Seite 7: Listing 3

Inhaltsverzeichnis

Listing 3: FileCompress.c – das Parsen der Kommandozeile

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int main(int argc, char *argv[]) {
    int        argCnt=1, lastOpt=0, fileNameListCount=0;
    char    *args, **fileNameList=NULL;
    bool    argFollows=false;

    if (argc > 1) {
        while (--argc) {
            args=argv[argCnt++];
            if (*args=='-' && strlen(args)>1) {
                int idx, length=strlen(args);
                bool isBreak=false;

                for (idx=1;idx<length;idx++) {
                    switch (lastOpt=args[idx]) {
                    case 'b': // blocksizeKB follows
                        if ((idx+1) < length) {
                            if ((blockSizeKB=
                                str2BlockSizeKB(&args[idx+1]))<0) usage();
                            isBreak=true;
                        } else {
                            argFollows=true;
                        }
                                break;
                    case 'd': // decompress
                        isDecompress=true; break;
                    case 'D': // debug
                        isDebug=true; break;
                    case 'f': // force overwriting
                        isForce=true; break;
                    case 'p': // password follows - implicitly sets 
                        the crypt flag
                        isCrypt=true;
                        if ((idx+1) < length) {
                            passwd=&args[idx+1]; isBreak=true;
                        } else argFollows=true;
                        break;
                    case 'r': // remove source file
                        isRemoveSource=true; break;
                    case 't': // test file
                        isTest=true; break;
                    case 'v': // sets the verbose flag
                        isVerbose=true;    break;
                    default: usage();    
                    }
                    if (argFollows || isBreak) break;
                }
                continue;
            }
            if (argFollows) {
                switch (lastOpt) {
                case 'b': if ((blockSizeKB=
                       str2BlockSizeKB(args))<0) usage();
                    break;
                case 'p': passwd=args; break;
                }
                argFollows=false; continue;
            }
            if (access(args, 0)==-1) {
                fprintf(stderr,"unable to access \"%s\"\n", args);
                exit(2);
            }
            fileNameList=realloc(fileNameList,(1+fileNameListCount)
                *sizeof(char *));
            fileNameList[fileNameListCount++]=args;
        }
    } else isStdIn=true;
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