utlist 下載地址：https://github.com/troydhanson/uthash

#include <stdio.h>

include <stdlib.h>
include <string.h>
include "utlist.h"
define BUFLEN 20
typedef struct el {
    char bname[BUFLEN];
    struct el next, prev;
} el;
int namecmp(el a, el b) {
    return strcmp(a->bname,b->bname);
}
el head = NULL; / important- initialize to NULL! */
int main(int argc, char argv[]) {
    el name, elt, tmp, etmp;

char linebuf[BUFLEN];
int count;
FILE *file;

if ( (file = fopen( "test11.dat", "r" )) == NULL ) {
    perror("can't open: ");
    exit(-1);
}

while (fgets(linebuf,BUFLEN,file) != NULL) {
    if ( (name = (el*)malloc(sizeof(el))) == NULL) exit(-1);
    strncpy(name->bname,linebuf,BUFLEN);
    DL_APPEND(head, name);
}
DL_SORT(head, namecmp);
DL_FOREACH(head,elt) printf("%s", elt->bname);
DL_COUNT(head, elt, count);
printf("%d number of elements in list\n", count);

memcpy(&etmp.bname, "WES\n", 5);
DL_SEARCH(head,elt,&etmp,namecmp);
if (elt) printf("found %s\n", elt->bname);

/* now delete each element, use the safe iterator */
DL_FOREACH_SAFE(head,elt,tmp) {
  DL_DELETE(head,elt);
}

fclose(file);

return 0;

}</pre>