added fz's [freadln] and [fwriteln]

svn path=/trunk/externals/zexy/; revision=7703

1 files changed, 221 insertions, 0 deletions

diff --git a/src/freadln.c b/src/freadln.c
new file mode 100644
index 0000000..fea9181
--- /dev/null
+++ b/src/freadln.c
@@ -0,0 +1,221 @@
+
+/******************************************************
+ *
+ * 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"
+
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <fcntl.h>
+
+#ifdef __WIN32__
+# include <io.h>
+#else
+# include <sys/types.h>
+# 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;
+} 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;
+   int fd;
+   freadln_close(x);
+
+   if(type!=gensym("cr")) {
+     pd_error(x, "currently only 'cr' type files are implemented!");
+     return;
+   }
+
+   // directory, filename, extension, dirresult, nameresult, unsigned int size, int bin
+   if ((fd=open_via_path("",s->s_name,"", filenamebuf, &filenamebufptr, MAXPDSTRING,0))==-1) {
+      pd_error(x, "failed to open %128s", filenamebuf);
+      close(fd);
+      return;
+   }
+   close(fd);
+   if (!(x->x_file=fopen(filenamebuf, "r"))) {
+      pd_error(x, "failed to open %128s",filenamebuf);
+      return;
+   }
+   if (!(x->x_filename=(char*)getbytes(sizeof(char)*strlen(filenamebuf)))) {
+      pd_error(x, "out of memory");
+      freadln_close(x);
+      return;
+   }
+   strcpy(x->x_filename,filenamebuf);
+   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 ret_pos=0;
+   t_binbuf *bbuf;
+   t_atom *abuf;
+   int abuf_length;
+   t_symbol *s;
+
+   if (!x->x_file) {
+      pd_error(x, "no file opened for reading");
+      return;
+   }
+
+   do {
+      if (ret_pos==-1) {
+	 min_length++;
+	 fseek(x->x_file,-(long)(x->x_textbuf_length-1),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 (!(fgets(x->x_textbuf, x->x_textbuf_length, x->x_file))) {
+         freadln_close(x);
+         outlet_bang(x->x_readybang_outlet);
+         return;
+      }
+   } while ((ret_pos=cstr_char_pos(x->x_textbuf,'\n'))==-1);
+   x->x_textbuf[ret_pos-1]='\0';
+   //post("analyzing \"%s\"",x->x_textbuf);
+   if (!(bbuf=binbuf_new())) {
+      pd_error(x, "out of memory");
+      freadln_close(x);
+      return;
+   }
+   binbuf_text(bbuf, x->x_textbuf, ret_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;
+   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);
+}
+