1 /*
   2  * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 #include <Windows.h>
  27 #include <io.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <malloc.h>
  31 
  32 void report_error()
  33 {
  34   LPVOID lpMsgBuf;
  35   DWORD dw = GetLastError();
  36 
  37   FormatMessage(
  38       FORMAT_MESSAGE_ALLOCATE_BUFFER |
  39       FORMAT_MESSAGE_FROM_SYSTEM |
  40       FORMAT_MESSAGE_IGNORE_INSERTS,
  41       NULL,
  42       dw,
  43       MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
  44       (LPTSTR) &lpMsgBuf,
  45       0,
  46       NULL);
  47 
  48   fprintf(stderr,
  49           "Could not start process!  Failed with error %d: %s\n",
  50           dw, lpMsgBuf);
  51 
  52   LocalFree(lpMsgBuf);
  53 }
  54 
  55 /*
  56  * Test if pos points to /cygdrive/_/ where _ can
  57  * be any character.
  58  */
  59 int is_cygdrive_here(int pos, char *in, int len)
  60 {
  61   // Length of /cygdrive/c/ is 12
  62   if (pos+12 > len) return 0;
  63   if (in[pos+11]=='/' &&
  64       in[pos+9]=='/' &&
  65       in[pos+8]=='e' &&
  66       in[pos+7]=='v' &&
  67       in[pos+6]=='i' &&
  68       in[pos+5]=='r' &&
  69       in[pos+4]=='d' &&
  70       in[pos+3]=='g' &&
  71       in[pos+2]=='y' &&
  72       in[pos+1]=='c' &&
  73       in[pos+0]=='/') {
  74     return 1;
  75   }
  76   return 0;
  77 }
  78 
  79 /*
  80  * Replace /cygdrive/_/ with _:/
  81  * Works in place since drive letter is always
  82  * shorter than /cygdrive/
  83  */
  84 char *replace_cygdrive_cygwin(char *in)
  85 {
  86   int len = strlen(in);
  87   char *out = malloc(len+1);
  88   int i,j;
  89 
  90   if (len < 12) {
  91     strcpy(out, in);
  92     return out;
  93   }
  94   for (i = 0, j = 0; i<len;) {
  95     if (is_cygdrive_here(i, in, len)) {
  96       out[j++] = in[i+10];
  97       out[j++] = ':';
  98       i+=11;
  99     } else {
 100       out[j] = in[i];
 101       i++;
 102       j++;
 103     }
 104   }
 105   out[j] = 0;
 106   return out;
 107 }
 108 
 109 void append(char **b, size_t *bl, size_t *u, char *add, size_t addlen)
 110 {
 111   while ( (addlen+*u+1) > *bl) {
 112     *bl *= 2;
 113     *b = realloc(*b, *bl);
 114   }
 115   memcpy(*b+*u, add, addlen);
 116   *u += addlen;
 117 }
 118 
 119 /*
 120  * Creates a new string from in where the first occurance of sub is
 121  * replaced by rep.
 122  */
 123 char *replace_substring(char *in, char *sub, char *rep)
 124 {
 125   int in_len = strlen(in);
 126   int sub_len = strlen(sub);
 127   int rep_len = strlen(rep);
 128   char *out = malloc(in_len - sub_len + rep_len + 1);
 129   char *p;
 130 
 131   if (!(p = strstr(in, sub))) {
 132     // If sub isn't a substring of in, just return in.
 133     return in;
 134   }
 135 
 136   // Copy characters from beginning of in to start of sub.
 137   strncpy(out, in, p - in);
 138   out[p - in] = '\0';
 139 
 140   sprintf(out + (p - in), "%s%s", rep, p + sub_len);
 141 
 142   return out;
 143 }
 144 
 145 char* msys_path_list; // @-separated list of paths prefix to look for
 146 char* msys_path_list_end; // Points to last \0 in msys_path_list.
 147 
 148 void setup_msys_path_list(char* argument)
 149 {
 150   char* p;
 151   char* drive_letter_pos;
 152 
 153   msys_path_list = strdup(&argument[2]);
 154   msys_path_list_end = &msys_path_list[strlen(msys_path_list)];
 155 
 156   // Convert all at-sign (@) in path list to \0.
 157   // @ was chosen as separator to minimize risk of other tools messing around with it
 158   p = msys_path_list;
 159   do {
 160     if (p[1] == ':') {
 161       // msys has mangled our path list, restore it from c:/... to /c/...
 162       drive_letter_pos = p+1;
 163       *drive_letter_pos = *p;
 164       *p = '/';
 165     }
 166 
 167     // Look for an @ in the list
 168     p = strchr(p, '@');
 169     if (p != NULL) {
 170       *p = '\0';
 171       p++;
 172     }
 173   } while (p != NULL);
 174 }
 175 
 176 char *replace_cygdrive_msys(char *in)
 177 {
 178   char* str;
 179   char* prefix;
 180   char* p;
 181 
 182   str = strdup(in);
 183 
 184   // For each prefix in the path list, search for it and replace /c/... with c:/...
