diff -r d59bea55db9b -r c445c931472f src/glpmps.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/glpmps.c	Mon Dec 06 13:09:21 2010 +0100
@@ -0,0 +1,1401 @@
+/* glpmps.c (MPS format 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/>.
+***********************************************************************/
+
+#include "glpapi.h"
+
+/***********************************************************************
+*  NAME
+*
+*  glp_init_mpscp - initialize MPS format control parameters
+*
+*  SYNOPSIS
+*
+*  void glp_init_mpscp(glp_mpscp *parm);
+*
+*  DESCRIPTION
+*
+*  The routine glp_init_mpscp initializes control parameters, which are
+*  used by the MPS input/output routines glp_read_mps and glp_write_mps,
+*  with default values.
+*
+*  Default values of the control parameters are stored in the glp_mpscp
+*  structure, which the parameter parm points to. */
+
+void glp_init_mpscp(glp_mpscp *parm)
+{     parm->blank = '\0';
+      parm->obj_name = NULL;
+      parm->tol_mps = 1e-12;
+      return;
+}
+
+static void check_parm(const char *func, const glp_mpscp *parm)
+{     /* check control parameters */
+      if (!(0x00 <= parm->blank && parm->blank <= 0xFF) ||
+          !(parm->blank == '\0' || isprint(parm->blank)))
+         xerror("%s: blank = 0x%02X; invalid parameter\n",
+            func, parm->blank);
+      if (!(parm->obj_name == NULL || strlen(parm->obj_name) <= 255))
+         xerror("%s: obj_name = \"%.12s...\"; parameter too long\n",
+            func, parm->obj_name);
+      if (!(0.0 <= parm->tol_mps && parm->tol_mps < 1.0))
+         xerror("%s: tol_mps = %g; invalid parameter\n",
+            func, parm->tol_mps);
+      return;
+}
+
+/***********************************************************************
+*  NAME
+*
+*  glp_read_mps - read problem data in MPS format
+*
+*  SYNOPSIS
+*
+*  int glp_read_mps(glp_prob *P, int fmt, const glp_mpscp *parm,
+*     const char *fname);
+*
+*  DESCRIPTION
+*
+*  The routine glp_read_mps reads problem data in MPS format from a
+*  text file.
+*
+*  The parameter fmt specifies the version of MPS format:
+*
+*  GLP_MPS_DECK - fixed (ancient) MPS format;
+*  GLP_MPS_FILE - free (modern) MPS format.
+*
+*  The parameter parm is a pointer to the structure glp_mpscp, which
+*  specifies control parameters used by the routine. If parm is NULL,
+*  the routine uses default settings.
+*
+*  The character string fname specifies a name of the text file to be
+*  read.
+*
+*  Note that before reading data the current content of the problem
+*  object is completely erased with the routine glp_erase_prob.
+*
+*  RETURNS
+*
+*  If the operation was successful, the routine glp_read_mps returns
+*  zero. Otherwise, it prints an error message and returns non-zero. */
+
+struct csa
+{     /* common storage area */
+      glp_prob *P;
+      /* pointer to problem object */
+      int deck;
+      /* MPS format (0 - free, 1 - fixed) */
+      const glp_mpscp *parm;
+      /* pointer to control parameters */
+      const char *fname;
+      /* name of input MPS file */
+      XFILE *fp;
+      /* stream assigned to input MPS file */
+      jmp_buf jump;
+      /* label for go to in case of error */
+      int recno;
+      /* current record (card) number */
+      int recpos;
+      /* current record (card) position */
+      int c;
+      /* current character */
+      int fldno;
+      /* current field number */
+      char field[255+1];
+      /* current field content */
+      int w80;
+      /* warning 'record must not be longer than 80 chars' issued */
+      int wef;
+      /* warning 'extra fields detected beyond field 6' issued */
+      int obj_row;
+      /* objective row number */
+      void *work1, *work2, *work3;
+      /* working arrays */
+};
+
+static void error(struct csa *csa, const char *fmt, ...)
+{     /* print error message and terminate processing */
+      va_list arg;
+      xprintf("%s:%d: ", csa->fname, csa->recno);
+      va_start(arg, fmt);
+      xvprintf(fmt, arg);
+      va_end(arg);
+      longjmp(csa->jump, 1);
+      /* no return */
+}
+
+static void warning(struct csa *csa, const char *fmt, ...)
+{     /* print warning message and continue processing */
+      va_list arg;
+      xprintf("%s:%d: warning: ", csa->fname, csa->recno);
+      va_start(arg, fmt);
+      xvprintf(fmt, arg);
+      va_end(arg);
+      return;
+}
+
+static void read_char(struct csa *csa)
+{     /* read next character */
+      int c;
+      if (csa->c == '\n')
+         csa->recno++, csa->recpos = 0;
+      csa->recpos++;
+read: c = xfgetc(csa->fp);
+      if (c < 0)
+      {  if (xferror(csa->fp))
+            error(csa, "read error - %s\n", xerrmsg());
+         else if (csa->c == '\n')
+            error(csa, "unexpected end of file\n");
+         else
+         {  warning(csa, "missing final end of line\n");
+            c = '\n';
+         }
+      }
+      else if (c == '\n')
+         ;
+      else if (csa->c == '\r')
+      {  c = '\r';
+         goto badc;
+      }
+      else if (csa->deck && c == '\r')
+      {  csa->c = '\r';
+         goto read;
+      }
+      else if (c == ' ')
+         ;
+      else if (isspace(c))
+      {  if (csa->deck)
+badc:       error(csa, "in fixed MPS format white-space character 0x%02"
+               "X is not allowed\n", c);
+         c = ' ';
+      }
+      else if (iscntrl(c))
+         error(csa, "invalid control character 0x%02X\n", c);
+      if (csa->deck && csa->recpos == 81 && c != '\n' && csa->w80 < 1)
+      {  warning(csa, "in fixed MPS format record must not be longer th"
+            "an 80 characters\n");
+         csa->w80++;
+      }
+      csa->c = c;
+      return;
+}
+
+static int indicator(struct csa *csa, int name)
+{     /* skip comment records and read possible indicator record */
+      int ret;
+      /* reset current field number */
+      csa->fldno = 0;
