[PATCH] Implement kasprintf
Implement kasprintf, a kernel version of asprintf. This allocates the memory required for the formatted string, including the trailing '\0'. Returns NULL on allocation failure. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -117,6 +117,8 @@ extern int scnprintf(char * buf, size_t size, const char * fmt, ...)
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__attribute__ ((format (printf, 3, 4)));
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extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args)
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__attribute__ ((format (printf, 3, 0)));
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extern char *kasprintf(gfp_t gfp, const char *fmt, ...)
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__attribute__ ((format (printf, 2, 3)));
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extern int sscanf(const char *, const char *, ...)
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__attribute__ ((format (scanf, 2, 3)));
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@ -849,3 +849,26 @@ int sscanf(const char * buf, const char * fmt, ...)
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}
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EXPORT_SYMBOL(sscanf);
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/* Simplified asprintf. */
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char *kasprintf(gfp_t gfp, const char *fmt, ...)
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{
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va_list ap;
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unsigned int len;
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char *p;
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va_start(ap, fmt);
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len = vsnprintf(NULL, 0, fmt, ap);
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va_end(ap);
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p = kmalloc(len+1, gfp);
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if (!p)
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return NULL;
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va_start(ap, fmt);
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vsnprintf(p, len+1, fmt, ap);
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va_end(ap);
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return p;
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}
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EXPORT_SYMBOL(kasprintf);
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