thodg/libgit2/src/util/wildmatch.c

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• Hash : c3b7ace9
  Author :
  Date : 2021-11-14T16:43:53
  

  refactor: make util an object library Instead of simply including the utility files directly, make them a cmake object library for easy reusability between other projects within libgit2. Now the top-level `src` is responsible for platform selection, while the next-level `libgit2` and `util` configurations are responsible for identifying what objects they include.

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• src/util/wildmatch.c

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   *
   * Do shell-style pattern matching for ?, \, [], and * characters.
   * It is 8bit clean.
   *
   * Written by Rich $alz, mirror!rs, Wed Nov 26 19:03:17 EST 1986.
   * Rich $alz is now <rsalz@bbn.com>.
   *
   * Modified by Wayne Davison to special-case '/' matching, to make '**'
   * work differently than '*', and to fix the character-class code.
   *
   * Imported from git.git.
   */
  
  #include "wildmatch.h"
  
  #define GIT_SPACE 0x01
  #define GIT_DIGIT 0x02
  #define GIT_ALPHA 0x04
  #define GIT_GLOB_SPECIAL 0x08
  #define GIT_REGEX_SPECIAL 0x10
  #define GIT_PATHSPEC_MAGIC 0x20
  #define GIT_CNTRL 0x40
  #define GIT_PUNCT 0x80
  
  enum {
  	S = GIT_SPACE,
  	A = GIT_ALPHA,
  	D = GIT_DIGIT,
  	G = GIT_GLOB_SPECIAL,	/* *, ?, [, \\ */
  	R = GIT_REGEX_SPECIAL,	/* $, (, ), +, ., ^, {, | */
  	P = GIT_PATHSPEC_MAGIC, /* other non-alnum, except for ] and } */
  	X = GIT_CNTRL,
  	U = GIT_PUNCT,
  	Z = GIT_CNTRL | GIT_SPACE
  };
  
  static const unsigned char sane_ctype[256] = {
  	X, X, X, X, X, X, X, X, X, Z, Z, X, X, Z, X, X,		/*   0.. 15 */
  	X, X, X, X, X, X, X, X, X, X, X, X, X, X, X, X,		/*  16.. 31 */
  	S, P, P, P, R, P, P, P, R, R, G, R, P, P, R, P,		/*  32.. 47 */
  	D, D, D, D, D, D, D, D, D, D, P, P, P, P, P, G,		/*  48.. 63 */
  	P, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A,		/*  64.. 79 */
  	A, A, A, A, A, A, A, A, A, A, A, G, G, U, R, P,		/*  80.. 95 */
  	P, A, A, A, A, A, A, A, A, A, A, A, A, A, A, A,		/*  96..111 */
  	A, A, A, A, A, A, A, A, A, A, A, R, R, U, P, X,		/* 112..127 */
  	/* Nothing in the 128.. range */
  };
  
  #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
  #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
  
  typedef unsigned char uchar;
  
  /* What character marks an inverted character class? */
  #define NEGATE_CLASS	'!'
  #define NEGATE_CLASS2	'^'
  
  #define CC_EQ(class, len, litmatch) ((len) == sizeof (litmatch)-1 \
  				    && *(class) == *(litmatch) \
  				    && strncmp((char*)class, litmatch, len) == 0)
  
  #if defined STDC_HEADERS || !defined isascii
  # define ISASCII(c) 1
  #else
  # define ISASCII(c) isascii(c)
  #endif
  
  #ifdef isblank
  # define ISBLANK(c) (ISASCII(c) && isblank(c))
  #else
  # define ISBLANK(c) ((c) == ' ' || (c) == '\t')
  #endif
  
  #ifdef isgraph
  # define ISGRAPH(c) (ISASCII(c) && isgraph(c))
  #else
  # define ISGRAPH(c) (ISASCII(c) && isprint(c) && !isspace(c))
  #endif
  
