**
** File utilities
*/
#include "config.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include "file.h"

/*
** The file status information from the most recent stat() call.
**
** Use _stati64 rather than stat on windows, in order to handle files
** larger than 2GB.

** Return the number of errors.  No error messages are generated.
*/
static int getStat(const char *zFilename){
  int rc = 0;
  if( zFilename==0 ){
    if( fileStatValid==0 ) rc = 1;
  }else{
    char *zMbcs = fossil_utf8_to_mbcs(zFilename);
    if( fossil_stat(zMbcs, &fileStat)!=0 ){
      fileStatValid = 0;
      rc = 1;
    }else{
      fileStatValid = 1;
      rc = 0;
    }
    fossil_mbcs_free(zMbcs);
  }
  return rc;
}


/*
** Return the size of a file in bytes.  Return -1 if the file does not

  }else{
    return rc ? 0 : (S_ISDIR(fileStat.st_mode) ? 1 : 2);    
  }
#else
  return rc ? 0 : (S_ISDIR(fileStat.st_mode) ? 1 : 2);
#endif
}

/*
** Wrapper around the access() system call.
*/
int file_access(const char *zFilename, int flags){
  char *zMbcs = fossil_utf8_to_mbcs(zFilename);
  int rc = access(zMbcs, flags);
  fossil_mbcs_free(zMbcs);
  return rc;
}

/*
** Find an unused filename similar to zBase with zSuffix appended.
**
** Make the name relative to the working directory if relFlag is true.
**
** Space to hold the new filename is obtained form mprintf() and should
** be freed by the caller.
*/
char *file_newname(const char *zBase, const char *zSuffix, int relFlag){
  char *z = 0;
  int cnt = 0;
  z = mprintf("%s-%s", zBase, zSuffix);
  while( file_size(z)>=0 ){
    fossil_free(z);
    z = mprintf("%s-%s-%d", zBase, zSuffix, cnt++);
  }
  if( relFlag ){
    Blob x;
    file_relative_name(z, &x);
    fossil_free(z);
    z = blob_str(&x);
  }
  return z;
}

/*
** Return the tail of a file pathname.  The tail is the last component
** of the path.  For example, the tail of "/a/b/c.d" is "c.d".
*/
const char *file_tail(const char *z){
  const char *zTail = z;

/*
** Copy the content of a file from one place to another.
*/
void file_copy(const char *zFrom, const char *zTo){
  FILE *in, *out;
  int got;
  char zBuf[8192];
  in = fossil_fopen(zFrom, "rb");
  if( in==0 ) fossil_fatal("cannot open \"%s\" for reading", zFrom);
  out = fossil_fopen(zTo, "wb");
  if( out==0 ) fossil_fatal("cannot open \"%s\" for writing", zTo);
  while( (got=fread(zBuf, 1, sizeof(zBuf), in))>0 ){
    fwrite(zBuf, 1, got, out);
  }
  fclose(in);
  fclose(out);
}

/*
** Set or clear the execute bit on a file.  Return true if a change
** occurred and false if this routine is a no-op.
*/
int file_setexe(const char *zFilename, int onoff){
  int rc = 0;
#if !defined(_WIN32)
  struct stat buf;
  if( fossil_stat(zFilename, &buf)!=0 || S_ISLNK(buf.st_mode) ) return 0;
  if( onoff ){
    int targetMode = (buf.st_mode & 0444)>>2;
    if( (buf.st_mode & 0111)!=targetMode ){
      chmod(zFilename, buf.st_mode | targetMode);
      rc = 1;
    }
  }else{
    if( (buf.st_mode & 0111)!=0 ){
      chmod(zFilename, buf.st_mode & ~0111);
      rc = 1;
    }
  }
#endif /* _WIN32 */
  return rc;
}

/*
** Delete a file.
*/
void file_delete(const char *zFilename){
  char *z = fossil_utf8_to_mbcs(zFilename);
  unlink(z);
  fossil_mbcs_free(z);
}

