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/* This file is part of GNU Rush.
Copyright (C) 2008-2024 Sergey Poznyakoff
GNU Rush is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Rush is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Rush. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <librush.h>
#include <xalloc.h>
struct line_list {
struct line_list *next;
size_t size;
char line[1];
};
struct slist {
struct line_list *head, *tail;
size_t size;
};
struct line_list *
new_line_seg(const char *p, size_t len)
{
struct line_list *lp = xmalloc(sizeof(*lp) + len);
lp->next = NULL;
if (p)
memcpy(lp->line, p, len);
lp->size = len;
return lp;
}
void
slist_append(slist_t slist, const char *p, size_t len)
{
struct line_list *lp = new_line_seg(p, len);
LIST_APPEND(lp, slist->head, slist->tail);
slist->size += len;
}
char *
slist_alloc(slist_t slist, size_t len)
{
struct line_list *lp = new_line_seg(NULL, len);
LIST_APPEND(lp, slist->head, slist->tail);
slist->size += len;
return lp->line;
}
char *
slist_reduce(slist_t slist, char **pbuf, size_t *psize)
{
struct line_list *lp;
size_t total = slist->size + 1;
size_t dummy;
char *s;
if (!psize) {
dummy = 0;
psize = &dummy;
*pbuf = NULL;
}
if (*psize < total) {
if (!*pbuf)
*pbuf = xmalloc(total);
else
*pbuf = xrealloc(*pbuf, total);
*psize = total;
}
s = *pbuf;
for (lp = slist->head; lp; ) {
struct line_list *next = lp->next;
memcpy(s, lp->line, lp->size);
s += lp->size;
free(lp);
lp = next;
}
*s++ = 0;
slist->head = slist->tail = NULL;
slist->size = 0;
return *pbuf;
}
slist_t
slist_create()
{
slist_t p = xzalloc(sizeof(*p));
return p;
}
void
slist_free(slist_t slist)
{
struct line_list *lp;
for (lp = slist->head; lp; ) {
struct line_list *next = lp->next;
free(lp);
lp = next;
}
free(slist);
}
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