| 1 | /*
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| 2 | Copyright (C) 1995 Ian Jackson <iwj10@cus.cam.ac.uk>
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| 3 | Copyright (C) 2001 Anthony Towns <aj@azure.humbug.org.au>
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| 4 | Copyright (C) 2008-2016 Free Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software: you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation, either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>. */
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| 18 |
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| 19 | #ifndef FILEVERCMP_H
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| 20 | #define FILEVERCMP_H
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| 21 |
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| 22 | /* Compare version strings:
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| 23 |
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| 24 | This function compares strings S1 and S2:
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| 25 | 1) By PREFIX in the same way as strcmp.
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| 26 | 2) Then by VERSION (most similarly to version compare of Debian's dpkg).
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| 27 | Leading zeros in version numbers are ignored.
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| 28 | 3) If both (PREFIX and VERSION) are equal, strcmp function is used for
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| 29 | comparison. So this function can return 0 if (and only if) strings S1
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| 30 | and S2 are identical.
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| 31 |
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| 32 | It returns number >0 for S1 > S2, 0 for S1 == S2 and number <0 for S1 < S2.
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| 33 |
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| 34 | This function compares strings, in a way that if VER1 and VER2 are version
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| 35 | numbers and PREFIX and SUFFIX (SUFFIX defined as (\.[A-Za-z~][A-Za-z0-9~]*)*)
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| 36 | are strings then VER1 < VER2 implies filevercmp (PREFIX VER1 SUFFIX,
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| 37 | PREFIX VER2 SUFFIX) < 0.
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| 38 |
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| 39 | This function is intended to be a replacement for strverscmp. */
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| 40 | int filevercmp (const char *s1, const char *s2) _GL_ATTRIBUTE_PURE;
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| 41 |
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| 42 | #endif /* FILEVERCMP_H */
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