new file mode 100644
--- /dev/null
+++ b/src/typval.c
@@ -0,0 +1,1508 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * typval.c: functions that deal with a typval
+ */
+
+#include "vim.h"
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+
+/*
+ * Allocate memory for a variable type-value, and make it empty (0 or NULL
+ * value).
+ */
+    typval_T *
+alloc_tv(void)
+{
+    return ALLOC_CLEAR_ONE(typval_T);
+}
+
+/*
+ * Allocate memory for a variable type-value, and assign a string to it.
+ * The string "s" must have been allocated, it is consumed.
+ * Return NULL for out of memory, the variable otherwise.
+ */
+    typval_T *
+alloc_string_tv(char_u *s)
+{
+    typval_T	*rettv;
+
+    rettv = alloc_tv();
+    if (rettv != NULL)
+    {
+	rettv->v_type = VAR_STRING;
+	rettv->vval.v_string = s;
+    }
+    else
+	vim_free(s);
+    return rettv;
+}
+
+/*
+ * Free the memory for a variable type-value.
+ */
+    void
+free_tv(typval_T *varp)
+{
+    if (varp != NULL)
+    {
+	switch (varp->v_type)
+	{
+	    case VAR_FUNC:
+		func_unref(varp->vval.v_string);
+		// FALLTHROUGH
+	    case VAR_STRING:
+		vim_free(varp->vval.v_string);
+		break;
+	    case VAR_PARTIAL:
+		partial_unref(varp->vval.v_partial);
+		break;
+	    case VAR_BLOB:
+		blob_unref(varp->vval.v_blob);
+		break;
+	    case VAR_LIST:
+		list_unref(varp->vval.v_list);
+		break;
+	    case VAR_DICT:
+		dict_unref(varp->vval.v_dict);
+		break;
+	    case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+		job_unref(varp->vval.v_job);
+		break;
+#endif
+	    case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+		channel_unref(varp->vval.v_channel);
+		break;
+#endif
+	    case VAR_NUMBER:
+	    case VAR_FLOAT:
+	    case VAR_ANY:
+	    case VAR_UNKNOWN:
+	    case VAR_VOID:
+	    case VAR_BOOL:
+	    case VAR_SPECIAL:
+		break;
+	}
+	vim_free(varp);
+    }
+}
+
+/*
+ * Free the memory for a variable value and set the value to NULL or 0.
+ */
+    void
+clear_tv(typval_T *varp)
+{
+    if (varp != NULL)
+    {
+	switch (varp->v_type)
+	{
+	    case VAR_FUNC:
+		func_unref(varp->vval.v_string);
+		// FALLTHROUGH
+	    case VAR_STRING:
+		VIM_CLEAR(varp->vval.v_string);
+		break;
+	    case VAR_PARTIAL:
+		partial_unref(varp->vval.v_partial);
+		varp->vval.v_partial = NULL;
+		break;
+	    case VAR_BLOB:
+		blob_unref(varp->vval.v_blob);
+		varp->vval.v_blob = NULL;
+		break;
+	    case VAR_LIST:
+		list_unref(varp->vval.v_list);
+		varp->vval.v_list = NULL;
+		break;
+	    case VAR_DICT:
+		dict_unref(varp->vval.v_dict);
+		varp->vval.v_dict = NULL;
+		break;
+	    case VAR_NUMBER:
+	    case VAR_BOOL:
+	    case VAR_SPECIAL:
+		varp->vval.v_number = 0;
+		break;
+	    case VAR_FLOAT:
+#ifdef FEAT_FLOAT
+		varp->vval.v_float = 0.0;
+		break;
+#endif
+	    case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+		job_unref(varp->vval.v_job);
+		varp->vval.v_job = NULL;
+#endif
+		break;
+	    case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+		channel_unref(varp->vval.v_channel);
+		varp->vval.v_channel = NULL;
+#endif
+	    case VAR_UNKNOWN:
+	    case VAR_ANY:
+	    case VAR_VOID:
+		break;
+	}
+	varp->v_lock = 0;
+    }
+}
+
+/*
+ * Set the value of a variable to NULL without freeing items.
+ */
+    void
+init_tv(typval_T *varp)
+{
+    if (varp != NULL)
+	CLEAR_POINTER(varp);
+}
+
+/*
+ * Get the number value of a variable.
+ * If it is a String variable, uses vim_str2nr().
+ * For incompatible types, return 0.
+ * tv_get_number_chk() is similar to tv_get_number(), but informs the
+ * caller of incompatible types: it sets *denote to TRUE if "denote"
+ * is not NULL or returns -1 otherwise.
