Fix all reported warnings when -Wall is enabled and enable -Wall by default. While there, move OPTS to end of CFLAGS. This allows the user to override default options.

Makefile.in

@@ -35,7 +35,7 @@ RC_DIR = @RC_DIR@
 ETC_DIR = $(sysconfdir)
 CONF_DIR = $(sysconfdir)/$(PACKAGE)
 
-CFLAGS = $(OPTS) -I. -I$(top_srcdir) @CFLAGS@ $(CPPFLAGS) $(DEFS)
+CFLAGS = -Wall -I. -I$(top_srcdir) @CFLAGS@ $(CPPFLAGS) $(DEFS) $(OPTS)
 WCCFLAGS = @WCCFLAGS@
 CPPFLAGS = @CPPFLAGS@
 DEFS = @DEFS@ -DAUXBIN_DIR=\"$(AUXBIN_DIR)\" \

Str.c

@@ -520,10 +520,8 @@ Sprintf(char *fmt, ...)
 	case SP_PREC:
 	    if (IS_ALPHA(*f)) {
 		/* conversion char. */
-		double vd;
 		int vi;
 		char *vs;
-		void *vp;
 
 		switch (*f) {
 		case 'l':
@@ -545,7 +543,7 @@ Sprintf(char *fmt, ...)
 		case 'e':
 		case 'G':
 		case 'E':
-		    vd = va_arg(ap, double);
+		    va_arg(ap, double);
 		    len += (p > 0) ? p : 15;
 		    break;
 		case 'c':
@@ -558,11 +556,11 @@ Sprintf(char *fmt, ...)
 		    len += (p > vi) ? p : vi;
 		    break;
 		case 'p':
-		    vp = va_arg(ap, void *);
+		    va_arg(ap, void *);
 		    len += 10;
 		    break;
 		case 'n':
-		    vp = va_arg(ap, void *);
+		    va_arg(ap, void *);
 		    break;
 		}
 		status = SP_NORMAL;

buffer.c

@@ -239,7 +239,7 @@ writeBufferName(Buffer *buf, int n)
 void
 gotoLine(Buffer *buf, int n)
 {
-    char msg[32];
+    char msg[36];
     Line *l = buf->firstLine;
 
     if (l == NULL)
@@ -284,7 +284,7 @@ gotoLine(Buffer *buf, int n)
 void
 gotoRealLine(Buffer *buf, int n)
 {
-    char msg[32];
+    char msg[36];
     Line *l = buf->firstLine;
 
     if (l == NULL)

display.c

@@ -1368,15 +1368,14 @@ cursorRight(Buffer *buf, int n)
 {
     int i, delta = 1, cpos, vpos2;
     Line *l = buf->currentLine;
-    Lineprop *p;
 
     if (buf->firstLine == NULL)
 	return;
     if (buf->pos == l->len && !(l->next && l->next->bpos))
 	return;
     i = buf->pos;
-    p = l->propBuf;
 #ifdef USE_M17N
+    Lineprop *p = l->propBuf;
     while (i + delta < l->len && p[i + delta] & PC_WCHAR2)
 	delta++;
 #endif
@@ -1419,13 +1418,12 @@ cursorLeft(Buffer *buf, int n)
 {
     int i, delta = 1, cpos;
     Line *l = buf->currentLine;
-    Lineprop *p;
 
     if (buf->firstLine == NULL)
 	return;
     i = buf->pos;
-    p = l->propBuf;
 #ifdef USE_M17N
+    Lineprop *p = l->propBuf;
     while (i - delta > 0 && p[i - delta] & PC_WCHAR2)
 	delta++;
 #endif

etc.c

@@ -253,8 +253,10 @@ checkType(Str s, Lineprop **oprop, Linecolor **ocolor)
     char *es = NULL;
 #endif
     int do_copy = FALSE;
+#ifdef USE_M17N
     int i;
     int plen = 0, clen;
+#endif
 
     if (prop_size < s->length) {
 	prop_size = (s->length > LINELEN) ? s->length : LINELEN;
@@ -429,7 +431,6 @@ checkType(Str s, Lineprop **oprop, Linecolor **ocolor)
 	}
 #endif
 
