#include <stdlib.h>
#include <string.h>
#include <gclib/gcstring.h>
#include <gclib/types.h>
#include <gclib/mem.h>
#include <gclib/strfuncs.h>

/*
 * Strings which manage their own memory
 */

String *string_new(const char *init)
{
    String *string=mem_new(String,1);
    if (!init)
	init="";
    string->len=strlen(init);
    string->alloc=string->len+1;
    string->str=str_dup(init);
    return string;
}

/*
 * Free a string and either return the contents (if free_segment is FALSE)
 * or free the contents as well and return NULL (if free_segment is TRUE).
 */
char *string_free(String *string,boolean free_segment)
{
    char *retval;
    if (free_segment)
    {
	mem_free(string->str);
	retval=NULL;
    }
    else
	retval=string->str;
    mem_free(string);
    return retval;
}

/*
 * Append a byte to string.
 */
void string_append_c(String *string,char c)
{
    if (string->len+1==string->alloc)
    {
	string->alloc*=2;
	string->str=mem_renew(char,string->str,string->alloc);
    }
    string->str[string->len++]=c;
    string->str[string->len]='\0';
}

/*
 * Append len bytes from s to string. len may be passed as <0 if s is
 * a nul-terminated string of unknown length.
 */
void string_append_len(String *string,const char *s,ssize_t len)
{
    if (len<0)
	len=strlen(s);
    if (string->len+len>=string->alloc)
    {
	while (string->len+len>=string->alloc)
	    string->alloc*=2;
	string->str=mem_renew(char,string->str,string->alloc);
    }
    memcpy(string->str+string->len,s,len);
    string->len+=len;
    string->str[string->len]='\0';
}

/*
 * Sets the length of a String. If the length is less than the current length,
 * the string will be truncated. If the length is greater than the current
 * length, the contents of the newly added area are undefined. (However, as
 * always, string->str[string->len] will be a nul byte.)
 */
void string_set_size(String *string,size_t len)
{
    if (len>=string->alloc)
    {
	while (len>=string->alloc)
	    string->alloc*=2;
	string->str=mem_renew(char,string->str,string->alloc);
    }
    string->len=len;
    string->str[string->len]='\0';
}