externals/build/src prepend.c,1.3,1.4 - Pd-cvs

9 Aug 2006


      Update of /cvsroot/pure-data/externals/build/src
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv8956
Added Files:
    prepend.c 
Log Message:
adding back in file I deleted in haste.  This version of prepend is not very compatible tho...
--- NEW FILE: prepend.c ---
/* Copyright (c) 2002-2003 krzYszcz and others.
 * For information on usage and redistribution, and for a DISCLAIMER OF ALL
 * WARRANTIES, see the file, "LICENSE.txt," in this distribution.  */
#include <string.h>
#include "m_pd.h"
#define PREPEND_INISIZE   32  /* LATER rethink */
#define PREPEND_MAXSIZE  256
typedef struct _prepend
{
    t_object   x_ob;
    t_symbol  *x_selector;
    int        x_size;    /* as allocated */
    int        x_natoms;  /* as used */
    t_atom    *x_message;
    t_atom     x_messini[PREPEND_INISIZE];
    int        x_entered;
    int        x_auxsize;
    t_atom    *x_auxbuf;
} t_prepend;
static t_class *prepend_class;
void *grow_nodata(int *nrequested, int *sizep, void *bufp,
                  int inisize, void *bufini, size_t typesize);
void *grow_withtail(int *nrequested, int *nexisting, char **startp, 
                int *sizep, void *bufp,
                int inisize, void *bufini, size_t typesize);
void *grow_withdata(int *nrequested, int *nexisting,
                    int *sizep, void *bufp,
                    int inisize, void *bufini, size_t typesize);
/* Usually a preallocation method is used, except in special cases of:
   1) reentrant output request, or 2) an output request which would cause
   resizing to more than MAXSIZE (no such limit for a 'set' message).
   In both special cases, a temporary output buffer is allocated.
   A separately preallocated output buffer is not used, thus avoiding
   memcpying of the stored message (a small performance gain when the
   preallocation method is chosen).  Instead, self-invoked 'set'
   messages are postponed, using an auxiliary buffer.
*/
static void prepend_dooutput(t_prepend *x, t_symbol *s, int ac, t_atom *av)
{
    if (s == &s_float)
    {
    if (ac > 1)
        outlet_list(((t_object *)x)->ob_outlet, &s_list, ac, av);
    else
        outlet_float(((t_object *)x)->ob_outlet, av->a_w.w_float);
    }
    else if (s == &s_list)
    outlet_list(((t_object *)x)->ob_outlet, &s_list, ac, av);
    else if (s)
    /* CHECKED: 'bang' is prepended -- we cannot do so...
       ('symbol' cannot be compatible too) */
    {
    outlet_anything(((t_object *)x)->ob_outlet, s, ac, av);
    }
}
static void prepend_anything(t_prepend *x, t_symbol *s, int ac, t_atom *av)
{
    int reentered = x->x_entered;
    int prealloc = !reentered;
    int ntotal = x->x_natoms + ac;
    t_atom *buf;
    x->x_entered = 1;
    if (s == &s_) s = 0;
    if (s)
    ntotal++;
    if (prealloc && ntotal > x->x_size)
    {
    if (ntotal > PREPEND_MAXSIZE)
        prealloc = 0;
    else
    {
        int nrequested = ntotal;
        x->x_message = grow_withdata(&nrequested, &x->x_natoms,
    				 &x->x_size, x->x_message,
    				 PREPEND_INISIZE, x->x_messini,
    				 sizeof(*x->x_message));
        prealloc = (nrequested == ntotal);
    }
    }
    if (prealloc)
    {
    buf = x->x_message + x->x_natoms;
    if (s)
    {
        SETSYMBOL(buf, s);
        buf++;
    }
    if (ac)
        memcpy(buf, av, ac * sizeof(*buf));
    prepend_dooutput(x, x->x_selector, ntotal, x->x_message);
    }
    else
    {
    /* LATER consider using the stack if ntotal <= MAXSTACK */
    if (buf = getbytes(ntotal * sizeof(*buf)))
    {
        t_atom *bp = buf + x->x_natoms;
        if (x->x_natoms)
    	memcpy(buf, x->x_message, x->x_natoms * sizeof(*buf));