+loop: /* read the very first character of the next record */
+      xassert(csa->c == '\n');
+      read_char(csa);
+      if (csa->c == ' ' || csa->c == '\n')
+      {  /* data record */
+         ret = 0;
+      }
+      else if (csa->c == '*')
+      {  /* comment record */
+         while (csa->c != '\n')
+            read_char(csa);
+         goto loop;
+      }
+      else
+      {  /* indicator record */
+         int len = 0;
+         while (csa->c != ' ' && csa->c != '\n' && len < 12)
+         {  csa->field[len++] = (char)csa->c;
+            read_char(csa);
+         }
+         csa->field[len] = '\0';
+         if (!(strcmp(csa->field, "NAME")    == 0 ||
+               strcmp(csa->field, "ROWS")    == 0 ||
+               strcmp(csa->field, "COLUMNS") == 0 ||
+               strcmp(csa->field, "RHS")     == 0 ||
+               strcmp(csa->field, "RANGES")  == 0 ||
+               strcmp(csa->field, "BOUNDS")  == 0 ||
+               strcmp(csa->field, "ENDATA")  == 0))
+            error(csa, "invalid indicator record\n");
+         if (!name)
+         {  while (csa->c != '\n')
+               read_char(csa);
+         }
+         ret = 1;
+      }
+      return ret;
+}
+
+static void read_field(struct csa *csa)
+{     /* read next field of the current data record */
+      csa->fldno++;
+      if (csa->deck)
+      {  /* fixed MPS format */
+         int beg, end, pos;
+         /* determine predefined field positions */
+         if (csa->fldno == 1)
+            beg = 2, end = 3;
+         else if (csa->fldno == 2)
+            beg = 5, end = 12;
+         else if (csa->fldno == 3)
+            beg = 15, end = 22;
+         else if (csa->fldno == 4)
+            beg = 25, end = 36;
+         else if (csa->fldno == 5)
+            beg = 40, end = 47;
+         else if (csa->fldno == 6)
+            beg = 50, end = 61;
+         else
+            xassert(csa != csa);
+         /* skip blanks preceding the current field */
+         if (csa->c != '\n')
+         {  pos = csa->recpos;
+            while (csa->recpos < beg)
+            {  if (csa->c == ' ')
+                  ;
+               else if (csa->c == '\n')
+                  break;
+               else
+                  error(csa, "in fixed MPS format positions %d-%d must "
+                     "be blank\n", pos, beg-1);
+               read_char(csa);
+            }
+         }
+         /* skip possible comment beginning in the field 3 or 5 */
+         if ((csa->fldno == 3 || csa->fldno == 5) && csa->c == '$')
+         {  while (csa->c != '\n')
+               read_char(csa);
+         }
+         /* read the current field */
+         for (pos = beg; pos <= end; pos++)
+         {  if (csa->c == '\n') break;
+            csa->field[pos-beg] = (char)csa->c;
+            read_char(csa);
+         }
+         csa->field[pos-beg] = '\0';
+         strtrim(csa->field);
+         /* skip blanks following the last field */
+         if (csa->fldno == 6 && csa->c != '\n')
+         {  while (csa->recpos <= 72)
+            {  if (csa->c == ' ')
+                  ;
+               else if (csa->c == '\n')
+                  break;
+               else
+                  error(csa, "in fixed MPS format positions 62-72 must "
+                     "be blank\n");
+               read_char(csa);
+            }
+            while (csa->c != '\n')
+               read_char(csa);
+         }
+      }
+      else
+      {  /* free MPS format */
+         int len;
+         /* skip blanks preceding the current field */
+         while (csa->c == ' ')
+            read_char(csa);
+         /* skip possible comment */
+         if (csa->c == '$')
+         {  while (csa->c != '\n')
+               read_char(csa);
+         }
+         /* read the current field */
+         len = 0;
+         while (!(csa->c == ' ' || csa->c == '\n'))
+         {  if (len == 255)
+               error(csa, "length of field %d exceeds 255 characters\n",
+                  csa->fldno++);
+            csa->field[len++] = (char)csa->c;
+            read_char(csa);
+         }
+         csa->field[len] = '\0';
+         /* skip anything following the last field (any extra fields
+            are considered to be comments) */
+         if (csa->fldno == 6)
+         {  while (csa->c == ' ')
+               read_char(csa);
+            if (csa->c != '$' && csa->c != '\n' && csa->wef < 1)
+            {  warning(csa, "some extra field(s) detected beyond field "
+                  "6; field(s) ignored\n");
+               csa->wef++;
+            }
+            while (csa->c != '\n')
+               read_char(csa);
+         }
+      }
+      return;
+}
+
+static void patch_name(struct csa *csa, char *name)
+{     /* process embedded blanks in symbolic name */
+      int blank = csa->parm->blank;
+      if (blank == '\0')
+      {  /* remove emedded blanks */
+         strspx(name);
+      }
+      else
+      {  /* replace embedded blanks by specified character */
+         for (; *name != '\0'; name++)
+            if (*name == ' ') *name = (char)blank;
+      }
+      return;
+}
+
+static double read_number(struct csa *csa)
+{     /* read next field and convert it to floating-point number */
+      double x;
+      char *s;
+      /* read next field */
+      read_field(csa);
+      xassert(csa->fldno == 4 || csa->fldno == 6);
+      if (csa->field[0] == '\0')
+         error(csa, "missing numeric value in field %d\n", csa->fldno);
+      /* skip initial spaces of the field */
+      for (s = csa->field; *s == ' '; s++);
+      /* perform conversion */
+      if (str2num(s, &x) != 0)
+         error(csa, "cannot convert `%s' to floating-point number\n",
+            s);
+      return x;
+}
+
+static void skip_field(struct csa *csa)
+{     /* read and skip next field (assumed to be blank) */
+      read_field(csa);
+      if (csa->field[0] != '\0')
+         error(csa, "field %d must be blank\n", csa->fldno);
