alpar@1: /* glpcpx.c (CPLEX LP format 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: #include "glpapi.h"
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  NAME
alpar@1: *
alpar@1: *  glp_init_cpxcp - initialize CPLEX LP format control parameters
alpar@1: *
alpar@1: *  SYNOPSIS
alpar@1: *
alpar@1: *  void glp_init_cpxcp(glp_cpxcp *parm):
alpar@1: *
alpar@1: *  The routine glp_init_cpxcp initializes control parameters used by
alpar@1: *  the CPLEX LP input/output routines glp_read_lp and glp_write_lp with
alpar@1: *  default values.
alpar@1: *
alpar@1: *  Default values of the control parameters are stored in the glp_cpxcp
alpar@1: *  structure, which the parameter parm points to. */
alpar@1: 
alpar@1: void glp_init_cpxcp(glp_cpxcp *parm)
alpar@1: {     xassert(parm != NULL);
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static void check_parm(const char *func, const glp_cpxcp *parm)
alpar@1: {     /* check control parameters */
alpar@1:       xassert(func != NULL);
alpar@1:       xassert(parm != NULL);
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  NAME
alpar@1: *
alpar@1: *  glp_read_lp - read problem data in CPLEX LP format
alpar@1: *
alpar@1: *  SYNOPSIS
alpar@1: *
alpar@1: *  int glp_read_lp(glp_prob *P, const glp_cpxcp *parm, const char
alpar@1: *     *fname);
alpar@1: *
alpar@1: *  DESCRIPTION
alpar@1: *
alpar@1: *  The routine glp_read_lp reads problem data in CPLEX LP format from
alpar@1: *  a text file.
alpar@1: *
alpar@1: *  The parameter parm is a pointer to the structure glp_cpxcp, which
alpar@1: *  specifies control parameters used by the routine. If parm is NULL,
alpar@1: *  the routine uses default settings.
alpar@1: *
alpar@1: *  The character string fname specifies a name of the text file to be
alpar@1: *  read.
alpar@1: *
alpar@1: *  Note that before reading data the current content of the problem
alpar@1: *  object is completely erased with the routine glp_erase_prob.
alpar@1: *
alpar@1: *  RETURNS
alpar@1: *
alpar@1: *  If the operation was successful, the routine glp_read_lp returns
alpar@1: *  zero. Otherwise, it prints an error message and returns non-zero. */
alpar@1: 
alpar@1: struct csa
alpar@1: {     /* common storage area */
alpar@1:       glp_prob *P;
alpar@1:       /* LP/MIP problem object */
alpar@1:       const glp_cpxcp *parm;
alpar@1:       /* pointer to control parameters */
alpar@1:       const char *fname;
alpar@1:       /* name of input CPLEX LP file */
alpar@1:       XFILE *fp;
alpar@1:       /* stream assigned to input CPLEX LP file */
alpar@1:       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 or XEOF */
alpar@1:       int token;
alpar@1:       /* current token: */
alpar@1: #define T_EOF        0x00  /* end of file */
alpar@1: #define T_MINIMIZE   0x01  /* keyword 'minimize' */
alpar@1: #define T_MAXIMIZE   0x02  /* keyword 'maximize' */
alpar@1: #define T_SUBJECT_TO 0x03  /* keyword 'subject to' */
alpar@1: #define T_BOUNDS     0x04  /* keyword 'bounds' */
alpar@1: #define T_GENERAL    0x05  /* keyword 'general' */
alpar@1: #define T_INTEGER    0x06  /* keyword 'integer' */
alpar@1: #define T_BINARY     0x07  /* keyword 'binary' */
alpar@1: #define T_END        0x08  /* keyword 'end' */
alpar@1: #define T_NAME       0x09  /* symbolic name */
alpar@1: #define T_NUMBER     0x0A  /* numeric constant */
alpar@1: #define T_PLUS       0x0B  /* delimiter '+' */
alpar@1: #define T_MINUS      0x0C  /* delimiter '-' */
alpar@1: #define T_COLON      0x0D  /* delimiter ':' */
alpar@1: #define T_LE         0x0E  /* delimiter '<=' */
alpar@1: #define T_GE         0x0F  /* delimiter '>=' */
alpar@1: #define T_EQ         0x10  /* delimiter '=' */
alpar@1:       char image[255+1];
alpar@1:       /* image of current token */
alpar@1:       int imlen;
alpar@1:       /* length of token image */
alpar@1:       double value;
alpar@1:       /* value of numeric constant */
alpar@1:       int n_max;
alpar@1:       /* length of the following five arrays (enlarged automatically,
alpar@1:          if necessary) */
alpar@1:       int *ind; /* int ind[1+n_max]; */
alpar@1:       double *val; /* double val[1+n_max]; */
alpar@1:       char *flag; /* char flag[1+n_max]; */
alpar@1:       /* working arrays used to construct linear forms */
alpar@1:       double *lb; /* double lb[1+n_max]; */
alpar@1:       double *ub; /* double ub[1+n_max]; */
alpar@1:       /* lower and upper bounds of variables (columns) */
alpar@1: };
alpar@1: 
alpar@1: #define CHAR_SET "!\"#$%&()/,.;?@_`'{}|~"
alpar@1: /* characters, which may appear in symbolic names */
alpar@1: 
alpar@1: static void error(struct csa *csa, const char *fmt, ...)
