78 lines
1.4 KiB
C
78 lines
1.4 KiB
C
#include <ctype.h> /* isdigit(3) */
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#include <errno.h> /* errno */
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#include <stdio.h> /* fprintf(3), stderr, NULL */
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#include <stdlib.h> /* srand(3), strtol(3) */
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#include <time.h> /* time(3) */
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#if !defined EX_SOFTWARE || !defined EX_USAGE
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# include <sysexits.h>
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#endif
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static char *program_name = "roll";
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int main(int argc, char *argv[]){
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char *argv0;
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char *argvc;
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char *ep;
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int r; /* rolls */
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int s; /* sides */
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argv0 = argv[0];
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if(argc < 2){
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fprintf(stderr,
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"Usage: %s [dice...]\n"
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"\tDice should be formatted [rolls]d[sides],"
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" e.g. 1d3, 5d6...\n",
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argv0 == NULL ? program_name : argv0
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);
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return EX_USAGE;
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}
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srand(time(NULL));
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while(--argc > 0){
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argvc = *++argv;
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/* Parse out [rolls]d[sides] */
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if(**argv >= 0x80 || !isdigit(**argv))
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goto error;
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errno = 0;
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r = strtol(*argv, &ep, 10);
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if(errno != 0)
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goto range;
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if(*(*argv = ep) != 'd'
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|| **argv >= 0x80
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|| !isdigit(*(++*argv)))
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goto error;
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s = strtol(*argv, &ep, 10);
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if(errno != 0)
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goto range;
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if(*ep != '\0')
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goto error;
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while(r --> 0)
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fprintf(stdout, "%d\n", rand() % s + 1);
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}
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return EX_OK;
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error: fprintf(stderr,
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"%s: %s: Improperly formatted die"
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" (should be [rolls]d[sides]).\n",
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argv0, argvc
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);
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return EX_USAGE;
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range: fprintf(stderr,
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"%s: %s: Number out of working range for this program.\n",
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argv0, argvc
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);
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return EX_SOFTWARE;
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}
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