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  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. */
  14. char *kvasprintf(gfp_t gfp, const char *fmt, va_list ap)
  15. {
  16.         unsigned int first, second;
  17.         char *p;
  18.         va_list aq;
  19.  
  20.         va_copy(aq, ap);
  21.         first = vsnprintf(NULL, 0, fmt, aq);
  22.         va_end(aq);
  23.  
  24.     p = kmalloc(first+1, gfp);
  25.         if (!p)
  26.                 return NULL;
  27.  
  28.         second = vsnprintf(p, first+1, fmt, ap);
  29.         WARN(first != second, "different return values (%u and %u) from vsnprintf(\"%s\", ...)",
  30.              first, second, fmt);
  31.  
  32.         return p;
  33. }
  34. EXPORT_SYMBOL(kvasprintf);
  35.  
  36. /*
  37.  * If fmt contains no % (or is exactly %s), use kstrdup_const. If fmt
  38.  * (or the sole vararg) points to rodata, we will then save a memory
  39.  * allocation and string copy. In any case, the return value should be
  40.  * freed using kfree_const().
  41.  */
  42. const char *kvasprintf_const(gfp_t gfp, const char *fmt, va_list ap)
  43. {
  44.         if (!strchr(fmt, '%'))
  45.         return strdup(fmt);
  46.         if (!strcmp(fmt, "%s"))
  47.         return strdup(va_arg(ap, const char*));
  48.         return kvasprintf(gfp, fmt, ap);
  49. }
  50. EXPORT_SYMBOL(kvasprintf_const);
  51.  
  52. char *kasprintf(gfp_t gfp, const char *fmt, ...)
  53. {
  54.         va_list ap;
  55.         char *p;
  56.  
  57.         va_start(ap, fmt);
  58.         p = kvasprintf(gfp, fmt, ap);
  59.         va_end(ap);
  60.  
  61.         return p;
  62. }
  63. EXPORT_SYMBOL(kasprintf);
  64.