char * asniprintf (char *buf, size_t *lenp, const char *fmt, ...) { int ret; va_list ap; FILE f; size_t len = *lenp; struct _reent *ptr = _REENT; if (buf && len) { /* mark an existing buffer, but allow allocation of larger string */ f._flags = __SWR | __SSTR | __SOPT; } else { /* mark a zero-length reallocatable buffer */ f._flags = __SWR | __SSTR | __SMBF; len = 0; buf = NULL; } f._bf._base = f._p = (unsigned char *) buf; /* For now, inherit the 32-bit signed limit of FILE._bf._size. FIXME - it would be nice to rewrite sys/reent.h to support size_t for _size. */ if (len > INT_MAX) { __errno_r(ptr) = EOVERFLOW; return NULL; } f._bf._size = f._w = len; f._file = -1; /* No file. */ va_start (ap, fmt); ret = _svfiprintf_r (ptr, &f, fmt, ap); va_end (ap); if (ret < 0) return NULL; *lenp = ret; *f._p = '\0'; return (char *) f._bf._base; }
int _svfprintf_r( struct _reent *r, FILE *stream, const char *format, va_list ap ) { return _svfiprintf_r( r, stream, format, ap ); }
_DEFUN(_asiprintf_r, (ptr, strp, fmt), struct _reent *ptr _AND char **strp _AND const char *fmt _DOTS) { int ret; va_list ap; FILE f; /* mark a zero-length reallocatable buffer */ f._flags = __SWR | __SSTR | __SMBF; f._bf._base = f._p = NULL; f._bf._size = f._w = 0; f._file = -1; /* No file. */ va_start (ap, fmt); ret = _svfiprintf_r (ptr, &f, fmt, ap); va_end (ap); if (ret >= 0) { *f._p = 0; *strp = f._bf._base; } return (ret); } #ifndef _REENT_ONLY int _DEFUN(asiprintf, (strp, fmt), char **strp _AND const char *fmt _DOTS)