Resolved various compile-time warnings when building code. (This is due to

requirements on some projects I work on, where warning levels must be kept
to a minimum.)

mongoose.c

@@ -557,7 +557,7 @@ static void mg_strlcpy(register char *dst, register const char *src, size_t n) {
 }
 
 static int lowercase(const char *s) {
-  return tolower(* (unsigned char *) s);
+  return tolower(* (const unsigned char *) s);
 }
 
 static int mg_strncasecmp(const char *s1, const char *s2, size_t len) {
@@ -1280,11 +1280,11 @@ static int64_t push(FILE *fp, SOCKET sock, SSL *ssl, const char *buf,
     if (ssl != NULL) {
       n = SSL_write(ssl, buf + sent, k);
     } else if (fp != NULL) {
-      n = fwrite(buf + sent, 1, k, fp);
+      n = fwrite(buf + sent, 1, (size_t)k, fp);
       if (ferror(fp))
         n = -1;
     } else {
-      n = send(sock, buf + sent, k, 0);
+      n = send(sock, buf + sent, (size_t)k, 0);
     }
 
     if (n < 0)
@@ -1342,7 +1342,7 @@ int mg_read(struct mg_connection *conn, void *buf, size_t len) {
       if (len < (size_t) buffered_len) {
         buffered_len = len;
       }
-      memcpy(buf, buffered, buffered_len);
+      memcpy(buf, buffered, (size_t)buffered_len);
       len -= buffered_len;
       buf = (char *) buf + buffered_len;
       conn->consumed_content += buffered_len;
@@ -1378,7 +1378,7 @@ int mg_printf(struct mg_connection *conn, const char *fmt, ...) {
   len = mg_vsnprintf(conn, buf, sizeof(buf), fmt, ap);
   va_end(ap);
 
-  return mg_write(conn, buf, len);
+  return mg_write(conn, buf, (size_t)len);
 }
 
 // URL-decode input buffer into destination buffer.
@@ -1394,10 +1394,10 @@ static size_t url_decode(const char *src, size_t src_len, char *dst,
 
   for (i = j = 0; i < src_len && j < dst_len - 1; i++, j++) {
     if (src[i] == '%' &&
-        isxdigit(* (unsigned char *) (src + i + 1)) &&
-        isxdigit(* (unsigned char *) (src + i + 2))) {
-      a = tolower(* (unsigned char *) (src + i + 1));
-      b = tolower(* (unsigned char *) (src + i + 2));
+        isxdigit(* (const unsigned char *) (src + i + 1)) &&
+        isxdigit(* (const unsigned char *) (src + i + 2))) {
+      a = tolower(* (const unsigned char *) (src + i + 1));
+      b = tolower(* (const unsigned char *) (src + i + 2));
       dst[j] = (char) ((HEXTOI(a) << 4) | HEXTOI(b));
       i += 2;
     } else if (is_form_url_encoded && src[i] == '+') {
@@ -1435,7 +1435,7 @@ int mg_get_var(const char *buf, size_t buf_len, const char *name,
       p += name_len + 1;
 
       // Point s to the end of the value
-      s = (const char *) memchr(p, '&', e - p);
+      s = (const char *) memchr(p, '&', (size_t)(e - p));
       if (s == NULL) {
         s = e;
       }
@@ -1443,7 +1443,7 @@ int mg_get_var(const char *buf, size_t buf_len, const char *name,
 
       // Decode variable into destination buffer
       if ((size_t) (s - p) < dst_len) {
-        len = url_decode(p, s - p, dst, dst_len, 1);
+        len = url_decode(p, (size_t)(s - p), dst, dst_len, 1);
       }
       break;
     }
@@ -1478,7 +1478,7 @@ int mg_get_cookie(const struct mg_connection *conn, const char *cookie_name,
       }
       if ((size_t) (p - s) < dst_size) {
         len = (p - s) + 1;
-        mg_strlcpy(dst, s, len);
+        mg_strlcpy(dst, s, (size_t)len);
       }
       break;
     }
@@ -1532,7 +1532,7 @@ static int sslize(struct mg_connection *conn, int (*func)(SSL *)) {
     func(conn->ssl) == 1;
 }
 
