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if_xcmdsrv.c
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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
* X command server by Flemming Madsen
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*
* if_xcmdsrv.c: Functions for passing commands through an X11 display.
*
*/
#include "vim.h"
#include "version.h"
#if defined(FEAT_CLIENTSERVER) || defined(PROTO)
# ifdef FEAT_X11
# include <X11/Intrinsic.h>
# include <X11/Xatom.h>
# endif
/*
* This file provides procedures that implement the command server
* functionality of Vim when in contact with an X11 server.
*
* Adapted from TCL/TK's send command in tkSend.c of the tk 3.6 distribution.
* Adapted for use in Vim by Flemming Madsen. Protocol changed to that of tk 4
*/
/*
* Copyright (c) 1989-1993 The Regents of the University of California.
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
/*
* When a result is being awaited from a sent command, one of
* the following structures is present on a list of all outstanding
* sent commands. The information in the structure is used to
* process the result when it arrives. You're probably wondering
* how there could ever be multiple outstanding sent commands.
* This could happen if Vim instances invoke each other recursively.
* It's unlikely, but possible.
*/
typedef struct PendingCommand
{
int serial; /* Serial number expected in result. */
int code; /* Result Code. 0 is OK */
char_u *result; /* String result for command (malloc'ed).
* NULL means command still pending. */
struct PendingCommand *nextPtr;
/* Next in list of all outstanding commands.
* NULL means end of list. */
} PendingCommand;
static PendingCommand *pendingCommands = NULL;
/* List of all commands currently
* being waited for. */
/*
* The information below is used for communication between processes
* during "send" commands. Each process keeps a private window, never
* even mapped, with one property, "Comm". When a command is sent to
* an interpreter, the command is appended to the comm property of the
* communication window associated with the interp's process. Similarly,
* when a result is returned from a sent command, it is also appended
* to the comm property.
*
* Each command and each result takes the form of ASCII text. For a
* command, the text consists of a nul character followed by several
* nul-terminated ASCII strings. The first string consists of a
* single letter:
* "c" for an expression
* "k" for keystrokes
* "r" for reply
* "n" for notification.
* Subsequent strings have the form "option value" where the following options
* are supported:
*
* -r commWindow serial
*
* This option means that a response should be sent to the window
* whose X identifier is "commWindow" (in hex), and the response should
* be identified with the serial number given by "serial" (in decimal).
* If this option isn't specified then the send is asynchronous and
* no response is sent.
*
* -n name
* "Name" gives the name of the application for which the command is
* intended. This option must be present.
*
* -E encoding
* Encoding name used for the text. This is the 'encoding' of the
* sender. The receiver may want to do conversion to his 'encoding'.
*
* -s script
* "Script" is the script to be executed. This option must be
* present. Taken as a series of keystrokes in a "k" command where
* <Key>'s are expanded
*
* The options may appear in any order. The -n and -s options must be
* present, but -r may be omitted for asynchronous RPCs. For compatibility
* with future releases that may add new features, there may be additional
* options present; as long as they start with a "-" character, they will
* be ignored.
*
* A result also consists of a zero character followed by several null-
* terminated ASCII strings. The first string consists of the single
* letter "r". Subsequent strings have the form "option value" where
* the following options are supported:
*
* -s serial
* Identifies the command for which this is the result. It is the
* same as the "serial" field from the -s option in the command. This
* option must be present.
*
* -r result
* "Result" is the result string for the script, which may be either
* a result or an error message. If this field is omitted then it
* defaults to an empty string.
*
* -c code
* 0: for OK. This is the default.
* 1: for error: Result is the last error
*
* -i errorInfo
* -e errorCode
* Not applicable for Vim
*
* Options may appear in any order, and only the -s option must be
* present. As with commands, there may be additional options besides
* these; unknown options are ignored.
