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