+ */
+    varnumber_T
+tv_get_number(typval_T *varp)
+{
+    int		error = FALSE;
+
+    return tv_get_number_chk(varp, &error);	// return 0L on error
+}
+
+    varnumber_T
+tv_get_number_chk(typval_T *varp, int *denote)
+{
+    varnumber_T	n = 0L;
+
+    switch (varp->v_type)
+    {
+	case VAR_NUMBER:
+	    return varp->vval.v_number;
+	case VAR_FLOAT:
+#ifdef FEAT_FLOAT
+	    emsg(_("E805: Using a Float as a Number"));
+	    break;
+#endif
+	case VAR_FUNC:
+	case VAR_PARTIAL:
+	    emsg(_("E703: Using a Funcref as a Number"));
+	    break;
+	case VAR_STRING:
+	    if (varp->vval.v_string != NULL)
+		vim_str2nr(varp->vval.v_string, NULL, NULL,
+					    STR2NR_ALL, &n, NULL, 0, FALSE);
+	    return n;
+	case VAR_LIST:
+	    emsg(_("E745: Using a List as a Number"));
+	    break;
+	case VAR_DICT:
+	    emsg(_("E728: Using a Dictionary as a Number"));
+	    break;
+	case VAR_BOOL:
+	case VAR_SPECIAL:
+	    return varp->vval.v_number == VVAL_TRUE ? 1 : 0;
+	case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+	    emsg(_("E910: Using a Job as a Number"));
+	    break;
+#endif
+	case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+	    emsg(_("E913: Using a Channel as a Number"));
+	    break;
+#endif
+	case VAR_BLOB:
+	    emsg(_("E974: Using a Blob as a Number"));
+	    break;
+	case VAR_UNKNOWN:
+	case VAR_ANY:
+	case VAR_VOID:
+	    internal_error_no_abort("tv_get_number(UNKNOWN)");
+	    break;
+    }
+    if (denote == NULL)		// useful for values that must be unsigned
+	n = -1;
+    else
+	*denote = TRUE;
+    return n;
+}
+
+#ifdef FEAT_FLOAT
+    float_T
+tv_get_float(typval_T *varp)
+{
+    switch (varp->v_type)
+    {
+	case VAR_NUMBER:
+	    return (float_T)(varp->vval.v_number);
+	case VAR_FLOAT:
+	    return varp->vval.v_float;
+	case VAR_FUNC:
+	case VAR_PARTIAL:
+	    emsg(_("E891: Using a Funcref as a Float"));
+	    break;
+	case VAR_STRING:
+	    emsg(_("E892: Using a String as a Float"));
+	    break;
+	case VAR_LIST:
+	    emsg(_("E893: Using a List as a Float"));
+	    break;
+	case VAR_DICT:
+	    emsg(_("E894: Using a Dictionary as a Float"));
+	    break;
+	case VAR_BOOL:
+	    emsg(_("E362: Using a boolean value as a Float"));
+	    break;
+	case VAR_SPECIAL:
+	    emsg(_("E907: Using a special value as a Float"));
+	    break;
+	case VAR_JOB:
+# ifdef FEAT_JOB_CHANNEL
+	    emsg(_("E911: Using a Job as a Float"));
+	    break;
+# endif
+	case VAR_CHANNEL:
+# ifdef FEAT_JOB_CHANNEL
+	    emsg(_("E914: Using a Channel as a Float"));
+	    break;
+# endif
+	case VAR_BLOB:
+	    emsg(_("E975: Using a Blob as a Float"));
+	    break;
+	case VAR_UNKNOWN:
+	case VAR_ANY:
+	case VAR_VOID:
+	    internal_error_no_abort("tv_get_float(UNKNOWN)");
+	    break;
+    }
+    return 0;
+}
+#endif
+
+/*
+ * Get the string value of a variable.
+ * If it is a Number variable, the number is converted into a string.
+ * tv_get_string() uses a single, static buffer.  YOU CAN ONLY USE IT ONCE!
+ * tv_get_string_buf() uses a given buffer.
+ * If the String variable has never been set, return an empty string.
+ * Never returns NULL;
+ * tv_get_string_chk() and tv_get_string_buf_chk() are similar, but return
+ * NULL on error.
+ */
+    char_u *
+tv_get_string(typval_T *varp)
+{
+    static char_u   mybuf[NUMBUFLEN];
+
+    return tv_get_string_buf(varp, mybuf);
+}
+
+    char_u *
+tv_get_string_buf(typval_T *varp, char_u *buf)
+{
+    char_u	*res =  tv_get_string_buf_chk(varp, buf);
+
+    return res != NULL ? res : (char_u *)"";
+}
+
+/*
+ * Careful: This uses a single, static buffer.  YOU CAN ONLY USE IT ONCE!
+ */
+    char_u *
+tv_get_string_chk(typval_T *varp)
+{
+    static char_u   mybuf[NUMBUFLEN];
+
+    return tv_get_string_buf_chk(varp, mybuf);
+}
+
+    char_u *
+tv_get_string_buf_chk(typval_T *varp, char_u *buf)
+{
+    switch (varp->v_type)
+    {
+	case VAR_NUMBER:
+	    vim_snprintf((char *)buf, NUMBUFLEN, "%lld",
+					    (varnumber_T)varp->vval.v_number);
+	    return buf;
+	case VAR_FUNC:
+	case VAR_PARTIAL:
+	    emsg(_("E729: using Funcref as a String"));
+	    break;
+	case VAR_LIST:
+	    emsg(_("E730: using List as a String"));
+	    break;
+	case VAR_DICT:
+	    emsg(_("E731: using Dictionary as a String"));
+	    break;
+	case VAR_FLOAT:
+#ifdef FEAT_FLOAT
+	    emsg(_(e_float_as_string));
+	    break;
+#endif
+	case VAR_STRING:
+	    if (varp->vval.v_string != NULL)
+		return varp->vval.v_string;
+	    return (char_u *)"";
+	case VAR_BOOL:
+	case VAR_SPECIAL:
+	    STRCPY(buf, get_var_special_name(varp->vval.v_number));
+	    return buf;
+        case VAR_BLOB:
+	    emsg(_("E976: using Blob as a String"));
+	    break;
+	case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+	    {
+		job_T *job = varp->vval.v_job;
+		char  *status;
+
+		if (job == NULL)
+		    return (char_u *)"no process";
+		status = job->jv_status == JOB_FAILED ? "fail"
+				: job->jv_status >= JOB_ENDED ? "dead"
+				: "run";
+# ifdef UNIX
+		vim_snprintf((char *)buf, NUMBUFLEN,
+			    "process %ld %s", (long)job->jv_pid, status);
+# elif defined(MSWIN)
+		vim_snprintf((char *)buf, NUMBUFLEN,
+			    "process %ld %s",
+			    (long)job->jv_proc_info.dwProcessId,
+			    status);
+# else
+		// fall-back
+		vim_snprintf((char *)buf, NUMBUFLEN, "process ? %s", status);
+# endif
+		return buf;
+	    }
+#endif
+	    break;
+	case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+	    {
+		channel_T *channel = varp->vval.v_channel;
+		char      *status = channel_status(channel, -1);
+
+		if (channel == NULL)
+		    vim_snprintf((char *)buf, NUMBUFLEN, "channel %s", status);
+		else
+		    vim_snprintf((char *)buf, NUMBUFLEN,
+				     "channel %d %s", channel->ch_id, status);
+		return buf;
+	    }
+#endif
+	    break;
+	case VAR_UNKNOWN:
+	case VAR_ANY:
+	case VAR_VOID:
+	    emsg(_(e_inval_string));
+	    break;
+    }
+    return NULL;
+}
+
+/*
+ * Turn a typeval into a string.  Similar to tv_get_string_buf() but uses
+ * string() on Dict, List, etc.
