/*+
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 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.+
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
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 *+
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 * This code is free software; you can redistribute it and/or modify it+
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 * under the terms of the GNU General Public License version 2 only, as+
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 * published by the Free Software Foundation.  Oracle designates this+
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 * particular file as subject to the "Classpath" exception as provided+
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 * by Oracle in the LICENSE file that accompanied this code.+
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 *+
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 * This code is distributed in the hope that it will be useful, but WITHOUT+
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
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 * version 2 for more details (a copy is included in the LICENSE file that+
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 * accompanied this code).+
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 *+
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 * You should have received a copy of the GNU General Public License version+
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 * 2 along with this work; if not, write to the Free Software Foundation,+
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
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 *+
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
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 * or visit www.oracle.com if you need additional information or have any+
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 * questions.+
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 */+
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+
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#include <Windows.h>+
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#include <io.h>+
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#include <stdio.h>+
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#include <string.h>+
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#include <malloc.h>+
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+
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/*+
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 * Test if pos points to /cygdrive/_/ where _ can+
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 * be any character.+
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 */+
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int is_cygdrive_here(int pos, char *in, int len)+
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{+
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  // Length of /cygdrive/c/ is 12+
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  if (pos+12 > len) return 0;+
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  if (in[pos+11]=='/' &&+
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      in[pos+9]=='/' &&+
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      in[pos+8]=='e' &&+
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      in[pos+7]=='v' &&+
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      in[pos+6]=='i' &&+
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      in[pos+5]=='r' &&+
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      in[pos+4]=='d' &&+
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      in[pos+3]=='g' &&+
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      in[pos+2]=='y' &&+
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      in[pos+1]=='c' &&+
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      in[pos+0]=='/') {+
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    return 1;+
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  }+
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  return 0;+
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}+
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+
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/*+
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 * Replace /cygdrive/_/ with _:/+
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 * Works in place since drive letter is always+
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 * shorter than /cygdrive/+
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 */+
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char *replace_cygdrive(char *in)+
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{+
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  int len = strlen(in);+
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  char *out = malloc(len+1);+
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  int i,j;+
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+
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  if (len < 12) {+
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    strcpy(out, in);+
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    return out;+
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  }+
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  for (i = 0, j = 0; i<len;) {+
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    if (is_cygdrive_here(i, in, len)) {+
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      out[j++] = in[i+10];+
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      out[j++] = ':';+
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      i+=11;+
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    } else {+
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      out[j] = in[i];+
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      i++;+
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      j++;+
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    }+
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  }+
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  out[j] = 0;+
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  return out;+
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}+
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+
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void append(char **b, size_t *bl, size_t *u, char *add, size_t addlen)+
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{+
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  while ( (addlen+*u+1) > *bl) {+
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    *bl *= 2;+
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    *b = realloc(*b, *bl);+
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  }+
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  memcpy(*b+*u, add, addlen);+
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  *u += addlen;+
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}+
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+
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/*+
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 * Creates a new string from in where the first occurance of sub is+
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 * replaced by rep.+
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 */+
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char *replace_substring(char *in, char *sub, char *rep)+
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{+
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  int in_len = strlen(in);+
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  int sub_len = strlen(sub);+
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  int rep_len = strlen(rep);+
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  char *out = malloc(in_len - sub_len + rep_len + 1);+
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  char *p;+
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+
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  if (!(p = strstr(in, sub))) {+
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    // If sub isn't a substring of in, just return in.+
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    return in;+
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  }+
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+
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  // Copy characters from beginning of in to start of sub.+
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  strncpy(out, in, p - in);+
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  out[p - in] = '\0';+
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+
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  sprintf(out + (p - in), "%s%s", rep, p + sub_len);+
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+
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  return out;+
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}+
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+
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char *files_to_delete[1024];+
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int num_files_to_delete = 0;+
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+
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char *fix_at_file(char *in)+
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{+
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  char *tmpdir;+
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  char name[2048];+
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  char *atname;+
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  char *buffer;+
