/* * tkOption.c -- * * This module contains procedures to manage the option * database, which allows various strings to be associated * with windows either by name or by class or both. * * Copyright (c) 1990-1994 The Regents of the University of California. * Copyright (c) 1994-1996 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * SCCS: @(#) tkOption.c 1.57 96/10/17 15:16:45 */ #include "tkPort.h" #include "tkInt.h" /* * The option database is stored as one tree for each main window. * Each name or class field in an option is associated with a node or * leaf of the tree. For example, the options "x.y.z" and "x.y*a" * each correspond to three nodes in the tree; they share the nodes * "x" and "x.y", but have different leaf nodes. One of the following * structures exists for each node or leaf in the option tree. It is * actually stored as part of the parent node, and describes a particular * child of the parent. */ typedef struct Element { Tk_Uid nameUid; /* Name or class from one element of * an option spec. */ union { struct ElArray *arrayPtr; /* If this is an intermediate node, * a pointer to a structure describing * the remaining elements of all * options whose prefixes are the * same up through this element. */ Tk_Uid valueUid; /* For leaf nodes, this is the string * value of the option. */ } child; int priority; /* Used to select among matching * options. Includes both the * priority level and a serial #. * Greater value means higher * priority. Irrelevant except in * leaf nodes. */ int flags; /* OR-ed combination of bits. See * below for values. */ } Element; /* * Flags in Element structures: * * CLASS - Non-zero means this element refers to a class, * Zero means this element refers to a name. * NODE - Zero means this is a leaf element (the child * field is a value, not a pointer to another node). * One means this is a node element. * WILDCARD - Non-zero means this there was a star in the * original specification just before this element. * Zero means there was a dot. */ #define TYPE_MASK 0x7 #define CLASS 0x1 #define NODE 0x2 #define WILDCARD 0x4 #define EXACT_LEAF_NAME 0x0 #define EXACT_LEAF_CLASS 0x1 #define EXACT_NODE_NAME 0x2 #define EXACT_NODE_CLASS 0x3 #define WILDCARD_LEAF_NAME 0x4 #define WILDCARD_LEAF_CLASS 0x5 #define WILDCARD_NODE_NAME 0x6 #define WILDCARD_NODE_CLASS 0x7 /* * The following structure is used to manage a dynamic array of * Elements. These structures are used for two purposes: to store * the contents of a node in the option tree, and for the option * stacks described below. */ typedef struct ElArray { int arraySize; /* Number of elements actually * allocated in the "els" array. */ int numUsed; /* Number of elements currently in * use out of els. */ Element *nextToUse; /* Pointer to &els[numUsed]. */ Element els[1]; /* Array of structures describing * children of this node. The * array will actually contain enough * elements for all of the children * (and even a few extras, perhaps). * This must be the last field in * the structure. */ } ElArray; #define EL_ARRAY_SIZE(numEls) ((unsigned) (sizeof(ElArray) \ + ((numEls)-1)*sizeof(Element))) #define INITIAL_SIZE 5 /* * In addition to the option tree, which is a relatively static structure, * there are eight additional structures called "stacks", which are used * to speed up queries into the option database. The stack structures * are designed for the situation where an individual widget makes repeated * requests for its particular options. The requests differ only in * their last name/class, so during the first request we extract all * the options pertaining to the particular widget and save them in a * stack-like cache; subsequent requests for the same widget can search * the cache relatively quickly. In fact, the cache is a hierarchical * one, storing a list of relevant options for this widget and all of * its ancestors up to the application root; hence the name "stack". * * Each of the eight stacks consists of an array of Elements, ordered in * terms of levels in the window hierarchy. All the elements relevant * for the top-level widget appear first in the array, followed by all * those from the next-level widget on the path to the current widget, * etc. down to those for the current widget. * * Cached information is divided into eight stacks according to the * CLASS, NODE, and WILDCARD flags. Leaf and non-leaf information is * kept