248 lines
7.9 KiB
C
248 lines
7.9 KiB
C
#include "getcfg.h"
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#include "string.h"
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typedef char PARAMBUF[MAX_LEN_BYTES_OF_LINE+1];
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/*
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return first visible char pointer from a string.
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*/
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#ifndef MIN
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#define MIN(a,b) a<b?a:b
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#endif
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#if 0
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char pLine[MAX_LEN_BYTES_OF_LINE+1], pOneSectionName[MAX_LEN_BYTES_OF_LINE+1];//？？为什么要加1
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int i,j,nIsMatch;
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char *pLineHead = NULL, *pValueHead = NULL,
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*pSectionNameHead = NULL, *pSectionTail = NULL, *pEquelMark = NULL;//等号=
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char QuotationMark;//引号[]
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unsigned long nRetIndex, dwRet = R_USE_DEFAULT;
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#endif
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ConfigurationTokens g_DefaultConfigurationTokens = DEFAULT_CONFIG_TOKENS;
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static ConfigurationTokens g_ConfigurationTokens = DEFAULT_CONFIG_TOKENS;
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void SetConfigTokens( const ConfigurationTokens * pTokens )
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{
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g_ConfigurationTokens = *pTokens;
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}
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void SetConfigTokensDefault( ConfigurationTokens * pTokens )
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{
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*pTokens = g_DefaultConfigurationTokens;
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}
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char * FirstVisibleBYTE( char* pStr)
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{
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while( pStr )
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{
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switch( *pStr )
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{
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case '\t' : break;
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case ' ' : break;
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default : return pStr;
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}
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++pStr;
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}
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return NULL;
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}
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/******************************************************************************
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***ret : Return value
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***buffer : Source
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***line_token : Posible token of a line. token-标记
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***return : Position next search should be
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******************************************************************************/
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const char * ReadLnFromBuf(char *ret, int maxlen, const char *buffer, const char *line_token)
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{ //ReadLnFromBuf( pLine, MAX_LEN_BYTES_OF_LINE, pBuffer, g_ConfigurationTokens.LineEnd )
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char * sz;
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int i=0;
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sz = ret;
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for( i=0; (i<maxlen) && (*buffer); i++, sz++, buffer++ )
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{
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if( strchr( line_token, *buffer )) /* The char is a token 查找line_token出现在buffer中的位置*/
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{
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for(;strchr( line_token, *buffer );buffer++);/* Skip tocken char */
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break;
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}
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else
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*sz = *buffer;
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}
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*sz = '\0';
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return buffer;
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}
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/*****************************************************************************
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***GetConfiguration: Get configuration value from buffer
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***success: return 0
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***get failed, use default value: return R_USE_DEFAULT
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*****************************************************************************/
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/* ret = GetConfigFromBuf("local", //section名称
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"ip", //key
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"172.16.17.14",
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(char *)g_device_local_ip,
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sizeof(g_device_local_ip),
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(char *)config_buff*/
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unsigned long GetConfigFromBuf( const char *pSectionName, // section name
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const char *pKeyName, // key name
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const char *pDefault, // default string
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char *pReturnedString, // destination buffer
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unsigned long nSize, // size of destination buffer
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const char *pBuffer // Source configuration data buffer
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)
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{
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#if 1
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static char pLine[MAX_LEN_BYTES_OF_LINE+1], pOneSectionName[MAX_LEN_BYTES_OF_LINE+1];//？？为什么要加1
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int i,j,nIsMatch;
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char *pLineHead = NULL, *pValueHead = NULL,
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*pSectionNameHead = NULL, *pSectionTail = NULL, *pEquelMark = NULL;//等号=
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char QuotationMark;//引号[]
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unsigned long nRetIndex, dwRet = R_USE_DEFAULT;
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#endif
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memset( pLine, 0, MAX_LEN_BYTES_OF_LINE+1 );//将数组清0
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memset( pOneSectionName, 0, MAX_LEN_BYTES_OF_LINE+1 );
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memset( pReturnedString, 0, nSize );
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if( ( pSectionName ) && ( *pSectionName ) ) /*Want find section*/
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{
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while( pBuffer && (*pBuffer) )
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{//===1
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//取一行的数据
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pBuffer = ReadLnFromBuf( pLine, MAX_LEN_BYTES_OF_LINE, pBuffer, g_ConfigurationTokens.LineEnd );
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//一行数据的第一个字节
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pLineHead = FirstVisibleBYTE( pLine );
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//如果取出的一行数据的起始首字节是0
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if( !pLineHead )
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continue;//如果第一个字节为0则跳出单次循环 执行while判断
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//如果取出的一行数据的起始首字节是连接符“#”
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if( strchr( g_ConfigurationTokens.CommentLineBegin, *pLineHead ) )
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continue; /*Comment line*/
