On 8/31/21 11:04 PM, renlei1998@163.com wrote:
From: Ren Lei <ren.lei4@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@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);