separate to speed up individual probes (non-leaf information is * only relevant when building the stacks, but isn't relevant when * making probes; similarly, only non-leaf information is relevant * when the stacks are being extended to the next widget down in the * widget hierarchy). Wildcard elements are handled separately from * "exact" elements because once they appear at a particular level in * the stack they remain active for all deeper levels; exact elements * are only relevant at a particular level. For example, when searching * for options relevant in a particular window, the entire wildcard * stacks get checked, but only the portions of the exact stacks that * pertain to the window's parent. Lastly, name and class stacks are * kept separate because different search keys are used when searching * them; keeping them separate speeds up the searches. */ #define NUM_STACKS 8 static ElArray *stacks[NUM_STACKS]; static TkWindow *cachedWindow = NULL; /* Lowest-level window currently * loaded in stacks at present. * NULL means stacks have never * been used, or have been * invalidated because of a change * to the database. */ /* * One of the following structures is used to keep track of each * level in the stacks. */ typedef struct StackLevel { TkWindow *winPtr; /* Window corresponding to this stack * level. */ int bases[NUM_STACKS]; /* For each stack, index of first * element on stack corresponding to * this level (used to restore "numUsed" * fields when popping out of a level. */ } StackLevel; /* * Information about all of the stack levels that are currently * active. This array grows dynamically to become as large as needed. */ static StackLevel *levels = NULL; /* Array describing current stack. */ static int numLevels = 0; /* Total space allocated. */ static int curLevel = -1; /* Highest level currently in use. Note: * curLevel is never 0! (I don't remember * why anymore...) */ /* * The variable below is a serial number for all options entered into * the database so far. It increments on each addition to the option * database. It is used in computing option priorities, so that the * most recent entry wins when choosing between options at the same * priority level. */ static int serial = 0; /* * Special "no match" Element to use as default for searches. */ static Element defaultMatch; /* * Forward declarations for procedures defined in this file: */ static int AddFromString _ANSI_ARGS_((Tcl_Interp *interp, Tk_Window tkwin, char *string, int priority)); static void ClearOptionTree _ANSI_ARGS_((ElArray *arrayPtr)); static ElArray * ExtendArray _ANSI_ARGS_((ElArray *arrayPtr, Element *elPtr)); static void ExtendStacks _ANSI_ARGS_((ElArray *arrayPtr, int leaf)); static int GetDefaultOptions _ANSI_ARGS_((Tcl_Interp *interp, TkWindow *winPtr)); static ElArray * NewArray _ANSI_ARGS_((int numEls)); static void OptionInit _ANSI_ARGS_((TkMainInfo *mainPtr)); static int ParsePriority _ANSI_ARGS_((Tcl_Interp *interp, char *string)); static int ReadOptionFile _ANSI_ARGS_((Tcl_Interp *interp, Tk_Window tkwin, char *fileName, int priority)); static void SetupStacks _ANSI_ARGS_((TkWindow *winPtr, int leaf)); /* *-------------------------------------------------------------- * * Tk_AddOption -- * * Add a new option to the option database. * * Results: * None. * * Side effects: * Information is added to the option database. * *-------------------------------------------------------------- */ void Tk_AddOption(tkwin, name, value, priority) Tk_Window tkwin; /* Window token; option will be associated * with main window for this window. */ char *name; /* Multi-element name of option. */ char *value; /* String value for option. */ int priority; /* Overall priority level to use for * this option, such as TK_USER_DEFAULT_PRIO * or TK_INTERACTIVE_PRIO. Must be between * 0 and TK_MAX_PRIO. */ { TkWindow *winPtr = ((TkWindow *) tkwin)->mainPtr->winPtr; register ElArray **arrayPtrPtr; register Element *elPtr; Element newEl; register char *p; char *field; int count, firstField, length; #define TMP_SIZE 100 char tmp[TMP_SIZE+1]; if (winPtr->mainPtr->optionRootPtr == NULL) { OptionInit(winPtr->mainPtr); } cachedWindow = NULL; /* Invalidate the cache. */ /* * Compute the priority for the new element, including both the * overall level and the serial number (to disambiguate with the * level). */ if (priority < 0) { priority = 0; } else if (priority > TK_MAX_PRIO) { priority = TK_MAX_PRIO; } newEl.priority = (priority << 24) + serial; serial++; /* * Parse the option one field at a time. */ arrayPtrPtr = &(((TkWindow *) tkwin)->mainPtr->optionRootPtr); p = name; for (firstField = 1; ; firstField = 0) { /* * Scan the next field from the name and convert it to a Tk_Uid. * Must copy the field before calling Tk_Uid, so that a terminating * NULL may be added without modifying the source string. */ if (*p == '*') { newEl.flags = WILDCARD; p++; } else { newEl.flags = 0; } field = p; while ((*p != 0) && (*p != '.') && (*p != '*')) { p++; } length = p - field; if (length > TMP_SIZE) { length = TMP_SIZE; } strncpy(tmp, field, (size_t) length); tmp[length] = 0; newEl.nameUid = Tk_GetUid(tmp); if (isupper(UCHAR(*field))) { newEl.flags |= CLASS; } if (*p != 0) { /* * New element will be a node. If this option can't possibly * apply to this main window, then just skip it. Otherwise, * add it to the parent, if it isn't already there, and descend * into it. */ newEl.flags |= NODE; if (firstField && !(newEl.flags & WILDCARD) && (newEl.nameUid != winPtr->nameUid) && (newEl.nameUid != winPtr->classUid)) { return; } for (elPtr = (*arrayPtrPtr)->els, count = (*arrayPtrPtr)->numUsed; ; elPtr++, count--) { if (count == 0) { newEl.child.arrayPtr = NewArray(5); *arrayPtrPtr = ExtendArray(*arrayPtrPtr, &newEl); arrayPtrPtr = &((*arrayPtrPtr)->nextToUse[-1].child.arrayPtr); break; } if ((elPtr->nameUid == newEl.nameUid) && (elPtr->flags == newEl.flags)) { arrayPtrPtr = &(elPtr->child.arrayPtr); break; } } if (*p == '.') { p++; } } else { /* * New element is a leaf. Add it to the parent, if it isn't * already there. If it exists already, keep whichever value * has highest priority. */ newEl.child.valueUid = Tk_GetUid(value); for (elPtr = (*arrayPtrPtr)->els, count = (*arrayPtrPtr)->numUsed; ; elPtr++, count--) { if (count == 0) { *arrayPtrPtr = ExtendArray(*arrayPtrPtr, &newEl); return; } if ((elPtr->nameUid == newEl.nameUid) && (elPtr->flags == newEl.flags)) { if (elPtr->priority < newEl.priority) { elPtr->priority = newEl.priority; elPtr->child.valueUid = newEl.child.valueUid; } return; } } } } } /* *-------------------------------------------------------------- * * Tk_GetOption -- * * Retrieve an option from the option database. * * Results: * The return value is the value specified in the option * database for the given name and class on the given * window. If there is nothing specified in the database * for that option, then NULL is returned. * * Side effects: * The internal caches used to speed up option mapping * may be modified, if this tkwin is different from the * last tkwin used for option retrieval. * *-------------------------------------------------------------- */ Tk_Uid Tk_GetOption(tkwin, name, className) Tk_Window tkwin; /* Token for window that option is * associated with. */ char *name; /* Name of option. */ char *className; /* Class of option. NULL means there * is no class for this option: just * check for name. */ { Tk_Uid nameId, classId; register Element *elPtr, *bestPtr; register int count; /* * Note: no need to call OptionInit here: it will be done by * the SetupStacks call below (squeeze out those nanoseconds). */ if (tkwin != (Tk_Window) cachedWindow) { SetupStacks((TkWindow *) tkwin, 1); } nameId = Tk_GetUid(name); bestPtr = &defaultMatch; for (elPtr = stacks[EXACT_LEAF_NAME]->els, count = stacks[EXACT_LEAF_NAME]->numUsed; count > 0; elPtr++, count--) { if ((elPtr->nameUid == nameId) && (elPtr->priority > bestPtr->priority)) { bestPtr = elPtr; } } for (elPtr = stacks[WILDCARD_LEAF_NAME]->els, count = stacks[WILDCARD_LEAF_NAME]->numUsed; count > 0; elPtr++, count--) { if ((elPtr->nameUid == nameId) && (elPtr->priority > bestPtr->priority)) { bestPtr = elPtr; } } if (className != NULL) { classId = Tk_GetUid(className); for (elPtr = stacks[EXACT_LEAF_CLASS]->els, count = stacks[EXACT_LEAF_CLASS]->numUsed; count > 0; elPtr++, count--) { if ((elPtr->nameUid == classId) && (elPtr->priority > bestPtr->priority)) { bestPtr = elPtr; } } for (elPtr = stacks[WILDCARD_LEAF_CLASS]->els, count = stacks[WILDCARD_LEAF_CLASS]->numUsed; count > 0; elPtr++, count--) { if ((elPtr->nameUid == classId) && (elPtr->priority > bestPtr->priority)) { bestPtr = elPtr; } } } return bestPtr->child.valueUid; } /* *-------------------------------------------------------------- * * Tk_OptionCmd -- * * This procedure is invoked to process the "option" Tcl command. * See the user documentation for details on what it does. * * Results: * A standard Tcl result. * * Side effects: * See the user documentation. * *-------------------------------------------------------------- */ int Tk_OptionCmd(clientData, interp, argc, argv) ClientData clientData; /* Main window associated with * interpreter. */ Tcl_Interp *interp; /* Current interpreter. */ int argc; /* Number of arguments. */ char **argv; /* Argument strings. */ { Tk_Window tkwin = (Tk_Window) clientData; size_t length; char c; if (argc < 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " cmd arg ?arg ...?\"", (char *) NULL); return TCL_ERROR; } c = argv[1][0]; length = strlen(argv[1]); if ((c == 'a') && (strncmp(argv[1], "add", length) == 0)) { int priority; if ((argc != 4) && (argc != 5)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " add pattern value ?priority?\"", (char *) NULL); return TCL_ERROR; } if (argc == 4) { priority = TK_INTERACTIVE_PRIO; } else { priority = ParsePriority(interp, argv[4]); if (priority < 0) { return TCL_ERROR; } } Tk_AddOption(tkwin, argv[2], argv[3], priority); return TCL_OK; } else if ((c == 'c') && (strncmp(argv[1], "clear", length) == 0)) { TkMainInfo *mainPtr; if (argc != 2) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " clear\"", (char *) NULL); return TCL_ERROR; } mainPtr = ((TkWindow *) tkwin)->mainPtr; if (mainPtr->optionRootPtr != NULL) { ClearOptionTree(mainPtr->optionRootPtr); mainPtr->optionRootPtr = NULL; } cachedWindow = NULL; return TCL_OK; } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) { Tk_Window window; Tk_Uid value; if (argc != 5) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " get window name class\"", (char *) NULL); return TCL_ERROR; } window = Tk_NameToWindow(interp, argv[2], tkwin); if (window == NULL) { return TCL_ERROR; } value = Tk_GetOption(window, argv[3], argv[4]); if (value != NULL) { #ifdef STk_CODE STk_stringify_result(interp, value); #else interp->result = value; #endif } return TCL_OK; } else if ((c == 'r') && (strncmp(argv[1], "readfile", length) == 0)) { int priority; if ((argc != 3) && (argc != 4)) { Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0], " readfile fileName ?priority?\"", (char *) NULL); return TCL_ERROR; } if (argc == 4) { priority = ParsePriority(interp, argv[3]); if (priority < 0) { return TCL_ERROR; } } else { priority = TK_INTERACTIVE_PRIO; } return ReadOptionFile(interp, tkwin, argv[2], priority); } else { Tcl_AppendResult(interp, "bad option \"", argv[1], "\": must be add, clear, get, or readfile", (char *) NULL); return TCL_ERROR; } } /* *-------------------------------------------------------------- * * TkOptionDeadWindow -- * * This procedure is called whenever a window is deleted. * It cleans up any option-related stuff associated with * the window. * * Results: * None. * * Side effects: * Option-related resources are freed. See code below * for details. * *-------------------------------------------------------------- */ void TkOptionDeadWindow(winPtr) register TkWindow *winPtr; /* Window to be cleaned up. */ { /* * If this window is in the option stacks, then clear the stacks. */ if (winPtr->optionLevel != -1) { int i; for (i = 1; i <= curLevel; i++) { levels[i].winPtr->optionLevel = -1; } curLevel = -1; cachedWindow = NULL; } /* * If this window was a main window, then delete its option * database. */ if ((winPtr->mainPtr->winPtr == winPtr) && (winPtr->mainPtr->optionRootPtr != NULL)) { ClearOptionTree(winPtr->mainPtr->optionRootPtr); winPtr->mainPtr->optionRootPtr = NULL; } } /* *---------------------------------------------------------------------- * * TkOptionClassChanged -- * * This procedure is invoked when a window's class changes. If * the window is on the option cache, this procedure flushes * any information for the window, since the new class could change * what is relevant. * * Results: * None. * * Side effects: * The option cache may be flushed in part or in whole. * *---------------------------------------------------------------------- */ void TkOptionClassChanged(winPtr) TkWindow *winPtr; /* Window whose class changed. */ { int i, j, *basePtr; ElArray *arrayPtr; if (winPtr->optionLevel == -1) { return; } /* * Find the lowest stack level that refers to this window, then * flush all of the levels above