/**/

#define _GNU_SOURCE
#include <dlfcn.h>
#include <stdio.h>
#include <unistd.h>

#define STDERRSTR_CONST(m) write(2,m,sizeof(m)-1)
#define STDERRSTR_STRING(m) write(2,m,strlen(m))

static anyfn_type *find_any(const char *name) {
  static const char *dlerr;
  anyfn_type *kv;

  kv= dlsym(RTLD_NEXT,name); if (kv) return kv;
  dlerr= dlerror(); if (!dlerr) dlerr= "dlsym() failed for no reason";
  STDERRSTR_CONST("pctb-preload-wrap: error finding original version of ");
  STDERRSTR_STRING(name);
  STDERRSTR_CONST(": ");
  STDERRSTR_STRING(dlerr);
  STDERRSTR_STRING("\n");
  errno= ENOSYS;
  return 0;
}

typedef int
execvefn_type(const char *path, char *const argv[], char *const envp[]);

static execvefn_type find_execve, *old_execve= find_execve;

static int find_execve(const char *path,
		       char *const argv[], char *const envp[]) {
  anyfn_type *anyfn;
  anyfn= find_any("execve"); if (!anyfn) return -1;
  old_execve= (execvefn_type*)anyfn;
  return old_execve(path, argv, envp);
}

static const char javatail[]= "/bin/java";

int execve(const char *path, char *const argv[], char *const envp[]) {
  int pathlen= strlen(path);
  if (pathlen < (sizeof(path2extdir_rm)-1) ||
      strcmp(javatail, path + pathlen-(sizeof(path2extdir_rm)-1)))
    old_execve(opath, oargv, oenvp);
  

  

  int oargc;



  xassert(opathlen >= 
  

  for (oargc=0; oargv[oargc]; oargc++);
  xassert(oargc);
  if (strcmp(oargv[oargc-1], "com.threerings.yohoho.client.YoApp"))

  /* Remove ourselves from LD_PRELOAD */
  int ipreloadenv=-1;
  const char ldpreload[]= "LD_PRELOAD=";
  for (oenvc=0; oenvp[oenvc]; oenvc++) {
    if (memcmp(oenvp[oenvc], ldpreload, sizeof(ldpreload)-1)) continue;
    xassert(ipreloadenv==-1);
    ipreloadenv= oenvc;
  }
  xassert(ipreloadenv>=0);
  xassert(!strchr(':',oenvp[ipreloadenv]));
  

  int nargc= oargc+2;
  char **nargv= xmalloc(sizeof(*nargv) * (nargc+1));

  /* Add argument for accessibility assistive tech. */
  int iargc= oargc-1;
  memcpy(nargv, oargv, iargc);
  nargv[iargc++]= "-Djavax.accessibility.assistive_technologies="
    "com.tedpearson.ypp.market.MarketUploader";

  /* Calculate and add argument for ext dirs containing our jars */
  const char *nextdir;
  xassert((nextdir= getenv("JPCTB_EXTDIR")));
  int nextdirlen= strlen(nextdir);

  int njvmextdirbaselen= opathlen-sizeof(path2extdir_rm)-1);
  xassert(!strcmp(path2extdir_rm, opath+njvmextdirbaselen);

  const char path2extdir_pfx[]= "-Djava.ext.dirs=";
  const char path2extdir_sfx[]= "/lib/ext";

#define STRS(STR,DL)						\
      STR( path2extdir_pfx, sizeof(path2extdir_pfx)-1 )	DL	\
      STR( nextdir,         nextdirlen                )	DL	\
      STR( ":",             1                         )	DL	\
      STR( opath,           njvmextdirbaselen         )	DL	\
      STR( path2extdir_sfx, sizeof(path2extdir_sfx)-1 )	DL	\
      STR( "",              1                         )

#define STR_LEN(str,len) (len)
  char *nextdirarg= xmalloc(STRS(STR_LEN, +));
  char *p= nextdirarg;

#define STR_ADD(str,len) \
  memcpy(p,(str),(len)); p += (len);
  STRS(STR_ADD, ;);

  nargv[iargc++]= nextdirarg;

  /* Remaining argument: the class */
  nargv[iargc++]= oargv[oargc-1];

 



    if (arg
}