/*
** Create the directory named in the argument, if it does not already
** exist.  If forceFlag is 1, delete any prior non-directory object 
** with the same name.
**
** Return the number of errors.
*/
int file_mkdir(const char *zName, int forceFlag){
  int rc = file_isdir(zName);
  if( rc==2 ){
    if( !forceFlag ) return 1;
    file_delete(zName);
  }
  if( rc!=1 ){
#if defined(_WIN32)
    int rc;
    char *zMbcs = fossil_utf8_to_mbcs(zName);
    rc = mkdir(zMbcs);
    fossil_mbcs_free(zMbcs);
    return rc;
#else
    return mkdir(zName, 0755);
#endif
  }
  return 0;
}

    if( z[i]=='\\' ) z[i] = '/';
  }
#endif

  /* Removing trailing "/" characters */
  while( n>1 && z[n-1]=='/' ){ n--; }

  /* Remove duplicate '/' characters.  Except, two // at the beginning
  ** of a pathname is allowed since this is important on windows. */
  for(i=j=1; i<n; i++){
    z[j++] = z[i];
    while( z[i]=='/' && i<n-1 && z[i+1]=='/' ) i++;
  }
  n = j;

  /* Skip over zero or more initial "./" sequences */
  for(i=0; i<n-1 && z[i]=='.' && z[i+1]=='/'; i+=2){}

** Print the simplified versions of each FILENAME.
*/
void cmd_test_simplify_name(void){
  int i;
  char *z;
  for(i=2; i<g.argc; i++){
    z = mprintf("%s", g.argv[i]);
    fossil_print("[%s] -> ", z);
    file_simplify_name(z, -1);
    fossil_print("[%s]\n", z);
    fossil_free(z);
  }
}

/*
** Get the current working directory.
**
** On windows, the name is converted from MBCS to UTF8 and all '\\'
** characters are converted to '/'.  No conversions are needed on
** unix.
*/
void file_getcwd(char *zBuf, int nBuf){
#ifdef _WIN32
  char *zPwdUtf8;
  int nPwd;
  int i;
  char zPwd[2000];
  if( getcwd(zPwd, sizeof(zPwd)-1)==0 ){
    fossil_fatal("cannot find the current working directory.");
  }
  zPwdUtf8 = fossil_mbcs_to_utf8(zPwd);
  nPwd = strlen(zPwdUtf8);
  if( nPwd > nBuf-1 ){
    fossil_fatal("pwd too big: max %d\n", nBuf-1);
  }
  for(i=0; zPwdUtf8[i]; i++) if( zPwdUtf8[i]=='\\' ) zPwdUtf8[i] = '/';
  memcpy(zBuf, zPwdUtf8, nPwd+1);
  fossil_mbcs_free(zPwdUtf8);
#else
  if( getcwd(zBuf, nBuf-1)==0 ){
    if( errno==ERANGE ){
      fossil_fatal("pwd too big: max %d\n", nBuf-1);
    }else{
      fossil_fatal("cannot find current working directory; %s",
                   strerror(errno));
    }
  }
#endif
}

/*
** Compute a canonical pathname for a file or directory.
** Make the name absolute if it is relative.
** Remove redundant / characters
** Remove all /./ path elements.
** Convert /A/../ to just /
*/
void file_canonical_name(const char *zOrigName, Blob *pOut){
  if( zOrigName[0]=='/' 
#if defined(_WIN32)
      || zOrigName[0]=='\\'
      || (strlen(zOrigName)>3 && zOrigName[1]==':'
           && (zOrigName[2]=='\\' || zOrigName[2]=='/'))
#endif
  ){
    blob_set(pOut, zOrigName);
    blob_materialize(pOut);
  }else{
    char zPwd[2000];
    file_getcwd(zPwd, sizeof(zPwd)-strlen(zOrigName));



    blob_zero(pOut);
    blob_appendf(pOut, "%//%/", zPwd, zOrigName);
  }
  blob_resize(pOut, file_simplify_name(blob_buffer(pOut), blob_size(pOut)));
}