+ */
+    char_u *
+tv_stringify(typval_T *varp, char_u *buf)
+{
+    if (varp->v_type == VAR_LIST
+	    || varp->v_type == VAR_DICT
+	    || varp->v_type == VAR_BLOB
+	    || varp->v_type == VAR_FUNC
+	    || varp->v_type == VAR_PARTIAL
+	    || varp->v_type == VAR_FLOAT)
+    {
+	typval_T tmp;
+
+	f_string(varp, &tmp);
+	tv_get_string_buf(&tmp, buf);
+	clear_tv(varp);
+	*varp = tmp;
+	return tmp.vval.v_string;
+    }
+    return tv_get_string_buf(varp, buf);
+}
+
+/*
+ * Return TRUE if typeval "tv" and its value are set to be locked (immutable).
+ * Also give an error message, using "name" or _("name") when use_gettext is
+ * TRUE.
+ */
+    int
+tv_check_lock(typval_T *tv, char_u *name, int use_gettext)
+{
+    int	lock = 0;
+
+    switch (tv->v_type)
+    {
+	case VAR_BLOB:
+	    if (tv->vval.v_blob != NULL)
+		lock = tv->vval.v_blob->bv_lock;
+	    break;
+	case VAR_LIST:
+	    if (tv->vval.v_list != NULL)
+		lock = tv->vval.v_list->lv_lock;
+	    break;
+	case VAR_DICT:
+	    if (tv->vval.v_dict != NULL)
+		lock = tv->vval.v_dict->dv_lock;
+	    break;
+	default:
+	    break;
+    }
+    return var_check_lock(tv->v_lock, name, use_gettext)
+		    || (lock != 0 && var_check_lock(lock, name, use_gettext));
+}
+
+/*
+ * Copy the values from typval_T "from" to typval_T "to".
+ * When needed allocates string or increases reference count.
+ * Does not make a copy of a list, blob or dict but copies the reference!
+ * It is OK for "from" and "to" to point to the same item.  This is used to
+ * make a copy later.
+ */
+    void
+copy_tv(typval_T *from, typval_T *to)
+{
+    to->v_type = from->v_type;
+    to->v_lock = 0;
+    switch (from->v_type)
+    {
+	case VAR_NUMBER:
+	case VAR_BOOL:
+	case VAR_SPECIAL:
+	    to->vval.v_number = from->vval.v_number;
+	    break;
+	case VAR_FLOAT:
+#ifdef FEAT_FLOAT
+	    to->vval.v_float = from->vval.v_float;
+	    break;
+#endif
+	case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+	    to->vval.v_job = from->vval.v_job;
+	    if (to->vval.v_job != NULL)
+		++to->vval.v_job->jv_refcount;
+	    break;
+#endif
+	case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+	    to->vval.v_channel = from->vval.v_channel;
+	    if (to->vval.v_channel != NULL)
+		++to->vval.v_channel->ch_refcount;
+	    break;
+#endif
+	case VAR_STRING:
+	case VAR_FUNC:
+	    if (from->vval.v_string == NULL)
+		to->vval.v_string = NULL;
+	    else
+	    {
+		to->vval.v_string = vim_strsave(from->vval.v_string);
+		if (from->v_type == VAR_FUNC)
+		    func_ref(to->vval.v_string);
+	    }
+	    break;
+	case VAR_PARTIAL:
+	    if (from->vval.v_partial == NULL)
+		to->vval.v_partial = NULL;
+	    else
+	    {
+		to->vval.v_partial = from->vval.v_partial;
+		++to->vval.v_partial->pt_refcount;
+	    }
+	    break;
+	case VAR_BLOB:
+	    if (from->vval.v_blob == NULL)
+		to->vval.v_blob = NULL;
+	    else
+	    {
+		to->vval.v_blob = from->vval.v_blob;
+		++to->vval.v_blob->bv_refcount;
+	    }
+	    break;
+	case VAR_LIST:
+	    if (from->vval.v_list == NULL)
+		to->vval.v_list = NULL;
+	    else
+	    {
+		to->vval.v_list = from->vval.v_list;
+		++to->vval.v_list->lv_refcount;
+	    }
+	    break;
+	case VAR_DICT:
+	    if (from->vval.v_dict == NULL)
+		to->vval.v_dict = NULL;
+	    else
+	    {
+		to->vval.v_dict = from->vval.v_dict;
+		++to->vval.v_dict->dv_refcount;
+	    }
+	    break;
+	case VAR_UNKNOWN:
+	case VAR_ANY:
+	case VAR_VOID:
+	    internal_error_no_abort("copy_tv(UNKNOWN)");
+	    break;
+    }
+}
+
+/*
+ * Compare "typ1" and "typ2".  Put the result in "typ1".
+ */
+    int
+typval_compare(
+    typval_T	*typ1,   // first operand
+    typval_T	*typ2,   // second operand
+    exptype_T	type,    // operator
+    int		ic)      // ignore case
+{
+    int		i;
+    varnumber_T	n1, n2;
+    char_u	*s1, *s2;
+    char_u	buf1[NUMBUFLEN], buf2[NUMBUFLEN];
+    int		type_is = type == EXPR_IS || type == EXPR_ISNOT;
+
+    if (type_is && typ1->v_type != typ2->v_type)
+    {
+	// For "is" a different type always means FALSE, for "notis"
+	// it means TRUE.
+	n1 = (type == EXPR_ISNOT);
+    }
+    else if (typ1->v_type == VAR_BLOB || typ2->v_type == VAR_BLOB)
+    {
+	if (type_is)
+	{
+	    n1 = (typ1->v_type == typ2->v_type
+			    && typ1->vval.v_blob == typ2->vval.v_blob);
+	    if (type == EXPR_ISNOT)
+		n1 = !n1;
+	}
+	else if (typ1->v_type != typ2->v_type
+		|| (type != EXPR_EQUAL && type != EXPR_NEQUAL))
+	{
+	    if (typ1->v_type != typ2->v_type)
+		emsg(_("E977: Can only compare Blob with Blob"));
+	    else
+		emsg(_(e_invalblob));
+	    clear_tv(typ1);
+	    return FAIL;
+	}
+	else
+	{
+	    // Compare two Blobs for being equal or unequal.