the matching one. */ for (i = 1; i <= curLevel; i++) { if (levels[i].winPtr == winPtr) { for (j = i; j <= curLevel; j++) { levels[j].winPtr->optionLevel = -1; } curLevel = i-1; basePtr = levels[i].bases; for (j = 0; j < NUM_STACKS; j++) { arrayPtr = stacks[j]; arrayPtr->numUsed = basePtr[j]; arrayPtr->nextToUse = &arrayPtr->els[arrayPtr->numUsed]; } if (curLevel <= 0) { cachedWindow = NULL; } else { cachedWindow = levels[curLevel].winPtr; } break; } } } /* *---------------------------------------------------------------------- * * ParsePriority -- * * Parse a string priority value. * * Results: * The return value is the integer priority level corresponding * to string, or -1 if string doesn't point to a valid priority level. * In this case, an error message is left in interp->result. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int ParsePriority(interp, string) Tcl_Interp *interp; /* Interpreter to use for error reporting. */ char *string; /* Describes a priority level, either * symbolically or numerically. */ { int priority, c; size_t length; c = string[0]; length = strlen(string); if ((c == 'w') && (strncmp(string, "widgetDefault", length) == 0)) { return TK_WIDGET_DEFAULT_PRIO; } else if ((c == 's') && (strncmp(string, "startupFile", length) == 0)) { return TK_STARTUP_FILE_PRIO; } else if ((c == 'u') && (strncmp(string, "userDefault", length) == 0)) { return TK_USER_DEFAULT_PRIO; } else if ((c == 'i') && (strncmp(string, "interactive", length) == 0)) { return TK_INTERACTIVE_PRIO; } else { char *end; priority = strtoul(string, &end, 0); if ((end == string) || (*end != 0) || (priority < 0) || (priority > 100)) { Tcl_AppendResult(interp, "bad priority level \"", string, "\": must be widgetDefault, startupFile, userDefault, ", "interactive, or a number between 0 and 100", (char *) NULL); return -1; } } return priority; } /* *---------------------------------------------------------------------- * * AddFromString -- * * Given a string containing lines in the standard format for * X resources (see other documentation for details on what this * is), parse the resource specifications and enter them as options * for tkwin's main window. * * Results: * The return value is a standard Tcl return code. In the case of * an error in parsing string, TCL_ERROR will be returned and an * error message will be left in interp->result. The memory at * string is totally trashed by this procedure. If you care about * its contents, make a copy before calling here. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int AddFromString(interp, tkwin, string, priority) Tcl_Interp *interp; /* Interpreter to use for reporting results. */ Tk_Window tkwin; /* Token for window: options are entered * for this window's main window. */ char *string; /* String containing option specifiers. */ int priority; /* Priority level to use for options in * this string, such as TK_USER_DEFAULT_PRIO * or TK_INTERACTIVE_PRIO. Must be between * 0 and TK_MAX_PRIO. */ { register char *src, *dst; char *name, *value; int lineNum; src = string; lineNum = 1; while (1) { /* * Skip leading white space and empty lines and comment lines, and * check for the end of the spec. */ while ((*src == ' ') || (*src == '\t')) { src++; } if ((*src == '#') || (*src == '!')) { do { src++; if ((src[0] == '\\') && (src[1] == '\n')) { src += 2; lineNum++; } } while ((*src != '\n') && (*src != 0)); } if (*src == '\n') { src++; lineNum++; continue; } if (*src == '\0') { break; } /* * Parse off the option name, collapsing out backslash-newline * sequences of course. */ dst = name = src; while (*src != ':') { if ((*src == '\0') || (*src == '\n')) { sprintf(interp->result, "missing colon on line %d", lineNum); return TCL_ERROR; } if ((src[0] == '\\') && (src[1] == '\n')) { src += 2; lineNum++; } else { *dst = *src; dst++; src++; } } /* * Eliminate trailing white space on the name, and null-terminate * it. */ while ((dst != name) && ((dst[-1] == ' ') || (dst[-1] == '\t'))) { dst--; } *dst = '\0'; /* * Skip white space between the name and the value. */ src++; while ((*src == ' ') || (*src == '\t')) { src++; } if (*src == '\0') { sprintf(interp->result, "missing value on line %d", lineNum); return TCL_ERROR; } /* * Parse off the value, squeezing out backslash-newline sequences * along the way. */ dst = value = src; while (*src != '\n') { if (*src == '\0') { sprintf(interp->result, "missing