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tim |
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// Copyright (C) 1996 - 2002 Florian Schintke |
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// |
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// This is free software; you can redistribute it and/or modify it under |
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// the terms of the GNU General Public License as published by the Free |
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// Software Foundation; either version 2, or (at your option) any later |
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// version. |
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// |
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// Thanks to the E.S.O. - ACS project that has done this C++ interface |
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// to the wildcards pttern matching algorithm |
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tim |
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#include "wildcards.hpp" |
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tim |
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int |
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Wildcard::wildcardfit(const char *wildcard, const char *test) |
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{ |
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int fit = 1; |
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for (; ('\000' != *wildcard) && (1 == fit) && ('\000' != *test); wildcard++) |
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{ |
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switch (*wildcard) |
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{ |
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case '[': |
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wildcard++; /* leave out the opening square bracket */ |
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fit = set (&wildcard, &test); |
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/* we don't need to decrement the wildcard as in case */ |
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/* of asterisk because the closing ] is still there */ |
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break; |
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case '?': |
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test++; |
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break; |
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case '*': |
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fit = asterisk (&wildcard, &test); |
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/* the asterisk was skipped by asterisk() but the loop will */ |
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/* increment by itself. So we have to decrement */ |
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wildcard--; |
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break; |
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default: |
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fit = (int) (*wildcard == *test); |
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test++; |
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} |
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} |
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while ((*wildcard == '*') && (1 == fit)) |
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/* here the teststring is empty otherwise you cannot */ |
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/* leave the previous loop */ |
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wildcard++; |
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return (int) ((1 == fit) && ('\0' == *test) && ('\0' == *wildcard)); |
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} |
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int |
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Wildcard::set(const char **wildcard, const char **test) |
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{ |
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int fit = 0; |
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int negation = 0; |
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int at_beginning = 1; |
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if ('!' == **wildcard) |
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{ |
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negation = 1; |
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(*wildcard)++; |
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} |
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while ((']' != **wildcard) || (1 == at_beginning)) |
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{ |
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if (0 == fit) |
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{ |
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if (('-' == **wildcard) |
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&& ((*(*wildcard - 1)) < (*(*wildcard + 1))) |
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&& (']' != *(*wildcard + 1)) |
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&& (0 == at_beginning)) |
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{ |
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if (((**test) >= (*(*wildcard - 1))) |
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&& ((**test) <= (*(*wildcard + 1)))) |
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{ |
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fit = 1; |
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(*wildcard)++; |
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} |
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} |
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else if ((**wildcard) == (**test)) |
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{ |
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fit = 1; |
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} |
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} |
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(*wildcard)++; |
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at_beginning = 0; |
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} |
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if (1 == negation) |
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/* change from zero to one and vice versa */ |
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fit = 1 - fit; |
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if (1 == fit) |
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(*test)++; |
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return (fit); |
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} |
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int |
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Wildcard::asterisk (const char **wildcard, const char **test) |
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{ |
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/* Warning: uses multiple returns */ |
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int fit = 1; |
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/* erase the leading asterisk */ |
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(*wildcard)++; |
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while (('\000' != (**test)) |
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&& (('?' == **wildcard) |
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|| ('*' == **wildcard))) |
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{ |
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if ('?' == **wildcard) |
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(*test)++; |
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(*wildcard)++; |
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} |
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/* Now it could be that test is empty and wildcard contains */ |
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/* aterisks. Then we delete them to get a proper state */ |
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while ('*' == (**wildcard)) |
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(*wildcard)++; |
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if (('\0' == (**test)) && ('\0' != (**wildcard))) |
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return (fit = 0); |
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if (('\0' == (**test)) && ('\0' == (**wildcard))) |
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return (fit = 1); |
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else |
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{ |
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/* Neither test nor wildcard are empty! */ |
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/* the first character of wildcard isn't in [*?] */ |
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if (0 == wildcardfit(*wildcard, (*test))) |
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{ |
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do |
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{ |
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(*test)++; |
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/* skip as much characters as possible in the teststring */ |
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/* stop if a character match occurs */ |
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while (((**wildcard) != (**test)) |
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&& ('[' != (**wildcard)) |
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&& ('\0' != (**test))) |
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(*test)++; |
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} |
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while ((('\0' != **test))? |
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(0 == wildcardfit (*wildcard, (*test))) |
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: (0 != (fit = 0))); |
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} |
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if (('\0' == **test) && ('\0' == **wildcard)) |
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fit = 1; |
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return (fit); |
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} |
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} |