alpar@1: {     /* print error message and terminate processing */
alpar@1:       va_list arg;
alpar@1:       xprintf("%s:%d: ", csa->fname, csa->count);
alpar@1:       va_start(arg, fmt);
alpar@1:       xvprintf(fmt, arg);
alpar@1:       va_end(arg);
alpar@1:       longjmp(csa->jump, 1);
alpar@1:       /* no return */
alpar@1: }
alpar@1: 
alpar@1: static void warning(struct csa *csa, const char *fmt, ...)
alpar@1: {     /* print warning message and continue processing */
alpar@1:       va_list arg;
alpar@1:       xprintf("%s:%d: warning: ", csa->fname, csa->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 read_char(struct csa *csa)
alpar@1: {     /* read next character from input file */
alpar@1:       int c;
alpar@1:       xassert(csa->c != XEOF);
alpar@1:       if (csa->c == '\n') csa->count++;
alpar@1:       c = xfgetc(csa->fp);
alpar@1:       if (c < 0)
alpar@1:       {  if (xferror(csa->fp))
alpar@1:             error(csa, "read error - %s\n", xerrmsg());
alpar@1:          else if (csa->c == '\n')
alpar@1:          {  csa->count--;
alpar@1:             c = XEOF;
alpar@1:          }
alpar@1:          else
alpar@1:          {  warning(csa, "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:          error(csa, "invalid control character 0x%02X\n", c);
alpar@1:       csa->c = c;
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static void add_char(struct csa *csa)
alpar@1: {     /* append current character to current token */
alpar@1:       if (csa->imlen == sizeof(csa->image)-1)
alpar@1:          error(csa, "token `%.15s...' too long\n", csa->image);
alpar@1:       csa->image[csa->imlen++] = (char)csa->c;
alpar@1:       csa->image[csa->imlen] = '\0';
alpar@1:       read_char(csa);
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static int the_same(char *s1, char *s2)
alpar@1: {     /* compare two character strings ignoring case sensitivity */
alpar@1:       for (; *s1 != '\0'; s1++, s2++)
alpar@1:       {  if (tolower((unsigned char)*s1) != tolower((unsigned char)*s2))
alpar@1:             return 0;
alpar@1:       }
alpar@1:       return 1;
alpar@1: }
alpar@1: 
alpar@1: static void scan_token(struct csa *csa)
alpar@1: {     /* scan next token */
alpar@1:       int flag;
alpar@1:       csa->token = -1;
alpar@1:       csa->image[0] = '\0';
alpar@1:       csa->imlen = 0;
alpar@1:       csa->value = 0.0;
alpar@1: loop: flag = 0;
alpar@1:       /* skip non-significant characters */
alpar@1:       while (csa->c == ' ') read_char(csa);
alpar@1:       /* recognize and scan current token */
alpar@1:       if (csa->c == XEOF)
alpar@1:          csa->token = T_EOF;
alpar@1:       else if (csa->c == '\n')
alpar@1:       {  read_char(csa);
alpar@1:          /* if the next character is letter, it may begin a keyword */
alpar@1:          if (isalpha(csa->c))
alpar@1:          {  flag = 1;
alpar@1:             goto name;
alpar@1:          }
alpar@1:          goto loop;
alpar@1:       }
alpar@1:       else if (csa->c == '\\')
alpar@1:       {  /* comment; ignore everything until end-of-line */
alpar@1:          while (csa->c != '\n') read_char(csa);
alpar@1:          goto loop;
alpar@1:       }
alpar@1:       else if (isalpha(csa->c) || csa->c != '.' && strchr(CHAR_SET,
alpar@1:          csa->c) != NULL)
alpar@1: name: {  /* symbolic name */
alpar@1:          csa->token = T_NAME;
alpar@1:          while (isalnum(csa->c) || strchr(CHAR_SET, csa->c) != NULL)
alpar@1:             add_char(csa);
alpar@1:          if (flag)
alpar@1:          {  /* check for keyword */
alpar@1:             if (the_same(csa->image, "minimize"))
alpar@1:                csa->token = T_MINIMIZE;
alpar@1:             else if (the_same(csa->image, "minimum"))
alpar@1:                csa->token = T_MINIMIZE;
alpar@1:             else if (the_same(csa->image, "min"))
alpar@1:                csa->token = T_MINIMIZE;
alpar@1:             else if (the_same(csa->image, "maximize"))
alpar@1:                csa->token = T_MAXIMIZE;
alpar@1:             else if (the_same(csa->image, "maximum"))
alpar@1:                csa->token = T_MAXIMIZE;
