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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
77 lines
3.3 KiB
C
77 lines
3.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/calls/calls.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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* @raise EACCES if the current directory path couldn't be accessed
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* @raise ERANGE if `size` wasn't big enough for path and nul byte
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* @raise ENOMEM on failure to allocate the requested buffer
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* @raise EINVAL if `size` is zero and `buf` is non-null
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* @raise EFAULT if `buf` points to invalid memory
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*/
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char *getcwd(char *buf, size_t size) {
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// setup memory per api
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char *path;
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if (buf) {
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path = buf;
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if (!size) {
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einval();
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return 0;
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}
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} else {
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if (!size) size = 4096;
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if (!(path = malloc(size))) {
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return 0; // enomem
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}
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}
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// invoke the real system call
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int got = __getcwd(path, size);
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if (got == -1) {
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if (path != buf) {
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free(path);
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}
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return 0; // eacces, erange, or efault
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}
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// cut allocation down to size
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if (path != buf) {
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char *p;
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if ((p = realloc(path, strlen(path) + 1))) {
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path = p;
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}
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}
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// return result
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return path;
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}
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