mirror of
https://github.com/jart/cosmopolitan.git
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95 lines
3.9 KiB
C
95 lines
3.9 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/arraylist2.internal.h"
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#include "libc/calls/ntspawn.h"
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#include "libc/fmt/conv.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/mem/mem.h"
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#include "libc/str/oldutf16.internal.h"
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#include "libc/str/str.h"
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#include "libc/str/thompike.h"
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#include "libc/str/tpdecode.internal.h"
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#include "libc/str/utf16.h"
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#include "libc/sysv/errfuns.h"
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static noasan 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 noasan void InsertString(char **a, size_t i, char *s) {
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size_t j;
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for (j = i; j > 0 && CompareStrings(s, a[j - 1]) < 0; --j) {
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a[j] = a[j - 1];
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}
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a[j] = s;
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}
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/**
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* Copies sorted environment variable block for Windows.
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*
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* This is designed to meet the requirements of CreateProcess().
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*
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* @param envvars receives sorted double-NUL terminated string list
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* @param envp is an a NULL-terminated array of UTF-8 strings
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* @param extravar is a VAR=val string we consider part of envp or NULL
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* @return 0 on success, or -1 w/ errno
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* @error E2BIG if total number of shorts exceeded ARG_MAX (0x8000)
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*/
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textwindows noasan int mkntenvblock(char16_t envvars[ARG_MAX],
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char *const envp[], const char *extravar) {
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char *t;
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axdx_t rc;
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uint64_t w;
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char **vars;
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wint_t x, y;
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size_t i, j, k, n, m;
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for (n = 0; envp[n];) n++;
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vars = alloca((n + 1) * sizeof(char *));
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for (i = 0; i < n; ++i) InsertString(vars, i, envp[i]);
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if (extravar) InsertString(vars, n++, extravar);
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for (k = i = 0; i < n; ++i) {
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j = 0;
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do {
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x = vars[i][j++] & 0xff;
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if (x >= 0200) {
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if (x < 0300) continue;
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m = ThomPikeLen(x);
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x = ThomPikeByte(x);
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while (--m) {
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if ((y = vars[i][j++] & 0xff)) {
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x = ThomPikeMerge(x, y);
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} else {
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x = 0;
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break;
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}
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}
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}
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w = EncodeUtf16(x);
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do {
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envvars[k++] = w & 0xffff;
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if (k == ARG_MAX) return e2big();
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} while ((w >>= 16));
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} while (x);
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}
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envvars[k] = u'\0';
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return 0;
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}
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