-	plen = get_mclen(str);
 	mode = get_mctype(str) | effect;
 #ifdef USE_ANSI_COLOR
 	if (color) {
@@ -439,6 +440,7 @@ checkType(Str s, Lineprop **oprop, Linecolor **ocolor)
 #endif
 	*(prop++) = mode;
 #ifdef USE_M17N
+	plen = get_mclen(str);
 	if (plen > 1) {
 	    mode = (mode & ~PC_WCHAR1) | PC_WCHAR2;
 	    for (i = 1; i < plen; i++) {
@@ -2019,13 +2021,15 @@ static char Base64Table[] =
     "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 Str
-base64_encode(const unsigned char *src, size_t len)
+base64_encode(const char *src, size_t len)
 {
     Str dest;
-    const unsigned char *in, *endw;
+    const unsigned char *in, *endw, *s;
     unsigned long j;
     size_t k;
 
+    s = (unsigned char*)src;
+
     k = len;
     if (k % 3)
 	k += 3 - (k % 3);
@@ -2041,9 +2045,9 @@ base64_encode(const unsigned char *src, size_t len)
 	return Strnew();
     }
 
-    in = src;
+    in = s;
 
-    endw = src + len - 2;
+    endw = s + len - 2;
 
     while (in < endw) {
 	j = *in++;
@@ -2056,9 +2060,9 @@ base64_encode(const unsigned char *src, size_t len)
 	Strcatc(dest, Base64Table[j & 0x3f]);
     }
 
-    if (src + len - in) {
+    if (s + len - in) {
 	j = *in++;
-	if (src + len - in) {
+	if (s + len - in) {
 	    j = j << 8 | *in++;
 	    j = j << 8;
 	    Strcatc(dest, Base64Table[(j >> 18) & 0x3f]);

file.c

@@ -1290,7 +1290,7 @@ AuthDigestCred(struct http_auth *ha, Str uname, Str pw, ParsedURL *pu,
     tmp = Strnew_m_charp(uname->ptr, ":",
 			 qstr_unquote(get_auth_param(ha->param, "realm"))->ptr,
 			 ":", pw->ptr, NULL);
-    MD5(tmp->ptr, strlen(tmp->ptr), md5);
+    MD5((unsigned char *)tmp->ptr, strlen(tmp->ptr), md5);
     a1buf = digest_hex(md5);
 
     if (algorithm) {
@@ -1303,7 +1303,7 @@ AuthDigestCred(struct http_auth *ha, Str uname, Str pw, ParsedURL *pu,
 	    tmp = Strnew_m_charp(a1buf->ptr, ":",
 				 qstr_unquote(nonce)->ptr,
 				 ":", qstr_unquote(cnonce)->ptr, NULL);
-	    MD5(tmp->ptr, strlen(tmp->ptr), md5);
+	    MD5((unsigned char *)tmp->ptr, strlen(tmp->ptr), md5);
 	    a1buf = digest_hex(md5);
 	}
 	else if (strcasecmp(algorithm->ptr, "MD5") == 0)
@@ -1325,23 +1325,23 @@ AuthDigestCred(struct http_auth *ha, Str uname, Str pw, ParsedURL *pu,
 		    Str ebody;
 		    ebody = Strfgetall(fp);
 		    fclose(fp);
-		    MD5(ebody->ptr, strlen(ebody->ptr), md5);
+		    MD5((unsigned char *)ebody->ptr, strlen(ebody->ptr), md5);
 		}
 		else {
-		    MD5("", 0, md5);
+		    MD5((unsigned char *)"", 0, md5);
 		}
 	    }
 	    else {
-		MD5(request->body, request->length, md5);
+		MD5((unsigned char *)request->body, request->length, md5);
 	    }
 	}
 	else {
-	    MD5("", 0, md5);
+	    MD5((unsigned char *)"", 0, md5);
 	}
 	Strcat_char(tmp, ':');
 	Strcat(tmp, digest_hex(md5));
     }
-    MD5(tmp->ptr, strlen(tmp->ptr), md5);
+    MD5((unsigned char *)tmp->ptr, strlen(tmp->ptr), md5);
     a2buf = digest_hex(md5);
 
