Add missing 'static' on file-internal declarations.

sk_startup and sk_nextaddr are entirely internal to winnet.c; nearly
all of import.c and minibidi.c's internal routines should have been
static and weren't; {read,write}_utf8 are internal to charset/utf8.c
(and didn't even need separate declarations at all); do_sftp_cleanup
is internal to psftp.c, and get_listitemheight to gtkdlg.c.

While I was editing those prototypes anyway, I've also added missing
'const' to the 'char *' passphrase parameters in import,c.

charset/utf8.c

@@ -7,18 +7,13 @@
 #include "charset.h"
 #include "internal.h"
 
-void read_utf8(charset_spec const *, long int, charset_state *,
-	       void (*)(void *, long int), void *);
-void write_utf8(charset_spec const *, long int,
-		charset_state *, void (*)(void *, long int), void *);
-
 /*
  * UTF-8 has no associated data, so `charset' may be ignored.
  */
 
-void read_utf8(charset_spec const *charset, long int input_chr,
-	       charset_state *state,
-	       void (*emit)(void *ctx, long int output), void *emitctx)
+static void read_utf8(charset_spec const *charset, long int input_chr,
+                      charset_state *state,
+                      void (*emit)(void *ctx, long int output), void *emitctx)
 {
     UNUSEDARG(charset);
 
@@ -186,9 +181,9 @@ void read_utf8(charset_spec const *charset, long int input_chr,
  * charset_state.
  */
 
-void write_utf8(charset_spec const *charset, long int input_chr,
-		charset_state *state,
-		void (*emit)(void *ctx, long int output), void *emitctx)
+static void write_utf8(charset_spec const *charset, long int input_chr,
+                       charset_state *state,
+                       void (*emit)(void *ctx, long int output), void *emitctx)
 {
     UNUSEDARG(charset);
     UNUSEDARG(state);

import.c

@@ -12,26 +12,24 @@
 #include "ssh.h"
 #include "misc.h"
 
-bool openssh_pem_encrypted(const Filename *filename);
-bool openssh_new_encrypted(const Filename *filename);
-struct ssh2_userkey *openssh_pem_read(const Filename *filename,
-                                      char *passphrase,
-                                      const char **errmsg_p);
-struct ssh2_userkey *openssh_new_read(const Filename *filename,
-                                      char *passphrase,
-                                      const char **errmsg_p);
-bool openssh_auto_write(const Filename *filename, struct ssh2_userkey *key,
-                        char *passphrase);
-bool openssh_pem_write(const Filename *filename, struct ssh2_userkey *key,
-                       char *passphrase);
-bool openssh_new_write(const Filename *filename, struct ssh2_userkey *key,
-                       char *passphrase);
+static bool openssh_pem_encrypted(const Filename *file);
+static bool openssh_new_encrypted(const Filename *file);
+static struct ssh2_userkey *openssh_pem_read(
+    const Filename *file, const char *passphrase, const char **errmsg_p);
+static struct ssh2_userkey *openssh_new_read(
+    const Filename *file, const char *passphrase, const char **errmsg_p);
+static bool openssh_auto_write(
+    const Filename *file, struct ssh2_userkey *key, const char *passphrase);
+static bool openssh_pem_write(
+    const Filename *file, struct ssh2_userkey *key, const char *passphrase);
+static bool openssh_new_write(
+    const Filename *file, struct ssh2_userkey *key, const char *passphrase);
 
-bool sshcom_encrypted(const Filename *filename, char **comment);
-struct ssh2_userkey *sshcom_read(const Filename *filename, char *passphrase,
-				 const char **errmsg_p);
-bool sshcom_write(const Filename *filename, struct ssh2_userkey *key,
-                  char *passphrase);
+static bool sshcom_encrypted(const Filename *file, char **comment);
+static struct ssh2_userkey *sshcom_read(
+    const Filename *file, const char *passphrase, const char **errmsg_p);
+static bool sshcom_write(
+    const Filename *file, struct ssh2_userkey *key, const char *passphrase);
 
 /*
  * Given a key type, determine whether we know how to import it.
@@ -482,7 +480,7 @@ static struct openssh_pem_key *load_openssh_pem_key(const Filename *filename,
     return NULL;
 }
 
-bool openssh_pem_encrypted(const Filename *filename)
+static bool openssh_pem_encrypted(const Filename *filename)
 {
     struct openssh_pem_key *key = load_openssh_pem_key(filename, NULL);
     bool ret;
@@ -496,9 +494,8 @@ bool openssh_pem_encrypted(const Filename *filename)
     return ret;
 }
 
