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comparison Python/fileutils.c @ 65163:7879a8ec7f79

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Ooops, fileutils.c contains twice the same code I suppose that I reapplied my local patch creating Python/fileutils.c whereas the file already existed.
author Victor Stinner <victor.stinner@haypocalc.com>
date Thu, 07 Oct 2010 21:55:44 +0000
parents 39014f0abc32
children 1f3919af8a53
comparison
equal deleted inserted replaced
65162:39014f0abc32 65163:7879a8ec7f79
374 return buf; 374 return buf;
375 #endif 375 #endif
376 } 376 }
377 377
378 #endif 378 #endif
379
380 #include "Python.h"
381
382 #ifdef HAVE_STAT
383
384 /* Decode a byte string from the locale encoding with the
385 surrogateescape error handler (undecodable bytes are decoded as characters
386 in range U+DC80..U+DCFF). If a byte sequence can be decoded as a surrogate
387 character, escape the bytes using the surrogateescape error handler instead
388 of decoding them.
389
390 Use _Py_wchar2char() to encode the character string back to a byte string.
391
392 Return a pointer to a newly allocated (wide) character string (use
393 PyMem_Free() to free the memory), or NULL on error (conversion error or
394 memory error). */
395 wchar_t*
396 _Py_char2wchar(char* arg)
397 {
398 wchar_t *res;
399 #ifdef HAVE_BROKEN_MBSTOWCS
400 /* Some platforms have a broken implementation of
401 * mbstowcs which does not count the characters that
402 * would result from conversion. Use an upper bound.
403 */
404 size_t argsize = strlen(arg);
405 #else
406 size_t argsize = mbstowcs(NULL, arg, 0);
407 #endif
408 size_t count;
409 unsigned char *in;
410 wchar_t *out;
411 #ifdef HAVE_MBRTOWC
412 mbstate_t mbs;
413 #endif
414 if (argsize != (size_t)-1) {
415 res = (wchar_t *)PyMem_Malloc((argsize+1)*sizeof(wchar_t));
416 if (!res)
417 goto oom;
418 count = mbstowcs(res, arg, argsize+1);
419 if (count != (size_t)-1) {
420 wchar_t *tmp;
421 /* Only use the result if it contains no
422 surrogate characters. */
423 for (tmp = res; *tmp != 0 &&
424 (*tmp < 0xd800 || *tmp > 0xdfff); tmp++)
425 ;
426 if (*tmp == 0)
427 return res;
428 }
429 PyMem_Free(res);
430 }
431 /* Conversion failed. Fall back to escaping with surrogateescape. */
432 #ifdef HAVE_MBRTOWC
433 /* Try conversion with mbrtwoc (C99), and escape non-decodable bytes. */
434
435 /* Overallocate; as multi-byte characters are in the argument, the
436 actual output could use less memory. */
437 argsize = strlen(arg) + 1;
438 res = (wchar_t*)PyMem_Malloc(argsize*sizeof(wchar_t));
439 if (!res) goto oom;
440 in = (unsigned char*)arg;
441 out = res;
442 memset(&mbs, 0, sizeof mbs);
443 while (argsize) {
444 size_t converted = mbrtowc(out, (char*)in, argsize, &mbs);
445 if (converted == 0)
446 /* Reached end of string; null char stored. */
447 break;
448 if (converted == (size_t)-2) {
449 /* Incomplete character. This should never happen,
450 since we provide everything that we have -
451 unless there is a bug in the C library, or I
452 misunderstood how mbrtowc works. */
453 fprintf(stderr, "unexpected mbrtowc result -2\n");
454 return NULL;
455 }
456 if (converted == (size_t)-1) {
457 /* Conversion error. Escape as UTF-8b, and start over
458 in the initial shift state. */
459 *out++ = 0xdc00 + *in++;
460 argsize--;
461 memset(&mbs, 0, sizeof mbs);
462 continue;
463 }
464 if (*out >= 0xd800 && *out <= 0xdfff) {
465 /* Surrogate character. Escape the original
466 byte sequence with surrogateescape. */
467 argsize -= converted;
468 while (converted--)
469 *out++ = 0xdc00 + *in++;
470 continue;
471 }
472 /* successfully converted some bytes */
473 in += converted;
474 argsize -= converted;
475 out++;
476 }
477 #else
478 /* Cannot use C locale for escaping; manually escape as if charset
479 is ASCII (i.e. escape all bytes > 128. This will still roundtrip
480 correctly in the locale's charset, which must be an ASCII superset. */
481 res = PyMem_Malloc((strlen(arg)+1)*sizeof(wchar_t));
482 if (!res) goto oom;
483 in = (unsigned char*)arg;
484 out = res;
485 while(*in)
486 if(*in < 128)
487 *out++ = *in++;
488 else
489 *out++ = 0xdc00 + *in++;
490 *out = 0;
491 #endif
492 return res;
493 oom:
494 fprintf(stderr, "out of memory\n");
495 return NULL;
496 }
497
498 /* Encode a (wide) character string to the locale encoding with the
499 surrogateescape error handler (characters in range U+DC80..U+DCFF are
500 converted to bytes 0x80..0xFF).