+	    n1 = blob_equal(typ1->vval.v_blob, typ2->vval.v_blob);
+	    if (type == EXPR_NEQUAL)
+		n1 = !n1;
+	}
+    }
+    else if (typ1->v_type == VAR_LIST || typ2->v_type == VAR_LIST)
+    {
+	if (type_is)
+	{
+	    n1 = (typ1->v_type == typ2->v_type
+			    && typ1->vval.v_list == typ2->vval.v_list);
+	    if (type == EXPR_ISNOT)
+		n1 = !n1;
+	}
+	else if (typ1->v_type != typ2->v_type
+		|| (type != EXPR_EQUAL && type != EXPR_NEQUAL))
+	{
+	    if (typ1->v_type != typ2->v_type)
+		emsg(_("E691: Can only compare List with List"));
+	    else
+		emsg(_("E692: Invalid operation for List"));
+	    clear_tv(typ1);
+	    return FAIL;
+	}
+	else
+	{
+	    // Compare two Lists for being equal or unequal.
+	    n1 = list_equal(typ1->vval.v_list, typ2->vval.v_list,
+							    ic, FALSE);
+	    if (type == EXPR_NEQUAL)
+		n1 = !n1;
+	}
+    }
+
+    else if (typ1->v_type == VAR_DICT || typ2->v_type == VAR_DICT)
+    {
+	if (type_is)
+	{
+	    n1 = (typ1->v_type == typ2->v_type
+			    && typ1->vval.v_dict == typ2->vval.v_dict);
+	    if (type == EXPR_ISNOT)
+		n1 = !n1;
+	}
+	else if (typ1->v_type != typ2->v_type
+		|| (type != EXPR_EQUAL && type != EXPR_NEQUAL))
+	{
+	    if (typ1->v_type != typ2->v_type)
+		emsg(_("E735: Can only compare Dictionary with Dictionary"));
+	    else
+		emsg(_("E736: Invalid operation for Dictionary"));
+	    clear_tv(typ1);
+	    return FAIL;
+	}
+	else
+	{
+	    // Compare two Dictionaries for being equal or unequal.
+	    n1 = dict_equal(typ1->vval.v_dict, typ2->vval.v_dict,
+							    ic, FALSE);
+	    if (type == EXPR_NEQUAL)
+		n1 = !n1;
+	}
+    }
+
+    else if (typ1->v_type == VAR_FUNC || typ2->v_type == VAR_FUNC
+	|| typ1->v_type == VAR_PARTIAL || typ2->v_type == VAR_PARTIAL)
+    {
+	if (type != EXPR_EQUAL && type != EXPR_NEQUAL
+		&& type != EXPR_IS && type != EXPR_ISNOT)
+	{
+	    emsg(_("E694: Invalid operation for Funcrefs"));
+	    clear_tv(typ1);
+	    return FAIL;
+	}
+	if ((typ1->v_type == VAR_PARTIAL
+					&& typ1->vval.v_partial == NULL)
+		|| (typ2->v_type == VAR_PARTIAL
+					&& typ2->vval.v_partial == NULL))
+	    // When both partials are NULL, then they are equal.
+	    // Otherwise they are not equal.
+	    n1 = (typ1->vval.v_partial == typ2->vval.v_partial);
+	else if (type_is)
+	{
+	    if (typ1->v_type == VAR_FUNC && typ2->v_type == VAR_FUNC)
+		// strings are considered the same if their value is
+		// the same
+		n1 = tv_equal(typ1, typ2, ic, FALSE);
+	    else if (typ1->v_type == VAR_PARTIAL
+					&& typ2->v_type == VAR_PARTIAL)
+		n1 = (typ1->vval.v_partial == typ2->vval.v_partial);
+	    else
+		n1 = FALSE;
+	}
+	else
+	    n1 = tv_equal(typ1, typ2, ic, FALSE);
+	if (type == EXPR_NEQUAL || type == EXPR_ISNOT)
+	    n1 = !n1;
+    }
+
+#ifdef FEAT_FLOAT
+    // If one of the two variables is a float, compare as a float.
+    // When using "=~" or "!~", always compare as string.
+    else if ((typ1->v_type == VAR_FLOAT || typ2->v_type == VAR_FLOAT)
+	    && type != EXPR_MATCH && type != EXPR_NOMATCH)
+    {
+	float_T f1, f2;
+
+	f1 = tv_get_float(typ1);
+	f2 = tv_get_float(typ2);
+	n1 = FALSE;
+	switch (type)
+	{
+	    case EXPR_IS:
+	    case EXPR_EQUAL:    n1 = (f1 == f2); break;
+	    case EXPR_ISNOT:
+	    case EXPR_NEQUAL:   n1 = (f1 != f2); break;
+	    case EXPR_GREATER:  n1 = (f1 > f2); break;
+	    case EXPR_GEQUAL:   n1 = (f1 >= f2); break;
+	    case EXPR_SMALLER:  n1 = (f1 < f2); break;
+	    case EXPR_SEQUAL:   n1 = (f1 <= f2); break;
+	    case EXPR_UNKNOWN:
+	    case EXPR_MATCH:
+	    default:  break;  // avoid gcc warning
+	}
+    }
+#endif
+
+    // If one of the two variables is a number, compare as a number.
+    // When using "=~" or "!~", always compare as string.
