// SPDX-License-Identifier: GPL-2.0/* * Taken from: *  linux/lib/string.c * *  Copyright (C) 1991, 1992  Linus Torvalds */ #include <linux/ctype.h>#include <linux/kernel.h>#include <linux/types.h>#include <linux/string.h> #ifndef EFI_HAVE_STRLEN/** * strlen - Find the length of a string * @s: The string to be sized */size_t strlen(const char *s){	const char *sc; 	for (sc = s; *sc != '\0'; ++sc)		/* nothing */;	return sc - s;}#endif #ifndef EFI_HAVE_STRNLEN/** * strnlen - Find the length of a length-limited string * @s: The string to be sized * @count: The maximum number of bytes to search */size_t strnlen(const char *s, size_t count){	const char *sc; 	for (sc = s; count-- && *sc != '\0'; ++sc)		/* nothing */;	return sc - s;}#endif /** * strstr - Find the first substring in a %NUL terminated string * @s1: The string to be searched * @s2: The string to search for */char *strstr(const char *s1, const char *s2){	size_t l1, l2; 	l2 = strlen(s2);	if (!l2)		return (char *)s1;	l1 = strlen(s1);	while (l1 >= l2) {		l1--;		if (!memcmp(s1, s2, l2))			return (char *)s1;		s1++;	}	return NULL;} #ifndef EFI_HAVE_STRCMP/** * strcmp - Compare two strings * @cs: One string * @ct: Another string */int strcmp(const char *cs, const char *ct){	unsigned char c1, c2; 	while (1) {		c1 = *cs++;		c2 = *ct++;		if (c1 != c2)			return c1 < c2 ? -1 : 1;		if (!c1)			break;	}	return 0;}#endif /** * strncmp - Compare two length-limited strings * @cs: One string * @ct: Another string * @count: The maximum number of bytes to compare */int strncmp(const char *cs, const char *ct, size_t count){	unsigned char c1, c2; 	while (count) {		c1 = *cs++;		c2 = *ct++;		if (c1 != c2)			return c1 < c2 ? -1 : 1;		if (!c1)			break;		count--;	}	return 0;} /* Works only for digits and letters, but small and fast */#define TOLOWER(x) ((x) | 0x20) static unsigned int simple_guess_base(const char *cp){	if (cp[0] == '0') {		if (TOLOWER(cp[1]) == 'x' && isxdigit(cp[2]))			return 16;		else			return 8;	} else {		return 10;	}} /** * simple_strtoull - convert a string to an unsigned long long * @cp: The start of the string * @endp: A pointer to the end of the parsed string will be placed here * @base: The number base to use */ unsigned long long simple_strtoull(const char *cp, char **endp, unsigned int base){	unsigned long long result = 0; 	if (!base)		base = simple_guess_base(cp); 	if (base == 16 && cp[0] == '0' && TOLOWER(cp[1]) == 'x')		cp += 2; 	while (isxdigit(*cp)) {		unsigned int value; 		value = isdigit(*cp) ? *cp - '0' : TOLOWER(*cp) - 'a' + 10;		if (value >= base)			break;		result = result * base + value;		cp++;	}	if (endp)		*endp = (char *)cp; 	return result;} long simple_strtol(const char *cp, char **endp, unsigned int base){	if (*cp == '-')		return -simple_strtoull(cp + 1, endp, base); 	return simple_strtoull(cp, endp, base);} #ifdef CONFIG_EFI_PARAMS_FROM_FDT#ifndef EFI_HAVE_STRRCHR/** * strrchr - Find the last occurrence of a character in a string * @s: The string to be searched * @c: The character to search for */char *strrchr(const char *s, int c){	const char *last = NULL;	do {		if (*s == (char)c)			last = s;	} while (*s++);	return (char *)last;}#endif#ifndef EFI_HAVE_MEMCHR/** * memchr - Find a character in an area of memory. * @s: The memory area * @c: The byte to search for * @n: The size of the area. * * returns the address of the first occurrence of @c, or %NULL * if @c is not found */void *memchr(const void *s, int c, size_t n){	const unsigned char *p = s;	while (n-- != 0) {		if ((unsigned char)c == *p++) {			return (void *)(p - 1);		}	}	return NULL;}#endif#endif