examples: fix compiler warnings

docs/examples/certinfo.c

@@ -9,9 +9,12 @@
 
 static size_t wrfu(void *ptr,  size_t  size,  size_t  nmemb,  void *stream)
 {
+  (void)stream;
+  (void)ptr;
   return size * nmemb;
 }
-int main(int argc, char **argv)
+
+int main(void)
 {
   CURL *curl;
   CURLcode res;

docs/examples/debug.c

@@ -28,12 +28,12 @@ void dump(const char *text,
     /* without the hex output, we can fit more on screen */
     width = 0x40;
 
-  fprintf(stream, "%s, %010.10ld bytes (0x%08.8lx)\n",
+  fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n",
           text, (long)size, (long)size);
 
   for(i=0; i<size; i+= width) {
 
-    fprintf(stream, "%04.4lx: ", (long)i);
+    fprintf(stream, "%4.4lx: ", (long)i);
 
     if(!nohex) {
       /* hex not disabled, show it */

docs/examples/ftpgetinfo.c

@@ -21,6 +21,8 @@
 
 static size_t throw_away(void *ptr, size_t size, size_t nmemb, void *data)
 {
+  (void)ptr;
+  (void)data;
   /* we are not interested in the headers itself,
      so we only return the size we would have saved ... */
   return (size_t)(size * nmemb);
@@ -58,7 +60,7 @@ int main(void)
       if((CURLE_OK == res) && filetime)
         printf("filetime %s: %s", filename, ctime(&filetime));
       res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &filesize);
-      if((CURLE_OK == res) && filesize)
+      if((CURLE_OK == res) && (filesize>0))
         printf("filesize %s: %0.0f bytes\n", filename, filesize);
     } else {
       /* we failed */

docs/examples/ftpgetresp.c

@@ -27,7 +27,7 @@ write_response(void *ptr, size_t size, size_t nmemb, void *data)
   return fwrite(ptr, size, nmemb, writehere);
 }
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *curl;
   CURLcode res;

docs/examples/ftpupload.c

@@ -48,7 +48,7 @@ static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
   return retcode;
 }
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *curl;
   CURLcode res;

docs/examples/getinmemory.c

@@ -43,7 +43,7 @@ WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
 }
 
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *curl_handle;
 
@@ -87,7 +87,7 @@ int main(int argc, char **argv)
    * you're done with it, you should free() it as a nice application.
    */
 
-  printf("%lu bytes retrieved\n", chunk.size);
+  printf("%lu bytes retrieved\n", (long)chunk.size);
 
   if(chunk.memory)
     free(chunk.memory);

docs/examples/multi-app.c

@@ -27,7 +27,7 @@
 #define HTTP_HANDLE 0   /* Index for the HTTP transfer */
 #define FTP_HANDLE 1    /* Index for the FTP transfer */
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *handles[HANDLECOUNT];
   CURLM *multi_handle;

docs/examples/multi-debugcallback.c

@@ -37,12 +37,12 @@ void dump(const char *text,
     /* without the hex output, we can fit more on screen */
     width = 0x40;
 
-  fprintf(stream, "%s, %010.10ld bytes (0x%08.8lx)\n",
+  fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n",
           text, (long)size, (long)size);
 
   for(i=0; i<size; i+= width) {
 
-    fprintf(stream, "%04.4lx: ", (long)i);
+    fprintf(stream, "%4.4lx: ", (long)i);
 
     if(!nohex) {
       /* hex not disabled, show it */
@@ -79,6 +79,7 @@ int my_trace(CURL *handle, curl_infotype type,
 {
   const char *text;
 
+  (void)userp;
   (void)handle; /* prevent compiler warning */
 
   switch (type) {
@@ -108,7 +109,7 @@ int my_trace(CURL *handle, curl_infotype type,
 /*
  * Simply download a HTTP file.
  */
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *http_handle;
   CURLM *multi_handle;

docs/examples/multi-double.c

@@ -22,7 +22,7 @@
 /*
  * Simply download two HTTP files!
  */
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *http_handle;
   CURL *http_handle2;

docs/examples/multi-post.c

@@ -15,7 +15,7 @@
 
 #include <curl/curl.h>
 
-int main(int argc, char *argv[])
+int main(void)
 {
   CURL *curl;
 

docs/examples/multi-single.c

@@ -22,7 +22,7 @@
 /*
  * Simply download a HTTP file.
  */
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *http_handle;
   CURLM *multi_handle;

docs/examples/persistant.c

@@ -11,7 +11,7 @@
 #include <unistd.h>
 #include <curl/curl.h>
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *curl;
   CURLcode res;

docs/examples/sepheaders.c

@@ -21,7 +21,7 @@ static size_t write_data(void *ptr, size_t size, size_t nmemb, void *stream)
   return written;
 }
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *curl_handle;
   static const char *headerfilename = "head.out";

docs/examples/simplessl.c

@@ -32,7 +32,7 @@
 
 */
 
-int main(int argc, char **argv)
+int main(void)
 {
   CURL *curl;
   CURLcode res;
@@ -47,7 +47,7 @@ int main(int argc, char **argv)
 
   const char *pEngine;
 
-#if USE_ENGINE
+#ifdef USE_ENGINE
   pKeyName  = "rsa_test";
   pKeyType  = "ENG";
   pEngine   = "chil";            /* for nChiper HSM... */