Fix bug #948: make HIGH/LOW-VALUE sensitive to ASCII/EBCDIC program c…

…ollating sequence

cobc/ChangeLog

@@ -1,4 +1,20 @@
 
+2024-02-26  David Declerck <[email protected]>
+
+	BUG #948: comparison with HIGH-VALUE in presence of collating sequences
+	* typeck.c: replace cob_refer_ascii and cob_refer_ebcdic by
+	  ebcdic_to_ascii and ascii_to_ebcdic; add low_value and
+	  high_value global variables to hold the low and high values
+	  used by the program collating sequence; add load_collating_table
+	  to load the tables; modify cb_validate_collating to call
+	  load_collating_table and set low_value and high_value;
+	  modify validate_alphabet to use the new tables
+	* cobc.h: export the new symbols defined in typeck.c
+	* codegen.c: replace hard-coded 0 and 255 / 0xff contants
+	  with low_value and high_value where appropriate; adjust the
+	  output_collating_tables function to use the tables and functions
+	  defined in typeck.c
+
 2024-01-25  David Declerck <[email protected]>
 
 	FR #459: support COLLATING SEQUENCE clause on SELECT / INDEXED files

cobc/cobc.h

@@ -620,6 +620,11 @@ extern int		yyparse (void);
 /* typeck.c */
 extern size_t		suppress_warn;	/* no warnings for internal generated stuff */
 
+extern cob_u8_t ebcdic_to_ascii[256];
+extern cob_u8_t ascii_to_ebcdic[256];
+
+void load_collating_tables (void);
+
 /* error.c */
 #define CB_MSG_STYLE_GCC	0
 #define CB_MSG_STYLE_MSC	1U

cobc/codegen.c

@@ -2512,23 +2512,23 @@ static void
 output_low_value (void)
 {
 	if (gen_figurative & CB_NEED_LOW) {
-		output ("static cob_field cob_all_low\t= ");
-		output ("{1, ");
-		output ("(cob_u8_ptr)\"\\0\", ");
-		output ("&cob_all_attr};");
-		output_newline ();
+		output_local ("static cob_field cob_all_low\t= ");
+		output_local ("{1, ");
+		output_local ("(cob_u8_ptr)\"\\x%02x\", ", current_prog->low_value);
+		output_local ("&cob_all_attr};");
+		output_local ("\n");
 	}
 }
 
 static void
 output_high_value (void)
 {
 	if (gen_figurative & CB_NEED_HIGH) {
-		output ("static cob_field cob_all_high\t= ");
-		output ("{1, ");
-		output ("(cob_u8_ptr)\"\\xff\", ");
-		output ("&cob_all_attr};");
-		output_newline ();
+		output_local ("static cob_field cob_all_high\t= ");
+		output_local ("{1, ");
+		output_local ("(cob_u8_ptr)\"\\x%02x\", ", current_prog->high_value);
+		output_local ("&cob_all_attr};");
+		output_local ("\n");
 	}
 }
 
@@ -2612,8 +2612,6 @@ output_literals_figuratives_and_constants (void)
 
 	if (gen_figurative) {
 		output_newline ();
-		output_low_value ();
-		output_high_value ();
 		output_quote ();
 		output_space ();
 		output_zero ();
@@ -2651,16 +2649,10 @@ output_colseq_table_field (const char * field_name, const char * table_name)
 static void
 output_collating_tables (void)
 {
-	cob_u8_t ebcdic_to_ascii[256];
-	cob_u8_t ascii_to_ebcdic[256];
 