+      return;
+}
+
+static void read_name(struct csa *csa)
+{     /* read NAME indicator record */
+      if (!(indicator(csa, 1) && strcmp(csa->field, "NAME") == 0))
+         error(csa, "missing NAME indicator record\n");
+      /* this indicator record looks like a data record; simulate that
+         fields 1 and 2 were read */
+      csa->fldno = 2;
+      /* field 3: model name */
+      read_field(csa), patch_name(csa, csa->field);
+      if (csa->field[0] == '\0')
+         warning(csa, "missing model name in field 3\n");
+      else
+         glp_set_prob_name(csa->P, csa->field);
+      /* skip anything following field 3 */
+      while (csa->c != '\n')
+         read_char(csa);
+      return;
+}
+
+static void read_rows(struct csa *csa)
+{     /* read ROWS section */
+      int i, type;
+loop: if (indicator(csa, 0)) goto done;
+      /* field 1: row type */
+      read_field(csa), strspx(csa->field);
+      if (strcmp(csa->field, "N") == 0)
+         type = GLP_FR;
+      else if (strcmp(csa->field, "G") == 0)
+         type = GLP_LO;
+      else if (strcmp(csa->field, "L") == 0)
+         type = GLP_UP;
+      else if (strcmp(csa->field, "E") == 0)
+         type = GLP_FX;
+      else if (csa->field[0] == '\0')
+         error(csa, "missing row type in field 1\n");
+      else
+         error(csa, "invalid row type in field 1\n");
+      /* field 2: row name */
+      read_field(csa), patch_name(csa, csa->field);
+      if (csa->field[0] == '\0')
+         error(csa, "missing row name in field 2\n");
+      if (glp_find_row(csa->P, csa->field) != 0)
+         error(csa, "row `%s' multiply specified\n", csa->field);
+      i = glp_add_rows(csa->P, 1);
+      glp_set_row_name(csa->P, i, csa->field);
+      glp_set_row_bnds(csa->P, i, type, 0.0, 0.0);
+      /* fields 3, 4, 5, and 6 must be blank */
+      skip_field(csa);
+      skip_field(csa);
+      skip_field(csa);
+      skip_field(csa);
+      goto loop;
+done: return;
+}
+
+static void read_columns(struct csa *csa)
+{     /* read COLUMNS section */
+      int i, j, f, len, kind = GLP_CV, *ind;
+      double aij, *val;
+      char name[255+1], *flag;
+      /* allocate working arrays */
+      csa->work1 = ind = xcalloc(1+csa->P->m, sizeof(int));
+      csa->work2 = val = xcalloc(1+csa->P->m, sizeof(double));
+      csa->work3 = flag = xcalloc(1+csa->P->m, sizeof(char));
+      memset(&flag[1], 0, csa->P->m);
+      /* no current column exists */
+      j = 0, len = 0;
+loop: if (indicator(csa, 0)) goto done;
+      /* field 1 must be blank */
+      if (csa->deck)
+      {  read_field(csa);
+         if (csa->field[0] != '\0')
+            error(csa, "field 1 must be blank\n");
+      }
+      else
+         csa->fldno++;
+      /* field 2: column or kind name */
+      read_field(csa), patch_name(csa, csa->field);
+      strcpy(name, csa->field);
+      /* field 3: row name or keyword 'MARKER' */
+      read_field(csa), patch_name(csa, csa->field);
+      if (strcmp(csa->field, "'MARKER'") == 0)
+      {  /* process kind data record */
+         /* field 4 must be blank */
+         if (csa->deck)
+         {  read_field(csa);
+            if (csa->field[0] != '\0')
+               error(csa, "field 4 must be blank\n");
+         }
+         else
+            csa->fldno++;
+         /* field 5: keyword 'INTORG' or 'INTEND' */
+         read_field(csa), patch_name(csa, csa->field);
+         if (strcmp(csa->field, "'INTORG'") == 0)
+            kind = GLP_IV;
+         else if (strcmp(csa->field, "'INTEND'") == 0)
+            kind = GLP_CV;
+         else if (csa->field[0] == '\0')
+            error(csa, "missing keyword in field 5\n");
+         else
+            error(csa, "invalid keyword in field 5\n");
+         /* field 6 must be blank */
+         skip_field(csa);
+         goto loop;
+      }
+      /* process column name specified in field 2 */
+      if (name[0] == '\0')
+      {  /* the same column as in previous data record */
+         if (j == 0)
+            error(csa, "missing column name in field 2\n");
+      }
+      else if (j != 0 && strcmp(name, csa->P->col[j]->name) == 0)
+      {  /* the same column as in previous data record */
+         xassert(j != 0);
+      }
+      else
+      {  /* store the current column */
+         if (j != 0)
+         {  glp_set_mat_col(csa->P, j, len, ind, val);
+            while (len > 0) flag[ind[len--]] = 0;
+         }
+         /* create new column */
+         if (glp_find_col(csa->P, name) != 0)
+            error(csa, "column `%s' multiply specified\n", name);
+         j = glp_add_cols(csa->P, 1);
+         glp_set_col_name(csa->P, j, name);
+         glp_set_col_kind(csa->P, j, kind);
+         if (kind == GLP_CV)
+            glp_set_col_bnds(csa->P, j, GLP_LO, 0.0, 0.0);
+         else if (kind == GLP_IV)
+            glp_set_col_bnds(csa->P, j, GLP_DB, 0.0, 1.0);
+         else
+            xassert(kind != kind);
+      }
+      /* process fields 3-4 and 5-6 */
+      for (f = 3; f <= 5; f += 2)
+      {  /* field 3 or 5: row name */
+         if (f == 3)
+         {  if (csa->field[0] == '\0')
+               error(csa, "missing row name in field 3\n");
+         }
+         else
+         {  read_field(csa), patch_name(csa, csa->field);
+            if (csa->field[0] == '\0')
+            {  /* if field 5 is blank, field 6 also must be blank */
+               skip_field(csa);
+               continue;
+            }
+         }
+         i = glp_find_row(csa->P, csa->field);
+         if (i == 0)
+            error(csa, "row `%s' not found\n", csa->field);
+         if (flag[i])
+            error(csa, "duplicate coefficient in row `%s'\n",
+               csa->field);
+         /* field 4 or 6: coefficient value */
+         aij = read_number(csa);
+         if (fabs(aij) < csa->parm->tol_mps) aij = 0.0;
+         len++, ind[len] = i, val[len] = aij, flag[i] = 1;
