119 lines
4.3 KiB
C
119 lines
4.3 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 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/str/str.h"
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static textwindows bool shouldescapedos(const char16_t c) {
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if (c == u'"') return true;
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if (c == u'&') return true;
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if (c == u'%') return true;
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if (c == u'^') return true;
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if (c == u'<') return true;
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if (c == u'>') return true;
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if (c == u'|') return true;
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return false;
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}
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static textwindows bool shouldquotedos(const char16_t c) {
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if (c == u' ') return true;
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if (c == u'\t') return true;
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if (c == u'\n') return true;
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if (c == u'\v') return true;
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if (c == u'"') return true;
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if (c == u'*') return true;
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return shouldescapedos(c);
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}
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/**
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* Escapes command so DOS can run it.
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* @see Iain Patterson's NSSM for original code in public domain
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*/
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textwindows bool escapedos(char16_t *buffer, unsigned buflen,
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const char16_t *unquoted, unsigned len) {
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unsigned i, j, n;
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if (len > buflen - 1) return false;
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bool escape = false;
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bool quotes = false;
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for (i = 0; i < len; i++) {
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if (shouldescapedos(unquoted[i])) {
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escape = quotes = true;
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break;
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}
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if (shouldquotedos(unquoted[i])) quotes = true;
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}
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if (!quotes) {
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memmove(buffer, unquoted, (len + 1) * sizeof(char16_t));
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return true;
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}
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/* "" */
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unsigned quoted_len = 2;
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if (escape) quoted_len += 2;
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for (i = 0;; i++) {
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n = 0;
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while (i != len && unquoted[i] == u'\\') {
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i++;
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n++;
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}
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if (i == len) {
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quoted_len += n * 2;
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break;
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} else if (unquoted[i] == u'"')
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quoted_len += n * 2 + 2;
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else
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quoted_len += n + 1;
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if (shouldescapedos(unquoted[i])) quoted_len += n;
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}
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if (quoted_len > buflen - 1) return false;
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char16_t *s = buffer;
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if (escape) *s++ = u'^';
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*s++ = u'"';
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for (i = 0;; i++) {
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n = 0;
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while (i != len && unquoted[i] == u'\\') {
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i++;
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n++;
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}
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if (i == len) {
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for (j = 0; j < n * 2; j++) {
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if (escape) *s++ = u'^';
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*s++ = u'\\';
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}
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break;
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} else if (unquoted[i] == u'"') {
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for (j = 0; j < n * 2 + 1; j++) {
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if (escape) *s++ = u'^';
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*s++ = u'\\';
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}
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if (escape && shouldescapedos(unquoted[i])) *s++ = u'^';
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*s++ = unquoted[i];
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} else {
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for (j = 0; j < n; j++) {
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if (escape) *s++ = u'^';
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*s++ = u'\\';
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}
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if (escape && shouldescapedos(unquoted[i])) *s++ = u'^';
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*s++ = unquoted[i];
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}
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}
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if (escape) *s++ = u'^';
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*s++ = u'"';
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*s++ = u'\0';
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return true;
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}
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