disable pwm7

hc

2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a

 kernel/lib/string_helpers.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * Helpers for formatting and printing strings
3
4
  *
..
..
@@ -230,24 +231,7 @@
230
231
  * @src:	source buffer (escaped)
231
232
  * @dst:	destination buffer (unescaped)
232
233
  * @size:	size of the destination buffer (0 to unlimit)
233
- * @flags:	combination of the flags (bitwise OR):
234
- *	%UNESCAPE_SPACE:
235
- *		'\f' - form feed
236
- *		'\n' - new line
237
- *		'\r' - carriage return
238
- *		'\t' - horizontal tab
239
- *		'\v' - vertical tab
240
- *	%UNESCAPE_OCTAL:
241
- *		'\NNN' - byte with octal value NNN (1 to 3 digits)
242
- *	%UNESCAPE_HEX:
243
- *		'\xHH' - byte with hexadecimal value HH (1 to 2 digits)
244
- *	%UNESCAPE_SPECIAL:
245
- *		'\"' - double quote
246
- *		'\\' - backslash
247
- *		'\a' - alert (BEL)
248
- *		'\e' - escape
249
- *	%UNESCAPE_ANY:
250
- *		all previous together
234
+ * @flags:	combination of the flags.
251
235
  *
252
236
  * Description:
253
237
  * The function unquotes characters in the given string.
..
..
@@ -257,7 +241,25 @@
257
241
  *
258
242
  * Caller must provide valid source and destination pointers. Be aware that
259
243
  * destination buffer will always be NULL-terminated. Source string must be
260
- * NULL-terminated as well.
244
+ * NULL-terminated as well.  The supported flags are::
245
+ *
246
+ *	UNESCAPE_SPACE:
247
+ *		'\f' - form feed
248
+ *		'\n' - new line
249
+ *		'\r' - carriage return
250
+ *		'\t' - horizontal tab
251
+ *		'\v' - vertical tab
252
+ *	UNESCAPE_OCTAL:
253
+ *		'\NNN' - byte with octal value NNN (1 to 3 digits)
254
+ *	UNESCAPE_HEX:
255
+ *		'\xHH' - byte with hexadecimal value HH (1 to 2 digits)
256
+ *	UNESCAPE_SPECIAL:
257
+ *		'\"' - double quote
258
+ *		'\\' - backslash
259
+ *		'\a' - alert (BEL)
260
+ *		'\e' - escape
261
+ *	UNESCAPE_ANY:
262
+ *		all previous together
261
263
  *
262
264
  * Return:
263
265
  * The amount of the characters processed to the destination buffer excluding
..
..
@@ -440,7 +442,29 @@
440
442
  * @isz:	source buffer size
441
443
  * @dst:	destination buffer (escaped)
442
444
  * @osz:	destination buffer size
443
- * @flags:	combination of the flags (bitwise OR):
445
+ * @flags:	combination of the flags
446
+ * @only:	NULL-terminated string containing characters used to limit
447
+ *		the selected escape class. If characters are included in @only
448
+ *		that would not normally be escaped by the classes selected
449
+ *		in @flags, they will be copied to @dst unescaped.
450
+ *
451
+ * Description:
452
+ * The process of escaping byte buffer includes several parts. They are applied
453
+ * in the following sequence.
454
+ *
455
+ *	1. The character is matched to the printable class, if asked, and in
456
+ *	   case of match it passes through to the output.
457
+ *	2. The character is not matched to the one from @only string and thus
458
+ *	   must go as-is to the output.
459
+ *	3. The character is checked if it falls into the class given by @flags.
460
+ *	   %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
461
+ *	   character. Note that they actually can't go together, otherwise
462
+ *	   %ESCAPE_HEX will be ignored.
463
+ *
464
+ * Caller must provide valid source and destination pointers. Be aware that
465
+ * destination buffer will not be NULL-terminated, thus caller have to append
466
+ * it if needs.   The supported flags are::
467
+ *
444
468
  *	%ESCAPE_SPACE: (special white space, not space itself)
445
469
  *		'\f' - form feed
446
470
  *		'\n' - new line
..
..
@@ -463,26 +487,6 @@
463
487
  *		all previous together
464
488
  *	%ESCAPE_HEX:
465
489
  *		'\xHH' - byte with hexadecimal value HH (2 digits)
466
- * @only:	NULL-terminated string containing characters used to limit
467
- *		the selected escape class. If characters are included in @only
468
- *		that would not normally be escaped by the classes selected
469
- *		in @flags, they will be copied to @dst unescaped.
470
- *
471
- * Description:
472
- * The process of escaping byte buffer includes several parts. They are applied
473
- * in the following sequence.
474
- *	1. The character is matched to the printable class, if asked, and in
475
- *	   case of match it passes through to the output.
476
- *	2. The character is not matched to the one from @only string and thus
477
- *	   must go as-is to the output.
478
- *	3. The character is checked if it falls into the class given by @flags.
479
- *	   %ESCAPE_OCTAL and %ESCAPE_HEX are going last since they cover any
480
- *	   character. Note that they actually can't go together, otherwise
481
- *	   %ESCAPE_HEX will be ignored.
482
- *
483
- * Caller must provide valid source and destination pointers. Be aware that
484
- * destination buffer will not be NULL-terminated, thus caller have to append
485
- * it if needs.
486
490
  *
487
491
  * Return:
488
492
  * The total size of the escaped output that would be generated for
..
..
@@ -538,6 +542,25 @@
538
542
 	return p - dst;
539
543
 }
540
544
 EXPORT_SYMBOL(string_escape_mem);
545
+
546
+int string_escape_mem_ascii(const char *src, size_t isz, char *dst,
547
+					size_t osz)
548
+{
549
+	char *p = dst;
550
+	char *end = p + osz;
551
+
552
+	while (isz--) {
553
+		unsigned char c = *src++;
554
+
555
+		if (!isprint(c) || !isascii(c) || c == '"' || c == '\\')
556
+			escape_hex(c, &p, end);
557
+		else
558
+			escape_passthrough(c, &p, end);
559
+	}
560
+
561
+	return p - dst;
562
+}
563
+EXPORT_SYMBOL(string_escape_mem_ascii);
541
564
 
542
565
 /*
543
566
  * Return an allocated string that has been escaped of special characters
..
..
@@ -626,3 +649,26 @@
626
649
 	return pathname;
627
650
 }
628
651
 EXPORT_SYMBOL_GPL(kstrdup_quotable_file);
652
+
653
+/**
654
+ * kfree_strarray - free a number of dynamically allocated strings contained
655
+ *                  in an array and the array itself
656
+ *
657
+ * @array: Dynamically allocated array of strings to free.
658
+ * @n: Number of strings (starting from the beginning of the array) to free.
659
+ *
660
+ * Passing a non-NULL @array and @n == 0 as well as NULL @array are valid
661
+ * use-cases. If @array is NULL, the function does nothing.
662
+ */
663
+void kfree_strarray(char **array, size_t n)
664
+{
665
+	unsigned int i;
666
+
667
+	if (!array)
668
+		return;
669
+
670
+	for (i = 0; i < n; i++)
671
+		kfree(array[i]);
672
+	kfree(array);
673
+}
674
+EXPORT_SYMBOL_GPL(kfree_strarray);