path: root/src/interfaces/ecpg/preproc/ecpg.header

/* src/interfaces/ecpg/preproc/ecpg.header */

/* Copyright comment */
%{
#include "postgres_fe.h"

#include "preproc_extern.h"
#include "ecpg_config.h"
#include <unistd.h>

/* Location tracking support --- simpler than bison's default */
#define YYLLOC_DEFAULT(Current, Rhs, N) \
	do { \
		if (N)						\
			(Current) = (Rhs)[1];	\
		else						\
			(Current) = (Rhs)[0];	\
	} while (0)

/*
 * The %name-prefix option below will make bison call base_yylex, but we
 * really want it to call filtered_base_yylex (see parser.c).
 */
#define base_yylex filtered_base_yylex

/*
 * This is only here so the string gets into the POT.  Bison uses it
 * internally.
 */
#define bison_gettext_dummy gettext_noop("syntax error")

/*
 * Variables containing simple states.
 */
int struct_level = 0;
int braces_open; /* brace level counter */
char *current_function;
int ecpg_internal_var = 0;
char	*connection = NULL;
char	*input_filename = NULL;

static int	FoundInto = 0;
static int	initializer = 0;
static int	pacounter = 1;
static char	pacounter_buffer[sizeof(int) * CHAR_BIT * 10 / 3]; /* a rough guess at the size we need */
static struct this_type actual_type[STRUCT_DEPTH];
static char *actual_startline[STRUCT_DEPTH];
static int	varchar_counter = 1;
static int	bytea_counter = 1;

/* temporarily store struct members while creating the data structure */
struct ECPGstruct_member *struct_member_list[STRUCT_DEPTH] = { NULL };

/* also store struct type so we can do a sizeof() later */
static char *ECPGstruct_sizeof = NULL;

/* for forward declarations we have to store some data as well */
static char *forward_name = NULL;

struct ECPGtype ecpg_no_indicator = {ECPGt_NO_INDICATOR, NULL, NULL, NULL, {NULL}, 0};
struct variable no_indicator = {"no_indicator", &ecpg_no_indicator, 0, NULL};

static struct ECPGtype ecpg_query = {ECPGt_char_variable, NULL, NULL, NULL, {NULL}, 0};

static void vmmerror(int error_code, enum errortype type, const char *error, va_list ap) pg_attribute_printf(3, 0);

static bool check_declared_list(const char*);

/*
 * Handle parsing errors and warnings
 */
static void
vmmerror(int error_code, enum errortype type, const char *error, va_list ap)
{
	/* localize the error message string */
	error = _(error);

	fprintf(stderr, "%s:%d: ", input_filename, base_yylineno);

	switch(type)
	{
		case ET_WARNING:
			fprintf(stderr, _("WARNING: "));
			break;
		case ET_ERROR:
			fprintf(stderr, _("ERROR: "));
			break;
	}

	vfprintf(stderr, error, ap);

	fprintf(stderr, "\n");

	switch(type)
	{
		case ET_WARNING:
			break;
		case ET_ERROR:
			ret_value = error_code;
			break;
	}
}

void
mmerror(int error_code, enum errortype type, const char *error, ...)
{
	va_list		ap;

	va_start(ap, error);
	vmmerror(error_code, type, error, ap);
	va_end(ap);
}

void
mmfatal(int error_code, const char *error, ...)
{
	va_list		ap;

	va_start(ap, error);
	vmmerror(error_code, ET_ERROR, error, ap);
	va_end(ap);

	if (base_yyin)
		fclose(base_yyin);
	if (base_yyout)
		fclose(base_yyout);

	if (strcmp(output_filename, "-") != 0 && unlink(output_filename) != 0)
		fprintf(stderr, _("could not remove output file \"%s\"\n"), output_filename);
	exit(error_code);
}

/*
 * string concatenation
 */

static char *
cat2_str(char *str1, char *str2)
{
	char * res_str	= (char *)mm_alloc(strlen(str1) + strlen(str2) + 2);

	strcpy(res_str, str1);
	if (strlen(str1) != 0 && strlen(str2) != 0)
		strcat(res_str, " ");
	strcat(res_str, str2);
	free(str1);
	free(str2);
	return res_str;
}

static char *
cat_str(int count, ...)
{
	va_list		args;
	int			i;
	char		*res_str;

	va_start(args, count);

	res_str = va_arg(args, char *);