 	/* Load the collating tables if needed */
 	if (gen_ascii_ebcdic || gen_ebcdic_ascii) {
-		if (cob_load_collation (cb_ebcdic_table,
-					gen_ebcdic_ascii ? ebcdic_to_ascii : NULL,
-					gen_ascii_ebcdic ? ascii_to_ebcdic : NULL) < 0) {
-			cobc_err_exit (_("invalid parameter: %s"), "-febcdic-table");
-		}
+		load_collating_tables ();
 	}
 
 	if (gen_native) {
@@ -4274,9 +4266,9 @@ output_funcall_typed (struct cb_funcall *p, const char type)
 		} else if (p->argv[1] == cb_zero) {
 			output (") - '0')");
 		} else if (p->argv[1] == cb_low) {
-			output ("))");
+			output (") - %d)", current_prog->low_value);
 		} else if (p->argv[1] == cb_high) {
-			output (") - 255)");
+			output (") - %d)", current_prog->high_value);
 		} else if (CB_LITERAL_P (p->argv[1])) {
 			output_char (") - ", CB_LITERAL (p->argv[1])->data[0], ")");
 		} else {
@@ -5007,10 +4999,10 @@ output_initialize_to_value (struct cb_field *f, cb_tree x,
 			output_figurative (x, f, ' ', init_occurs);
 			return;
 		} else if (value == cb_low) {
-			output_figurative (x, f, 0, init_occurs);
+			output_figurative (x, f, current_prog->low_value, init_occurs);
 			return;
 		} else if (value == cb_high) {
-			output_figurative (x, f, 255, init_occurs);
+			output_figurative (x, f, current_prog->high_value, init_occurs);
 			return;
 		} else if (value == cb_quote) {
 			if (cb_flag_apostrophe) {
@@ -10723,9 +10715,9 @@ output_class_name_definition (struct cb_class_name *p)
 			} else if (x == cb_null) {
 				vals[0] = 1;
 			} else if (x == cb_low) {
-				vals[0] = 1;
+				vals[current_prog->low_value] = 1;
 			} else if (x == cb_high) {
-				vals[255] = 1;
+				vals[current_prog->high_value] = 1;
 			} else {
 				size = CB_LITERAL (x)->size;
 				data = CB_LITERAL (x)->data;
@@ -11270,6 +11262,7 @@ output_module_init_function (struct cb_program *prog)
 	output_line ("module->decimal_point = '%c';", prog->decimal_point);
 	output_line ("module->currency_symbol = '%c';", prog->currency_symbol);
 	output_line ("module->numeric_separator = '%c';", prog->numeric_separator);
+	output_line ("module->low_value = '\\x%02x';", prog->low_value);
 	output_line ("module->flag_filename_mapping = %d;", cb_filename_mapping);
 	output_line ("module->flag_binary_truncate = %d;", cb_binary_truncate);
 	output_line ("module->flag_pretty_display = %d;", cb_pretty_display);
@@ -14014,6 +14007,12 @@ codegen_internal (struct cb_program *prog, const int subsequent_call)
 			output_local ("\n");
 		}
 	}
+
+	/* Low and high values */
+	if (gen_figurative) {
+		output_low_value ();
+		output_high_value ();
+	}
 }
 
 void

cobc/tree.c

@@ -2193,6 +2193,8 @@ cb_build_program (struct cb_program *last_program, const int nest_level)
 	p->decimal_point = '.';
 	p->currency_symbol = '$';
 	p->numeric_separator = ',';
+	p->low_value = '\0';
+	p->high_value = '\xff';
 	if (cb_call_extfh) {
 		p->extfh = cobc_parse_strdup (cb_call_extfh);
 	}

cobc/tree.h

@@ -1901,6 +1901,8 @@ struct cb_program {
 	unsigned char	decimal_point;			/* '.' or ',' */
 	unsigned char	currency_symbol;		/* '$' or user-specified */
 	unsigned char	numeric_separator;		/* ',' or '.' */
+	cob_u8_t	low_value;			/* Low-value for this program */
+	cob_u8_t	high_value;			/* High-value for this program */
 	enum cob_module_type	prog_type;			/* Program type (program = 0, function = 1) */
 	cb_tree			entry_convention;	/* ENTRY convention / PROCEDURE convention */
 	struct literal_list	*decimal_constants;

cobc/typeck.c

@@ -196,79 +196,10 @@ static const unsigned char	expr_prio[256] = {
 static unsigned char		expr_prio[256];
 #endif
 
