mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 16:35:01 +07:00
d84d1cc764
argv_split() is a helper function which takes a string, splits it at whitespace, and returns a NULL-terminated argv vector. This is deliberately simple - it does no quote processing of any kind. [ Seems to me that this is something which is already being done in the kernel, but I couldn't find any other implementations, either to steal or replace. Keep an eye out. ] Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Randy Dunlap <randy.dunlap@oracle.com>
106 lines
1.8 KiB
C
106 lines
1.8 KiB
C
/*
|
|
* Helper function for splitting a string into an argv-like array.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/bug.h>
|
|
|
|
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);
|
|
}
|
|
EXPORT_SYMBOL(argv_free);
|
|
|
|
/**
|
|
* 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;
|
|
|
|
*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;
|
|
}
|
|
EXPORT_SYMBOL(argv_split);
|