1178 }

  1179 

  1180 static bool file_exists(const char* filename) {

  1181   if (filename == NULL || strlen(filename) == 0) {

  1182     return false;

  1183   }

  1184   return GetFileAttributes(filename) != INVALID_FILE_ATTRIBUTES;

  1185 }

  1186 

  1187 bool os::dll_build_name(char *buffer, size_t buflen,

  1188                         const char* pname, const char* fname) {

  1189   bool retval = false;

  1190   const size_t pnamelen = pname ? strlen(pname) : 0;

  1191   const char c = (pnamelen > 0) ? pname[pnamelen-1] : 0;

  1192 

  1193   // Return error on buffer overflow.

  1194   if (pnamelen + strlen(fname) + 10 > buflen) {

  1195     return retval;

  1196   }

  1197 

  1198   if (pnamelen == 0) {

  1199     jio_snprintf(buffer, buflen, "%s.dll", fname);

  1200     retval = true;

  1201   } else if (c == ':' || c == '\\') {

  1202     jio_snprintf(buffer, buflen, "%s%s.dll", pname, fname);

  1203     retval = true;

  1204   } else if (strchr(pname, *os::path_separator()) != NULL) {

  1205     int n;

  1206     char** pelements = split_path(pname, &n);

  1207     if (pelements == NULL) {

  1208       return false;

  1209     }

  1210     for (int i = 0; i < n; i++) {

  1211       char* path = pelements[i];

  1212       // Really shouldn't be NULL, but check can't hurt

  1213       size_t plen = (path == NULL) ? 0 : strlen(path);

  1214       if (plen == 0) {

  1215         continue; // skip the empty path values

  1216       }

  1217       const char lastchar = path[plen - 1];

  1218       if (lastchar == ':' || lastchar == '\\') {

  1219         jio_snprintf(buffer, buflen, "%s%s.dll", path, fname);

  1220       } else {

  1221         jio_snprintf(buffer, buflen, "%s\\%s.dll", path, fname);

  1222       }

  1223       if (file_exists(buffer)) {

  1224         retval = true;

  1225         break;

  1226       }

  1227     }

  1228     // release the storage

  1229     for (int i = 0; i < n; i++) {

  1230       if (pelements[i] != NULL) {

  1231         FREE_C_HEAP_ARRAY(char, pelements[i]);

  1232       }

  1233     }

  1234     if (pelements != NULL) {

  1235       FREE_C_HEAP_ARRAY(char*, pelements);

  1236     }

  1237   } else {

  1238     jio_snprintf(buffer, buflen, "%s\\%s.dll", pname, fname);

  1239     retval = true;

  1240   }

  1241   return retval;