| 1 | /* Truncate a file given by name. Generic POSIX.1 version. |
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| 2 | Copyright (C) 1995-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <sys/types.h> |
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| 20 | #include <errno.h> |
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| 21 | #include <unistd.h> |
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| 22 | #include <fcntl.h> |
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| 23 | |
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| 24 | /* Truncate PATH to LENGTH bytes. */ |
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| 25 | int |
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| 26 | __truncate (const char *path, off_t length) |
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| 27 | { |
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| 28 | int fd, ret, save; |
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| 29 | |
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| 30 | fd = __open (path, O_WRONLY | (length == 0 ? O_TRUNC : 0)); |
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| 31 | if (fd < 0) |
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| 32 | return -1; |
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| 33 | |
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| 34 | if (length == 0) |
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| 35 | ret = 0; |
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| 36 | else |
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| 37 | ret = __ftruncate (fd: fd, length: length); |
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| 38 | save = errno; |
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| 39 | (void) __close (fd); |
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| 40 | if (ret < 0) |
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| 41 | __set_errno (save); |
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| 42 | return ret; |
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| 43 | } |
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| 44 | weak_alias (__truncate, truncate) |
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| 45 | |
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