snprintf.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:1k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: snprintf.c,v 11.10 2002/01/11 15:51:28 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <stdio.h>
- #endif
- #include "db_int.h"
- /*
- * snprintf --
- * Bounded version of sprintf.
- *
- * PUBLIC: #ifndef HAVE_SNPRINTF
- * PUBLIC: int snprintf __P((char *, size_t, const char *, ...));
- * PUBLIC: #endif
- */
- #ifndef HAVE_SNPRINTF
- int
- #ifdef __STDC__
- snprintf(char *str, size_t n, const char *fmt, ...)
- #else
- snprintf(str, n, fmt, va_alist)
- char *str;
- size_t n;
- const char *fmt;
- va_dcl
- #endif
- {
- static int ret_charpnt = -1;
- va_list ap;
- int len;
- COMPQUIET(n, 0);
- /*
- * Some old versions of sprintf return a pointer to the first argument
- * instead of a character count. Assume the return value of snprintf,
- * vsprintf, etc. will be the same as sprintf, and check the easy one.
- *
- * We do this test at run-time because it's not a test we can do in a
- * cross-compilation environment.
- */
- if (ret_charpnt == -1) {
- char buf[10];
- ret_charpnt =
- sprintf(buf, "123") != 3 ||
- sprintf(buf, "123456789") != 9 ||
- sprintf(buf, "1234") != 4;
- }
- #ifdef __STDC__
- va_start(ap, fmt);
- #else
- va_start(ap);
- #endif
- len = vsprintf(str, fmt, ap);
- va_end(ap);
- return (ret_charpnt ? (int)strlen(str) : len);
- }
- #endif