text: /*
   * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code is distributed in the hope that it will be useful, but WITHOUT
   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  #include <Windows.h>
  #include <stdbool.h>
  #include <io.h>
  #include <stdio.h>
  #include <string.h>
  #include <malloc.h>
  
  void report_error(char const * msg)
  {
    LPVOID lpMsgBuf;
    DWORD dw = GetLastError();
  
    FormatMessage(
        FORMAT_MESSAGE_ALLOCATE_BUFFER |
        FORMAT_MESSAGE_FROM_SYSTEM |
        FORMAT_MESSAGE_IGNORE_INSERTS,
        NULL,
        dw,
        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
        (LPTSTR) &lpMsgBuf,
        0,
        NULL);
  
    fprintf(stderr,
            "%s  Failed with error %d: %s\n",
            msg, dw, lpMsgBuf);
  
    LocalFree(lpMsgBuf);
  }
  
  /*
   * Test if pos points to /prefix/_/ where _ can
   * be any character.
   */
  int is_prefix_here(int pos, char const *in, int len, const char* prefix)
  {
    // Length of c/ is 2
    int prefix_size = strlen(prefix);
    if (pos+prefix_size+2 > len) return 0;
    if (in[pos+prefix_size+1]=='/') {
      return strncmp(in + pos, prefix, prefix_size) == 0;
    }
    return 0;
  }
  
  /*
   * Replace /cygdrive/_/ with _:/
   * Works in place since drive letter is always
   * shorter than /cygdrive/
   */
  char *replace_cygdrive_cygwin(char const *in)
  {
    size_t len = strlen(in);
    char *out = (char*) malloc(len+1);
    int i,j;
  
    if (len < 12) {
      memmove(out, in, len + 1);
      return out;
    }
  
    for (i = 0, j = 0; i<len;) {
      if (is_prefix_here(i, in, len, "/cygdrive/")) {
        out[j++] = in[i+10];
        out[j++] = ':';
        i+=11;
      } else {
        out[j] = in[i];
        i++;
        j++;
      }
    }
    out[j] = '\0';
    return out;
  }
  
  void append(char **b, size_t *bl, size_t *u, char *add, size_t addlen)
  {
    while ((addlen+*u+1) > *bl) {
      *bl *= 2;
      *b = (char*) realloc(*b, *bl);
    }
    memcpy(*b+*u, add, addlen);
    *u += addlen;
  }
  
  /*
   * Creates a new string from in where the first occurrence of sub is
   * replaced by rep.
   */
  char *replace_substring(char *in, char *sub, char *rep)
  {
    int in_len = strlen(in);
    int sub_len = strlen(sub);
    int rep_len = strlen(rep);
    char *out = (char *) malloc(in_len - sub_len + rep_len + 1);
    char *p;
  
    if (!(p = strstr(in, sub))) {
      // If sub isn't a substring of in, just return in.
      return in;
    }
  
    // Copy characters from beginning of in to start of sub.
    strncpy(out, in, p - in);
    out[p - in] = '\0';
  
    sprintf(out + (p - in), "%s%s", rep, p + sub_len);
  
    return out;
  }
  
  char* msys_path_list; // @-separated list of paths prefix to look for
  char* msys_path_list_end; // Points to last \0 in msys_path_list.
  
  void setup_msys_path_list(char const * argument)
  {
    char* p;
    char* drive_letter_pos;
  
    msys_path_list = strdup(&argument[2]);
    msys_path_list_end = &msys_path_list[strlen(msys_path_list)];
  
    // Convert all at-sign (@) in path list to \0.
    // @ was chosen as separator to minimize risk of other tools messing around with it
    p = msys_path_list;
    do {
      if (p[1] == ':') {
        // msys has mangled our path list, restore it from c:/... to /c/...
        drive_letter_pos = p+1;
        *drive_letter_pos = *p;
        *p = '/';
      }
  
      // Look for an @ in the list
      p = strchr(p, '@');
      if (p != NULL) {
        *p = '\0';
        p++;
      }
    } while (p != NULL);
  }
  
  char *replace_cygdrive_msys(char const *in)
  {
    char* str;
    char* prefix;
    char* p;
  
    str = strdup(in);
  
