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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596// 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_array(argc + 2, sizeof(*argv), 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);