+    else if ((typ1->v_type == VAR_NUMBER || typ2->v_type == VAR_NUMBER)
+	    && type != EXPR_MATCH && type != EXPR_NOMATCH)
+    {
+	n1 = tv_get_number(typ1);
+	n2 = tv_get_number(typ2);
+	switch (type)
+	{
+	    case EXPR_IS:
+	    case EXPR_EQUAL:    n1 = (n1 == n2); break;
+	    case EXPR_ISNOT:
+	    case EXPR_NEQUAL:   n1 = (n1 != n2); break;
+	    case EXPR_GREATER:  n1 = (n1 > n2); break;
+	    case EXPR_GEQUAL:   n1 = (n1 >= n2); break;
+	    case EXPR_SMALLER:  n1 = (n1 < n2); break;
+	    case EXPR_SEQUAL:   n1 = (n1 <= n2); break;
+	    case EXPR_UNKNOWN:
+	    case EXPR_MATCH:
+	    default:  break;  // avoid gcc warning
+	}
+    }
+    else
+    {
+	s1 = tv_get_string_buf(typ1, buf1);
+	s2 = tv_get_string_buf(typ2, buf2);
+	if (type != EXPR_MATCH && type != EXPR_NOMATCH)
+	    i = ic ? MB_STRICMP(s1, s2) : STRCMP(s1, s2);
+	else
+	    i = 0;
+	n1 = FALSE;
+	switch (type)
+	{
+	    case EXPR_IS:
+	    case EXPR_EQUAL:    n1 = (i == 0); break;
+	    case EXPR_ISNOT:
+	    case EXPR_NEQUAL:   n1 = (i != 0); break;
+	    case EXPR_GREATER:  n1 = (i > 0); break;
+	    case EXPR_GEQUAL:   n1 = (i >= 0); break;
+	    case EXPR_SMALLER:  n1 = (i < 0); break;
+	    case EXPR_SEQUAL:   n1 = (i <= 0); break;
+
+	    case EXPR_MATCH:
+	    case EXPR_NOMATCH:
+		    n1 = pattern_match(s2, s1, ic);
+		    if (type == EXPR_NOMATCH)
+			n1 = !n1;
+		    break;
+
+	    default:  break;  // avoid gcc warning
+	}
+    }
+    clear_tv(typ1);
+    typ1->v_type = VAR_NUMBER;
+    typ1->vval.v_number = n1;
+
+    return OK;
+}
+
+    char_u *
+typval_tostring(typval_T *arg)
+{
+    char_u	*tofree;
+    char_u	numbuf[NUMBUFLEN];
+    char_u	*ret = NULL;
+
+    if (arg == NULL)
+	return vim_strsave((char_u *)"(does not exist)");
+    ret = tv2string(arg, &tofree, numbuf, 0);
+    // Make a copy if we have a value but it's not in allocated memory.
+    if (ret != NULL && tofree == NULL)
+	ret = vim_strsave(ret);
+    return ret;
+}
+
+/*
+ * Return TRUE if typeval "tv" is locked: Either that value is locked itself
+ * or it refers to a List or Dictionary that is locked.
+ */
+    int
+tv_islocked(typval_T *tv)
+{
+    return (tv->v_lock & VAR_LOCKED)
+	|| (tv->v_type == VAR_LIST
+		&& tv->vval.v_list != NULL
+		&& (tv->vval.v_list->lv_lock & VAR_LOCKED))
+	|| (tv->v_type == VAR_DICT
+		&& tv->vval.v_dict != NULL
+		&& (tv->vval.v_dict->dv_lock & VAR_LOCKED));
+}
+
+    static int
+func_equal(
+    typval_T *tv1,
+    typval_T *tv2,
+    int	     ic)	    // ignore case
+{
+    char_u	*s1, *s2;
+    dict_T	*d1, *d2;
+    int		a1, a2;
+    int		i;
+
+    // empty and NULL function name considered the same
+    s1 = tv1->v_type == VAR_FUNC ? tv1->vval.v_string
+					   : partial_name(tv1->vval.v_partial);
+    if (s1 != NULL && *s1 == NUL)
+	s1 = NULL;
+    s2 = tv2->v_type == VAR_FUNC ? tv2->vval.v_string
+					   : partial_name(tv2->vval.v_partial);
+    if (s2 != NULL && *s2 == NUL)
+	s2 = NULL;
+    if (s1 == NULL || s2 == NULL)
+    {
+	if (s1 != s2)
+	    return FALSE;
+    }
+    else if (STRCMP(s1, s2) != 0)
+	return FALSE;
+
+    // empty dict and NULL dict is different
+    d1 = tv1->v_type == VAR_FUNC ? NULL : tv1->vval.v_partial->pt_dict;
+    d2 = tv2->v_type == VAR_FUNC ? NULL : tv2->vval.v_partial->pt_dict;
+    if (d1 == NULL || d2 == NULL)
+    {
+	if (d1 != d2)
+	    return FALSE;
+    }
+    else if (!dict_equal(d1, d2, ic, TRUE))
+	return FALSE;
+
+    // empty list and no list considered the same
+    a1 = tv1->v_type == VAR_FUNC ? 0 : tv1->vval.v_partial->pt_argc;
+    a2 = tv2->v_type == VAR_FUNC ? 0 : tv2->vval.v_partial->pt_argc;
+    if (a1 != a2)
+	return FALSE;
+    for (i = 0; i < a1; ++i)
+	if (!tv_equal(tv1->vval.v_partial->pt_argv + i,
+		      tv2->vval.v_partial->pt_argv + i, ic, TRUE))
+	    return FALSE;
+
+    return TRUE;
+}
+
+/*
+ * Return TRUE if "tv1" and "tv2" have the same value.
+ * Compares the items just like "==" would compare them, but strings and
+ * numbers are different.  Floats and numbers are also different.
+ */
+    int
+tv_equal(
+    typval_T *tv1,
+    typval_T *tv2,
+    int	     ic,	    // ignore case
+    int	     recursive)	    // TRUE when used recursively
+{
+    char_u	buf1[NUMBUFLEN], buf2[NUMBUFLEN];
+    char_u	*s1, *s2;
+    static int  recursive_cnt = 0;	    // catch recursive loops
+    int		r;
+    static int	tv_equal_recurse_limit;
+
+    // Catch lists and dicts that have an endless loop by limiting
+    // recursiveness to a limit.  We guess they are equal then.
+    // A fixed limit has the problem of still taking an awful long time.
+    // Reduce the limit every time running into it. That should work fine for
+    // deeply linked structures that are not recursively linked and catch
+    // recursiveness quickly.
