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https://github.com/jart/cosmopolitan.git
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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/' ```
73 lines
3.2 KiB
C
73 lines
3.2 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 2021 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/errno.h"
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#include "libc/intrin/pcmpgtb.h"
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#include "libc/intrin/pmovmskb.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "net/http/escape.h"
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/**
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* Encodes UTF-8 to ISO-8859-1.
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*
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* @param p is input value
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* @param n if -1 implies strlen
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* @param z if non-NULL receives output length
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* @param f can kControlC0, kControlC1, kControlWs to forbid
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* @return allocated NUL-terminated buffer, or NULL w/ errno
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* @error EILSEQ means UTF-8 found we can't or won't re-encode
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* @error ENOMEM means malloc() failed
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*/
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char *EncodeLatin1(const char *p, size_t n, size_t *z, int f) {
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int c;
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size_t i;
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char t[256];
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char *r, *q;
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bzero(t, sizeof(t));
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if (f & kControlC0) memset(t + 0x00, 1, 0x20 - 0x00), t[0x7F] = 1;
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if (f & kControlC1) memset(t + 0x80, 1, 0xA0 - 0x80);
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t['\t'] = t['\r'] = t['\n'] = t['\v'] = !!(f & kControlWs);
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if (z) *z = 0;
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if (n == -1) n = p ? strlen(p) : 0;
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if ((q = r = malloc(n + 1))) {
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for (i = 0; i < n;) {
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c = p[i++] & 0xff;
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if (c >= 0300) {
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if ((c <= 0303) && i < n && (p[i] & 0300) == 0200) {
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c = (c & 037) << 6 | (p[i++] & 077);
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} else {
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goto Invalid;
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}
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}
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if (t[c]) {
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goto Invalid;
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}
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*q++ = c;
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}
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if (z) *z = q - r;
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*q++ = '\0';
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if ((q = realloc(r, q - r))) r = q;
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}
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return r;
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Invalid:
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free(r);
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errno = EILSEQ;
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return NULL;
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}
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