*/
/*
* Maximum size property that can be read at one time by
* this module:
*/
#define MAX_PROP_WORDS 100000
struct ServerReply
{
Window id;
garray_T strings;
};
static garray_T serverReply = { 0, 0, 0, 0, 0 };
enum ServerReplyOp { SROP_Find, SROP_Add, SROP_Delete };
typedef int (*EndCond)(void *);
struct x_cmdqueue
{
char_u *propInfo;
long_u len;
struct x_cmdqueue *next;
struct x_cmdqueue *prev;
};
typedef struct x_cmdqueue x_queue_T;
/* dummy node, header for circular queue */
static x_queue_T head = {NULL, 0, NULL, NULL};
/*
* Forward declarations for procedures defined later in this file:
*/
static Window LookupName(Display *dpy, char_u *name, int delete, char_u **loose);
static int SendInit(Display *dpy);
static int DoRegisterName(Display *dpy, char_u *name);
static void DeleteAnyLingerer(Display *dpy, Window w);
static int GetRegProp(Display *dpy, char_u **regPropp, long_u *numItemsp, int domsg);
static int WaitForPend(void *p);
static int WaitForReply(void *p);
static int WindowValid(Display *dpy, Window w);
static void ServerWait(Display *dpy, Window w, EndCond endCond, void *endData, int localLoop, int seconds);
static struct ServerReply *ServerReplyFind(Window w, enum ServerReplyOp op);
static int AppendPropCarefully(Display *display, Window window, Atom property, char_u *value, int length);
static int x_error_check(Display *dpy, XErrorEvent *error_event);
static int IsSerialName(char_u *name);
static void save_in_queue(char_u *buf, long_u len);
static void server_parse_message(Display *dpy, char_u *propInfo, long_u numItems);
/* Private variables for the "server" functionality */
static Atom registryProperty = None;
static Atom vimProperty = None;
static int got_x_error = FALSE;
static char_u *empty_prop = (char_u *)""; /* empty GetRegProp() result */
/*
* Associate an ASCII name with Vim. Try real hard to get a unique one.
* Returns FAIL or OK.
*/
int
serverRegisterName(
Display *dpy, /* display to register with */
char_u *name) /* the name that will be used as a base */
{
int i;
int res;
char_u *p = NULL;
res = DoRegisterName(dpy, name);
if (res < 0)
{
i = 1;
do
{
if (res < -1 || i >= 1000)
{
MSG_ATTR(_("Unable to register a command server name"),
HL_ATTR(HLF_W));
return FAIL;
}
if (p == NULL)
p = alloc(STRLEN(name) + 10);
if (p == NULL)
{
res = -10;
continue;
}
sprintf((char *)p, "%s%d", name, i++);
res = DoRegisterName(dpy, p);
}
while (res < 0)
;
vim_free(p);
}
return OK;
}
static int
DoRegisterName(Display *dpy, char_u *name)
{
Window w;
XErrorHandler old_handler;
#define MAX_NAME_LENGTH 100
char_u propInfo[MAX_NAME_LENGTH + 20];
if (commProperty == None)
{
if (SendInit(dpy) < 0)
return -2;
}
/*
* Make sure the name is unique, and append info about it to
* the registry property. It's important to lock the server
* here to prevent conflicting changes to the registry property.
* WARNING: Do not step through this while debugging, it will hangup the X
* server!
*/
XGrabServer(dpy);
w = LookupName(dpy, name, FALSE, NULL);
if (w != (Window)0)
{
Status status;
int dummyInt;
unsigned int dummyUns;
Window dummyWin;
/*
* The name is currently registered. See if the commWindow
* associated with the name exists. If not, or if the commWindow
* is *our* commWindow, then just unregister the old name (this
* could happen if an application dies without cleaning up the
* registry).
*/
old_handler = XSetErrorHandler(x_error_check);
status = XGetGeometry(dpy, w, &dummyWin, &dummyInt, &dummyInt,
&dummyUns, &dummyUns, &dummyUns, &dummyUns);
(void)XSetErrorHandler(old_handler);
if (status != Success && w != commWindow)
{
XUngrabServer(dpy);
XFlush(dpy);
return -1;
}
(void)LookupName(dpy, name, /*delete=*/TRUE, NULL);
}
sprintf((char *)propInfo, "%x %.*s", (int_u)commWindow,
MAX_NAME_LENGTH, name);
old_handler = XSetErrorHandler(x_error_check);
got_x_error = FALSE;
XChangeProperty(dpy, RootWindow(dpy, 0), registryProperty, XA_STRING, 8,
PropModeAppend, propInfo, STRLEN(propInfo) + 1);
XUngrabServer(dpy);
XSync(dpy, False);
(void)XSetErrorHandler(old_handler);
if (!got_x_error)
{
#ifdef FEAT_EVAL
set_vim_var_string(VV_SEND_SERVER, name, -1);
#endif
serverName = vim_strsave(name);
#ifdef FEAT_TITLE
need_maketitle = TRUE;
#endif
return 0;
}
return -2;
}
#if defined(FEAT_GUI) || defined(PROTO)
/*
* Clean out new ID from registry and set it as comm win.
