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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205// 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