  #define ISPRINT(c) (ISASCII(c) && isprint(c))
  #define ISDIGIT(c) (ISASCII(c) && isdigit(c))
  #define ISALNUM(c) (ISASCII(c) && isalnum(c))
  #define ISALPHA(c) (ISASCII(c) && isalpha(c))
  #define ISCNTRL(c) (ISASCII(c) && iscntrl(c))
  #define ISLOWER(c) (ISASCII(c) && islower(c))
  #define ISPUNCT(c) (ISASCII(c) && ispunct(c))
  #define ISSPACE(c) (ISASCII(c) && isspace(c))
  #define ISUPPER(c) (ISASCII(c) && isupper(c))
  #define ISXDIGIT(c) (ISASCII(c) && isxdigit(c))
  
  /* Match pattern "p" against "text" */
  static int dowild(const uchar *p, const uchar *text, unsigned int flags)
  {
  	uchar p_ch;
  	const uchar *pattern = p;
  
  	for ( ; (p_ch = *p) != '\0'; text++, p++) {
  		int matched, match_slash, negated;
  		uchar t_ch, prev_ch;
  		if ((t_ch = *text) == '\0' && p_ch != '*')
  			return WM_ABORT_ALL;
  		if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
  			t_ch = tolower(t_ch);
  		if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
  			p_ch = tolower(p_ch);
  		switch (p_ch) {
  		case '\\':
  			/* Literal match with following character.  Note that the test
  			 * in "default" handles the p[1] == '\0' failure case. */
  			p_ch = *++p;
  			/* FALLTHROUGH */
  		default:
  			if (t_ch != p_ch)
  				return WM_NOMATCH;
  			continue;
  		case '?':
  			/* Match anything but '/'. */
  			if ((flags & WM_PATHNAME) && t_ch == '/')
  				return WM_NOMATCH;
  			continue;
  		case '*':
  			if (*++p == '*') {
  				const uchar *prev_p = p - 2;
  				while (*++p == '*') {}
  				if (!(flags & WM_PATHNAME))
  					/* without WM_PATHNAME, '*' == '**' */
  					match_slash = 1;
  				else if ((prev_p < pattern || *prev_p == '/') &&
  				    (*p == '\0' || *p == '/' ||
  				     (p[0] == '\\' && p[1] == '/'))) {
  					/*
  					 * Assuming we already match 'foo/' and are at
  					 * <star star slash>, just assume it matches
  					 * nothing and go ahead match the rest of the
  					 * pattern with the remaining string. This
  					 * helps make foo/<*><*>/bar (<> because
  					 * otherwise it breaks C comment syntax) match
  					 * both foo/bar and foo/a/bar.
  					 */
  					if (p[0] == '/' &&
  					    dowild(p + 1, text, flags) == WM_MATCH)
  						return WM_MATCH;
  					match_slash = 1;
  				} else /* WM_PATHNAME is set */
  					match_slash = 0;
  			} else
  				/* without WM_PATHNAME, '*' == '**' */
  				match_slash = flags & WM_PATHNAME ? 0 : 1;
  			if (*p == '\0') {
  				/* Trailing "**" matches everything.  Trailing "*" matches
  				 * only if there are no more slash characters. */
  				if (!match_slash) {
  					if (strchr((char*)text, '/') != NULL)
  						return WM_NOMATCH;
  				}
  				return WM_MATCH;
  			} else if (!match_slash && *p == '/') {
  				/*
  				 * _one_ asterisk followed by a slash
  				 * with WM_PATHNAME matches the next
  				 * directory
  				 */
  				const char *slash = strchr((char*)text, '/');
  				if (!slash)
  					return WM_NOMATCH;
  				text = (const uchar*)slash;
  				/* the slash is consumed by the top-level for loop */
  				break;
  			}
  			while (1) {
  				if (t_ch == '\0')
  					break;
  				/*
  				 * Try to advance faster when an asterisk is
  				 * followed by a literal. We know in this case
  				 * that the string before the literal
  				 * must belong to "*".
  				 * If match_slash is false, do not look past
  				 * the first slash as it cannot belong to '*'.
  				 */
  				if (!is_glob_special(*p)) {
  					p_ch = *p;
  					if ((flags & WM_CASEFOLD) && ISUPPER(p_ch))
  						p_ch = tolower(p_ch);
  					while ((t_ch = *text) != '\0' &&
  					       (match_slash || t_ch != '/')) {
  						if ((flags & WM_CASEFOLD) && ISUPPER(t_ch))
