On 8/31/21 11:04 PM, renlei1998(a)163.com wrote:
From: Ren Lei <ren.lei4(a)zte.com.cn>
the length of LINE_ENDING is static, it's a waste to call
strlen every time.
AFAIK gcc optimizes out calls to strlen of a literal constant string,
making this hand-optimization unnecessary.
Signed-off-by: Ren Lei <ren.lei4(a)zte.com.cn>
---
src/qemu/qemu_agent.c | 5 +++--
src/qemu/qemu_monitor_json.c | 3 ++-
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/src/qemu/qemu_agent.c b/src/qemu/qemu_agent.c
index 5f421be6f6..3a453b4c58 100644
--- a/src/qemu/qemu_agent.c
+++ b/src/qemu/qemu_agent.c
@@ -47,6 +47,7 @@
VIR_LOG_INIT("qemu.qemu_agent");
#define LINE_ENDING "\n"
+#define LINE_ENDING_LENGTH 1
#define DEBUG_IO 0
#define DEBUG_RAW_IO 0
@@ -341,11 +342,11 @@ static int qemuAgentIOProcessData(qemuAgent *agent,
if (nl) {
int got = nl - (data + used);
- for (i = 0; i < strlen(LINE_ENDING); i++)
+ for (i = 0; i < LINE_ENDING_LENGTH; i++)
data[used + got + i] = '\0';
if (qemuAgentIOProcessLine(agent, data + used, msg) < 0)
return -1;
- used += got + strlen(LINE_ENDING);
+ used += got + LINE_ENDING_LENGTH;
} else {
break;
}
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 8d3c4031a6..8b77b3cdaa 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -51,6 +51,7 @@ VIR_LOG_INIT("qemu.qemu_monitor_json");
#define QOM_CPU_PATH "/machine/unattached/device[0]"
#define LINE_ENDING "\r\n"
+#define LINE_ENDING_LENGTH 2
VIR_ENUM_IMPL(qemuMonitorJob,
QEMU_MONITOR_JOB_TYPE_LAST,
@@ -271,7 +272,7 @@ int qemuMonitorJSONIOProcess(qemuMonitor *mon,
int got = nl - (data + used);
char *line;
line = g_strndup(data + used, got);
- used += got + strlen(LINE_ENDING);
+ used += got + LINE_ENDING_LENGTH;
line[got] = '\0'; /* kill \n */
if (qemuMonitorJSONIOProcessLine(mon, line, msg) < 0) {
VIR_FREE(line);