| |
| /* |
| * Name: getNextCommandCode |
| * Input: FILE pointer |
| * Output: command code |
| * Return: GET_NEXT_COMMAND_CODE_SUCCESS, or |
| * GET_NEXT_COMMAND_CODE_IO_ERROR, |
| * GET_NEXT_COMMAND_CODE_INVALID_COMMAND |
| * Description: Reads next command code from file and returns the command |
| * value. The file input is assumed to be a DIS Benchmark |
| * Suite: Data Management data set file where each line of the |
| * file is a separate command to read. There are five valid |
| * values for the command code which correspond to the |
| * database commands (Insert, Query, Delete, and Init) and a |
| * NONE type which indicates that the data file is "empty", |
| * i.e., all of the commands in the file have been processed. |
| * A command code of NONE does not indicate an error condition |
| * which would be returned by an error flag. |
| * Calls: errorMessage() |
| * getInt() |
| * System: |
| * Author: M.L.Rivas |
| * |
| * Revision History: |
| * |
| * Date Name Revision |
| * ------- --------------- ------------------------------ |
| * 24May99 Matthew Rivas Created |
| * |
| * Copyright 1999, Atlantic Aerospace Electronics Corp. |
| */ |
| |
| #include <assert.h> /* for assert() */ |
| #include <stdio.h> /* for FILE definition */ |
| #include "dataManagement.h" /* for primitive data types */ |
| #include "errorMessage.h" /* for errorMessage() definition */ |
| #include "getNextCommandCode.h" /* for getNextCommandCode() return codes */ |
| #include "getInt.h" /* for getInt() and return code definitions */ |
| |
| Int getNextCommandCode( FILE *file, /* file for reading */ |
| CommandType *commandCode ) /* code of next command */ |
| { /* begin getNextCommandCode() */ |
| Int returnCode; |
| Int command; |
| |
| static Char name[] = "getNextCommandCode"; |
| |
| assert( file ); |
| assert( commandCode ); |
| |
| /* |
| * Read integer value from FILE and check for errors. If an early |
| * end-of-line or low-level getString failure occurred, return error |
| * code. If EOF is returned, assume that the file is done and return code |
| * of appropriate value. If valid command is read, place value in code |
| * and return success. If an unknown command is read, place INVALID value |
| * in command code, clear line of unknown data, and return error. |
| */ |
| returnCode = getInt( file, &command ); |
| if ( returnCode == GET_INT_SUCCESS ) { |
| if ( command == INIT ) { |
| *commandCode = INIT; |
| returnCode = GET_NEXT_COMMAND_CODE_SUCCESS; |
| } /* end of if ( command == INIT ) */ |
| else if ( command == INSERT ) { |
| *commandCode = INSERT; |
| returnCode = GET_NEXT_COMMAND_CODE_SUCCESS; |
| } /* end of if ( command == INSERT ) */ |
| else if ( command == QUERY ) { |
| *commandCode = QUERY; |
| returnCode = GET_NEXT_COMMAND_CODE_SUCCESS; |
| } /* end of if ( command == QUERY ) */ |
| else if ( command == DELETE ) { |
| *commandCode = DELETE; |
| returnCode = GET_NEXT_COMMAND_CODE_SUCCESS; |
| } /* end of if ( command == DELETE ) */ |
| else { |
| errorMessage( "unknown command code", REPLACE ); |
| errorMessage( name, PREPEND ); |
| *commandCode = INVALID; |
| returnCode = GET_NEXT_COMMAND_CODE_INVALID_COMMAND; |
| } /* end of command code branches */ |
| } /* end of if ( returnCode == GET_INT_SUCCESS ) */ |
| else if ( returnCode == GET_INT_EOI ) { |
| *commandCode = NONE; |
| returnCode = GET_NEXT_COMMAND_CODE_SUCCESS; |
| } /* end of if ( returnCode == GET_INT_EOI ) */ |
| else if ( returnCode == GET_INT_RANGE_EXCEEDED ) { |
| errorMessage( "unknown command code", REPLACE ); |
| errorMessage( name, PREPEND ); |
| *commandCode = INVALID; |
| returnCode = GET_NEXT_COMMAND_CODE_INVALID_COMMAND; |
| } /* end of if ( returnCode == GET_INT_EOF ) */ |
| else if ( returnCode == GET_INT_BAD_CONVERSION ) { |
| errorMessage( "improper format - code must be an integer", REPLACE ); |
| errorMessage( name, PREPEND ); |
| *commandCode = INVALID; |
| returnCode = GET_NEXT_COMMAND_CODE_INVALID_COMMAND; |
| } /* end of if ( returnCode == GET_INT_EOF ) */ |
| |
| return ( returnCode ); |
| } /* end of getNextCommandCode() */ |
