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ckOption.c
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ckOption.c
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/*
* ckOption.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) 1994-1995 Sun Microsystems, Inc.
* Copyright (c) 1995 Christian Werner
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "ckPort.h"
#include "ck.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 {
Ck_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. */
Ck_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 CkWindow *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 {
CkWindow *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,
CkWindow *winPtr, 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 ElArray * NewArray _ANSI_ARGS_((int numEls));
static void OptionInit _ANSI_ARGS_((CkMainInfo *mainPtr));
static int ParsePriority _ANSI_ARGS_((Tcl_Interp *interp,
char *string));
static int ReadOptionFile _ANSI_ARGS_((Tcl_Interp *interp,
CkWindow *winPtr, char *fileName, int priority));
static void SetupStacks _ANSI_ARGS_((CkWindow *winPtr, int leaf));
/*
*--------------------------------------------------------------
*
* Ck_AddOption --
*
* Add a new option to the option database.
*
* Results:
* None.
*
* Side effects:
* Information is added to the option database.
*
*--------------------------------------------------------------
*/
void
Ck_AddOption(winPtr, name, value, priority)
CkWindow *winPtr; /* Window pointer; 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 CK_USER_DEFAULT_PRIO
* or CK_INTERACTIVE_PRIO. Must be between
* 0 and CK_MAX_PRIO. */
{
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];
winPtr = winPtr->mainPtr->winPtr;
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 > CK_MAX_PRIO) {
priority = CK_MAX_PRIO;
}
newEl.priority = (priority << 24) + serial;
serial++;
/*
* Parse the option one field at a time.
*/
arrayPtrPtr = &(winPtr->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 = Ck_GetUid(tmp);
if (isupper((unsigned char) *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 = Ck_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;
}
}
}
}
}
/*
*--------------------------------------------------------------
*
* Ck_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.
*
*--------------------------------------------------------------
*/
Ck_Uid
Ck_GetOption(winPtr, name, className)
CkWindow *winPtr; /* Pointer to 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. */
{
Ck_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 (winPtr != cachedWindow) {
SetupStacks(winPtr, 1);
}
nameId = Ck_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 = Ck_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;
}
/*
*--------------------------------------------------------------
*
* Ck_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
Ck_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. */
{
CkWindow *winPtr = (CkWindow *) 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 = CK_INTERACTIVE_PRIO;
} else {
priority = ParsePriority(interp, argv[4]);
if (priority < 0) {
return TCL_ERROR;
}
}
Ck_AddOption(winPtr, argv[2], argv[3], priority);
return TCL_OK;
} else if ((c == 'c') && (strncmp(argv[1], "clear", length) == 0)) {
CkMainInfo *mainPtr;
if (argc != 2) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " clear\"", (char *) NULL);
return TCL_ERROR;
}
mainPtr = winPtr->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)) {
CkWindow *winPtr2;
Ck_Uid value;
if (argc != 5) {
Tcl_AppendResult(interp, "wrong # args: should be \"",
argv[0], " get window name class\"", (char *) NULL);
return TCL_ERROR;
}
winPtr2 = Ck_NameToWindow(interp, argv[2], winPtr);
if (winPtr2 == NULL) {
return TCL_ERROR;
}
value = Ck_GetOption(winPtr2, argv[3], argv[4]);
if (value != NULL) {
Tcl_SetObjResult( interp, Tcl_NewStringObj(value,-1));
}
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 = CK_INTERACTIVE_PRIO;
}
return ReadOptionFile(interp, winPtr, argv[2], priority);
} else {
Tcl_AppendResult(interp, "bad option \"", argv[1],
"\": must be add, clear, get, or readfile", (char *) NULL);
return TCL_ERROR;
}
}
/*
*--------------------------------------------------------------
*
* Ck_OptionCmdObj --
*
* 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
