autofs-5.0.9 - amd lookup fix old conf handling

From: Ian Kent <ikent@redhat.com>

When the configuration changed to using lower case option names
old configuration files with upper case names stopped working.

This is because, for configuration option lookup the hash of
the option string always needs to be the same case, which was
overlooked at the time.

Also fix a couple of other things, possible incorect return
from conf_update() what adding a new entry and change to using
isblank() instead of checking for a space only.
---
 lib/defaults.c |   27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/lib/defaults.c b/lib/defaults.c
index 3fa2216..7043dfc 100644
--- a/lib/defaults.c
+++ b/lib/defaults.c
@@ -43,6 +43,7 @@
 #define OLD_CONFIG_FILE			AUTOFS_CONF_DIR "/autofs"
 #define MAX_LINE_LEN			256
 #define MAX_SECTION_NAME		MAX_LINE_LEN
+#define MAX_CFG_NAME_LEN		31
 
 #define NAME_MASTER_MAP			"master_map_name"
 
@@ -661,7 +662,7 @@ static int conf_update(const char *section,
 	ret = CFG_FAIL;
 	co = conf_lookup(section, key);
 	if (!co)
-		ret = conf_add(section, key, value, flags);
+		return conf_add(section, key, value, flags);
 	else {
 		char *val = NULL, *tmp = NULL;
 		/* Environment overrides file value */
@@ -691,15 +692,29 @@ error:
 	return ret;
 }
 
+static u_int32_t get_hash(const char *key, unsigned int size)
+{
+	const char *pkey = key;
+	char lkey[MAX_CFG_NAME_LEN];
+	char *plkey = &lkey[0];
+
+	while (*pkey)
+		*plkey++ = tolower(*pkey++);
+	*plkey = '\0';
+	return hash(lkey, size);
+}
+
 static struct conf_option *conf_lookup(const char *section, const char *key)
 {
 	struct conf_option *co;
+	u_int32_t key_hash;
 	unsigned int size = CFG_TABLE_SIZE;
 
 	if (!key || !section)
 		return NULL;
 
-	for (co = config->hash[hash(key, size)]; co != NULL; co = co->next) {
+	key_hash = get_hash(key, size);
+	for (co = config->hash[key_hash]; co != NULL; co = co->next) {
 		if (strcasecmp(section, co->section))
 			continue;
 		if (!strcasecmp(key, co->name))
@@ -772,7 +787,7 @@ static int parse_line(char *line, char **sec, char **res, char **value)
 	if (*key == '#' || (*key != '[' && !isalpha(*key)))
 		return 0;
 
-	while (*key && *key == ' ')
+	while (*key && isblank(*key))
 		key++;
 
 	if (!*key)
@@ -780,13 +795,13 @@ static int parse_line(char *line, char **sec, char **res, char **value)
 
 	if (*key == '[') {
 		char *tmp;
-		while (*key && (*key == '[' || *key == ' '))
+		while (*key && (*key == '[' || isblank(*key)))
 			key++;
 		tmp = strchr(key, ']');
 		if (!tmp)
 			return 0;
 		*tmp = ' ';
-		while (*tmp && *tmp == ' ') {
+		while (*tmp && isblank(*tmp)) {
 			*tmp = '\0';
 			tmp--;
 		}
@@ -803,7 +818,7 @@ static int parse_line(char *line, char **sec, char **res, char **value)
 
 	*val++ = '\0';
 
-	while (*(--tmp) == ' ')
+	while (isblank(*(--tmp)))
 		*tmp = '\0';
 
 	while (*val && (*val == '"' || isblank(*val)))