-struct ssh2_userkey *openssh_pem_read(const Filename *filename,
-                                      char *passphrase,
-                                      const char **errmsg_p)
+static struct ssh2_userkey *openssh_pem_read(
+    const Filename *filename, const char *passphrase, const char **errmsg_p)
 {
     struct openssh_pem_key *key = load_openssh_pem_key(filename, errmsg_p);
     struct ssh2_userkey *retkey;
@@ -775,8 +772,8 @@ struct ssh2_userkey *openssh_pem_read(const Filename *filename,
     return retval;
 }
 
-bool openssh_pem_write(const Filename *filename, struct ssh2_userkey *key,
-                       char *passphrase)
+static bool openssh_pem_write(
+    const Filename *filename, struct ssh2_userkey *key, const char *passphrase)
 {
     strbuf *pubblob, *privblob, *outblob;
     unsigned char *spareblob;
@@ -1319,7 +1316,7 @@ static struct openssh_new_key *load_openssh_new_key(const Filename *filename,
     return NULL;
 }
 
-bool openssh_new_encrypted(const Filename *filename)
+static bool openssh_new_encrypted(const Filename *filename)
 {
     struct openssh_new_key *key = load_openssh_new_key(filename, NULL);
     bool ret;
@@ -1334,9 +1331,8 @@ bool openssh_new_encrypted(const Filename *filename)
     return ret;
 }
 
-struct ssh2_userkey *openssh_new_read(const Filename *filename,
-                                      char *passphrase,
-                                      const char **errmsg_p)
+static struct ssh2_userkey *openssh_new_read(
+    const Filename *filename, const char *passphrase, const char **errmsg_p)
 {
     struct openssh_new_key *key = load_openssh_new_key(filename, errmsg_p);
     struct ssh2_userkey *retkey = NULL;
@@ -1515,8 +1511,8 @@ struct ssh2_userkey *openssh_new_read(const Filename *filename,
     return retval;
 }
 
-bool openssh_new_write(const Filename *filename, struct ssh2_userkey *key,
-                       char *passphrase)
+static bool openssh_new_write(
+    const Filename *filename, struct ssh2_userkey *key, const char *passphrase)
 {
     strbuf *pubblob, *privblob, *cblob;
     int padvalue, i;
@@ -1644,8 +1640,8 @@ bool openssh_new_write(const Filename *filename, struct ssh2_userkey *key,
  * The switch function openssh_auto_write(), which chooses one of the
  * concrete OpenSSH output formats based on the key type.
  */
-bool openssh_auto_write(const Filename *filename, struct ssh2_userkey *key,
-                        char *passphrase)
+static bool openssh_auto_write(
+    const Filename *filename, struct ssh2_userkey *key, const char *passphrase)
 {
     /*
      * The old OpenSSH format supports a fixed list of key types. We
@@ -1905,7 +1901,7 @@ static struct sshcom_key *load_sshcom_key(const Filename *filename,
     return NULL;
 }
 
-bool sshcom_encrypted(const Filename *filename, char **comment)
+static bool sshcom_encrypted(const Filename *filename, char **comment)
 {
     struct sshcom_key *key = load_sshcom_key(filename, NULL);
     BinarySource src[1];
@@ -1970,8 +1966,8 @@ static ptrlen BinarySource_get_mp_sshcom_as_string(BinarySource *src)
 #define get_mp_sshcom_as_string(bs) \
     BinarySource_get_mp_sshcom_as_string(BinarySource_UPCAST(bs))
 
-struct ssh2_userkey *sshcom_read(const Filename *filename, char *passphrase,
-				 const char **errmsg_p)
+static struct ssh2_userkey *sshcom_read(
+    const Filename *filename, const char *passphrase, const char **errmsg_p)
 {
     struct sshcom_key *key = load_sshcom_key(filename, errmsg_p);
     const char *errmsg;
@@ -2181,8 +2177,8 @@ struct ssh2_userkey *sshcom_read(const Filename *filename, char *passphrase,
     return ret;
 }
 
-bool sshcom_write(const Filename *filename, struct ssh2_userkey *key,
-                  char *passphrase)
+static bool sshcom_write(
+    const Filename *filename, struct ssh2_userkey *key, const char *passphrase)
 {
     strbuf *pubblob, *privblob, *outblob;
     ptrlen numbers[6];

minibidi.c

@@ -55,14 +55,15 @@ typedef struct bidi_char {
 } bidi_char;
 
 /* function declarations */
-void flipThisRun(bidi_char *from, unsigned char* level, int max, int count);
-int findIndexOfRun(unsigned char* level , int start, int count, int tlevel);
-unsigned char getType(int ch);
-unsigned char setOverrideBits(unsigned char level, unsigned char override);
-int getPreviousLevel(unsigned char* level, int from);
-int do_shape(bidi_char *line, bidi_char *to, int count);
-int do_bidi(bidi_char *line, int count);
-void doMirror(unsigned int *ch);
+static void flipThisRun(
+    bidi_char *from, unsigned char *level, int max, int count);
+static int findIndexOfRun(
+    unsigned char *level, int start, int count, int tlevel);
+static unsigned char getType(int ch);
+static unsigned char setOverrideBits(
+    unsigned char level, unsigned char override);
+static int getPreviousLevel(unsigned char *level, int from);
+static void doMirror(unsigned int *ch);
 