/*

  int i;
  Blob x;
  blob_zero(&x);
  for(i=2; i<g.argc; i++){
    char zBuf[100];
    const char *zName = g.argv[i];
    file_canonical_name(zName, &x);
    fossil_print("[%s] -> [%s]\n", zName, blob_buffer(&x));
    blob_reset(&x);
    sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", file_size(zName));
    fossil_print("  file_size   = %s\n", zBuf);
    sqlite3_snprintf(sizeof(zBuf), zBuf, "%lld", file_mtime(zName));
    fossil_print("  file_mtime  = %s\n", zBuf);
    fossil_print("  file_isfile = %d\n", file_isfile(zName));
    fossil_print("  file_isfile_or_link = %d\n", file_isfile_or_link(zName));
    fossil_print("  file_islink = %d\n", file_islink(zName));
    fossil_print("  file_isexe  = %d\n", file_isexe(zName));
    fossil_print("  file_isdir  = %d\n", file_isdir(zName));

  }
}

/*
** Return TRUE if the given filename is canonical.
**
** Canonical names are full pathnames using "/" not "\" and which

        if( z[i+2]=='/' || z[i+2]==0 ) return 0;
        if( z[i+2]=='.' && (z[i+3]=='/' || z[i+3]==0) ) return 0;
      }
    }
  }
  return 1;
}

/* 
** Return a pointer to the first character in a pathname past the
** drive letter.  This routine is a no-op on unix.
*/
char *file_without_drive_letter(char *zIn){
#ifdef _WIN32
  if( fossil_isalpha(zIn[0]) && zIn[1]==':' ) zIn += 2;
#endif
  return zIn;
}

/*
** Compute a pathname for a file or directory that is relative
** to the current directory.
*/
void file_relative_name(const char *zOrigName, Blob *pOut){
  char *zPath;
  blob_set(pOut, zOrigName);
  blob_resize(pOut, file_simplify_name(blob_buffer(pOut), blob_size(pOut))); 
  zPath = file_without_drive_letter(blob_buffer(pOut));
  if( zPath[0]=='/' ){
    int i, j;
    Blob tmp;
    char *zPwd;
    char zBuf[2000];
    zPwd = zBuf;
    file_getcwd(zBuf, sizeof(zBuf)-20);
    zPwd = file_without_drive_letter(zBuf);
    i = 1;
#ifdef _WIN32
    while( zPath[i] && fossil_tolower(zPwd[i])==fossil_tolower(zPath[i]) ) i++;

#else
    while( zPath[i] && zPwd[i]==zPath[i] ) i++;
#endif
    if( zPath[i]==0 ){
      blob_reset(pOut);
      if( zPwd[i]==0 ){
        blob_append(pOut, ".", 1);
      }else{
        blob_append(pOut, "..", 2);
        for(j=i+1; zPwd[j]; j++){

*/
void cmd_test_relative_name(void){
  int i;
  Blob x;
  blob_zero(&x);
  for(i=2; i<g.argc; i++){
    file_relative_name(g.argv[i], &x);
    fossil_print("%s\n", blob_buffer(&x));
    blob_reset(&x);
  }
}

/*
** Compute a pathname for a file relative to the root of the local
** tree.  Return TRUE on success.  On failure, print and error

*/
void cmd_test_tree_name(void){
  int i;
  Blob x;
  blob_zero(&x);
  for(i=2; i<g.argc; i++){
    if( file_tree_name(g.argv[i], &x, 1) ){
      fossil_print("%s\n", blob_buffer(&x));
      blob_reset(&x);
    }
  }
}

/*
** Parse a URI into scheme, host, port, and path.

     ".",
  };
  static const unsigned char zChars[] =
    "abcdefghijklmnopqrstuvwxyz"
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "0123456789";
  unsigned int i, j;

  const char *zDir = ".";
  int cnt = 0;
  
  for(i=0; i<sizeof(azDirs)/sizeof(azDirs[0]); i++){
    if( !file_isdir(azDirs[i]) ) continue;


    zDir = azDirs[i];
    break;
  }

  /* Check that the output buffer is large enough for the temporary file 
  ** name. If it is not, return SQLITE_ERROR.
  */
  if( (strlen(zDir) + 17) >= (size_t)nBuf ){
    fossil_fatal("insufficient space for temporary filename");
  }

  do{
    if( cnt++>20 ) fossil_panic("cannot generate a temporary filename");
    sqlite3_snprintf(nBuf-17, zBuf, "%s/", zDir);
    j = (int)strlen(zBuf);
    sqlite3_randomness(15, &zBuf[j]);
    for(i=0; i<15; i++, j++){
      zBuf[j] = (char)zChars[ ((unsigned char)zBuf[j])%(sizeof(zChars)-1) ];
    }
    zBuf[j] = 0;
  }while( file_size(zBuf)>=0 );
}


/*
** Return true if a file named zName exists and has identical content
** to the blob pContent.  If zName does not exist or if the content is
** different in any way, then return false.

