Groups.c

#include "groups.h"void setGroupList(struct chatgroup * xgrouplist) {  grouplist = xgrouplist;}struct chatgroup * getGroupList() {  return grouplist;}/*    Read groups from a stream */struct chatgroup * readgroups(int connection) {  long value = 0, tvalue = 0;  long groups = 0, tgroups = 0;  long c = 0;  char * gname, final;  short glen, tglen;  struct chatgroup * current = NULL, * tmpgroup = NULL;  recv(connection, &tvalue, sizeof(tvalue), 0);  value = ntohl(tvalue);  recv(connection, &tgroups, sizeof(tgroups), 0);  groups = ntohl(tgroups);  for(c=0;c<groups;c++) {    recv(connection, &tglen, sizeof(tglen), 0);    glen = ntohs(tglen);    gname = (char *) malloc(glen+1);    recv(connection, gname, glen, 0);    gname[glen]='\0';    printf("group \"%s\"\n", gname);    // Create group here [...]    tmpgroup = initgroup(gname);    current = insertgroup(current, tmpgroup);    free(gname);  }  recv(connection, &final, 1, 0);    return firstgroup(current);}/*    Create a group object */struct chatgroup * initgroup(char * name) {  struct chatgroup * tmpgroup = NULL;  if (name == NULL) {    return NULL;  };  tmpgroup = (struct chatgroup *) malloc(sizeof(struct chatgroup));  tmpgroup->prev = NULL;  tmpgroup->next = NULL;  tmpgroup->name = (char *) malloc(strlen(name) + 1);  strcpy(tmpgroup->name,name);  return tmpgroup;};void disposegroup(struct chatgroup * group) {  struct chatgroup * tmpprev = NULL;  struct chatgroup * tmpnext = NULL;  if (group == NULL) { return; };  tmpprev = group->prev;  tmpnext = group->next;  if (tmpprev) { tmpprev->next = tmpnext; };  if (tmpnext) { tmpnext->prev = tmpprev; };   if (group->name) { free(group->name); };  free(group);};void disposeallgroups(struct chatgroup * group) {  if (group) {    struct chatgroup * current = firstgroup(group);    while (current) {      struct chatgroup * next = current->next;      disposegroup(current);    }  }}struct chatgroup * insertgroup(struct chatgroup * before,                               struct chatgroup * newgroup) {  struct chatgroup * tmpprev = NULL;  struct chatgroup * tmpnext = NULL;  if (before == NULL) {    return newgroup;  }  tmpprev = before;  tmpnext = before->next;  before->next = newgroup;  newgroup->prev = before;  newgroup->next = tmpnext;  if (tmpnext) { tmpnext->prev = newgroup; };};struct chatgroup * firstgroup(struct chatgroup * group) {  if (group == NULL) { return NULL; };  while (group->prev != NULL) {    group = group->prev;  }  return group;};struct chatgroup * lastgroup(struct chatgroup * group) {  if (group == NULL) { return NULL; };  while (group->next != NULL) {    group = group->next;  }  return group;};