From bf47a84713c6705326b0eb02e9fab7a061f86695 Mon Sep 17 00:00:00 2001
From: Vsevolod Stakhov <vsevolod@rambler-co.ru>
Date: Wed, 22 Apr 2009 18:15:43 +0400
Subject: [PATCH] * Fix variables substitution

---
 src/cfg_file.l  |  2 +-
 src/cfg_utils.c | 21 +++++++++++++--------
 src/main.c      |  1 -
 3 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/src/cfg_file.l b/src/cfg_file.l
index 77eeca0a9..ebabd3e0a 100644
--- a/src/cfg_file.l
+++ b/src/cfg_file.l
@@ -154,8 +154,8 @@ yes|YES|no|NO|[yY]|[nN]			yylval.flag=parse_flag(yytext); return FLAG;
 <module>\}  BEGIN(INITIAL); return EBRACE;
 <module>\;	return SEMICOLON;
 <module>=	return EQSIGN;
-<module>[a-zA-Z0-9_%-]+	yylval.string=strdup(yytext); return PARAM;
 <module>\$[a-zA-Z_][a-zA-Z0-9_]+		yylval.string=strdup(yytext + 1); return VARIABLE;
+<module>[a-zA-Z0-9_%-]+	yylval.string=strdup(yytext); return PARAM;
 <module>\".+[^\\]\"	yylval.string=strdup(yytext + 1); yylval.string[strlen(yylval.string) - 1] = '\0'; unescape_quotes(yylval.string); return QUOTEDSTRING;
 
 <lua>\n									/* ignore EOL */;
diff --git a/src/cfg_utils.c b/src/cfg_utils.c
index a68f057ec..4907ce64c 100644
--- a/src/cfg_utils.c
+++ b/src/cfg_utils.c
@@ -354,7 +354,7 @@ parse_flag (const char *str)
 char *
 substitute_variable (struct config_file *cfg, char *name, char *str, u_char recursive)
 {
-	char *var, *new, *v_begin, *v_end;
+	char *var, *new, *v_begin, *v_end, *p, t;
 	size_t len;
 	gboolean changed = FALSE;
 
@@ -362,30 +362,35 @@ substitute_variable (struct config_file *cfg, char *name, char *str, u_char recu
 		yywarn ("substitute_variable: trying to substitute variable in NULL string");
 		return NULL;
 	}
-
-	while ((v_begin = strstr (str, "${")) != NULL) {
+	
+	p = str;
+	while ((v_begin = strstr (p, "${")) != NULL) {
 		len = strlen (str);
 		*v_begin = '\0';
 		v_begin += 2;
 		if ((v_end = strstr (v_begin, "}")) == NULL) {
 			/* Not a variable, skip */
+			p = v_begin;
 			continue;
 		}
+		t = *v_end;
 		*v_end = '\0';
 		var = g_hash_table_lookup (cfg->variables, v_begin);
 		if (var == NULL) {
 			yywarn ("substitute_variable: variable %s is not defined", v_begin);
-			/* Substitute unknown variables with empty string */
-			var = "";
+			*v_end = t;
+			p = v_end + 1;
+			continue;
 		}
 		else if (recursive) {
-			new = substitute_variable (cfg, v_begin, var, recursive);
+			var = substitute_variable (cfg, v_begin, var, recursive);
 		}
 		/* Allocate new string */
 		new = memory_pool_alloc (cfg->cfg_pool, len - strlen (v_begin) + strlen (var) + 3);
 
 		snprintf (new, len - strlen (v_begin) + strlen (var) + 3, "%s(%s)%s",
 						str, var, v_end + 1);
+		p = new;
 		str = new;
 		changed = TRUE;
 	}
@@ -393,6 +398,7 @@ substitute_variable (struct config_file *cfg, char *name, char *str, u_char recu
 	if (changed && name != NULL) {
 		g_hash_table_insert (cfg->variables, name, str);
 	}
+
 	return str;
 }
 
@@ -414,10 +420,9 @@ static void
 substitute_all_variables (gpointer key, gpointer value, gpointer data)
 {
 	struct config_file *cfg = (struct config_file *)data;
-	char *new;
 
 	/* Do recursive substitution */
-	new = substitute_variable (cfg, (char *)key, (char *)value, 1);
+	(void)substitute_variable (cfg, (char *)key, (char *)value, 1);
 }
 
 static void
diff --git a/src/main.c b/src/main.c
index fcf3f3667..2bc79cf14 100644
--- a/src/main.c
+++ b/src/main.c
@@ -354,7 +354,6 @@ static void
 dump_cfg_vars ()
 {
 	g_hash_table_foreach (cfg->variables, dump_all_variables, NULL);
-	g_hash_table_foreach (cfg->modules_opts, dump_module_variables, NULL);
 }
 
 static int
-- 
2.39.5