-#ifdef	COB_EBCDIC_MACHINE
-/* EBCDIC referring to ASCII */
-static const unsigned char	cob_refer_ascii[256] = {
-	0x00, 0x01, 0x02, 0x03, 0x37, 0x2D, 0x2E, 0x2F,
-	0x16, 0x05, 0x25, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
-	0x10, 0x11, 0x12, 0x13, 0x3C, 0x3D, 0x32, 0x26,
-	0x18, 0x19, 0x3F, 0x27, 0x1C, 0x1D, 0x1E, 0x1F,
-	0x40, 0x5A, 0x7F, 0x7B, 0x5B, 0x6C, 0x50, 0x7D,
-	0x4D, 0x5D, 0x5C, 0x4E, 0x6B, 0x60, 0x4B, 0x61,
-	0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
-	0xF8, 0xF9, 0x7A, 0x5E, 0x4C, 0x7E, 0x6E, 0x6F,
-	0x7C, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
-	0xC8, 0xC9, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6,
-	0xD7, 0xD8, 0xD9, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6,
-	0xE7, 0xE8, 0xE9, 0xAD, 0xE0, 0xBD, 0x5F, 0x6D,
-	0x79, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
-	0x88, 0x89, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
-	0x97, 0x98, 0x99, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6,
-	0xA7, 0xA8, 0xA9, 0xC0, 0x6A, 0xD0, 0xA1, 0x07,
-	0x68, 0xDC, 0x51, 0x42, 0x43, 0x44, 0x47, 0x48,
-	0x52, 0x53, 0x54, 0x57, 0x56, 0x58, 0x63, 0x67,
-	0x71, 0x9C, 0x9E, 0xCB, 0xCC, 0xCD, 0xDB, 0xDD,
-	0xDF, 0xEC, 0xFC, 0xB0, 0xB1, 0xB2, 0x3E, 0xB4,
-	0x45, 0x55, 0xCE, 0xDE, 0x49, 0x69, 0x9A, 0x9B,
-	0xAB, 0x9F, 0xBA, 0xB8, 0xB7, 0xAA, 0x8A, 0x8B,
-	0xB6, 0xB5, 0x62, 0x4F, 0x64, 0x65, 0x66, 0x20,
-	0x21, 0x22, 0x70, 0x23, 0x72, 0x73, 0x74, 0xBE,
-	0x76, 0x77, 0x78, 0x80, 0x24, 0x15, 0x8C, 0x8D,
-	0x8E, 0x41, 0x06, 0x17, 0x28, 0x29, 0x9D, 0x2A,
-	0x2B, 0x2C, 0x09, 0x0A, 0xAC, 0x4A, 0xAE, 0xAF,
-	0x1B, 0x30, 0x31, 0xFA, 0x1A, 0x33, 0x34, 0x35,
-	0x36, 0x59, 0x08, 0x38, 0xBC, 0x39, 0xA0, 0xBF,
-	0xCA, 0x3A, 0xFE, 0x3B, 0x04, 0xCF, 0xDA, 0x14,
-	0xE1, 0x8F, 0x46, 0x75, 0xFD, 0xEB, 0xEE, 0xED,
-	0x90, 0xEF, 0xB3, 0xFB, 0xB9, 0xEA, 0xBB, 0xFF
-};
-#else
-/* ASCII referring to EBCDIC */
