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e3e651c480
Rasmus Villemoes <ravi@prevas.dk> says: There are quite a few places where we allocate X+1 bytes, initialize the first X bytes via memcpy() and then set the last byte to 0. The kernel has a helper for that, kmemdup_nul(). Introduce a similar one, and start making use of it in a few places. Also the existing memdup() helper can be put to more use. There are lots more places one could modify. But for code shared with host tools, one would need to do some refactoring, putting memdup() and memdup_nul() in their own str-util.c TU which could then also be included in the tools build. Link: https://lore.kernel.org/r/20260421075439.16696-1-ravi@prevas.dk
170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
#ifndef _LINUX_STRING_H_
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#define _LINUX_STRING_H_
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#include <linux/types.h> /* for size_t */
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#include <linux/stddef.h> /* for NULL */
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern char * ___strtok;
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extern char * strpbrk(const char *,const char *);
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extern char * strtok(char *,const char *);
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extern char * strsep(char **,const char *);
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extern __kernel_size_t strspn(const char *,const char *);
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/*
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* Include machine specific inline routines
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*/
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#include <asm/string.h>
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#ifndef __HAVE_ARCH_STRCPY
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extern char * strcpy(char *,const char *);
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#endif
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#ifndef __HAVE_ARCH_STRNCPY
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extern char * strncpy(char *,const char *, __kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_STRLCPY
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size_t strlcpy(char *, const char *, size_t);
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#endif
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#ifndef __HAVE_ARCH_STRCAT
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extern char * strcat(char *, const char *);
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#endif
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#ifndef __HAVE_ARCH_STRNCAT
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extern char * strncat(char *, const char *, __kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_STRLCAT
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size_t strlcat(char *, const char *, size_t);
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#endif
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#ifndef __HAVE_ARCH_STRCMP
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extern int strcmp(const char *,const char *);
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#endif
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#ifndef __HAVE_ARCH_STRNCMP
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extern int strncmp(const char *,const char *,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_STRCASECMP
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int strcasecmp(const char *s1, const char *s2);
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#endif
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#ifndef __HAVE_ARCH_STRNCASECMP
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extern int strncasecmp(const char *s1, const char *s2, __kernel_size_t len);
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#endif
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#ifndef __HAVE_ARCH_STRCHR
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extern char * strchr(const char *,int);
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#endif
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/**
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* strchrnul() - return position of a character in the string, or end of string
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*
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* The strchrnul() function is like strchr() except that if c is not found
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* in s, then it returns a pointer to the nul byte at the end of s, rather than
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* NULL
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* @s: string to search
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* @c: character to search for
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* Return: position of @c in @s, or end of @s if not found
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*/
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const char *strchrnul(const char *s, int c);
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#ifndef __HAVE_ARCH_STRRCHR
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extern char * strrchr(const char *,int);
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#endif
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#include <linux/linux_string.h>
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#ifndef __HAVE_ARCH_STRSTR
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extern char * strstr(const char *,const char *);
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#endif
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#ifndef __HAVE_ARCH_STRNSTR
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extern char *strnstr(const char *, const char *, size_t);
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#endif
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#ifndef __HAVE_ARCH_STRLEN
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extern __kernel_size_t strlen(const char *);
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#endif
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#ifndef __HAVE_ARCH_STRNLEN
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extern __kernel_size_t strnlen(const char *,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_STRCSPN
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/**
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* strcspn() - find span of string without given characters
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*
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* Calculates the length of the initial segment of @s which consists entirely
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* of bsytes not in reject.
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*
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* @s: string to search
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* @reject: strings which cause the search to halt
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* Return: number of characters at the start of @s which are not in @reject
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*/
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size_t strcspn(const char *s, const char *reject);
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#endif
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#ifdef CONFIG_SANDBOX
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# define strdup sandbox_strdup
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# define strndup sandbox_strndup
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#endif
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extern char * strdup(const char *);
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extern char * strndup(const char *, size_t);
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extern const char *strdup_const(const char *s);
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extern void kfree_const(const void *x);
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#ifndef __HAVE_ARCH_STRSWAB
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extern char * strswab(const char *);
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#endif
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#ifndef __HAVE_ARCH_MEMSET
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extern void * memset(void *,int,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_MEMCPY
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extern void * memcpy(void *,const void *,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_MEMMOVE
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extern void * memmove(void *,const void *,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_MEMSCAN
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extern void * memscan(void *,int,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_MEMCMP
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extern int memcmp(const void *,const void *,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_MEMCHR
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extern void * memchr(const void *,int,__kernel_size_t);
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#endif
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#ifndef __HAVE_ARCH_MEMCHR_INV
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void *memchr_inv(const void *, int, size_t);
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#endif
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/**
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* memdup() - allocate a buffer and copy in the contents
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*
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* Note that this returns a valid pointer even if @len is 0
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*
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* @src: data to copy in
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* @len: number of bytes to copy
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* Return: allocated buffer with the copied contents, or NULL if not enough
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* memory is available
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*
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*/
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void *memdup(const void *src, size_t len);
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/**
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* memdup_nul() - allocate a buffer and copy in the contents, appending a nul byte
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*
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* Note that this returns a valid pointer even if @len is 0
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*
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* @src: data to copy in
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* @len: number of bytes to copy
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* Return: allocated buffer with the copied contents and an extra nul byte,
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* or NULL if not enough memory is available
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*
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*/
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void *memdup_nul(const void *src, size_t len);
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unsigned long ustrtoul(const char *cp, char **endp, unsigned int base);
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unsigned long long ustrtoull(const char *cp, char **endp, unsigned int base);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _LINUX_STRING_H_ */
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