        if (s)
        {
    	SETSYMBOL(bp, s);
    	bp++;
        }
        if (ac)
    	memcpy(bp, av, ac * sizeof(*bp));
        prepend_dooutput(x, x->x_selector, ntotal, buf);
        freebytes(buf, ntotal * sizeof(*buf));
    }
    }
    if (!reentered)
    {
    x->x_entered = 0;
    if (x->x_auxbuf)
    {
        if (x->x_auxsize <= x->x_size)
        {
    	x->x_natoms = x->x_auxsize / 2;
    	memcpy(x->x_message, x->x_auxbuf,
    	       x->x_natoms * sizeof(*x->x_message));
    	freebytes(x->x_auxbuf, x->x_auxsize * sizeof(*x->x_auxbuf));
        }
        else
        {
    	if (x->x_message != x->x_messini)
    	    freebytes(x->x_message, x->x_size * sizeof(*x->x_message));
    	x->x_size = x->x_auxsize;
    	x->x_message = x->x_auxbuf;
    	x->x_natoms = x->x_auxsize / 2;
        }
        x->x_auxbuf = 0;
    }
    }
}
static void prepend_bang(t_prepend *x)
{
    t_atom at;
    SETSYMBOL(&at, &s_bang);  /* CHECKED */
    prepend_anything(x, 0, 1, &at);
}
static void prepend_float(t_prepend *x, t_float f)
{
    t_atom at;
    SETFLOAT(&at, f);
    prepend_anything(x, 0, 1, &at);
}
static void prepend_symbol(t_prepend *x, t_symbol *s)
{
    t_atom at;
    SETSYMBOL(&at, s);
    prepend_anything(x, 0, 1, &at);
}
/* LATER gpointer */
static void prepend_list(t_prepend *x, t_symbol *s, int ac, t_atom *av)
{
    prepend_anything(x, 0, ac, av);
}
static void prepend_set(t_prepend *x, t_symbol *s, int ac, t_atom *av)
{
    if (ac)
    {
    int newsize;
    if (av->a_type == A_FLOAT)
    {
        if (ac > 1) x->x_selector = &s_list;
        else x->x_selector = &s_float;
    }
    else if (av->a_type == A_SYMBOL)
    {
        x->x_selector = av->a_w.w_symbol;
        ac--;
        av++;
    }
    else
        return;  /* LATER rethink */
    newsize = ac * 2;
    if (x->x_entered)
    {
        if (x->x_auxbuf)
        {
    	freebytes(x->x_auxbuf, x->x_auxsize * sizeof(*x->x_auxbuf));
    	x->x_auxsize = 0;
        }
        if (x->x_auxbuf = getbytes(newsize * sizeof(*x->x_auxbuf)))
        {
    	memcpy(x->x_auxbuf, av, ac * sizeof(*x->x_auxbuf));
    	x->x_auxsize = newsize;
        }
    }
    else
    {
        t_atom *ap;
        if (newsize > x->x_size)
        {
    	int sz = newsize;
    	x->x_message = grow_nodata(&sz, &x->x_size, x->x_message,
    				   PREPEND_INISIZE, x->x_messini,
    				   sizeof(*x->x_message));
    	if (sz != newsize)
    	    ac = sz / 2;  /* LATER rethink */
        }
        x->x_natoms = ac;
        ap = x->x_message;
        while (ac--) *ap++ = *av++;
    }
    }
}
static void prepend_free(t_prepend *x)
{
    if (x->x_message != x->x_messini)
    freebytes(x->x_message, x->x_size * sizeof(*x->x_message));
}
static void *prepend_new(t_symbol *s, int ac, t_atom *av)
{
    t_prepend *x = (t_prepend *)pd_new(prepend_class);
    x->x_selector = 0;
    x->x_size = PREPEND_INISIZE;
    x->x_natoms = 0;
    x->x_message = x->x_messini;
    x->x_auxbuf = 0;
    x->x_entered = 0;
    outlet_new((t_object *)x, &s_anything);
    prepend_set(x, 0, ac, av);
    return (x);
}
void prepend_setup(void)
{
    prepend_class = class_new(gensym("prepend"),
    		      (t_newmethod)prepend_new,
    		      (t_method)prepend_free,
    		      sizeof(t_prepend), 0,
    		      A_GIMME, 0);
    class_addbang(prepend_class, prepend_bang);
    class_addfloat(prepend_class, prepend_float);
    class_addsymbol(prepend_class, prepend_symbol);
    class_addlist(prepend_class, prepend_list);
    class_addanything(prepend_class, prepend_anything);
    class_addmethod(prepend_class, (t_method)prepend_set,
    	    gensym("set"), A_GIMME, 0);
}
/* Prior to this call a caller is supposed to check for *nrequested > *sizep.
