roll.c

/* Roll.c - A simplified recreation of telehack.com's roll */
/* Michael J. Chappell */

#define VERSION      "0.6 5 October 2024"
#define VERSION_YEAR 2024

/* For reference rolls 2 die, or n die for "roll n", 
   Usage is: roll [n]|[/?]|[-?][/V][/v]
   will accept only one argument,
   checks for invalid characters in options,
   options start with '-' or '/',
   if legal option is not '?' it is ignored,
   0<=n<=10, no output on 0, just blank lines, 
   error is "%bad number of dice", 
   lines are prefaced with CR
*/

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include <time.h>
#include "screen.h"
#include "roll.h"

#if defined(__FreeBSD__)
#define sranddev() srandomdev()
#endif

#if defined(__NetBSD__)||defined(__linux__)
#define sranddev() srand((int)time(NULL))
#endif

int die[10] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
    
int printDieLine(int r, int line) {
    int i, j;

    switch (line) {
        case 0:
            fputs(TOPLINE, stdout);
            break;
        case 1:
        case 2:
        case 3:
            fputs(LEDGE, stdout);
            for (i=0; i<3; i++) fputs(matrix[r][line-1][i] ? FILL : EMPTY, stdout);
            fputs(REDGE, stdout);
            break;
        case 4:
            fputs(BOTTOMLINE, stdout);
            break;
        case 5:
            fprintf(stdout, "     %d    ", r);
            break;
        }
    return EXIT_SUCCESS;
}

/* getNum 

   returns 0 to MAXDIES ROLL_ERR_RANGE, ROLL_ERR_PARAM or ROLL_ERR_HELP
   based on the contents of the commandline.
*/
int getNum(int count, char **value) {
    int n=0;
    int i=0;
    int option=0;  /* Boolean indicates option passed */
    int flagged=0; /* Boolean indicator for invalid characters */

    /* allow for only 0 or 1 parameters */

    if (count==1) return DEFAULT_NUM_DICE;
    if (count>2) return ROLL_ERR_PARAM;
    
    /* 
       Checks option for '?' and 'H' for help,
       also checks for 'V' for version.
       Throws away other valid option strings,
       Valid options consist of characters in {0-9,A-Z,a-z}.
     */
    if ((value[1][0]=='-')||(value[1][0]=='/')) option=1;
    if (option) {
      flagged=0;
      i=1;
      if (value[1][1]=='\0') flagged=1; /* no option after flag */
      while (value[1][i]!='\0') {
	if (!isalnum(value[1][i++])) /* invalid char after flag */
	  flagged=1;
      }
    } else {
      flagged=0;
      i=0;
      while (value[1][i]!='\0') {
	if (!isdigit(value[1][i++]))
	  flagged=1;
      } 
    }

    if (strcmp(value[1],"-H")==0) return ROLL_ERR_HELP;
    if (strcmp(value[1],"-h")==0) return ROLL_ERR_HELP;
    if (strcmp(value[1],"/H")==0) return ROLL_ERR_HELP;
    if (strcmp(value[1],"/h")==0) return ROLL_ERR_HELP;
    if (strcmp(value[1],"-?")==0) return ROLL_ERR_HELP;
    if (strcmp(value[1],"/?")==0) return ROLL_ERR_HELP;
    if (strcmp(value[1],"-V")==0) return ROLL_ERR_VERSION;
    if (strcmp(value[1],"-v")==0) return ROLL_ERR_VERSION;
    if (strcmp(value[1],"/V")==0) return ROLL_ERR_VERSION;
    if (strcmp(value[1],"/v")==0) return ROLL_ERR_VERSION;
    
    n = atoi(value[1]);
    if (n>MAXDIES) return ROLL_ERR_RANGE;
    /* since we allow for negative, we need test for the negative out
       of range too */
    if ((n<0) && (n<MAXDIES*-1)) return ROLL_ERR_RANGE;
    
    if (flagged) return ROLL_ERR_PARAM;
    if (option && !n) return ROLL_ERR_HELP;
        
    return n;
} /* getNum */

int version(char *command, char *versionstring, int year) {
    printf("\n%s %s", command, versionstring);
    printf("\nCopyright %d Michael J. Chappell\n", year);
    
    return EXIT_SUCCESS;
}

int main(int argc, char **argv) {
    int line=0;
    int roll=0;
    int n=0;
    int i=0;
    int toss=0;

    for (i=0; i<10; i++ ) die[i] = i%6+1;

    n = getNum(argc, argv);

    /* handle errors */
    switch (n) {
    case ROLL_ERR_HELP:
        printf("\n%s %s",argv[0], VERSION);
        printf("\nUsage:\n\t%s [-][N][/v][/?]\n",argv[0]);
        printf("\nOptions can be designated with \'/\' or \'-\' in upper or");
        printf("\nlower-case. N should be 1-10 inclusive.  Default is 2.\n");
        printf("\nCopyright %d Michael J. Chappell\n", VERSION_YEAR);
        return EXIT_SUCCESS;
	break;
    case ROLL_ERR_PARAM:
        fputs(BAD_NUMBER_PARAM, stderr);
        return EXIT_FAILURE;
	break;
    case ROLL_ERR_RANGE:
        fputs(BAD_NUMBER_DICE, stderr);
        return EXIT_FAILURE;
	break;
    case ROLL_ERR_VERSION:
        version(argv[0],VERSION, VERSION_YEAR);
        return EXIT_SUCCESS;
	break;
    }
    
    /* If n is positive seed rand, otherwise skip seeding, make n positive */
    if (n>0) {
      sranddev();
    } else {
      n=n*-1;
    }
    
    for (toss=0; toss<NUM_THROWS; toss++) {
        for (i=0; i<n; i++)
            die[i]=rand()%6+1;
        screen_clear();
        for (line=0; line<6; line++) {
            putc('\n', stdout);
            for (i=0; i<n; i++)
                printDieLine(die[i], line);
        }
    }
    fputc('\n', stdout);
    
    return EXIT_SUCCESS;
}
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Friday, 18 July 2025 Michael J. Chappell Contact me at: mcsuper5@freeshell.org
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