Fix portability bugs: char values passed to <ctype.h> functions must

be cast to unsigned char.  We have learned this the hard way before.

src/interfaces/ecpg/compatlib/informix.c

@@ -464,7 +464,7 @@ rstrdate(char *str, date * d)
 	for (i=0,j=0; i < 10; i++ )
 	{
 		/* ignore non-digits */
-		if ( isdigit(str[i]) )
+		if ( isdigit((unsigned char) str[i]) )
 		{
 			
 			/* j only increments if it is a digit */
@@ -910,8 +910,8 @@ void
 rupshift(char *str)
 {
 	for (; *str != '\0'; str++)
-		if (islower(*str))
-			*str = toupper(*str);
+		if (islower((unsigned char) *str))
+			*str = toupper((unsigned char) *str);
 	return;
 }
 

src/interfaces/ecpg/pgtypeslib/datetime.c

@@ -405,7 +405,7 @@ PGTYPESdate_defmt_asc(date * d, char *fmt, char *str)
 	reading_digit = 1;
 	for (i = 0; str[i]; i++)
 	{
-		if (!isdigit(str[i]))
+		if (!isdigit((unsigned char) str[i]))
 		{
 			reading_digit = 0;
 			break;
@@ -495,7 +495,7 @@ PGTYPESdate_defmt_asc(date * d, char *fmt, char *str)
 
 		/* convert the whole string to lower case */
 		for (i = 0; str_copy[i]; i++)
-			str_copy[i] = (char) tolower(str_copy[i]);
+			str_copy[i] = (char) tolower((unsigned char) str_copy[i]);
 	}
 
 	/* look for numerical tokens */
@@ -503,14 +503,14 @@ PGTYPESdate_defmt_asc(date * d, char *fmt, char *str)
 	token_count = 0;
 	for (i = 0; i < strlen(str_copy); i++)
 	{
-		if (!isdigit(str_copy[i]) && reading_digit)
+		if (!isdigit((unsigned char) str_copy[i]) && reading_digit)
 		{
 			/* the token is finished */
 			token[token_count][1] = i - 1;
 			reading_digit = 0;
 			token_count++;
 		}
-		else if (isdigit(str_copy[i]) && !reading_digit)
+		else if (isdigit((unsigned char) str_copy[i]) && !reading_digit)
 		{
 			/* we have found a token */
 			token[token_count][0] = i;
@@ -565,7 +565,7 @@ PGTYPESdate_defmt_asc(date * d, char *fmt, char *str)
 		{
 			for (j = 0; j < PGTYPES_DATE_MONTH_MAXLENGTH; j++)
 			{
-				month_lower_tmp[j] = (char) tolower(list[i][j]);
+				month_lower_tmp[j] = (char) tolower((unsigned char) list[i][j]);
 				if (!month_lower_tmp[j])
 				{
 					/* properly terminated */