// SPDX-License-Identifier: GPL-2.0/* * 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 int count_argc(const char *str){ int count = 0; bool was_space; for (was_space = true; *str; str++) { if (isspace(*str)) { was_space = true; } else if (was_space) { was_space = false; count++; } } 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){ argv--; kfree(argv[0]); 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. * * The source string at `str' may be undergoing concurrent alteration via * userspace sysctl activity (at least). The argv_split() implementation * attempts to handle this gracefully by taking a local copy to work on. */char **argv_split(gfp_t gfp, const char *str, int *argcp){ char *argv_str; bool was_space; char **argv, **argv_ret; int argc; argv_str = kstrndup(str, KMALLOC_MAX_SIZE - 1, gfp); if (!argv_str) return NULL; argc = count_argc(argv_str); argv = kmalloc(sizeof(*argv) * (argc + 2), gfp); if (!argv) { kfree(argv_str); return NULL; } *argv = argv_str; argv_ret = ++argv; for (was_space = true; *argv_str; argv_str++) { if (isspace(*argv_str)) { was_space = true; *argv_str = 0; } else if (was_space) { was_space = false; *argv++ = argv_str; } } *argv = NULL; if (argcp) *argcp = argc; return argv_ret;}EXPORT_SYMBOL(argv_split);
// SPDX-License-Identifier: GPL-2.0
/*
* 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 int count_argc(const char *str)
{
int count = 0;
bool was_space;
for (was_space = true; *str; str++) {
if (isspace(*str)) {
was_space = true;
} else if (was_space) {
was_space = false;
count++;
}
}
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)
{
argv--;
kfree(argv[0]);
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.
*
* The source string at `str' may be undergoing concurrent alteration via
* userspace sysctl activity (at least). The argv_split() implementation
* attempts to handle this gracefully by taking a local copy to work on.
*/
char **argv_split(gfp_t gfp, const char *str, int *argcp)
{
char *argv_str;
bool was_space;
char **argv, **argv_ret;
int argc;
argv_str = kstrndup(str, KMALLOC_MAX_SIZE - 1, gfp);
if (!argv_str)
return NULL;
argc = count_argc(argv_str);
argv = kmalloc(sizeof(*argv) * (argc + 2), gfp);
if (!argv) {
kfree(argv_str);
return NULL;
}
*argv = argv_str;
argv_ret = ++argv;
for (was_space = true; *argv_str; argv_str++) {
if (isspace(*argv_str)) {
was_space = true;
*argv_str = 0;
} else if (was_space) {
was_space = false;
*argv++ = argv_str;
}
}
*argv = NULL;
if (argcp)
*argcp = argc;
return argv_ret;
}
EXPORT_SYMBOL(argv_split);