copy mnemonic in the same loop of searching for mnemonic/opstring delimiter

cs.c

@@ -258,6 +258,7 @@ static void fill_insn(struct cs_struct *handle, cs_insn *insn, char *buffer, MCI
 #ifndef CAPSTONE_DIET
 	char *sp;
 #endif
+	char *mnem;
 
 	if (handle->detail) {
 		// avoiding copy insn->detail
@@ -294,6 +295,7 @@ static void fill_insn(struct cs_struct *handle, cs_insn *insn, char *buffer, MCI
 	// fill in mnemonic & operands
 	// find first space or tab
 	sp = buffer;
+	mnem = insn->mnemonic;
 	if (mci->x86_prefix[0]) {
 		for (sp = buffer; *sp; sp++) {
 			//if (*sp == ' '||*sp == '\t')
@@ -301,14 +303,23 @@ static void fill_insn(struct cs_struct *handle, cs_insn *insn, char *buffer, MCI
 				break;
 			if (*sp == '|')	// lock|rep prefix for x86
 				*sp = ' ';
+			// copy to @mnemonic
+			*mnem = *sp;
+			mnem++;
 		}
 	} else {
 		for (sp = buffer; *sp; sp++) {
 			if (*sp == ' '||*sp == '\t')
 				break;
+			// copy to @mnemonic
+			*mnem = *sp;
+			mnem++;
 		}
 	}
 
+	*mnem = '\0';
+
+	// copy @op_str
 	if (*sp) {
 		*sp = '\0';
 		// find the next non-space char
@@ -318,8 +329,6 @@ static void fill_insn(struct cs_struct *handle, cs_insn *insn, char *buffer, MCI
 		insn->op_str[sizeof(insn->op_str) - 1] = '\0';
 	} else
 		insn->op_str[0] = '\0';
-
-	strcpy(insn->mnemonic, buffer);
 #endif
 }