📄 log.c
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/* * Embedded HTTP Server Compressed Log Utilities * * ./software/ch7/emhttps/log.c * * mtj@cogitollc.com * */#include <unistd.h>#include "log.h"#include "emhttp.h"#define HI_PRIORITY 0x80#define MED_PRIORITY 0x40#define LOW_PRIORITY 0x00#define LOG_TYPE_MASK 0x3f#define HUNTING_PREFIX_HEADER 0#define EMIT_STRING 1#define EMIT_ARGUMENT 2#define HUNTING_SUFFIX_HEADER 3struct logConstStruct { unsigned char id; char *string;} logStrings[] = { { (NORMAL_REQUEST | LOW_PRIORITY), "Received request for ^.<P>" }, { (UNKNOWN_FILE | LOW_PRIORITY), "Request for unknown file ^.<P>" }, { (POST_REQUEST | LOW_PRIORITY), "Post request for file ^.<P>" }};#define MAX_LOG 1024static unsigned char log[MAX_LOG];static int curWrite = 0;/*---------------------------------------------------------------------------- * emitByte() - Emit a single byte to the log *--------------------------------------------------------------------------*/void emitByte(unsigned char byte){ log[curWrite++] = byte; if (curWrite == MAX_LOG) curWrite = 0;}/*---------------------------------------------------------------------------- * emitString() - Emit a string (with null char) to the log *--------------------------------------------------------------------------*/void emitString(char *string){ int i, len = strlen(string)+1; for (i = 0 ; i < len ; i++) emitByte(string[i]);}/*---------------------------------------------------------------------------- * sendLog() - Emit the current log through the connected HTTP client socket. *--------------------------------------------------------------------------*/void sendLog(int fd){ int count = MAX_LOG; int i = curWrite; int state = HUNTING_PREFIX_HEADER; unsigned char curByte; char *logLine; extern void returnFileHeader(int, int); unsigned char getByte(int *, int *); unsigned char peekByte(int *); const char *HTML_HDR1={"<HTML><HEAD><TITLE>Log</TITLE></HEAD>"}; const char *HTML_HDR2={"<BODY><H3>"}; const char *HTML_HDR3={"</H3></BODY></HTML>\n"}; /* First, make sure we're on a valid header. */ i = curWrite; while (count > 0) { if (peekByte(&i) == PREFIX_BYTE) break; (void)getByte(&i, &count); } /* Emit log header info in HTML format */ returnFileHeader(fd, TEXT_HTML); write(fd, HTML_HDR1, strlen(HTML_HDR1)); write(fd, HTML_HDR2, strlen(HTML_HDR2)); while (count > 0) { if (state == HUNTING_PREFIX_HEADER) { if (getByte(&i, &count) == PREFIX_BYTE) { curByte = getByte(&i, &count); logLine = logStrings[(curByte & LOG_TYPE_MASK)].string; state = EMIT_STRING; write(fd, "\n", 1); } else break; } else if (state == EMIT_STRING) { curByte = *logLine++; if (curByte == 0) state = HUNTING_SUFFIX_HEADER; else if (curByte == '^') state = EMIT_ARGUMENT; else write(fd, &curByte, 1); } else if (state == EMIT_ARGUMENT) { curByte = getByte(&i, &count); if (curByte == 0) state = EMIT_STRING; else write(fd, &curByte, 1); } else if (state == HUNTING_SUFFIX_HEADER) { if (getByte(&i, &count) == SUFFIX_BYTE) state = HUNTING_PREFIX_HEADER; else break; } } write(fd, HTML_HDR3, strlen(HTML_HDR3));}/*---------------------------------------------------------------------------- * getByte() - Read a byte from the log (with autoincrement of read index) *--------------------------------------------------------------------------*/unsigned char getByte(int *index, int *count){ (*count)--; if (*index == MAX_LOG) *index = 0; return(log[(*index)++]);}/*---------------------------------------------------------------------------- * peekByte() - Peek at a byte at the current read index *--------------------------------------------------------------------------*/unsigned char peekByte(int *index){ if (*index == MAX_LOG) return(log[0]); else return(log[*index]);}/* * Copyright (c) 2002 Charles River Media. All rights reserved. * * Redistribution and use in source and binary forms, with or * without modification, is hereby granted without fee provided * that the following conditions are met: * * 1. Redistributions of source code must retain the above * copyright notice, this list of conditions and the * following disclaimer. * 2. Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the * following disclaimer in the documentation and/or other * materials provided with the distribution. * 3. Neither the name of Charles River Media nor the names of * its contributors may be used to endorse or promote products * derived from this software without specific prior * written permission. * * THIS SOFTWARE IS PROVIDED BY CHARLES RIVER MEDIA AND CONTRIBUTERS * 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CHARLES * RIVER MEDIA OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARAY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */⌨️ 快捷键说明
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