     if (qop_i >= QOP_AUTH) {
@@ -1359,7 +1359,7 @@ AuthDigestCred(struct http_auth *ha, Str uname, Str pw, ParsedURL *pu,
 			     ":", qstr_unquote(cnonce)->ptr,
 			     ":", qop_i == QOP_AUTH ? "auth" : "auth-int",
 			     ":", a2buf->ptr, NULL);
-	MD5(tmp->ptr, strlen(tmp->ptr), md5);
+	MD5((unsigned char *)tmp->ptr, strlen(tmp->ptr), md5);
 	rd = digest_hex(md5);
     }
     else {
@@ -1369,7 +1369,7 @@ AuthDigestCred(struct http_auth *ha, Str uname, Str pw, ParsedURL *pu,
 	tmp = Strnew_m_charp(a1buf->ptr, ":",
 			     qstr_unquote(get_auth_param(ha->param, "nonce"))->
 			     ptr, ":", a2buf->ptr, NULL);
-	MD5(tmp->ptr, strlen(tmp->ptr), md5);
+	MD5((unsigned char *)tmp->ptr, strlen(tmp->ptr), md5);
 	rd = digest_hex(md5);
     }
 
@@ -3803,7 +3803,7 @@ process_button(struct parsed_tag *tag)
 {
     Str tmp = NULL;
     char *p, *q, *r, *qq = "";
-    int qlen, v;
+    int v;
 
     if (cur_form_id < 0) {
        char *s = "<form_int method=internal action=none>";
@@ -3847,7 +3847,6 @@ process_button(struct parsed_tag *tag)
     }
     if (q) {
        qq = html_quote(q);
-       qlen = strlen(q);
     }
 
     /*    Strcat_charp(tmp, "<pre_int>"); */
@@ -4002,7 +4001,6 @@ void
 process_option(void)
 {
     char begin_char = '[', end_char = ']';
-    int len;
 
     if (cur_select == NULL || cur_option == NULL)
 	return;
@@ -4013,6 +4011,7 @@ process_option(void)
     if (cur_option_label == NULL)
 	cur_option_label = cur_option;
 #ifdef MENU_SELECT
+    int len;
     if (!select_is_multiple) {
 	len = get_Str_strwidth(cur_option_label);
 	if (len > cur_option_maxwidth)
@@ -7601,7 +7600,6 @@ loadGopherSearch0(URLFile *uf, ParsedURL *pu)
 {
     Str tmp;
     char *volatile p, *volatile q;
-    MySignalHandler(*volatile prevtrap) (SIGNAL_ARG) = NULL;
 #ifdef USE_M17N
     wc_ces doc_charset = DocumentCharset;
 #endif
@@ -8166,7 +8164,6 @@ int
 save2tmp(URLFile uf, char *tmpf)
 {
     FILE *ff;
-    int check;
     clen_t linelen = 0, trbyte = 0;
     MySignalHandler(*volatile prevtrap) (SIGNAL_ARG) = NULL;
     static JMP_BUF env_bak;
@@ -8183,8 +8180,8 @@ save2tmp(URLFile uf, char *tmpf)
 	goto _end;
     }
     TRAP_ON;
-    check = 0;
 #ifdef USE_NNTP
+    int check = 0;
     if (uf.scheme == SCM_NEWS) {
 	char c;
 	while (c = UFgetc(&uf), !iseos(uf.stream)) {

image.c

@@ -551,13 +551,12 @@ loadImage(Buffer *buf, int flag)
 	}
 #else /* !DONT_CALL_GC_AFTER_FORK */
 	if ((cache->pid = fork()) == 0) {
-	    Buffer *b;
 	    /*
 	     * setup_child(TRUE, 0, -1);
 	     */
 	    setup_child(FALSE, 0, -1);
 	    image_source = cache->file;
-	    b = loadGeneralFile(cache->url, cache->current, NULL, 0, NULL);
+	    loadGeneralFile(cache->url, cache->current, NULL, 0, NULL);
 	    /* TODO make sure removing this didn't break anything
 	    if (!b || !b->real_type || strncasecmp(b->real_type, "image/", 6))
 		unlink(cache->file);
@@ -734,7 +733,7 @@ getImageSize(ImageCache * cache)
 {
     Str tmp;
     FILE *f;
-    int w = 0, h = 0;
+    unsigned int w = 0, h = 0;
 
