--- /dev/null
+/* This file is part of the Project Athena Zephyr Notification System.
+ * It is one of the source files comprising zwgc, the Zephyr WindowGram
+ * client.
+ *
+ * Created by: Marc Horowitz <marc@athena.mit.edu>
+ *
+ * $Id: variables.c,v 1.5 1999/01/22 23:20:42 ghudson Exp $
+ *
+ * Copyright (c) 1989 by the Massachusetts Institute of Technology.
+ * For copying and distribution information, see the file
+ * "mit-copyright.h".
+ */
+
+#include <sysdep.h>
+
+#if (!defined(lint) && !defined(SABER))
+static const char rcsid_variables_c[] = "$Id: variables.c,v 1.5 1999/01/22 23:20:42 ghudson Exp $";
+#endif
+
+#include <zephyr/mit-copyright.h>
+
+/****************************************************************************/
+/* */
+/* Module containing code to deal with description langauge variables: */
+/* */
+/****************************************************************************/
+
+#include "new_memory.h"
+#include "notice.h"
+#include "string_dictionary_aux.h"
+#include "variables.h"
+
+/*
+ * fields_data[_length] - these point to the field data that the number
+ * variables were last set to using
+ * var_set_number_variables_to_fields.
+ */
+
+static char *fields_data;
+static int fields_data_length = 0;
+
+/*
+ * [non_]number_variable_dict - contains the values of all the [non-]number
+ * variables that have been set since the last
+ * var_clear_all_variables call or (for numbers
+ * only) var_set_number_variables_to_fields call.
+ */
+
+static string_dictionary non_number_variable_dict = NULL;
+static string_dictionary number_variable_dict = NULL;
+
+/*
+ * Internal Routine:
+ *
+ * int is_digits(string text)
+ * Effects: Returns true iff text matches [0-9]*. ("" matches...)
+ */
+
+static int is_digits(text)
+ string text;
+{
+ for (; *text; text++)
+ if (!isdigit(*text))
+ return(0);
+
+ return(1);
+}
+
+/*
+ * Internal Routine:
+ *
+ * int is_number_variable(string text)
+ * Effects: Returns true iff text matches [0-9]+.
+ */
+
+#define is_number_variable(x) (isdigit(*(x)) && is_digits((x)))
+
+/*
+ * void var_clear_all_variables()
+ * Requires: This routine must be called before any other
+ * var module routine is called.
+ * Modifies: All description language variables
+ * Effects: Sets all description langauge variables to "".
+ */
+
+void var_clear_all_variables()
+{
+ if (non_number_variable_dict) {
+ string_dictionary_SafeDestroy(non_number_variable_dict);
+ string_dictionary_SafeDestroy(number_variable_dict);
+ }
+
+ non_number_variable_dict = string_dictionary_Create(101);
+ number_variable_dict = string_dictionary_Create(11);
+ fields_data_length = 0;
+}
+
+/*
+ * string var_get_variable(string name)
+ * Requires: var_clear_all_variables has been called
+ * Effects: Returns the value of the description langauge variable
+ * named name. The returned string is read-only and is
+ * guarenteed to last only until the next var module
+ * call. DO NOT FREE THIS STRING.
+ */
+
+string var_get_variable(name)
+ string name;
+{
+ char *result;
+ int field_to_get;
+ static string last_get_field_call_result = NULL;
+
+ if (is_number_variable(name)) {
+ if (result = string_dictionary_Fetch(number_variable_dict, name))
+ return(result);
+
+ /*
+ * Convert name to an integer avoiding overflow:
+ */
+ while (*name=='0')
+ name++;
+ if (strlen(name)>12)
+ field_to_get = 0; /* no way we'll have > 1 trillian fields... */
+ else
+ field_to_get = atoi(name);
+
+ if (!field_to_get)
+ return("");
+ if (last_get_field_call_result)
+ free(last_get_field_call_result);
+ last_get_field_call_result = get_field(fields_data,
+ fields_data_length,
+ field_to_get);
+ return(last_get_field_call_result);
+ }
+
+ if (!(result = string_dictionary_Fetch(non_number_variable_dict, name)))
+ result = "";
+
+ return(result);
+}
+
+/*
+ * void var_set_variable(string name, value)
+ * Requires: var_clear_all_variables has been called
+ * Modifies: The value of description langauge variable
+ * named name.
+ * Effects: Sets the description langauge variable named name
+ * to have the value value.
+ */
+
+void var_set_variable(name, value)
+ string name;
+ string value;
+{
+ string_dictionary_Set(is_number_variable(name) ? number_variable_dict
+ : non_number_variable_dict, name, value);
+}
+
+/*
+ * void var_set_variable_to_number(string name; int number)
+ * Requires: var_clear_all_variables has been called
+ * Modifies: The value of description langauge variable
+ * named name.
+ * Effects: Sets the description langauge variable named name
+ * to have as its value number's ascii representation.
+ */
+
+void var_set_variable_to_number(name, number)
+ string name;
+ int number;
+{
+ char buffer[20];
+
+ sprintf(buffer, "%d", number);
+ var_set_variable(name, buffer);
+}
+
+/*
+ * void var_set_variable_then_free_value(string name, value)
+ * Requires: var_clear_all_variables has been called, value is
+ * on the heap.
+ * Modifies: The value of description langauge variable
+ * named name, value
+ * Effects: Sets the description langauge variable named name
+ * to have the value value then frees value. This
+ * routine is slightly faster than calling var_set_variable
+ * then freeing value. It is provided mainly for
+ * convenience reasons.
+ */
+
+void var_set_variable_then_free_value(name, value)
+ string name;
+ string value;
+{
+ string_dictionary_binding *binding;
+ int exists;
+
+#ifdef DEBUG_MEMORY
+ if (!memory__on_heap_p(value))
+ abort(); /* <<<>>> */
+#endif
+
+ if (is_number_variable(name)) {
+ var_set_variable(name, value);
+ free(value);
+ return;
+ }
+
+ binding = string_dictionary_Define(non_number_variable_dict, name,
+ &exists);
+ if (exists)
+ free(binding->value);
+ binding->value = value;
+}
+
+/*
+ * void var_set_number_variables_to_fields(char *data, int length)
+ * Requires: var_clear_all_variables has been called
+ * Modifies: All numeric description language variables
+ * Effects: Treats data[0]..data[length-1] as a series of
+ * null-seperated fields. Sets $<number> (<number>
+ * here means [0-9]+ to field # <number> in data.
+ * Field 0 is defined to be "" as are all field #'s
+ * greater than the number of fields in data.
+ * Data[0]..data[length-1] must not be changed (or freed)
+ * until either this call is made again with different
+ * data or var_clear_all_variables is called.
+ */
+
+void var_set_number_variables_to_fields(data, length)
+ char *data;
+ int length;
+{
+ fields_data = data;
+ fields_data_length = length;
+
+ string_dictionary_SafeDestroy(number_variable_dict);
+ number_variable_dict = string_dictionary_Create(11);
+}
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