	/* now add all other strings */
	for (i = 1; i < count; i++)
		res_str = cat2_str(res_str, va_arg(args, char *));

	va_end(args);

	return res_str;
}

static char *
make2_str(char *str1, char *str2)
{
	char * res_str	= (char *)mm_alloc(strlen(str1) + strlen(str2) + 1);

	strcpy(res_str, str1);
	strcat(res_str, str2);
	free(str1);
	free(str2);
	return res_str;
}

static char *
make3_str(char *str1, char *str2, char *str3)
{
	char * res_str	= (char *)mm_alloc(strlen(str1) + strlen(str2) +strlen(str3) + 1);

	strcpy(res_str, str1);
	strcat(res_str, str2);
	strcat(res_str, str3);
	free(str1);
	free(str2);
	free(str3);
	return res_str;
}

/* and the rest */
static char *
make_name(void)
{
	return mm_strdup(base_yytext);
}

static char *
create_questionmarks(char *name, bool array)
{
	struct variable *p = find_variable(name);
	int count;
	char *result = EMPTY;

	/* In case we have a struct, we have to print as many "?" as there are attributes in the struct
	 * An array is only allowed together with an element argument
	 * This is essentially only used for inserts, but using a struct as input parameter is an error anywhere else
	 * so we don't have to worry here. */

	if (p->type->type == ECPGt_struct || (array && p->type->type == ECPGt_array && p->type->u.element->type == ECPGt_struct))
	{
		struct ECPGstruct_member *m;

		if (p->type->type == ECPGt_struct)
			m = p->type->u.members;
		else
			m = p->type->u.element->u.members;

		for (count = 0; m != NULL; m=m->next, count++);
	}
	else
		count = 1;

	for (; count > 0; count --)
	{
		sprintf(pacounter_buffer, "$%d", pacounter++);
		result = cat_str(3, result, mm_strdup(pacounter_buffer), mm_strdup(" , "));
	}

	/* removed the trailing " ," */

	result[strlen(result)-3] = '\0';
	return result;
}

static char *
adjust_outofscope_cursor_vars(struct cursor *cur)
{
	/* Informix accepts DECLARE with variables that are out of scope when OPEN is called.
	 * For instance you can DECLARE a cursor in one function, and OPEN/FETCH/CLOSE
	 * it in another functions. This is very useful for e.g. event-driver programming,
	 * but may also lead to dangerous programming. The limitation when this is allowed
	 * and doesn't cause problems have to be documented, like the allocated variables
	 * must not be realloc()'ed.
	 *
	 * We have to change the variables to our own struct and just store the pointer
	 * instead of the variable. Do it only for local variables, not for globals.
	 */

	char *result = EMPTY;
	int insert;

	for (insert = 1; insert >= 0; insert--)
	{
		struct arguments *list;
		struct arguments *ptr;
		struct arguments *newlist = NULL;
		struct variable *newvar, *newind;

		list = (insert ? cur->argsinsert : cur->argsresult);

		for (ptr = list; ptr != NULL; ptr = ptr->next)
		{
			char var_text[20];
			char *original_var;
			bool skip_set_var = false;
			bool var_ptr = false;

			/* change variable name to "ECPGget_var(<counter>)" */
			original_var = ptr->variable->name;
			sprintf(var_text, "%d))", ecpg_internal_var);

