skalibs

Mirror/fork of https://skarnet.org/software/skalibs/
git clone https://ccx.te2000.cz/git/skalibs
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vbprintf.c (487B)

      1 /* ISC license. */
      2 
      3 #include <stdio.h>
      4 #include <stdarg.h>
      5 #include <skalibs/buffer.h>
      6 #include <skalibs/lolstdio.h>
      7 
      8 int vbprintf (buffer *b, char const *format, va_list args)
      9 {
     10   int r ;
     11   {
     12     va_list ugly ;
     13     va_copy(ugly, args) ;
     14     r = vsnprintf(0, 0, format, ugly) ;
     15     va_end(ugly) ;
     16   }
     17   if (r < 0) return r ;
     18   {
     19     char buf[r+1] ;
     20     r = vsnprintf(buf, r + 1, format, args) ;
     21     if (r < 0) return r ;
     22     if (buffer_put(b, buf, r) < r) return -1 ;
     23   }
     24   return r ;
     25 }