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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [stdio/] [vasnprintf.c] - Rev 207
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/* Copyright (C) 2007 Eric Blake * Permission to use, copy, modify, and distribute this software * is freely granted, provided that this notice is preserved. */ /* This code was derived from asprintf.c */ /* doc in vfprintf.c */ #include <_ansi.h> #include <reent.h> #include <stdio.h> #include <stdarg.h> #include <limits.h> #include <errno.h> #include "local.h" char * _DEFUN(_vasnprintf_r, (ptr, buf, lenp, fmt, ap), struct _reent *ptr _AND char *buf _AND size_t *lenp _AND const char *fmt _AND va_list ap) { int ret; FILE f; size_t len = *lenp; 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) { ptr->_errno = EOVERFLOW; return NULL; } f._bf._size = f._w = len; f._file = -1; /* No file. */ ret = _svfprintf_r (ptr, &f, fmt, ap); if (ret < 0) return NULL; *lenp = ret; *f._p = '\0'; return (char *) f._bf._base; } #ifndef _REENT_ONLY char * _DEFUN(vasnprintf, (buf, lenp, fmt, ap), char *buf _AND size_t *lenp _AND const char *fmt _AND va_list ap) { return _vasnprintf_r (_REENT, buf, lenp, fmt, ap); } #endif /* ! _REENT_ONLY */