char *__PHYSFS_platformCalcBaseDir(const char *argv0)
{
char *retval = NULL;
char *envr = NULL;
/* fast path: default behaviour can handle this. */
if ( (argv0 != NULL) && (strchr(argv0, '/') != NULL) )
return(NULL); /* higher level will parse out real path from argv0. */
/*
* Try to avoid using argv0 unless forced to. If there's a Linux-like
* /proc filesystem, you can get the full path to the current process from
* the /proc/self/exe symlink.
*/
retval = readSymLink("/proc/self/exe");
if (retval == NULL)
{
/* older kernels don't have /proc/self ... try PID version... */
const unsigned long long pid = (unsigned long long) getpid();
char path[64];
const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
if ( (rc > 0) && (rc < sizeof(path)) )
retval = readSymLink(path);
} /* if */
if (retval != NULL) /* chop off filename. */
{
char *ptr = strrchr(retval, '/');
if (ptr != NULL)
*ptr = '\0';
} /* if */
if ((retval == NULL) && (argv0 != NULL))
{
/* If there's no dirsep on argv0, then look through $PATH for it. */
envr = __PHYSFS_platformCopyEnvironmentVariable("PATH");
BAIL_IF_MACRO(!envr, NULL, NULL);
retval = findBinaryInPath(argv0, envr);
allocator.Free(envr);
} /* if */
if (retval != NULL)
{
/* try to shrink buffer... */
char *ptr = (char *) allocator.Realloc(retval, strlen(retval) + 1);
if (ptr != NULL)
retval = ptr; /* oh well if it failed. */
} /* if */
return(retval);
} /* __PHYSFS_platformCalcBaseDir */
char *__PHYSFS_platformCalcBaseDir(const char *argv0)
{
char *retval = NULL;
const char *envr = NULL;
/* Try to avoid using argv0 unless forced to. Try system-specific stuff. */
#if PHYSFS_PLATFORM_FREEBSD
{
char fullpath[PATH_MAX];
size_t buflen = sizeof (fullpath);
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
if (sysctl(mib, 4, fullpath, &buflen, NULL, 0) != -1)
retval = __PHYSFS_strdup(fullpath);
}
#elif PHYSFS_PLATFORM_SOLARIS
{
const char *path = getexecname();
if ((path != NULL) && (path[0] == '/')) /* must be absolute path... */
retval = __PHYSFS_strdup(path);
}
#endif
if (retval)
return retval; /* already got it. */
/* If there's a Linux-like /proc filesystem, you can get the full path to
* the current process from a symlink in there.
*/
if (access("/proc", F_OK) == 0)
{
retval = readSymLink("/proc/self/exe");
if (!retval) retval = readSymLink("/proc/curproc/file");
if (!retval) retval = readSymLink("/proc/curproc/exe");
if (retval == NULL)
{
/* older kernels don't have /proc/self ... try PID version... */
const unsigned long long pid = (unsigned long long) getpid();
char path[64];
const int rc = (int) snprintf(path,sizeof(path),"/proc/%llu/exe",pid);
if ( (rc > 0) && (rc < sizeof(path)) )
retval = readSymLink(path);
} /* if */
} /* if */
if (retval != NULL) /* chop off filename. */
{
char *ptr = strrchr(retval, '/');
if (ptr != NULL)
*(ptr+1) = '\0';
else /* shouldn't happen, but just in case... */
{
physfs_alloc.Free(retval);
retval = NULL;
} /* else */
} /* if */
/* No /proc/self/exe, etc, but we have an argv[0] we can parse? */
if ((retval == NULL) && (argv0 != NULL))
{
/* fast path: default behaviour can handle this. */
if (strchr(argv0, '/') != NULL)
return NULL; /* higher level parses out real path from argv0. */
/* If there's no dirsep on argv0, then look through $PATH for it. */
envr = getenv("PATH");
if (envr != NULL)
{
char *path = (char *) __PHYSFS_smallAlloc(strlen(envr) + 1);
BAIL_IF_MACRO(!path, PHYSFS_ERR_OUT_OF_MEMORY, NULL);
strcpy(path, envr);
retval = findBinaryInPath(argv0, path);
__PHYSFS_smallFree(path);
} /* if */
} /* if */
if (retval != NULL)
{
/* try to shrink buffer... */
char *ptr = (char *) physfs_alloc.Realloc(retval, strlen(retval) + 1);
if (ptr != NULL)
retval = ptr; /* oh well if it failed. */
} /* if */
return retval;
} /* __PHYSFS_platformCalcBaseDir */