* Change any registered window ID.
*/
void
serverChangeRegisteredWindow(
Display *dpy, /* Display to register with */
Window newwin) /* Re-register to this ID */
{
char_u propInfo[MAX_NAME_LENGTH + 20];
commWindow = newwin;
/* Always call SendInit() here, to make sure commWindow is marked as a Vim
* window. */
if (SendInit(dpy) < 0)
return;
/* WARNING: Do not step through this while debugging, it will hangup the X
* server! */
XGrabServer(dpy);
DeleteAnyLingerer(dpy, newwin);
if (serverName != NULL)
{
/* Reinsert name if we was already registered */
(void)LookupName(dpy, serverName, /*delete=*/TRUE, NULL);
sprintf((char *)propInfo, "%x %.*s",
(int_u)newwin, MAX_NAME_LENGTH, serverName);
XChangeProperty(dpy, RootWindow(dpy, 0), registryProperty, XA_STRING, 8,
PropModeAppend, (char_u *)propInfo,
STRLEN(propInfo) + 1);
}
XUngrabServer(dpy);
}
#endif
/*
* Send to an instance of Vim via the X display.
* Returns 0 for OK, negative for an error.
*/
int
serverSendToVim(
Display *dpy, /* Where to send. */
char_u *name, /* Where to send. */
char_u *cmd, /* What to send. */
char_u **result, /* Result of eval'ed expression */
Window *server, /* Actual ID of receiving app */
Bool asExpr, /* Interpret as keystrokes or expr ? */
int timeout, /* seconds to wait or zero */
Bool localLoop, /* Throw away everything but result */
int silent) /* don't complain about no server */
{
Window w;
char_u *property;
int length;
int res;
static int serial = 0; /* Running count of sent commands.
* Used to give each command a
* different serial number. */
PendingCommand pending;
char_u *loosename = NULL;
if (result != NULL)
*result = NULL;
if (name == NULL || *name == NUL)
name = (char_u *)"GVIM"; /* use a default name */
if (commProperty == None && dpy != NULL)
{
if (SendInit(dpy) < 0)
return -1;
}
/* Execute locally if no display or target is ourselves */
if (dpy == NULL || (serverName != NULL && STRICMP(name, serverName) == 0))
return sendToLocalVim(cmd, asExpr, result);
/*
* Bind the server name to a communication window.
*
* Find any survivor with a serialno attached to the name if the
* original registrant of the wanted name is no longer present.
*
* Delete any lingering names from dead editors.
*/
while (TRUE)
{
w = LookupName(dpy, name, FALSE, &loosename);
/* Check that the window is hot */
if (w != None)
{
if (!WindowValid(dpy, w))
{
LookupName(dpy, loosename ? loosename : name,
/*DELETE=*/TRUE, NULL);
vim_free(loosename);
continue;
}
}
break;
}
if (w == None)
{
if (!silent)
EMSG2(_(e_noserver), name);
return -1;
}
else if (loosename != NULL)
name = loosename;
if (server != NULL)
*server = w;
/*
* Send the command to target interpreter by appending it to the
* comm window in the communication window.
* Length must be computed exactly!
*/
#ifdef FEAT_MBYTE
length = STRLEN(name) + STRLEN(p_enc) + STRLEN(cmd) + 14;
#else
length = STRLEN(name) + STRLEN(cmd) + 10;
#endif
property = (char_u *)alloc((unsigned)length + 30);
#ifdef FEAT_MBYTE
sprintf((char *)property, "%c%c%c-n %s%c-E %s%c-s %s",
0, asExpr ? 'c' : 'k', 0, name, 0, p_enc, 0, cmd);
#else
sprintf((char *)property, "%c%c%c-n %s%c-s %s",
0, asExpr ? 'c' : 'k', 0, name, 0, cmd);
#endif
if (name == loosename)
vim_free(loosename);
/* Add a back reference to our comm window */
serial++;
sprintf((char *)property + length, "%c-r %x %d",
0, (int_u)commWindow, serial);
/* Add length of what "-r %x %d" resulted in, skipping the NUL. */
length += STRLEN(property + length + 1) + 1;
res = AppendPropCarefully(dpy, w, commProperty, property, length + 1);
vim_free(property);
if (res < 0)
{
EMSG(_("E248: Failed to send command to the destination program"));
return -1;
}
if (!asExpr) /* There is no answer for this - Keys are sent async */
return 0;
/*
* Register the fact that we're waiting for a command to
* complete (this is needed by SendEventProc and by
* AppendErrorProc to pass back the command's results).
