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