mirror of
https://github.com/jart/cosmopolitan.git
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95 lines
3.8 KiB
C
95 lines
3.8 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/assert.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/str/str.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Returns current working directory, e.g.
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*
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* const char *dirname = gc(getcwd(0,0)); // if malloc is linked
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* const char *dirname = getcwd(alloca(PATH_MAX),PATH_MAX);
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*
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* @param buf is where UTF-8 NUL-terminated path string gets written,
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* which may be NULL to ask this function to malloc a buffer
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* @param size is number of bytes available in buf, e.g. PATH_MAX+1,
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* which may be 0 if buf is NULL
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* @return buf containing system-normative path or NULL w/ errno
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* @error ERANGE, EINVAL, ENOMEM
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*/
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char *getcwd(char *buf, size_t size) {
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char *p, *r;
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if (buf) {
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p = buf;
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if (!size) {
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einval();
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STRACE("getcwd(%p, %'zu) %m", buf, size);
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return 0;
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}
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} else if (weaken(malloc)) {
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assert(!__vforked);
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if (!size) size = PATH_MAX;
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if (!(p = weaken(malloc)(size))) {
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STRACE("getcwd(%p, %'zu) %m", buf, size);
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return 0;
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}
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} else {
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einval();
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STRACE("getcwd() needs buf≠0 or STATIC_YOINK(\"malloc\")");
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return 0;
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}
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*p = '\0';
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if (!IsWindows()) {
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if (IsMetal()) {
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r = size >= 5 ? strcpy(p, "/zip") : 0;
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} else if (IsXnu()) {
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r = sys_getcwd_xnu(p, size);
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} else if (sys_getcwd(p, size) != (void *)-1) {
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r = p;
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} else {
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r = 0;
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}
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} else {
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r = sys_getcwd_nt(p, size);
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}
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if (!buf) {
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if (!r) {
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if (weaken(free)) {
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weaken(free)(p);
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}
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} else {
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if (weaken(realloc)) {
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if ((p = weaken(realloc)(r, strlen(r) + 1))) {
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r = p;
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}
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}
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}
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}
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STRACE("getcwd(%p, %'zu) → %#s", buf, size, r);
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return r;
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}
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