Release 4.13 lib/argv_split.c

/*
 * 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;
}

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Oleg Nesterov
29
45.31%
1
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64
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2
100.00%

/**
 * 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);
}
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Oleg Nesterov
6
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1
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26
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2
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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;
}
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Oleg Nesterov
101
57.06%
1
33.33%
Jeremy Fitzhardinge
75
42.37%
1
33.33%
Neil Horman
1
0.56%
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EXPORT_SYMBOL(argv_split);
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Person
Tokens
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CommitProp
Jeremy Fitzhardinge
150
50.85%
1
16.67%
Oleg Nesterov
137
46.44%
1
16.67%
Robert P. J. Day
3
1.02%
1
16.67%
André Goddard Rosa
3
1.02%
1
16.67%
Paul Gortmaker
1
0.34%
1
16.67%
Neil Horman
1
0.34%
1
16.67%
Total
295
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6
100.00%
Directory: lib

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