From: erickson <erickson@9efc2488-bf62-4759-914b-345cdb29e865>
Date: Sun, 19 Jun 2005 18:00:10 +0000 (+0000)
Subject: took the config functions from generic_utils and put them here
X-Git-Url: https://old-git.evergreen-ils.org/?a=commitdiff_plain;h=3bab253c08a9e445b73c20b9a117c4a089d03380;p=opensrf%2Fbjwebb.git

took the config functions from generic_utils and put them here


git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@363 9efc2488-bf62-4759-914b-345cdb29e865
---

diff --git a/src/libstack/osrf_config.c b/src/libstack/osrf_config.c
new file mode 100644
index 0000000..a4953b1
--- /dev/null
+++ b/src/libstack/osrf_config.c
@@ -0,0 +1,156 @@
+#include "osrf_config.h"
+
+//object* config_object = NULL;
+
+/*
+char* osrf_config_value(char* path) {
+}
+
+
+void _osrf_config_grab_config() {
+	if(config_object) return;
+}
+*/
+
+
+void config_reader_init( char* name, char* config_file ) {
+
+	if( name == NULL || config_file == NULL || strlen(config_file) == 0 ) {
+		fatal_handler( "config_reader_init(): No config file specified" );
+		return;
+	}
+
+	config_reader* reader = 
+		(config_reader*) safe_malloc(sizeof(config_reader));
+
+	reader->config_doc = xmlParseFile( config_file ); 
+	reader->xpathCx = xmlXPathNewContext( reader->config_doc );
+	reader->name = strdup(name);
+	reader->next = NULL;
+
+	if( reader->xpathCx == NULL ) {
+		fprintf( stderr, "config_reader_init(): Unable to create xpath context\n");
+		return;
+	}
+
+	if( conf_reader == NULL ) {
+		conf_reader = reader;
+	} else {
+		config_reader* tmp = conf_reader;
+		conf_reader = reader;
+		reader->next = tmp;
+	}
+}
+
+
+char* config_value( const char* config_name, const char* xp_query, ... ) {
+
+	if( conf_reader == NULL || xp_query == NULL ) {
+		fatal_handler( "config_value(): NULL conf_reader or NULL param(s)" );
+		return NULL;
+	}
+
+	config_reader* reader = conf_reader;
+	while( reader != NULL ) {
+		if( !strcmp(reader->name, config_name)) 
+			break;
+		reader = reader->next;
+	}
+
+	if( reader == NULL ) {
+		fprintf(stderr, "No Config file with name %s\n", config_name );
+		return NULL;
+	}
+
+	int slen = strlen(xp_query) + 512;/* this is unsafe ... */
+	char xpath_query[ slen ]; 
+	memset( xpath_query, 0, slen );
+	va_list va_args;
+	va_start(va_args, xp_query);
+	vsprintf(xpath_query, xp_query, va_args);
+	va_end(va_args);
+
+
+	char* val;
+	int len = strlen(xpath_query) + 100;
+	char alert_buffer[len];
+	memset( alert_buffer, 0, len );
+
+	// build the xpath object
+	xmlXPathObjectPtr xpathObj = xmlXPathEvalExpression( BAD_CAST xpath_query, reader->xpathCx );
+
+	if( xpathObj == NULL ) {
+		sprintf( alert_buffer, "Could not build xpath object: %s", xpath_query );
+		fatal_handler( alert_buffer );
+		return NULL;
+	}
+
+
+	if( xpathObj->type == XPATH_NODESET ) {
+
+		// ----------------------------------------------------------------------------
+		// Grab nodeset from xpath query, then first node, then first text node and 
+		// finaly the text node's value
+		// ----------------------------------------------------------------------------
+		xmlNodeSet* node_list = xpathObj->nodesetval;
+		if( node_list == NULL ) {
+			sprintf( alert_buffer, "Could not build xpath object: %s", xpath_query );
+			warning_handler(alert_buffer);
+			return NULL;
+		}
+
+		if( node_list->nodeNr == 0 ) {
+			sprintf( alert_buffer, "Config XPATH query  returned 0 results: %s", xpath_query );
+			warning_handler(alert_buffer);
+			return NULL;
+		}
+
+
+		xmlNodePtr element_node = *(node_list)->nodeTab;
+		if( element_node == NULL ) {
+			sprintf( alert_buffer, "Config XPATH query  returned 0 results: %s", xpath_query );
+			warning_handler(alert_buffer);
+			return NULL;
+		}
+
+		xmlNodePtr text_node = element_node->children;
+		if( text_node == NULL ) {
+			sprintf( alert_buffer, "Config variable has no value: %s", xpath_query );
+			warning_handler(alert_buffer);
+			return NULL;
+		}
+
+		val = text_node->content;
+		if( val == NULL ) {
+			sprintf( alert_buffer, "Config variable has no value: %s", xpath_query );
+			warning_handler(alert_buffer);
+			return NULL;
+		}
+
+
+	} else { 
+		sprintf( alert_buffer, "Xpath evaluation failed: %s", xpath_query );
+		warning_handler(alert_buffer);
+		return NULL;
+	}
+
+	char* value = strdup(val);
+	if( value == NULL ) { warning_handler( "config_value(): Empty config value or Out of Memory!" ); }
+
+	// Free XPATH structures
+	if( xpathObj != NULL ) xmlXPathFreeObject( xpathObj );
+
+	return value;
+}
+
+
+void config_reader_free() {
+	while( conf_reader != NULL ) {
+		xmlXPathFreeContext( conf_reader->xpathCx );
+		xmlFreeDoc( conf_reader->config_doc );
+		free(conf_reader->name );
+		config_reader* tmp = conf_reader->next;
+		free( conf_reader );
+		conf_reader = tmp;
+	}
+}
diff --git a/src/libstack/osrf_config.o b/src/libstack/osrf_config.o
new file mode 100644
index 0000000..67622aa
Binary files /dev/null and b/src/libstack/osrf_config.o differ