-struct mg_connection *mg_connect(struct mg_connection *conn,
+static struct mg_connection *mg_connect(struct mg_connection *conn,
                                  const char *host, int port, int use_ssl) {
   struct mg_connection *newconn = NULL;
   struct sockaddr_in sin;
@@ -1579,8 +1579,8 @@ static int get_request_len(const char *buf, int buflen) {
   DEBUG_TRACE(("buf: %p, len: %d", buf, buflen));
   for (s = buf, e = s + buflen - 1; len <= 0 && s < e; s++)
     // Control characters are not allowed but >=128 is.
-    if (!isprint(* (unsigned char *) s) && *s != '\r' &&
-        *s != '\n' && * (unsigned char *) s < 128) {
+    if (!isprint(* (const unsigned char *) s) && *s != '\r' &&
+        *s != '\n' && * (const unsigned char *) s < 128) {
       len = -1;
     } else if (s[0] == '\n' && s[1] == '\n') {
       len = (int) (s - buf) + 2;
@@ -1758,7 +1758,7 @@ typedef struct MD5Context {
   unsigned char in[64];
 } MD5_CTX;
 
-#if __BYTE_ORDER == 1234
+#if defined(__BYTE_ORDER) && (__BYTE_ORDER == 1234)
 #define byteReverse(buf, len) // Do nothing
 #else
 static void byteReverse(unsigned char *buf, unsigned longs) {
@@ -1962,7 +1962,7 @@ void mg_md5(char *buf, ...) {
 
   va_start(ap, buf);
   while ((p = va_arg(ap, const char *)) != NULL) {
-    MD5Update(&ctx, (unsigned char *) p, (int) strlen(p));
+    MD5Update(&ctx, (const unsigned char *) p, (unsigned) strlen(p));
   }
   va_end(ap);
 
@@ -2257,13 +2257,13 @@ static void url_encode(const char *src, char *dst, size_t dst_len) {
   const char *end = dst + dst_len - 1;
 
   for (; *src != '\0' && dst < end; src++, dst++) {
-    if (isalnum(*(unsigned char *) src) ||
-        strchr(dont_escape, * (unsigned char *) src) != NULL) {
+    if (isalnum(*(const unsigned char *) src) ||
+        strchr(dont_escape, * (const unsigned char *) src) != NULL) {
       *dst = *src;
     } else if (dst + 2 < end) {
       dst[0] = '%';
-      dst[1] = hex[(* (unsigned char *) src) >> 4];
-      dst[2] = hex[(* (unsigned char *) src) & 0xf];
+      dst[1] = hex[(* (const unsigned char *) src) >> 4];
+      dst[2] = hex[(* (const unsigned char *) src) & 0xf];
       dst += 2;
     }
   }
@@ -2307,7 +2307,7 @@ static void print_dir_entry(struct de *de) {
 // On windows, __cdecl specification is needed in case if project is built
 // with __stdcall convention. qsort always requires __cdels callback.
 static int WINCDECL compare_dir_entries(const void *p1, const void *p2) {
-  const struct de *a = (struct de *) p1, *b = (struct de *) p2;
+  const struct de *a = (const struct de *) p1, *b = (const struct de *) p2;
   const char *query_string = a->conn->request_info.query_string;
   int cmp_result = 0;
 
@@ -2409,7 +2409,7 @@ static void handle_directory_request(struct mg_connection *conn,
       conn->request_info.uri, "..", "Parent directory", "-", "-");
 
   // Sort and print directory entries
-  qsort(entries, num_entries, sizeof(entries[0]), compare_dir_entries);
+  qsort(entries, (size_t)num_entries, sizeof(entries[0]), compare_dir_entries);
   for (i = 0; i < num_entries; i++) {
     print_dir_entry(&entries[i]);
     free(entries[i].file_name);
@@ -2432,11 +2432,11 @@ static void send_file_data(struct mg_connection *conn, FILE *fp, int64_t len) {
       to_read = (int) len;
 
     // Read from file, exit the loop on error
-    if ((num_read = fread(buf, 1, to_read, fp)) == 0)
+    if ((num_read = fread(buf, 1, (size_t)to_read, fp)) == 0)
       break;
 
     // Send read bytes to the client, exit the loop on error
-    if ((num_written = mg_write(conn, buf, num_read)) != num_read)
+    if ((num_written = mg_write(conn, buf, (size_t)num_read)) != num_read)
       break;
 
