5a56db1c0f
Replace an irrelevant include of bug.h with the more appropriate includes of slab.h and module.h. it's not as if the original inclusion is an error, it's simply not related to the contents of that source file, while the other two are. compile-tested on i386. Signed-off-by: Robert P. J. Day <rpjday@mindspring.com> Signed-off-by: Adrian Bunk <bunk@kernel.org>
108 lines
1.8 KiB
C
108 lines
1.8 KiB
C
/*
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* Helper function for splitting a string into an argv-like array.
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*/
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#include <linux/kernel.h>
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#include <linux/ctype.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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static const char *skip_sep(const char *cp)
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{
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while (*cp && isspace(*cp))
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cp++;
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return cp;
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}
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static const char *skip_arg(const char *cp)
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{
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while (*cp && !isspace(*cp))
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cp++;
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return cp;
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}
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static int count_argc(const char *str)
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{
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int count = 0;
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while (*str) {
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str = skip_sep(str);
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if (*str) {
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count++;
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str = skip_arg(str);
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}
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}
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return count;
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}
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/**
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* argv_free - free an argv
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* @argv - the argument vector to be freed
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*
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* Frees an argv and the strings it points to.
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*/
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void argv_free(char **argv)
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{
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char **p;
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for (p = argv; *p; p++)
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kfree(*p);
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kfree(argv);
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}
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EXPORT_SYMBOL(argv_free);
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/**
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* argv_split - split a string at whitespace, returning an argv
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* @gfp: the GFP mask used to allocate memory
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* @str: the string to be split
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* @argcp: returned argument count
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*
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* Returns an array of pointers to strings which are split out from
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* @str. This is performed by strictly splitting on white-space; no
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* quote processing is performed. Multiple whitespace characters are
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* considered to be a single argument separator. The returned array
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* is always NULL-terminated. Returns NULL on memory allocation
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* failure.
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*/
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char **argv_split(gfp_t gfp, const char *str, int *argcp)
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{
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int argc = count_argc(str);
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char **argv = kzalloc(sizeof(*argv) * (argc+1), gfp);
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char **argvp;
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if (argv == NULL)
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goto out;
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if (argcp)
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*argcp = argc;
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argvp = argv;
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while (*str) {
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str = skip_sep(str);
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if (*str) {
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const char *p = str;
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char *t;
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str = skip_arg(str);
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t = kstrndup(p, str-p, gfp);
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if (t == NULL)
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goto fail;
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*argvp++ = t;
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}
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}
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*argvp = NULL;
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out:
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return argv;
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fail:
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argv_free(argv);
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return NULL;
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}
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EXPORT_SYMBOL(argv_split);
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