56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_DOSENVIRON_H_
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#define COSMOPOLITAN_LIBC_DOSENVIRON_H_
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#ifndef __STRICT_ANSI__
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#include "libc/bits/safemacros.internal.h"
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#include "libc/str/appendchar.h"
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#include "libc/str/str.h"
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#include "libc/str/utf16.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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wint_t wc;
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size_t envc;
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char *p, *pe;
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bool endstring;
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const char16_t *s;
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s = env;
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envc = 0;
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if (size) {
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p = buf;
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pe = buf + size - 1;
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if (p < pe) {
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wc = DecodeNtsUtf16(&s);
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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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do {
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AppendChar(&p, pe, wc);
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endstring = !wc;
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wc = DecodeNtsUtf16(&s);
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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 /* !ANSI */
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#endif /* COSMOPOLITAN_LIBC_DOSENVIRON_H_ */
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