*/
pending.serial = serial;
pending.code = 0;
pending.result = NULL;
pending.nextPtr = pendingCommands;
pendingCommands = &pending;
ServerWait(dpy, w, WaitForPend, &pending, localLoop,
timeout > 0 ? timeout : 600);
/*
* Unregister the information about the pending command
* and return the result.
*/
if (pendingCommands == &pending)
pendingCommands = pending.nextPtr;
else
{
PendingCommand *pcPtr;
for (pcPtr = pendingCommands; pcPtr != NULL; pcPtr = pcPtr->nextPtr)
if (pcPtr->nextPtr == &pending)
{
pcPtr->nextPtr = pending.nextPtr;
break;
}
}
if (result != NULL)
*result = pending.result;
else
vim_free(pending.result);
return pending.code == 0 ? 0 : -1;
}
static int
WaitForPend(void *p)
{
PendingCommand *pending = (PendingCommand *) p;
return pending->result != NULL;
}
/*
* Return TRUE if window "w" exists and has a "Vim" property on it.
*/
static int
WindowValid(Display *dpy, Window w)
{
XErrorHandler old_handler;
Atom *plist;
int numProp;
int i;
old_handler = XSetErrorHandler(x_error_check);
got_x_error = 0;
plist = XListProperties(dpy, w, &numProp);
XSync(dpy, False);
XSetErrorHandler(old_handler);
if (plist == NULL || got_x_error)
return FALSE;
for (i = 0; i < numProp; i++)
if (plist[i] == vimProperty)
{
XFree(plist);
return TRUE;
}
XFree(plist);
return FALSE;
}
/*
* Enter a loop processing X events & polling chars until we see a result
*/
static void
ServerWait(
Display *dpy,
Window w,
EndCond endCond,
void *endData,
int localLoop,
int seconds)
{
time_t start;
time_t now;
XEvent event;
#define UI_MSEC_DELAY 50
#define SEND_MSEC_POLL 500
#ifndef HAVE_SELECT
struct pollfd fds;
fds.fd = ConnectionNumber(dpy);
fds.events = POLLIN;
#else
fd_set fds;
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = SEND_MSEC_POLL * 1000;
FD_ZERO(&fds);
FD_SET(ConnectionNumber(dpy), &fds);
#endif
time(&start);
while (TRUE)
{
while (XCheckWindowEvent(dpy, commWindow, PropertyChangeMask, &event))
serverEventProc(dpy, &event, 1);
server_parse_messages();
if (endCond(endData) != 0)
break;
if (!WindowValid(dpy, w))
break;
time(&now);
if (seconds >= 0 && (now - start) >= seconds)
break;
#ifdef FEAT_TIMERS
check_due_timer();
#endif
/* Just look out for the answer without calling back into Vim */
if (localLoop)
{
#ifndef HAVE_SELECT
if (poll(&fds, 1, SEND_MSEC_POLL) < 0)
break;
#else
if (select(FD_SETSIZE, &fds, NULL, NULL, &tv) < 0)
break;
#endif
}
else
{
if (got_int)
break;
ui_delay((long)UI_MSEC_DELAY, TRUE);
ui_breakcheck();
}
}
}
/*
* Fetch a list of all the Vim instance names currently registered for the
* display.
*
* Returns a newline separated list in allocated memory or NULL.
*/
char_u *
serverGetVimNames(Display *dpy)
{
char_u *regProp;
char_u *entry;
char_u *p;
long_u numItems;
int_u w;
garray_T ga;
if (registryProperty == None)
{
if (SendInit(dpy) < 0)
return NULL;
}
/*
* Read the registry property.
*/
if (GetRegProp(dpy, ®Prop, &numItems, TRUE) == FAIL)
return NULL;
/*
* Scan all of the names out of the property.
