Adding upstream version 3.4.23.upstream/3.4.23upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 216 insertions, 0 deletions

diff --git a/src/util/strcasecmp_utf8.c b/src/util/strcasecmp_utf8.c
new file mode 100644
index 0000000..e3f20df
--- /dev/null
+++ b/src/util/strcasecmp_utf8.c
@@ -0,0 +1,216 @@
+/*++
+/* NAME
+/*	strcasecmp_utf8 3
+/* SUMMARY
+/*	caseless string comparison
+/* SYNOPSIS
+/*	#include <stringops.h>
+/*
+/*	int	strcasecmp_utf8(
+/*	const char *s1,
+/*	const char *s2)
+/*
+/*	int	strncasecmp_utf8(
+/*	const char *s1,
+/*	const char *s2,
+/*	ssize_t	len)
+/* AUXILIARY FUNCTIONS
+/*	int	strcasecmp_utf8x(
+/*	int	flags,
+/*	const char *s1,
+/*	const char *s2)
+/*
+/*	int	strncasecmp_utf8x(
+/*	int	flags,
+/*	const char *s1,
+/*	const char *s2,
+/*	ssize_t	len)
+/* DESCRIPTION
+/*	strcasecmp_utf8() implements caseless string comparison for
+/*	UTF-8 text, with an API similar to strcasecmp(). Only ASCII
+/*	characters are casefolded when the code is compiled without
+/*	EAI support or when util_utf8_enable is zero.
+/*
+/*	strncasecmp_utf8() implements caseless string comparison
+/*	for UTF-8 text, with an API similar to strncasecmp(). Only
+/*	ASCII characters are casefolded when the code is compiled
+/*	without EAI support or when util_utf8_enable is zero.
+/*
+/*	strcasecmp_utf8x() and strncasecmp_utf8x() implement a more
+/*	complex API that provides the above functionality and more.
+/*
+/*	Arguments:
+/* .IP "s1, s2"
+/*	Null-terminated strings to be compared.
+/* .IP len
+/*	String length before casefolding.
+/* .IP flags
+/*	Zero or CASEF_FLAG_UTF8. The latter flag enables UTF-8 case
+/*	folding instead of folding only ASCII characters. This flag
+/*	is ignored when compiled without EAI support.
+/* SEE ALSO
+/*	casefold(), casefold text for caseless comparison.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	IBM T.J. Watson Research
+/*	P.O. Box 704
+/*	Yorktown Heights, NY 10598, USA
+/*
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+ /*
+  * System library.
+  */
+#include <sys_defs.h>
+#include <string.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+ /*
+  * Utility library.
+  */
+#include <stringops.h>
+
+#define STR(x)	vstring_str(x)
+
+static VSTRING *f1;			/* casefold result for s1 */
+static VSTRING *f2;			/* casefold result for s2 */
+
+/* strcasecmp_utf8_init - initialize */
+
+static void strcasecmp_utf8_init(void)
+{
+    f1 = vstring_alloc(100);
+    f2 = vstring_alloc(100);
+}
+
+/* strcasecmp_utf8x - caseless string comparison */
+
+int     strcasecmp_utf8x(int flags, const char *s1, const char *s2)
+{
+
+    /*
+     * Short-circuit optimization for ASCII-only text. This may be slower
+     * than using a cache for all results. We must not expose strcasecmp(3)
+     * to non-ASCII text.
+     */
+    if (allascii(s1) && allascii(s2))
+	return (strcasecmp(s1, s2));
+
+    if (f1 == 0)
+	strcasecmp_utf8_init();
+
+    /*
+     * Cross our fingers and hope that strcmp() remains agnostic of
+     * charactersets and locales.
+     */
+    flags &= CASEF_FLAG_UTF8;
+    casefoldx(flags, f1, s1, -1);
+    casefoldx(flags, f2, s2, -1);
+    return (strcmp(STR(f1), STR(f2)));
+}
+
+/* strncasecmp_utf8x - caseless string comparison */
+
+int     strncasecmp_utf8x(int flags, const char *s1, const char *s2,
+			          ssize_t len)
+{
+
+    /*
+     * Consider using a cache for all results.
+     */
+    if (f1 == 0)
+	strcasecmp_utf8_init();
+
+    /*
+     * Short-circuit optimization for ASCII-only text. This may be slower
+     * than using a cache for all results. See comments above for limitations
+     * of strcasecmp().
+     */
+    if (allascii_len(s1, len) && allascii_len(s2, len))
+	return (strncasecmp(s1, s2, len));
+
+    /*
+     * Caution: casefolding may change the number of bytes. See comments
+     * above for concerns about strcmp().
+     */
+    flags &= CASEF_FLAG_UTF8;
+    casefoldx(flags, f1, s1, len);
+    casefoldx(flags, f2, s2, len);
+    return (strcmp(STR(f1), STR(f2)));
+}
+
+#ifdef TEST
+#include <stdio.h>
+#include <stdlib.h>
+#include <vstream.h>
+#include <vstring_vstream.h>
+#include <msg_vstream.h>
+#include <argv.h>
+
+int     main(int argc, char **argv)
+{
+    VSTRING *buffer = vstring_alloc(1);
+    ARGV   *cmd;
+    char  **args;
+    int     len;
+    int     flags;
+    int     res;
+
+    msg_vstream_init(argv[0], VSTREAM_ERR);
+    flags = CASEF_FLAG_UTF8;
+    util_utf8_enable = 1;
+    while (vstring_fgets_nonl(buffer, VSTREAM_IN)) {
+	vstream_printf("> %s\n", STR(buffer));
+	cmd = argv_split(STR(buffer), CHARS_SPACE);
+	if (cmd->argc == 0 || cmd->argv[0][0] == '#')
+	    continue;
+	args = cmd->argv;
+
+	/*
+	 * Compare two strings.
+	 */
+	if (strcmp(args[0], "compare") == 0 && cmd->argc == 3) {
+	    res = strcasecmp_utf8x(flags, args[1], args[2]);
+	    vstream_printf("\"%s\" %s \"%s\"\n",
+			   args[1],
+			   res < 0 ? "<" : res == 0 ? "==" : ">",
+			   args[2]);
+	}
+
+	/*
+	 * Compare two substrings.
+	 */
+	else if (strcmp(args[0], "compare-len") == 0 && cmd->argc == 4
+		 && sscanf(args[3], "%d", &len) == 1 && len >= 0) {
+	    res = strncasecmp_utf8x(flags, args[1], args[2], len);
+	    vstream_printf("\"%.*s\" %s \"%.*s\"\n",
+			   len, args[1],
+			   res < 0 ? "<" : res == 0 ? "==" : ">",
+			   len, args[2]);
+	}
+
+	/*
+	 * Usage.
+	 */
+	else {
+	    vstream_printf("Usage: %s compare <s1> <s2> | compare-len <s1> <s2> <len>\n",
+			   argv[0]);
+	}
+	vstream_fflush(VSTREAM_OUT);
+	argv_free(cmd);
+    }
+    exit(0);
+}
+
+#endif					/* TEST */