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Annotation of 42BSD/usr.bin/learn/selsub.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)selsub.c   4.2     (Berkeley)      4/25/83";
        !             3: #endif not lint
        !             4: 
        !             5: #include "stdio.h"
        !             6: #include "sys/types.h"
        !             7: #include "sys/stat.h"
        !             8: #include "lrnref.h"
        !             9: 
        !            10: selsub(argc,argv)
        !            11: char *argv[];
        !            12: {
        !            13:        char ans1[100];
        !            14:        static char ans2[30];
        !            15:        static char dirname[20];
        !            16:        static char subname[20];
        !            17:        struct stat statbuf;
        !            18: 
        !            19:        if (argc > 1 && argv[1][0] == '-') {
        !            20:                direct = argv[1]+1;
        !            21:                argc--;
        !            22:                argv++;
        !            23:        }
        !            24:        if (chdir(direct) != 0) {
        !            25:                perror(direct);
        !            26:                fprintf(stderr, "Selsub:  couldn't cd to non-standard directory\n");
        !            27:                exit(1);
        !            28:        }
        !            29:        sname = argc > 1 ? argv[1] : 0;
        !            30:        if (argc > 2) {
        !            31:                strcpy (level=ans2, argv[2]);
        !            32:                if (strcmp(level, "-") == 0)    /* no lesson name is - */
        !            33:                        ask = 1;
        !            34:                else
        !            35:                        again = 1;      /* treat as if "again lesson" */
        !            36:        }
        !            37:        else
        !            38:                level = 0;
        !            39:        if (argc > 3 )
        !            40:                speed = atoi(argv[3]);
        !            41:        if (!sname) {
        !            42:                printf("These are the available courses -\n");
        !            43:                list("Linfo");
        !            44:                printf("If you want more information about the courses,\n");
        !            45:                printf("or if you have never used 'learn' before,\n");
        !            46:                printf("press RETURN; otherwise type the name of\n");
        !            47:                printf("the course you want, followed by RETURN.\n");
        !            48:                fflush(stdout);
        !            49:                gets(sname=subname);
        !            50:                if (sname[0] == '\0') {
        !            51:                        list("Xinfo");
        !            52:                        do {
        !            53:                                printf("\nWhich subject?  ");
        !            54:                                fflush(stdout);
        !            55:                                gets(sname=subname);
        !            56:                        } while (sname[0] == '\0');
        !            57:                }
        !            58:        }
        !            59:        chknam(sname);
        !            60:        stat(sname, &statbuf);
        !            61:        total = statbuf.st_size / 16 - 2;       /* size/dirsize-(.+..) */
        !            62:        if (!level) {
        !            63:                printf("If you were in the middle of this subject\n");
        !            64:                printf("and want to start where you left off, type\n");
        !            65:                printf("the last lesson number the computer printed.\n");
        !            66:                printf("If you don't know the number, type in a word\n");
        !            67:                printf("you think might appear in the lesson you want,\n");
        !            68:                printf("and I will look for the first lesson containing it.\n");
        !            69:                printf("To start at the beginning, just hit RETURN.\n");
        !            70:                fflush(stdout);
        !            71:                gets(ans2);
        !            72:                if (ans2[0]==0)
        !            73:                        strcpy(ans2,"0");
        !            74:                level=ans2;
        !            75:        }
        !            76: 
        !            77:        /* make new directory for user to play in */
        !            78:        if (chdir("/tmp") != 0) {
        !            79:                perror("/tmp");
        !            80:                fprintf(stderr, "Selsub:  couldn't cd to public directory\n");
        !            81:                exit(1);
        !            82:        }
        !            83:        sprintf(dir=dirname, "pl%da", getpid());
        !            84:        sprintf(ans1, "mkdir %s", dir);
        !            85:        system(ans1);
        !            86:        if (chdir(dir) < 0) {
        !            87:                perror(dir);
        !            88:                fprintf(stderr, "Selsub:  couldn't make play directory with %s.\nBye.\n", ans1);
        !            89:                exit(1);
        !            90:        }
        !            91:        /* after this point, we have a working directory. */
        !            92:        /* have to call wrapup to clean up */
        !            93:        if (access(sprintf(ans1, "%s/%s/Init", direct, sname), 04)==0)
        !            94:                if (system(sprintf(ans1, "%s/%s/Init %s", direct, sname, level)) != 0) {
        !            95:                        printf("Leaving learn.\n");
        !            96:                        wrapup(1);
        !            97:                }
        !            98: }
        !            99: 
        !           100: chknam(name)
        !           101: char *name;
        !           102: {
        !           103:        if (access(name, 05) < 0) {
        !           104:                printf("Sorry, there is no subject or lesson named %s.\nBye.\n", name);
        !           105:                exit(1);
        !           106:        }
        !           107: }

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