 /* character types */
 enum {
@@ -297,7 +298,8 @@ const shape_node shapetypes[] = {
  * max: the maximum level found in this line (should be unsigned char)
  * count: line size in bidi_char
  */
-void flipThisRun(bidi_char *from, unsigned char *level, int max, int count)
+static void flipThisRun(
+    bidi_char *from, unsigned char *level, int max, int count)
 {
     int i, j, k, tlevel;
     bidi_char temp;
@@ -323,7 +325,8 @@ void flipThisRun(bidi_char *from, unsigned char *level, int max, int count)
 /*
  * Finds the index of a run with level equals tlevel
  */
-int findIndexOfRun(unsigned char* level , int start, int count, int tlevel)
+static int findIndexOfRun(
+    unsigned char *level , int start, int count, int tlevel)
 {
     int i;
     for (i=start; i<count; i++) {
@@ -355,7 +358,7 @@ perl -ne 'split ";"; $num = hex $_[0]; $type = $_[4];' \
     UnicodeData.txt
 
  */
-unsigned char getType(int ch)
+static unsigned char getType(int ch)
 {
     static const struct {
 	int first, last, type;
@@ -1045,7 +1048,8 @@ int is_rtl(int c)
  * This function sets the override bits of level according
  * to the value in override, and reurns the new byte.
  */
-unsigned char setOverrideBits(unsigned char level, unsigned char override)
+static unsigned char setOverrideBits(
+    unsigned char level, unsigned char override)
 {
     if (override == ON)
 	return level;
@@ -1061,7 +1065,7 @@ unsigned char setOverrideBits(unsigned char level, unsigned char override)
  * return the value _before_ it. Used to process U+202C POP
  * DIRECTIONAL FORMATTING.
  */
-int getPreviousLevel(unsigned char* level, int from)
+static int getPreviousLevel(unsigned char *level, int from)
 {
     if (from > 0) {
         unsigned char current = level[--from];
@@ -1630,7 +1634,7 @@ int do_bidi(bidi_char *line, int count)
  * takes a pointer to a character that is checked for
  * having a mirror glyph.
  */
-void doMirror(unsigned int *ch)
+static void doMirror(unsigned int *ch)
 {
     if ((*ch & 0xFF00) == 0) {
 	switch (*ch) {

psftp.c

@@ -26,7 +26,7 @@ const char *const appname = "PSFTP";
 
 static int psftp_connect(char *userhost, char *user, int portnumber);
 static int do_sftp_init(void);
-void do_sftp_cleanup();
+static void do_sftp_cleanup(void);
 
 /* ----------------------------------------------------------------------
  * sftp client state.
@@ -2383,7 +2383,7 @@ static int do_sftp_init(void)
     return 0;
 }
 
-void do_sftp_cleanup()
+static void do_sftp_cleanup(void)
 {
     char ch;
     if (backend) {

unix/gtkdlg.c

@@ -150,7 +150,7 @@ static void coloursel_ok(GtkButton *button, gpointer data);
 static void coloursel_cancel(GtkButton *button, gpointer data);
 #endif
 static void dlgparam_destroy(GtkWidget *widget, gpointer data);
-int get_listitemheight(GtkWidget *widget);
+static int get_listitemheight(GtkWidget *widget);
 
 static int uctrl_cmp_byctrl(void *av, void *bv)
 {
@@ -2836,7 +2836,7 @@ void shortcut_add(struct Shortcuts *scs, GtkWidget *labelw,
     shortcut_highlight(labelw, chr);
 }
 
-int get_listitemheight(GtkWidget *w)
+static int get_listitemheight(GtkWidget *w)
 {
 #if !GTK_CHECK_VERSION(2,0,0)
     GtkWidget *listitem = gtk_list_item_new_with_label("foo");

windows/winnet.c

@@ -206,7 +206,7 @@ static HMODULE winsock2_module = NULL;
 static HMODULE wship6_module = NULL;
 #endif
 
-bool sk_startup(int hi, int lo)
+static bool sk_startup(int hi, int lo)
 {
     WORD winsock_ver;
 
@@ -590,7 +590,7 @@ SockAddr *sk_namedpipe_addr(const char *pipename)
     return ret;
 }
 
-bool sk_nextaddr(SockAddr *addr, SockAddrStep *step)
+static bool sk_nextaddr(SockAddr *addr, SockAddrStep *step)
 {
 #ifndef NO_IPV6
     if (step->ai) {