Ck_OptionCmdObj(clientData, interp, objc, objv)
ClientData clientData; /* Main window associated with
* interpreter. */
Tcl_Interp *interp; /* Current interpreter. */
int objc; /* Number of arguments. */
Tcl_Obj* CONST objv[]; /* Tcl_Obj* array of arguments. */
{
static char *commands[] = { "add", "clear", "get", "readfile", NULL };
enum { CMD_ADD, CMD_CLEAR, CMD_GET, CMD_READFILE };
CkWindow *winPtr = (CkWindow *) clientData;
int index;
if (objc < 2) {
Tcl_WrongNumArgs( interp, 1, objv, "cmd arg ?arg ...?");
return TCL_ERROR;
}
if (Tcl_GetIndexFromObj( interp, objv[1], commands, "command", TCL_EXACT, &index) != TCL_OK) {
return TCL_ERROR;
}
switch (index) {
case CMD_ADD:
{
int priority;
if ((objc != 4) && (objc != 5)) {
Tcl_WrongNumArgs(interp, 2, objv, "pattern value ?priority?");
return TCL_ERROR;
}
if (objc == 4) {
priority = CK_INTERACTIVE_PRIO;
} else {
priority = ParsePriority(interp, Tcl_GetString(objv[4]));
if (priority < 0) {
return TCL_ERROR;
}
}
Ck_AddOption(winPtr, Tcl_GetString(objv[2]), Tcl_GetString(objv[3]), priority);
return TCL_OK;
}
break;
case CMD_CLEAR:
{
CkMainInfo *mainPtr;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 2, objv, "");
return TCL_ERROR;
}
mainPtr = winPtr->mainPtr;
if (mainPtr->optionRootPtr != NULL) {
ClearOptionTree(mainPtr->optionRootPtr);
mainPtr->optionRootPtr = NULL;
}
cachedWindow = NULL;
return TCL_OK;
}
break;
case CMD_GET:
{
CkWindow *winPtr2;
Ck_Uid value;
if (objc != 5) {
Tcl_WrongNumArgs(interp, 2, objv, "window name class");
return TCL_ERROR;
}
winPtr2 = Ck_NameToWindow(interp, Tcl_GetString(objv[2]), winPtr);
if (winPtr2 == NULL) {
return TCL_ERROR;
}
value = Ck_GetOption(winPtr2, Tcl_GetString(objv[3]), Tcl_GetString(objv[4]));
if (value != NULL) {
Tcl_SetObjResult( interp, Tcl_NewStringObj(value,-1));
}
return TCL_OK;
}
break;
case CMD_READFILE:
{
int priority;
if ((objc != 3) && (objc != 4)) {
Tcl_WrongNumArgs(interp, 1, objv, "fileName ?priority?");
return TCL_ERROR;
}
if (objc == 4) {
priority = ParsePriority(interp, Tcl_GetString(objv[3]));
if (priority < 0) {
return TCL_ERROR;
}
} else {
priority = CK_INTERACTIVE_PRIO;
}
return ReadOptionFile(interp, winPtr, Tcl_GetString(objv[2]), priority);
}
break;
default:
/* -- should not be reached ever !! -- */
Tcl_AppendResult(interp, "bad option \"", Tcl_GetString(objv[1]),
"\": must be add, clear, get, or readfile", (char *) NULL);
return TCL_ERROR;
}
}
/*
*--------------------------------------------------------------
*
* CkOptionDeadWindow --
*
* 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
CkOptionDeadWindow(winPtr)
register CkWindow *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;
}
}
/*
*----------------------------------------------------------------------
*
* CkOptionClassChanged --
*
* 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
CkOptionClassChanged(winPtr)
CkWindow *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 CK_WIDGET_DEFAULT_PRIO;
} else if ((c == 's')
&& (strncmp(string, "startupFile", length) == 0)) {
return CK_STARTUP_FILE_PRIO;
} else if ((c == 'u')
&& (strncmp(string, "userDefault", length) == 0)) {
return CK_USER_DEFAULT_PRIO;
} else if ((c == 'i')
&& (strncmp(string, "interactive", length) == 0)) {
return CK_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, winPtr, string, priority)
Tcl_Interp *interp; /* Interpreter to use for reporting results. */
CkWindow *winPtr; /* Pointer to 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')) {
char buf[256];
sprintf(buf, "missing colon on line %d", lineNum);
Tcl_SetObjResult(interp, Tcl_NewStringObj(buf,-1));
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') {
char buf[256];
sprintf(buf, "missing value on line %d", lineNum);
Tcl_SetObjResult( interp, Tcl_NewStringObj(buf,-1));
return TCL_ERROR;
}
/*
* Parse off the value, squeezing out backslash-newline sequences
* along the way.
*/
dst = value = src;
while (*src != '\n') {
if (*src == '\0') {
char buf[256];
sprintf(buf, "missing newline on line %d", lineNum);
Tcl_SetObjResult( interp, Tcl_NewStringObj(buf,-1));
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.
*/
Ck_AddOption(winPtr, name, value, priority);
src++;
lineNum++;
}
return TCL_OK;
}
/*
*----------------------------------------------------------------------
*
* ReadOptionFile --