*/
ga_init2(&ga, 1, 100);
for (p = regProp; (long_u)(p - regProp) < numItems; p++)
{
entry = p;
while (*p != 0 && !isspace(*p))
p++;
if (*p != 0)
{
w = None;
sscanf((char *)entry, "%x", &w);
if (WindowValid(dpy, (Window)w))
{
ga_concat(&ga, p + 1);
ga_concat(&ga, (char_u *)"\n");
}
while (*p != 0)
p++;
}
}
if (regProp != empty_prop)
XFree(regProp);
ga_append(&ga, NUL);
return ga.ga_data;
}
/* ----------------------------------------------------------
* Reply stuff
*/
static struct ServerReply *
ServerReplyFind(Window w, enum ServerReplyOp op)
{
struct ServerReply *p;
struct ServerReply e;
int i;
p = (struct ServerReply *) serverReply.ga_data;
for (i = 0; i < serverReply.ga_len; i++, p++)
if (p->id == w)
break;
if (i >= serverReply.ga_len)
p = NULL;
if (p == NULL && op == SROP_Add)
{
if (serverReply.ga_growsize == 0)
ga_init2(&serverReply, sizeof(struct ServerReply), 1);
if (ga_grow(&serverReply, 1) == OK)
{
p = ((struct ServerReply *) serverReply.ga_data)
+ serverReply.ga_len;
e.id = w;
ga_init2(&e.strings, 1, 100);
mch_memmove(p, &e, sizeof(e));
serverReply.ga_len++;
}
}
else if (p != NULL && op == SROP_Delete)
{
ga_clear(&p->strings);
mch_memmove(p, p + 1, (serverReply.ga_len - i - 1) * sizeof(*p));
serverReply.ga_len--;
}
return p;
}
/*
* Convert string to windowid.
* Issue an error if the id is invalid.
*/
Window
serverStrToWin(char_u *str)
{
unsigned id = None;
sscanf((char *)str, "0x%x", &id);
if (id == None)
EMSG2(_("E573: Invalid server id used: %s"), str);
return (Window)id;
}
/*
* Send a reply string (notification) to client with id "name".
* Return -1 if the window is invalid.
*/
int
serverSendReply(char_u *name, char_u *str)
{
char_u *property;
int length;
int res;
Display *dpy = X_DISPLAY;
Window win = serverStrToWin(name);
if (commProperty == None)
{
if (SendInit(dpy) < 0)
return -2;
}
if (!WindowValid(dpy, win))
return -1;
#ifdef FEAT_MBYTE
length = STRLEN(p_enc) + STRLEN(str) + 14;
#else
length = STRLEN(str) + 10;
#endif
if ((property = (char_u *)alloc((unsigned)length + 30)) != NULL)
{
#ifdef FEAT_MBYTE
sprintf((char *)property, "%cn%c-E %s%c-n %s%c-w %x",
0, 0, p_enc, 0, str, 0, (unsigned int)commWindow);
#else
sprintf((char *)property, "%cn%c-n %s%c-w %x",
0, 0, str, 0, (unsigned int)commWindow);
#endif
/* Add length of what "%x" resulted in. */
length += STRLEN(property + length);
res = AppendPropCarefully(dpy, win, commProperty, property, length + 1);
vim_free(property);
return res;
}
return -1;
}
static int
WaitForReply(void *p)
{
Window *w = (Window *) p;
return ServerReplyFind(*w, SROP_Find) != NULL;
}
/*
* Wait for replies from id (win)
* When "timeout" is non-zero wait up to this many seconds.
* Return 0 and the malloc'ed string when a reply is available.
* Return -1 if the window becomes invalid while waiting.
*/
int
serverReadReply(
Display *dpy,
Window win,
char_u **str,
int localLoop,
int timeout)
{
int len;
char_u *s;
struct ServerReply *p;
ServerWait(dpy, win, WaitForReply, &win, localLoop,
timeout > 0 ? timeout : -1);
if ((p = ServerReplyFind(win, SROP_Find)) != NULL && p->strings.ga_len > 0)
{
*str = vim_strsave(p->strings.ga_data);
len = STRLEN(*str) + 1;
if (len < p->strings.ga_len)
{
s = (char_u *) p->strings.ga_data;
mch_memmove(s, s + len, p->strings.ga_len - len);
p->strings.ga_len -= len;
}
else
{
/* Last string read. Remove from list */
ga_clear(&p->strings);
ServerReplyFind(win, SROP_Delete);
}
return 0;
}
return -1;
}
/*
* Check for replies from id (win).
* Return TRUE and a non-malloc'ed string if there is. Else return FALSE.
