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/* Copyright (c) 2006, Carlos Lamas
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based on libc/pmstring/strstr_P.S which is
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Copyright (c) 2005, Werner Boellmann
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Copyright (c) 2002, Philip Soeberg
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the
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* Neither the name of the copyright holders nor the names of
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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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: strstr_PF.S 2191 2010-11-05 13:45:57Z arcanum $ */
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/** \ingroup avr_pgmspace
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\fn char *strstr_PF (const char *s1, uint_farptr_t s2)
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\brief Locate a substring.
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The strstr_PF() function finds the first occurrence of the substring \c s2
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in the string \c s1. The terminating '\\0' characters are not
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The strstr_PF() function is similar to strstr() except that \c s2 is a
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far pointer to a string in program space.
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\returns The strstr_PF() function returns a pointer to the beginning of the
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substring, or NULL if the substring is not found.
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If \c s2 points to a string of zero length, the function returns \c s1. The
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contents of RAMPZ SFR are undefined when the function returns */
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#if !defined(__AVR_TINY__)
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#if !defined(__DOXYGEN__)
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; first char of str1 (updated in loop)
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#define chr1 s2_b3 /* MSB not used */
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.type _U(strstr_PF), @function
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LPM_R0_ZPLUS_INIT s2_b2
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LPM_R0_ZPLUS_NEXT s2_b2
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tst r0 ; is str2 empty?
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ret ; return original string (req'd by standard)
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X_movw ZL, s2_b0 ; reset Z pointer
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LPM_R0_ZPLUS_INIT s2_b2
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LPM_R0_ZPLUS_NEXT s2_b2 ; fetch first char
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.L_findstart_loop_P: ; Find first char
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tst chr1 ; Is str1 @ end?
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breq .L_no_match_P ; then return
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cp chr1, r0 ; Is chr1 == r0?
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X_movw ret_b0, XL ; store return value
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brne .L_findstart_loop_P ; If, then start checking string
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LPM_R0_ZPLUS_NEXT s2_b2
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adiw XL, 1 ; Increment X with one
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.size _U(strstr_PF), .L_strstr_end_P - _U(strstr_PF)
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#endif /* not __DOXYGEN__ */
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#endif /* !defined(__AVR_TINY__) */
added
removed
libc/pmstring/strstr_PF.S
