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/* This file contains output buffer manipulation routines, which are called
by functions in versions of libplot that for one reason or another do
not support real-time output. Instead, graphics objects are stored in
an output buffer, which is written to the output stream when closepl()
is called. This is a kludge, which may eventually be replaced by an
in-core object hierarchy, which closepl() will scan. */
#include "sys-defines.h"
#include "plot.h"
#include "extern.h"
/* initial length for an output buffer, for holding output strings (should
be large enough to handle any single one of our sprintf's without
overflow). */
#define INITIAL_OUTBUF_LEN 256
void
#ifdef _HAVE_PROTOS
_initialize_buffer (Outbuffer *bufp)
#else
_initialize_buffer (bufp)
Outbuffer *bufp;
#endif
{
bufp->base = (char *)_plot_xmalloc(INITIAL_OUTBUF_LEN * sizeof(char));
bufp->len = INITIAL_OUTBUF_LEN;
bufp->current = bufp->base;
bufp->contents = 0;
}
/* UPDATE_BUFFER must be called after each sprintf() and other object write
operation */
void
#ifdef _HAVE_PROTOS
_update_buffer (Outbuffer *bufp)
#else
_update_buffer (bufp)
Outbuffer *bufp;
#endif
{
int additional;
additional = strlen (bufp->current);
bufp->current += additional;
bufp->contents += additional;
if (bufp->contents > bufp->len - 1) /* need room for NUL */
{
fprintf (stderr, "libplot: output buffer overrun\n");
exit (1);
}
if (bufp->contents > bufp->len / 2)
{
bufp->base =
(char *)_plot_xrealloc (bufp->base, 2 * bufp->len * sizeof(char));
bufp->len *= 2;
bufp->current = bufp->base + bufp->contents;
}
}
void
#ifdef _HAVE_PROTOS
_reset_buffer (Outbuffer *bufp)
#else
_reset_buffer (bufp)
Outbuffer *bufp;
#endif
{
bufp->current = bufp->base;
bufp->contents = 0;
}
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