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/******************************************************
*
* zexy - implementation file
*
* copyleft (c) Franz Zotter
*
* 2105:forum::für::umläute:2007
*
* institute of electronic music and acoustics (iem)
*
******************************************************
*
* license: GNU General Public License v.2
*
******************************************************/
#include "zexy.h"
#ifdef __WIN32__
# define snprintf _snprintf
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef __WIN32__
# include <io.h>
#else
# include <unistd.h>
#endif
#define MIN_FREADLN_LENGTH 10
/* freadln: reads messages continuously from the lines of
* a file that doesn't necessarily need to fit
* into the RAM of your system
*
* Franz Zotter zotter@iem.at, 2007
* Institute of Electronic Music and Acoustics
*
*/
static t_class *freadln_class;
typedef struct freadln
{
t_object x_ob;
FILE *x_file;
char *x_filename;
char *x_textbuf;
int x_textbuf_length;
t_outlet *x_message_outlet;
t_outlet *x_readybang_outlet;
char linebreak_chr[3];
t_canvas *x_canvas;
} t_freadln;
static void freadln_close (t_freadln *x)
{
if(x->x_file)
fclose(x->x_file);
x->x_file=0;
if(x->x_filename)
freebytes(x->x_filename, sizeof(char)*MAXPDSTRING);
x->x_filename=0;
if(x->x_textbuf)
freebytes(x->x_textbuf, sizeof(char)*x->x_textbuf_length);
x->x_textbuf=0;
x->x_textbuf_length=0;
}
static void freadln_open (t_freadln *x, t_symbol *s, t_symbol*type)
{
char filenamebuf[MAXPDSTRING], *filenamebufptr;
char*dirname=canvas_getdir(x->x_canvas)->s_name;
int fd, len;
freadln_close(x);
/*
if(type!=gensym("cr")) {
pd_error(x, "currently only 'cr' type files are implemented!");
return;
}
*/
if (type==gensym("cr"))
strcpy(x->linebreak_chr,"\n");
else
strcpy(x->linebreak_chr,";\n");
/* directory, filename, extension, dirresult, nameresult, unsigned int size, int bin */
if ((fd=open_via_path(dirname,
s->s_name,"", filenamebuf, &filenamebufptr, MAXPDSTRING,0)) < 0 ) {
pd_error(x, "%s: failed to open %s", s->s_name, filenamebuf);
return;
}
close(fd);
len=strlen(filenamebuf);
if (!(x->x_filename=(char*)getbytes(sizeof(char)*(len+strlen(s->s_name)+2)))) {
pd_error(x, "out of memory");
freadln_close(x);
return;
}
strcpy(x->x_filename,filenamebuf);
strcpy(x->x_filename+len,"/");
strcpy(x->x_filename+len+1,s->s_name);
if (!(x->x_file=fopen(x->x_filename, "r"))) {
pd_error("freadln: failed to open %128s",filenamebuf);
return;
}
if (!(x->x_textbuf = (char *) getbytes (MIN_FREADLN_LENGTH * sizeof(char)))) {
pd_error(x, "out of memory");
freadln_close(x);
return;
}
x->x_textbuf_length=MIN_FREADLN_LENGTH;
}
static int enlarge_cstr_if_required(const char **c_str, int *len, const int desired_min_length)
{
if ((!(*c_str))||*len==0) {
*c_str = (char*) calloc (1,sizeof(char));
return 1;
}
if (len[0]<desired_min_length) {
do {
len[0]<<=1;
} while ((len[0]<desired_min_length)&&(len[0]!=0));
freebytes((char*)*c_str, sizeof(char)*len[0]);
if (!(*c_str=(char*)calloc(len[0],sizeof(char))))
len[0]=0;
}
return len[0];
}
static int cstr_char_pos(const char *c_str, const char c)
{
int cnt=1;
if (c_str) {
do {
if (*c_str==c)
return cnt;
cnt++;
} while (*c_str++!='\0');
}
return -1;
}
static void freadln_readline (t_freadln *x)
{
int min_length=(x->x_textbuf_length < 1)?1:x->x_textbuf_length;
int linebreak_pos=0;
int items_read;
t_binbuf *bbuf;
t_atom *abuf;
int abuf_length;
int rewind_after;
if (!x->x_file) {
pd_error(x, "no file opened for reading");
return;
}
do {
if (linebreak_pos==-1) {
min_length<<=1;
fseek(x->x_file,-(long)(x->x_textbuf_length),SEEK_CUR);
}
if (!enlarge_cstr_if_required((const char**) &x->x_textbuf, &x->x_textbuf_length, min_length)) {
pd_error(x, "out of memory");
x->x_textbuf_length=0;
freadln_close(x);
return;
}
if (!(items_read=fread(x->x_textbuf,sizeof(char),x->x_textbuf_length,x->x_file))) {
freadln_close(x);
outlet_bang(x->x_readybang_outlet);
return;
}
x->x_textbuf[x->x_textbuf_length-1]=0;
} while (((linebreak_pos=cstr_char_pos(x->x_textbuf,x->linebreak_chr[0]))==-1) &&
!(items_read < x->x_textbuf_length));
if (linebreak_pos-1 < items_read - strlen(x->linebreak_chr)) {
rewind_after=items_read-linebreak_pos;
fseek(x->x_file,-(long)(rewind_after),SEEK_CUR);
}
if (linebreak_pos==-1)
linebreak_pos=items_read;
x->x_textbuf[linebreak_pos-1]='\0';
if (!(bbuf=binbuf_new())) {
pd_error(x, "out of memory");
freadln_close(x);
return;
}
binbuf_text(bbuf, x->x_textbuf, linebreak_pos-1);
abuf = binbuf_getvec(bbuf);
abuf_length = binbuf_getnatom(bbuf);
if (abuf_length>0) {
if (abuf->a_type==A_SYMBOL) {
outlet_anything(x->x_message_outlet, atom_getsymbol(abuf), abuf_length-1, abuf+1);
}
else {
outlet_list(x->x_message_outlet, gensym("list"), abuf_length, abuf);
}
}
else {
outlet_list(x->x_message_outlet, atom_getsymbol(abuf), 0, abuf);
}
/* NOTE: the following line might be a problem in recursions
* and could be performed before to outlet_* as well,
* but(!) atom buffer abuf must be copied if doing so.
*/
binbuf_free(bbuf);
}
static void freadln_free (t_freadln *x)
{
freadln_close(x);
outlet_free (x->x_message_outlet);
outlet_free (x->x_readybang_outlet);
}
static void *freadln_new(void)
{
t_freadln *x = (t_freadln *)pd_new(freadln_class);
x->x_message_outlet = outlet_new(&x->x_ob, &s_list);
x->x_readybang_outlet = outlet_new(&x->x_ob, &s_bang);
x->x_filename=0;
x->x_file=0;
x->x_textbuf=0;
x->x_canvas = canvas_getcurrent();
return (void *)x;
}
void freadln_setup(void)
{
freadln_class = class_new(gensym("freadln"), (t_newmethod)freadln_new,
(t_method) freadln_free, sizeof(t_freadln), 0, 0);
class_addmethod(freadln_class, (t_method)freadln_open, gensym("open"), A_SYMBOL, A_DEFSYM, 0);
class_addmethod(freadln_class, (t_method)freadln_close, gensym("close"), A_NULL, 0);
class_addbang(freadln_class, (t_method)freadln_readline);
zexy_register("freadln");
}
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