[PATCH V7 11/29] qapi: list utility functions

[Steve Sistare]

Generalize strList_from_comma_list() to take any delimiter character, rename
as strList_from_string(), and move it to qapi/util.c.  Also add
strv_from_strList() and QAPI_LIST_LENGTH().

No functional change.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
---
 include/qapi/util.h | 28 ++++++++++++++++++++++++++++
 monitor/hmp-cmds.c  | 29 ++---------------------------
 qapi/qapi-util.c    | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 67 insertions(+), 27 deletions(-)

diff --git a/include/qapi/util.h b/include/qapi/util.h
index 81a2b13..c249108 100644
--- a/include/qapi/util.h
+++ b/include/qapi/util.h
@@ -22,6 +22,8 @@ typedef struct QEnumLookup {
     const int size;
 } QEnumLookup;
 
+struct strList;
+
 const char *qapi_enum_lookup(const QEnumLookup *lookup, int val);
 int qapi_enum_parse(const QEnumLookup *lookup, const char *buf,
                     int def, Error **errp);
@@ -31,6 +33,19 @@ bool qapi_bool_parse(const char *name, const char *value, 
bool *obj,
 int parse_qapi_name(const char *name, bool complete);
 
 /*
+ * Produce and return a NULL-terminated array of strings from @args.
+ * All strings are g_strdup'd.
+ */
+char **strv_from_strList(const struct strList *args);
+
+/*
+ * Produce a strList from the character delimited string @in.
+ * All strings are g_strdup'd.
+ * A NULL or empty input string returns NULL.
+ */
+struct strList *strList_from_string(const char *in, char delim);
+
+/*
  * For any GenericList @list, insert @element at the front.
  *
  * Note that this macro evaluates @element exactly once, so it is safe
@@ -56,4 +71,17 @@ int parse_qapi_name(const char *name, bool complete);
     (tail) = &(*(tail))->next; \
 } while (0)
 
+/*
+ * For any GenericList @list, return its length.
+ */
+#define QAPI_LIST_LENGTH(list) \
+    ({ \
+        int len = 0; \
+        typeof(list) elem; \
+        for (elem = list; elem != NULL; elem = elem->next) { \
+            len++; \
+        } \
+        len; \
+    })
+
 #endif
diff --git a/monitor/hmp-cmds.c b/monitor/hmp-cmds.c
index b8c22da..5ca8b4b 100644
--- a/monitor/hmp-cmds.c
+++ b/monitor/hmp-cmds.c
@@ -43,6 +43,7 @@
 #include "qapi/qapi-commands-run-state.h"
 #include "qapi/qapi-commands-tpm.h"
 #include "qapi/qapi-commands-ui.h"
+#include "qapi/util.h"
 #include "qapi/qapi-visit-net.h"
 #include "qapi/qapi-visit-migration.h"
 #include "qapi/qmp/qdict.h"
@@ -70,32 +71,6 @@ bool hmp_handle_error(Monitor *mon, Error *err)
     return false;
 }
 
-/*
- * Produce a strList from a comma separated list.
- * A NULL or empty input string return NULL.
- */
-static strList *strList_from_comma_list(const char *in)
-{
-    strList *res = NULL;
-    strList **tail = &res;
-
-    while (in && in[0]) {
-        char *comma = strchr(in, ',');
-        char *value;
-
-        if (comma) {
-            value = g_strndup(in, comma - in);
-            in = comma + 1; /* skip the , */
-        } else {
-            value = g_strdup(in);
-            in = NULL;
-        }
-        QAPI_LIST_APPEND(tail, value);
-    }
-
-    return res;
-}
-
 void hmp_info_name(Monitor *mon, const QDict *qdict)
 {
     NameInfo *info;
@@ -1103,7 +1078,7 @@ void hmp_announce_self(Monitor *mon, const QDict *qdict)
                                             migrate_announce_params());
 
     qapi_free_strList(params->interfaces);
-    params->interfaces = strList_from_comma_list(interfaces_str);
+    params->interfaces = strList_from_string(interfaces_str, ',');
     params->has_interfaces = params->interfaces != NULL;
     params->id = g_strdup(id);
     params->has_id = !!params->id;
diff --git a/qapi/qapi-util.c b/qapi/qapi-util.c
index fda7044..edd51b3 100644
--- a/qapi/qapi-util.c
+++ b/qapi/qapi-util.c
@@ -15,6 +15,7 @@
 #include "qapi/error.h"
 #include "qemu/ctype.h"
 #include "qapi/qmp/qerror.h"
+#include "qapi/qapi-builtin-types.h"
 
 CompatPolicy compat_policy;
 
@@ -152,3 +153,39 @@ int parse_qapi_name(const char *str, bool complete)
     }
     return p - str;
 }
+
+char **strv_from_strList(const strList *args)
+{
+    const strList *arg;
+    int i = 0;
+    char **argv = g_malloc((QAPI_LIST_LENGTH(args) + 1) * sizeof(char *));
+
+    for (arg = args; arg != NULL; arg = arg->next) {
+        argv[i++] = g_strdup(arg->value);
+    }
+    argv[i] = NULL;
+
+    return argv;
+}
+
+strList *strList_from_string(const char *in, char delim)
+{
+    strList *res = NULL;
+    strList **tail = &res;
+
+    while (in && in[0]) {
+        char *next = strchr(in, delim);
+        char *value;
+
+        if (next) {
+            value = g_strndup(in, next - in);
+            in = next + 1; /* skip the delim */
+        } else {
+            value = g_strdup(in);
+            in = NULL;
+        }
+        QAPI_LIST_APPEND(tail, value);
+    }
+
+    return res;
+}
-- 
1.8.3.1