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/* vi:set ts=8 sts=4 sw=4:
*
* VIM - Vi IMproved by Bram Moolenaar
* X-Windows communication 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.
*
* Client for sending commands to an '+xcmdsrv' enabled vim.
* This is mostly a de-Vimified version of if_xcmdsrv.c in vim.
* See that file for a protocol specification.
*
* You can make a test program with a Makefile like:
* xcmdsrv_client: xcmdsrv_client.c
* cc -o $@ -g -DMAIN -I/usr/X11R6/include -L/usr/X11R6/lib $< -lX11
*
*/
#include <stdio.h>
#include <string.h>
#ifdef HAVE_SELECT
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#else
#include <sys/poll.h>
#endif
#include <X11/Intrinsic.h>
#include <X11/Xatom.h>
#define __ARGS(x) x
/* Client API */
char * sendToVim __ARGS((Display *dpy, char *name, char *cmd, int asKeys, int *code));
#ifdef MAIN
/* A sample program */
main(int argc, char **argv)
{
char *res;
int code;
if (argc == 4)
{
if ((res = sendToVim(XOpenDisplay(NULL), argv[2], argv[3],
argv[1][0] != 'e', &code)) != NULL)
{
if (code)
printf("Error code returned: %d\n", code);
puts(res);
}
exit(0);
}
else
fprintf(stderr, "Usage: %s {k|e} <server> <command>", argv[0]);
exit(1);
}
#endif
/*
* Maximum size property that can be read at one time by
* this module:
*/
#define MAX_PROP_WORDS 100000
/*
* Forward declarations for procedures defined later in this file:
*/
static int x_error_check __ARGS((Display *dpy, XErrorEvent *error_event));
static int AppendPropCarefully __ARGS((Display *display,
Window window, Atom property, char *value, int length));
static Window LookupName __ARGS((Display *dpy, char *name,
int delete, char **loose));
static int SendInit __ARGS((Display *dpy));
static char *SendEventProc __ARGS((Display *dpy, XEvent *eventPtr,
int expect, int *code));
static int IsSerialName __ARGS((char *name));
/* Private variables */
static Atom registryProperty = None;
static Atom commProperty = None;
static Window commWindow = None;
static int got_x_error = FALSE;
/*
* sendToVim --
* Send to an instance of Vim via the X display.
*
* Results:
* A string with the result or NULL. Caller must free if non-NULL
*/
char *
sendToVim(dpy, name, cmd, asKeys, code)
Display *dpy; /* Where to send. */
char *name; /* Where to send. */
char *cmd; /* What to send. */
int asKeys; /* Interpret as keystrokes or expr ? */
int *code; /* Return code. 0 => OK */
{
Window w;
Atom *plist;
XErrorHandler old_handler;
#define STATIC_SPACE 500
char *property, staticSpace[STATIC_SPACE];
int length;
int res;
static int serial = 0; /* Running count of sent commands.
* Used to give each command a
* different serial number. */
XEvent event;
XPropertyEvent *e = (XPropertyEvent *)&event;
time_t start;
char *result;
char *loosename = NULL;
if (commProperty == None && dpy != NULL)
{
if (SendInit(dpy) < 0)
return NULL;
}
/*
* 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.
*/
old_handler = XSetErrorHandler(x_error_check);
while (TRUE)
{
got_x_error = FALSE;
w = LookupName(dpy, name, 0, &loosename);
/* Check that the window is hot */
if (w != None)
{
plist = XListProperties(dpy, w, &res);
XSync(dpy, False);
if (plist != NULL)
XFree(plist);
if (got_x_error)
{
LookupName(dpy, loosename ? loosename : name,
/*DELETE=*/TRUE, NULL);
continue;
}
}
break;
}
if (w == None)
{
fprintf(stderr, "no registered server named %s\n", name);
return NULL;
}
else if (loosename != NULL)
name = loosename;
/*
* Send the command to target interpreter by appending it to the
* comm window in the communication window.
