mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 13:53:33 +00:00
Code Issues Releases Wiki Activity

tools/nolibc/stdlib: extract the stdlib-specific functions to their own file

Browse source 
The new file stdlib.h contains the definitions of functions that
are usually found in stdlib.h. Many more could certainly 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 17:23:19 +01:00 committed by Paul E. McKenney
parent bd8c8fbb86
commit 06fdba53e0
2 changed files with 86 additions and 66 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

67
tools/include/nolibc/nolibc.h
View file

@ -87,40 +87,11 @@
#include "arch.h"
#include "types.h"
#include "sys.h"
#include "stdlib.h"
/* Used by programs to avoid std includes */
#define NOLIBC
static __attribute__((unused))
int tcsetpgrp(int fd, pid_t pid)
{
return ioctl(fd, TIOCSPGRP, &pid);
}
static __attribute__((unused))
unsigned int sleep(unsigned int seconds)
{
struct timeval my_timeval = { seconds, 0 };
if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
return my_timeval.tv_sec + !!my_timeval.tv_usec;
else
return 0;
}
static __attribute__((unused))
int msleep(unsigned int msecs)
{
struct timeval my_timeval = { msecs / 1000, (msecs % 1000) * 1000 };
if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
return (my_timeval.tv_sec * 1000) +
(my_timeval.tv_usec / 1000) +
!!(my_timeval.tv_usec % 1000);
else
return 0;
}
/* 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
@ -216,35 +187,6 @@ int isdigit(int c)
return (unsigned int)(c - '0') <= 9;
}
static __attribute__((unused))
long atol(const char *s)
{
unsigned long ret = 0;
unsigned long d;
int neg = 0;
if (*s == '-') {
neg = 1;
s++;
}
while (1) {
d = (*s++) - '0';
if (d > 9)
break;
ret *= 10;
ret += d;
}
return neg ? -ret : ret;
}
static __attribute__((unused))
int atoi(const char *s)
{
return atol(s);
}
static __attribute__((unused))
const char *ltoa(long in)
{
@ -273,13 +215,6 @@ void *memcpy(void *dst, const void *src, size_t len)
return memmove(dst, src, len);
}
/* needed by libgcc for divide by zero */
__attribute__((weak,unused))
int raise(int signal)
{
return kill(getpid(), signal);
}
/* Here come a few helper functions */
static __attribute__((unused))

85
tools/include/nolibc/stdlib.h Normal file
View file

@ -0,0 +1,85 @@
/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
/*
* stdlib function definitions for NOLIBC
* Copyright (C) 2017-2021 Willy Tarreau <w@1wt.eu>
*/
#ifndef _NOLIBC_STDLIB_H
#define _NOLIBC_STDLIB_H
#include "std.h"
#include "arch.h"
#include "types.h"
#include "sys.h"
/*
* As much as possible, please keep functions alphabetically sorted.
*/
static __attribute__((unused))
long atol(const char *s)
{
unsigned long ret = 0;
unsigned long d;
int neg = 0;
if (*s == '-') {
neg = 1;
s++;
}
while (1) {
d = (*s++) - '0';
if (d > 9)
break;
ret *= 10;
ret += d;
}
return neg ? -ret : ret;
}
static __attribute__((unused))
int atoi(const char *s)
{
return atol(s);
}
static __attribute__((unused))
int msleep(unsigned int msecs)
{
struct timeval my_timeval = { msecs / 1000, (msecs % 1000) * 1000 };
if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
return (my_timeval.tv_sec * 1000) +
(my_timeval.tv_usec / 1000) +
!!(my_timeval.tv_usec % 1000);
else
return 0;
}
/* This one is not marked static as it's needed by libgcc for divide by zero */
__attribute__((weak,unused))
int raise(int signal)
{
return kill(getpid(), signal);
}
static __attribute__((unused))
unsigned int sleep(unsigned int seconds)
{
struct timeval my_timeval = { seconds, 0 };
if (sys_select(0, 0, 0, 0, &my_timeval) < 0)
return my_timeval.tv_sec + !!my_timeval.tv_usec;
else
return 0;
}
static __attribute__((unused))
int tcsetpgrp(int fd, pid_t pid)
{
return ioctl(fd, TIOCSPGRP, &pid);
}
#endif /* _NOLIBC_STDLIB_H */