*/
int
serverPeekReply(Display *dpy, Window win, char_u **str)
{
struct ServerReply *p;
if ((p = ServerReplyFind(win, SROP_Find)) != NULL && p->strings.ga_len > 0)
{
if (str != NULL)
*str = p->strings.ga_data;
return 1;
}
if (!WindowValid(dpy, win))
return -1;
return 0;
}
/*
* Initialize the communication channels for sending commands and receiving
* results.
*/
static int
SendInit(Display *dpy)
{
XErrorHandler old_handler;
/*
* Create the window used for communication, and set up an
* event handler for it.
*/
old_handler = XSetErrorHandler(x_error_check);
got_x_error = FALSE;
if (commProperty == None)
commProperty = XInternAtom(dpy, "Comm", False);
if (vimProperty == None)
vimProperty = XInternAtom(dpy, "Vim", False);
if (registryProperty == None)
registryProperty = XInternAtom(dpy, "VimRegistry", False);
if (commWindow == None)
{
commWindow = XCreateSimpleWindow(dpy, XDefaultRootWindow(dpy),
getpid(), 0, 10, 10, 0,
WhitePixel(dpy, DefaultScreen(dpy)),
WhitePixel(dpy, DefaultScreen(dpy)));
XSelectInput(dpy, commWindow, PropertyChangeMask);
/* WARNING: Do not step through this while debugging, it will hangup
* the X server! */
XGrabServer(dpy);
DeleteAnyLingerer(dpy, commWindow);
XUngrabServer(dpy);
}
/* Make window recognizable as a vim window */
XChangeProperty(dpy, commWindow, vimProperty, XA_STRING,
8, PropModeReplace, (char_u *)VIM_VERSION_SHORT,
(int)STRLEN(VIM_VERSION_SHORT) + 1);
XSync(dpy, False);
(void)XSetErrorHandler(old_handler);
return got_x_error ? -1 : 0;
}
/*
* Given a server name, see if the name exists in the registry for a
* particular display.
*
* If the given name is registered, return the ID of the window associated
* with the name. If the name isn't registered, then return 0.
*
* Side effects:
* If the registry property is improperly formed, then it is deleted.
* If "delete" is non-zero, then if the named server is found it is
* removed from the registry property.
*/
static Window
LookupName(
Display *dpy, /* Display whose registry to check. */
char_u *name, /* Name of a server. */
int delete, /* If non-zero, delete info about name. */
char_u **loose) /* Do another search matching -999 if not found
Return result here if a match is found */
{
char_u *regProp, *entry;
char_u *p;
long_u numItems;
int_u returnValue;
/*
* Read the registry property.
*/
if (GetRegProp(dpy, ®Prop, &numItems, FALSE) == FAIL)
return 0;
/*
* Scan the property for the desired name.
*/
returnValue = (int_u)None;
entry = NULL; /* Not needed, but eliminates compiler warning. */
for (p = regProp; (long_u)(p - regProp) < numItems; )
{
entry = p;
while (*p != 0 && !isspace(*p))
p++;
if (*p != 0 && STRICMP(name, p + 1) == 0)
{
sscanf((char *)entry, "%x", &returnValue);
break;
}
while (*p != 0)
p++;
p++;
}
if (loose != NULL && returnValue == (int_u)None && !IsSerialName(name))
{
for (p = regProp; (long_u)(p - regProp) < numItems; )
{
entry = p;
while (*p != 0 && !isspace(*p))
p++;
if (*p != 0 && IsSerialName(p + 1)
&& STRNICMP(name, p + 1, STRLEN(name)) == 0)
{
sscanf((char *)entry, "%x", &returnValue);
*loose = vim_strsave(p + 1);
break;
}
while (*p != 0)
p++;
p++;
}
}
/*
* Delete the property, if that is desired (copy down the
* remainder of the registry property to overlay the deleted
* info, then rewrite the property).
*/
if (delete && returnValue != (int_u)None)
{
int count;
while (*p != 0)
p++;
p++;
count = numItems - (p - regProp);
if (count > 0)
mch_memmove(entry, p, count);
XChangeProperty(dpy, RootWindow(dpy, 0), registryProperty, XA_STRING,
8, PropModeReplace, regProp,
(int)(numItems - (p - entry)));
XSync(dpy, False);
}
if (regProp != empty_prop)
XFree(regProp);
return (Window)returnValue;
}