    // For each prefix in the path list, search for it and replace /c/... with c:/...
    for (prefix = msys_path_list; prefix < msys_path_list_end && prefix != NULL; prefix += strlen(prefix)+1) {
      p=str;
      while ((p = strstr(p, prefix))) {
        char* drive_letter = p+1;
        *p = *drive_letter;
        *drive_letter = ':';
        p++;
      }
    }
  
    return str;
  }
  
  /*
   * Replace /mnt/_/ with _:/
   * Works in place since drive letter is always
   * shorter than /mnt/
   */
  char *replace_cygdrive_wsl(char const *in)
  {
    size_t len = strlen(in);
    char *out = (char*) malloc(len+1);
    int i,j;
  
    if (len < 7) {
      memmove(out, in, len + 1);
      return out;
    }
  
    for (i = 0, j = 0; i<len;) {
      if (is_prefix_here(i, in, len, "/mnt/")) {
        out[j++] = in[i+5];
        out[j++] = ':';
        i+=6;
      } else {
        out[j] = in[i];
        i++;
        j++;
      }
    }
    out[j] = '\0';
    return out;
  }
  
  char*(*replace_cygdrive)(char const *in) = NULL;
  bool debug_fixpath = false;
  
  char *files_to_delete[1024];
  int num_files_to_delete = 0;
  
  char *fix_at_file(char const *in)
  {
    char *tmpdir;
    char name[2048];
    char *atname;
    char *buffer;
    size_t buflen=65536;
    size_t used=0;
    size_t len;
    int rc;
    FILE *atout;
    FILE *atin;
    char block[2048];
    size_t blocklen;
    char *fixed;
  
    atin = fopen(in+1, "r");
    if (atin == NULL) {
      fprintf(stderr, "Could not read at file %s\n", in+1);
      exit(-1);
    }
  
    tmpdir = getenv("TEMP");
    if (tmpdir == NULL) {
  #if _WIN64
      tmpdir = "c:/cygwin64/tmp";
  #else
      tmpdir = "c:/cygwin/tmp";
  #endif
    }
    _snprintf(name, sizeof(name), "%s\\atfile_XXXXXX", tmpdir);
  
    rc = _mktemp_s(name, strlen(name)+1);
    if (rc) {
      fprintf(stderr, "Could not create temporary file name for at file!\n");
      exit(-1);
    }
  
    atout = fopen(name, "w");
    if (atout == NULL) {
      fprintf(stderr, "Could not open temporary file for writing! %s\n", name);
      exit(-1);
    }
  
    buffer = (char*) malloc(buflen);
    while ((blocklen = fread(block, 1, sizeof(block), atin)) > 0) {
      append(&buffer, &buflen, &used, block, blocklen);
    }
    buffer[used] = 0;
    if (debug_fixpath) {
      fprintf(stderr, "fixpath input from @-file %s: %s\n", &in[1], buffer);
    }
    fixed = replace_cygdrive(buffer);
    if (debug_fixpath) {
      fprintf(stderr, "fixpath converted to @-file %s is: %s\n", name, fixed);
    }
    fwrite(fixed, strlen(fixed), 1, atout);
    fclose(atin);
    fclose(atout);
    free(fixed);
    free(buffer);
    files_to_delete[num_files_to_delete] = (char*) malloc(strlen(name)+1);
    strcpy(files_to_delete[num_files_to_delete], name);
    num_files_to_delete++;
    atname = (char*) malloc(strlen(name)+2);
    atname[0] = '@';
    strcpy(atname+1, name);
    return atname;
  }
  
  // given an argument, convert it to the windows command line safe quoted version
  // using rules from:
  // http://blogs.msdn.com/b/twistylittlepassagesallalike/archive/2011/04/23/everyone-quotes-arguments-the-wrong-way.aspx
  // caller is responsible for freeing both input and output.
  char * quote_arg(char const * in_arg) {
    char *quoted = NULL;
    char *current = quoted;
    int pass;
  
    if (strlen(in_arg) == 0) {
       // empty string? explicitly quote it.
       return _strdup("\"\"");
    }
  
    if (strpbrk(in_arg, " \t\n\v\r\\\"") == NULL) {
       return _strdup(in_arg);
    }
  