			/* Don't emit ECPGset_var() calls for global variables */
			if (ptr->variable->brace_level == 0)
			{
				newvar = ptr->variable;
				skip_set_var = true;
			}
			else if ((ptr->variable->type->type == ECPGt_char_variable)
					 && (strncmp(ptr->variable->name, "ECPGprepared_statement", strlen("ECPGprepared_statement")) == 0))
			{
				newvar = ptr->variable;
				skip_set_var = true;
			}
			else if ((ptr->variable->type->type != ECPGt_varchar
					  && ptr->variable->type->type != ECPGt_char
					  && ptr->variable->type->type != ECPGt_unsigned_char
					  && ptr->variable->type->type != ECPGt_string
					  && ptr->variable->type->type != ECPGt_bytea)
					 && atoi(ptr->variable->type->size) > 1)
			{
				newvar = new_variable(cat_str(4, mm_strdup("("),
											  mm_strdup(ecpg_type_name(ptr->variable->type->u.element->type)),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text)),
									  ECPGmake_array_type(ECPGmake_simple_type(ptr->variable->type->u.element->type,
																			   mm_strdup("1"),
																			   ptr->variable->type->u.element->counter),
														  ptr->variable->type->size),
									  0);
			}
			else if ((ptr->variable->type->type == ECPGt_varchar
					  || ptr->variable->type->type == ECPGt_char
					  || ptr->variable->type->type == ECPGt_unsigned_char
					  || ptr->variable->type->type == ECPGt_string
					  || ptr->variable->type->type == ECPGt_bytea)
					 && atoi(ptr->variable->type->size) > 1)
			{
				newvar = new_variable(cat_str(4, mm_strdup("("),
											  mm_strdup(ecpg_type_name(ptr->variable->type->type)),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text)),
									  ECPGmake_simple_type(ptr->variable->type->type,
														   ptr->variable->type->size,
														   ptr->variable->type->counter),
									  0);
				if (ptr->variable->type->type == ECPGt_varchar ||
					ptr->variable->type->type == ECPGt_bytea)
					var_ptr = true;
			}
			else if (ptr->variable->type->type == ECPGt_struct
					 || ptr->variable->type->type == ECPGt_union)
			{
				newvar = new_variable(cat_str(5, mm_strdup("(*("),
											  mm_strdup(ptr->variable->type->type_name),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text),
											  mm_strdup(")")),
									  ECPGmake_struct_type(ptr->variable->type->u.members,
														   ptr->variable->type->type,
														   ptr->variable->type->type_name,
														   ptr->variable->type->struct_sizeof),
									  0);
				var_ptr = true;
			}
			else if (ptr->variable->type->type == ECPGt_array)
			{
				if (ptr->variable->type->u.element->type == ECPGt_struct
					|| ptr->variable->type->u.element->type == ECPGt_union)
				{
					newvar = new_variable(cat_str(5, mm_strdup("(*("),
											  mm_strdup(ptr->variable->type->u.element->type_name),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text),
											  mm_strdup(")")),
										  ECPGmake_struct_type(ptr->variable->type->u.element->u.members,
															   ptr->variable->type->u.element->type,
															   ptr->variable->type->u.element->type_name,
															   ptr->variable->type->u.element->struct_sizeof),
										  0);
				}
				else
				{
					newvar = new_variable(cat_str(4, mm_strdup("("),
												  mm_strdup(ecpg_type_name(ptr->variable->type->u.element->type)),
												  mm_strdup(" *)(ECPGget_var("),
												  mm_strdup(var_text)),
										  ECPGmake_array_type(ECPGmake_simple_type(ptr->variable->type->u.element->type,
																				   ptr->variable->type->u.element->size,
																				   ptr->variable->type->u.element->counter),
															  ptr->variable->type->size),
										  0);
					var_ptr = true;
				}
			}
			else
			{
				newvar = new_variable(cat_str(4, mm_strdup("*("),
											  mm_strdup(ecpg_type_name(ptr->variable->type->type)),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text)),
									  ECPGmake_simple_type(ptr->variable->type->type,
														   ptr->variable->type->size,
														   ptr->variable->type->counter),
									  0);
				var_ptr = true;
			}

			/* create call to "ECPGset_var(<counter>, <connection>, <pointer>. <line number>)" */
			if (!skip_set_var)
			{
				sprintf(var_text, "%d, %s", ecpg_internal_var++, var_ptr ? "&(" : "(");
				result = cat_str(5, result, mm_strdup("ECPGset_var("),
								 mm_strdup(var_text), mm_strdup(original_var),
								 mm_strdup("), __LINE__);\n"));
			}

