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/**
* rolldice.c - v1.7 - 28 Mar 1999
* (c) Stevie Strickland, 1999
*
* This program has been placed under the GPL. Any bugfixes or enhancements
* will be greatly appreciated :)
*
* Stevie Strickland - sstrickl@resnet.gatech.edu
*/
#include "rolldice.h"
// File pointer for random device
static FILE* ran_dev;
void init_random(int rand_file) {
if(rand_file == RANDOM) {
if((ran_dev = fopen("/dev/random", "r")) == NULL) {
fprintf(stderr, "Error in opening /dev/random!\n");
exit(EXIT_FAILURE);
}
}
else if((ran_dev = fopen("/dev/urandom", "r")) == NULL) {
fprintf(stderr, "Error in opening /dev/urandom!\n");
exit(EXIT_FAILURE);
}
}
static int get_random(int sides) {
unsigned int ret_value;
if(!(fread(&ret_value, sizeof(unsigned int), 1, ran_dev) == 1)) {
printf("Error in reading random device!\n");
exit(EXIT_FAILURE);
}
return (int)(ret_value % sides);
}
/* rolldie() - Rolls a single die
*
* Parameters: int num_sides - number of sides of the die to roll
* Returns: int - the result of the roll
*/
int rolldie ( int num_sides ) {
return (1 + get_random(num_sides));
}
/* parse_string() - Parses a string for dice rolling attributes
*
* Parameters: char *dice_string - string to parse
* Returns: int * - array of nums describing the different aspects of the
* dice to be rolled
*/
int *parse_string(char *dice_string) {
int temp_int = -1, *dice_nums;
if((dice_nums = malloc ( DICE_ARRAY_SIZE * sizeof(int))) == NULL)
return NULL;
dice_nums[NUM_ROLLS] = 1;
dice_nums[NUM_DICE] = 1;
dice_nums[NUM_SIDES] = 6;
dice_nums[MULTIPLIER] = 1;
dice_nums[MODIFIER] = 0;
dice_nums[NUM_DROP] = 0;
while(*dice_string != '\0') {
if( isdigit(*dice_string) ) {
sscanf(dice_string, "%d", &temp_int);
while(isdigit(*(++dice_string)));
}
else {
switch(*dice_string) {
case 'd':
if(temp_int > 0 && temp_int < MAXSHORT)
dice_nums[NUM_DICE] = temp_int;
dice_string++;
if(*dice_string == '%')
dice_nums[NUM_SIDES] = 100;
else if( (sscanf(dice_string, "%d", &temp_int) < 1 ) ||
(temp_int < 2) || (temp_int >= MAXSHORT) ) {
free(dice_nums);
return NULL;
} else dice_nums[NUM_SIDES] = temp_int;
break;
case 's':
if( (sscanf(++dice_string, "%d", &temp_int) < 1) ||
(temp_int < 0) || (temp_int >= MAXSHORT)) {
free(dice_nums);
return NULL;
} else dice_nums[NUM_DROP] = temp_int;
break;
case 'x':
if( ( temp_int < 1 ) || (temp_int >= MAXSHORT) ) {
free(dice_nums);
return NULL;
} else dice_nums[NUM_ROLLS] = temp_int;
dice_string++;
break;
case '*':
if( (sscanf(++dice_string, "%d", &temp_int) < 1) ||
(temp_int < 0) || (temp_int >= MAXSHORT)) {
free(dice_nums);
return NULL;
} else dice_nums[MULTIPLIER] = temp_int;
break;
case '+':
if( (sscanf(++dice_string, "%d", &temp_int) < 1) ||
(temp_int < 0) || (temp_int >= MAXSHORT)) {
free(dice_nums);
return NULL;
} else dice_nums[MODIFIER] = temp_int;
break;
case '-':
if( (sscanf(++dice_string, "%d", &temp_int) < 1) ||
(temp_int < 0) || (temp_int >= MAXSHORT)) {
free(dice_nums);
return NULL;
} else dice_nums[MODIFIER] = -temp_int;
break;
default:
dice_string++;
break;
}
temp_int = 0;
}
}
return dice_nums;
}
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