   Returns a reallocated buffer's pointer (success) or a given 'bufini'
   default value (failure).
   Upon return *nrequested contains the actual number of elements:
   requested (success) or a given default value of 'inisize' (failure). */
void *grow_nodata(int *nrequested, int *sizep, void *bufp,
    	  int inisize, void *bufini, size_t typesize)
{
    int newsize = *sizep * 2;
    while (newsize < *nrequested) newsize *= 2;
    if (bufp == bufini)
    bufp = getbytes(newsize * typesize);
    else
    bufp = resizebytes(bufp, *sizep * typesize, newsize * typesize);
    if (bufp)
    {
    *sizep = newsize;
    return (bufp);
    }
    else
    {
    *nrequested = *sizep = inisize;
    return (bufini);
    }
}
/* Like grow_nodata(), but preserving first *nexisting elements. */
void *grow_withdata(int *nrequested, int *nexisting,
    	    int *sizep, void *bufp,
    	    int inisize, void *bufini, size_t typesize)
{
    int newsize = *sizep * 2;
    while (newsize < *nrequested) newsize *= 2;
    if (bufp == bufini)
    {
    if (!(bufp = getbytes(newsize * typesize)))
    {
        *nrequested = *sizep = inisize;
        return (bufini);
    }
    *sizep = newsize;
    memcpy(bufp, bufini, *nexisting * typesize);
    }
    else
    {
    int oldsize = *sizep;
    if (!(bufp = resizebytes(bufp, *sizep * typesize, newsize * typesize)))
    {
        *nrequested = *sizep = inisize;
        *nexisting = 0;
        return (bufini);
    }
    *sizep = newsize;
    }
    return (bufp);
}
/* Like grow_nodata(), but preserving a 'tail' of *nexisting elements,
   starting from *startp. */
/* LATER rethink handling of a start pointer (clumsy now) */
void *grow_withtail(int *nrequested, int *nexisting, char **startp,
    	    int *sizep, void *bufp,
    	    int inisize, void *bufini, size_t typesize)
{
    int newsize = *sizep * 2;
    while (newsize < *nrequested) newsize *= 2;
    if (bufp == bufini)
    {
    char *oldstart = *startp;
    if (!(bufp = getbytes(newsize * typesize)))
    {
        *nrequested = *sizep = inisize;
        return (bufini);
    }
    *startp = (char *)bufp + (newsize - *nexisting) * typesize;
    *sizep = newsize;
    memcpy(*startp, oldstart, *nexisting * typesize);
    }
    else
    {
    int oldsize = *sizep;
    if (!(bufp = resizebytes(bufp, *sizep * typesize, newsize * typesize)))
    {
        *startp = (char *)bufini + inisize * typesize;
        *nrequested = *sizep = inisize;
        *nexisting = 0;
        return (bufini);
    }
    *startp = (char *)bufp + (newsize - *nexisting) * typesize;
    *sizep = newsize;
    memmove(*startp, (char *)bufp + (oldsize - *nexisting) * typesize,
    	*nexisting * typesize);
    }
    return (bufp);
}