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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/' ```
91 lines
3.5 KiB
C
91 lines
3.5 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/mem/mem.h"
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#include "libc/str/str.h"
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#include "libc/str/thompike.h"
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#include "net/http/escape.h"
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/**
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* Encodes HTTP header value.
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*
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* This operation involves the following:
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*
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* 1. Trim whitespace.
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* 2. Turn UTF-8 into ISO-8859-1.
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* 3. Make sure no C0 or C1 control codes are present (except tab).
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*
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* If the input value isn't thompson-pike encoded then this
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* implementation will fall back to latin1 in most cases.
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*
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* @param data is input value
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* @param size if -1 implies strlen
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* @param out_size if non-NULL receives output length on success
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* @return allocated NUL-terminated string, or NULL w/ errno
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*/
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char *EncodeHttpHeaderValue(const char *data, size_t size, size_t *out_size) {
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bool t;
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wint_t x;
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size_t n;
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char *r, *q;
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const char *p, *e;
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if (size == -1) size = data ? strlen(data) : 0;
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if ((r = malloc(size + 1))) {
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t = 0;
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q = r;
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p = data;
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e = p + size;
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while (p < e) {
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x = *p++ & 0xff;
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if (x >= 0300) {
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if (p < e && ThomPikeCont(*p)) {
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if (ThomPikeLen(x) == 2) {
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x = ThomPikeMerge(ThomPikeByte(x), *p++);
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} else {
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x = 0;
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}
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}
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}
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if (!t) {
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if (x == ' ' || x == '\t') {
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continue;
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} else {
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t = true;
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}
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}
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if ((0x20 <= x && x <= 0x7E) || (0xA0 <= x && x <= 0xFF) || x == '\t') {
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*q++ = x;
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} else {
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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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}
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while (q > r && (q[-1] == ' ' || q[-1] == '\t')) --q;
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n = q - r;
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*q++ = '\0';
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if ((q = realloc(r, q - r))) r = q;
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} else {
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n = 0;
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}
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if (out_size) {
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*out_size = n;
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}
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return r;
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}
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