+      }
+      goto loop;
+done: /* store the last column */
+      if (j != 0)
+         glp_set_mat_col(csa->P, j, len, ind, val);
+      /* free working arrays */
+      xfree(ind);
+      xfree(val);
+      xfree(flag);
+      csa->work1 = csa->work2 = csa->work3 = NULL;
+      return;
+}
+
+static void read_rhs(struct csa *csa)
+{     /* read RHS section */
+      int i, f, v, type;
+      double rhs;
+      char name[255+1], *flag;
+      /* allocate working array */
+      csa->work3 = flag = xcalloc(1+csa->P->m, sizeof(char));
+      memset(&flag[1], 0, csa->P->m);
+      /* no current RHS vector exists */
+      v = 0;
+loop: if (indicator(csa, 0)) goto done;
+      /* field 1 must be blank */
+      if (csa->deck)
+      {  read_field(csa);
+         if (csa->field[0] != '\0')
+            error(csa, "field 1 must be blank\n");
+      }
+      else
+         csa->fldno++;
+      /* field 2: RHS vector name */
+      read_field(csa), patch_name(csa, csa->field);
+      if (csa->field[0] == '\0')
+      {  /* the same RHS vector as in previous data record */
+         if (v == 0)
+         {  warning(csa, "missing RHS vector name in field 2\n");
+            goto blnk;
+         }
+      }
+      else if (v != 0 && strcmp(csa->field, name) == 0)
+      {  /* the same RHS vector as in previous data record */
+         xassert(v != 0);
+      }
+      else
+blnk: {  /* new RHS vector */
+         if (v != 0)
+            error(csa, "multiple RHS vectors not supported\n");
+         v++;
+         strcpy(name, csa->field);
+      }
+      /* process fields 3-4 and 5-6 */
+      for (f = 3; f <= 5; f += 2)
+      {  /* field 3 or 5: row name */
+         read_field(csa), patch_name(csa, csa->field);
+         if (csa->field[0] == '\0')
+         {  if (f == 3)
+               error(csa, "missing row name in field 3\n");
+            else
+            {  /* if field 5 is blank, field 6 also must be blank */
+               skip_field(csa);
+               continue;
+            }
+         }
+         i = glp_find_row(csa->P, csa->field);
+         if (i == 0)
+            error(csa, "row `%s' not found\n", csa->field);
+         if (flag[i])
+            error(csa, "duplicate right-hand side for row `%s'\n",
+               csa->field);
+         /* field 4 or 6: right-hand side value */
+         rhs = read_number(csa);
+         if (fabs(rhs) < csa->parm->tol_mps) rhs = 0.0;
+         type = csa->P->row[i]->type;
+         if (type == GLP_FR)
+         {  if (i == csa->obj_row)
+               glp_set_obj_coef(csa->P, 0, rhs);
+            else if (rhs != 0.0)
+               warning(csa, "non-zero right-hand side for free row `%s'"
+                  " ignored\n", csa->P->row[i]->name);
+         }
+         else
+            glp_set_row_bnds(csa->P, i, type, rhs, rhs);
+         flag[i] = 1;
+      }
+      goto loop;
+done: /* free working array */
+      xfree(flag);
+      csa->work3 = NULL;
+      return;
+}
+
+static void read_ranges(struct csa *csa)
+{     /* read RANGES section */
+      int i, f, v, type;
+      double rhs, rng;
+      char name[255+1], *flag;
+      /* allocate working array */
+      csa->work3 = flag = xcalloc(1+csa->P->m, sizeof(char));
+      memset(&flag[1], 0, csa->P->m);
+      /* no current RANGES vector exists */
+      v = 0;
+loop: if (indicator(csa, 0)) goto done;
+      /* field 1 must be blank */
+      if (csa->deck)
+      {  read_field(csa);
+         if (csa->field[0] != '\0')
+            error(csa, "field 1 must be blank\n");
+      }
+      else
+         csa->fldno++;
+      /* field 2: RANGES vector name */
+      read_field(csa), patch_name(csa, csa->field);
+      if (csa->field[0] == '\0')
+      {  /* the same RANGES vector as in previous data record */
+         if (v == 0)
+         {  warning(csa, "missing RANGES vector name in field 2\n");
+            goto blnk;
+         }
+      }
+      else if (v != 0 && strcmp(csa->field, name) == 0)
+      {  /* the same RANGES vector as in previous data record */
+         xassert(v != 0);
+      }
+      else
+blnk: {  /* new RANGES vector */
+         if (v != 0)
+            error(csa, "multiple RANGES vectors not supported\n");
+         v++;
+         strcpy(name, csa->field);
+      }
+      /* process fields 3-4 and 5-6 */
+      for (f = 3; f <= 5; f += 2)
+      {  /* field 3 or 5: row name */
+         read_field(csa), patch_name(csa, csa->field);
+         if (csa->field[0] == '\0')
+         {  if (f == 3)
+               error(csa, "missing row name in field 3\n");
+            else
+            {  /* if field 5 is blank, field 6 also must be blank */
+               skip_field(csa);
+               continue;
+            }
+         }
+         i = glp_find_row(csa->P, csa->field);
+         if (i == 0)
+            error(csa, "row `%s' not found\n", csa->field);
+         if (flag[i])
+            error(csa, "duplicate range for row `%s'\n", csa->field);
+         /* field 4 or 6: range value */
+         rng = read_number(csa);
+         if (fabs(rng) < csa->parm->tol_mps) rng = 0.0;
+         type = csa->P->row[i]->type;
+         if (type == GLP_FR)
+            warning(csa, "range for free row `%s' ignored\n",
+               csa->P->row[i]->name);
+         else if (type == GLP_LO)
+         {  rhs = csa->P->row[i]->lb;
+            glp_set_row_bnds(csa->P, i, rhs == 0.0 ? GLP_FX : GLP_DB,
+               rhs, rhs + fabs(rng));
+         }
+         else if (type == GLP_UP)
+         {  rhs = csa->P->row[i]->ub;
+            glp_set_row_bnds(csa->P, i, rhs == 0.0 ? GLP_FX : GLP_DB,
+               rhs - fabs(rng), rhs);
+         }
+         else if (type == GLP_FX)
+         {  rhs = csa->P->row[i]->lb;
+            if (rng > 0.0)
+               glp_set_row_bnds(csa->P, i, GLP_DB, rhs, rhs + rng);
+            else if (rng < 0.0)
+               glp_set_row_bnds(csa->P, i, GLP_DB, rhs + rng, rhs);