501
502 This function is the reverse of _Py_char2wchar().
503
504 Return a pointer to a newly allocated byte string (use PyMem_Free() to free
505 the memory), or NULL on error (conversion error or memory error). */
506 char*
507 _Py_wchar2char(const wchar_t *text)
508 {
509 const size_t len = wcslen(text);
510 char *result = NULL, *bytes = NULL;
511 size_t i, size, converted;
512 wchar_t c, buf[2];
513
514 /* The function works in two steps:
515 1. compute the length of the output buffer in bytes (size)
516 2. outputs the bytes */
517 size = 0;
518 buf[1] = 0;
519 while (1) {
520 for (i=0; i < len; i++) {
521 c = text[i];
522 if (c >= 0xdc80 && c <= 0xdcff) {
523 /* UTF-8b surrogate */
524 if (bytes != NULL) {
525 *bytes++ = c - 0xdc00;
526 size--;
527 }
528 else
529 size++;
530 continue;
531 }
532 else {
533 buf[0] = c;
534 if (bytes != NULL)
535 converted = wcstombs(bytes, buf, size);
536 else
537 converted = wcstombs(NULL, buf, 0);
538 if (converted == (size_t)-1) {
539 if (result != NULL)
540 PyMem_Free(result);
541 return NULL;
542 }
543 if (bytes != NULL) {
544 bytes += converted;
545 size -= converted;
546 }
547 else
548 size += converted;
549 }
550 }
551 if (result != NULL) {
552 *bytes = 0;
553 break;
554 }
555
556 size += 1; /* nul byte at the end */
557 result = PyMem_Malloc(size);
558 if (result == NULL)
559 return NULL;
560 bytes = result;
561 }
562 return result;
563 }
564
565 #if defined(MS_WINDOWS) || defined(HAVE_STAT)
566 int
567 _Py_wstat(const wchar_t* path, struct stat *buf)
568 {
569 /* In principle, this should use HAVE__WSTAT, and _wstat
570 should be detected by autoconf. However, no current
571 POSIX system provides that function, so testing for
572 it is pointless.
573 Not sure whether the MS_WINDOWS guards are necessary:
574 perhaps for cygwin/mingw builds?