+    if (!recursive)
+	tv_equal_recurse_limit = 1000;
+    if (recursive_cnt >= tv_equal_recurse_limit)
+    {
+	--tv_equal_recurse_limit;
+	return TRUE;
+    }
+
+    // For VAR_FUNC and VAR_PARTIAL compare the function name, bound dict and
+    // arguments.
+    if ((tv1->v_type == VAR_FUNC
+		|| (tv1->v_type == VAR_PARTIAL && tv1->vval.v_partial != NULL))
+	    && (tv2->v_type == VAR_FUNC
+		|| (tv2->v_type == VAR_PARTIAL && tv2->vval.v_partial != NULL)))
+    {
+	++recursive_cnt;
+	r = func_equal(tv1, tv2, ic);
+	--recursive_cnt;
+	return r;
+    }
+
+    if (tv1->v_type != tv2->v_type)
+	return FALSE;
+
+    switch (tv1->v_type)
+    {
+	case VAR_LIST:
+	    ++recursive_cnt;
+	    r = list_equal(tv1->vval.v_list, tv2->vval.v_list, ic, TRUE);
+	    --recursive_cnt;
+	    return r;
+
+	case VAR_DICT:
+	    ++recursive_cnt;
+	    r = dict_equal(tv1->vval.v_dict, tv2->vval.v_dict, ic, TRUE);
+	    --recursive_cnt;
+	    return r;
+
+	case VAR_BLOB:
+	    return blob_equal(tv1->vval.v_blob, tv2->vval.v_blob);
+
+	case VAR_NUMBER:
+	case VAR_BOOL:
+	case VAR_SPECIAL:
+	    return tv1->vval.v_number == tv2->vval.v_number;
+
+	case VAR_STRING:
+	    s1 = tv_get_string_buf(tv1, buf1);
+	    s2 = tv_get_string_buf(tv2, buf2);
+	    return ((ic ? MB_STRICMP(s1, s2) : STRCMP(s1, s2)) == 0);
+
+	case VAR_FLOAT:
+#ifdef FEAT_FLOAT
+	    return tv1->vval.v_float == tv2->vval.v_float;
+#endif
+	case VAR_JOB:
+#ifdef FEAT_JOB_CHANNEL
+	    return tv1->vval.v_job == tv2->vval.v_job;
+#endif
+	case VAR_CHANNEL:
+#ifdef FEAT_JOB_CHANNEL
+	    return tv1->vval.v_channel == tv2->vval.v_channel;
+#endif
+
+	case VAR_PARTIAL:
+	    return tv1->vval.v_partial == tv2->vval.v_partial;
+
+	case VAR_FUNC:
+	    return tv1->vval.v_string == tv2->vval.v_string;
+
+	case VAR_UNKNOWN:
+	case VAR_ANY:
+	case VAR_VOID:
+	    break;
+    }
+
+    // VAR_UNKNOWN can be the result of a invalid expression, let's say it
+    // does not equal anything, not even itself.
+    return FALSE;
+}
+
+/*
+ * Get an option value.
+ * "arg" points to the '&' or '+' before the option name.
+ * "arg" is advanced to character after the option name.
+ * Return OK or FAIL.
+ */
+    int
+get_option_tv(
+    char_u	**arg,
+    typval_T	*rettv,	// when NULL, only check if option exists
+    int		evaluate)
+{
+    char_u	*option_end;
+    long	numval;
+    char_u	*stringval;
+    int		opt_type;
+    int		c;
+    int		working = (**arg == '+');    // has("+option")
+    int		ret = OK;
+    int		opt_flags;
+
+    // Isolate the option name and find its value.
+    option_end = find_option_end(arg, &opt_flags);
+    if (option_end == NULL)
+    {
+	if (rettv != NULL)
+	    semsg(_("E112: Option name missing: %s"), *arg);
+	return FAIL;
+    }
+
+    if (!evaluate)
+    {
+	*arg = option_end;
+	return OK;
+    }
+
+    c = *option_end;
+    *option_end = NUL;
+    opt_type = get_option_value(*arg, &numval,
+			       rettv == NULL ? NULL : &stringval, opt_flags);
+
+    if (opt_type == -3)			// invalid name
+    {
+	if (rettv != NULL)
+	    semsg(_(e_unknown_option), *arg);
+	ret = FAIL;
+    }
+    else if (rettv != NULL)
+    {
+	if (opt_type == -2)		// hidden string option
+	{
+	    rettv->v_type = VAR_STRING;
+	    rettv->vval.v_string = NULL;
+	}
+	else if (opt_type == -1)	// hidden number option
+	{
+	    rettv->v_type = VAR_NUMBER;
+	    rettv->vval.v_number = 0;
+	}
+	else if (opt_type == 1)		// number option
+	{
+	    rettv->v_type = VAR_NUMBER;
+	    rettv->vval.v_number = numval;
+	}
+	else				// string option
+	{
+	    rettv->v_type = VAR_STRING;
+	    rettv->vval.v_string = stringval;
+	}
+    }
+    else if (working && (opt_type == -2 || opt_type == -1))
+	ret = FAIL;
+
+    *option_end = c;		    // put back for error messages
+    *arg = option_end;
+
+    return ret;
+}
+
+/*
+ * Allocate a variable for a number constant.  Also deals with "0z" for blob.
+ * Return OK or FAIL.
+ */
+    int
+get_number_tv(
+	char_u	    **arg,
+	typval_T    *rettv,
+	int	    evaluate,
+	int	    want_string UNUSED)
+{
+    int		len;
+#ifdef FEAT_FLOAT
+    char_u	*p;
+    int		get_float = FALSE;
+
+    // We accept a float when the format matches
+    // "[0-9]\+\.[0-9]\+\([eE][+-]\?[0-9]\+\)\?".  This is very
+    // strict to avoid backwards compatibility problems.
+    // With script version 2 and later the leading digit can be
+    // omitted.
+    // Don't look for a float after the "." operator, so that
+    // ":let vers = 1.2.3" doesn't fail.
+    if (**arg == '.')