+         }
+         else
+            xassert(type != type);
+         flag[i] = 1;
+      }
+      goto loop;
+done: /* free working array */
+      xfree(flag);
+      csa->work3 = NULL;
+      return;
+}
+
+static void read_bounds(struct csa *csa)
+{     /* read BOUNDS section */
+      GLPCOL *col;
+      int j, v, mask, data;
+      double bnd, lb, ub;
+      char type[2+1], name[255+1], *flag;
+      /* allocate working array */
+      csa->work3 = flag = xcalloc(1+csa->P->n, sizeof(char));
+      memset(&flag[1], 0, csa->P->n);
+      /* no current BOUNDS vector exists */
+      v = 0;
+loop: if (indicator(csa, 0)) goto done;
+      /* field 1: bound type */
+      read_field(csa);
+      if (strcmp(csa->field, "LO") == 0)
+         mask = 0x01, data = 1;
+      else if (strcmp(csa->field, "UP") == 0)
+         mask = 0x10, data = 1;
+      else if (strcmp(csa->field, "FX") == 0)
+         mask = 0x11, data = 1;
+      else if (strcmp(csa->field, "FR") == 0)
+         mask = 0x11, data = 0;
+      else if (strcmp(csa->field, "MI") == 0)
+         mask = 0x01, data = 0;
+      else if (strcmp(csa->field, "PL") == 0)
+         mask = 0x10, data = 0;
+      else if (strcmp(csa->field, "LI") == 0)
+         mask = 0x01, data = 1;
+      else if (strcmp(csa->field, "UI") == 0)
+         mask = 0x10, data = 1;
+      else if (strcmp(csa->field, "BV") == 0)
+         mask = 0x11, data = 0;
+      else if (csa->field[0] == '\0')
+         error(csa, "missing bound type in field 1\n");
+      else
+         error(csa, "invalid bound type in field 1\n");
+      strcpy(type, csa->field);
+      /* field 2: BOUNDS vector name */
+      read_field(csa), patch_name(csa, csa->field);
+      if (csa->field[0] == '\0')
+      {  /* the same BOUNDS vector as in previous data record */
+         if (v == 0)
+         {  warning(csa, "missing BOUNDS vector name in field 2\n");
+            goto blnk;
+         }
+      }
+      else if (v != 0 && strcmp(csa->field, name) == 0)
+      {  /* the same BOUNDS vector as in previous data record */
+         xassert(v != 0);
+      }
+      else
+blnk: {  /* new BOUNDS vector */
+         if (v != 0)
+            error(csa, "multiple BOUNDS vectors not supported\n");
+         v++;
+         strcpy(name, csa->field);
+      }
+      /* field 3: column name */
+      read_field(csa), patch_name(csa, csa->field);
+      if (csa->field[0] == '\0')
+         error(csa, "missing column name in field 3\n");
+      j = glp_find_col(csa->P, csa->field);
+      if (j == 0)
+         error(csa, "column `%s' not found\n", csa->field);
+      if ((flag[j] & mask) == 0x01)
+         error(csa, "duplicate lower bound for column `%s'\n",
+            csa->field);
+      if ((flag[j] & mask) == 0x10)
+         error(csa, "duplicate upper bound for column `%s'\n",
+            csa->field);
+      xassert((flag[j] & mask) == 0x00);
+      /* field 4: bound value */
+      if (data)
+      {  bnd = read_number(csa);
+         if (fabs(bnd) < csa->parm->tol_mps) bnd = 0.0;
+      }
+      else
+         read_field(csa), bnd = 0.0;
+      /* get current column bounds */
+      col = csa->P->col[j];
+      if (col->type == GLP_FR)
+         lb = -DBL_MAX, ub = +DBL_MAX;
+      else if (col->type == GLP_LO)
+         lb = col->lb, ub = +DBL_MAX;
+      else if (col->type == GLP_UP)
+         lb = -DBL_MAX, ub = col->ub;
+      else if (col->type == GLP_DB)
+         lb = col->lb, ub = col->ub;
+      else if (col->type == GLP_FX)
+         lb = ub = col->lb;
+      else
+         xassert(col != col);
+      /* change column bounds */
+      if (strcmp(type, "LO") == 0)
+         lb = bnd;
+      else if (strcmp(type, "UP") == 0)
+         ub = bnd;
+      else if (strcmp(type, "FX") == 0)
+         lb = ub = bnd;
+      else if (strcmp(type, "FR") == 0)
+         lb = -DBL_MAX, ub = +DBL_MAX;
+      else if (strcmp(type, "MI") == 0)
+         lb = -DBL_MAX;
+      else if (strcmp(type, "PL") == 0)
+         ub = +DBL_MAX;
+      else if (strcmp(type, "LI") == 0)
+      {  glp_set_col_kind(csa->P, j, GLP_IV);
+         lb = ceil(bnd);
+      }
+      else if (strcmp(type, "UI") == 0)
+      {  glp_set_col_kind(csa->P, j, GLP_IV);
+         ub = floor(bnd);
+      }
+      else if (strcmp(type, "BV") == 0)
+      {  glp_set_col_kind(csa->P, j, GLP_IV);
+         lb = 0.0, ub = 1.0;
+      }
+      else
+         xassert(type != type);
+      /* set new column bounds */
+      if (lb == -DBL_MAX && ub == +DBL_MAX)
+         glp_set_col_bnds(csa->P, j, GLP_FR, lb, ub);
+      else if (ub == +DBL_MAX)
+         glp_set_col_bnds(csa->P, j, GLP_LO, lb, ub);
+      else if (lb == -DBL_MAX)
+         glp_set_col_bnds(csa->P, j, GLP_UP, lb, ub);
+      else if (lb != ub)
+         glp_set_col_bnds(csa->P, j, GLP_DB, lb, ub);
+      else
+         glp_set_col_bnds(csa->P, j, GLP_FX, lb, ub);
+      flag[j] |= (char)mask;
+      /* fields 5 and 6 must be blank */
+      skip_field(csa);
+      skip_field(csa);
+      goto loop;
+done: /* free working array */
+      xfree(flag);
+      csa->work3 = NULL;
+      return;
+}
+
+int glp_read_mps(glp_prob *P, int fmt, const glp_mpscp *parm,
+      const char *fname)
+{     /* read problem data in MPS format */
+      glp_mpscp _parm;
+      struct csa _csa, *csa = &_csa;
+      int ret;
+      xprintf("Reading problem data from `%s'...\n", fname);
+      if (!(fmt == GLP_MPS_DECK || fmt == GLP_MPS_FILE))
+         xerror("glp_read_mps: fmt = %d; invalid parameter\n", fmt);
+      if (parm == NULL)
+         glp_init_mpscp(&_parm), parm = &_parm;
+      /* check control parameters */
+      check_parm("glp_read_mps", parm);
+      /* initialize common storage area */
+      csa->P = P;
+      csa->deck = (fmt == GLP_MPS_DECK);
+      csa->parm = parm;
+      csa->fname = fname;
+      csa->fp = NULL;
+      if (setjmp(csa->jump))