575 */
576 #ifdef MS_WINDOWS
577 return _wstat(path, buf);
578 #else
579 int err;
580 char *fname;
581 fname = _Py_wchar2char(path);
582 if (fname == NULL) {
583 errno = EINVAL;
584 return -1;
585 }
586 err = stat(fname, buf);
587 PyMem_Free(fname);
588 return err;
589 #endif
590 }
591 #endif
592
593 /* Call _wstat() on Windows, or stat() otherwise. Only fill st_mode
594 attribute on Windows. Return 0 on success, -1 on stat error or (if
595 PyErr_Occurred()) unicode error. */
596
597 int
598 _Py_stat(PyObject *unicode, struct stat *statbuf)
599 {
600 #ifdef MS_WINDOWS
601 wchar_t *path;
602 int err;
603 struct _stat wstatbuf;
604
605 path = PyUnicode_AsWideCharString(unicode, NULL);
606 if (path == NULL)
607 return -1;
608 err = _wstat(path, &wstatbuf);
609 PyMem_Free(path);
610 if (!err)
611 statbuf->st_mode = wstatbuf.st_mode;
612 return err;
613 #else
614 int ret;
615 PyObject *bytes = PyUnicode_EncodeFSDefault(unicode);
616 if (bytes == NULL)
617 return -1;
618 ret = stat(PyBytes_AS_STRING(bytes), statbuf);
619 Py_DECREF(bytes);
620 return ret;
621 #endif
622 }
623
624 FILE *
625 _Py_wfopen(const wchar_t *path, const wchar_t *mode)
626 {
627 #ifndef MS_WINDOWS
628 FILE *f;
629 char *cpath;
630 char cmode[10];
631 size_t r;
632 r = wcstombs(cmode, mode, 10);
633 if (r == (size_t)-1 || r >= 10) {
634 errno = EINVAL;
635 return NULL;
636 }
637 cpath = _Py_wchar2char(path);
638 if (cpath == NULL)
639 return NULL;
640 f = fopen(cpath, cmode);
641 PyMem_Free(cpath);
642 return f;
643 #else
644 return _wfopen(path, mode);
645 #endif
646 }
647
648 /* Call _wfopen() on Windows, or fopen() otherwise. Return the new file
649 object on success, or NULL if the file cannot be open or (if
650 PyErr_Occurred()) on unicode error */
651
652 FILE*
653 _Py_fopen(PyObject *unicode, const char *mode)
654 {
655 #ifdef MS_WINDOWS
656 wchar_t *path;
657 wchar_t wmode[10];
658 int usize;
659 FILE *f;
660
661 usize = MultiByteToWideChar(CP_ACP, 0, mode, -1, wmode, sizeof(wmode));
662 if (usize == 0)
663 return NULL;
664
665 path = PyUnicode_AsWideCharString(unicode, NULL);
666 if (path == NULL)
667 return NULL;
668 f = _wfopen(path, wmode);
669 PyMem_Free(path);
670 return f;
671 #else
672 FILE *f;
673 PyObject *bytes = PyUnicode_EncodeFSDefault(unicode);
674 if (bytes == NULL)
675 return NULL;
676 f = fopen(PyBytes_AS_STRING(bytes), mode);
677 Py_DECREF(bytes);
678 return f;
679 #endif
680 }
681
682 #ifdef HAVE_READLINK
683 int
684 _Py_wreadlink(const wchar_t *path, wchar_t *buf, size_t bufsiz)
685 {
686 char *cpath;
687 char cbuf[PATH_MAX];
688 int res;
689 size_t r1;
690
691 cpath = _Py_wchar2char(path);
692 if (cpath == NULL) {
693 errno = EINVAL;
694 return -1;
695 }
696 res = (int)readlink(cpath, cbuf, PATH_MAX);
697 PyMem_Free(cpath);
698 if (res == -1)
699 return -1;
700 if (res == PATH_MAX) {
701 errno = EINVAL;
702 return -1;
703 }
704 cbuf[res] = '\0'; /* buf will be null terminated */
705 r1 = mbstowcs(buf, cbuf, bufsiz);
706 if (r1 == -1) {
707 errno = EINVAL;
708 return -1;
709 }
710 return (int)r1;
711 }
712 #endif
713
714 #ifdef HAVE_REALPATH
715 wchar_t*
716 _Py_wrealpath(const wchar_t *path, wchar_t *resolved_path)
717 {
718 char *cpath;
719 char cresolved_path[PATH_MAX];
720 char *res;
721 size_t r;
722 cpath = _Py_wchar2char(path);
723 if (cpath == NULL) {
724 errno = EINVAL;
725 return NULL;
726 }
727 res = realpath(cpath, cresolved_path);
728 PyMem_Free(cpath);
729 if (res == NULL)
730 return NULL;
731 r = mbstowcs(resolved_path, cresolved_path, PATH_MAX);
732 if (r == (size_t)-1 || r >= PATH_MAX) {
733 errno = EINVAL;
734 return NULL;
735 }
736 return resolved_path;
737 }
738 #endif
739
740 wchar_t*
741 _Py_wgetcwd(wchar_t *buf, size_t size)
742 {
743 #ifdef MS_WINDOWS
744 return _wgetcwd(buf, size);
745 #else
746 char fname[PATH_MAX];
747 if (getcwd(fname, PATH_MAX) == NULL)
748 return NULL;
749 if (mbstowcs(buf, fname, size) >= size) {
750 errno = ERANGE;
751 return NULL;
752 }
753 return buf;
754 #endif
755 }
756
757 #endif
758