/* Last edited on 2024-12-25 10:17:50 by stolfi */
/* Repeat a string endlessly */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include <pour_doc.h>

static char* usage = "pour [-c STRING | -n NUM]";

void error(char *msg);
int main(int ARGC, char *ARGV[]);

int main(int argc, char *argv[])
  {
    char buf[2] = "?";
    char *string = buf;
    int i = 1;
    while (i < argc)
      { if ((i+1 < argc) && (strcmp(argv[i],"-c")==0))
          { string = argv[i+1];
            if (strlen(string)==0){ error("cannot pour an empty string"); }
            i += 2;
          }
        else if ((i+1 < argc) && (strcmp(argv[i],"-n")==0))
          { long v = atol(argv[i+1]);
            if ((v < 0)||(v > 255)){ error("byte value out of range"); }
            buf[0] = (v < 128 ? v : v - 256);
            buf[1] = '\0';
            string = buf;
            i += 2;
          }
        else
          { error("unrecognized option"); }
      }
    char *p = string;
    while(1){
      putchar(*p); p++;
      if (*p == '\0') p = string;
    }
  }

void error(char *msg)
  {  fprintf(stderr, "%s\n", msg);
     fprintf(stderr, "usage: %s\n", usage);
     exit(1); }