*/
length = strlen(name) + strlen(cmd) + 10;
if (length <= STATIC_SPACE)
property = staticSpace;
else
property = (char *) malloc((unsigned) length);
serial++;
sprintf(property, "%c%c%c-n %s%c-s %s",
0, asKeys ? 'k' : 'c', 0, name, 0, cmd);
if (name == loosename)
free(loosename);
if (!asKeys)
{
/* Add a back reference to our comm window */
sprintf(property + length, "%c-r %x %d", 0, (uint) commWindow, serial);
length += strlen(property + length + 1) + 1;
}
res = AppendPropCarefully(dpy, w, commProperty, property, length + 1);
if (length > STATIC_SPACE)
free(property);
if (res < 0)
{
fprintf(stderr, "Failed to send command to the destination program\n");
return NULL;
}
if (asKeys) /* There is no answer for this - Keys are sent async */
return NULL;
/*
* Enter a loop processing X events & pooling chars until we see the result
*/
#define SEND_MSEC_POLL 50
time(&start);
while ((time((time_t *) 0) - start) < 60)
{
/* Look out for the answer */
#ifndef HAVE_SELECT
struct pollfd fds;
fds.fd = ConnectionNumber(dpy);
fds.events = POLLIN;
if (poll(&fds, 1, SEND_MSEC_POLL) < 0)
break;
#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);
if (select(ConnectionNumber(dpy) + 1, &fds, NULL, NULL, &tv) < 0)
break;
#endif
while (XEventsQueued(dpy, QueuedAfterReading) > 0)
{
XNextEvent(dpy, &event);
if (event.type == PropertyNotify && e->window == commWindow)
if ((result = SendEventProc(dpy, &event, serial, code)) != NULL)
return result;
}
}
return NULL;
}
/*
* SendInit --
* This procedure is called to initialize the
* communication channels for sending commands and
* receiving results.
*/
static int
SendInit(dpy)
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;
commProperty = XInternAtom(dpy, "Comm", False);
/* Change this back to "InterpRegistry" to talk to tk processes */
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);
}
XSync(dpy, False);
(void) XSetErrorHandler(old_handler);
return got_x_error ? -1 : 0;
}
/*
* LookupName --
* Given an interpreter name, see if the name exists in
* the interpreter registry for a particular display.
*
* Results:
* 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.
*/
static Window
LookupName(dpy, name, delete, loose)
Display *dpy; /* Display whose registry to check. */
char *name; /* Name of an interpreter. */
int delete; /* If non-zero, delete info about name. */
char **loose; /* Do another search matching -999 if not found
Return result here if a match is found */
{
unsigned char *regProp, *entry;
unsigned char *p;
int result, actualFormat;
unsigned long numItems, bytesAfter;
Atom actualType;
Window returnValue;
/*
* Read the registry property.
*/
regProp = NULL;
result = XGetWindowProperty(dpy, RootWindow(dpy, 0), registryProperty, 0,
MAX_PROP_WORDS, False, XA_STRING, &actualType,
&actualFormat, &numItems, &bytesAfter,
®Prop);
if (actualType == None)
return 0;
/*
* If the property is improperly formed, then delete it.
*/
if ((result != Success) || (actualFormat != 8) || (actualType != XA_STRING))
{
if (regProp != NULL)
XFree(regProp);
XDeleteProperty(dpy, RootWindow(dpy, 0), registryProperty);
return 0;
}
/*
* Scan the property for the desired name.
*/
returnValue = None;
entry = NULL; /* Not needed, but eliminates compiler warning. */
for (p = regProp; (p - regProp) < numItems; )
{
entry = p;
while ((*p != 0) && (!isspace(*p)))
p++;
if ((*p != 0) && (strcasecmp(name, p + 1) == 0))
{
sscanf(entry, "%x", (uint*) &returnValue);
break;
}
while (*p != 0)
p++;
p++;
}
if (loose != NULL && returnValue == None && !IsSerialName(name))
{
for (p = regProp; (p - regProp) < numItems; )
{
entry = p;
while ((*p != 0) && (!isspace(*p)))
p++;
if ((*p != 0) && IsSerialName(p + 1)
&& (strncmp(name, p + 1, strlen(name)) == 0))
{
sscanf(entry, "%x", (uint*) &returnValue);
*loose = strdup(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 != None))
{
int count;
while (*p != 0)
p++;
p++;
count = numItems - (p-regProp);
if (count > 0)
memcpy(entry, p, count);
XChangeProperty(dpy, RootWindow(dpy, 0), registryProperty, XA_STRING,
8, PropModeReplace, regProp,
(int) (numItems - (p-entry)));
XSync(dpy, False);
}
XFree(regProp);
return returnValue;
}
static char *
SendEventProc(dpy, eventPtr, expected, code)
Display *dpy;
XEvent *eventPtr; /* Information about event. */
int expected; /* The one were waiting for */
int *code; /* Return code. 0 => OK */
{
unsigned char *propInfo;
unsigned char *p;
int result, actualFormat;
int retCode;
unsigned long numItems, bytesAfter;
Atom actualType;
if ((eventPtr->xproperty.atom != commProperty)
|| (eventPtr->xproperty.state != PropertyNewValue))
{
return;
}
/*
* Read the comm property and delete it.
