all: remove FIXME and TODO comments

We can always improve. These comments tend to linger and go misleading
or plain wrong over time.

Closes #16283

lib/vquic/curl_msh3.c

@@ -441,10 +441,10 @@ static bool MSH3_CALL msh3_data_received(MSH3_REQUEST *Request,
   CURLcode result;
   bool rv = FALSE;
 
-  /* TODO: we would like to limit the amount of data we are buffer here.
-   * There seems to be no mechanism in msh3 to adjust flow control and
-   * it is undocumented what happens if we return FALSE here or less
-   * length (buflen is an inout parameter).
+  /* We would like to limit the amount of data we are buffer here. There seems
+   * to be no mechanism in msh3 to adjust flow control and it is undocumented
+   * what happens if we return FALSE here or less length (buflen is an inout
+   * parameter).
    */
   (void)Request;
   if(!stream)
@@ -703,8 +703,8 @@ static ssize_t cf_msh3_send(struct Curl_cfilter *cf, struct Curl_easy *data,
       goto out;
     }
 
-    /* TODO - msh3/msquic will hold onto this memory until the send complete
-       event. How do we make sure curl does not free it until then? */
+    /* msh3/msquic will hold onto this memory until the send complete event.
+       How do we make sure curl does not free it until then? */
     *err = CURLE_OK;
     nwritten = len;
   }
@@ -838,7 +838,7 @@ static CURLcode cf_connect_start(struct Curl_cfilter *cf,
   MSH3_SET_PORT(&addr, (uint16_t)cf->conn->remote_port);
 
   if(verify && (conn_config->CAfile || conn_config->CApath)) {
-    /* TODO: need a way to provide trust anchors to MSH3 */
+    /* Need a way to provide trust anchors to MSH3 */
 #ifdef DEBUGBUILD
     /* we need this for our test cases to run */
     CURL_TRC_CF(data, cf, "non-standard CA not supported, "
@@ -1006,7 +1006,7 @@ static CURLcode cf_msh3_query(struct Curl_cfilter *cf,
 
   switch(query) {
   case CF_QUERY_MAX_CONCURRENT: {
-    /* TODO: we do not have access to this so far, fake it */
+    /* We do not have access to this so far, fake it */
     (void)ctx;
     *pres1 = 100;
     return CURLE_OK;
@@ -1091,7 +1091,7 @@ CURLcode Curl_cf_msh3_create(struct Curl_cfilter **pcf,
 
   (void)data;
   (void)conn;
-  (void)ai; /* TODO: msh3 resolves itself? */
+  (void)ai; /* msh3 resolves itself? */
   ctx = calloc(1, sizeof(*ctx));
   if(!ctx) {
     result = CURLE_OUT_OF_MEMORY;

lib/vquic/curl_ngtcp2.c

@@ -394,7 +394,7 @@ static void quic_printf(void *user_data, const char *fmt, ...)
   struct Curl_cfilter *cf = user_data;
   struct cf_ngtcp2_ctx *ctx = cf->ctx;
 
-  (void)ctx;  /* TODO: need an easy handle to infof() message */
+  (void)ctx;  /* need an easy handle to infof() message */
   va_list ap;
   va_start(ap, fmt);
   vfprintf(stderr, fmt, ap);
@@ -1591,7 +1591,7 @@ static ssize_t cf_ngtcp2_send(struct Curl_cfilter *cf, struct Curl_easy *data,
   if(ctx->tls_vrfy_result)
     return ctx->tls_vrfy_result;
 
-  (void)eos; /* TODO: use for stream EOF and block handling */
+  (void)eos; /* use for stream EOF and block handling */
   result = cf_progress_ingress(cf, data, &pktx);
   if(result) {
     *err = result;
@@ -1965,8 +1965,8 @@ static CURLcode h3_data_pause(struct Curl_cfilter *cf,
                               struct Curl_easy *data,
                               bool pause)
 {
-  /* TODO: there seems right now no API in ngtcp2 to shrink/enlarge
-   * the streams windows. As we do in HTTP/2. */
+  /* There seems to exist no API in ngtcp2 to shrink/enlarge the streams
+   * windows. As we do in HTTP/2. */
   if(!pause) {
     h3_drain_stream(cf, data);
     Curl_expire(data, 0, EXPIRE_RUN_NOW);

lib/vquic/curl_osslq.c

@@ -1980,7 +1980,7 @@ static ssize_t cf_osslq_send(struct Curl_cfilter *cf, struct Curl_easy *data,
   ssize_t nwritten;
   CURLcode result;
 
-  (void)eos; /* TODO: use to end stream */
+  (void)eos; /* use to end stream */
   CF_DATA_SAVE(save, cf, data);
   DEBUGASSERT(cf->connected);
   DEBUGASSERT(ctx->tls.ossl.ssl);

lib/vquic/curl_quiche.c

@@ -926,8 +926,8 @@ static ssize_t cf_quiche_send_body(struct Curl_cfilter *cf,
   nwritten = quiche_h3_send_body(ctx->h3c, ctx->qconn, stream->id,
                                  (uint8_t *)buf, len, eos);
   if(nwritten == QUICHE_H3_ERR_DONE || (nwritten == 0 && len > 0)) {
-    /* TODO: we seem to be blocked on flow control and should HOLD
-     * sending. But when do we open again? */
+    /* Blocked on flow control and should HOLD sending. But when do we open
+     * again? */
     if(!quiche_conn_stream_writable(ctx->qconn, stream->id, len)) {
       CURL_TRC_CF(data, cf, "[%" FMT_PRIu64 "] send_body(len=%zu) "
                   "-> window exhausted", stream->id, len);
@@ -1204,8 +1204,8 @@ static CURLcode h3_data_pause(struct Curl_cfilter *cf,
                               struct Curl_easy *data,
                               bool pause)
 {
-  /* TODO: there seems right now no API in quiche to shrink/enlarge
-   * the streams windows. As we do in HTTP/2. */
+  /* There seems to exist no API in quiche to shrink/enlarge the streams
+   * windows. As we do in HTTP/2. */
   if(!pause) {
     h3_drain_stream(cf, data);
     Curl_expire(data, 0, EXPIRE_RUN_NOW);