[Patch 1/4] Xen inactive domains: config file APIs

["Daniel P. Berrange" <berrange@xxxxxxxxxx>]

This patch adds an extra API to the config file management API. This API lets
you add a new config parameter to the file. Previously you could only modify
existing values, not define extra ones. It also exposes an API for creating
a new empty config file record, which is needed if you're creating a brand
new config file, rathre than processing an existing one.

Dan.
-- 
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Index: src/conf.c
===================================================================
RCS file: /data/cvs/libvirt/src/conf.c,v
retrieving revision 1.3
diff -u -r1.3 conf.c
--- src/conf.c	3 Sep 2006 17:46:32 -0000	1.3
+++ src/conf.c	4 Sep 2006 01:15:07 -0000
@@ -144,16 +144,7 @@
     free(val);
 }
 
-/**
- * virConfCreate:
- * @filename: the name to report errors
- *
- * Create a configuration internal structure
- *
- * Returns a pointer or NULL in case of error.
- */
-static virConfPtr
-virConfCreate(const char *filename)
+virConfPtr virConfNew(void)
 {
     virConfPtr ret;
 
@@ -164,12 +155,29 @@
     }
     memset(ret, 0, sizeof(virConf));
 
-    ret->filename = filename;
+    ret->filename = NULL;
 
     return(ret);
 }
 
 /**
+ * virConfCreate:
+ * @filename: the name to report errors
+ *
+ * Create a configuration internal structure
+ *
+ * Returns a pointer or NULL in case of error.
+ */
+static virConfPtr
+virConfCreate(const char *filename)
+{
+    virConfPtr ret = virConfNew();
+    if (ret)
+        ret->filename = filename;
+    return(ret);
+}
+
+/**
  * virConfAddEntry:
  * @conf: the conf structure
  * @name: name of the entry or NULL for comment
@@ -785,6 +793,56 @@
 }
 
 /**
+ * virConfGetValue:
+ * @conf: a configuration file handle
+ * @entry: the name of the entry
+ * @value: the new configuration value
+ *
+ * Set (or replace) the value associated to this entry in the configuration
+ * file.
+ *
+ * Returns 0 on success, or -1 on failure. Upon success, the passed in
+ * value will be owned by the conf object & should not be freed. 
+ */
+int             virConfSetValue         (virConfPtr conf,
+					 const char *setting,
+					 virConfValuePtr value) {
+    virConfEntryPtr cur, prev = NULL;
+
+    cur = conf->entries;
+    while (cur != NULL) {
+        if ((cur->name != NULL) && (!strcmp(cur->name, setting))) {
+            break;
+	}
+	prev = cur;
+        cur = cur->next;
+    }
+    if (!cur) {
+        if (!(cur = malloc(sizeof(virConfEntry))))
+            return (-1);
+        cur->next = NULL;
+        cur->comment = NULL;
+        if (!(cur->name = strdup(setting))) {
+            free(cur);
+            return (-1);
+        }
+	cur->value = value;
+        if (prev) {
+            prev->next = cur;
+        } else {
+            conf->entries = cur;
+        }
+    } else {
+        if (cur->value) {
+            virConfFreeValue(cur->value);
+        }
+	cur->value = value;
+    }
+    return (0);
+}
+
+
+/**
  * virConfWriteFile:
  * @filename: the path to the configuration file.
  * @conf: the conf
Index: src/conf.h
===================================================================
RCS file: /data/cvs/libvirt/src/conf.h,v
retrieving revision 1.1
diff -u -r1.1 conf.h
--- src/conf.h	29 Aug 2006 22:27:07 -0000	1.1
+++ src/conf.h	4 Sep 2006 01:15:07 -0000
@@ -50,6 +50,7 @@
 typedef struct _virConf virConf;
 typedef virConf *virConfPtr;
 
+virConfPtr      virConfNew              (void);
 virConfPtr	virConfReadFile		(const char *filename);
 virConfPtr	virConfReadMem		(const char *memory,
 					 int len);
@@ -57,6 +58,9 @@
 
 virConfValuePtr	virConfGetValue		(virConfPtr conf,
 					 const char *setting);
+int             virConfSetValue         (virConfPtr conf,
+					 const char *setting,
+					 virConfValuePtr value);
 int		virConfWriteFile	(const char *filename,
 					 virConfPtr conf);
 int		virConfWriteMem		(char *memory,