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/********************************************
memory.c
copyright 2009-2023,2024 Thomas E. Dickey
copyright 1991-1992,1993 Michael D. Brennan
This is a source file for mawk, an implementation of
the AWK programming language.
Mawk is distributed without warranty under the terms of
the GNU General Public License, version 2, 1991.
********************************************/
/*
* $MawkId: memory.c,v 1.10 2024/08/25 17:15:43 tom Exp $
*/
#define Visible_STRING
#include <mawk.h>
#include <memory.h>
STRING null_str =
{0, 1, ""};
static STRING *
xnew_STRING(size_t len)
{
STRING *sval = (STRING *) zmalloc(len + STRING_OH);
sval->len = len;
sval->ref_cnt = 1;
return sval;
}
/* allocate space for a STRING */
STRING *
new_STRING0(size_t len)
{
if (len == 0) {
null_str.ref_cnt++;
return &null_str;
} else {
STRING *sval = xnew_STRING(len);
sval->str[len] = 0;
return sval;
}
}
/*
* Create a new string which may contain embedded nulls.
*/
STRING *
new_STRING1(const char *s, size_t len)
{
if (len == 0) {
null_str.ref_cnt++;
return &null_str;
} else {
STRING *sval = xnew_STRING(len);
memcpy(sval->str, s, len);
sval->str[len] = 0;
return sval;
}
}
/* convert char* to STRING* */
STRING *
new_STRING(const char *s)
{
if (s[0] == 0) {
null_str.ref_cnt++;
return &null_str;
} else {
STRING *sval = xnew_STRING(strlen(s));
strcpy(sval->str, s);
return sval;
}
}
#ifdef DEBUG
void
DB_free_STRING(STRING * sval)
{
if (--sval->ref_cnt == 0 &&
sval != &null_str) {
zfree(sval, sval->len + STRING_OH);
}
}
#endif
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