+	p = *arg;
+    else
+	p = skipdigits(*arg + 1);
+    if (!want_string && p[0] == '.' && vim_isdigit(p[1]))
+    {
+	get_float = TRUE;
+	p = skipdigits(p + 2);
+	if (*p == 'e' || *p == 'E')
+	{
+	    ++p;
+	    if (*p == '-' || *p == '+')
+		++p;
+	    if (!vim_isdigit(*p))
+		get_float = FALSE;
+	    else
+		p = skipdigits(p + 1);
+	}
+	if (ASCII_ISALPHA(*p) || *p == '.')
+	    get_float = FALSE;
+    }
+    if (get_float)
+    {
+	float_T	f;
+
+	*arg += string2float(*arg, &f);
+	if (evaluate)
+	{
+	    rettv->v_type = VAR_FLOAT;
+	    rettv->vval.v_float = f;
+	}
+    }
+    else
+#endif
+    if (**arg == '0' && ((*arg)[1] == 'z' || (*arg)[1] == 'Z'))
+    {
+	char_u  *bp;
+	blob_T  *blob = NULL;  // init for gcc
+
+	// Blob constant: 0z0123456789abcdef
+	if (evaluate)
+	    blob = blob_alloc();
+	for (bp = *arg + 2; vim_isxdigit(bp[0]); bp += 2)
+	{
+	    if (!vim_isxdigit(bp[1]))
+	    {
+		if (blob != NULL)
+		{
+		    emsg(_("E973: Blob literal should have an even number of hex characters"));
+		    ga_clear(&blob->bv_ga);
+		    VIM_CLEAR(blob);
+		}
+		return FAIL;
+	    }
+	    if (blob != NULL)
+		ga_append(&blob->bv_ga,
+			     (hex2nr(*bp) << 4) + hex2nr(*(bp+1)));
+	    if (bp[2] == '.' && vim_isxdigit(bp[3]))
+		++bp;
+	}
+	if (blob != NULL)
+	    rettv_blob_set(rettv, blob);
+	*arg = bp;
+    }
+    else
+    {
+	varnumber_T	n;
+
+	// decimal, hex or octal number
+	vim_str2nr(*arg, NULL, &len, current_sctx.sc_version >= 4
+		      ? STR2NR_NO_OCT + STR2NR_QUOTE
+		      : STR2NR_ALL, &n, NULL, 0, TRUE);
+	if (len == 0)
+	{
+	    semsg(_(e_invexpr2), *arg);
+	    return FAIL;
+	}
+	*arg += len;
+	if (evaluate)
+	{
+	    rettv->v_type = VAR_NUMBER;
+	    rettv->vval.v_number = n;
+	}
+    }
+    return OK;
+}
+
+/*
+ * Allocate a variable for a string constant.
+ * Return OK or FAIL.
+ */
+    int
+get_string_tv(char_u **arg, typval_T *rettv, int evaluate)
+{
+    char_u	*p;
+    char_u	*name;
+    int		extra = 0;
+    int		len;
+
+    // Find the end of the string, skipping backslashed characters.
+    for (p = *arg + 1; *p != NUL && *p != '"'; MB_PTR_ADV(p))
+    {
+	if (*p == '\\' && p[1] != NUL)
+	{
+	    ++p;
+	    // A "\<x>" form occupies at least 4 characters, and produces up
+	    // to 21 characters (3 * 6 for the char and 3 for a modifier):
+	    // reserve space for 18 extra.
+	    // Each byte in the char could be encoded as K_SPECIAL K_EXTRA x.
+	    if (*p == '<')
+		extra += 18;
+	}
+    }
+
+    if (*p != '"')
+    {
+	semsg(_("E114: Missing quote: %s"), *arg);
+	return FAIL;
+    }
+
+    // If only parsing, set *arg and return here
+    if (!evaluate)
+    {
+	*arg = p + 1;
+	return OK;
+    }
+
+    // Copy the string into allocated memory, handling backslashed
+    // characters.
+    len = (int)(p - *arg + extra);
+    name = alloc(len);
+    if (name == NULL)
+	return FAIL;
+    rettv->v_type = VAR_STRING;
+    rettv->vval.v_string = name;
+
+    for (p = *arg + 1; *p != NUL && *p != '"'; )
+    {
+	if (*p == '\\')
+	{
+	    switch (*++p)
+	    {
+		case 'b': *name++ = BS; ++p; break;
+		case 'e': *name++ = ESC; ++p; break;
+		case 'f': *name++ = FF; ++p; break;
+		case 'n': *name++ = NL; ++p; break;
+		case 'r': *name++ = CAR; ++p; break;
+		case 't': *name++ = TAB; ++p; break;
+
+		case 'X': // hex: "\x1", "\x12"
+		case 'x':
+		case 'u': // Unicode: "\u0023"
+		case 'U':
+			  if (vim_isxdigit(p[1]))
+			  {
+			      int	n, nr;
+			      int	c = toupper(*p);
+
+			      if (c == 'X')
+				  n = 2;
+			      else if (*p == 'u')
+				  n = 4;
+			      else
+				  n = 8;
+			      nr = 0;
+			      while (--n >= 0 && vim_isxdigit(p[1]))
+			      {
+				  ++p;
+				  nr = (nr << 4) + hex2nr(*p);
+			      }
+			      ++p;
+			      // For "\u" store the number according to
+			      // 'encoding'.
+			      if (c != 'X')
+				  name += (*mb_char2bytes)(nr, name);
+			      else
+				  *name++ = nr;
+			  }
+			  break;
+
+			  // octal: "\1", "\12", "\123"
+		case '0':
+		case '1':
+		case '2':
+		case '3':
+		case '4':
+		case '5':
+		case '6':
+		case '7': *name = *p++ - '0';
+			  if (*p >= '0' && *p <= '7')
+			  {
+			      *name = (*name << 3) + *p++ - '0';
+			      if (*p >= '0' && *p <= '7')
+				  *name = (*name << 3) + *p++ - '0';
+			  }
+			  ++name;
+			  break;
+
+			    // Special key, e.g.: "\<C-W>"
+		case '<': extra = trans_special(&p, name, TRUE, TRUE,
+								   TRUE, NULL);
+			  if (extra != 0)
+			  {
+			      name += extra;
+			      if (name >= rettv->vval.v_string + len)
+				  iemsg("get_string_tv() used more space than allocated");
+			      break;
+			  }
+			  // FALLTHROUGH
+
+		default:  MB_COPY_CHAR(p, name);
+			  break;
+	    }
+	}
+	else
+	    MB_COPY_CHAR(p, name);
+
+    }
+    *name = NUL;
+    if (*p != NUL) // just in case
+	++p;
+    *arg = p;
+
+    return OK;
+}
+
+/*
+ * Allocate a variable for a 'str''ing' constant.