     if (!activeImage)
 	return FALSE;
@@ -752,7 +751,7 @@ getImageSize(ImageCache * cache)
     f = popen(tmp->ptr, "r");
     if (!f)
 	return FALSE;
-    while (fscanf(f, "%d %d", &w, &h) < 0) {
+    while (fscanf(f, "%u %u", &w, &h) < 0) {
 	if (feof(f))
 	    break;
     }

indep.c

@@ -821,7 +821,7 @@ growbuf_reserve(struct growbuf *gb, int leastarea)
 }
 
 void
-growbuf_append(struct growbuf *gb, const char *src, int len)
+growbuf_append(struct growbuf *gb, const unsigned char *src, int len)
 {
     growbuf_reserve(gb, gb->length + len);
     memcpy(&gb->ptr[gb->length], src, len);

indep.h

@@ -83,7 +83,7 @@ extern void growbuf_init_without_GC(struct growbuf *gb);
 extern void growbuf_clear(struct growbuf *gb);
 extern Str growbuf_to_Str(struct growbuf *gb);
 extern void growbuf_reserve(struct growbuf *gb, int leastarea);
-extern void growbuf_append(struct growbuf *gb, const char *src, int len);
+extern void growbuf_append(struct growbuf *gb, const unsigned char *src, int len);
 #define GROWBUF_ADD_CHAR(gb,ch) ((((gb)->length>=(gb)->area_size)?growbuf_reserve(gb,(gb)->length+1):(void)0),(void)((gb)->ptr[(gb)->length++] = (ch)))
 
 extern char *w3m_auxbin_dir();

istream.c

@@ -418,7 +418,6 @@ ssl_check_cert_ident(X509 * x, char *hostname)
 	if (alt) {
 	    int n;
 	    GENERAL_NAME *gn;
-	    X509V3_EXT_METHOD *method;
 	    Str seen_dnsname = NULL;
 
 	    n = sk_GENERAL_NAME_num(alt);
@@ -459,7 +458,7 @@ ssl_check_cert_ident(X509 * x, char *hostname)
 			break;
 		}
 	    }
-	    method = X509V3_EXT_get(ex);
+	    X509V3_EXT_get(ex);
 	    sk_GENERAL_NAME_free(alt);
 	    if (i < n)		/* Found a match */
 		match_ident = TRUE;

linein.c

@@ -77,8 +77,6 @@ static Str strCurrentBuf;
 static int use_hist;
 #ifdef USE_M17N
 static void ins_char(Str str);
-#else
-static void ins_char(char c);
 #endif
 
 char *

local.c

@@ -380,17 +380,19 @@ localcgi_post(char *uri, char *qstr, FormList *request, char *referer)
     cgi_dir = mydirname(file);
 #endif
     cgi_basename = mybasename(file);
-    pid = open_pipe_rw(&fr, NULL);
+    pid = open_pipe_rw(&fr, NULL); /* open_pipe_rw() forks */
     /* Don't invoke gc after here, or the program might crash in some platforms */
     if (pid < 0) {
 	if (fw)
 	    fclose(fw);
 	return NULL;
     } else if (pid) {
+	/* parent */
 	if (fw)
 	    fclose(fw);
 	return fr;
     }
+    /* child */
     setup_child(TRUE, 2, fw ? fileno(fw) : -1);
 
     set_cgi_environ(name, file, uri);
@@ -433,4 +435,9 @@ localcgi_post(char *uri, char *qstr, FormList *request, char *referer)
 	    file, cgi_basename, strerror(errno));
     exit(1);
 #endif
+    /*
+     * Suppress compiler warning: function might return no value
+     * This code is never reached.
+     */
+    return NULL;
 }