diff options
Diffstat (limited to 'mysys/my_chsize.c')
| -rw-r--r-- | mysys/my_chsize.c | 109 |
1 files changed, 59 insertions, 50 deletions
diff --git a/mysys/my_chsize.c b/mysys/my_chsize.c index 06e8f159f4a..8e46b0808c0 100644 --- a/mysys/my_chsize.c +++ b/mysys/my_chsize.c @@ -30,74 +30,83 @@ MyFlags Flags DESCRIPTION - my_chsize() truncates file if shorter, else fill with the filler character + my_chsize() truncates file if shorter else fill with the filler character RETURN VALUE 0 Ok 1 Error */ - int my_chsize(File fd, my_off_t newlength, int filler, myf MyFlags) { + my_off_t oldsize; + char buff[IO_SIZE]; DBUG_ENTER("my_chsize"); DBUG_PRINT("my",("fd: %d length: %lu MyFlags: %d",fd,(ulong) newlength, MyFlags)); -#ifdef HAVE_CHSIZE - if (chsize(fd,(off_t) newlength)) + oldsize = my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE)); + DBUG_PRINT("info",("old_size: %ld", (ulong) oldsize)); + + if (oldsize > newlength) +#if defined(HAVE_SETFILEPOINTER) + /* This is for the moment only true on windows */ { - DBUG_PRINT("error",("errno: %d",errno)); - my_errno=errno; - if (MyFlags & MY_WME) - my_error(EE_CANT_CHSIZE,MYF(ME_BELL+ME_WAITTANG),errno); - DBUG_RETURN(1); + HANDLE win_file= (HANDLE) _get_osfhandle(fd); + long length_low, length_high; + length_low= (long) (ulong) newlength; + length_high= (long) ((ulonglong) newlength >> 32); + if (SetFilePointer(win_file, length_low, &length_high, FILE_BEGIN)) + { + if (SetEndOfFile(win_file)) + DBUG_RETURN(0); + } + my_errno= errno; + goto err; } - DBUG_RETURN(0); -#else - /* if file is shorter, expand with null, else fill unused part with null */ +#elif defined(HAVE_FTRUNCATE) { - my_off_t oldsize; - char buff[IO_SIZE]; - - oldsize = my_seek(fd, 0L, MY_SEEK_END, MYF(MY_WME+MY_FAE)); - DBUG_PRINT("info",("old_size: %ld", (ulong) oldsize)); - -#ifdef HAVE_FTRUNCATE - if (oldsize > newlength) + if (ftruncate(fd, (off_t) newlength)) { - if (ftruncate(fd, (off_t) newlength)) - { - my_errno=errno; - DBUG_PRINT("error",("errno: %d",errno)); - if (MyFlags & MY_WME) - my_error(EE_CANT_CHSIZE, MYF(ME_BELL+ME_WAITTANG), errno); - DBUG_RETURN(1); - } - DBUG_RETURN(0); - } -#else - if (oldsize > newlength) - { /* Fill diff with null */ - VOID(my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE))); - swap(my_off_t, newlength, oldsize); + my_errno= errno; + goto err; } -#endif - /* Full file with 0 until it's as big as requested */ - bfill(buff, IO_SIZE, filler); - while (newlength-oldsize > IO_SIZE) + DBUG_RETURN(0); + } +#elif defined(HAVE_CHSIZE) + { + if (chsize(fd, (off_t) newlength)) { - if (my_write(fd,(byte*) buff,IO_SIZE,MYF(MY_NABP))) - goto err; - oldsize+= IO_SIZE; - } - if (my_write(fd,(byte*) buff,(uint) (newlength-oldsize),MYF(MY_NABP))) + my_errno=errno; goto err; + } DBUG_RETURN(0); - err: - if (MyFlags & MY_WME) - my_error(EE_CANT_CHSIZE,MYF(ME_BELL+ME_WAITTANG),my_errno); - DBUG_PRINT("error",("errno: %d",my_errno)); - DBUG_RETURN(1); + } +#else + { + /* + Fill space between requested length and true length with 'filler' + We should never come here on any modern machine + */ + VOID(my_seek(fd, newlength, MY_SEEK_SET, MYF(MY_WME+MY_FAE))); + swap(my_off_t, newlength, oldsize); } #endif -} /* my_chsize */ + + /* Full file with 'filler' until it's as big as requested */ + bfill(buff, IO_SIZE, filler); + while (newlength-oldsize > IO_SIZE) + { + if (my_write(fd,(byte*) buff,IO_SIZE,MYF(MY_NABP))) + goto err; + oldsize+= IO_SIZE; + } + if (my_write(fd,(byte*) buff,(uint) (newlength-oldsize),MYF(MY_NABP))) + goto err; + DBUG_RETURN(0); + +err: + DBUG_PRINT("error", ("errno: %d", errno)); + if (MyFlags & MY_WME) + my_error(EE_CANT_CHSIZE, MYF(ME_BELL+ME_WAITTANG), my_errno); + DBUG_RETURN(1); +} /* my_chsize */ |