mirror of
https://github.com/jart/cosmopolitan.git
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70 lines
3.1 KiB
C
70 lines
3.1 KiB
C
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/*-*- 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 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 "libc/str/thompike.h"
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#include "net/http/escape.h"
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/**
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* Returns true if C0 or C1 control codes are present
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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 f can have kControlWs, kControlC0, kControlC1 to forbid
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* @return true if forbidden characters were found
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* @see VisualizeControlCodes()
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*/
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bool HasControlCodes(const char *p, size_t n, int f) {
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int c;
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wint_t x, a, b;
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size_t i, j, m;
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if (n == -1) n = p ? strlen(p) : 0;
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for (i = 0; i < n;) {
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x = p[i++] & 0xff;
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if (x >= 0300) {
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a = ThomPikeByte(x);
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m = ThomPikeLen(x) - 1;
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if (i + m <= n) {
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for (j = 0;;) {
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b = p[i + j] & 0xff;
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if (!ThomPikeCont(b)) break;
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a = ThomPikeMerge(a, b);
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if (++j == m) {
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x = a;
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i += j;
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break;
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}
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}
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}
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}
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if (((f & kControlC1) && 0x80 <= x && x < 0xA0) ||
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((f & kControlC0) && (x < 32 || x == 0x7F) &&
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!(x == '\t' || x == '\r' || x == '\n' || x == '\v')) ||
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((f & kControlWs) &&
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(x == '\t' || x == '\r' || x == '\n' || x == '\v'))) {
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return true;
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}
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}
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return false;
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}
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