-static const unsigned char	cob_refer_ebcdic[256] = {
-	0x00, 0x01, 0x02, 0x03, 0xEC, 0x09, 0xCA, 0x7F,
-	0xE2, 0xD2, 0xD3, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
-	0x10, 0x11, 0x12, 0x13, 0xEF, 0xC5, 0x08, 0xCB,
-	0x18, 0x19, 0xDC, 0xD8, 0x1C, 0x1D, 0x1E, 0x1F,
-	0xB7, 0xB8, 0xB9, 0xBB, 0xC4, 0x0A, 0x17, 0x1B,
-	0xCC, 0xCD, 0xCF, 0xD0, 0xD1, 0x05, 0x06, 0x07,
-	0xD9, 0xDA, 0x16, 0xDD, 0xDE, 0xDF, 0xE0, 0x04,
-	0xE3, 0xE5, 0xE9, 0xEB, 0x14, 0x15, 0x9E, 0x1A,
-	0x20, 0xC9, 0x83, 0x84, 0x85, 0xA0, 0xF2, 0x86,
-	0x87, 0xA4, 0xD5, 0x2E, 0x3C, 0x28, 0x2B, 0xB3,
-	0x26, 0x82, 0x88, 0x89, 0x8A, 0xA1, 0x8C, 0x8B,
-	0x8D, 0xE1, 0x21, 0x24, 0x2A, 0x29, 0x3B, 0x5E,
-	0x2D, 0x2F, 0xB2, 0x8E, 0xB4, 0xB5, 0xB6, 0x8F,
-	0x80, 0xA5, 0x7C, 0x2C, 0x25, 0x5F, 0x3E, 0x3F,
-	0xBA, 0x90, 0xBC, 0xBD, 0xBE, 0xF3, 0xC0, 0xC1,
-	0xC2, 0x60, 0x3A, 0x23, 0x40, 0x27, 0x3D, 0x22,
-	0xC3, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
-	0x68, 0x69, 0xAE, 0xAF, 0xC6, 0xC7, 0xC8, 0xF1,
-	0xF8, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70,
-	0x71, 0x72, 0xA6, 0xA7, 0x91, 0xCE, 0x92, 0xA9,
-	0xE6, 0x7E, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
-	0x79, 0x7A, 0xAD, 0xA8, 0xD4, 0x5B, 0xD6, 0xD7,
-	0x9B, 0x9C, 0x9D, 0xFA, 0x9F, 0xB1, 0xB0, 0xAC,
-	0xAB, 0xFC, 0xAA, 0xFE, 0xE4, 0x5D, 0xBF, 0xE7,
-	0x7B, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
-	0x48, 0x49, 0xE8, 0x93, 0x94, 0x95, 0xA2, 0xED,
-	0x7D, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F, 0x50,
-	0x51, 0x52, 0xEE, 0x96, 0x81, 0x97, 0xA3, 0x98,
-	0x5C, 0xF0, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
-	0x59, 0x5A, 0xFD, 0xF5, 0x99, 0xF7, 0xF6, 0xF9,
-	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
-	0x38, 0x39, 0xDB, 0xFB, 0x9A, 0xF4, 0xEA, 0xFF
-};
-#endif
+/* ASCII/EBCDIC translation tables  */
+
+cob_u8_t ebcdic_to_ascii[256];
+cob_u8_t ascii_to_ebcdic[256];
 
