C语言对字符串进行转义excape操作
/** *@brief 对于url中的一些特殊字符会被转义以利传输, * 并且, 归档服务器上, php写入cookie中的值可能存在特殊字符, 需要转换 * *参考: http://www.blooberry.com/indexdot/html/topics/urlencoding.htm * http://www.december.com/html/spec/esccodes.html * *@param[in,out] data 需要处理的数据, 处理完后, 这个数据会被修改为期待的数据 *@param[in] data_len data中的实际数据长度 * */ int escape_url_character(char *data, int data_len) { /* 下面只列出来了一些加密用到的字符, 而没有列出所有的字符, 主要是空格, /, +, = */ char *transfer_table[][2] = { {"+", "2B"}, {"[","5B"},{"]","5D"},{"`","60"},{";","3B"},{"/","2F"},{"?","3F"},{":","3A"},{"@","40"},{"=","3D"},{"&","26"},{"$","24"},{" ","20"},{"<","3C"},{">","3E"},{"#","23"},{"%","25"},{"{","7B"},{"}","7D"},{"|","7C"},{"\\","5C"},{"^","5E"},{"~","7E"}, {NULL, NULL} }; int i = 0, j; char *buf = calloc(data_len + 1, sizeof(char)); while( i < data_len ){ if( '%' != data[i]){ strncat(buf, data+i, 1); i++; continue; } /* 查表 */ j = 0; while( NULL != transfer_table[j][1] ){ if( 0 == strncasecmp(data+i+1, transfer_table[j][1], 2 )){ strncat(buf, transfer_table[j][0], 1); i += 3; break; } j++; } /* 对于表中不存在的字符不作处理, 但输出一条日志 */ if( NULL == transfer_table[j][1] ){ strncat(buf, data+i, 1); printf("escape_url_character: unhandled sequence: %s\n", data+i); i++; } } memset(data, 0, data_len); strcpy(data, buf); free(buf); return 0; }