examples: reduce variable scopes

Closes https://github.com/curl/curl/pull/3919

docs/examples/cacertinmem.c

@@ -85,7 +85,6 @@ static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
 
   BIO *cbio = BIO_new_mem_buf(mypem, sizeof(mypem));
   X509_STORE  *cts = SSL_CTX_get_cert_store((SSL_CTX *)sslctx);
-  X509_INFO *itmp;
   int i;
   STACK_OF(X509_INFO) *inf;
   (void)curl;
@@ -103,7 +102,7 @@ static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
   }
 
   for(i = 0; i < sk_X509_INFO_num(inf); i++) {
-    itmp = sk_X509_INFO_value(inf, i);
+    X509_INFO *itmp = sk_X509_INFO_value(inf, i);
     if(itmp->x509) {
       X509_STORE_add_cert(cts, itmp->x509);
     }

docs/examples/curlgtk.c

@@ -45,13 +45,12 @@ int my_progress_func(GtkWidget *bar,
 void *my_thread(void *ptr)
 {
   CURL *curl;
-  FILE *outfile;
-  gchar *url = ptr;
 
   curl = curl_easy_init();
   if(curl) {
+    gchar *url = ptr;
     const char *filename = "test.curl";
-    outfile = fopen(filename, "wb");
+    FILE *outfile = fopen(filename, "wb");
 
     curl_easy_setopt(curl, CURLOPT_URL, url);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, outfile);

docs/examples/ephiperfifo.c

@@ -472,8 +472,6 @@ void SignalHandler(int signo)
 int main(int argc _Unused, char **argv _Unused)
 {
   GlobalInfo g;
-  int err;
-  int idx;
   struct itimerspec its;
   struct epoll_event ev;
   struct epoll_event events[10];
@@ -518,8 +516,9 @@ int main(int argc _Unused, char **argv _Unused)
   fprintf(MSG_OUT, "Entering wait loop\n");
   fflush(MSG_OUT);
   while(!g_should_exit_) {
-    err = epoll_wait(g.epfd, events, sizeof(events)/sizeof(struct epoll_event),
-                     10000);
+    int idx;
+    int err = epoll_wait(g.epfd, events,
+                         sizeof(events)/sizeof(struct epoll_event), 10000);
     if(err == -1) {
       if(errno == EINTR) {
         fprintf(MSG_OUT, "note: wait interrupted\n");

docs/examples/htmltidy.c

@@ -74,13 +74,14 @@ void dumpNode(TidyDoc doc, TidyNode tnod, int indent)
 
 int main(int argc, char **argv)
 {
+  if(argc == 2) {
     CURL *curl;
     char curl_errbuf[CURL_ERROR_SIZE];
     TidyDoc tdoc;
     TidyBuffer docbuf = {0};
     TidyBuffer tidy_errbuf = {0};
     int err;
-  if(argc == 2) {
+
     curl = curl_easy_init();
     curl_easy_setopt(curl, CURLOPT_URL, argv[1]);
     curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, curl_errbuf);

docs/examples/imap-append.c

@@ -85,14 +85,15 @@ int main(void)
 {
   CURL *curl;
   CURLcode res = CURLE_OK;
+
+  curl = curl_easy_init();
+  if(curl) {
     const char **p;
     long infilesize;
     struct upload_status upload_ctx;
 
     upload_ctx.lines_read = 0;
 
-  curl = curl_easy_init();
-  if(curl) {
     /* Set username and password */
     curl_easy_setopt(curl, CURLOPT_USERNAME, "user");
     curl_easy_setopt(curl, CURLOPT_PASSWORD, "secret");

docs/examples/multi-app.c

@@ -147,11 +147,11 @@ int main(void)
   /* See how the transfers went */
   while((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
     if(msg->msg == CURLMSG_DONE) {
-      int idx, found = 0;
+      int idx;
 
       /* Find out which handle this message is about */
       for(idx = 0; idx<HANDLECOUNT; idx++) {
-        found = (msg->easy_handle == handles[idx]);
+        int found = (msg->easy_handle == handles[idx]);
         if(found)
           break;
       }

docs/examples/sendrecv.c

@@ -59,12 +59,9 @@ static int wait_on_socket(curl_socket_t sockfd, int for_recv, long timeout_ms)
 int main(void)
 {
   CURL *curl;
-  CURLcode res;
   /* Minimalistic http request */
   const char *request = "GET / HTTP/1.0\r\nHost: example.com\r\n\r\n";
   size_t request_len = strlen(request);
-  curl_socket_t sockfd;
-  size_t nsent_total = 0;
 