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//如果取出的一行数据的起始首字节不是起始符“[”
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if( !strchr( g_ConfigurationTokens.SectionBegin, *pLineHead ) )/* Not a section head*[]*/
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continue;
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//判断section是否为空，如果不为空返回section名称的首字节
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pSectionNameHead = FirstVisibleBYTE( pLineHead + 1 );/*Parse one section name*parse: 解析*/
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if( !pSectionNameHead )
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continue;
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i = 0;
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nIsMatch = 1;
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while( pSectionNameHead[i] && ( !strchr( g_ConfigurationTokens.SectionEnd, *pSectionTail) )
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&& pSectionName[i])
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{
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//判断提取的section名称是不是需要找的名称
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if( pSectionNameHead[i] != pSectionName[i] )
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{
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nIsMatch = 0;
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break;
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}
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i++;
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}
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//如果提取的section名称不是需要查找的名称
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if( !nIsMatch )
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continue;
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//判断输入section名称最后一个字符后面是不是空，即确定已经将提取出的section名称
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//和输入的指定section名称做了完整的比较
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if( pSectionName[i] != '\0' ) /*Not full match*/
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continue;
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//判断末尾是不是“]”结尾
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pSectionTail = FirstVisibleBYTE( &pSectionNameHead[i] );//tail:尾巴
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if( ! pSectionTail )
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continue;
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if( !strchr( g_ConfigurationTokens.SectionEnd, *pSectionTail) ) /*This char is not section end char*/
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continue;
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else
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break;
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}//===1
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}
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while( pBuffer && (*pBuffer) ) /*Want find key*/
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{
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pBuffer = ReadLnFromBuf( pLine, MAX_LEN_BYTES_OF_LINE, pBuffer, g_ConfigurationTokens.LineEnd );
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pLineHead = FirstVisibleBYTE( pLine );
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if( !pLineHead ) continue;
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if( strchr( g_ConfigurationTokens.CommentLineBegin, *pLineHead ) ) continue; /*Comment line*/
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if( ( pSectionName ) && ( *pSectionName ) )
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if( strchr( g_ConfigurationTokens.SectionBegin, *pLineHead ) ) break; /* Next section */
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i=0;
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nIsMatch = 1;
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while( pLineHead[i] && pKeyName[i] )
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{
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if( pLineHead[i] != pKeyName[i] )
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{
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nIsMatch = 0;
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break;
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}
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i++;
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}
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if( !nIsMatch )
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continue;
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pEquelMark = FirstVisibleBYTE( &pLineHead[i] );
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if( !pEquelMark )
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continue;
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if( (*pEquelMark) != '=' ) /*Not full match key name*/
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continue;
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/*Key name found and founded char '='*/
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pValueHead = FirstVisibleBYTE( pEquelMark+1 ); /*Get value addr*/
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nRetIndex = 0;
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if( ! pValueHead ) /*Empty value*/
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{
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*pReturnedString = '\0';
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dwRet = 0;
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goto end;
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}
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if( pValueHead[0] == '\'' || pValueHead[0] == '\"' ) /* Format "****" or '****' */
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{
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QuotationMark = pValueHead[0];
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j = 1;
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while( pValueHead[j] && ( nRetIndex < nSize)
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&& ( pValueHead[j] != QuotationMark ) )
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{
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if( pValueHead[j] == '\\' )
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{
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switch( pValueHead[j+1] )
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{
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case '\'' :pReturnedString[nRetIndex] = '\'';break;
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case 't' :pReturnedString[nRetIndex] = '\t';break;
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case 'n' :pReturnedString[nRetIndex] = '\n';break;
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case 'r' :pReturnedString[nRetIndex] = '\r';break;
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case '\"' :pReturnedString[nRetIndex] = '\"';break;
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case '\\' :pReturnedString[nRetIndex] = '\\';break;
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case '\0' :pReturnedString[nRetIndex] = '\0';break;
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default :pReturnedString[nRetIndex] = pValueHead[j+1];break;
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}
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j+=2;nRetIndex++;
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}
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else
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{
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pReturnedString[nRetIndex] = pValueHead[j];
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j++; nRetIndex++;
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}
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}
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dwRet = 0;
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goto end;
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}
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else
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{
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strncpy( pReturnedString, pValueHead, nSize );//copy
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dwRet = 0;
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goto end;
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}
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}
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end:
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if( dwRet != 0 )
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if( pDefault )
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strncpy( pReturnedString, pDefault, nSize );//strncpy char * strncpy(char *s1,char *s2,size_t n);
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//将字符串s2中最多n个字符复制到字符数组s1中，返回指向s1的指针
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return dwRet;
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}
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