    // process the arg twice. Once to calculate the size and then to copy it.
    for (pass=1; pass<=2; pass++) {
      char const *arg = in_arg;
  
      // initial "
      if (pass == 2) {
        *current = '\"';
      }
      current++;
  
      // process string to be quoted until NUL
      do {
        int escapes = 0;
  
        while (*arg == '\\') {
          // count escapes.
          escapes++;
          arg++;
        }
  
        if (*arg == '\0') {
           // escape the escapes before final "
           escapes *= 2;
        } else if (*arg == '"') {
          // escape the escapes and the "
          escapes = escapes * 2 + 1;
        } else {
           // escapes aren't special, just echo them.
        }
  
        // emit some escapes
        while (escapes > 0) {
          if (pass == 2) {
            *current = '\\';
          }
          current++;
          escapes--;
        }
  
        // and the current char
        if (pass == 2) {
          *current = *arg;
        }
        current++;
      } while (*arg++ != '\0');
  
      // allocate the buffer
      if (pass == 1) {
        size_t alloc = (size_t) (current - quoted + (ptrdiff_t) 2);
        current = quoted = (char*) calloc(alloc, sizeof(char));
      }
    }
  
    // final " and \0
    *(current - 1) = '"';
    *current = '\0';
  
    return quoted;
  }
  
  int main(int argc, char const ** argv)
  {
      STARTUPINFO si;
      PROCESS_INFORMATION pi;
      unsigned short rc;
  
      char *line;
      char *current;
      int i, cmd;
      DWORD exitCode = 0;
      DWORD processFlags = 0;
      BOOL processInheritHandles = TRUE;
      BOOL waitForChild = TRUE;
      char* fixpathPath;
  
      debug_fixpath = (getenv("DEBUG_FIXPATH") != NULL);
  
      if (argc<2 || argv[1][0] != '-' || (argv[1][1] != 'c' && argv[1][1] != 'm' && argv[1][1] != 'w')) {
          fprintf(stderr, "Usage: fixpath -c|m|w<path@path@...> [--detach] /cygdrive/c/WINDOWS/notepad.exe [/cygdrive/c/x/test.txt|@/cygdrive/c/x/atfile]\n");
          exit(0);
      }
  
      if (debug_fixpath) {
        char const * cmdline = GetCommandLine();
        fprintf(stderr, "fixpath input line >%s<\n", strstr(cmdline, argv[1]));
      }
  
      if (argv[1][1] == 'c' && argv[1][2] == '\0') {
        if (debug_fixpath) {
          fprintf(stderr, "fixpath using cygwin mode\n");
        }
        replace_cygdrive = replace_cygdrive_cygwin;
      } else if (argv[1][1] == 'm') {
        if (debug_fixpath) {
          fprintf(stderr, "fixpath using msys mode, with path list: %s\n", &argv[1][2]);
        }
        setup_msys_path_list(argv[1]);
        replace_cygdrive = replace_cygdrive_msys;
      } else if (argv[1][1] == 'w') {
        if (debug_fixpath) {
          fprintf(stderr, "fixpath using wsl mode, with path list: %s\n", &argv[1][2]);
        }
        replace_cygdrive = replace_cygdrive_wsl;
      } else {
        fprintf(stderr, "fixpath Unknown mode: %s\n", argv[1]);
        exit(-1);
      }
  
      if (argv[2][0] == '-') {
        if (strcmp(argv[2], "--detach") == 0) {
          if (debug_fixpath) {
            fprintf(stderr, "fixpath in detached mode\n");
          }
          processFlags |= DETACHED_PROCESS;
          processInheritHandles = FALSE;
          waitForChild = FALSE;
        } else {
          fprintf(stderr, "fixpath Unknown argument: %s\n", argv[2]);
          exit(-1);
        }
        i = 3;
      } else {
        i = 2;
      }
  
