mirror of
https://github.com/jart/cosmopolitan.git
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55 lines
2.6 KiB
C
55 lines
2.6 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 2020 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/str/internal.h"
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unsigned cescapec(int c) {
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unsigned char ch = c;
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switch (ch) {
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case '\a':
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return '\\' | 'a' << 8;
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case '\b':
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return '\\' | 'b' << 8;
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case '\v':
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return '\\' | 'v' << 8;
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case '\f':
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return '\\' | 'f' << 8;
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case '\?':
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return '\\' | '?' << 8;
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case '\n':
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return '\\' | 'n' << 8;
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case '\r':
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return '\\' | 'r' << 8;
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case '\t':
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return '\\' | 't' << 8;
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case '\"':
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return '\\' | '"' << 8;
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case '\'':
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return '\\' | '\'' << 8;
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case '\\':
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return '\\' | '\\' << 8;
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default: {
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if (ch >= 0x80 || !isprint(ch)) {
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return '\\' | (ch / 64 + '0') << 8 | (ch % 64 / 8 + '0') << 16 |
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(ch % 8 + '0') << 24;
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} else {
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return ch;
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}
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}
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}
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}
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