lib/argv_split.c


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#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;
}

void argv_free(char **argv)
{
	char **p;
	for (p = argv; *p; p++)
		kfree(*p);

	kfree(argv);
}
EXPORT_SYMBOL(argv_free);

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);