      // handle assignments
      while (i < argc) {
        char const * assignment = strchr(argv[i], '=');
        if (assignment != NULL && assignment != argv[i]) {
          size_t var_len = (size_t) (assignment - argv[i] + (ptrdiff_t) 1);
          char *var = (char *) calloc(var_len, sizeof(char));
          char *val = replace_cygdrive(assignment + 1);
          memmove(var, argv[i], var_len);
          var[var_len - 1] = '\0';
          strupr(var);
  
          if (debug_fixpath) {
            fprintf(stderr, "fixpath setting var >%s< to >%s<\n", var, val);
          }
  
          rc = SetEnvironmentVariable(var, val);
          if (!rc) {
            // Could not set var for some reason.  Try to report why.
            const int msg_len = 80 + var_len + strlen(val);
            char * msg = (char *) alloca(msg_len);
            _snprintf_s(msg, msg_len, _TRUNCATE, "Could not set environment variable [%s=%s]", var, val);
            report_error(msg);
            exit(1);
          }
          free(var);
          free(val);
        } else {
          // no more assignments;
          break;
        }
        i++;
      }
  
      // remember index of the command
      cmd = i;
  
      // handle command and it's args.
      while (i < argc) {
        char const *replaced = replace_cygdrive(argv[i]);
        if (replaced[0] == '@') {
          if (waitForChild == FALSE) {
            fprintf(stderr, "fixpath Cannot use @-files in detached mode: %s\n", replaced);
            exit(1);
          }
          // Found at-file! Fix it!
          replaced = fix_at_file(replaced);
        }
        argv[i] = quote_arg(replaced);
        i++;
      }
  
      // determine the length of the line
      line = NULL;
      // args
      for (i = cmd; i < argc; i++) {
        line += (ptrdiff_t) strlen(argv[i]);
      }
      // spaces and null
      line += (ptrdiff_t) (argc - cmd + 1);
      // allocate
      line = (char*) calloc(line - (char*) NULL, sizeof(char));
  
      // copy in args.
      current = line;
      for (i = cmd; i < argc; i++) {
        ptrdiff_t len = strlen(argv[i]);
        if (i != cmd) {
          *current++ = ' ';
        }
        memmove(current, argv[i], len);
        current += len;
      }
      *current = '\0';
  
      if (debug_fixpath) {
        fprintf(stderr, "fixpath converted line >%s<\n", line);
      }
  
      if (cmd == argc) {
        if (debug_fixpath) {
          fprintf(stderr, "fixpath no command provided!\n");
        }
        exit(0);
      }
  
      ZeroMemory(&si, sizeof(si));
      si.cb=sizeof(si);
      ZeroMemory(&pi, sizeof(pi));
  
      fflush(stderr);
      fflush(stdout);
  
      fixpathPath = calloc(32767, sizeof(char));
      rc = GetEnvironmentVariable("FIXPATH_PATH", fixpathPath, 32767);
      if (rc) {
        if (debug_fixpath) {
          fprintf(stderr, "Setting Path to FIXPATH_PATH: %s\n", fixpathPath);
        }
        rc = SetEnvironmentVariable("Path", fixpathPath);
        if (!rc) {
          // Could not set Path for some reason.  Try to report why.
          const int msg_len = 80 + strlen(fixpathPath);
          char * msg = (char *)alloca(msg_len);
          _snprintf_s(msg, msg_len, _TRUNCATE, "Could not set environment variable [Path=%s]", fixpathPath);
          report_error(msg);
          exit(1);
        }
      }
  
      rc = CreateProcess(NULL,
                         line,
                         0,
                         0,
                         processInheritHandles,
                         processFlags,
                         NULL,
                         NULL,
                         &si,
                         &pi);
      if (!rc) {
        // Could not start process for some reason.  Try to report why:
        report_error("Could not start process!");
        exit(126);
      }
  
      if (waitForChild == TRUE) {
        WaitForSingleObject(pi.hProcess, INFINITE);
        GetExitCodeProcess(pi.hProcess, &exitCode);
  
        if (debug_fixpath) {
          for (i=0; i<num_files_to_delete; ++i) {
            fprintf(stderr, "fixpath Not deleting temporary file %s\n",
                    files_to_delete[i]);
          }
        } else {
          for (i=0; i<num_files_to_delete; ++i) {
            remove(files_to_delete[i]);
          }
        }
  
        if (exitCode != 0) {
          if (debug_fixpath) {
            fprintf(stderr, "fixpath exit code %d\n",
                    exitCode);
          }
        }
      } else {
        if (debug_fixpath) {
          fprintf(stderr, "fixpath Not waiting for child process");
        }
      }
  
      exit(exitCode);
  }
  