fixpath.c revision 562:befbad2e4d87 
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
32void 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 */
59int 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 */
84char *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
109void 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 */
123char *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
145char* msys_path_list; // @-separated list of paths prefix to look for
146char* msys_path_list_end; // Points to last \0 in msys_path_list.
147
148void 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
176char *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
198char*(*replace_cygdrive)(char *in) = NULL;
199
200char *files_to_delete[1024];
201int num_files_to_delete = 0;
202
203char *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
269int 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}
357