74 lines
3.6 KiB
C
74 lines
3.6 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/safemacros.h"
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#include "libc/dce.h"
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#include "libc/escape/escape.h"
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#include "libc/limits.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/errfuns.h"
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#define SHQUOTE_PUTCHAR(c) \
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do { \
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if (buf != NULL && j < size - 1) { \
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buf[j] = (c); \
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} \
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j++; \
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} while (0)
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/**
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* Quotes memory for inclusion in single-quoted SystemV string literals.
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*
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* The outer quotation marks are *not* added.
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*
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* @param buf is the output area, which can't overlap and, no matter
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* what, a NUL-terminator will always be placed in the buffer at
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* an appropriate place, provided buf!=NULL && size!=0
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* @param size is the byte-length of the output area
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* @param s is the data, which may have NUL characters
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* @param l is the byte-length of s
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* @return number of characters written, excluding NUL terminator; or,
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* if the output buffer wasn't passed, or was too short, then the
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* number of characters that *would* have been written is returned;
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* since that's how the snprintf() API works; and never < 0
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* @see xaescapesh() for an easier api
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*/
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int escapesh(char *buf, unsigned size, const char *s, unsigned l) {
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assert(size <= INT_MAX && l <= INT_MAX);
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if (!IsTrustworthy() && l >= INT_MAX) abort();
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unsigned j = 0;
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for (unsigned i = 0; i < l; ++i) {
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if (s[i] != '\'') {
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SHQUOTE_PUTCHAR(s[i]);
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} else {
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const char *const s2 = "'\"'\"'";
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unsigned l2 = 5;
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for (unsigned k = 0; k < l2; ++k) {
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SHQUOTE_PUTCHAR(s2[k]);
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}
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}
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}
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if (buf && size) {
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buf[min(j, size - 1)] = '\0';
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}
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return j;
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}
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