   /* A general note of caution here: if you're using curl_easy_recv() or
      curl_easy_send() to implement HTTP or _any_ other protocol libcurl
@@ -76,6 +73,10 @@ int main(void)
 
   curl = curl_easy_init();
   if(curl) {
+    CURLcode res;
+    curl_socket_t sockfd;
+    size_t nsent_total = 0;
+
     curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
     /* Do not do the transfer - only connect to host */
     curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);

docs/examples/shared-connection-cache.c

@@ -46,8 +46,6 @@ static void my_unlock(CURL *handle, curl_lock_data data, void *useptr)
 
 int main(void)
 {
-  CURL *curl;
-  CURLcode res;
   CURLSH *share;
   int i;
 
@@ -61,8 +59,10 @@ int main(void)
      still reuse connections since the pool is in the shared object! */
 
   for(i = 0; i < 3; i++) {
-    curl = curl_easy_init();
+    CURL *curl = curl_easy_init();
     if(curl) {
+      CURLcode res;
+
       curl_easy_setopt(curl, CURLOPT_URL, "https://curl.haxx.se/");
 
       /* use the share object */

docs/examples/smooth-gtk-thread.c

@@ -67,13 +67,12 @@ size_t write_file(void *ptr, size_t size, size_t nmemb, FILE *stream)
 /* https://weather.com/weather/today/l/46214?cc=*&dayf=5&unit=i */
 void *pull_one_url(void *NaN)
 {
-  CURL *curl;
-  gchar *http;
-  FILE *outfile;
-
   /* Stop threads from entering unless j is incremented */
   pthread_mutex_lock(&lock);
   while(j < num_urls) {
+    CURL *curl;
+    gchar *http;
+
     printf("j = %d\n", j);
 
     http =
@@ -85,7 +84,7 @@ void *pull_one_url(void *NaN)
     curl = curl_easy_init();
     if(curl) {
 
-      outfile = fopen(urls[j], "wb");
+      FILE *outfile = fopen(urls[j], "wb");
 
       /* Set the URL and transfer type */
       curl_easy_setopt(curl, CURLOPT_URL, http);

docs/examples/smtp-mime.c

@@ -70,6 +70,9 @@ int main(void)
 {
   CURL *curl;
   CURLcode res = CURLE_OK;
+
+  curl = curl_easy_init();
+  if(curl) {
     struct curl_slist *headers = NULL;
     struct curl_slist *recipients = NULL;
     struct curl_slist *slist = NULL;
@@ -78,8 +81,6 @@ int main(void)
     curl_mimepart *part;
     const char **cpp;
 
-  curl = curl_easy_init();
-  if(curl) {
     /* This is the URL for your mailserver */
     curl_easy_setopt(curl, CURLOPT_URL, "smtp://mail.example.com");
 

docs/examples/synctime.c

@@ -257,25 +257,15 @@ int main(int argc, char *argv[])
 {
   CURL    *curl;
   conf_t  conf[1];
-  int     OptionIndex;
-  struct  tm *lt;
-  struct  tm *gmt;
-  time_t  tt;
-  time_t  tt_local;
-  time_t  tt_gmt;
-  double  tzonediffFloat;
-  int     tzonediffWord;
-  char    timeBuf[61];
-  char    tzoneBuf[16];
   int     RetValue;
 
-  OptionIndex     = 0;
   ShowAllHeader   = 0;    /* Do not show HTTP Header */
   AutoSyncTime    = 0;    /* Do not synchronise computer clock */
   RetValue        = 0;    /* Successful Exit */
   conf_init(conf);
 
   if(argc > 1) {
+    int OptionIndex = 0;
     while(OptionIndex < argc) {
       if(strncmp(argv[OptionIndex], "--server=", 9) == 0)
         snprintf(conf->timeserver, MAX_STRING, "%s", &argv[OptionIndex][9]);
@@ -308,6 +298,16 @@ int main(int argc, char *argv[])
   curl_global_init(CURL_GLOBAL_ALL);
   curl = curl_easy_init();
   if(curl) {
+    struct tm *lt;
+    struct tm *gmt;
+    time_t tt;
+    time_t tt_local;
+    time_t tt_gmt;
+    double tzonediffFloat;
+    int tzonediffWord;
+    char timeBuf[61];
+    char tzoneBuf[16];
+
     SyncTime_CURL_Init(curl, conf->http_proxy, conf->proxy_user);
 
     /* Calculating time diff between GMT and localtime */