68 lines
3.3 KiB
C
68 lines
3.3 KiB
C
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/*-*- 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=8 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#ifndef COSMOPOLITAN_LIBC_DOSENVIRON_H_
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#define COSMOPOLITAN_LIBC_DOSENVIRON_H_
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#include "libc/bits/safemacros.h"
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#include "libc/str/appendchar.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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/**
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* Transcodes NT environment variable block from UTF-16 to UTF-8.
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*
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* @param env is a double NUL-terminated block of key=values
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* @param buf is the new environment
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* @param size is the byte capacity of buf
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* @param envp stores NULL-terminated string pointer list
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* @param max is the pointer count capacity of envp
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* @return number of variables decoded, excluding NULL-terminator
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*/
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static inline int getdosenviron(const char16_t *env, char *buf, size_t size,
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char **envp, size_t max) {
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const char16_t *s = env;
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size_t envc = 0;
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if (size) {
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wint_t wc;
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char *p = buf;
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char *pe = buf + size - 1;
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if (p < pe) {
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s += getutf16(s, &wc);
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while (wc) {
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if (++envc < max) {
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envp[envc - 1] = p < pe ? p : NULL;
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}
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bool endstring;
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do {
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AppendChar(&p, pe, wc);
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endstring = !wc;
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s += getutf16(s, &wc);
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} while (!endstring);
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buf[min(p - buf, size - 2)] = u'\0';
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}
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}
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AppendChar(&p, pe, '\0');
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buf[min(p - buf, size - 1)] = u'\0';
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}
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if (max) envp[min(envc, max - 1)] = NULL;
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return envc;
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}
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#endif /* COSMOPOLITAN_LIBC_DOSENVIRON_H_ */
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