[dpdk-dev] [PATCH v2 1/2] eal: add fnmatch implementation

[Pallavi Kadam <pallavi.kadam@intel.com>]

Fnmatch implementation is required on Windows to support
log level arguments specified with a globbing pattern.
The source file is with BSD-3-Clause license.
https://github.com/lattera/freebsd/blob/master/usr.bin/csup/fnmatch.c

Signed-off-by: Pallavi Kadam <pallavi.kadam@intel.com>
Reviewed-by: Ranjit Menon <ranjit.menon@intel.com>
Reviewed-by: Tasnim Bashar <tbashar@mellanox.com>
Tested-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
---
 lib/librte_eal/windows/fnmatch.c         | 172 +++++++++++++++++++++++
 lib/librte_eal/windows/include/fnmatch.h |  16 +--
 lib/librte_eal/windows/meson.build       |   1 +
 3 files changed, 181 insertions(+), 8 deletions(-)
 create mode 100644 lib/librte_eal/windows/fnmatch.c

diff --git a/lib/librte_eal/windows/fnmatch.c b/lib/librte_eal/windows/fnmatch.c
new file mode 100644
index 000000000..f622bf54c
--- /dev/null
+++ b/lib/librte_eal/windows/fnmatch.c
@@ -0,0 +1,172 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright (c) 1989, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Guido van Rossum.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static const char sccsid[] = "@(#)fnmatch.c	8.2 (Berkeley) 4/16/94";
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * Function fnmatch() as specified in POSIX 1003.2-1992, section B.6.
+ * Compares a filename or pathname to a pattern.
+ */
+
+#include <ctype.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "fnmatch.h"
+
+#define EOS	'\0'
+
+static const char *rangematch(const char *, char, int);
+
+int
+fnmatch(const char *pattern, const char *string, int flags)
+{
+	const char *stringstart;
+	char c, test;
+
+	for (stringstart = string;;)
+		switch (c = *pattern++) {
+		case EOS:
+			if ((flags & FNM_LEADING_DIR) && *string == '/')
+				return (0);
+			return (*string == EOS ? 0 : FNM_NOMATCH);
+		case '?':
+			if (*string == EOS)
+				return (FNM_NOMATCH);
+			if (*string == '/' && (flags & FNM_PATHNAME))
+				return (FNM_NOMATCH);
+			if (*string == '.' && (flags & FNM_PERIOD) &&
+			    (string == stringstart ||
+			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
+				return (FNM_NOMATCH);
+			++string;
+			break;
+		case '*':
+			c = *pattern;
+			/* Collapse multiple stars. */
+			while (c == '*')
+				c = *++pattern;
+
+			if (*string == '.' && (flags & FNM_PERIOD) &&
+			    (string == stringstart ||
+			    ((flags & FNM_PATHNAME) && *(string - 1) == '/')))
+				return (FNM_NOMATCH);
+
+			/* Optimize for pattern with * at end or before /. */
+			if (c == EOS)
+				if (flags & FNM_PATHNAME)
+					return ((flags & FNM_LEADING_DIR) ||
+					    strchr(string, '/') == NULL ?
+					    0 : FNM_NOMATCH);
+				else
+					return (0);
+			else if (c == '/' && flags & FNM_PATHNAME) {
+				string = strchr(string, '/');
+				if (string == NULL)
+					return (FNM_NOMATCH);
+				break;
+			}
+
+			/* General case, use recursion. */
+			while ((test = *string) != EOS) {
+				if (!fnmatch(pattern, string,
+					flags & ~FNM_PERIOD))
+					return (0);
+				if (test == '/' && flags & FNM_PATHNAME)
+					break;
+				++string;
+			}
+			return (FNM_NOMATCH);
+		case '[':
+			if (*string == EOS)
+				return (FNM_NOMATCH);
+			if (*string == '/' && flags & FNM_PATHNAME)
+				return (FNM_NOMATCH);
+			pattern = rangematch(pattern, *string, flags);
+			if (pattern == NULL)
+				return (FNM_NOMATCH);
+			++string;
+			break;
+		case '\\':
+			if (!(flags & FNM_NOESCAPE)) {
+				c = *pattern++;
+				if (c == EOS) {
+					c = '\\';
+					--pattern;
+				}
+			}
+			/* FALLTHROUGH */
+		default:
+			if (c == *string)
+				;
+			else if ((flags & FNM_CASEFOLD) &&
+				 (tolower((unsigned char)c) ==
+				  tolower((unsigned char)*string)))
+				;
+			else if ((flags & FNM_PREFIX_DIRS) && *string == EOS &&
+			     ((c == '/' && string != stringstart) ||
+			     (string == stringstart+1 && *stringstart == '/')))
+				return (0);
+			else
+				return (FNM_NOMATCH);
+			string++;
+			break;
+		}
+	/* NOTREACHED */
+}
+
+static const char *
+rangematch(const char *pattern, char test, int flags)
+{
+	int negate, ok;
+	char c, c2;
+
+	/*
+	 * A bracket expression starting with an unquoted circumflex
+	 * character produces unspecified results (IEEE 1003.2-1992,
+	 * 3.13.2).  This implementation treats it like '!', for
+	 * consistency with the regular expression syntax.
+	 * J.T. Conklin (conklin@ngai.kaleida.com)
+	 */
+	negate = (*pattern == '!' || *pattern == '^');
+	if (negate)
+		++pattern;
+
+	if (flags & FNM_CASEFOLD)
+		test = tolower((unsigned char)test);
+
+	for (ok = 0; (c = *pattern++) != ']';) {
+		if (c == '\\' && !(flags & FNM_NOESCAPE))
+			c = *pattern++;
+		if (c == EOS)
+			return (NULL);
+
+		if (flags & FNM_CASEFOLD)
+			c = tolower((unsigned char)c);
+
+		c2 = *(pattern + 1);
+		if (*pattern == '-' && c2 != EOS && c2 != ']') {
+			pattern += 2;
+			if (c2 == '\\' && !(flags & FNM_NOESCAPE))
+				c2 = *pattern++;
+			if (c2 == EOS)
+				return (NULL);
+
+			if (flags & FNM_CASEFOLD)
+				c2 = tolower((unsigned char)c2);
+
+			if ((unsigned char)c <= (unsigned char)test &&
+			    (unsigned char)test <= (unsigned char)c2)
+				ok = 1;
+		} else if (c == test)
+			ok = 1;
+	}
+	return (ok == negate ? NULL : pattern);
+}
diff --git a/lib/librte_eal/windows/include/fnmatch.h b/lib/librte_eal/windows/include/fnmatch.h
index d0159f07a..142753c35 100644
--- a/lib/librte_eal/windows/include/fnmatch.h
+++ b/lib/librte_eal/windows/include/fnmatch.h
@@ -18,6 +18,13 @@ extern "C" {
 