  							t_ch = tolower(t_ch);
  						if (t_ch == p_ch)
  							break;
  						text++;
  					}
  					if (t_ch != p_ch)
  						return WM_NOMATCH;
  				}
  				if ((matched = dowild(p, text, flags)) != WM_NOMATCH) {
  					if (!match_slash || matched != WM_ABORT_TO_STARSTAR)
  						return matched;
  				} else if (!match_slash && t_ch == '/')
  					return WM_ABORT_TO_STARSTAR;
  				t_ch = *++text;
  			}
  			return WM_ABORT_ALL;
  		case '[':
  			p_ch = *++p;
  #ifdef NEGATE_CLASS2
  			if (p_ch == NEGATE_CLASS2)
  				p_ch = NEGATE_CLASS;
  #endif
  			/* Assign literal 1/0 because of "matched" comparison. */
  			negated = p_ch == NEGATE_CLASS ? 1 : 0;
  			if (negated) {
  				/* Inverted character class. */
  				p_ch = *++p;
  			}
  			prev_ch = 0;
  			matched = 0;
  			do {
  				if (!p_ch)
  					return WM_ABORT_ALL;
  				if (p_ch == '\\') {
  					p_ch = *++p;
  					if (!p_ch)
  						return WM_ABORT_ALL;
  					if (t_ch == p_ch)
  						matched = 1;
  				} else if (p_ch == '-' && prev_ch && p[1] && p[1] != ']') {
  					p_ch = *++p;
  					if (p_ch == '\\') {
  						p_ch = *++p;
  						if (!p_ch)
  							return WM_ABORT_ALL;
  					}
  					if (t_ch <= p_ch && t_ch >= prev_ch)
  						matched = 1;
  					else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch)) {
  						uchar t_ch_upper = toupper(t_ch);
  						if (t_ch_upper <= p_ch && t_ch_upper >= prev_ch)
  							matched = 1;
  					}
  					p_ch = 0; /* This makes "prev_ch" get set to 0. */
  				} else if (p_ch == '[' && p[1] == ':') {
  					const uchar *s;
  					int i;
  					for (s = p += 2; (p_ch = *p) && p_ch != ']'; p++) {} /*SHARED ITERATOR*/
  					if (!p_ch)
  						return WM_ABORT_ALL;
  					i = (int)(p - s - 1);
  					if (i < 0 || p[-1] != ':') {
  						/* Didn't find ":]", so treat like a normal set. */
  						p = s - 2;
  						p_ch = '[';
  						if (t_ch == p_ch)
  							matched = 1;
  						continue;
  					}
  					if (CC_EQ(s,i, "alnum")) {
  						if (ISALNUM(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "alpha")) {
  						if (ISALPHA(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "blank")) {
  						if (ISBLANK(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "cntrl")) {
  						if (ISCNTRL(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "digit")) {
  						if (ISDIGIT(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "graph")) {
  						if (ISGRAPH(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "lower")) {
  						if (ISLOWER(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "print")) {
  						if (ISPRINT(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "punct")) {
  						if (ISPUNCT(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "space")) {
  						if (ISSPACE(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "upper")) {
  						if (ISUPPER(t_ch))
  							matched = 1;
  						else if ((flags & WM_CASEFOLD) && ISLOWER(t_ch))
  							matched = 1;
  					} else if (CC_EQ(s,i, "xdigit")) {
  						if (ISXDIGIT(t_ch))
  							matched = 1;
  					} else /* malformed [:class:] string */
  						return WM_ABORT_ALL;
  					p_ch = 0; /* This makes "prev_ch" get set to 0. */
  				} else if (t_ch == p_ch)
  					matched = 1;
  			} while (prev_ch = p_ch, (p_ch = *++p) != ']');
  			if (matched == negated ||
  			    ((flags & WM_PATHNAME) && t_ch == '/'))
  				return WM_NOMATCH;
  			continue;
  		}
  	}
  
  	return *text ? WM_NOMATCH : WM_MATCH;
  }
  
  /* Match the "pattern" against the "text" string. */
  int wildmatch(const char *pattern, const char *text, unsigned int flags)
  {
  	return dowild((const uchar*)pattern, (const uchar*)text, flags);
  }
  

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