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Add function for creating hex string literals

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This commit is contained in:
Justine Tunney 2021-08-07 07:05:19 -07:00
parent aeeb851422
commit 1f766a332f
14 changed files with 250 additions and 112 deletions
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52
libc/stdio/dumphexc.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2021 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.internal.h"
#include "libc/stdio/append.internal.h"
#include "libc/stdio/hex.internal.h"
#include "libc/str/str.h"
/**
* Turns data into "\x00..." string literal.
*/
char *DumpHexc(const char *p, size_t n, size_t *z) {
long o;
int i, m;
char A[128], *q, *s = 0;
if (n == -1) n = p ? strlen(p) : 0;
appendw(&s, '"' | '\\' << 8 | '\n' << 16);
for (o = 0; (m = MIN(16, n)); p += m, n -= m) {
q = A;
for (i = 0; i < m; ++i) {
*q++ = '\\';
*q++ = 'x';
*q++ = "0123456789abcdef"[(p[i] & 0xF0) >> 4];
*q++ = "0123456789abcdef"[(p[i] & 0x0F) >> 0];
}
if (o) appendw(&s, '\\' | '\n' << 8);
appendd(&s, A, q - A);
o += m;
}
if (appendw(&s, '"') != -1) {
if (z) *z = appendz(s).i;
return s;
} else {
free(s);
return 0;
}
}