Strange things appear on running the program
- by FILIaS
Hey! I'm fixing a program but I'm facing a problem and I cant really realize what's the wrong on the code. I would appreciate any help.
I didnt post all the code...but i think with this part you can get an idea of it.
With the following function enter() I wanna add user commands' datas to a list.
eg. user give the command: "enter james bond 007 gun"
'james' is supposed to be the name, 'bond' the surname, 007 the amount and the rest is the description. I use strtok in order to 'cut' the command,then i put each name on a temp array. Then i call InsertSort in order to put the datas on a linked list but in alphabetical order depending on the surname that users give. I wanna keep the list on order and put each time the elements on the right position.
/* struct for all the datas that user enters on file*/
typedef struct catalog
{
char short_name[50];
char surname[50];
signed int amount;
char description[1000];
struct catalog *next;
}catalog,*catalogPointer;
catalogPointer current;
catalogPointer head = NULL;
void enter(void)//user command: enter <name> <surname> <amount> <description>
{ int n,j=2,k=0;
char temp[1500];
char command[1500];
while (command[j]!=' ' && command[j]!='\0')
{ temp[k]=command[j];
j++;
k++;
}
temp[k]='\0';
char *curToken = strtok(temp," ");
printf("temp is:%s \n",temp);
char short_name[50],surname[50],description[1000];
signed int amount;
//short_name=(char *)malloc(sizeof (char *));
//surname=(char *)malloc(sizeof (char *));
//description=(char *)malloc(sizeof (char *));
//amount=(int *)malloc(sizeof (int *));
printf("\nWhat you entered for saving:\n");
for (n = 0; curToken !='\0'; ++n)
{
if (curToken)
{
strncpy(short_name, curToken, sizeof (char *)); /
}
printf("Short Name: %s \n",short_name);
curToken = strtok(NULL," ");
if (curToken)
strncpy(surname, curToken, sizeof (char *)); /
printf("SurName: %s \n",surname);
curToken = strtok(NULL," ");
if (curToken)
{
char *chk;
amount = (int) strtol(curToken, &chk, 10);
if (!isspace(*chk) && *chk != 0)
fprintf(stderr,"Warning: expected integer value for amount, received %s instead\n",curToken);
}
printf("Amount: %d \n",amount);
curToken = strtok(NULL,"\0");
if (curToken)
{ strncpy(description, curToken, sizeof (char *));
}
printf("Description: %s \n",description);
break;
}
if (findEntryExists(head, surname) != NULL)
printf("\nAn entry for <%s %s> is already in the catalog!\nNew entry not entered.\n",short_name,surname);
else
{
printf("\nTry to entry <%s %s %d %s> in the catalog list!\n",short_name,surname,amount,description);
InsertSort(&head,short_name, surname, amount, description);
printf("\n**Entry done!**\n");
}
// Maintain the list in alphabetical order by surname.
}
/********Uses special case code for the head end********/
void SortedInsert(catalog** headRef, catalogPointer newNode,char short_name[],char surname[],signed int amount,char description[])
{
strcpy(newNode->short_name, short_name);
strcpy(newNode->surname, surname);
newNode->amount=amount;
strcpy(newNode->description, description);
// Special case for the head end
if (*headRef == NULL||(*headRef)->surname >= newNode->surname)
{ newNode->next = *headRef;
*headRef = newNode;
}
else
{ // Locate the node before the point of insertion
catalogPointer current = *headRef;
catalogPointer temp=current->next;
while ( temp!=NULL )
{
if(strcmp(temp->surname,newNode->surname)<0 )
current = temp;
}
newNode->next = temp;
temp = newNode;
}
}
// Given a list, change it to be in sorted order (using SortedInsert()).
void InsertSort(catalog** headRef,char short_name[],char surname[],signed int amount,char description[])
{
catalogPointer result = NULL; // build the answer here
catalogPointer current = *headRef; // iterate over the original list
catalogPointer next;
while (current!=NULL)
{
next = current->next; // tricky - note the next pointer before we change it
SortedInsert(&result,current,short_name,surname,amount,description);
current = next;
}
*headRef = result;
}
Running the program I get these strange things (garbage?)...
Choose your selection:
enter james bond 007 gun
Your command is: enter james bond 007 gun
temp is:james
What you entered for saving: Short
Name: james
SurName:
Amount: 0
Description: 0T??
Try to entry james 0 0T?? in the
catalog list!
Entry done!
Also I'm facing a problem on how to use the 'malloc' on this program.
Thanks in advance. . .