newline on line %d", lineNum); return TCL_ERROR; } if ((src[0] == '\\') && (src[1] == '\n')) { src += 2; lineNum++; } else { *dst = *src; dst++; src++; } } *dst = 0; /* * Enter the option into the database. */ Tk_AddOption(tkwin, name, value, priority); src++; lineNum++; } return TCL_OK; } /* *---------------------------------------------------------------------- * * ReadOptionFile -- * * Read a file of options ("resources" in the old X terminology) * and load them into the option database. * * Results: * The return value is a standard Tcl return code. In the case of * an error in parsing string, TCL_ERROR will be returned and an * error message will be left in interp->result. * * Side effects: * None. * *---------------------------------------------------------------------- */ static int ReadOptionFile(interp, tkwin, fileName, priority) Tcl_Interp *interp; /* Interpreter to use for reporting results. */ Tk_Window tkwin; /* Token for window: options are entered * for this window's main window. */ char *fileName; /* Name of file containing options. */ int priority; /* Priority level to use for options in * this file, such as TK_USER_DEFAULT_PRIO * or TK_INTERACTIVE_PRIO. Must be between * 0 and TK_MAX_PRIO. */ { char *realName, *buffer; int result, bufferSize; Tcl_Channel chan; Tcl_DString newName; /* * Prevent file system access in a safe interpreter. */ if (Tcl_IsSafe(interp)) { Tcl_AppendResult(interp, "can't read options from a file in a", " safe interpreter", (char *) NULL); return TCL_ERROR; } realName = Tcl_TranslateFileName(interp, fileName, &newName); if (realName == NULL) { return TCL_ERROR; } chan = Tcl_OpenFileChannel(interp, realName, "r", 0); Tcl_DStringFree(&newName); if (chan == NULL) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "couldn't open \"", fileName, "\": ", Tcl_PosixError(interp), (char *) NULL); return TCL_ERROR; } /* * Compute size of file by seeking to the end of the file. This will * overallocate if we are performing CRLF translation. */ bufferSize = Tcl_Seek(chan, 0L, SEEK_END); (void) Tcl_Seek(chan, 0L, SEEK_SET); if (bufferSize < 0) { Tcl_AppendResult(interp, "error seeking to end of file \"", fileName, "\":", Tcl_PosixError(interp), (char *) NULL); Tcl_Close(NULL, chan); return TCL_ERROR; } buffer = (char *) ckalloc((unsigned) bufferSize+1); bufferSize = Tcl_Read(chan, buffer, bufferSize); if (bufferSize < 0) { Tcl_AppendResult(interp, "error reading file \"", fileName, "\":", Tcl_PosixError(interp), (char *) NULL); Tcl_Close(NULL, chan); return TCL_ERROR; } Tcl_Close(NULL, chan); buffer[bufferSize] = 0; result = AddFromString(interp, tkwin, buffer, priority); ckfree(buffer); return result; } /* *-------------------------------------------------------------- * * NewArray -- * * Create a new ElArray structure of a given size. * * Results: * The return value is a pointer to a properly initialized * element array with "numEls" space. The array is marked * as having no active elements. * * Side effects: * Memory is allocated. * *-------------------------------------------------------------- */ static ElArray * NewArray(numEls) int numEls; /* How many elements of space to allocate. */ { register ElArray *arrayPtr; arrayPtr = (ElArray *) ckalloc(EL_ARRAY_SIZE(numEls)); arrayPtr->arraySize = numEls; arrayPtr->numUsed = 0; arrayPtr->nextToUse = arrayPtr->els; return arrayPtr; } /* *-------------------------------------------------------------- * * ExtendArray -- * * Add a new element to an array, extending the array if * necessary. * * Results: * The return value is a pointer to the new array, which * will be different from arrayPtr if the array got expanded. * * Side effects: * Memory may be allocated or freed. * *-------------------------------------------------------------- */ static ElArray * ExtendArray(arrayPtr, elPtr) register ElArray *arrayPtr; /* Array to be extended. */ register Element *elPtr; /* Element to be copied into array. */ { /* * If the current array has filled up, make it bigger. */ if (arrayPtr->numUsed >= arrayPtr->arraySize) { register ElArray *newPtr; newPtr = (ElArray *) ckalloc(EL_ARRAY_SIZE(2*arrayPtr->arraySize)); newPtr->arraySize = 2*arrayPtr->arraySize; newPtr->numUsed = arrayPtr->numUsed; newPtr->nextToUse = &newPtr->els[newPtr->numUsed]; memcpy((VOID *) newPtr->els, (VOID *) arrayPtr->els, (arrayPtr->arraySize*sizeof(Element))); ckfree((char *) arrayPtr); arrayPtr = newPtr; } *arrayPtr->nextToUse = *elPtr; arrayPtr->nextToUse++; arrayPtr->numUsed++; return arrayPtr; } /* *-------------------------------------------------------------- * * SetupStacks -- * * Arrange the stacks so that they cache all the option * information for a particular window. * * Results: * None. * * Side effects: * The stacks are modified to hold information for tkwin * and all its ancestors in the window hierarchy. * *-------------------------------------------------------------- */ static void SetupStacks(winPtr, leaf) TkWindow *winPtr; /* Window for which information is to * be cached. */ int leaf; /* Non-zero means this is the leaf * window being probed. Zero means this * is an ancestor of the desired leaf. */ { int level, i, *iPtr; register StackLevel *levelPtr; register ElArray *arrayPtr; /* * The following array defines the order in which the current * stacks are searched to find matching entries to add to the * stacks. Given the current priority-based scheme, the order * below is no longer relevant; all that matters is that an * element is on the list *somewhere*. The ordering is a relic * of the old days when priorities were determined differently. */ static int searchOrder[] = {WILDCARD_NODE_CLASS, WILDCARD_NODE_NAME, EXACT_NODE_CLASS, EXACT_NODE_NAME, -1}; if (winPtr->mainPtr->optionRootPtr == NULL) { OptionInit(winPtr->mainPtr); } /* * Step 1: make sure that options are cached for this window's * parent. */ if (winPtr->parentPtr != NULL) { level = winPtr->parentPtr->optionLevel; if ((level == -1) || (cachedWindow == NULL)) { SetupStacks(winPtr->parentPtr, 0); level = winPtr->parentPtr->optionLevel; } level++; } else { level = 1; } /* * Step 2: pop extra unneeded information off the stacks and * mark those windows as no longer having cached information. */ if (curLevel >= level) { while (curLevel >= level) { levels[curLevel].winPtr->optionLevel = -1; curLevel--; } levelPtr = &levels[level]; for (i = 0; i < NUM_STACKS; i++) { arrayPtr = stacks[i]; arrayPtr->numUsed = levelPtr->bases[i]; arrayPtr->nextToUse = &arrayPtr->els[arrayPtr->numUsed]; } } curLevel = winPtr->optionLevel = level; /* * Step 3: if the root database information isn't loaded or * isn't valid, initialize level 0 of the stack from the * database root (this only happens if winPtr is a main window). */ if ((curLevel == 1) && ((cachedWindow == NULL) || (cachedWindow->mainPtr != winPtr->mainPtr))) { for (i = 0; i < NUM_STACKS; i++) { arrayPtr = stacks[i]; arrayPtr->numUsed = 0; arrayPtr->nextToUse = arrayPtr->els; } ExtendStacks(winPtr->mainPtr->optionRootPtr, 0); } /* * Step 4: create a new stack level; grow the level array if * we've run out of levels. Clear the stacks for EXACT_LEAF_NAME * and EXACT_LEAF_CLASS (anything that was there is of no use * any more). */ if (curLevel >= numLevels) { StackLevel *newLevels; newLevels = (StackLevel *) ckalloc((unsigned) (numLevels*2*sizeof(StackLevel))); memcpy((VOID *) newLevels, (VOID *) levels, (numLevels*sizeof(StackLevel))); ckfree((char *) levels); numLevels *= 2; levels = newLevels; } levelPtr = &levels[curLevel]; levelPtr->winPtr = winPtr; arrayPtr = stacks[EXACT_LEAF_NAME]; arrayPtr->numUsed = 0; arrayPtr->nextToUse = arrayPtr->els; arrayPtr = stacks[EXACT_LEAF_CLASS]; arrayPtr->numUsed = 0; arrayPtr->nextToUse = arrayPtr->els; levelPtr->bases[EXACT_LEAF_NAME] = stacks[EXACT_LEAF_NAME]->numUsed; levelPtr->bases[EXACT_LEAF_CLASS] = stacks[EXACT_LEAF_CLASS]->numUsed; levelPtr->bases[EXACT_NODE_NAME] = stacks[EXACT_NODE_NAME]->numUsed; levelPtr->bases[EXACT_NODE_CLASS] = stacks[EXACT_NODE_CLASS]->numUsed; levelPtr->bases[WILDCARD_LEAF_NAME] = stacks[WILDCARD_LEAF_NAME]->numUsed; levelPtr->bases[WILDCARD_LEAF_CLASS] = stacks[WILDCARD_LEAF_CLASS]->numUsed; levelPtr->bases[WILDCARD_NODE_NAME] = stacks[WILDCARD_NODE_NAME]->numUsed; levelPtr->bases[WILDCARD_NODE_CLASS] = stacks[WILDCARD_NODE_CLASS]->numUsed; /* * Step 5: scan the current stack level looking for matches to this * window's name or class; where found, add new information to the * stacks. */ for (iPtr = searchOrder; *iPtr != -1; iPtr++) { register Element *elPtr; int count; Tk_Uid id; i = *iPtr; if (i & CLASS) { id = winPtr->classUid; } else { id = winPtr->nameUid; } elPtr = stacks[i]->els; count = levelPtr->bases[i]; /* * For wildcard stacks, check all entries; for non-wildcard * stacks, only check things that matched in the parent. */ if (!