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[Qemu-devel] [PATCH for-2.10 1/5] QemuOpts: introduce qemu_opts_extract(
From: |
Peter Xu |
Subject: |
[Qemu-devel] [PATCH for-2.10 1/5] QemuOpts: introduce qemu_opts_extract() |
Date: |
Fri, 31 Mar 2017 15:36:29 +0800 |
This helper function is used to extract specific QemuOpts item from an
existing QemuOptsList which matches specific patterns.
Signed-off-by: Peter Xu <address@hidden>
---
include/qemu/option.h | 2 ++
util/qemu-option.c | 24 ++++++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/include/qemu/option.h b/include/qemu/option.h
index f7338db..355cee8 100644
--- a/include/qemu/option.h
+++ b/include/qemu/option.h
@@ -136,6 +136,8 @@ void qemu_opts_absorb_qdict(QemuOpts *opts, QDict *qdict,
Error **errp);
typedef int (*qemu_opts_loopfunc)(void *opaque, QemuOpts *opts, Error **errp);
int qemu_opts_foreach(QemuOptsList *list, qemu_opts_loopfunc func,
void *opaque, Error **errp);
+QemuOpts *qemu_opts_extract(QemuOptsList *list, qemu_opts_loopfunc func,
+ void *opaque, Error **errp);
void qemu_opts_print(QemuOpts *opts, const char *sep);
void qemu_opts_print_help(QemuOptsList *list);
void qemu_opts_free(QemuOptsList *list);
diff --git a/util/qemu-option.c b/util/qemu-option.c
index 5ce1b5c..7c34d88 100644
--- a/util/qemu-option.c
+++ b/util/qemu-option.c
@@ -1121,6 +1121,30 @@ int qemu_opts_foreach(QemuOptsList *list,
qemu_opts_loopfunc func,
return rc;
}
+/*
+ * Extract specific QemuOpts from a QemuOptsList. For each QemuOpts
+ * item, if checks against func() returns zero, it'll be picked out
+ * from current QemuOptsList, then returned. If there are more than
+ * one QemuOpts that match the check, will only return the first one
+ * found.
+ */
+QemuOpts *qemu_opts_extract(QemuOptsList *list, qemu_opts_loopfunc func,
+ void *opaque, Error **errp)
+{
+ QemuOpts *opts, *next_opts;
+
+ assert(list && func);
+
+ QTAILQ_FOREACH_SAFE(opts, &list->head, next, next_opts) {
+ if (func(opaque, opts, errp) == 0) {
+ QTAILQ_REMOVE(&list->head, opts, next);
+ return opts;
+ }
+ }
+
+ return NULL;
+}
+
static size_t count_opts_list(QemuOptsList *list)
{
QemuOptDesc *desc = NULL;
--
2.7.4
- [Qemu-devel] [PATCH for-2.10 0/5] x86/vIOMMU: move init back to machine init phase, Peter Xu, 2017/03/31
- [Qemu-devel] [PATCH for-2.10 1/5] QemuOpts: introduce qemu_opts_extract(),
Peter Xu <=
- [Qemu-devel] [PATCH for-2.10 2/5] util: export device_init_func(), Peter Xu, 2017/03/31
- [Qemu-devel] [PATCH for-2.10 3/5] util: propagate error for device_func_init(), Peter Xu, 2017/03/31
- [Qemu-devel] [PATCH for-2.10 4/5] q35: init vIOMMU during machine init, Peter Xu, 2017/03/31
- [Qemu-devel] [PATCH for-2.10 5/5] pci: move dma_as init back to bus realize, Peter Xu, 2017/03/31
- Re: [Qemu-devel] [PATCH for-2.10 0/5] x86/vIOMMU: move init back to machine init phase, Michael S. Tsirkin, 2017/03/31