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71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
#pragma once
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#include "config.h"
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#ifndef HAVE_VERSIONSORT
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/* Copyright © 2005-2014 Rich Felker, et al.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <ctype.h>
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#include <string.h>
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#include <dirent.h>
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static int
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strverscmp(const char *l0, const char *r0)
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{
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const unsigned char *l = (const void *)l0;
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const unsigned char *r = (const void *)r0;
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size_t i, dp, j;
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int z = 1;
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/* Find maximal matching prefix and track its maximal digit
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* suffix and whether those digits are all zeros. */
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for (dp=i=0; l[i]==r[i]; i++) {
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int c = l[i];
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if (!c) return 0;
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if (!isdigit(c)) dp=i+1, z=1;
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else if (c!='0') z=0;
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}
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if (l[dp]!='0' && r[dp]!='0') {
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/* If we're not looking at a digit sequence that began
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* with a zero, longest digit string is greater. */
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for (j=i; isdigit(l[j]); j++)
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if (!isdigit(r[j])) return 1;
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if (isdigit(r[j])) return -1;
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} else if (z && dp<i && (isdigit(l[i]) || isdigit(r[i]))) {
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/* Otherwise, if common prefix of digit sequence is
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* all zeros, digits order less than non-digits. */
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return (unsigned char)(l[i]-'0') - (unsigned char)(r[i]-'0');
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}
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return l[i] - r[i];
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}
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static int
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versionsort(const struct dirent **a, const struct dirent **b)
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{
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return strverscmp((*a)->d_name, (*b)->d_name);
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}
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#endif
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