clean: remove needless LWS_PRE

Several examples trim their buffer with an extra LWS_PRE from the end...
actually end should point to end the end of buf without a second LWS_PRE
reservation.

warmcat#2629

Author: nick87720z

minimal-examples-lowlevel/http-client/minimal-http-client-multi/minimal-http-client-multi.c

@@ -167,7 +167,7 @@ callback_http(struct lws *wsi, enum lws_callback_reasons reason,
 	      void *user, void *in, size_t len)
 {
 	char buf[LWS_PRE + 1024], *start = &buf[LWS_PRE], *p = start,
-	     *end = &buf[sizeof(buf) - LWS_PRE - 1];
+	     *end = &buf[sizeof(buf) - 1];
 	int n, idx = (int)(intptr_t)lws_get_opaque_user_data(wsi);
 	struct pss *pss = (struct pss *)user;
 

minimal-examples-lowlevel/http-client/minimal-http-client-post/minimal-http-client-post.c

@@ -30,7 +30,7 @@ callback_http(struct lws *wsi, enum lws_callback_reasons reason,
 {
 	struct pss *pss = (struct pss *)user;
 	char buf[LWS_PRE + 1024], *start = &buf[LWS_PRE], *p = start,
-		*end = &buf[sizeof(buf) - LWS_PRE - 1];
+		*end = &buf[sizeof(buf) - 1];
 	int n;
 
 	switch (reason) {

minimal-examples-lowlevel/http-server/minimal-http-server-custom-headers/minimal-http-server-custom-headers.c

@@ -37,7 +37,7 @@ callback_http(struct lws *wsi, enum lws_callback_reasons reason,
 	      void *user, void *in, size_t len)
 {
 	uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
-		*end = &buf[sizeof(buf) - LWS_PRE - 1];
+		*end = &buf[sizeof(buf) - 1];
 	struct pss *pss = (struct pss *)user;
 	char value[32], *pr = &pss->result[LWS_PRE];
 	size_t e = sizeof(pss->result) - LWS_PRE;

minimal-examples-lowlevel/http-server/minimal-http-server-dynamic/minimal-http-server-dynamic.c

@@ -42,7 +42,7 @@ callback_dynamic_http(struct lws *wsi, enum lws_callback_reasons reason,
 {
 	struct pss *pss = (struct pss *)user;
 	uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
-		*end = &buf[sizeof(buf) - LWS_PRE - 1];
+		*end = &buf[sizeof(buf) - 1];
 	time_t t;
 	int n;
 #if defined(LWS_HAVE_CTIME_R)

minimal-examples-lowlevel/http-server/minimal-http-server-h2-long-poll/minimal-http-server.c

@@ -57,7 +57,7 @@ callback_http(struct lws *wsi, enum lws_callback_reasons reason, void *user,
 	struct pss * pss = (struct pss *)user;
 	uint8_t buf[LWS_PRE + LWS_RECOMMENDED_MIN_HEADER_SPACE],
 		*start = &buf[LWS_PRE], *p = start,
-		*end = p + sizeof(buf) - LWS_PRE;
+		*end = buf + sizeof(buf) - 1;
 	int m, n;
 
 	switch (reason) {

plugins/acme-client/protocol_lws_acme_client.c

@@ -136,7 +136,7 @@ callback_chall_http01(struct lws *wsi, enum lws_callback_reasons reason,
 	struct lws_vhost *vhost = lws_get_vhost(wsi);
 	struct acme_connection *ac = lws_vhost_user(vhost);
 	uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
-		*end = &buf[sizeof(buf) - LWS_PRE - 1];
+		*end = &buf[sizeof(buf) - 1];
 	int n;
 
 	switch (reason) {

plugins/deaddrop/protocol_lws_deaddrop.c

@@ -383,7 +383,7 @@ callback_deaddrop(struct lws *wsi, enum lws_callback_reasons reason,
 	struct pss_deaddrop *pss = (struct pss_deaddrop *)user;
 	uint8_t buf[LWS_PRE + LWS_RECOMMENDED_MIN_HEADER_SPACE],
 		*start = &buf[LWS_PRE], *p = start,
-		*end = &buf[sizeof(buf) - LWS_PRE - 1];
+		*end = &buf[sizeof(buf) - 1];
 	char fname[256], *wp;
 	const char *cp;
 	int n, m, was;

plugins/protocol_fulltext_demo.c

@@ -65,7 +65,7 @@ callback_fts(struct lws *wsi, enum lws_callback_reasons reason, void *user,
 					 lws_get_protocol(wsi));
 	struct pss_fts_demo *pss = (struct pss_fts_demo *)user;
 	uint8_t buf[LWS_PRE + 2048], *start = &buf[LWS_PRE], *p = start,
-		*end = &buf[sizeof(buf) - LWS_PRE - 1];
+		*end = &buf[sizeof(buf) - 1];
 	struct lws_fts_search_params params;
 	const char *ccp = (const char *)in;
 	struct lws_fts_result *result;