Re: [PATCH 02/20] monitor: Use GString instead of QString for output buffer

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Markus Armbruster (armbru@redhat.com) wrote:
> GString has a richer set of string operations than QString.  It should
> be preferred to QString except where we need a QObject or reference
> counting.  We don't here.  Switch to GString, and put its richer
> interface to use.
> 
> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  monitor/monitor-internal.h |  2 +-
>  monitor/misc.c             |  2 +-
>  monitor/monitor.c          | 20 ++++++++------------
>  3 files changed, 10 insertions(+), 14 deletions(-)
> 
> diff --git a/monitor/monitor-internal.h b/monitor/monitor-internal.h
> index a6131554da..40903d6386 100644
> --- a/monitor/monitor-internal.h
> +++ b/monitor/monitor-internal.h
> @@ -105,7 +105,7 @@ struct Monitor {
>       * Members that are protected by the per-monitor lock
>       */
>      QLIST_HEAD(, mon_fd_t) fds;
> -    QString *outbuf;
> +    GString *outbuf;
>      guint out_watch;
>      /* Read under either BQL or mon_lock, written with BQL+mon_lock.  */
>      int mux_out;
> diff --git a/monitor/misc.c b/monitor/misc.c
> index 6c3e8506a9..814d22de11 100644
> --- a/monitor/misc.c
> +++ b/monitor/misc.c
> @@ -136,7 +136,7 @@ char *qmp_human_monitor_command(const char *command_line, bool has_cpu_index,
>      handle_hmp_command(&hmp, command_line);
>  
>      WITH_QEMU_LOCK_GUARD(&hmp.common.mon_lock) {
> -        output = g_strdup(qstring_get_str(hmp.common.outbuf));
> +        output = g_strdup(hmp.common.outbuf->str);
>      }
>  
>  out:
> diff --git a/monitor/monitor.c b/monitor/monitor.c
> index 84222cd130..1e4a6b3f20 100644
> --- a/monitor/monitor.c
> +++ b/monitor/monitor.c
> @@ -29,7 +29,6 @@
>  #include "qapi/qapi-emit-events.h"
>  #include "qapi/qapi-visit-control.h"
>  #include "qapi/qmp/qdict.h"
> -#include "qapi/qmp/qstring.h"
>  #include "qemu/error-report.h"
>  #include "qemu/option.h"
>  #include "sysemu/qtest.h"
> @@ -181,22 +180,19 @@ static void monitor_flush_locked(Monitor *mon)
>          return;
>      }
>  
> -    buf = qstring_get_str(mon->outbuf);
> -    len = qstring_get_length(mon->outbuf);
> +    buf = mon->outbuf->str;
> +    len = mon->outbuf->len;
>  
>      if (len && !mon->mux_out) {
>          rc = qemu_chr_fe_write(&mon->chr, (const uint8_t *) buf, len);
>          if ((rc < 0 && errno != EAGAIN) || (rc == len)) {
>              /* all flushed or error */
> -            qobject_unref(mon->outbuf);
> -            mon->outbuf = qstring_new();
> +            g_string_truncate(mon->outbuf, 0);
>              return;
>          }
>          if (rc > 0) {
>              /* partial write */
> -            QString *tmp = qstring_from_str(buf + rc);
> -            qobject_unref(mon->outbuf);
> -            mon->outbuf = tmp;
> +            g_string_erase(mon->outbuf, 0, rc);
>          }
>          if (mon->out_watch == 0) {
>              mon->out_watch =
> @@ -223,9 +219,9 @@ int monitor_puts(Monitor *mon, const char *str)
>      for (i = 0; str[i]; i++) {
>          c = str[i];
>          if (c == '\n') {
> -            qstring_append_chr(mon->outbuf, '\r');
> +            g_string_append_c(mon->outbuf, '\r');
>          }
> -        qstring_append_chr(mon->outbuf, c);
> +        g_string_append_c(mon->outbuf, c);
>          if (c == '\n') {
>              monitor_flush_locked(mon);
>          }
> @@ -602,7 +598,7 @@ void monitor_data_init(Monitor *mon, bool is_qmp, bool skip_flush,
>      }
>      qemu_mutex_init(&mon->mon_lock);
>      mon->is_qmp = is_qmp;
> -    mon->outbuf = qstring_new();
> +    mon->outbuf = g_string_new(NULL);
>      mon->skip_flush = skip_flush;
>      mon->use_io_thread = use_io_thread;
>  }
> @@ -616,7 +612,7 @@ void monitor_data_destroy(Monitor *mon)
>      } else {
>          readline_free(container_of(mon, MonitorHMP, common)->rs);
>      }
> -    qobject_unref(mon->outbuf);
> +    g_string_free(mon->outbuf, true);
>      qemu_mutex_destroy(&mon->mon_lock);
>  }
>  
> -- 
> 2.26.2
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK