mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 03:16:39 +07:00
34990cf702
Add a new sysfs_streq() string comparison function, which ignores the trailing newlines found in sysfs inputs. By example: sysfs_streq("a", "b") ==> false sysfs_streq("a", "a") ==> true sysfs_streq("a", "a\n") ==> true sysfs_streq("a\n", "a") ==> true This is intended to simplify parsing of sysfs inputs, letting them avoid the need to manually strip off newlines from inputs. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
690 lines
14 KiB
C
690 lines
14 KiB
C
/*
|
|
* linux/lib/string.c
|
|
*
|
|
* Copyright (C) 1991, 1992 Linus Torvalds
|
|
*/
|
|
|
|
/*
|
|
* stupid library routines.. The optimized versions should generally be found
|
|
* as inline code in <asm-xx/string.h>
|
|
*
|
|
* These are buggy as well..
|
|
*
|
|
* * Fri Jun 25 1999, Ingo Oeser <ioe@informatik.tu-chemnitz.de>
|
|
* - Added strsep() which will replace strtok() soon (because strsep() is
|
|
* reentrant and should be faster). Use only strsep() in new code, please.
|
|
*
|
|
* * Sat Feb 09 2002, Jason Thomas <jason@topic.com.au>,
|
|
* Matthew Hawkins <matt@mh.dropbear.id.au>
|
|
* - Kissed strtok() goodbye
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/module.h>
|
|
|
|
#ifndef __HAVE_ARCH_STRNICMP
|
|
/**
|
|
* strnicmp - Case insensitive, length-limited string comparison
|
|
* @s1: One string
|
|
* @s2: The other string
|
|
* @len: the maximum number of characters to compare
|
|
*/
|
|
int strnicmp(const char *s1, const char *s2, size_t len)
|
|
{
|
|
/* Yes, Virginia, it had better be unsigned */
|
|
unsigned char c1, c2;
|
|
|
|
c1 = c2 = 0;
|
|
if (len) {
|
|
do {
|
|
c1 = *s1;
|
|
c2 = *s2;
|
|
s1++;
|
|
s2++;
|
|
if (!c1)
|
|
break;
|
|
if (!c2)
|
|
break;
|
|
if (c1 == c2)
|
|
continue;
|
|
c1 = tolower(c1);
|
|
c2 = tolower(c2);
|
|
if (c1 != c2)
|
|
break;
|
|
} while (--len);
|
|
}
|
|
return (int)c1 - (int)c2;
|
|
}
|
|
EXPORT_SYMBOL(strnicmp);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRCASECMP
|
|
int strcasecmp(const char *s1, const char *s2)
|
|
{
|
|
int c1, c2;
|
|
|
|
do {
|
|
c1 = tolower(*s1++);
|
|
c2 = tolower(*s2++);
|
|
} while (c1 == c2 && c1 != 0);
|
|
return c1 - c2;
|
|
}
|
|
EXPORT_SYMBOL(strcasecmp);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRNCASECMP
|
|
int strncasecmp(const char *s1, const char *s2, size_t n)
|
|
{
|
|
int c1, c2;
|
|
|
|
do {
|
|
c1 = tolower(*s1++);
|
|
c2 = tolower(*s2++);
|
|
} while ((--n > 0) && c1 == c2 && c1 != 0);
|
|
return c1 - c2;
|
|
}
|
|
EXPORT_SYMBOL(strncasecmp);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRCPY
|
|
/**
|
|
* strcpy - Copy a %NUL terminated string
|
|
* @dest: Where to copy the string to
|
|
* @src: Where to copy the string from
|
|
*/
|
|
#undef strcpy
|
|
char *strcpy(char *dest, const char *src)
|
|
{
|
|
char *tmp = dest;
|
|
|
|
while ((*dest++ = *src++) != '\0')
|
|
/* nothing */;
|
|
return tmp;
|
|
}
|
|
EXPORT_SYMBOL(strcpy);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRNCPY
|
|
/**
|
|
* strncpy - Copy a length-limited, %NUL-terminated string
|
|
* @dest: Where to copy the string to
|
|
* @src: Where to copy the string from
|
|
* @count: The maximum number of bytes to copy
|
|
*
|
|
* The result is not %NUL-terminated if the source exceeds
|
|
* @count bytes.
|
|
*
|
|
* In the case where the length of @src is less than that of
|
|
* count, the remainder of @dest will be padded with %NUL.
|
|
*
|
|
*/
|
|
char *strncpy(char *dest, const char *src, size_t count)
|
|
{
|
|
char *tmp = dest;
|
|
|
|
while (count) {
|
|
if ((*tmp = *src) != 0)
|
|
src++;
|
|
tmp++;
|
|
count--;
|
|
}
|
|
return dest;
|
|
}
|
|
EXPORT_SYMBOL(strncpy);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRLCPY
|
|
/**
|
|
* strlcpy - Copy a %NUL terminated string into a sized buffer
|
|
* @dest: Where to copy the string to
|
|
* @src: Where to copy the string from
|
|
* @size: size of destination buffer
|
|
*
|
|
* Compatible with *BSD: the result is always a valid
|
|
* NUL-terminated string that fits in the buffer (unless,
|
|
* of course, the buffer size is zero). It does not pad
|
|
* out the result like strncpy() does.
|
|
*/
|
|
size_t strlcpy(char *dest, const char *src, size_t size)
|
|
{
|
|
size_t ret = strlen(src);
|
|
|
|
if (size) {
|
|
size_t len = (ret >= size) ? size - 1 : ret;
|
|
memcpy(dest, src, len);
|
|
dest[len] = '\0';
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(strlcpy);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRCAT
|
|
/**
|
|
* strcat - Append one %NUL-terminated string to another
|
|
* @dest: The string to be appended to
|
|
* @src: The string to append to it
|
|
*/
|
|
#undef strcat
|
|
char *strcat(char *dest, const char *src)
|
|
{
|
|
char *tmp = dest;
|
|
|
|
while (*dest)
|
|
dest++;
|
|
while ((*dest++ = *src++) != '\0')
|
|
;
|
|
return tmp;
|
|
}
|
|
EXPORT_SYMBOL(strcat);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRNCAT
|
|
/**
|
|
* strncat - Append a length-limited, %NUL-terminated string to another
|
|
* @dest: The string to be appended to
|
|
* @src: The string to append to it
|
|
* @count: The maximum numbers of bytes to copy
|
|
*
|
|
* Note that in contrast to strncpy(), strncat() ensures the result is
|
|
* terminated.
|
|
*/
|
|
char *strncat(char *dest, const char *src, size_t count)
|
|
{
|
|
char *tmp = dest;
|
|
|
|
if (count) {
|
|
while (*dest)
|
|
dest++;
|
|
while ((*dest++ = *src++) != 0) {
|
|
if (--count == 0) {
|
|
*dest = '\0';
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return tmp;
|
|
}
|
|
EXPORT_SYMBOL(strncat);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRLCAT
|
|
/**
|
|
* strlcat - Append a length-limited, %NUL-terminated string to another
|
|
* @dest: The string to be appended to
|
|
* @src: The string to append to it
|
|
* @count: The size of the destination buffer.
|
|
*/
|
|
size_t strlcat(char *dest, const char *src, size_t count)
|
|
{
|
|
size_t dsize = strlen(dest);
|
|
size_t len = strlen(src);
|
|
size_t res = dsize + len;
|
|
|
|
/* This would be a bug */
|
|
BUG_ON(dsize >= count);
|
|
|
|
dest += dsize;
|
|
count -= dsize;
|
|
if (len >= count)
|
|
len = count-1;
|
|
memcpy(dest, src, len);
|
|
dest[len] = 0;
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(strlcat);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRCMP
|
|
/**
|
|
* strcmp - Compare two strings
|
|
* @cs: One string
|
|
* @ct: Another string
|
|
*/
|
|
#undef strcmp
|
|
int strcmp(const char *cs, const char *ct)
|
|
{
|
|
signed char __res;
|
|
|
|
while (1) {
|
|
if ((__res = *cs - *ct++) != 0 || !*cs++)
|
|
break;
|
|
}
|
|
return __res;
|
|
}
|
|
EXPORT_SYMBOL(strcmp);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRNCMP
|
|
/**
|
|
* 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)
|
|
{
|
|
signed char __res = 0;
|
|
|
|
while (count) {
|
|
if ((__res = *cs - *ct++) != 0 || !*cs++)
|
|
break;
|
|
count--;
|
|
}
|
|
return __res;
|
|
}
|
|
EXPORT_SYMBOL(strncmp);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRCHR
|
|
/**
|
|
* strchr - Find the first occurrence of a character in a string
|
|
* @s: The string to be searched
|
|
* @c: The character to search for
|
|
*/
|
|
char *strchr(const char *s, int c)
|
|
{
|
|
for (; *s != (char)c; ++s)
|
|
if (*s == '\0')
|
|
return NULL;
|
|
return (char *)s;
|
|
}
|
|
EXPORT_SYMBOL(strchr);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_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 *p = s + strlen(s);
|
|
do {
|
|
if (*p == (char)c)
|
|
return (char *)p;
|
|
} while (--p >= s);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(strrchr);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRNCHR
|
|
/**
|
|
* strnchr - Find a character in a length limited string
|
|
* @s: The string to be searched
|
|
* @count: The number of characters to be searched
|
|
* @c: The character to search for
|
|
*/
|
|
char *strnchr(const char *s, size_t count, int c)
|
|
{
|
|
for (; count-- && *s != '\0'; ++s)
|
|
if (*s == (char)c)
|
|
return (char *)s;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(strnchr);
|
|
#endif
|
|
|
|
/**
|
|
* strstrip - Removes leading and trailing whitespace from @s.
|
|
* @s: The string to be stripped.
|
|
*
|
|
* Note that the first trailing whitespace is replaced with a %NUL-terminator
|
|
* in the given string @s. Returns a pointer to the first non-whitespace
|
|
* character in @s.
|
|
*/
|
|
char *strstrip(char *s)
|
|
{
|
|
size_t size;
|
|
char *end;
|
|
|
|
size = strlen(s);
|
|
|
|
if (!size)
|
|
return s;
|
|
|
|
end = s + size - 1;
|
|
while (end >= s && isspace(*end))
|
|
end--;
|
|
*(end + 1) = '\0';
|
|
|
|
while (*s && isspace(*s))
|
|
s++;
|
|
|
|
return s;
|
|
}
|
|
EXPORT_SYMBOL(strstrip);
|
|
|
|
#ifndef __HAVE_ARCH_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;
|
|
}
|
|
EXPORT_SYMBOL(strlen);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_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;
|
|
}
|
|
EXPORT_SYMBOL(strnlen);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRSPN
|
|
/**
|
|
* strspn - Calculate the length of the initial substring of @s which only contain letters in @accept
|
|
* @s: The string to be searched
|
|
* @accept: The string to search for
|
|
*/
|
|
size_t strspn(const char *s, const char *accept)
|
|
{
|
|
const char *p;
|
|
const char *a;
|
|
size_t count = 0;
|
|
|
|
for (p = s; *p != '\0'; ++p) {
|
|
for (a = accept; *a != '\0'; ++a) {
|
|
if (*p == *a)
|
|
break;
|
|
}
|
|
if (*a == '\0')
|
|
return count;
|
|
++count;
|
|
}
|
|
return count;
|
|
}
|
|
|
|
EXPORT_SYMBOL(strspn);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRCSPN
|
|
/**
|
|
* strcspn - Calculate the length of the initial substring of @s which does not contain letters in @reject
|
|
* @s: The string to be searched
|
|
* @reject: The string to avoid
|
|
*/
|
|
size_t strcspn(const char *s, const char *reject)
|
|
{
|
|
const char *p;
|
|
const char *r;
|
|
size_t count = 0;
|
|
|
|
for (p = s; *p != '\0'; ++p) {
|
|
for (r = reject; *r != '\0'; ++r) {
|
|
if (*p == *r)
|
|
return count;
|
|
}
|
|
++count;
|
|
}
|
|
return count;
|
|
}
|
|
EXPORT_SYMBOL(strcspn);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRPBRK
|
|
/**
|
|
* strpbrk - Find the first occurrence of a set of characters
|
|
* @cs: The string to be searched
|
|
* @ct: The characters to search for
|
|
*/
|
|
char *strpbrk(const char *cs, const char *ct)
|
|
{
|
|
const char *sc1, *sc2;
|
|
|
|
for (sc1 = cs; *sc1 != '\0'; ++sc1) {
|
|
for (sc2 = ct; *sc2 != '\0'; ++sc2) {
|
|
if (*sc1 == *sc2)
|
|
return (char *)sc1;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(strpbrk);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRSEP
|
|
/**
|
|
* strsep - Split a string into tokens
|
|
* @s: The string to be searched
|
|
* @ct: The characters to search for
|
|
*
|
|
* strsep() updates @s to point after the token, ready for the next call.
|
|
*
|
|
* It returns empty tokens, too, behaving exactly like the libc function
|
|
* of that name. In fact, it was stolen from glibc2 and de-fancy-fied.
|
|
* Same semantics, slimmer shape. ;)
|
|
*/
|
|
char *strsep(char **s, const char *ct)
|
|
{
|
|
char *sbegin = *s;
|
|
char *end;
|
|
|
|
if (sbegin == NULL)
|
|
return NULL;
|
|
|
|
end = strpbrk(sbegin, ct);
|
|
if (end)
|
|
*end++ = '\0';
|
|
*s = end;
|
|
return sbegin;
|
|
}
|
|
EXPORT_SYMBOL(strsep);
|
|
#endif
|
|
|
|
/**
|
|
* sysfs_streq - return true if strings are equal, modulo trailing newline
|
|
* @s1: one string
|
|
* @s2: another string
|
|
*
|
|
* This routine returns true iff two strings are equal, treating both
|
|
* NUL and newline-then-NUL as equivalent string terminations. It's
|
|
* geared for use with sysfs input strings, which generally terminate
|
|
* with newlines but are compared against values without newlines.
|
|
*/
|
|
bool sysfs_streq(const char *s1, const char *s2)
|
|
{
|
|
while (*s1 && *s1 == *s2) {
|
|
s1++;
|
|
s2++;
|
|
}
|
|
|
|
if (*s1 == *s2)
|
|
return true;
|
|
if (!*s1 && *s2 == '\n' && !s2[1])
|
|
return true;
|
|
if (*s1 == '\n' && !s1[1] && !*s2)
|
|
return true;
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(sysfs_streq);
|
|
|
|
#ifndef __HAVE_ARCH_MEMSET
|
|
/**
|
|
* memset - Fill a region of memory with the given value
|
|
* @s: Pointer to the start of the area.
|
|
* @c: The byte to fill the area with
|
|
* @count: The size of the area.
|
|
*
|
|
* Do not use memset() to access IO space, use memset_io() instead.
|
|
*/
|
|
void *memset(void *s, int c, size_t count)
|
|
{
|
|
char *xs = s;
|
|
|
|
while (count--)
|
|
*xs++ = c;
|
|
return s;
|
|
}
|
|
EXPORT_SYMBOL(memset);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MEMCPY
|
|
/**
|
|
* memcpy - Copy one area of memory to another
|
|
* @dest: Where to copy to
|
|
* @src: Where to copy from
|
|
* @count: The size of the area.
|
|
*
|
|
* You should not use this function to access IO space, use memcpy_toio()
|
|
* or memcpy_fromio() instead.
|
|
*/
|
|
void *memcpy(void *dest, const void *src, size_t count)
|
|
{
|
|
char *tmp = dest;
|
|
const char *s = src;
|
|
|
|
while (count--)
|
|
*tmp++ = *s++;
|
|
return dest;
|
|
}
|
|
EXPORT_SYMBOL(memcpy);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MEMMOVE
|
|
/**
|
|
* memmove - Copy one area of memory to another
|
|
* @dest: Where to copy to
|
|
* @src: Where to copy from
|
|
* @count: The size of the area.
|
|
*
|
|
* Unlike memcpy(), memmove() copes with overlapping areas.
|
|
*/
|
|
void *memmove(void *dest, const void *src, size_t count)
|
|
{
|
|
char *tmp;
|
|
const char *s;
|
|
|
|
if (dest <= src) {
|
|
tmp = dest;
|
|
s = src;
|
|
while (count--)
|
|
*tmp++ = *s++;
|
|
} else {
|
|
tmp = dest;
|
|
tmp += count;
|
|
s = src;
|
|
s += count;
|
|
while (count--)
|
|
*--tmp = *--s;
|
|
}
|
|
return dest;
|
|
}
|
|
EXPORT_SYMBOL(memmove);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MEMCMP
|
|
/**
|
|
* memcmp - Compare two areas of memory
|
|
* @cs: One area of memory
|
|
* @ct: Another area of memory
|
|
* @count: The size of the area.
|
|
*/
|
|
#undef memcmp
|
|
int memcmp(const void *cs, const void *ct, size_t count)
|
|
{
|
|
const unsigned char *su1, *su2;
|
|
int res = 0;
|
|
|
|
for (su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)
|
|
if ((res = *su1 - *su2) != 0)
|
|
break;
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(memcmp);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_MEMSCAN
|
|
/**
|
|
* memscan - Find a character in an area of memory.
|
|
* @addr: The memory area
|
|
* @c: The byte to search for
|
|
* @size: The size of the area.
|
|
*
|
|
* returns the address of the first occurrence of @c, or 1 byte past
|
|
* the area if @c is not found
|
|
*/
|
|
void *memscan(void *addr, int c, size_t size)
|
|
{
|
|
unsigned char *p = addr;
|
|
|
|
while (size) {
|
|
if (*p == c)
|
|
return (void *)p;
|
|
p++;
|
|
size--;
|
|
}
|
|
return (void *)p;
|
|
}
|
|
EXPORT_SYMBOL(memscan);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_STRSTR
|
|
/**
|
|
* 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)
|
|
{
|
|
int 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;
|
|
}
|
|
EXPORT_SYMBOL(strstr);
|
|
#endif
|
|
|
|
#ifndef __HAVE_ARCH_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;
|
|
}
|
|
EXPORT_SYMBOL(memchr);
|
|
#endif
|