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// Copyright 2005-2008, various authors
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// This file contains some handy string parsing functions lifted from Linux
// 2.6.27.44, from the files mm/util.c and lib/argv_split.c.
//
// It gets compiled into the hostmot2 driver if the kernel does not provide
// its own versions of these functions: argv_split(), argv_free(), and
// kstrndup().
//
#include <linux/kernel.h>
#include <linux/version.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/module.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,14)
typedef unsigned long gfp_t;
char *kstrdup(const char *s, gfp_t gfp)
{
size_t len = strlen(s)+1;
char *r = kmalloc(len, gfp);
if(r) memcpy(r, s, len);
return r;
}
void *kzalloc(size_t sz, gfp_t gfp) {
void *r = kmalloc(sz, gfp);
if(r) memset(r, 0, sz);
return r;
}
#endif
/**
* kstrndup - allocate space for and copy an existing string
* @s: the string to duplicate
* @max: read at most @max chars from @s
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*/
char *kstrndup(const char *s, size_t max, gfp_t gfp)
{
size_t len;
char *buf;
if (!s)
return NULL;
len = strnlen(s, max);
buf = kmalloc(len+1, gfp);
if (buf) {
memcpy(buf, s, len);
buf[len] = '\0';
}
return buf;
}
/*
* Helper function for splitting a string into an argv-like array.
*/
static const char *skip_sep(const char *cp)
{
while (*cp && isspace(*cp))
cp++;
return cp;
}
static const char *skip_arg(const char *cp)
{
while (*cp && !isspace(*cp))
cp++;
return cp;
}
static int count_argc(const char *str)
{
int count = 0;
while (*str) {
str = skip_sep(str);
if (*str) {
count++;
str = skip_arg(str);
}
}
return count;
}
/**
* argv_free - free an argv
* @argv - the argument vector to be freed
*
* Frees an argv and the strings it points to.
*/
void argv_free(char **argv)
{
char **p;
for (p = argv; *p; p++)
kfree(*p);
kfree(argv);
}
/**
* argv_split - split a string at whitespace, returning an argv
* @gfp: the GFP mask used to allocate memory
* @str: the string to be split
* @argcp: returned argument count
*
* Returns an array of pointers to strings which are split out from
* @str. This is performed by strictly splitting on white-space; no
* quote processing is performed. Multiple whitespace characters are
* considered to be a single argument separator. The returned array
* is always NULL-terminated. Returns NULL on memory allocation
* failure.
*/
char **argv_split(gfp_t gfp, const char *str, int *argcp)
{
int argc = count_argc(str);
char **argv = kzalloc(sizeof(*argv) * (argc+1), gfp);
char **argvp;
if (argv == NULL)
goto out;
if (argcp)
*argcp = argc;
argvp = argv;
while (*str) {
str = skip_sep(str);
if (*str) {
const char *p = str;
char *t;
str = skip_arg(str);
t = kstrndup(p, str-p, gfp);
if (t == NULL)
goto fail;
*argvp++ = t;
}
}
*argvp = NULL;
out:
return argv;
fail:
argv_free(argv);
return NULL;
}
#endif
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