diff -r d59bea55db9b -r c445c931472f src/glpsdf.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/glpsdf.c	Mon Dec 06 13:09:21 2010 +0100
@@ -0,0 +1,262 @@
+/* glpsdf.c (plain data file reading routines) */
+
+/***********************************************************************
+*  This code is part of GLPK (GNU Linear Programming Kit).
+*
+*  Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008,
+*  2009, 2010 Andrew Makhorin, Department for Applied Informatics,
+*  Moscow Aviation Institute, Moscow, Russia. All rights reserved.
+*  E-mail: <mao@gnu.org>.
+*
+*  GLPK 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, either version 3 of the License, or
+*  (at your option) any later version.
+*
+*  GLPK is distributed in the hope that it will be useful, but WITHOUT
+*  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+*  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+*  License for more details.
+*
+*  You should have received a copy of the GNU General Public License
+*  along with GLPK. If not, see <http://www.gnu.org/licenses/>.
+***********************************************************************/
+
+#define GLPSDF_H
+
+#define GLP_DATA_DEFINED
+typedef struct glp_data glp_data;
+
+#include "glpapi.h"
+
+struct glp_data
+{     /* plain data file */
+      char *fname;
+      /* name of data file */
+      XFILE *fp;
+      /* stream assigned to data file */
+      void *jump; /* jmp_buf jump; */
+      /* label for go to in case of error */
+      int count;
+      /* line count */
+      int c;
+      /* current character of XEOF */
+      char item[255+1];
+      /* current data item */
+};
+
+static void next_char(glp_data *data);
+
+glp_data *glp_sdf_open_file(const char *fname)
+{     /* open plain data file */
+      glp_data *data = NULL;
+      XFILE *fp;
+      jmp_buf jump;
+      fp = xfopen(fname, "r");
+      if (fp == NULL)
+      {  xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
+         goto done;
+      }
+      data = xmalloc(sizeof(glp_data));
+      data->fname = xmalloc(strlen(fname)+1);
+      strcpy(data->fname, fname);
+      data->fp = fp;
+      data->jump = NULL;
+      data->count = 0;
+      data->c = '\n';
+      data->item[0] = '\0';
+      /* read the very first character */
+      if (setjmp(jump))
+      {  glp_sdf_close_file(data);
+         data = NULL;
+         goto done;
+      }
+      data->jump = jump;
+      next_char(data);
+      data->jump = NULL;
+done: return data;
+}
+
+void glp_sdf_set_jump(glp_data *data, void *jump)
+{     /* set up error handling */
+      data->jump = jump;
+      return;
+}
+
+void glp_sdf_error(glp_data *data, const char *fmt, ...)
+{     /* print error message */
+      va_list arg;
+      xprintf("%s:%d: ", data->fname, data->count);
+      va_start(arg, fmt);
+      xvprintf(fmt, arg);
+      va_end(arg);
+      if (data->jump == NULL)
+         xerror("");
+      else
+         longjmp(data->jump, 1);
+      /* no return */
+}
+
+void glp_sdf_warning(glp_data *data, const char *fmt, ...)
+{     /* print warning message */
+      va_list arg;
+      xprintf("%s:%d: warning: ", data->fname, data->count);
+      va_start(arg, fmt);
+      xvprintf(fmt, arg);
+      va_end(arg);
+      return;
+}
+
+static void next_char(glp_data *data)
+{     /* read next character */
+      int c;
+      if (data->c == XEOF)
+         glp_sdf_error(data, "unexpected end of file\n");
+      else if (data->c == '\n')
+         data->count++;
+      c = xfgetc(data->fp);
+      if (c < 0)
+      {  if (xferror(data->fp))
+            glp_sdf_error(data, "read error - %s\n", xerrmsg());
+         else if (data->c == '\n')
+            c = XEOF;
+         else
+         {  glp_sdf_warning(data, "missing final end of line\n");
+            c = '\n';
+         }
+      }
+      else if (c == '\n')
+         ;
+      else if (isspace(c))
+         c = ' ';
+      else if (iscntrl(c))
+         glp_sdf_error(data, "invalid control character 0x%02X\n", c);
+      data->c = c;
+      return;
+}
+
+static void skip_pad(glp_data *data)
+{     /* skip uninteresting characters and comments */
+loop: while (data->c == ' ' || data->c == '\n')
+         next_char(data);
+      if (data->c == '/')
+      {  next_char(data);
+         if (data->c != '*')
+            glp_sdf_error(data, "invalid use of slash\n");
+         next_char(data);
+         for (;;)
+         {  if (data->c == '*')
+            {  next_char(data);
+               if (data->c == '/')
+               {  next_char(data);
+                  break;
+               }
+            }
+            next_char(data);
+         }
+         goto loop;
+      }
+      return;
+}
+
+static void next_item(glp_data *data)
+{     /* read next item */
+      int len;
+      skip_pad(data);
+      len = 0;
+      while (!(data->c == ' ' || data->c == '\n'))
+      {  data->item[len++] = (char)data->c;
+         if (len == sizeof(data->item))
+            glp_sdf_error(data, "data item `%.31s...' too long\n",
+               data->item);
+         next_char(data);
+      }
+      data->item[len] = '\0';
+      return;
+}
+
+int glp_sdf_read_int(glp_data *data)
+{     /* read integer number */
+      int x;
+      next_item(data);
+      switch (str2int(data->item, &x))
+      {  case 0:
+            break;
+         case 1:
+            glp_sdf_error(data, "integer `%s' out of range\n",
+               data->item);
+         case 2:
+            glp_sdf_error(data, "cannot convert `%s' to integer\n",
+               data->item);
+         default:
+            xassert(data != data);
+      }
+      return x;
+}
+
+double glp_sdf_read_num(glp_data *data)
+{     /* read floating-point number */
+      double x;
+      next_item(data);
+      switch (str2num(data->item, &x))
+      {  case 0:
+            break;
+         case 1:
+            glp_sdf_error(data, "number `%s' out of range\n",
+               data->item);
+         case 2:
+            glp_sdf_error(data, "cannot convert `%s' to number\n",
+               data->item);
+         default:
+            xassert(data != data);
+      }
+      return x;
+}
+
+const char *glp_sdf_read_item(glp_data *data)
+{     /* read data item */
+      next_item(data);
+      return data->item;
+}
+
+const char *glp_sdf_read_text(glp_data *data)
+{     /* read text until end of line */
+      int c, len = 0;
+      for (;;)
+      {  c = data->c;
+         next_char(data);
+         if (c == ' ')
+         {  /* ignore initial spaces */
+            if (len == 0) continue;
+            /* and multiple ones */
+            if (data->item[len-1] == ' ') continue;
+         }
+         else if (c == '\n')
+         {  /* remove trailing space */
+            if (len > 0 && data->item[len-1] == ' ') len--;
+            /* and stop reading */
+            break;
+         }
+         /* add current character to the buffer */
+         data->item[len++] = (char)c;
+         if (len == sizeof(data->item))
+            glp_sdf_error(data, "line too long\n", data->item);
+      }
+      data->item[len] = '\0';
+      return data->item;
+}
+
+int glp_sdf_line(glp_data *data)
+{     /* determine current line number */
+      return data->count;
+}
+
+void glp_sdf_close_file(glp_data *data)
+{     /* close plain data file */
+      xfclose(data->fp);
+      xfree(data->fname);
+      xfree(data);
+      return;
+}
+
+/* eof */