[PATCH 10/12] Introduce qemuBuildInputDevStr

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A function that builds the -device string for input devices.
---
 src/qemu/qemu_command.c | 42 +++++++++++++++++++++++++++++-------------
 src/qemu/qemu_command.h |  7 +++++++
 2 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 138bbdf1a..7bdff85fc 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4303,6 +4303,27 @@ qemuBuildUSBInputDevStr(const virDomainDef *def,
 }
 
 
+int
+qemuBuildInputDevStr(char **devstr,
+                     const virDomainDef *def,
+                     virDomainInputDefPtr input,
+                     virQEMUCapsPtr qemuCaps)
+{
+    switch (input->bus) {
+    case VIR_DOMAIN_INPUT_BUS_USB:
+        if (!(*devstr = qemuBuildUSBInputDevStr(def, input, qemuCaps)))
+            return -1;
+        break;
+
+    case VIR_DOMAIN_INPUT_BUS_VIRTIO:
+        if (!(*devstr = qemuBuildVirtioInputDevStr(def, input, qemuCaps)))
+            return -1;
+        break;
+    }
+    return 0;
+}
+
+
 static int
 qemuBuildInputCommandLine(virCommandPtr cmd,
                           const virDomainDef *def,
@@ -4312,22 +4333,17 @@ qemuBuildInputCommandLine(virCommandPtr cmd,
 
     for (i = 0; i < def->ninputs; i++) {
         virDomainInputDefPtr input = def->inputs[i];
+        char *devstr = NULL;
 
-        if (input->bus == VIR_DOMAIN_INPUT_BUS_USB) {
-            char *optstr;
-            virCommandAddArg(cmd, "-device");
-            if (!(optstr = qemuBuildUSBInputDevStr(def, input, qemuCaps)))
-                return -1;
-            virCommandAddArg(cmd, optstr);
-            VIR_FREE(optstr);
-        } else if (input->bus == VIR_DOMAIN_INPUT_BUS_VIRTIO) {
-            char *optstr;
+        if (qemuBuildInputDevStr(&devstr, def, input, qemuCaps) < 0)
+            return -1;
+
+        if (devstr) {
             virCommandAddArg(cmd, "-device");
-            if (!(optstr = qemuBuildVirtioInputDevStr(def, input, qemuCaps)))
-                return -1;
-            virCommandAddArg(cmd, optstr);
-            VIR_FREE(optstr);
+            virCommandAddArg(cmd, devstr);
         }
+
+        VIR_FREE(devstr);
     }
 
     return 0;
diff --git a/src/qemu/qemu_command.h b/src/qemu/qemu_command.h
index 1254ad4df..0961ec8cb 100644
--- a/src/qemu/qemu_command.h
+++ b/src/qemu/qemu_command.h
@@ -204,4 +204,11 @@ char *qemuBuildWatchdogDevStr(const virDomainDef *def,
                               virDomainWatchdogDefPtr dev,
                               virQEMUCapsPtr qemuCaps);
 
+int qemuBuildInputDevStr(char **devstr,
+                         const virDomainDef *def,
+                         virDomainInputDefPtr input,
+                         virQEMUCapsPtr qemuCaps)
+    ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3)
+    ATTRIBUTE_NONNULL(4);
+
 #endif /* __QEMU_COMMAND_H__*/
-- 
2.13.0

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