			/* now the indicator if there is one and it's not a global variable */
			if ((ptr->indicator->type->type == ECPGt_NO_INDICATOR) || (ptr->indicator->brace_level == 0))
			{
				newind = ptr->indicator;
			}
			else
			{
				/* change variable name to "ECPGget_var(<counter>)" */
				original_var = ptr->indicator->name;
				sprintf(var_text, "%d))", ecpg_internal_var);
				var_ptr = false;

				if (ptr->indicator->type->type == ECPGt_struct
					|| ptr->indicator->type->type == ECPGt_union)
				{
					newind = new_variable(cat_str(5, mm_strdup("(*("),
											  mm_strdup(ptr->indicator->type->type_name),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text),
											  mm_strdup(")")),
										  ECPGmake_struct_type(ptr->indicator->type->u.members,
															   ptr->indicator->type->type,
															   ptr->indicator->type->type_name,
															   ptr->indicator->type->struct_sizeof),
										  0);
					var_ptr = true;
				}
				else if (ptr->indicator->type->type == ECPGt_array)
				{
					if (ptr->indicator->type->u.element->type == ECPGt_struct
						|| ptr->indicator->type->u.element->type == ECPGt_union)
					{
						newind = new_variable(cat_str(5, mm_strdup("(*("),
											  mm_strdup(ptr->indicator->type->u.element->type_name),
											  mm_strdup(" *)(ECPGget_var("),
											  mm_strdup(var_text),
											  mm_strdup(")")),
											  ECPGmake_struct_type(ptr->indicator->type->u.element->u.members,
																   ptr->indicator->type->u.element->type,
																   ptr->indicator->type->u.element->type_name,
																   ptr->indicator->type->u.element->struct_sizeof),
											  0);
					}
					else
					{
						newind = new_variable(cat_str(4, mm_strdup("("),
													  mm_strdup(ecpg_type_name(ptr->indicator->type->u.element->type)),
													  mm_strdup(" *)(ECPGget_var("), mm_strdup(var_text)),
											  ECPGmake_array_type(ECPGmake_simple_type(ptr->indicator->type->u.element->type,
																					   ptr->indicator->type->u.element->size,
																					   ptr->indicator->type->u.element->counter),
																  ptr->indicator->type->size),
											  0);
						var_ptr = true;
					}
				}
				else if (atoi(ptr->indicator->type->size) > 1)
				{
					newind = new_variable(cat_str(4, mm_strdup("("),
												  mm_strdup(ecpg_type_name(ptr->indicator->type->type)),
												  mm_strdup(" *)(ECPGget_var("),
												  mm_strdup(var_text)),
										  ECPGmake_simple_type(ptr->indicator->type->type,
															   ptr->indicator->type->size,
															   ptr->variable->type->counter),
										  0);
				}
				else
				{
					newind = new_variable(cat_str(4, mm_strdup("*("),
												  mm_strdup(ecpg_type_name(ptr->indicator->type->type)),
												  mm_strdup(" *)(ECPGget_var("),
												  mm_strdup(var_text)),
										  ECPGmake_simple_type(ptr->indicator->type->type,
															   ptr->indicator->type->size,
															   ptr->variable->type->counter),
										  0);
					var_ptr = true;
				}

				/* create call to "ECPGset_var(<counter>, <pointer>. <line number>)" */
				sprintf(var_text, "%d, %s", ecpg_internal_var++, var_ptr ? "&(" : "(");
				result = cat_str(5, result, mm_strdup("ECPGset_var("),
								 mm_strdup(var_text), mm_strdup(original_var),
								 mm_strdup("), __LINE__);\n"));
			}

			add_variable_to_tail(&newlist, newvar, newind);
		}

		if (insert)
			cur->argsinsert_oos = newlist;
		else
			cur->argsresult_oos = newlist;
	}

	return result;
}

/* This tests whether the cursor was declared and opened in the same function. */
#define SAMEFUNC(cur)	\
	((cur->function == NULL) ||		\
	 (cur->function != NULL && strcmp(cur->function, current_function) == 0))

static struct cursor *
add_additional_variables(char *name, bool insert)
{
	struct cursor *ptr;
	struct arguments *p;
	int (* strcmp_fn)(const char *, const char *) = ((name[0] == ':' || name[0] == '"') ? strcmp : pg_strcasecmp);

	for (ptr = cur; ptr != NULL; ptr=ptr->next)
	{
		if (strcmp_fn(ptr->name, name) == 0)
			break;
	}

	if (ptr == NULL)
	{
		mmerror(PARSE_ERROR, ET_ERROR, "cursor \"%s\" does not exist", name);
		return NULL;
	}

	if (insert)
	{
		/* add all those input variables that were given earlier
		 * note that we have to append here but have to keep the existing order */
		for (p = (SAMEFUNC(ptr) ? ptr->argsinsert : ptr->argsinsert_oos); p; p = p->next)
			add_variable_to_tail(&argsinsert, p->variable, p->indicator);
	}

