/* * Helper function for splitting a string into an argv-like array. */#include <linux/kernel.h>#include <linux/ctype.h>#include <linux/string.h>#include <linux/slab.h>#include <linux/export.h>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_spaces(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; if (argcp) *argcp = argc; argvp = argv; while (*str) { str = skip_spaces(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);
/*
* Helper function for splitting a string into an argv-like array.
*/
#include <linux/kernel.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/export.h>
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_spaces(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;
if (argcp)
*argcp = argc;
argvp = argv;
while (*str) {
str = skip_spaces(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);