 #define FNM_NOMATCH 1
 
+#define FNM_NOESCAPE 0x01
+#define FNM_PATHNAME 0x02
+#define FNM_PERIOD 0x04
+#define FNM_LEADING_DIR 0x08
+#define FNM_CASEFOLD 0x10
+#define FNM_PREFIX_DIRS 0x20
+
 /**
  * This function is used for searhing a given string source
  * with the given regular expression pattern.
@@ -34,14 +41,7 @@ extern "C" {
  * @return
  *	if the pattern is found then return 0 or else FNM_NOMATCH
  */
-static inline int fnmatch(__rte_unused const char *pattern,
-		__rte_unused const char *string,
-		__rte_unused int flags)
-{
-	/* TODO */
-	/* This is a stub, not the expected result */
-	return FNM_NOMATCH;
-}
+int fnmatch(const char *pattern, const char *string, int flags);
 
 #ifdef __cplusplus
 }
diff --git a/lib/librte_eal/windows/meson.build b/lib/librte_eal/windows/meson.build
index 09dd4ab2f..8829407c4 100644
--- a/lib/librte_eal/windows/meson.build
+++ b/lib/librte_eal/windows/meson.build
@@ -8,5 +8,6 @@ sources += files(
 	'eal_debug.c',
 	'eal_lcore.c',
 	'eal_thread.c',
+	'fnmatch.c',
 	'getopt.c',
 )
-- 
2.18.0.windows.1