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  size_t buflen=65536;+
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  size_t used=0;+
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  size_t len;+
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  int rc;+
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  FILE *atout;+
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  FILE *atin;+
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  char block[2048];+
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  size_t blocklen;+
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  char *fixed;+
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+
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  atin = fopen(in+1, "r");+
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  if (atin == NULL) {+
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    fprintf(stderr, "Could not read at file %s\n", in+1);+
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    exit(-1);+
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  }+
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+
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  tmpdir = getenv("TMP");+
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  if (tmpdir == NULL) {+
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    tmpdir = "c:/cygwin/tmp";+
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  }+
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  _snprintf(name, sizeof(name), "%s\\atfile_XXXXXX", tmpdir);+
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+
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  rc = _mktemp_s(name, strlen(name)+1);+
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  if (rc) {+
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    fprintf(stderr, "Could not create temporary file name for at file!\n");+
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    exit(-1);+
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  }+
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+
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  atout = fopen(name, "w");+
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  if (atout == NULL) {+
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    fprintf(stderr, "Could open temporary file for writing! %s\n", name);+
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    exit(-1);+
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  }+
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+
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  buffer = malloc(buflen);+
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  while((blocklen = fread(block,1,sizeof(block),atin)) > 0) {+
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    append(&buffer, &buflen, &used, block, blocklen);+
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  }+
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  buffer[used] = 0;+
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  fixed = replace_cygdrive(buffer);+
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  fwrite(fixed, strlen(fixed), 1, atout);+
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  fclose(atin);+
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  fclose(atout);+
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  free(fixed);+
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  free(buffer);+
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  files_to_delete[num_files_to_delete] = malloc(strlen(name)+1);+
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  strcpy(files_to_delete[num_files_to_delete], name);+
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  num_files_to_delete++;+
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  atname = malloc(strlen(name)+2);+
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  atname[0] = '@';+
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  strcpy(atname+1, name);+
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  return atname;+
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}+
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+
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int main(int argc, char **argv)+
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{+
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    STARTUPINFO si;+
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    PROCESS_INFORMATION pi;+
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    unsigned short rc;+
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+
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    char *new_at_file;+
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    char *old_at_file;+
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    char *line;+
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    int i;+
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    DWORD exitCode;+
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+
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    if (argc<2) {+
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        fprintf(stderr, "Usage: uncygdrive.exe /cygdrive/c/WINDOWS/notepad.exe /cygdrive/c/x/test.txt");+
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        exit(0);+
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    }+
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+
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    line = replace_cygdrive(strstr(GetCommandLine(), argv[1]));+
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+
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    for (i=1; i<argc; ++i) {+
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       if (argv[i][0] == '@') {+
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          // Found at-file! Fix it!+
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          old_at_file = replace_cygdrive(argv[i]);+
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          new_at_file = fix_at_file(old_at_file);+
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          line = replace_substring(line, old_at_file, new_at_file);+
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       }+
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    }+
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+
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    if (getenv("DEBUG_UNCYGDRIVE") != NULL) {+
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      fprintf(stderr, "uncygdrive >%s<\n", line);+
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    }+
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+
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    ZeroMemory(&si,sizeof(si));+
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    si.cb=sizeof(si);+
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    ZeroMemory(&pi,sizeof(pi));+
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+
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    rc = CreateProcess(NULL,+
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                       line,+
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                       0,+
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                       0,+
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                       TRUE,+
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                       0,+
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                       0,+
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                       0,+
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                       &si,+
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                       &pi);+
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    if(!rc)+
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    {+
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      //Could not start process;+
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      fprintf(stderr, "Could not start process!\n");+
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      exit(-1);+
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    }+
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+
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    WaitForSingleObject(pi.hProcess,INFINITE);+
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    GetExitCodeProcess(pi.hProcess,&exitCode);+
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+
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    if (getenv("DEBUG_UNCYGDRIVE") != NULL) {+
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      for (i=0; i<num_files_to_delete; ++i) {+
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        fprintf(stderr, "Not deleting temporary uncygdrive file %s\n",+
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                files_to_delete[i]);+
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      }+
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    }+
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    else {+
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      for (i=0; i<num_files_to_delete; ++i) {+
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        remove(files_to_delete[i]);+
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      }+
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    }+
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+
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    exit(exitCode);+
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}+
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