4.72 viprintf, vfiprintf, vsiprintf, vsniprintf, vasiprintf, vasniprintf—format argument list (integer only)

Synopsis

     #include <stdio.h>
     #include <stdarg.h>
     int viprintf(const char *fmt, va_list list);
     int vfiprintf(FILE *fp, const char *fmt, va_list list);
     int vsiprintf(char *str, const char *fmt, va_list list);
     int vsniprintf(char *str, size_t size, const char *fmt,
         va_list list);
     int vasiprintf(char **strp, const char *fmt, va_list list);
     char *vasniprintf(char *str, size_t *size, const char *fmt,
         va_list list);
     
     int _viprintf_r(struct _reent *reent, const char *fmt,
         va_list list);
     int _vfiprintf_r(struct _reent *reent, FILE *fp,
         const char *fmt, va_list list);
     int _vsiprintf_r(struct _reent *reent, char *str,
         const char *fmt, va_list list);
     int _vsniprintf_r(struct _reent *reent, char *str,
         size_t size, const char *fmt, va_list list);
     int _vasiprintf_r(struct _reent *reent, char **str,
         const char *fmt, va_list list);
     char *_vasniprintf_r(struct _reent *reent, char *str,
         size_t *size, const char *fmt, va_list list);
     

Description
viprintf, vfiprintf, vasiprintf, vsiprintf, vsniprintf, and vasniprintf are (respectively) variants of iprintf, fiprintf, asiprintf, siprintf, sniprintf, and asniprintf. They differ only in allowing their caller to pass the variable argument list as a va_list object (initialized by va_start) rather than directly accepting a variable number of arguments. The caller is responsible for calling va_end.

_viprintf_r, _vfiprintf_r, _vasiprintf_r, _vsiprintf_r, _vsniprintf_r, and _vasniprintf_r are reentrant versions of the above.

Returns
The return values are consistent with the corresponding functions:

Portability
All of these functions are newlib extensions.

Supporting OS subroutines required: close, fstat, isatty, lseek, read, sbrk, write.