parsing an irc message into a struct

gistfile1.c

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

typedef struct {
  char* origin;
  char* command;
  char* parv[15];
  int parc;
} msg_t;

msg_t parse(char* str) {
  char* tmp;
  msg_t msg;
  int i;
  
  tmp = strsep(&str, " ");
  if (*tmp == ':') {
    msg.origin = tmp + 1;
    msg.command = strsep(&str, " ");
  } else
    msg.command = tmp;
  
  for(i = 0; *str != ':' && str != NULL;) {
    tmp = strsep(&str, " ");
    msg.parv[i++] = tmp;
    if (*str == ':')
      msg.parv[i++] = str + 1;
  }
  
  msg.parc = i;
  
  return msg;
}

void showoff(char* str) {
  msg_t msg;
  int i;
  
  msg = parse(strdup(str));
  
  printf("origin: %s\n", msg.origin);
  printf("command: %s\n", msg.command);
  printf("parc: %d\n", msg.parc);
  
  for(i = 0; i < msg.parc; i++)
    printf("parv[%d]: %s\n", i, msg.parv[i]);
  printf("\n");
}

int main() {
  showoff(":xiphias PRIVMSG #malkier :Rock and Roll McDonalds");
  showoff(":andrew KICK #malkier xiphias :shut up");
  
  return 0;
}