mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2025-01-23 08:35:19 -05:00
Code Activity

tools/nolibc/string: split the string functions into string.h

Browse source 
The string manipulation functions (mem*, str*) are now found in
string.h. The file depends on almost nothing and will be
usable from other includes if needed. Maybe more functions could
be added.

Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Willy Tarreau 2022-02-07 17:23:20 +01:00 • committed by Paul E. McKenney
parent 06fdba53e0
commit c91eb03389
2 changed files with 108 additions and 95 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

96
tools/include/nolibc/nolibc.h
View file

@ -88,99 +88,11 @@
#include "types.h"
#include "sys.h"
#include "stdlib.h"
#include "string.h"
/* Used by programs to avoid std includes */
#define NOLIBC
/* some size-optimized reimplementations of a few common str* and mem*
* functions. They're marked static, except memcpy() and raise() which are used
* by libgcc on ARM, so they are marked weak instead in order not to cause an
* error when building a program made of multiple files (not recommended).
*/
static __attribute__((unused))
void *memmove(void *dst, const void *src, size_t len)
{
ssize_t pos = (dst <= src) ? -1 : (long)len;
void *ret = dst;
while (len--) {
pos += (dst <= src) ? 1 : -1;
((char *)dst)[pos] = ((char *)src)[pos];
}
return ret;
}
static __attribute__((unused))
void *memset(void *dst, int b, size_t len)
{
char *p = dst;
while (len--)
*(p++) = b;
return dst;
}
static __attribute__((unused))
int memcmp(const void *s1, const void *s2, size_t n)
{
size_t ofs = 0;
char c1 = 0;
while (ofs < n && !(c1 = ((char *)s1)[ofs] - ((char *)s2)[ofs])) {
ofs++;
}
return c1;
}
static __attribute__((unused))
char *strcpy(char *dst, const char *src)
{
char *ret = dst;
while ((*dst++ = *src++));
return ret;
}
static __attribute__((unused))
char *strchr(const char *s, int c)
{
while (*s) {
if (*s == (char)c)
return (char *)s;
s++;
}
return NULL;
}
static __attribute__((unused))
char *strrchr(const char *s, int c)
{
const char *ret = NULL;
while (*s) {
if (*s == (char)c)
ret = s;
s++;
}
return (char *)ret;
}
static __attribute__((unused))
size_t nolibc_strlen(const char *str)
{
size_t len;
for (len = 0; str[len]; len++);
return len;
}
#define strlen(str) ({ \
__builtin_constant_p((str)) ? \
__builtin_strlen((str)) : \
nolibc_strlen((str)); \
})
static __attribute__((unused))
int isdigit(int c)
{
@ -209,12 +121,6 @@ const char *ltoa(long in)
return pos + 1;
}
__attribute__((weak,unused))
void *memcpy(void *dst, const void *src, size_t len)
{
return memmove(dst, src, len);
}
/* Here come a few helper functions */
static __attribute__((unused))

107
tools/include/nolibc/string.h Normal file
View file

@ -0,0 +1,107 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* string function definitions for NOLIBC
* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
*/
#ifndef _NOLIBC_STRING_H
#define _NOLIBC_STRING_H
#include "std.h"
/*
* As much as possible, please keep functions alphabetically sorted.
*/
static __attribute__((unused))
int memcmp(const void *s1, const void *s2, size_t n)
{
size_t ofs = 0;
char c1 = 0;
while (ofs < n && !(c1 = ((char *)s1)[ofs] - ((char *)s2)[ofs])) {
ofs++;
}
return c1;
}
static __attribute__((unused))
void *memmove(void *dst, const void *src, size_t len)
{
ssize_t pos = (dst <= src) ? -1 : (long)len;
void *ret = dst;
while (len--) {
pos += (dst <= src) ? 1 : -1;
((char *)dst)[pos] = ((char *)src)[pos];
}
return ret;
}
/* must be exported, as it's used by libgcc on ARM */
__attribute__((weak,unused))
void *memcpy(void *dst, const void *src, size_t len)
{
return memmove(dst, src, len);
}
static __attribute__((unused))
void *memset(void *dst, int b, size_t len)
{
char *p = dst;
while (len--)
*(p++) = b;
return dst;
}
static __attribute__((unused))
char *strchr(const char *s, int c)
{
while (*s) {
if (*s == (char)c)
return (char *)s;
s++;
}
return NULL;
}
static __attribute__((unused))
char *strcpy(char *dst, const char *src)
{
char *ret = dst;
while ((*dst++ = *src++));
return ret;
}
/* this function is only used with arguments that are not constants */
static __attribute__((unused))
size_t nolibc_strlen(const char *str)
{
size_t len;
for (len = 0; str[len]; len++);
return len;
}
#define strlen(str) ({ \
__builtin_constant_p((str)) ? \
__builtin_strlen((str)) : \
nolibc_strlen((str)); \
})
static __attribute__((unused))
char *strrchr(const char *s, int c)
{
const char *ret = NULL;
while (*s) {
if (*s == (char)c)
ret = s;
s++;
}
return (char *)ret;
}
#endif /* _NOLIBC_STRING_H */