 /* System routines */
 
@@ -3804,8 +3735,21 @@ get_value (cb_tree x)
 	}
 }
 
+void
+load_collating_tables (void)
+{
+	static int coltab_loaded = 0;
+	if (coltab_loaded) {
+		return;
+	}
+	if (cob_load_collation (cb_ebcdic_table, ebcdic_to_ascii, ascii_to_ebcdic) < 0) {
+		cobc_err_exit (_("invalid parameter: %s"), "-febcdic-table");
+	}
+	coltab_loaded = 1;
+}
+
 static int
-cb_validate_collating (cb_tree collating_sequence)
+cb_validate_collating (struct cb_program *prog, cb_tree collating_sequence)
 {
 	cb_tree		x;
 
@@ -3819,17 +3763,33 @@ cb_validate_collating (cb_tree collating_sequence)
 			    cb_name (collating_sequence));
 		return 1;
 	}
+
+#ifdef COB_EBCDIC_MACHINE
+	if (CB_ALPHABET_NAME (x)->alphabet_type == CB_ALPHABET_ASCII) {
+		load_collating_tables ();
+                prog->low_value = ascii_to_ebcdic[0x00];
+                prog->high_value = ascii_to_ebcdic[0xff];
+	}
+#else
+	if (CB_ALPHABET_NAME (x)->alphabet_type == CB_ALPHABET_EBCDIC) {
+		load_collating_tables ();
+                prog->low_value = ebcdic_to_ascii[0x00];
+                prog->high_value = ebcdic_to_ascii[0xff];
+	}
+#endif
+
 	if (CB_ALPHABET_NAME (x)->alphabet_type != CB_ALPHABET_CUSTOM) {
 		return 0;
 	}
 	if (CB_ALPHABET_NAME (x)->low_val_char) {
 		cb_low = cb_build_alphanumeric_literal ("\0", (size_t)1);
-		CB_LITERAL(cb_low)->data[0] = (unsigned char)CB_ALPHABET_NAME (x)->low_val_char;
+		CB_LITERAL(cb_low)->data[0] = prog->low_value = (unsigned char)CB_ALPHABET_NAME (x)->low_val_char;
 		CB_LITERAL(cb_low)->all = 1;
 	}
+
 	if (CB_ALPHABET_NAME (x)->high_val_char != 255){
 		cb_high = cb_build_alphanumeric_literal ("\0", (size_t)1);
-		CB_LITERAL(cb_high)->data[0] = (unsigned char)CB_ALPHABET_NAME (x)->high_val_char;
+		CB_LITERAL(cb_high)->data[0] = prog->high_value = (unsigned char)CB_ALPHABET_NAME (x)->high_val_char;
 		CB_LITERAL(cb_high)->all = 1;
 	}
 	return 0;
@@ -3854,8 +3814,9 @@ validate_alphabet (cb_tree alphabet)
 	if (ap->alphabet_type == CB_ALPHABET_ASCII) {
 		for (n = 0; n < 256; n++) {
 #ifdef	COB_EBCDIC_MACHINE
-			ap->values[n] = (int)cob_refer_ascii[n];
-			ap->alphachr[n] = (int)cob_refer_ascii[n];
+			load_collating_tables ();
+			ap->values[n] = (int)ascii_to_ebcdic[n];
+			ap->alphachr[n] = (int)ascii_to_ebcdic[n];
 #else
 			ap->values[n] = n;
 			ap->alphachr[n] = n;
@@ -3871,8 +3832,9 @@ validate_alphabet (cb_tree alphabet)
 			ap->values[n] = n;
 			ap->alphachr[n] = n;
 #else
-			ap->values[n] = (int)cob_refer_ebcdic[n];
-			ap->alphachr[n] = (int)cob_refer_ebcdic[n];
+			load_collating_tables ();
+			ap->values[n] = (int)ebcdic_to_ascii[n];
+			ap->alphachr[n] = (int)ebcdic_to_ascii[n];
 #endif
 		}
 		return;
@@ -4241,10 +4203,10 @@ cb_validate_program_environment (struct cb_program *prog)
 	}
 
 	/* Resolve the program collating sequences */
-	if (cb_validate_collating (prog->collating_sequence)) {
+	if (cb_validate_collating (prog, prog->collating_sequence)) {
 		prog->collating_sequence = NULL;
 	};
-	if (cb_validate_collating (prog->collating_sequence_n)) {
+	if (cb_validate_collating (prog, prog->collating_sequence_n)) {
 		prog->collating_sequence_n = NULL;
 	};
 

libcob/common.h

@@ -1337,6 +1337,8 @@ typedef struct __cob_module {
 	const char		*paragraph_name;		/* name of current active pagagraph */
 	enum cob_statement	statement;		/* statement currently executed */
 
+	unsigned char		low_value;		/* Low-value of the program collating sequence */
+
 } cob_module;
 
 

libcob/strings.c

@@ -424,9 +424,11 @@ inspect_common (cob_field *f1, cob_field *f2, const enum inspect_type type)
 	}
 
 	if (unlikely (!f1)) {
+		str_cob_low.data = &COB_MODULE_PTR->low_value;
 		f1 = &str_cob_low;
 	}
 	if (unlikely (!f2)) {
+		str_cob_low.data = &COB_MODULE_PTR->low_value;
 		f2 = &str_cob_low;
 	}
 
@@ -650,9 +652,11 @@ cob_inspect_converting (const cob_field *f1, const cob_field *f2)
 	}
 
 	if (unlikely (!f1)) {
+		str_cob_low.data = &COB_MODULE_PTR->low_value;
 		f1 = &str_cob_low;
 	}
 	if (unlikely (!f2)) {
+		str_cob_low.data = &COB_MODULE_PTR->low_value;
 		f2 = &str_cob_low;
 	}
 	if (f1->size != f2->size) {