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https://github.com/jart/cosmopolitan.git
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a1677d605a
If we keep making changes like this, redbean might not be a toy anymore. Additional steps are also being taken now to prevent ANSI control codes sent by the client from slipping into logs.
93 lines
3.7 KiB
C
93 lines
3.7 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 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/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 "libc/str/tpenc.h"
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#include "net/http/http.h"
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/**
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* Filters out control codes from string.
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*
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* This is useful for logging data like HTTP messages, where we don't
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* want full blown C string literal escaping, but we don't want things
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* like raw ANSI control codes from untrusted devices in our terminals.
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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 buffer, or NULL w/ errno
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*/
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char *VisualizeControlCodes(const char *data, size_t size, size_t *out_size) {
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uint64_t w;
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char *r, *q;
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unsigned i, n;
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wint_t x, a, b;
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const char *p, *e;
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if (size == -1) size = strlen(data);
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if ((r = malloc(size * 6 + 1))) {
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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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a = ThomPikeByte(x);
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n = ThomPikeLen(x) - 1;
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if (p + n <= e) {
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for (i = 0;;) {
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b = p[i] & 0xff;
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if (!ThomPikeCont(b)) break;
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a = ThomPikeMerge(a, b);
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if (++i == n) {
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x = a;
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p += i;
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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 (0x80 <= x && x < 0xA0) {
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q[0] = '\\';
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q[1] = 'u';
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q[2] = '0';
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q[3] = '0';
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q[4] = "0123456789abcdef"[(x & 0xF0) >> 4];
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q[5] = "0123456789abcdef"[(x & 0x0F) >> 0];
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q += 6;
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} else {
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if (0x00 <= x && x < 0x20) {
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if (x != '\t' && x != '\r' && x != '\n') {
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x += 0x2400; /* Control Pictures */
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}
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} else if (x == 0x7F) {
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x = 0x2421;
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}
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w = tpenc(x);
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do {
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*q++ = w;
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} while ((w >>= 8));
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}
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}
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if (out_size) *out_size = 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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}
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