 185   for (prefix = msys_path_list; prefix < msys_path_list_end && prefix != NULL; prefix += strlen(prefix)+1) {
 186     p=str;
 187     while ((p = strstr(p, prefix))) {
 188       char* drive_letter = p+1;
 189       *p = *drive_letter;
 190       *drive_letter = ':';
 191       p++;
 192     }
 193   }
 194 
 195   return str;
 196 }
 197 
 198 char*(*replace_cygdrive)(char *in) = NULL;
 199 
 200 char *files_to_delete[1024];
 201 int num_files_to_delete = 0;
 202 
 203 char *fix_at_file(char *in)
 204 {
 205   char *tmpdir;
 206   char name[2048];
 207   char *atname;
 208   char *buffer;
 209   size_t buflen=65536;
 210   size_t used=0;
 211   size_t len;
 212   int rc;
 213   FILE *atout;
 214   FILE *atin;
 215   char block[2048];
 216   size_t blocklen;
 217   char *fixed;
 218 
 219   atin = fopen(in+1, "r");
 220   if (atin == NULL) {
 221     fprintf(stderr, "Could not read at file %s\n", in+1);
 222     exit(-1);
 223   }
 224 
 225   tmpdir = getenv("TMP");
 226   if (tmpdir == NULL) {
 227     tmpdir = "c:/cygwin/tmp";
 228   }
 229   _snprintf(name, sizeof(name), "%s\\atfile_XXXXXX", tmpdir);
 230 
 231   rc = _mktemp_s(name, strlen(name)+1);
 232   if (rc) {
 233     fprintf(stderr, "Could not create temporary file name for at file!\n");
 234     exit(-1);
 235   }
 236 
 237   atout = fopen(name, "w");
 238   if (atout == NULL) {
 239     fprintf(stderr, "Could not open temporary file for writing! %s\n", name);
 240     exit(-1);
 241   }
 242 
 243   buffer = malloc(buflen);
 244   while((blocklen = fread(block,1,sizeof(block),atin)) > 0) {
 245     append(&buffer, &buflen, &used, block, blocklen);
 246   }
 247   buffer[used] = 0;
 248   if (getenv("DEBUG_FIXPATH") != NULL) {
 249     fprintf(stderr, "fixpath input from @-file %s: %s\n", &in[1], buffer);
 250   }
 251   fixed = replace_cygdrive(buffer);
 252   if (getenv("DEBUG_FIXPATH") != NULL) {
 253     fprintf(stderr, "fixpath converted to @-file %s is: %s\n", name, fixed);
 254   }
 255   fwrite(fixed, strlen(fixed), 1, atout);
 256   fclose(atin);
 257   fclose(atout);
 258   free(fixed);
 259   free(buffer);
 260   files_to_delete[num_files_to_delete] = malloc(strlen(name)+1);
 261   strcpy(files_to_delete[num_files_to_delete], name);
 262   num_files_to_delete++;
 263   atname = malloc(strlen(name)+2);
 264   atname[0] = '@';
 265   strcpy(atname+1, name);
 266   return atname;
 267 }
 268 
 269 int main(int argc, char **argv)
 270 {
 271     STARTUPINFO si;
 272     PROCESS_INFORMATION pi;
 273     unsigned short rc;
 274 
 275     char *new_at_file;
 276     char *old_at_file;
 277     char *line;
 278     int i;
 279     DWORD exitCode;
 280 
 281     if (argc<3 || argv[1][0] != '-' || (argv[1][1] != 'c' && argv[1][1] != 'm')) {
 282         fprintf(stderr, "Usage: fixpath -c|m<path@path@...> /cygdrive/c/WINDOWS/notepad.exe /cygdrive/c/x/test.txt\n");
 283         exit(0);
 284     }
 285 
 286     if (getenv("DEBUG_FIXPATH") != NULL) {
 287       fprintf(stderr, "fixpath input line >%s<\n", strstr(GetCommandLine(), argv[1]));
 288     }
 289 
 290     if (argv[1][1] == 'c' && argv[1][2] == '\0') {
 291       if (getenv("DEBUG_FIXPATH") != NULL) {
 292         fprintf(stderr, "using cygwin mode\n");
 293       }
 294       replace_cygdrive = replace_cygdrive_cygwin;
 295     } else if (argv[1][1] == 'm') {
 296       if (getenv("DEBUG_FIXPATH") != NULL) {
 297         fprintf(stderr, "using msys mode, with path list: %s\n", &argv[1][2]);
 298       }
 299       setup_msys_path_list(argv[1]);
 300       replace_cygdrive = replace_cygdrive_msys;
 301     } else {
 302       fprintf(stderr, "Unknown mode: %s\n", argv[1]);
 303       exit(-1);
 304     }
 305     line = replace_cygdrive(strstr(GetCommandLine(), argv[2]));
 306 
 307     for (i=1; i<argc; ++i) {
 308        if (argv[i][0] == '@') {
 309           // Found at-file! Fix it!
 310           old_at_file = replace_cygdrive(argv[i]);
 311           new_at_file = fix_at_file(old_at_file);
 312           line = replace_substring(line, old_at_file, new_at_file);
 313        }
 314     }
 315 
 316     if (getenv("DEBUG_FIXPATH") != NULL) {
 317       fprintf(stderr, "fixpath converted line >%s<\n", line);
 318     }
 319 
 320     ZeroMemory(&si,sizeof(si));
 321     si.cb=sizeof(si);
 322     ZeroMemory(&pi,sizeof(pi));
 323 
 324     rc = CreateProcess(NULL,
 325                        line,
 326                        0,
 327                        0,
 328                        TRUE,
 329                        0,
 330                        0,
 331                        0,
 332                        &si,
 333                        &pi);
 334     if(!rc) {
 335       // Could not start process for some reason.  Try to report why:
 336       report_error();
 337       exit(rc);
 338     }
 339 
 340     WaitForSingleObject(pi.hProcess,INFINITE);
 341     GetExitCodeProcess(pi.hProcess,&exitCode);
 342 
 343     if (getenv("DEBUG_FIXPATH") != NULL) {
 344       for (i=0; i<num_files_to_delete; ++i) {
 345         fprintf(stderr, "Not deleting temporary fixpath file %s\n",
 346                 files_to_delete[i]);
 347       }
 348     }
 349     else {
 350       for (i=0; i<num_files_to_delete; ++i) {
 351         remove(files_to_delete[i]);
 352       }
 353     }
 354 
 355     exit(exitCode);
 356 }