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glib-aux: add NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_DOUBLE_QUOTE flag to escape double quotes

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This is useful when printing a string for debugging. Then we can
printf("v=\"%s\"", utf8safe_escaped_text), which can be safely unescaped
with `echo -e`.

(cherry picked from commit c26a94e955)
This commit is contained in:
Thomas Haller 2023-05-10 08:37:06 +02:00 • committed by Fernando Fernandez Mancera
parent 2ddb4e5942
commit dd08f0e1b9
2 changed files with 19 additions and 10 deletions
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21
src/libnm-glib-aux/nm-shared-utils.c
View file

@ -2755,13 +2755,16 @@ nm_utils_buf_utf8safe_escape(gconstpointer buf,
if (g_utf8_validate(str, buflen, &p) && nul_terminated) {
/* note that g_utf8_validate() does not allow NUL character inside @str. Good.
* We can treat @str like a NUL terminated string. */
if (!NM_STRCHAR_ANY(str,
ch,
(ch == '\\'
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL)
&& nm_ascii_is_ctrl_or_del(ch))
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII)
&& nm_ascii_is_non_ascii(ch)))))
if (!NM_STRCHAR_ANY(
str,
ch,
(ch == '\\'
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL)
&& nm_ascii_is_ctrl_or_del(ch))
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII)
&& nm_ascii_is_non_ascii(ch))
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_DOUBLE_QUOTE)
&& ch == '"'))))
return str;
}
@ -2781,7 +2784,9 @@ nm_utils_buf_utf8safe_escape(gconstpointer buf,
else if ((NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_CTRL)
&& nm_ascii_is_ctrl_or_del(ch))
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII)
&& nm_ascii_is_non_ascii(ch)))
&& nm_ascii_is_non_ascii(ch))
|| (NM_FLAGS_HAS(flags, NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_DOUBLE_QUOTE)
&& ch == '"'))
_str_buf_append_c_escape_octal(&strbuf, ch);
else
nm_str_buf_append_c(&strbuf, ch);

8
src/libnm-glib-aux/nm-shared-utils.h
View file

@ -1251,12 +1251,16 @@ typedef enum {
* It will backslash escape ascii characters according to nm_ascii_is_non_ascii(). */
NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_NON_ASCII = 0x0002,
/* Escape '"' as ASCII "\\042". This is useful when escaping a string so that
* it can be unescaped with `echo -e $PASTE_TEXT`. */
NM_UTILS_STR_UTF8_SAFE_FLAG_ESCAPE_DOUBLE_QUOTE = 0x0004,
/* This flag only has an effect during escaping to ensure we
* don't leak secrets in memory. Note that during unescape we
* know the maximum result size from the beginning, and no
* reallocation happens. Thus, unescape always avoids leaking
* secrets already. */
NM_UTILS_STR_UTF8_SAFE_FLAG_SECRET = 0x0004,
NM_UTILS_STR_UTF8_SAFE_FLAG_SECRET = 0x0008,
/* This flag only has an effect during unescaping. It means
* that non-escaped whitespaces (g_ascii_isspace()) will be
@ -1264,7 +1268,7 @@ typedef enum {
* this flag is only useful for gracefully accepting user input
* with spaces. With this flag, escape and unescape may no longer
* yield the original input. */
NM_UTILS_STR_UTF8_SAFE_UNESCAPE_STRIP_SPACES = 0x0008,
NM_UTILS_STR_UTF8_SAFE_UNESCAPE_STRIP_SPACES = 0x0010,
} NMUtilsStrUtf8SafeFlags;
const char *nm_utils_buf_utf8safe_escape(gconstpointer buf,