43 lines
1.8 KiB
C
43 lines
1.8 KiB
C
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/*
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Copyright (C) 1995 Ian Jackson <iwj10@cus.cam.ac.uk>
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Copyright (C) 2001 Anthony Towns <aj@azure.humbug.org.au>
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Copyright (C) 2008-2020 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#ifndef FILEVERCMP_H
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#define FILEVERCMP_H
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/* Compare version strings:
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This function compares strings S1 and S2:
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1) By PREFIX in the same way as strcmp.
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2) Then by VERSION (most similarly to version compare of Debian's dpkg).
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Leading zeros in version numbers are ignored.
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3) If both (PREFIX and VERSION) are equal, strcmp function is used for
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comparison. So this function can return 0 if (and only if) strings S1
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and S2 are identical.
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It returns number >0 for S1 > S2, 0 for S1 == S2 and number <0 for S1 < S2.
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This function compares strings, in a way that if VER1 and VER2 are version
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numbers and PREFIX and SUFFIX (SUFFIX defined as (\.[A-Za-z~][A-Za-z0-9~]*)*)
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are strings then VER1 < VER2 implies filevercmp (PREFIX VER1 SUFFIX,
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PREFIX VER2 SUFFIX) < 0.
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This function is intended to be a replacement for strverscmp. */
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int filevercmp (const char *s1, const char *s2) _GL_ATTRIBUTE_PURE;
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#endif /* FILEVERCMP_H */
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