+      {  ret = 1;
+         goto done;
+      }
+      csa->recno = csa->recpos = 0;
+      csa->c = '\n';
+      csa->fldno = 0;
+      csa->field[0] = '\0';
+      csa->w80 = csa->wef = 0;
+      csa->obj_row = 0;
+      csa->work1 = csa->work2 = csa->work3 = NULL;
+      /* erase problem object */
+      glp_erase_prob(P);
+      glp_create_index(P);
+      /* open input MPS file */
+      csa->fp = xfopen(fname, "r");
+      if (csa->fp == NULL)
+      {  xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
+         ret = 1;
+         goto done;
+      }
+      /* read NAME indicator record */
+      read_name(csa);
+      if (P->name != NULL)
+         xprintf("Problem: %s\n", P->name);
+      /* read ROWS section */
+      if (!(indicator(csa, 0) && strcmp(csa->field, "ROWS") == 0))
+         error(csa, "missing ROWS indicator record\n");
+      read_rows(csa);
+      /* determine objective row */
+      if (parm->obj_name == NULL || parm->obj_name[0] == '\0')
+      {  /* use the first row of N type */
+         int i;
+         for (i = 1; i <= P->m; i++)
+         {  if (P->row[i]->type == GLP_FR)
+            {  csa->obj_row = i;
+               break;
+            }
+         }
+         if (csa->obj_row == 0)
+            warning(csa, "unable to determine objective row\n");
+      }
+      else
+      {  /* use a row with specified name */
+         int i;
+         for (i = 1; i <= P->m; i++)
+         {  xassert(P->row[i]->name != NULL);
+            if (strcmp(parm->obj_name, P->row[i]->name) == 0)
+            {  csa->obj_row = i;
+               break;
+            }
+         }
+         if (csa->obj_row == 0)
+            error(csa, "objective row `%s' not found\n",
+               parm->obj_name);
+      }
+      if (csa->obj_row != 0)
+      {  glp_set_obj_name(P, P->row[csa->obj_row]->name);
+         xprintf("Objective: %s\n", P->obj);
+      }
+      /* read COLUMNS section */
+      if (strcmp(csa->field, "COLUMNS") != 0)
+         error(csa, "missing COLUMNS indicator record\n");
+      read_columns(csa);
+      /* set objective coefficients */
+      if (csa->obj_row != 0)
+      {  GLPAIJ *aij;
+         for (aij = P->row[csa->obj_row]->ptr; aij != NULL; aij =
+            aij->r_next) glp_set_obj_coef(P, aij->col->j, aij->val);
+      }
+      /* read optional RHS section */
+      if (strcmp(csa->field, "RHS") == 0)
+         read_rhs(csa);
+      /* read optional RANGES section */
+      if (strcmp(csa->field, "RANGES") == 0)
+         read_ranges(csa);
+      /* read optional BOUNDS section */
+      if (strcmp(csa->field, "BOUNDS") == 0)
+         read_bounds(csa);
+      /* read ENDATA indicator record */
+      if (strcmp(csa->field, "ENDATA") != 0)
+         error(csa, "invalid use of %s indicator record\n",
+            csa->field);
+      /* print some statistics */
+      xprintf("%d row%s, %d column%s, %d non-zero%s\n",
+         P->m, P->m == 1 ? "" : "s", P->n, P->n == 1 ? "" : "s",
+         P->nnz, P->nnz == 1 ? "" : "s");
+      if (glp_get_num_int(P) > 0)
+      {  int ni = glp_get_num_int(P);
+         int nb = glp_get_num_bin(P);
+         if (ni == 1)
+         {  if (nb == 0)
+               xprintf("One variable is integer\n");
+            else
+               xprintf("One variable is binary\n");
+         }
+         else
+         {  xprintf("%d integer variables, ", ni);
+            if (nb == 0)
+               xprintf("none");
+            else if (nb == 1)
+               xprintf("one");
+            else if (nb == ni)
+               xprintf("all");
+            else
+               xprintf("%d", nb);
+            xprintf(" of which %s binary\n", nb == 1 ? "is" : "are");
+         }
+      }
+      xprintf("%d records were read\n", csa->recno);
+      /* problem data has been successfully read */
+      glp_delete_index(P);
+      glp_sort_matrix(P);
+      ret = 0;
+done: if (csa->fp != NULL) xfclose(csa->fp);
+      if (csa->work1 != NULL) xfree(csa->work1);
+      if (csa->work2 != NULL) xfree(csa->work2);
+      if (csa->work3 != NULL) xfree(csa->work3);
+      if (ret != 0) glp_erase_prob(P);
+      return ret;
+}
+
+/***********************************************************************
+*  NAME
+*
+*  glp_write_mps - write problem data in MPS format
+*
+*  SYNOPSIS
+*
+*  int glp_write_mps(glp_prob *P, int fmt, const glp_mpscp *parm,
+*     const char *fname);
+*
+*  DESCRIPTION
+*
+*  The routine glp_write_mps writes problem data in MPS format to a
+*  text file.
+*
+*  The parameter fmt specifies the version of MPS format:
+*
+*  GLP_MPS_DECK - fixed (ancient) MPS format;
+*  GLP_MPS_FILE - free (modern) MPS format.
+*
+*  The parameter parm is a pointer to the structure glp_mpscp, which
+*  specifies control parameters used by the routine. If parm is NULL,
+*  the routine uses default settings.
+*
+*  The character string fname specifies a name of the text file to be
+*  written.
+*
+*  RETURNS
+*
+*  If the operation was successful, the routine glp_read_mps returns
+*  zero. Otherwise, it prints an error message and returns non-zero. */
+
+#define csa csa1
+
+struct csa
+{     /* common storage area */
+      glp_prob *P;
+      /* pointer to problem object */
+      int deck;
+      /* MPS format (0 - free, 1 - fixed) */
+      const glp_mpscp *parm;
+      /* pointer to control parameters */
+      char field[255+1];
+      /* field buffer */
+};
+
+static char *mps_name(struct csa *csa)
+{     /* make problem name */
+      char *f;
+      if (csa->P->name == NULL)
+         csa->field[0] = '\0';
+      else if (csa->deck)
+      {  strncpy(csa->field, csa->P->name, 8);
+         csa->field[8] = '\0';
+      }
+      else
+         strcpy(csa->field, csa->P->name);
+      for (f = csa->field; *f != '\0'; f++)
+         if (*f == ' ') *f = '_';
+      return csa->field;
+}
+
+static char *row_name(struct csa *csa, int i)
+{     /* make i-th row name */
