mirror of
https://github.com/jart/cosmopolitan.git
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52 lines
2.6 KiB
C
52 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 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/macros.internal.h"
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#include "libc/stdio/append.internal.h"
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#include "libc/stdio/hex.internal.h"
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#include "libc/str/str.h"
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/**
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* Turns data into "\x00..." string literal.
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*/
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char *DumpHexc(const char *p, size_t n, size_t *z) {
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long o;
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int i, m;
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char A[128], *q, *s = 0;
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if (n == -1) n = p ? strlen(p) : 0;
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appendw(&s, '"' | '\\' << 8 | '\n' << 16);
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for (o = 0; (m = MIN(16, n)); p += m, n -= m) {
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q = A;
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for (i = 0; i < m; ++i) {
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*q++ = '\\';
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*q++ = 'x';
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*q++ = "0123456789abcdef"[(p[i] & 0xF0) >> 4];
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*q++ = "0123456789abcdef"[(p[i] & 0x0F) >> 0];
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}
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if (o) appendw(&s, '\\' | '\n' << 8);
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appendd(&s, A, q - A);
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o += m;
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}
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if (appendw(&s, '"') != -1) {
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if (z) *z = appendz(s).i;
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return s;
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} else {
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free(s);
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return 0;
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}
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}
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