  }else{
    blob_read_from_file(&onDisk, zName);
  }
  rc = blob_compare(&onDisk, pContent);
  blob_reset(&onDisk);
  return rc==0;
}


/**************************************************************************
** The following routines translate between MBCS and UTF8 on windows.
** Since everything is always UTF8 on unix, these routines are no-ops
** there.
*/
#ifdef _WIN32
# include <windows.h>
#endif

/*
** Translate MBCS to UTF8.  Return a pointer to the translated text.  
** Call fossil_mbcs_free() to deallocate any memory used to store the
** returned pointer when done.
*/
char *fossil_mbcs_to_utf8(const char *zMbcs){
#ifdef _WIN32
  extern char *sqlite3_win32_mbcs_to_utf8(const char*);
  return sqlite3_win32_mbcs_to_utf8(zMbcs);
#else
  return (char*)zMbcs;  /* No-op on unix */
#endif  
}

/*
** Translate UTF8 to MBCS for use in system calls.  Return a pointer to the
** translated text..  Call fossil_mbcs_free() to deallocate any memory
** used to store the returned pointer when done.
*/
char *fossil_utf8_to_mbcs(const char *zUtf8){
#ifdef _WIN32
  extern char *sqlite3_win32_utf8_to_mbcs(const char*);
  return sqlite3_win32_utf8_to_mbcs(zUtf8);
#else
  return (char*)zUtf8;  /* No-op on unix */
#endif  
}

/*
** Translate UTF8 to MBCS for display on the console.  Return a pointer to the
** translated text..  Call fossil_mbcs_free() to deallocate any memory
** used to store the returned pointer when done.
*/
char *fossil_utf8_to_console(const char *zUtf8){
#ifdef _WIN32
  int nChar, nByte;
  WCHAR *zUnicode;   /* Unicode version of zUtf8 */
  char *zConsole;    /* Console version of zUtf8 */
  int codepage;      /* Console code page */

  nChar = MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, NULL, 0);
  zUnicode = malloc( nChar*sizeof(zUnicode[0]) );
  if( zUnicode==0 ){
    return 0;
  }
  nChar = MultiByteToWideChar(CP_UTF8, 0, zUtf8, -1, zUnicode, nChar);
  if( nChar==0 ){
    free(zUnicode);
    return 0;
  }
  codepage = GetConsoleCP();
  nByte = WideCharToMultiByte(codepage, 0, zUnicode, -1, 0, 0, 0, 0);
  zConsole = malloc( nByte );
  if( zConsole==0 ){
    free(zUnicode);
    return 0;
  }
  nByte = WideCharToMultiByte(codepage, 0, zUnicode, -1, zConsole, nByte, 0, 0);
  free(zUnicode);
  if( nByte == 0 ){
    free(zConsole);
    zConsole = 0;
  }
  return zConsole;
#else
  return (char*)zUtf8;  /* No-op on unix */
#endif  
}

/*
** Translate MBCS to UTF8.  Return a pointer.  Call fossil_mbcs_free()
** to deallocate any memory used to store the returned pointer when done.
*/
void fossil_mbcs_free(char *zOld){
#ifdef _WIN32
  free(zOld);
#else
  /* No-op on unix */
#endif  
}

/*
** Like fopen() but always takes a UTF8 argument.
*/
FILE *fossil_fopen(const char *zName, const char *zMode){
  char *zMbcs = fossil_utf8_to_mbcs(zName);
  FILE *f = fopen(zMbcs, zMode);
  fossil_mbcs_free(zMbcs);
  return f;
}