/*

**  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.

*/

#include "cache.h"

#include "wildmatch.h"

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

					return WM_ABORT_MALFORMED;

			} 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 = 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);

}