+ * Return OK or FAIL.
+ */
+    int
+get_lit_string_tv(char_u **arg, typval_T *rettv, int evaluate)
+{
+    char_u	*p;
+    char_u	*str;
+    int		reduce = 0;
+
+    // Find the end of the string, skipping ''.
+    for (p = *arg + 1; *p != NUL; MB_PTR_ADV(p))
+    {
+	if (*p == '\'')
+	{
+	    if (p[1] != '\'')
+		break;
+	    ++reduce;
+	    ++p;
+	}
+    }
+
+    if (*p != '\'')
+    {
+	semsg(_("E115: Missing quote: %s"), *arg);
+	return FAIL;
+    }
+
+    // If only parsing return after setting "*arg"
+    if (!evaluate)
+    {
+	*arg = p + 1;
+	return OK;
+    }
+
+    // Copy the string into allocated memory, handling '' to ' reduction.
+    str = alloc((p - *arg) - reduce);
+    if (str == NULL)
+	return FAIL;
+    rettv->v_type = VAR_STRING;
+    rettv->vval.v_string = str;
+
+    for (p = *arg + 1; *p != NUL; )
+    {
+	if (*p == '\'')
+	{
+	    if (p[1] != '\'')
+		break;
+	    ++p;
+	}
+	MB_COPY_CHAR(p, str);
+    }
+    *str = NUL;
+    *arg = p + 1;
+
+    return OK;
+}
+
+/*
+ * Return a string with the string representation of a variable.
+ * If the memory is allocated "tofree" is set to it, otherwise NULL.
+ * "numbuf" is used for a number.
+ * Puts quotes around strings, so that they can be parsed back by eval().
+ * May return NULL.
+ */
+    char_u *
+tv2string(
+    typval_T	*tv,
+    char_u	**tofree,
+    char_u	*numbuf,
+    int		copyID)
+{
+    return echo_string_core(tv, tofree, numbuf, copyID, FALSE, TRUE, FALSE);
+}
+
+/*
+ * Get the value of an environment variable.
+ * "arg" is pointing to the '$'.  It is advanced to after the name.
+ * If the environment variable was not set, silently assume it is empty.
+ * Return FAIL if the name is invalid.
+ */
+    int
+get_env_tv(char_u **arg, typval_T *rettv, int evaluate)
+{
+    char_u	*string = NULL;
+    int		len;
+    int		cc;
+    char_u	*name;
+    int		mustfree = FALSE;
+
+    ++*arg;
+    name = *arg;
+    len = get_env_len(arg);
+    if (evaluate)
+    {
+	if (len == 0)
+	    return FAIL; // invalid empty name
+
+	cc = name[len];
+	name[len] = NUL;
+	// first try vim_getenv(), fast for normal environment vars
+	string = vim_getenv(name, &mustfree);
+	if (string != NULL && *string != NUL)
+	{
+	    if (!mustfree)
+		string = vim_strsave(string);
+	}
+	else
+	{
+	    if (mustfree)
+		vim_free(string);
+
+	    // next try expanding things like $VIM and ${HOME}
+	    string = expand_env_save(name - 1);
+	    if (string != NULL && *string == '$')
+		VIM_CLEAR(string);
+	}
+	name[len] = cc;
+
+	rettv->v_type = VAR_STRING;
+	rettv->vval.v_string = string;
+    }
+
+    return OK;
+}
+
+/*
+ * Get the lnum from the first argument.
+ * Also accepts ".", "$", etc., but that only works for the current buffer.
+ * Returns -1 on error.
+ */
+    linenr_T
+tv_get_lnum(typval_T *argvars)
+{
+    linenr_T	lnum;
+
+    lnum = (linenr_T)tv_get_number_chk(&argvars[0], NULL);
+    if (lnum == 0)  // no valid number, try using arg like line()
+    {
+	int	fnum;
+	pos_T	*fp = var2fpos(&argvars[0], TRUE, &fnum);
+
+	if (fp != NULL)
+	    lnum = fp->lnum;
+    }
+    return lnum;
+}
+
+/*
+ * Get the lnum from the first argument.
+ * Also accepts "$", then "buf" is used.
+ * Returns 0 on error.
+ */
+    linenr_T
+tv_get_lnum_buf(typval_T *argvars, buf_T *buf)
+{
+    if (argvars[0].v_type == VAR_STRING
+	    && argvars[0].vval.v_string != NULL
+	    && argvars[0].vval.v_string[0] == '$'
+	    && buf != NULL)
+	return buf->b_ml.ml_line_count;
+    return (linenr_T)tv_get_number_chk(&argvars[0], NULL);
+}
+
+/*
+ * Get buffer by number or pattern.
+ */
+    buf_T *
+tv_get_buf(typval_T *tv, int curtab_only)
+{
+    char_u	*name = tv->vval.v_string;
+    buf_T	*buf;
+
+    if (tv->v_type == VAR_NUMBER)
+	return buflist_findnr((int)tv->vval.v_number);
+    if (tv->v_type != VAR_STRING)
+	return NULL;
+    if (name == NULL || *name == NUL)
+	return curbuf;
+    if (name[0] == '$' && name[1] == NUL)
+	return lastbuf;
+
+    buf = buflist_find_by_name(name, curtab_only);
+
+    // If not found, try expanding the name, like done for bufexists().
+    if (buf == NULL)
+	buf = find_buffer(tv);
+
+    return buf;
+}
+
+#endif // FEAT_EVAL