1 // SPDX-License-Identifier: GPL-2.0
11  * found in <asm-xx/string.h>), or get overloaded by FORTIFY_SOURCE.
29 #include <asm/word-at-a-time.h>
34  * strncasecmp - Case insensitive, length-limited string comparison
37  * @len: the maximum number of characters to compare
58 	} while (--len);  in strncasecmp()
59 	return (int)c1 - (int)c2;  in strncasecmp()
73 	return c1 - c2;  in strcasecmp()
99 		count--;  in strncpy()
114 		return -E2BIG;  in strscpy()
121 	if ((long)src & (sizeof(long) - 1)) {  in strscpy()
122 		size_t limit = PAGE_SIZE - ((long)src & (PAGE_SIZE - 1));  in strscpy()
127 	/* If src or dest is unaligned, don't do word-at-a-time. */  in strscpy()
128 	if (((long) dest | (long) src) & (sizeof(long) - 1))  in strscpy()
152 		count -= sizeof(unsigned long);  in strscpy()
153 		max -= sizeof(unsigned long);  in strscpy()
164 		count--;  in strscpy()
167 	/* Hit buffer length without finding a NUL; force NUL-termination. */  in strscpy()
169 		dest[res-1] = '\0';  in strscpy()
171 	return -E2BIG;  in strscpy()
177  * stpcpy - copy a string from src to dest returning a pointer to the new end
178  *          of dest, including src's %NUL-terminator. May overrun dest.
185  * to the new %NUL-terminating character in @dest. (For strcpy, the return
196 	return --dest;  in stpcpy()
223 			if (--count == 0) {  in strncat()
245 	count -= dsize;  in strlcat()
247 		len = count-1;  in strlcat()
257  * strcmp - Compare two strings
258  * @cs: One string
261 int strcmp(const char *cs, const char *ct)  in strcmp()  argument
266 		c1 = *cs++;  in strcmp()
269 			return c1 < c2 ? -1 : 1;  in strcmp()
280  * strncmp - Compare two length-limited strings
281  * @cs: One string
283  * @count: The maximum number of bytes to compare
285 int strncmp(const char *cs, const char *ct, size_t count)  in strncmp()  argument
290 		c1 = *cs++;  in strncmp()
293 			return c1 < c2 ? -1 : 1;  in strncmp()
296 		count--;  in strncmp()
305  * strchr - Find the first occurrence of a character in a string
309  * Note that the %NUL-terminator is considered part of the string, and can
324  * strchrnul - Find and return a character in a string, or end of string
341  * strnchrnul - Find and return a character in a length limited string,
344  * @count: The number of characters to be searched
352 	while (count-- && *s && *s != (char)c)  in strnchrnul()
359  * strrchr - Find the last occurrence of a character in a string
377  * strnchr - Find a character in a length limited string
379  * @count: The number of characters to be searched
382  * Note that the %NUL-terminator is considered part of the string, and can
387 	while (count--) {  in strnchr()
405 	return sc - s;  in strlen()
415 	for (sc = s; count-- && *sc != '\0'; ++sc)  in strnlen()
417 	return sc - s;  in strnlen()
424 …* strspn - Calculate the length of the initial substring of @s which only contain letters in @acce…
436 	return p - s;  in strspn()
443 …* strcspn - Calculate the length of the initial substring of @s which does not contain letters in …
455 	return p - s;  in strcspn()
462  * strpbrk - Find the first occurrence of a set of characters
463  * @cs: The string to be searched
466 char *strpbrk(const char *cs, const char *ct)  in strpbrk()  argument
470 	for (sc = cs; *sc != '\0'; ++sc) {  in strpbrk()
481  * strsep - Split a string into tokens
488  * of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
510  * memset - Fill a region of memory with the given value
521 	while (count--)  in memset()
530  * memset16() - Fill a memory area with a uint16_t
533  * @count: The number of values to store
536  * of a byte.  Remember that @count is the number of uint16_ts to
537  * store, not the number of bytes.
543 	while (count--)  in memset16()
552  * memset32() - Fill a memory area with a uint32_t
555  * @count: The number of values to store
558  * of a byte.  Remember that @count is the number of uint32_ts to
559  * store, not the number of bytes.
565 	while (count--)  in memset32()
574  * memset64() - Fill a memory area with a uint64_t
577  * @count: The number of values to store
580  * of a byte.  Remember that @count is the number of uint64_ts to
581  * store, not the number of bytes.
587 	while (count--)  in memset64()
596  * memcpy - Copy one area of memory to another
609 	while (count--)  in memcpy()
618  * memmove - Copy one area of memory to another
633 		while (count--)  in memmove()
640 		while (count--)  in memmove()
641 			*--tmp = *--s;  in memmove()
650  * memcmp - Compare two areas of memory
651  * @cs: One area of memory
656 __visible int memcmp(const void *cs, const void *ct, size_t count)  in memcmp()  argument
663 		const unsigned long *u1 = cs;  in memcmp()
670 			count -= sizeof(unsigned long);  in memcmp()
672 		cs = u1;  in memcmp()
676 	for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)  in memcmp()
677 		if ((res = *su1 - *su2) != 0)  in memcmp()
686  * bcmp - returns 0 if and only if the buffers have identical contents.
691  * The sign or magnitude of a non-zero return value has no particular
694  * not rely on anything but whether the return value is zero or non-zero.
705  * memscan - Find a character in an area of memory.
721 		size--;  in memscan()
730  * strstr - Find the first substring in a %NUL terminated string
743 		l1--;  in strstr()
755  * strnstr - Find the first substring in a length-limited string
758  * @len: the maximum number of characters to search
768 		len--;  in strnstr()
780  * memchr - Find a character in an area of memory.
791 	while (n-- != 0) {  in memchr()
793 			return (void *)(p - 1);  in memchr()
807 		bytes--;  in check_bytes8()
813  * memchr_inv - Find an unmatching character in an area of memory.
846 		prefix = 8 - prefix;  in memchr_inv()
851 		bytes -= prefix;  in memchr_inv()
860 		words--;  in memchr_inv()