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/* ----------------------------------------------------------------------- *
*
* Copyright 2008 H. Peter Anvin - All Rights Reserved
*
* This program 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, Inc., 51 Franklin St, Fifth Floor,
* Boston MA 02110-1301, USA; either version 2 of the License, or
* (at your option) any later version; incorporated herein by reference.
*
* ----------------------------------------------------------------------- */
/*
* refstr.c
*
* Simple reference-counted strings
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "refstr.h"
/* Allocate space for a refstring of len bytes, plus final null */
/* The final null is inserted in the string; the rest is uninitialized. */
char *refstr_alloc(size_t len)
{
char *r = malloc(sizeof(unsigned int)+len+1);
if (!r)
return NULL;
*(unsigned int *)r = 1;
r += sizeof(unsigned int);
r[len] = '\0';
return r;
}
const char *refstrndup(const char *str, size_t len)
{
char *r;
if (!str)
return NULL;
len = strnlen(str, len);
r = refstr_alloc(len);
if (r)
memcpy(r, str, len);
return r;
}
const char *refstrdup(const char *str)
{
char *r;
size_t len;
if (!str)
return NULL;
len = strlen(str);
r = refstr_alloc(len);
if (r)
memcpy(r, str, len);
return r;
}
int vrsprintf(const char **bufp, const char *fmt, va_list ap)
{
va_list ap1;
int len;
char *p;
va_copy(ap1, ap);
len = vsnprintf(NULL, 0, fmt, ap1);
va_end(ap1);
*bufp = p = refstr_alloc(len);
if ( !p )
return -1;
return vsnprintf(p, len+1, fmt, ap);
}
int rsprintf(const char **bufp, const char *fmt, ...)
{
int rv;
va_list ap;
va_start(ap, fmt);
rv = vrsprintf(bufp, fmt, ap);
va_end(ap);
return rv;
}
void refstr_put(const char *r)
{
unsigned int *ref;
if (r) {
ref = (unsigned int *)r - 1;
if (!--*ref)
free(ref);
}
}
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