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/*
Copyright (C) 2011- The University of Notre Dame
This software is distributed under the GNU General Public License.
See the file COPYING for details.
*/
#include "xxmalloc.h"
#include <assert.h>
#include <stddef.h>
#include <string.h>
/* Format:
<NULL terminated array of char *>
<size_t size of entire memory block>
<data>
*/
#define DEFAULT_SIZE (sizeof(char *) + sizeof(size_t))
char **string_array_new (void)
{
char **data = (char **) xxrealloc(NULL, DEFAULT_SIZE);
*data = NULL;
size_t *length = (size_t *) data+1;
*length = DEFAULT_SIZE;
return data;
}
char **string_array_append (char **oarray, const char *str)
{
char **narray, **tmp;
for (tmp = oarray; *tmp; tmp++) ;
tmp++; /* advance past NULL pointer */
size_t olength = *((size_t *) tmp);
size_t nlength = olength + strlen(str)+1 + sizeof(char *);
narray = xxrealloc(oarray, nlength);
ptrdiff_t offset = ((char *)narray)-((char *)oarray)+sizeof(char *); /* difference including extra pointer */
for (tmp = narray; *tmp; tmp++)
*tmp = ((char *)*tmp)+offset; /* correct the address */
*tmp = (char *) (((char *)narray)+olength+sizeof(char *)); /* set to new string location */
strcpy(*tmp, str);
tmp++; /* now points to the old data length */
memmove(((char *)tmp)+sizeof(char *), tmp, olength-(((char *)tmp)-((char *)narray))); /* careful with pointer arithmetic */
*tmp = NULL; /* set NULL terminated final entry */
tmp++;
*((size_t *) tmp) = nlength; /* set the new length */
return narray;
}
/* vim: set noexpandtab tabstop=4: */
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