Adding upstream version 3.4.23.upstream/3.4.23upstream

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

1 files changed, 179 insertions, 0 deletions

diff --git a/src/util/dict_random.c b/src/util/dict_random.c
new file mode 100644
index 0000000..5fab965
--- /dev/null
+++ b/src/util/dict_random.c
@@ -0,0 +1,179 @@
+/*++
+/* NAME
+/*	dict_random 3
+/* SUMMARY
+/*	dictionary manager interface for randomized tables
+/* SYNOPSIS
+/*	#include <dict_random.h>
+/*
+/*	DICT	*dict_random_open(name, open_flags, dict_flags)
+/*	const char *name;
+/*	int	open_flags;
+/*	int	dict_flags;
+/* DESCRIPTION
+/*	dict_random_open() opens an in-memory, read-only, table.
+/*	Example: "\fBrandmap:{\fIresult_1, ... ,result_n}\fR".
+/*
+/*	Each table query returns a random choice from the specified
+/*	results. Other table access methods are not supported.
+/*
+/*	The first and last characters of the "randmap:" table name
+/*	must be '{' and '}'. Within these, individual maps are
+/*	separated with comma or whitespace.
+/* SEE ALSO
+/*	dict(3) generic dictionary manager
+/* 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>
+
+/* Utility library. */
+
+#include <msg.h>
+#include <mymalloc.h>
+#include <myrand.h>
+#include <stringops.h>
+#include <dict_random.h>
+
+/* Application-specific. */
+
+typedef struct {
+    DICT    dict;			/* generic members */
+    ARGV   *replies;			/* reply values */
+} DICT_RANDOM;
+
+#define STR(x) vstring_str(x)
+
+/* dict_random_lookup - find randomized-table entry */
+
+static const char *dict_random_lookup(DICT *dict, const char *unused_query)
+{
+    DICT_RANDOM *dict_random = (DICT_RANDOM *) dict;
+
+    DICT_ERR_VAL_RETURN(dict, DICT_ERR_NONE,
+	 dict_random->replies->argv[myrand() % dict_random->replies->argc]);
+}
+
+/* dict_random_close - disassociate from randomized table */
+
+static void dict_random_close(DICT *dict)
+{
+    DICT_RANDOM *dict_random = (DICT_RANDOM *) dict;
+
+    if (dict_random->replies)
+	argv_free(dict_random->replies);
+    dict_free(dict);
+}
+
+static char *dict_random_parse_name(DICT *dict, ARGV **argv,
+				            const char *string,
+				            const char *delim,
+				            const char *parens)
+{
+    ARGV   *argvp = argv_alloc(1);
+    char   *saved_string = mystrdup(string);
+    char   *bp = saved_string;
+    char   *arg;
+    VSTRING *b64 = 0;
+    char   *err = 0;
+
+    while ((arg = mystrtokq(&bp, delim, parens)) != 0) {
+	if (dict->flags & DICT_FLAG_SRC_RHS_IS_FILE) {
+	    if ((b64 = dict_file_to_b64(dict, arg)) != 0) {
+		argv_add(argvp, vstring_str(b64), (char *) 0);
+	    } else {
+		err = dict_file_get_error(dict);
+		break;
+	    }
+	} else {
+	    argv_add(argvp, arg, (char *) 0);
+	}
+    }
+    argv_terminate(argvp);
+    myfree(saved_string);
+    *argv = argvp;
+    return (err);
+}
+
+/* dict_random_open - open a randomized table */
+
+DICT   *dict_random_open(const char *name, int open_flags, int dict_flags)
+{
+    DICT_RANDOM *dict_random;
+    char   *saved_name = 0;
+    size_t  len;
+    char   *err = 0;
+
+    /*
+     * Clarity first. Let the optimizer worry about redundant code.
+     */
+#define DICT_RANDOM_RETURN(x) do { \
+	DICT *__d = (x); \
+	if (saved_name != 0) \
+	    myfree(saved_name); \
+	if (err != 0) \
+	    myfree(err); \
+	return (__d); \
+    } while (0)
+
+    /*
+     * Sanity checks.
+     */
+    if (open_flags != O_RDONLY)
+	DICT_RANDOM_RETURN(dict_surrogate(DICT_TYPE_RANDOM, name,
+					  open_flags, dict_flags,
+				  "%s:%s map requires O_RDONLY access mode",
+					  DICT_TYPE_RANDOM, name));
+
+    /*
+     * Bundle up preliminary results.
+     */
+    dict_random =
+	(DICT_RANDOM *) dict_alloc(DICT_TYPE_RANDOM, name, sizeof(*dict_random));
+    dict_random->dict.lookup = dict_random_lookup;
+    dict_random->dict.close = dict_random_close;
+    dict_random->dict.flags = dict_flags | DICT_FLAG_PATTERN;
+    dict_random->replies = 0;
+    dict_random->dict.owner.status = DICT_OWNER_TRUSTED;
+    dict_random->dict.owner.uid = 0;
+
+    /*
+     * Split the name name into its constituent parts.
+     */
+    if ((len = balpar(name, CHARS_BRACE)) == 0 || name[len] != 0
+	|| *(saved_name = mystrndup(name + 1, len - 2)) == 0
+	|| (err = dict_random_parse_name(&dict_random->dict,
+					 &dict_random->replies, saved_name,
+					 CHARS_COMMA_SP, CHARS_BRACE)) != 0
+	|| dict_random->replies->argc == 0) {
+	dict_random_close(&dict_random->dict);
+	DICT_RANDOM_RETURN(err == 0 ?
+			   dict_surrogate(DICT_TYPE_RANDOM, name,
+					  open_flags, dict_flags,
+					  "bad syntax: \"%s:%s\"; "
+					  "need \"%s:{value...}\"",
+					  DICT_TYPE_RANDOM, name,
+					  DICT_TYPE_RANDOM) :
+			   dict_surrogate(DICT_TYPE_RANDOM, name,
+					  open_flags, dict_flags,
+					  "%s", err));
+    }
+    dict_file_purge_buffers(&dict_random->dict);
+    DICT_RANDOM_RETURN(DICT_DEBUG (&dict_random->dict));
+}