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

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)getlesson.c        4.2     (Berkeley)      4/26/83";
        !             3: #endif not lint
        !             4: 
        !             5: #include "stdio.h"
        !             6: #include "lrnref.h"
        !             7: 
        !             8: char *
        !             9: getlesson()
        !            10: {
        !            11:        register char *p;
        !            12:        char ans[80], line[200];
        !            13:        int isnum, found, fd[2];
        !            14:        FILE *fp;
        !            15: 
        !            16:        sprintf(ans, "%s/%s/L%s", direct, sname, level);
        !            17:        if (access(ans, 04) == 0)               /* there is a file */
        !            18:                return(level);
        !            19:        isnum = 1;
        !            20:        for (p=level; *p; p++)          /* accept:  (digit|dot)*anychar  */
        !            21:                if (*p != '.' && (*p < '0' || *p > '9') && *(p+1) != '\0')
        !            22:                        isnum = 0;
        !            23:        if (isnum) {
        !            24:                strcpy(line, level);
        !            25:                p = level;
        !            26:                while (*p != '.' && *p >= '0' && *p <= '9')
        !            27:                        p++;
        !            28:                *p = '\0';
        !            29:                strcat(level, ".1a");
        !            30:                sprintf(ans, "%s/%s/L%s", direct, sname, level);
        !            31:                if (access(ans, 04) == 0) {     /* there is a file */
        !            32:                        printf("There is no lesson %s; trying lesson %s instead.\n\n", line, level);
        !            33:                        return(level);
        !            34:                }
        !            35:                printf("There is no lesson %s.\n", line);
        !            36:                return(0);
        !            37:        }
        !            38:        /* fgrep through lessons for one containing the string in 'level' */
        !            39:        pipe(fd);
        !            40:        if (fork() == 0) {
        !            41:                close(fd[0]);
        !            42:                dup2(fd[1], 1);
        !            43:                sprintf(ans,"cd %s/%s ; fgrep '%s' L?.* L??.* L???.*", direct, sname, level);
        !            44:                execl("/bin/csh", "csh", "-cf", ans, 0);
        !            45:                perror("/bin/csh");
        !            46:                fprintf(stderr, "Getlesson:  can't do %s\n", ans);
        !            47:        }
        !            48:        close(fd[1]);
        !            49:        fp = fdopen(fd[0], "r");
        !            50:        found = 0;
        !            51:        while (fgets(line, 200, fp) != NULL) {
        !            52:                for (p=line; *p != ':'; p++) ;
        !            53:                p++;
        !            54:                if (*p == '#')
        !            55:                        continue;
        !            56:                else {
        !            57:                        found = 1;
        !            58:                        break;
        !            59:                }
        !            60:        }
        !            61:        /*fclose(fp);*/
        !            62:        if (found) {
        !            63:                *--p = '\0';
        !            64:                strcpy(level, &line[1]);
        !            65:                sprintf(ans, "%s/%s/L%s", direct, sname, level);
        !            66:                if (access(ans, 04) == 0) {     /* there is a file */
        !            67:                        printf("Trying lesson %s.\n\n", level);
        !            68:                        return(level);
        !            69:                }
        !            70:        }
        !            71:        printf("There is no lesson containing \"%s\".\n", level);
        !            72:        return(0);
        !            73: }

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