1181834Sroberto 2181834Sroberto#ifndef HAVE_VPRINTF 3181834Sroberto#include "choke-me: no vprintf and no snprintf" 4290001Sglebius choke me. 5181834Sroberto#endif 6181834Sroberto 7181834Sroberto#if defined(HAVE_STDARG_H) 8181834Sroberto# include <stdarg.h> 9181834Sroberto# ifndef VA_START 10181834Sroberto# define VA_START(a, f) va_start(a, f) 11181834Sroberto# define VA_END(a) va_end(a) 12181834Sroberto# endif /* VA_START */ 13181834Sroberto# define SNV_USING_STDARG_H 14181834Sroberto 15181834Sroberto#elif defined(HAVE_VARARGS_H) 16181834Sroberto# include <varargs.h> 17181834Sroberto# ifndef VA_START 18181834Sroberto# define VA_START(a, f) va_start(a) 19181834Sroberto# define VA_END(a) va_end(a) 20181834Sroberto# endif /* VA_START */ 21181834Sroberto# undef SNV_USING_STDARG_H 22181834Sroberto 23181834Sroberto#else 24181834Sroberto# include "must-have-stdarg-or-varargs" 25290001Sglebius choke me. 26181834Sroberto#endif 27181834Sroberto 28181834Srobertostatic int 29181834Srobertosnprintf(char *str, size_t n, char const *fmt, ...) 30181834Sroberto{ 31181834Sroberto va_list ap; 32181834Sroberto int rval; 33181834Sroberto 34181834Sroberto#ifdef VSPRINTF_CHARSTAR 35181834Sroberto char *rp; 36181834Sroberto VA_START(ap, fmt); 37181834Sroberto rp = vsprintf(str, fmt, ap); 38181834Sroberto VA_END(ap); 39181834Sroberto rval = strlen(rp); 40181834Sroberto 41181834Sroberto#else 42181834Sroberto VA_START(ap, fmt); 43181834Sroberto rval = vsprintf(str, fmt, ap); 44181834Sroberto VA_END(ap); 45181834Sroberto#endif 46181834Sroberto 47181834Sroberto if (rval > n) { 48181834Sroberto fprintf(stderr, "snprintf buffer overrun %d > %d\n", rval, (int)n); 49181834Sroberto abort(); 50181834Sroberto } 51181834Sroberto return rval; 52181834Sroberto} 53181834Sroberto 54181834Srobertostatic int 55181834Srobertovsnprintf( char *str, size_t n, char const *fmt, va_list ap ) 56181834Sroberto{ 57181834Sroberto#ifdef VSPRINTF_CHARSTAR 58181834Sroberto return (strlen(vsprintf(str, fmt, ap))); 59181834Sroberto#else 60181834Sroberto return (vsprintf(str, fmt, ap)); 61181834Sroberto#endif 62181834Sroberto} 63