65 lines
3.0 KiB
C
65 lines
3.0 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/alg/alg.h"
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#include "libc/alg/arraylist.internal.h"
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#include "libc/calls/hefty/ntspawn.h"
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#include "libc/dce.h"
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#include "libc/str/str.h"
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static int CompareStrings(const char *l, const char *r) {
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size_t i = 0;
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while (l[i] == r[i] && r[i]) ++i;
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return (l[i] & 0xff) - (r[i] & 0xff);
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}
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static void SortStrings(char **a, size_t n) {
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char *t;
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size_t i, j;
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for (i = 1; i < n; ++i) {
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for (t = a[i], j = i; j > 0 && CompareStrings(t, a[j - 1]) < 0; --j) {
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a[j] = a[j - 1];
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}
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a[j] = t;
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}
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}
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/**
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* Copies environment variable pointers and sorts them.
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*
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* This is useful for (a) binary searching; and (b) keeping the NT
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* Executive happy, which wants strings to be ordered by UNICODE
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* codepoint identifiers. That's basically what uint8_t comparisons on
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* UTF8-encoded data gives us.
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*
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* @param envp is a NULL-terminated string array
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* @return newly allocated sorted copy of envp pointer array
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*/
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hidden textwindows nodiscard char **sortenvp(char *const envp[]) {
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char **copy;
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size_t n, size;
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n = 0;
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while (envp[n]) n++;
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size = (n + 1) * sizeof(char *);
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if ((copy = malloc(size))) {
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memcpy(copy, envp, size);
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SortStrings(copy, n);
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}
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return copy;
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}
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