src/corelib/io/qtemporaryfile.cpp File Reference

#include "qplatformdefs.h"
#include "qtemporaryfile.h"
#include "qabstractfileengine.h"
#include "private/qfile_p.h"
#include "private/qabstractfileengine_p.h"
#include "private/qfsfileengine_p.h"
#include <stdlib.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <time.h>
#include <ctype.h>

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Classes
class	QTemporaryFileEngine
class	QTemporaryFilePrivate
Defines
#define	S_ISDIR(m)   (((m) & S_IFMT) == S_IFDIR)
Functions
static int	_gettemp (char *path, int *doopen, int domkdir, int slen)
static int	qt_mkstemps (char *path, int slen)

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Define Documentation

#define S_ISDIR

(

m

)

(((m) & S_IFMT) == S_IFDIR)

Referenced by _gettemp(), QKqueueFileSystemWatcherEngine::addPaths(), QFSFileEngine::fileName(), and qws_dataDir().

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Function Documentation

static int _gettemp	(	char *	path,
		int *	doopen,
		int	domkdir,
		int	slen
	)			[static]

Definition at line 76 of file qtemporaryfile.cpp.

References c, qrand(), S_ISDIR, and start.

Referenced by qt_mkstemps().

{
  char *start, *trv, *suffp;
  struct stat sbuf;
  int rval;
#ifdef Q_OS_WIN
    int pid;
#else
  pid_t pid;
#endif

  if (doopen && domkdir) {
    errno = EINVAL;
    return(0);
  }

  for (trv = path; *trv; ++trv)
    ;
  trv -= slen;
  suffp = trv;
  --trv;
  if (trv < path) {
    errno = EINVAL;
    return (0);
  }
#if defined(Q_OS_WIN) && defined(_MSC_VER) && _MSC_VER >= 1400
        pid = _getpid();
#else
        pid = getpid();
#endif
  while (trv >= path && *trv == 'X' && pid != 0) {
    *trv-- = (pid % 10) + '0';
    pid /= 10;
        }

#ifndef S_ISDIR
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif

        while (trv >= path && *trv == 'X') {
            char c;

            // CHANGE arc4random() -> random()
            pid = (qrand() & 0xffff) % (26+26);
    if (pid < 26)
      c = pid + 'A';
    else
      c = (pid - 26) + 'a';
    *trv-- = c;
  }
  start = trv + 1;

  /*
   * check the target directory; if you have six X's and it
   * doesn't exist this runs for a *very* long time.
   */
  if (doopen || domkdir) {
    for (;; --trv) {
      if (trv <= path)
        break;
      if (*trv == '/') {
        *trv = '\0';
        rval = stat(path, &sbuf);
        *trv = '/';
        if (rval != 0)
          return(0);
        if (!S_ISDIR(sbuf.st_mode)) {
          errno = ENOTDIR;
          return(0);
        }
        break;
      }
    }
  }

  for (;;) {
    if (doopen) {
#if defined(Q_OS_WIN) && defined(_MSC_VER) && _MSC_VER >= 1400
                        if (_sopen_s(doopen, path, O_CREAT|O_EXCL|O_RDWR|O_BINARY, _SH_DENYNO, _S_IREAD | _S_IWRITE)== 0)
#else
                        if ((*doopen =
                            open(path, O_CREAT|O_EXCL|O_RDWR
#  if defined(Q_OS_WIN)
                                 |O_BINARY
#  endif
                                 , 0600)) >= 0)
#endif

        return(1);
      if (errno != EEXIST)
        return(0);
    } else if (domkdir) {
#ifdef Q_OS_WIN
                    if (QT_MKDIR(path) == 0)
#else
                    if (mkdir(path, 0700) == 0)
#endif
        return(1);
      if (errno != EEXIST)
        return(0);
            }
#ifndef Q_OS_WIN
            else if (lstat(path, &sbuf))
      return(errno == ENOENT ? 1 : 0);
#endif

    /* tricky little algorwwithm for backward compatibility */
    for (trv = start;;) {
      if (!*trv)
        return (0);
      if (*trv == 'Z') {
        if (trv == suffp)
          return (0);
        *trv++ = 'a';
      } else {
        if (isdigit(*trv))
          *trv = 'a';
        else if (*trv == 'z') /* inc from z to A */
          *trv = 'A';
        else {
          if (trv == suffp)
            return (0);
          ++*trv;
        }
        break;
      }
    }
  }
  /*NOTREACHED*/
}

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static int qt_mkstemps	(	char *	path,
		int	slen
	)			[static]

Definition at line 207 of file qtemporaryfile.cpp.

References _gettemp().

Referenced by QTemporaryFileEngine::open().

{
  int fd;
  return (_gettemp(path, &fd, 0, slen) ? fd : -1);
}

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