _U(strsep),@function _U(strsep): ; check a NULL pointer X_movw ZL, strp_lo ld XL, Z ; str address ldd XH, Z+1 X_movw str_lo, XL ; save for return adiw XL, 0 breq 5f ; return NULL ; get a symbol from str 1: ld chr, X+ ; scan delim[] X_movw ZL, dlm_lo 2: ld r0, Z+ cp r0, chr cpse r0, __zero_reg__ brne 2b ; if symbol is't match && no delim end brne 1b ; if symbol is absent in delim[] && not a zero ; chr is founded in delim[] (possible, it is a terminating zero of str) tst r0 ; the same, as chr brne 3f X_movw XL, r0 ; __zero_reg__ is r1 rjmp 4f ; OK, delimeter symbol is founded 3: st -X, __zero_reg__ ; replace by '\0' adiw XL, 1 ; address of next token ; save result to *sp and return 4: X_movw ZL, strp_lo st Z, XL std Z+1, XH 5: X_movw ret_lo, str_lo ; return original address ret .size _U(strsep), . - _U(strsep) #endif /* not __DOXYGEN__ */ #endif /* !defined(__AVR_TINY__) */