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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/calls/hefty/mkntenvblock.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/alg/arraylist2.h"
#include "libc/calls/hefty/ntspawn.h"
#include "libc/conv/conv.h"
#include "libc/macros.h"
#include "libc/mem/mem.h"
#include "libc/str/str.h"
#include "libc/sysv/errfuns.h"
/**
* Copies sorted environment variable block for Windows.
*
* This is designed to meet the requirements of CreateProcess().
*
* @param envp is an a NULL-terminated array of UTF-8 strings
* @return freshly allocated lpEnvironment or NULL w/ errno
*/
textwindows char16_t *mkntenvblock(char *const envp[]) {
size_t block_i = 0;
size_t block_n = 0;
char16_t *block_p = NULL;
size_t i, j;
if (!(envp = sortenvp(envp))) goto error;
const char16_t kNul = u'\0';
for (i = 0; envp[i]; ++i) {
unsigned consumed;
for (j = 0;; j += consumed) {
wint_t wc;
char16_t cbuf[2];
consumed = abs(tpdecode(&envp[i][j], &wc));
if (CONCAT(&block_p, &block_i, &block_n, cbuf,
abs(pututf16(cbuf, ARRAYLEN(cbuf), wc, false))) == -1) {
goto error;
}
if (!wc) break;
}
}
if (APPEND(&block_p, &block_i, &block_n, &kNul) == -1) {
goto error;
}
if (block_i > ENV_MAX) {
e2big();
goto error;
}
free(envp);
return block_p;
error:
free(envp);
free(block_p);
return NULL;
}