Thread: program hangs after execution

This program will generate a list of temporary filenames using linked lists.I dont get an error when I compile, but when I execute it just hangs. This is my code:

Code:

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

#ifdef NODEISSTRING
#define NODEDATATYPE(var) char var [20]
#else
#define NODEDATATYPE(var) int var 
#endif

struct node {
	NODEDATATYPE(data);
	struct node	*next;
};

void insertlist(struct node **list, NODEDATATYPE(val)){

	struct node *new, *cur, *back;
	int	found;

	new = malloc(sizeof(struct node));
	if ( new == NULL){
		fprintf(stderr, "Cannot allocate new.\n");
		exit(1);
	}

/* pick correct comparison based on data type */
#ifdef NODEISSTRING
        strcpy(new -> data, val);
#else
        new -> data = val;
#endif
	back = NULL;
	cur = *list;
	found = 0;
	while ( cur != NULL && !found ) 

/* pick the right comparison based on whether we are a string */
#ifdef NODEISSTRING
                if ( strcmp(val, cur -> data) <= 0 )
#else
                if ( val <= cur -> data )
#endif
			found = 1;
		else {
			back = cur;
			cur = cur -> next;
		}
	new -> next = cur;
	if ( back == NULL ) /* must be first element */
		*list = new;
	else
		back->next = new;
}

void deletelist(struct node **list) {

	struct node *n;

	n = (*list) -> next;

	if ( n == NULL )
		(*list) -> next = NULL;
	else
		/* copy whole struct */
		**list = *n;

	free(n);
}

struct node *searchlist(struct node *list, NODEDATATYPE(val)) {

	struct node *cur;
	int found;

	cur = list;
	found = 0;

	while ( cur != NULL && !found ) {

#ifdef NODEISSTRING
		if ( strcmp(cur -> data, val ) == 0 )
#else
		if ( cur -> data == val )
#endif
			found = 1;
		else
			cur = cur -> next;
	}

	return cur;

}

int emptylist(struct node *list){
	return (list == NULL);
}

void dumplist(struct node *list) {
	struct node *p;

	p = list;
	while ( p != NULL ) {

#ifdef NODEISSTRING
		printf("%s\n", p -> data);
#else
		printf("%d\n", p -> data);
#endif
		p = p -> next;
	}
}

void clearlist(struct node **list) {
	struct node *p, *c;

	p = *list;
	while ( p != NULL ) {
		c = p;
		p = p -> next;
		free(c);
	}
	*list = NULL;
}

int main () {

	struct node *list, *p;
	FILE *out;
	int x;

	out = fopen("d6.out", "w");			/* Opening file d6.out for writing */
 	
 	if(out == NULL) {						/* File test for out */
          perror("fopen:     d6.out");
          exit(1);
     }
     
     for(x = 0; x < 15000; x++)
          insertlist(&list, tmpnam(NULL));
          
     p = list;
	
	while ( p != NULL ) {

		fprintf(out, "%s\n", p -> data);
		fprintf(out, "%d\n", p -> data);
		p = p -> next;
	}
	
	clearlist(&list);
	fclose(out);
	return 0;
}

Have to use tmpnam.

Did what you said and no luck.

Briefly, without looking at the code have you thought of using a debugger and stepping through your code. This will show you where it is hanging.

Just a thought.