Whenever using eina we need to include it: 
 In our main function we declare (and initialize) some variables and initialize eina: 
 
{
   char *names = "Calvin;Leoben;D'anna;Simon;Doral;Six;Daniel;Sharon";
   char *str;
   char *tmp;
   char *prologue;
   char *part1 = "The Cylons were created by man. They evolved. They rebelled.";
   char *part2 = "There are many copies. And they have a plan.";
   char **arr;
   int i;
   char *time_arr;
   time_t curr_time;
   struct tm *info;
 
int eina_init(void)
Initializes the Eina library.
Definition: eina_main.c:279
#define EINA_UNUSED
Used to indicate that a function parameter is purposely unused.
Definition: eina_types.h:339
 It's frequently necessary to split a string into its constituent parts, eina_str_split() make's it easy to do so: 
 
   for (i = 0; arr[i]; i++)
     printf("%s\n", arr[i]);
char ** eina_str_split(const char *str, const char *delim, int max_tokens)
Splits a string using a delimiter.
Definition: eina_str.c:452
 Another common need is to make a string uppercase or lowercase, so let's create a string and make it uppercase and then make it lowercase again: 
 
   free(arr[0]);
   free(arr);
 
   str = malloc(sizeof(char) * 4);
   strcpy(str, "bsd");
 
   printf("%s\n", str);
void eina_str_toupper(char **str)
Uppercases all the characters in range [a-z] in the given string.
Definition: eina_str.c:709
   printf("%s\n", str);
void eina_str_tolower(char **str)
Lowercases all the characters in range [A-Z] in the given string.
Definition: eina_str.c:698
 Next we use eina to check if our names string starts or ends with some values: 
 
      printf("Starts with 'Calvin'\n");
      printf("Ends with 'sharon'\n");
      printf("Has extension 'sharon'\n");
Eina_Bool eina_str_has_extension(const char *str, const char *ext)
Checks if the given string has the given extension.
Definition: eina_str.c:436
Eina_Bool eina_str_has_suffix(const char *str, const char *suffix)
Checks if the given string has the given suffix.
Definition: eina_str.c:430
Eina_Bool eina_str_has_prefix(const char *str, const char *prefix)
Checks if the given string has the given prefix.
Definition: eina_str.c:416
 When strings will be used in a terminal (or a number of other places) it necessary to escape certain characters that appear in them: 
 
   printf("%s\n", tmp);
char * eina_str_escape(const char *str)
Escapes slashes, spaces and apostrophes in strings.
Definition: eina_str.c:648
 Much as we previously split a string we will now join two strings: 
   free(tmp);
 
   prologue = malloc(sizeof(char) * 106);
   printf("%s\n", prologue);
size_t eina_str_join_len(char *dst, size_t size, char sep, const char *a, size_t a_len, const char *b, size_t b_len)
Joins two strings of known length.
Definition: eina_str.c:458
 With strlcpy() we can copy what portion of the prologue fits in str and be sure that it's still NULL terminated: 
 
   printf("%s\n", str);
size_t eina_strlcpy(char *dst, const char *src, size_t siz)
Copies a c-string to another.
Definition: eina_str.c:317
 Since we are done with prologue and str we should free them: 
 
   free(prologue);
   free(str);
 Finally we see strlcat in action: 
 
   str = malloc(sizeof(char) * 14);
   sprintf(str, "%s", "cylons+");
   printf("%s\n", str);
size_t eina_strlcat(char *dst, const char *src, size_t siz)
Appends a c-string.
Definition: eina_str.c:349
 And then shut eina down and exit: 
   free(str);
 
   curr_time = time(NULL);
   info = localtime(&curr_time);
   printf("Today's Date: %s\n", time_arr);
   free(time_arr);
 
 
   return 0;
}
int eina_shutdown(void)
Shuts down the Eina library.
Definition: eina_main.c:350
char * eina_strftime(const char *format, const struct tm *tm)
Creates and update the buffer based on strftime output.
Definition: eina_str.c:383