LXR linux/lib/kasprintf.c

   1/*
   2 *  linux/lib/kasprintf.c
   3 *
   4 *  Copyright (C) 1991, 1992  Linus Torvalds
   5 */
   6
   7#include <stdarg.h>
   8#include <linux/export.h>
   9#include <linux/slab.h>
  10#include <linux/types.h>
  11#include <linux/string.h>
  12
  13/* Simplified asprintf. */
  14char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
  15{
  16        unsigned int len;
  17        char *p;
  18        va_list aq;
  19
  20        va_copy(aq, ap);
  21        len = vsnprintf(NULL, 0, fmt, aq);
  22        va_end(aq);
  23
  24        p = kmalloc_track_caller(len+1, gfp);
  25        if (!p)
  26                return NULL;
  27
  28        vsnprintf(p, len+1, fmt, ap);
  29
  30        return p;
  31}
  32EXPORT_SYMBOL(kvasprintf);
  33
  34char *kasprintf(gfp_t gfp, const char *fmt, ...)
  35{
  36        va_list ap;
  37        char *p;
  38
  39        va_start(ap, fmt);
  40        p = kvasprintf(gfp, fmt, ap);
  41        va_end(ap);
  42
  43        return p;
  44}
  45EXPORT_SYMBOL(kasprintf);
  46