+      char *f;
+      xassert(0 <= i && i <= csa->P->m);
+      if (i == 0 || csa->P->row[i]->name == NULL ||
+          csa->deck && strlen(csa->P->row[i]->name) > 8)
+         sprintf(csa->field, "R%07d", i);
+      else
+      {  strcpy(csa->field, csa->P->row[i]->name);
+         for (f = csa->field; *f != '\0'; f++)
+            if (*f == ' ') *f = '_';
+      }
+      return csa->field;
+}
+
+static char *col_name(struct csa *csa, int j)
+{     /* make j-th column name */
+      char *f;
+      xassert(1 <= j && j <= csa->P->n);
+      if (csa->P->col[j]->name == NULL ||
+          csa->deck && strlen(csa->P->col[j]->name) > 8)
+         sprintf(csa->field, "C%07d", j);
+      else
+      {  strcpy(csa->field, csa->P->col[j]->name);
+         for (f = csa->field; *f != '\0'; f++)
+            if (*f == ' ') *f = '_';
+      }
+      return csa->field;
+}
+
+static char *mps_numb(struct csa *csa, double val)
+{     /* format floating-point number */
+      int dig;
+      char *exp;
+      for (dig = 12; dig >= 6; dig--)
+      {  if (val != 0.0 && fabs(val) < 0.002)
+            sprintf(csa->field, "%.*E", dig-1, val);
+         else
+            sprintf(csa->field, "%.*G", dig, val);
+         exp = strchr(csa->field, 'E');
+         if (exp != NULL)
+            sprintf(exp+1, "%d", atoi(exp+1));
+         if (strlen(csa->field) <= 12) break;
+      }
+      xassert(strlen(csa->field) <= 12);
+      return csa->field;
+}
+
+int glp_write_mps(glp_prob *P, int fmt, const glp_mpscp *parm,
+      const char *fname)
+{     /* write problem data in MPS format */
+      glp_mpscp _parm;
+      struct csa _csa, *csa = &_csa;
+      XFILE *fp;
+      int out_obj, one_col = 0, empty = 0;
+      int i, j, recno, marker, count, gap, ret;
+      xprintf("Writing problem data to `%s'...\n", fname);
+      if (!(fmt == GLP_MPS_DECK || fmt == GLP_MPS_FILE))
+         xerror("glp_write_mps: fmt = %d; invalid parameter\n", fmt);
+      if (parm == NULL)
+         glp_init_mpscp(&_parm), parm = &_parm;
+      /* check control parameters */
+      check_parm("glp_write_mps", parm);
+      /* initialize common storage area */
+      csa->P = P;
+      csa->deck = (fmt == GLP_MPS_DECK);
+      csa->parm = parm;
+      /* create output MPS file */
+      fp = xfopen(fname, "w"), recno = 0;
+      if (fp == NULL)
+      {  xprintf("Unable to create `%s' - %s\n", fname, xerrmsg());
+         ret = 1;
+         goto done;
+      }
+      /* write comment records */
+      xfprintf(fp, "* %-*s%s\n", P->name == NULL ? 1 : 12, "Problem:",
+         P->name == NULL ? "" : P->name), recno++;
+      xfprintf(fp, "* %-12s%s\n", "Class:", glp_get_num_int(P) == 0 ?
+         "LP" : "MIP"), recno++;
+      xfprintf(fp, "* %-12s%d\n", "Rows:", P->m), recno++;
+      if (glp_get_num_int(P) == 0)
+         xfprintf(fp, "* %-12s%d\n", "Columns:", P->n), recno++;
+      else
+         xfprintf(fp, "* %-12s%d (%d integer, %d binary)\n",
+            "Columns:", P->n, glp_get_num_int(P), glp_get_num_bin(P)),
+            recno++;
+      xfprintf(fp, "* %-12s%d\n", "Non-zeros:", P->nnz), recno++;
+      xfprintf(fp, "* %-12s%s\n", "Format:", csa->deck ? "Fixed MPS" :
+         "Free MPS"), recno++;
+      xfprintf(fp, "*\n", recno++);
+      /* write NAME indicator record */
+      xfprintf(fp, "NAME%*s%s\n",
+         P->name == NULL ? 0 : csa->deck ? 10 : 1, "", mps_name(csa)),
+         recno++;
+#if 1
+      /* determine whether to write the objective row */
+      out_obj = 1;
+      for (i = 1; i <= P->m; i++)
+      {  if (P->row[i]->type == GLP_FR)
+         {  out_obj = 0;
+            break;
+         }
+      }
+#endif
+      /* write ROWS section */
+      xfprintf(fp, "ROWS\n"), recno++;
+      for (i = (out_obj ? 0 : 1); i <= P->m; i++)
+      {  int type;
+         type = (i == 0 ? GLP_FR : P->row[i]->type);
+         if (type == GLP_FR)
+            type = 'N';
+         else if (type == GLP_LO)
+            type = 'G';
+         else if (type == GLP_UP)
+            type = 'L';
+         else if (type == GLP_DB || type == GLP_FX)
+            type = 'E';
+         else
+            xassert(type != type);
+         xfprintf(fp, " %c%*s%s\n", type, csa->deck ? 2 : 1, "",
+            row_name(csa, i)), recno++;
+      }
+      /* write COLUMNS section */
+      xfprintf(fp, "COLUMNS\n"), recno++;
+      marker = 0;
+      for (j = 1; j <= P->n; j++)
+      {  GLPAIJ cj, *aij;
+         int kind;
+         kind = P->col[j]->kind;
+         if (kind == GLP_CV)
+         {  if (marker % 2 == 1)
+            {  /* close current integer block */
+               marker++;
+               xfprintf(fp, "%*sM%07d%*s'MARKER'%*s'INTEND'\n",
+                  csa->deck ? 4 : 1, "", marker, csa->deck ? 2 : 1, "",
+                  csa->deck ? 17 : 1, ""), recno++;
+            }
+         }
+         else if (kind == GLP_IV)
+         {  if (marker % 2 == 0)
+            {  /* open new integer block */
+               marker++;
+               xfprintf(fp, "%*sM%07d%*s'MARKER'%*s'INTORG'\n",
+                  csa->deck ? 4 : 1, "", marker, csa->deck ? 2 : 1, "",
+                  csa->deck ? 17 : 1, ""), recno++;
+            }
+         }
+         else
+            xassert(kind != kind);
+         if (out_obj && P->col[j]->coef != 0.0)
+         {  /* make fake objective coefficient */
+            aij = &cj;
+            aij->row = NULL;
+            aij->val = P->col[j]->coef;
+            aij->c_next = P->col[j]->ptr;
+         }
+         else
+            aij = P->col[j]->ptr;
+#if 1 /* FIXME */
+         if (aij == NULL)
+         {  /* empty column */
+            empty++;
+            xfprintf(fp, "%*s%-*s", csa->deck ? 4 : 1, "",
+               csa->deck ? 8 : 1, col_name(csa, j));
+            /* we need a row */
+            xassert(P->m > 0);
+            xfprintf(fp, "%*s%-*s",
