Address compiler warnings and compaints from Sanitizers (revealed

by Clang-12 from Xcode-12.5 on macOS Big Sur 11.4)

skeletons/OCTET_STRING_print.c

@@ -26,7 +26,7 @@ OCTET_STRING_print(const asn_TYPE_descriptor_t *td, const void *sptr,
      * Dump the contents of the buffer in hexadecimal.
      */
     buf = st->buf;
-    end = buf + st->size;
+    end = (buf == NULL)? NULL : buf + st->size;
     for(i = 0; buf < end; buf++, i++) {
         if(!(i % 16) && (i || st->size > 16)) {
             if(cb(scratch, p - scratch, app_key) < 0)

skeletons/OCTET_STRING_xer.c

@@ -286,7 +286,7 @@ static ssize_t OCTET_STRING__convert_hexadecimal(void *sptr, const void *chunk_b
 static ssize_t OCTET_STRING__convert_binary(void *sptr, const void *chunk_buf, size_t chunk_size, int have_more) {
     BIT_STRING_t *st = (BIT_STRING_t *)sptr;
     const char *p = (const char *)chunk_buf;
-    const char *pend = p + chunk_size;
+    const char *pend = (p == NULL)? NULL : p + chunk_size;
     int bits_unused = st->bits_unused & 0x7;
     uint8_t *buf;
 

skeletons/UTF8String.c

@@ -151,10 +151,10 @@ UTF8String_constraint(const asn_TYPE_descriptor_t *td, const void *sptr,
 
 static ssize_t
 UTF8String__process(const UTF8String_t *st, uint32_t *dst, size_t dstlen) {
-	size_t length;
-	uint8_t *buf = st->buf;
-	uint8_t *end = buf + st->size;
-	uint32_t *dstend = dst + dstlen;
+	size_t length = 0;
+	uint8_t *buf = (st == NULL)? NULL : st->buf;
+	uint8_t *end = (buf == NULL)? NULL : buf + st->size;
+	uint32_t *dstend = (dst == NULL)? NULL : dst + dstlen;
 
 	for(length = 0; buf < end; length++) {
 		int ch = *buf;

skeletons/asn_codecs_prim_xer.c

@@ -92,7 +92,7 @@ xer_decode__primitive_body(void *key, const void *chunk_buf, size_t chunk_size,
     }
 
     lead_wsp_size = xer_whitespace_span(chunk_buf, chunk_size);
-    chunk_buf = (const char *)chunk_buf + lead_wsp_size;
+    chunk_buf  += lead_wsp_size;
     chunk_size -= lead_wsp_size;
 
     bret = arg->prim_body_decoder(arg->type_descriptor,

skeletons/uper_opentype.c

@@ -94,7 +94,7 @@ uper_open_type_get_simple(const asn_codec_ctx_t *ctx,
 			}
 			buf = ptr;
 		}
-		if(per_get_many_bits(pd, buf + bufLen, 0, chunk_bytes << 3)) {
+		if(per_get_many_bits(pd, (buf == NULL)? NULL : buf + bufLen, 0, chunk_bytes << 3)) {
 			FREEMEM(buf);
 			ASN__DECODE_STARVED;
 		}

skeletons/xer_decoder.c

@@ -323,7 +323,7 @@ xer_decode_general(const asn_codec_ctx_t *opt_codec_ctx,
 size_t
 xer_whitespace_span(const void *chunk_buf, size_t chunk_size) {
 	const char *p = (const char *)chunk_buf;
-	const char *pend = p + chunk_size;
+	const char *pend = (p == NULL)? NULL : p + chunk_size;
 
 	for(; p < pend; p++) {
 		switch(*p) {

tests/tests-asn1c-compiler/check-parsing.sh

@@ -3,6 +3,7 @@
 # Test diff(1) capabilities
 diff -a . . 2>/dev/null && diffArgs="-a"		# Assume text files
 diff -u . . 2>/dev/null && diffArgs="$diffArgs -u"	# Unified diff output
+diff -w . . 2>/dev/null && diffArgs="$diffArgs -w"	# Number of whitespaces not relevant
 
 finalExitCode=0
 

tests/tests-c-compiler/data-126/data-126-01.in

 <PDU>
-	<str-m></str-m>
+    <str-m></str-m>
 </PDU>

tests/tests-c-compiler/data-126/data-126-02-P.in

 <PDU>
-	<str-m></str-m>
+    <str-m></str-m>
 </PDU>

tests/tests-c-compiler/data-126/data-126-14.in

 <PDU>
-	<str-m>ab</str-m>
-	<singl><opt-z></opt-z></singl>
+    <str-m>ab</str-m>
+    <singl>
+        <opt-z></opt-z>
+    </singl>
 </PDU>

tests/tests-c-compiler/data-126/data-126-15.in

 <PDU>
-	<str-m></str-m>
-	<singl><opt-z>z</opt-z></singl>
+    <str-m></str-m>
+    <singl>
+        <opt-z>z</opt-z>
+    </singl>
 </PDU>

tests/tests-c-compiler/data-126/data-126-16.in

 <PDU>
-	<str-m>a</str-m>
-	<singl><opt-z>z</opt-z></singl>
+    <str-m>a</str-m>
+    <singl>
+        <opt-z>z</opt-z>
+    </singl>
 </PDU>

tests/tests-c-compiler/data-126/data-126-20.in

 <PDU>
-	<str-m>some long string spanning multiple bytes</str-m>
-	<singl><opt-z>zzz-zzz-zzz-zzz</opt-z></singl>
-	<pdu-2>
-		<ext0>13</ext0>
-	</pdu-2>
+    <str-m>some long string spanning multiple bytes</str-m>
+    <singl>
+        <opt-z>zzz-zzz-zzz-zzz</opt-z>
+    </singl>
+    <pdu-2>
+        <ext0>13</ext0>
+    </pdu-2>
 </PDU>

tests/tests-c-compiler/data-126/data-126-21.in

 <PDU>
-	<str-m></str-m>
-	<singl><opt-z></opt-z></singl>
-	<pdu-2>
-		<ext0>0</ext0>
-	</pdu-2>
+    <str-m></str-m>
+    <singl>
+        <opt-z></opt-z>
+    </singl>
+    <pdu-2>
+        <ext0>0</ext0>
+    </pdu-2>
 </PDU>