From 04dd17822334871b23ea2862f7798fb0e0007777 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Sat, 11 May 2024 08:53:19 +0000
Subject: [PATCH] change otg to host mode
---
kernel/lib/string_helpers.c | 126 ++++++++++++++++++++++++++++-------------
1 files changed, 86 insertions(+), 40 deletions(-)
diff --git a/kernel/lib/string_helpers.c b/kernel/lib/string_helpers.c
index 29c490e..7f2d5fb 100644
--- a/kernel/lib/string_helpers.c
+++ b/kernel/lib/string_helpers.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Helpers for formatting and printing strings
*
@@ -230,24 +231,7 @@
* @src: source buffer (escaped)
* @dst: destination buffer (unescaped)
* @size: size of the destination buffer (0 to unlimit)
- * @flags: combination of the flags (bitwise OR):
- * %UNESCAPE_SPACE:
- * '\f' - form feed
- * '\n' - new line
- * '\r' - carriage return
- * '\t' - horizontal tab
- * '\v' - vertical tab
- * %UNESCAPE_OCTAL:
- * '\NNN' - byte with octal value NNN (1 to 3 digits)
- * %UNESCAPE_HEX:
- * '\xHH' - byte with hexadecimal value HH (1 to 2 digits)
- * %UNESCAPE_SPECIAL:
- * '\"' - double quote
- * '\\' - backslash
- * '\a' - alert (BEL)
- * '\e' - escape
- * %UNESCAPE_ANY:
- * all previous together
+ * @flags: combination of the flags.
*
* Description:
* The function unquotes characters in the given string.
@@ -257,7 +241,25 @@
*
* Caller must provide valid source and destination pointers. Be aware that
* destination buffer will always be NULL-terminated. Source string must be
- * NULL-terminated as well.
+ * NULL-terminated as well. The supported flags are::
+ *
+ * UNESCAPE_SPACE:
+ * '\f' - form feed
+ * '\n' - new line
+ * '\r' - carriage return
+ * '\t' - horizontal tab
+ * '\v' - vertical tab
+ * UNESCAPE_OCTAL:
+ * '\NNN' - byte with octal value NNN (1 to 3 digits)
+ * UNESCAPE_HEX:
+ * '\xHH' - byte with hexadecimal value HH (1 to 2 digits)
+ * UNESCAPE_SPECIAL:
+ * '\"' - double quote
+ * '\\' - backslash
+ * '\a' - alert (BEL)
+ * '\e' - escape
+ * UNESCAPE_ANY:
+ * all previous together
*
* Return:
* The amount of the characters processed to the destination buffer excluding
@@ -440,7 +442,29 @@
* @isz: source buffer size
* @dst: destination buffer (escaped)
* @osz: destination buffer size
- * @flags: combination of the flags (bitwise OR):
+ * @flags: combination of the flags
+ * @only: NULL-terminated string containing characters used to limit
+ * the selected escape class. If characters are included in @only
+ * that would not normally be escaped by the classes selected
+ * in @flags, they will be copied to @dst unescaped.
+ *
+ * Description:
+ * The process of escaping byte buffer includes several parts. They are applied
+ * in the following sequence.
+ *
+ * 1. The character is matched to the printable class, if asked, and in
+ * case of match it passes through to the output.
+ * 2. The character is not matched to the one from @only string and thus
+ * must go as-is to the output.
+ * 3. The character is checked if it falls into the class given by @flags.
+ * %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
+ * character. Note that they actually can't go together, otherwise
+ * %ESCAPE_HEX will be ignored.
+ *
+ * Caller must provide valid source and destination pointers. Be aware that
+ * destination buffer will not be NULL-terminated, thus caller have to append
+ * it if needs. The supported flags are::
+ *
* %ESCAPE_SPACE: (special white space, not space itself)
* '\f' - form feed
* '\n' - new line
@@ -463,26 +487,6 @@
* all previous together
* %ESCAPE_HEX:
* '\xHH' - byte with hexadecimal value HH (2 digits)
- * @only: NULL-terminated string containing characters used to limit
- * the selected escape class. If characters are included in @only
- * that would not normally be escaped by the classes selected
- * in @flags, they will be copied to @dst unescaped.
- *
- * Description:
- * The process of escaping byte buffer includes several parts. They are applied
- * in the following sequence.
- * 1. The character is matched to the printable class, if asked, and in
- * case of match it passes through to the output.
- * 2. The character is not matched to the one from @only string and thus
- * must go as-is to the output.
- * 3. The character is checked if it falls into the class given by @flags.
- * %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
- * character. Note that they actually can't go together, otherwise
- * %ESCAPE_HEX will be ignored.
- *
- * Caller must provide valid source and destination pointers. Be aware that
- * destination buffer will not be NULL-terminated, thus caller have to append
- * it if needs.
*
* Return:
* The total size of the escaped output that would be generated for
@@ -538,6 +542,25 @@
return p - dst;
}
EXPORT_SYMBOL(string_escape_mem);
+
+int string_escape_mem_ascii(const char *src, size_t isz, char *dst,
+ size_t osz)
+{
+ char *p = dst;
+ char *end = p + osz;
+
+ while (isz--) {
+ unsigned char c = *src++;
+
+ if (!isprint(c) || !isascii(c) || c == '"' || c == '\\')
+ escape_hex(c, &p, end);
+ else
+ escape_passthrough(c, &p, end);
+ }
+
+ return p - dst;
+}
+EXPORT_SYMBOL(string_escape_mem_ascii);
/*
* Return an allocated string that has been escaped of special characters
@@ -626,3 +649,26 @@
return pathname;
}
EXPORT_SYMBOL_GPL(kstrdup_quotable_file);
+
+/**
+ * kfree_strarray - free a number of dynamically allocated strings contained
+ * in an array and the array itself
+ *
+ * @array: Dynamically allocated array of strings to free.
+ * @n: Number of strings (starting from the beginning of the array) to free.
+ *
+ * Passing a non-NULL @array and @n == 0 as well as NULL @array are valid
+ * use-cases. If @array is NULL, the function does nothing.
+ */
+void kfree_strarray(char **array, size_t n)
+{
+ unsigned int i;
+
+ if (!array)
+ return;
+
+ for (i = 0; i < n; i++)
+ kfree(array[i]);
+ kfree(array);
+}
+EXPORT_SYMBOL_GPL(kfree_strarray);
--
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