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/* String descriptors, with out-of-memory checking.
Copyright (C) 2023 Free Software Foundation, Inc.
This file 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 of the License,
or (at your option) any later version.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#define GL_XSTRING_DESC_INLINE _GL_EXTERN_INLINE
#include "xstring-desc.h"
#include "ialloc.h"
string_desc_t
xstring_desc_concat (idx_t n, string_desc_t string1, ...)
{
if (n <= 0)
/* Invalid argument. */
abort ();
idx_t total = 0;
total += string1._nbytes;
if (n > 1)
{
va_list other_strings;
idx_t i;
va_start (other_strings, string1);
for (i = n - 1; i > 0; i--)
{
string_desc_t arg = va_arg (other_strings, string_desc_t);
total += arg._nbytes;
}
va_end (other_strings);
}
char *combined = (char *) imalloc (total);
if (combined == NULL)
xalloc_die ();
idx_t pos = 0;
memcpy (combined, string1._data, string1._nbytes);
pos += string1._nbytes;
if (n > 1)
{
va_list other_strings;
idx_t i;
va_start (other_strings, string1);
for (i = n - 1; i > 0; i--)
{
string_desc_t arg = va_arg (other_strings, string_desc_t);
if (arg._nbytes > 0)
memcpy (combined + pos, arg._data, arg._nbytes);
pos += arg._nbytes;
}
va_end (other_strings);
}
string_desc_t result;
result._nbytes = total;
result._data = combined;
return result;
}
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