+               csa->deck ? 2 : 1, "", csa->deck ? 8 : 1,
+               row_name(csa, 1));
+            xfprintf(fp, "%*s0%*s$ empty column\n",
+               csa->deck ? 13 : 1, "", csa->deck ? 3 : 1, ""), recno++;
+         }
+#endif
+         count = 0;
+         for (aij = aij; aij != NULL; aij = aij->c_next)
+         {  if (one_col || count % 2 == 0)
+               xfprintf(fp, "%*s%-*s", csa->deck ? 4 : 1, "",
+                  csa->deck ? 8 : 1, col_name(csa, j));
+            gap = (one_col || count % 2 == 0 ? 2 : 3);
+            xfprintf(fp, "%*s%-*s",
+               csa->deck ? gap : 1, "", csa->deck ? 8 : 1,
+               row_name(csa, aij->row == NULL ? 0 : aij->row->i));
+            xfprintf(fp, "%*s%*s",
+               csa->deck ? 2 : 1, "", csa->deck ? 12 : 1,
+               mps_numb(csa, aij->val)), count++;
+            if (one_col || count % 2 == 0)
+               xfprintf(fp, "\n"), recno++;
+         }
+         if (!(one_col || count % 2 == 0))
+            xfprintf(fp, "\n"), recno++;
+      }
+      if (marker % 2 == 1)
+      {  /* close last integer block */
+         marker++;
+         xfprintf(fp, "%*sM%07d%*s'MARKER'%*s'INTEND'\n",
+            csa->deck ? 4 : 1, "", marker, csa->deck ? 2 : 1, "",
+            csa->deck ? 17 : 1, ""), recno++;
+      }
+#if 1
+      if (empty > 0)
+         xprintf("Warning: problem has %d empty column(s)\n", empty);
+#endif
+      /* write RHS section */
+      xfprintf(fp, "RHS\n"), recno++;
+      count = 0;
+      for (i = (out_obj ? 0 : 1); i <= P->m; i++)
+      {  int type;
+         double rhs;
+         if (i == 0)
+            rhs = P->c0;
+         else
+         {  type = P->row[i]->type;
+            if (type == GLP_FR)
+               rhs = 0.0;
+            else if (type == GLP_LO)
+               rhs = P->row[i]->lb;
+            else if (type == GLP_UP)
+               rhs = P->row[i]->ub;
+            else if (type == GLP_DB || type == GLP_FX)
+               rhs = P->row[i]->lb;
+            else
+               xassert(type != type);
+         }
+         if (rhs != 0.0)
+         {  if (one_col || count % 2 == 0)
+               xfprintf(fp, "%*s%-*s", csa->deck ? 4 : 1, "",
+                  csa->deck ? 8 : 1, "RHS1");
+            gap = (one_col || count % 2 == 0 ? 2 : 3);
+            xfprintf(fp, "%*s%-*s",
+               csa->deck ? gap : 1, "", csa->deck ? 8 : 1,
+               row_name(csa, i));
+            xfprintf(fp, "%*s%*s",
+               csa->deck ? 2 : 1, "", csa->deck ? 12 : 1,
+               mps_numb(csa, rhs)), count++;
+            if (one_col || count % 2 == 0)
+               xfprintf(fp, "\n"), recno++;
+         }
+      }
+      if (!(one_col || count % 2 == 0))
+         xfprintf(fp, "\n"), recno++;
+      /* write RANGES section */
+      for (i = P->m; i >= 1; i--)
+         if (P->row[i]->type == GLP_DB) break;
+      if (i == 0) goto bnds;
+      xfprintf(fp, "RANGES\n"), recno++;
+      count = 0;
+      for (i = 1; i <= P->m; i++)
+      {  if (P->row[i]->type == GLP_DB)
+         {  if (one_col || count % 2 == 0)
+               xfprintf(fp, "%*s%-*s", csa->deck ? 4 : 1, "",
+                  csa->deck ? 8 : 1, "RNG1");
+            gap = (one_col || count % 2 == 0 ? 2 : 3);
+            xfprintf(fp, "%*s%-*s",
+               csa->deck ? gap : 1, "", csa->deck ? 8 : 1,
+               row_name(csa, i));
+            xfprintf(fp, "%*s%*s",
+               csa->deck ? 2 : 1, "", csa->deck ? 12 : 1,
+               mps_numb(csa, P->row[i]->ub - P->row[i]->lb)), count++;
+            if (one_col || count % 2 == 0)
+               xfprintf(fp, "\n"), recno++;
+         }
+      }
+      if (!(one_col || count % 2 == 0))
+         xfprintf(fp, "\n"), recno++;
+bnds: /* write BOUNDS section */
+      for (j = P->n; j >= 1; j--)
+         if (!(P->col[j]->type == GLP_LO && P->col[j]->lb == 0.0))
+            break;
+      if (j == 0) goto endt;
+      xfprintf(fp, "BOUNDS\n"), recno++;
+      for (j = 1; j <= P->n; j++)
+      {  int type, data[2];
+         double bnd[2];
+         char *spec[2];
+         spec[0] = spec[1] = NULL;
+         type = P->col[j]->type;
+         if (type == GLP_FR)
+            spec[0] = "FR", data[0] = 0;
+         else if (type == GLP_LO)
+         {  if (P->col[j]->lb != 0.0)
+               spec[0] = "LO", data[0] = 1, bnd[0] = P->col[j]->lb;
+            if (P->col[j]->kind == GLP_IV)
+               spec[1] = "PL", data[1] = 0;
+         }
+         else if (type == GLP_UP)
+         {  spec[0] = "MI", data[0] = 0;
+            spec[1] = "UP", data[1] = 1, bnd[1] = P->col[j]->ub;
+         }
+         else if (type == GLP_DB)
+         {  if (P->col[j]->lb != 0.0)
+               spec[0] = "LO", data[0] = 1, bnd[0] = P->col[j]->lb;
+            spec[1] = "UP", data[1] = 1, bnd[1] = P->col[j]->ub;
+         }
+         else if (type == GLP_FX)
+            spec[0] = "FX", data[0] = 1, bnd[0] = P->col[j]->lb;
+         else
+            xassert(type != type);
+         for (i = 0; i <= 1; i++)
+         {  if (spec[i] != NULL)
+            {  xfprintf(fp, " %s %-*s%*s%-*s", spec[i],
+                  csa->deck ? 8 : 1, "BND1", csa->deck ? 2 : 1, "",
+                  csa->deck ? 8 : 1, col_name(csa, j));
+               if (data[i])
+                  xfprintf(fp, "%*s%*s", csa->deck ? 2 : 1, "",
+                     csa->deck ? 12 : 1, mps_numb(csa, bnd[i]));
+               xfprintf(fp, "\n"), recno++;
+            }
+         }
+      }
+endt: /* write ENDATA indicator record */
+      xfprintf(fp, "ENDATA\n"), recno++;
+      xfflush(fp);
+      if (xferror(fp))
+      {  xprintf("Write error on `%s' - %s\n", fname, xerrmsg());
+         ret = 1;
+         goto done;
+      }
+      /* problem data has been successfully written */
+      xprintf("%d records were written\n", recno);
+      ret = 0;
+done: if (fp != NULL) xfclose(fp);
+      return ret;
+}
+
+/* eof */