     // Both read and were successful, adjust counters
@@ -2852,7 +2852,7 @@ static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
     *p++ = '\0';
   } else {
     dir[0] = '.', dir[1] = '\0';
-    p = (char *) prog;
+    p = (const char *) prog;
   }
 
   pid = (pid_t) -1;
@@ -2919,7 +2919,7 @@ static void handle_cgi_request(struct mg_connection *conn, const char *prog) {
 
   // Send chunk of data that may be read after the headers
   conn->num_bytes_sent += mg_write(conn, buf + headers_len,
-                                   data_len - headers_len);
+                                   (size_t)(data_len - headers_len));
 
   // Read the rest of CGI output and send to the client
   send_file_data(conn, out, INT64_MAX);
@@ -3098,7 +3098,7 @@ static void send_ssi_file(struct mg_connection *conn, const char *path,
       assert(len <= (int) sizeof(buf));
       if (len < 6 || memcmp(buf, "<!--#", 5) != 0) {
         // Not an SSI tag, pass it
-        (void) mg_write(conn, buf, len);
+        (void) mg_write(conn, buf, (size_t)len);
       } else {
         if (!memcmp(buf + 5, "include", 7)) {
           do_ssi_include(conn, path, buf + 12, include_level);
@@ -3121,14 +3121,14 @@ static void send_ssi_file(struct mg_connection *conn, const char *path,
     } else if (ch == '<') {
       in_ssi_tag = 1;
       if (len > 0) {
-        (void) mg_write(conn, buf, len);
+        (void) mg_write(conn, buf, (size_t)len);
       }
       len = 0;
       buf[len++] = ch & 0xff;
     } else {
       buf[len++] = ch & 0xff;
       if (len == (int) sizeof(buf)) {
-        (void) mg_write(conn, buf, len);
+        (void) mg_write(conn, buf, (size_t)len);
         len = 0;
       }
     }
@@ -3136,7 +3136,7 @@ static void send_ssi_file(struct mg_connection *conn, const char *path,
 
   // Send the rest of buffered data
   if (len > 0) {
-    (void) mg_write(conn, buf, len);
+    (void) mg_write(conn, buf, (size_t)len);
   }
 }
 
@@ -3171,7 +3171,7 @@ static void handle_request(struct mg_connection *conn) {
     * conn->request_info.query_string++ = '\0';
   }
   uri_len = strlen(ri->uri);
-  (void) url_decode(ri->uri, uri_len, ri->uri, uri_len + 1, 0);
+  (void) url_decode(ri->uri, (size_t)uri_len, ri->uri, (size_t)(uri_len + 1), 0);
   remove_double_dots_and_double_slashes(ri->uri);
   convert_uri_to_file_name(conn, ri->uri, path, sizeof(path));
 
@@ -3549,7 +3549,7 @@ static int set_ssl_option(struct mg_context *ctx) {
   // Initialize locking callbacks, needed for thread safety.
   // http://www.openssl.org/support/faq.html#PROG1
   size = sizeof(pthread_mutex_t) * CRYPTO_num_locks();
-  if ((ssl_mutexes = (pthread_mutex_t *) malloc(size)) == NULL) {
+  if ((ssl_mutexes = (pthread_mutex_t *) malloc((size_t)size)) == NULL) {
     cry(fc(ctx), "%s: cannot allocate mutexes: %s", __func__, ssl_error());
     return 0;
   }
@@ -3644,7 +3644,7 @@ static void discard_current_request_from_buffer(struct mg_connection *conn) {
   }
 
   conn->data_len -= conn->request_len + body_len;
-  memmove(conn->buf, conn->buf + conn->request_len + body_len, conn->data_len);
+  memmove(conn->buf, conn->buf + conn->request_len + body_len, (size_t)conn->data_len);
 }
 
 static int parse_url(const char *url, char *host, int *port) {
@@ -3707,7 +3707,7 @@ static void handle_proxy_request(struct mg_connection *conn) {
   // Read data from the target and forward it to the client
   while ((n = pull(NULL, conn->peer->client.sock, conn->peer->ssl,
                    buf, sizeof(buf))) > 0) {
-    if (mg_write(conn, buf, n) != n) {
+    if (mg_write(conn, buf, (size_t)n) != n) {
       break;
     }
   }