	/* add all those output variables that were given earlier */
	for (p = (SAMEFUNC(ptr) ? ptr->argsresult : ptr->argsresult_oos); p; p = p->next)
		add_variable_to_tail(&argsresult, p->variable, p->indicator);

	return ptr;
}

static void
add_typedef(char *name, char *dimension, char *length, enum ECPGttype type_enum,
			char *type_dimension, char *type_index, int initializer, int array)
{
	/* add entry to list */
	struct typedefs *ptr, *this;

	if ((type_enum == ECPGt_struct ||
		 type_enum == ECPGt_union) &&
		initializer == 1)
		mmerror(PARSE_ERROR, ET_ERROR, "initializer not allowed in type definition");
	else if (INFORMIX_MODE && strcmp(name, "string") == 0)
		mmerror(PARSE_ERROR, ET_ERROR, "type name \"string\" is reserved in Informix mode");
	else
	{
		for (ptr = types; ptr != NULL; ptr = ptr->next)
		{
			if (strcmp(name, ptr->name) == 0)
				/* re-definition is a bug */
				mmerror(PARSE_ERROR, ET_ERROR, "type \"%s\" is already defined", name);
		}
		adjust_array(type_enum, &dimension, &length, type_dimension, type_index, array, true);

		this = (struct typedefs *) mm_alloc(sizeof(struct typedefs));

		/* initial definition */
		this->next = types;
		this->name = name;
		this->brace_level = braces_open;
		this->type = (struct this_type *) mm_alloc(sizeof(struct this_type));
		this->type->type_enum = type_enum;
		this->type->type_str = mm_strdup(name);
		this->type->type_dimension = dimension; /* dimension of array */
		this->type->type_index = length;	/* length of string */
		this->type->type_sizeof = ECPGstruct_sizeof;
		this->struct_member_list = (type_enum == ECPGt_struct || type_enum == ECPGt_union) ?
		ECPGstruct_member_dup(struct_member_list[struct_level]) : NULL;

		if (type_enum != ECPGt_varchar &&
			type_enum != ECPGt_bytea &&
			type_enum != ECPGt_char &&
			type_enum != ECPGt_unsigned_char &&
			type_enum != ECPGt_string &&
			atoi(this->type->type_index) >= 0)
			mmerror(PARSE_ERROR, ET_ERROR, "multidimensional arrays for simple data types are not supported");

		types = this;
	}
}

/*
 * check an SQL identifier is declared or not.
 * If it is already declared, the global variable
 * connection will be changed to the related connection.
 */
static bool
check_declared_list(const char *name)
{
	struct declared_list *ptr = NULL;
	for (ptr = g_declared_list; ptr != NULL; ptr = ptr -> next)
	{
		if (!ptr->connection)
			continue;
		if (strcmp(name, ptr -> name) == 0)
		{
			if (connection && strcmp(ptr->connection, connection) != 0)
				mmerror(PARSE_ERROR, ET_WARNING, "connection %s is overwritten with %s by DECLARE statement %s", connection, ptr->connection, name);
			connection = mm_strdup(ptr -> connection);
			return true;
		}
	}
	return false;
}
%}

%expect 0
%name-prefix="base_yy"
%locations

%union {
	double	dval;
	char	*str;
	int		ival;
	struct	when		action;
	struct	index		index;
	int		tagname;
	struct	this_type	type;
	enum	ECPGttype	type_enum;
	enum	ECPGdtype	dtype_enum;
	struct	fetch_desc	descriptor;
	struct  su_symbol	struct_union;
	struct	prep		prep;
	struct	exec		exec;
	struct describe		describe;
}