2 files changed, 13 insertions, 11 deletions

diff --git a/include/xas/vox.h b/include/xas/vox.h
index 917eda1..641fe3a 100644
--- a/include/xas/vox.h
+++ b/include/xas/vox.h
@@ -7,20 +7,22 @@
 
 #include <xas/audio.h>
 
-#define XAS_VOX_IDLE    0
-#define XAS_VOX_ACTIVE (1 << 0)
 
 typedef struct _xas_vox {
+enum xas_vox_state {
+    XAS_VOX_IDLE,
+    XAS_VOX_ACTIVE
+};
 
     xas_audio_format format;
 
     size_t buffer_size;
 
-    int flags;
     const char *text2wave_path;
     int argn;
     char **args;
 
+    enum xas_vox_state state;
 
     int pid,
         stdin,
diff --git a/src/vox.c b/src/vox.c
index 697ff95..caa3a26 100644
--- a/src/vox.c
+++ b/src/vox.c
@@ -38,7 +38,7 @@ static int vox_stop(xas_vox *vox) {
         vox->pid = -1;
     }
 
-    vox->flags &= ~XAS_VOX_ACTIVE;
+    vox->state = XAS_VOX_IDLE;
 
     return 0;
 
@@ -83,7 +83,7 @@ static int vox_start(xas_vox *vox) {
 
     char sample_rate[40];
 
-    if (vox->flags & XAS_VOX_ACTIVE) {
+    if (vox->state == XAS_VOX_ACTIVE) {
         (void)vox_stop(vox);
     }
 
@@ -155,7 +155,7 @@ error_child:
     vox->stdin  = pipe_stdin[1];
     vox->stdout = pipe_stdout[0];
     vox->in     = fdopen(pipe_stdin[1], "w");
-    vox->flags |= XAS_VOX_ACTIVE;
+    vox->state  = XAS_VOX_ACTIVE;
 
     return 0;
 
@@ -182,7 +182,7 @@ static ssize_t vox_fill(xas_vox *vox,
     ssize_t readlen,
             readcount;
 
-    if (!(vox->flags & XAS_VOX_ACTIVE)) {
+    if (vox->state != XAS_VOX_ACTIVE) {
         xas_audio_zero(vox->format, samples, 0, count);
 
         return count;
@@ -224,7 +224,7 @@ xas_vox *xas_vox_new(const char *text2wave_path,
     vox->format.sample_rate = format.sample_rate;
 
     vox->buffer_size = buffer_size;
-    vox->flags       = XAS_VOX_IDLE;
+    vox->state       = XAS_VOX_IDLE;
     vox->pid         = -1;
     vox->stdin       = -1;
     vox->stdout      = -1;
@@ -246,7 +246,7 @@ void xas_vox_destroy(xas_vox *vox) {
 }
 
 int xas_vox_stop(xas_vox *vox) {
-    if (vox->flags & XAS_VOX_ACTIVE) {
+    if (vox->state == XAS_VOX_ACTIVE) {
         return vox_stop(vox);
     }
 
@@ -254,7 +254,7 @@ int xas_vox_stop(xas_vox *vox) {
 }
 
 int xas_vox_active(xas_vox *vox) {
-    return vox->flags & XAS_VOX_ACTIVE;
+    return vox->state == XAS_VOX_ACTIVE;
 }
 
 int xas_vox_generate(xas_vox *vox) {
@@ -288,7 +288,7 @@ error_riff_open_fd:
 }
 
 int xas_vox_vsayf(xas_vox *vox, const char *format, va_list args) {
-    if (!(vox->flags & XAS_VOX_ACTIVE) && vox_start(vox) < 0) {
+    if (vox->state == XAS_VOX_IDLE && vox_start(vox) < 0) {
         goto error_vox_start;
     }