cosmopolitan/libc/runtime/getdosenviron.c
Justine Tunney 4e56d89dcd Eliminate some flakes
- Get ASAN working on Windows.

- Deleting directories and then recreating them with the same name in a
  short period of time appears to be a no-no on Windows.

- There's no reason to call FlushFileBuffers on close() for pipes, and
  it's harmful since it might block indefinitely for no good reason.
2021-02-03 06:25:27 -08:00

74 lines
3.3 KiB
C

/*-*- 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 │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/str/tpenc.h"
#include "libc/str/utf16.h"
static textwindows noasan axdx_t Recode16to8(char *dst, size_t dstsize,
const char16_t *src) {
axdx_t r;
uint64_t w;
wint_t x, y;
for (r.ax = 0, r.dx = 0;;) {
if (!(x = src[r.dx++])) break;
if (IsUtf16Cont(x)) continue;
if (!IsUcs2(x)) {
if (!(y = src[r.dx++])) break;
x = MergeUtf16(x, y);
}
for (w = tpenc(x); w && r.ax + 1 < dstsize; w >>= 8) {
dst[r.ax++] = w & 0xFF;
}
}
if (r.ax < dstsize) {
dst[r.ax] = 0;
}
return r;
}
/**
* Transcodes NT environment variable block from UTF-16 to UTF-8.
*
* @param env is a double NUL-terminated block of key=values
* @param buf is the new environment which gets double-nul'd
* @param size is the byte capacity of buf
* @param envp stores NULL-terminated string pointer list (optional)
* @param max is the pointer count capacity of envp
* @return number of variables decoded, excluding NULL-terminator
*/
textwindows noasan int GetDosEnviron(const char16_t *env, char *buf,
size_t size, char **envp, size_t max) {
int i;
axdx_t r;
i = 0;
if (size) {
--size;
while (*env) {
if (i + 1 < max) envp[i++] = buf;
r = Recode16to8(buf, size, env);
size -= r.ax + 1;
buf += r.ax + 1;
env += r.dx;
}
*buf = '\0';
}
if (i < max) envp[i] = NULL;
return i;
}