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authorhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 02:41:33 -0500
committerhongbotian <hongbo.tianhongbo@huawei.com>2015-11-30 02:43:36 -0500
commit9401f816dd0d9d550fe98a8507224bde51c4b847 (patch)
tree94f2d7a7893a787bafdca8b5ef063ea316938874 /rubbos/app/tomcat-connectors-1.2.32-src/native/common/ap_snprintf.h
parente8ec7aa8e38a93f5b034ac74cebce5de23710317 (diff)
upload tomcat
JIRA: BOTTLENECK-7 Change-Id: I875d474869efd76ca203c30b60ebc0c3ee606d0e Signed-off-by: hongbotian <hongbo.tianhongbo@huawei.com>
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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * The ap_vsnprintf/ap_snprintf functions are based on, and used with the
+ * permission of, the SIO stdio-replacement strx_* functions by Panos
+ * Tsirigotis <panos@alumni.cs.colorado.edu> for xinetd.
+ */
+
+#ifndef APACHE_AP_SNPRINTF_H
+#define APACHE_AP_SNPRINTF_H
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <limits.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* stuff marked API_EXPORT is part of the API, and intended for use
+ * by modules
+ */
+#ifndef API_EXPORT
+#define API_EXPORT(type) type
+#endif
+
+/* Stuff marked API_EXPORT_NONSTD is part of the API, and intended for
+ * use by modules. The difference between API_EXPORT and
+ * API_EXPORT_NONSTD is that the latter is required for any functions
+ * which use varargs or are used via indirect function call. This
+ * is to accomodate the two calling conventions in windows dlls.
+ */
+#ifndef API_EXPORT_NONSTD
+#define API_EXPORT_NONSTD(type) type
+#endif
+
+#if !defined(__GNUC__) || __GNUC__ < 2 || \
+ (__GNUC__ == 2 && __GNUC_MINOR__ < 7) ||\
+ defined(NEXT)
+#define __attribute__(__x)
+#endif
+
+/* These macros allow correct support of 8-bit characters on systems which
+ * support 8-bit characters. Pretty dumb how the cast is required, but
+ * that's legacy libc for ya. These new macros do not support EOF like
+ * the standard macros do. Tough.
+ */
+#define ap_isalpha(c) (isalpha(((unsigned char)(c))))
+#define ap_isdigit(c) (isdigit(((unsigned char)(c))))
+#define ap_islower(c) (islower(((unsigned char)(c))))
+
+
+/* ap_vformatter() is a generic printf-style formatting routine
+ * with some extensions. The extensions are:
+ *
+ * %pA takes a struct in_addr *, and prints it as a.b.c.d
+ * %pI takes a struct sockaddr_in * and prints it as a.b.c.d:port
+ * %pp takes a void * and outputs it in hex
+ *
+ * The %p hacks are to force gcc's printf warning code to skip
+ * over a pointer argument without complaining. This does
+ * mean that the ANSI-style %p (output a void * in hex format) won't
+ * work as expected at all, but that seems to be a fair trade-off
+ * for the increased robustness of having printf-warnings work.
+ *
+ * Additionally, ap_vformatter allows for arbitrary output methods
+ * using the ap_vformatter_buff and flush_func.
+ *
+ * The ap_vformatter_buff has two elements curpos and endpos.
+ * curpos is where ap_vformatter will write the next byte of output.
+ * It proceeds writing output to curpos, and updating curpos, until
+ * either the end of output is reached, or curpos == endpos (i.e. the
+ * buffer is full).
+ *
+ * If the end of output is reached, ap_vformatter returns the
+ * number of bytes written.
+ *
+ * When the buffer is full, the flush_func is called. The flush_func
+ * can return -1 to indicate that no further output should be attempted,
+ * and ap_vformatter will return immediately with -1. Otherwise
+ * the flush_func should flush the buffer in whatever manner is
+ * appropriate, re-initialize curpos and endpos, and return 0.
+ *
+ * Note that flush_func is only invoked as a result of attempting to
+ * write another byte at curpos when curpos >= endpos. So for
+ * example, it's possible when the output exactly matches the buffer
+ * space available that curpos == endpos will be true when
+ * ap_vformatter returns.
+ *
+ * ap_vformatter does not call out to any other code, it is entirely
+ * self-contained. This allows the callers to do things which are
+ * otherwise "unsafe". For example, ap_psprintf uses the "scratch"
+ * space at the unallocated end of a block, and doesn't actually
+ * complete the allocation until ap_vformatter returns. ap_psprintf
+ * would be completely broken if ap_vformatter were to call anything
+ * that used a pool. Similarly http_bprintf() uses the "scratch"
+ * space at the end of its output buffer, and doesn't actually note
+ * that the space is in use until it either has to flush the buffer
+ * or until ap_vformatter returns.
+ */
+
+typedef struct {
+ char *curpos;
+ char *endpos;
+} ap_vformatter_buff;
+
+API_EXPORT(int) ap_vformatter(int (*flush_func)(ap_vformatter_buff *),
+ ap_vformatter_buff *, const char *fmt, va_list ap);
+
+/* These are snprintf implementations based on ap_vformatter().
+ *
+ * Note that various standards and implementations disagree on the return
+ * value of snprintf, and side-effects due to %n in the formatting string.
+ * ap_snprintf behaves as follows:
+ *
+ * Process the format string until the entire string is exhausted, or
+ * the buffer fills. If the buffer fills then stop processing immediately
+ * (so no further %n arguments are processed), and return the buffer
+ * length. In all cases the buffer is NUL terminated. The return value
+ * is the number of characters placed in the buffer, excluding the
+ * terminating NUL. All this implies that, at most, (len-1) characters
+ * will be copied over; if the return value is >= len, then truncation
+ * occured.
+ *
+ * In no event does ap_snprintf return a negative number.
+ */
+API_EXPORT_NONSTD(int) ap_snprintf(char *buf, size_t len, const char *format,...)
+ __attribute__((format(printf,3,4)));
+API_EXPORT(int) ap_vsnprintf(char *buf, size_t len, const char *format,
+ va_list ap);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !APACHE_AP_SNPRINTF_H */