150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301 USA.
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*
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* Copyright 2019 Red Hat, Inc.
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*/
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#include "nm-default.h"
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#include "nm-json-aux.h"
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/*****************************************************************************/
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static void
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_gstr_append_string_len (GString *gstr,
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const char *str,
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gsize len)
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{
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g_string_append_c (gstr, '\"');
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while (len > 0) {
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gsize n;
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const char *end;
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gboolean valid;
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nm_assert (len > 0);
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valid = g_utf8_validate (str, len, &end);
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nm_assert ( end
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&& end >= str
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&& end <= &str[len]);
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if (end > str) {
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const char *s;
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for (s = str; s < end; s++) {
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nm_assert (s[0] != '\0');
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if (s[0] < 0x20) {
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const char *text;
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switch (s[0]) {
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case '\\': text = "\\\\"; break;
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case '\"': text = "\\\""; break;
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case '\b': text = "\\b"; break;
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case '\f': text = "\\f"; break;
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case '\n': text = "\\n"; break;
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case '\r': text = "\\r"; break;
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case '\t': text = "\\t"; break;
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default:
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g_string_append_printf (gstr, "\\u%04X", (guint) s[0]);
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continue;
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}
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g_string_append (gstr, text);
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continue;
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}
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if (NM_IN_SET (s[0], '\\', '\"'))
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g_string_append_c (gstr, '\\');
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g_string_append_c (gstr, s[0]);
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}
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} else
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nm_assert (!valid);
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if (valid) {
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nm_assert (end == &str[len]);
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break;
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}
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nm_assert (end < &str[len]);
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if (end[0] == '\0') {
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/* there is a NUL byte in the string. Technically this is valid UTF-8, so we
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* encode it there. However, this will likely result in a truncated string when
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* parsing. */
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g_string_append (gstr, "\\u0000");
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} else {
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/* the character is not valid UTF-8. There is nothing we can do about it, because
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* JSON can only contain UTF-8 and even the escape sequences can only escape Unicode
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* codepoints (but not binary).
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*
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* The argument is not a a string (in any known encoding), hence we cannot represent
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* it as a JSON string (which are unicode strings).
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*
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* Print an underscore instead of the invalid char :) */
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g_string_append_c (gstr, '_');
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}
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n = str - end;
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nm_assert (n < len);
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n++;
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str += n;
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len -= n;
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}
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g_string_append_c (gstr, '\"');
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}
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void
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nm_json_aux_gstr_append_string_len (GString *gstr,
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const char *str,
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gsize n)
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{
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g_return_if_fail (gstr);
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_gstr_append_string_len (gstr, str, n);
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}
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void
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nm_json_aux_gstr_append_string (GString *gstr,
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const char *str)
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{
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g_return_if_fail (gstr);
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if (!str)
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g_string_append (gstr, "null");
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else
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_gstr_append_string_len (gstr, str, strlen (str));
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}
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void
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nm_json_aux_gstr_append_obj_name (GString *gstr,
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const char *key,
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char start_container)
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{
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g_return_if_fail (gstr);
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g_return_if_fail (key);
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nm_json_aux_gstr_append_string (gstr, key);
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if (start_container != '\0') {
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nm_assert (NM_IN_SET (start_container, '[', '{'));
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g_string_append_printf (gstr, ": %c ", start_container);
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} else
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g_string_append (gstr, ": ");
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}
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