[RFC V3 1/5] option: introduce qemu_get_opt_all()

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Sometimes, we need to pass option like -netdev tap,fd=100,fd=101,fd=102 which
can not be properly parsed by qemu_find_opt() because it only returns the first
matched option. So qemu_get_opt_all() were introduced to return an array of
pointers which contains all matched option.

Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
 qemu-option.c |   19 +++++++++++++++++++
 qemu-option.h |    2 ++
 2 files changed, 21 insertions(+), 0 deletions(-)

diff --git a/qemu-option.c b/qemu-option.c
index bb3886c..9263125 100644
--- a/qemu-option.c
+++ b/qemu-option.c
@@ -545,6 +545,25 @@ static QemuOpt *qemu_opt_find(QemuOpts *opts, const char *name)
     return NULL;
 }
 
+int qemu_opt_get_all(QemuOpts *opts, const char *name, const char **optp,
+                     int max)
+{
+    QemuOpt *opt;
+    int index = 0;
+
+    QTAILQ_FOREACH_REVERSE(opt, &opts->head, QemuOptHead, next) {
+        if (strcmp(opt->name, name) == 0) {
+            if (index < max) {
+                optp[index++] = opt->str;
+            }
+            if (index == max) {
+                break;
+            }
+        }
+    }
+    return index;
+}
+
 const char *qemu_opt_get(QemuOpts *opts, const char *name)
 {
     QemuOpt *opt = qemu_opt_find(opts, name);
diff --git a/qemu-option.h b/qemu-option.h
index 951dec3..3c9a273 100644
--- a/qemu-option.h
+++ b/qemu-option.h
@@ -106,6 +106,8 @@ struct QemuOptsList {
     QemuOptDesc desc[];
 };
 
+int qemu_opt_get_all(QemuOpts *opts, const char *name, const char **optp,
+                     int max);
 const char *qemu_opt_get(QemuOpts *opts, const char *name);
 bool qemu_opt_get_bool(QemuOpts *opts, const char *name, bool defval);
 uint64_t qemu_opt_get_number(QemuOpts *opts, const char *name, uint64_t defval);
-- 
1.7.1

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