1 // SPDX-License-Identifier: GPL-2.0
11  * found in <asm-xx/string.h>), or get overloaded by FORTIFY_SOURCE.
31 #include <asm/word-at-a-time.h>
35  * strncasecmp - Case insensitive, length-limited string comparison
38  * @len: the maximum number of characters to compare
59 	} while (--len);  in strncasecmp()
60 	return (int)c1 - (int)c2;  in strncasecmp()
74 	return c1 - c2;  in strcasecmp()
100 		count--;  in strncpy()
120 		return -E2BIG;  in sized_strscpy()
128 	if ((long)src & (sizeof(long) - 1)) {  in sized_strscpy()
129 		size_t limit = PAGE_SIZE - ((long)src & (PAGE_SIZE - 1));  in sized_strscpy()
134 	/* If src or dest is unaligned, don't do word-at-a-time. */  in sized_strscpy()
135 	if (((long) dest | (long) src) & (sizeof(long) - 1))  in sized_strscpy()
163 		count -= sizeof(unsigned long);  in sized_strscpy()
167 			return -E2BIG;  in sized_strscpy()
171 		max -= sizeof(unsigned long);  in sized_strscpy()
182 		count--;  in sized_strscpy()
185 	/* Force NUL-termination. */  in sized_strscpy()
189 	return src[res] ? -E2BIG : res;  in sized_strscpy()
194  * stpcpy - copy a string from src to dest returning a pointer to the new end
195  *          of dest, including src's %NUL-terminator. May overrun dest.
202  * to the new %NUL-terminating character in @dest. (For strcpy, the return
213 	return --dest;  in stpcpy()
240 			if (--count == 0) {  in strncat()
262 	count -= dsize;  in strlcat()
264 		len = count-1;  in strlcat()
274  * strcmp - Compare two strings
275  * @cs: One string
278 int strcmp(const char *cs, const char *ct)  in strcmp()  argument
283 		c1 = *cs++;  in strcmp()
286 			return c1 < c2 ? -1 : 1;  in strcmp()
297  * strncmp - Compare two length-limited strings
298  * @cs: One string
300  * @count: The maximum number of bytes to compare
302 int strncmp(const char *cs, const char *ct, size_t count)  in strncmp()  argument
307 		c1 = *cs++;  in strncmp()
310 			return c1 < c2 ? -1 : 1;  in strncmp()
313 		count--;  in strncmp()
322  * strchr - Find the first occurrence of a character in a string
326  * Note that the %NUL-terminator is considered part of the string, and can
341  * strchrnul - Find and return a character in a string, or end of string
358  * strnchrnul - Find and return a character in a length limited string,
361  * @count: The number of characters to be searched
369 	while (count-- && *s && *s != (char)c)  in strnchrnul()
376  * strrchr - Find the last occurrence of a character in a string
394  * strnchr - Find a character in a length limited string
396  * @count: The number of characters to be searched
399  * Note that the %NUL-terminator is considered part of the string, and can
404 	while (count--) {  in strnchr()
422 	return sc - s;  in strlen()
432 	for (sc = s; count-- && *sc != '\0'; ++sc)  in strnlen()
434 	return sc - s;  in strnlen()
441 …* strspn - Calculate the length of the initial substring of @s which only contain letters in @acce…
453 	return p - s;  in strspn()
460 …* strcspn - Calculate the length of the initial substring of @s which does not contain letters in …
472 	return p - s;  in strcspn()
479  * strpbrk - Find the first occurrence of a set of characters
480  * @cs: The string to be searched
483 char *strpbrk(const char *cs, const char *ct)  in strpbrk()  argument
487 	for (sc = cs; *sc != '\0'; ++sc) {  in strpbrk()
498  * strsep - Split a string into tokens
505  * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
527  * memset - Fill a region of memory with the given value
538 	while (count--)  in memset()
547  * memset16() - Fill a memory area with a uint16_t
550  * @count: The number of values to store
553  * of a byte.  Remember that @count is the number of uint16_ts to
554  * store, not the number of bytes.
560 	while (count--)  in memset16()
569  * memset32() - Fill a memory area with a uint32_t
572  * @count: The number of values to store
575  * of a byte.  Remember that @count is the number of uint32_ts to
576  * store, not the number of bytes.
582 	while (count--)  in memset32()
591  * memset64() - Fill a memory area with a uint64_t
594  * @count: The number of values to store
597  * of a byte.  Remember that @count is the number of uint64_ts to
598  * store, not the number of bytes.
604 	while (count--)  in memset64()
613  * memcpy - Copy one area of memory to another
626 	while (count--)  in memcpy()
635  * memmove - Copy one area of memory to another
650 		while (count--)  in memmove()
657 		while (count--)  in memmove()
658 			*--tmp = *--s;  in memmove()
667  * memcmp - Compare two areas of memory
668  * @cs: One area of memory
673 __visible int memcmp(const void *cs, const void *ct, size_t count)  in memcmp()  argument
680 		const unsigned long *u1 = cs;  in memcmp()
687 			count -= sizeof(unsigned long);  in memcmp()
689 		cs = u1;  in memcmp()
693 	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)  in memcmp()
694 		if ((res = *su1 - *su2) != 0)  in memcmp()
703  * bcmp - returns 0 if and only if the buffers have identical contents.
708  * The sign or magnitude of a non-zero return value has no particular
711  * not rely on anything but whether the return value is zero or non-zero.
722  * memscan - Find a character in an area of memory.
738 		size--;  in memscan()
747  * strstr - Find the first substring in a %NUL terminated string
760 		l1--;  in strstr()
772  * strnstr - Find the first substring in a length-limited string
775  * @len: the maximum number of characters to search
785 		len--;  in strnstr()
797  * memchr - Find a character in an area of memory.
808 	while (n-- != 0) {  in memchr()
810 			return (void *)(p - 1);  in memchr()
824 		bytes--;  in check_bytes8()
830  * memchr_inv - Find an unmatching character in an area of memory.
863 		prefix = 8 - prefix;  in memchr_inv()
868 		bytes -= prefix;  in memchr_inv()
877 		words--;  in memchr_inv()