mirror of
https://github.com/jart/cosmopolitan.git
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90 lines
3.3 KiB
C
90 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 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/x/x.h"
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#include "net/http/escape.h"
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/**
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* Escapes HTML entities.
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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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* @return allocated NUL-terminated buffer, or NULL w/ errno
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*/
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char *EscapeHtml(const char *p, size_t n, size_t *z) {
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int c;
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size_t i;
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char *q, *r;
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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 * 6 + 1))) {
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for (i = 0; i < n; ++i) {
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switch ((c = p[i])) {
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case '&':
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q[0] = '&';
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q[1] = 'a';
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q[2] = 'm';
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q[3] = 'p';
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q[4] = ';';
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q += 5;
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break;
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case '<':
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q[0] = '&';
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q[1] = 'l';
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q[2] = 't';
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q[3] = ';';
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q += 4;
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break;
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case '>':
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q[0] = '&';
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q[1] = 'g';
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q[2] = 't';
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q[3] = ';';
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q += 4;
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break;
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case '"':
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q[0] = '&';
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q[1] = 'q';
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q[2] = 'u';
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q[3] = 'o';
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q[4] = 't';
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q[5] = ';';
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q += 6;
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break;
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case '\'':
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q[0] = '&';
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q[1] = '#';
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q[2] = '3';
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q[3] = '9';
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q[4] = ';';
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q += 5;
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break;
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default:
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*q++ = c;
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break;
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}
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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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}
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