(i & WILDCARD)) { elPtr += levelPtr[-1].bases[i]; count -= levelPtr[-1].bases[i]; } for ( ; count > 0; elPtr++, count--) { if (elPtr->nameUid != id) { continue; } ExtendStacks(elPtr->child.arrayPtr, leaf); } } cachedWindow = winPtr; } /* *-------------------------------------------------------------- * * ExtendStacks -- * * Given an element array, copy all the elements from the * array onto the system stacks (except for irrelevant leaf * elements). * * Results: * None. * * Side effects: * The option stacks are extended. * *-------------------------------------------------------------- */ static void ExtendStacks(arrayPtr, leaf) ElArray *arrayPtr; /* Array of elements to copy onto stacks. */ int leaf; /* If zero, then don't copy exact leaf * elements. */ { register int count; register Element *elPtr; for (elPtr = arrayPtr->els, count = arrayPtr->numUsed; count > 0; elPtr++, count--) { if (!(elPtr->flags & (NODE|WILDCARD)) && !leaf) { continue; } stacks[elPtr->flags] = ExtendArray(stacks[elPtr->flags], elPtr); } } /* *-------------------------------------------------------------- * * OptionInit -- * * Initialize data structures for option handling. * * Results: * None. * * Side effects: * Option-related data structures get initialized. * *-------------------------------------------------------------- */ static void OptionInit(mainPtr) register TkMainInfo *mainPtr; /* Top-level information about * window that isn't initialized * yet. */ { int i; Tcl_Interp *interp; /* * First, once-only initialization. */ if (numLevels == 0) { numLevels = 5; levels = (StackLevel *) ckalloc((unsigned) (5*sizeof(StackLevel))); for (i = 0; i < NUM_STACKS; i++) { stacks[i] = NewArray(10); levels[0].bases[i] = 0; } defaultMatch.nameUid = NULL; defaultMatch.child.valueUid = NULL; defaultMatch.priority = -1; defaultMatch.flags = 0; } /* * Then, per-main-window initialization. Create and delete dummy * interpreter for message logging. */ mainPtr->optionRootPtr = NewArray(20); interp = Tcl_CreateInterp(); (void) GetDefaultOptions(interp, mainPtr->winPtr); Tcl_DeleteInterp(interp); } /* *-------------------------------------------------------------- * * ClearOptionTree -- * * This procedure is called to erase everything in a * hierarchical option database. * * Results: * None. * * Side effects: * All the options associated with arrayPtr are deleted, * along with all option subtrees. The space pointed to * by arrayPtr is freed. * *-------------------------------------------------------------- */ static void ClearOptionTree(arrayPtr) ElArray *arrayPtr; /* Array of options; delete everything * referred to recursively by this. */ { register Element *elPtr; int count; for (count = arrayPtr->numUsed, elPtr = arrayPtr->els; count > 0; count--, elPtr++) { if (elPtr->flags & NODE) { ClearOptionTree(elPtr->child.arrayPtr); } } ckfree((char *) arrayPtr); } /* *-------------------------------------------------------------- * * GetDefaultOptions -- * * This procedure is invoked to load the default set of options * for a window. * * Results: * None. * * Side effects: * Options are added to those for winPtr's main window. If * there exists a RESOURCE_MANAGER proprety for winPtr's * display, that is used. Otherwise, the .Xdefaults file in * the user's home directory is used. * *-------------------------------------------------------------- */ static int GetDefaultOptions(interp, winPtr) Tcl_Interp *interp; /* Interpreter to use for error reporting. */ TkWindow *winPtr; /* Fetch option defaults for main window * associated with this. */ { char *regProp; int result, actualFormat; unsigned long numItems, bytesAfter; Atom actualType; /* * Try the RESOURCE_MANAGER property on the root window first. */ regProp = NULL; result = XGetWindowProperty(winPtr->display, RootWindow(winPtr->display, 0), XA_RESOURCE_MANAGER, 0, 100000, False, XA_STRING, &actualType, &actualFormat, &numItems, &bytesAfter, (unsigned char **) ®Prop); if ((result == Success) && (actualType == XA_STRING) && (actualFormat == 8)) { result = AddFromString(interp, (Tk_Window) winPtr, regProp, TK_USER_DEFAULT_PRIO); XFree(regProp); return result; } /* * No luck there. Try a .Xdefaults file in the user's home * directory. */ if (regProp != NULL) { XFree(regProp); } result = ReadOptionFile(interp, (Tk_Window) winPtr, "~/.Xdefaults", TK_USER_DEFAULT_PRIO); return result; }