Squelch redundant declaration warnings.

Have the text-to-pcap scanners define a routine that the main code
calls, which both allocates and destroys the scanner.  Don't declare the
Lex-generated routines in a header file we create, declare that routine,
instead.

Change-Id: Icad6a83db1a0dea8ac390315af72383fc99f8513
Reviewed-on: https://code.wireshark.org/review/25822
Petri-Dish: Guy Harris <guy@alum.mit.edu>
Tested-by: Petri Dish Buildbot
Reviewed-by: Guy Harris <guy@alum.mit.edu>

text2pcap-scanner.l

@@ -113,3 +113,13 @@ eol \r?\n\r?
  * Turn diagnostics back on, so we check the code that we've written.
  */
 DIAG_ON_FLEX
+
+int
+text2pcap_scan(void)
+{
+    int ret;
+
+    ret = text2pcap_lex();
+    text2pcap_lex_destroy();
+    return ret;
+}

text2pcap.c

@@ -1908,7 +1908,7 @@ main(int argc, char *argv[])
     curr_offset = header_length;
 
     text2pcap_in = input_file;
-    if (text2pcap_lex() == EXIT_SUCCESS) {
+    if (text2pcap_scan() == EXIT_SUCCESS) {
         if (write_current_packet(FALSE) != EXIT_SUCCESS)
             ret = EXIT_FAILURE;
     } else {
@@ -1923,7 +1923,6 @@ main(int argc, char *argv[])
                 bytes_written, (bytes_written == 1) ? "" : "s");
     }
 clean_exit:
-    text2pcap_lex_destroy();
     if (input_file) {
         fclose(input_file);
     }

text2pcap.h

@@ -27,9 +27,7 @@ typedef enum {
 
 int parse_token(token_t token, char *str);
 
-int text2pcap_lex(void);
-
-int text2pcap_lex_destroy(void);
+int text2pcap_scan(void);
 
 #endif
 

ui/text_import.c

@@ -905,7 +905,6 @@ parse_token (token_t token, char *str)
 int
 text_import(text_import_info_t *info)
 {
-    yyscan_t scanner;
     int ret;
     struct tm *now_tm;
 
@@ -1029,21 +1028,9 @@ text_import(text_import_info_t *info)
 
     max_offset = info->max_frame_length;
 
-    if (text_import_lex_init(&scanner) != 0) {
-        ret = errno;
-        g_free(packet_buf);
-        return ret;
-    }
-
-    text_import_set_in(info->import_text_file, scanner);
-
-    text_import_lex(scanner);
-
-    text_import_lex_destroy(scanner);
-
+    ret = text_import_scan(info->import_text_file);
     g_free(packet_buf);
-
-    return 0;
+    return ret;
 }
 
 /*

ui/text_import_scanner.h

@@ -34,7 +34,7 @@ void write_current_packet(void);
 
 extern FILE *text_importin;
 
-int text_importlex(void);
+int text_import_scan(FILE *input_file);
 
 #ifdef __cplusplus
 }

ui/text_import_scanner.l

@@ -142,3 +142,20 @@ eol \r?\n\r?
  * Turn diagnostics back on, so we check the code that we've written.
  */
 DIAG_ON_FLEX
+
+int
+text_import_scan(FILE *input_file)
+{
+    yyscan_t scanner;
+
+    if (text_import_lex_init(&scanner) != 0)
+        return errno;
+
+    text_import_set_in(input_file, scanner);
+
+    text_import_lex(scanner);
+
+    text_import_lex_destroy(scanner);
+
+    return 0;
+}