*/
propInfo = NULL;
result = XGetWindowProperty(dpy, commWindow, commProperty, 0,
MAX_PROP_WORDS, True, XA_STRING, &actualType,
&actualFormat, &numItems, &bytesAfter,
&propInfo);
/*
* If the property doesn't exist or is improperly formed
* then ignore it.
*/
if ((result != Success) || (actualType != XA_STRING)
|| (actualFormat != 8))
{
if (propInfo != NULL)
{
XFree(propInfo);
}
return;
}
/*
* Several commands and results could arrive in the property at
* one time; each iteration through the outer loop handles a
* single command or result.
*/
for (p = propInfo; (p - propInfo) < numItems; )
{
/*
* Ignore leading NULs; each command or result starts with a
* NUL so that no matter how badly formed a preceding command
* is, we'll be able to tell that a new command/result is
* starting.
*/
if (*p == 0)
{
p++;
continue;
}
if ((*p == 'r') && (p[1] == 0))
{
int serial, gotSerial;
char *res;
/*
* This is a reply to some command that we sent out. Iterate
* over all of its options. Stop when we reach the end of the
* property or something that doesn't look like an option.
*/
p += 2;
gotSerial = 0;
res = "";
retCode = 0;
while (((p-propInfo) < numItems) && (*p == '-'))
{
switch (p[1])
{
case 'r':
if (p[2] == ' ')
res = p + 3;
break;
case 's':
if (sscanf(p + 2, " %d", &serial) == 1)
gotSerial = 1;
break;
case 'c':
if (sscanf(p + 2, " %d", &retCode) != 1)
retCode = 0;
break;
}
while (*p != 0)
p++;
p++;
}
if (!gotSerial)
continue;
if (code != NULL)
*code = retCode;
return serial == expected ? strdup(res) : NULL;
}
else
{
/*
* Didn't recognize this thing. Just skip through the next
* null character and try again.
* Also, throw away commands that we cant process anyway.
*/
while (*p != 0)
p++;
p++;
}
}
XFree(propInfo);
}
/*
* AppendPropCarefully --
*
* Append a given property to a given window, but set up
* an X error handler so that if the append fails this
* procedure can return an error code rather than having
* Xlib panic.
*
* Return:
* 0 on OK - -1 on error
*--------------------------------------------------------------
*/
static int
AppendPropCarefully(dpy, window, property, value, length)
Display *dpy; /* Display on which to operate. */
Window window; /* Window whose property is to
* be modified. */
Atom property; /* Name of property. */
char *value; /* Characters to append to property. */
int length; /* How much to append */
{
XErrorHandler old_handler;
old_handler = XSetErrorHandler(x_error_check);
got_x_error = FALSE;
XChangeProperty(dpy, window, property, XA_STRING, 8,
PropModeAppend, value, length);
XSync(dpy, False);
(void) XSetErrorHandler(old_handler);
return got_x_error ? -1 : 0;
}
/*
* Another X Error handler, just used to check for errors.
*/
/* ARGSUSED */
static int
x_error_check(dpy, error_event)
Display *dpy;
XErrorEvent *error_event;
{
got_x_error = TRUE;
return 0;
}
/*
* Check if "str" looks like it had a serial number appended.
* Actually just checks if the name ends in a digit.
*/
static int
IsSerialName(str)
char *str;
{
int len = strlen(str);
return (len > 1 && isdigit(str[len - 1]));
}
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