alpar@1:             else if (the_same(csa->image, "max"))
alpar@1:                csa->token = T_MAXIMIZE;
alpar@1:             else if (the_same(csa->image, "subject"))
alpar@1:             {  if (csa->c == ' ')
alpar@1:                {  read_char(csa);
alpar@1:                   if (tolower(csa->c) == 't')
alpar@1:                   {  csa->token = T_SUBJECT_TO;
alpar@1:                      csa->image[csa->imlen++] = ' ';
alpar@1:                      csa->image[csa->imlen] = '\0';
alpar@1:                      add_char(csa);
alpar@1:                      if (tolower(csa->c) != 'o')
alpar@1:                         error(csa, "keyword `subject to' incomplete\n");
alpar@1:                      add_char(csa);
alpar@1:                      if (isalpha(csa->c))
alpar@1:                         error(csa, "keyword `%s%c...' not recognized\n",
alpar@1:                            csa->image, csa->c);
alpar@1:                   }
alpar@1:                }
alpar@1:             }
alpar@1:             else if (the_same(csa->image, "such"))
alpar@1:             {  if (csa->c == ' ')
alpar@1:                {  read_char(csa);
alpar@1:                   if (tolower(csa->c) == 't')
alpar@1:                   {  csa->token = T_SUBJECT_TO;
alpar@1:                      csa->image[csa->imlen++] = ' ';
alpar@1:                      csa->image[csa->imlen] = '\0';
alpar@1:                      add_char(csa);
alpar@1:                      if (tolower(csa->c) != 'h')
alpar@1: err:                    error(csa, "keyword `such that' incomplete\n");
alpar@1:                      add_char(csa);
alpar@1:                      if (tolower(csa->c) != 'a') goto err;
alpar@1:                      add_char(csa);
alpar@1:                      if (tolower(csa->c) != 't') goto err;
alpar@1:                      add_char(csa);
alpar@1:                      if (isalpha(csa->c))
alpar@1:                         error(csa, "keyword `%s%c...' not recognized\n",
alpar@1:                            csa->image, csa->c);
alpar@1:                   }
alpar@1:                }
alpar@1:             }
alpar@1:             else if (the_same(csa->image, "st"))
alpar@1:                csa->token = T_SUBJECT_TO;
alpar@1:             else if (the_same(csa->image, "s.t."))
alpar@1:                csa->token = T_SUBJECT_TO;
alpar@1:             else if (the_same(csa->image, "st."))
alpar@1:                csa->token = T_SUBJECT_TO;
alpar@1:             else if (the_same(csa->image, "bounds"))
alpar@1:                csa->token = T_BOUNDS;
alpar@1:             else if (the_same(csa->image, "bound"))
alpar@1:                csa->token = T_BOUNDS;
alpar@1:             else if (the_same(csa->image, "general"))
alpar@1:                csa->token = T_GENERAL;
alpar@1:             else if (the_same(csa->image, "generals"))
alpar@1:                csa->token = T_GENERAL;
alpar@1:             else if (the_same(csa->image, "gen"))
alpar@1:                csa->token = T_GENERAL;
alpar@1:             else if (the_same(csa->image, "integer"))
alpar@1:                csa->token = T_INTEGER;
alpar@1:             else if (the_same(csa->image, "integers"))
alpar@1:                csa->token = T_INTEGER;
alpar@1:             else if (the_same(csa->image, "int"))
alpar@1:               csa->token = T_INTEGER;
alpar@1:             else if (the_same(csa->image, "binary"))
alpar@1:                csa->token = T_BINARY;
alpar@1:             else if (the_same(csa->image, "binaries"))
alpar@1:                csa->token = T_BINARY;
alpar@1:             else if (the_same(csa->image, "bin"))
alpar@1:                csa->token = T_BINARY;
alpar@1:             else if (the_same(csa->image, "end"))
alpar@1:                csa->token = T_END;
alpar@1:          }
alpar@1:       }
alpar@1:       else if (isdigit(csa->c) || csa->c == '.')
alpar@1:       {  /* numeric constant */
alpar@1:          csa->token = T_NUMBER;
alpar@1:          /* scan integer part */
alpar@1:          while (isdigit(csa->c)) add_char(csa);
alpar@1:          /* scan optional fractional part (it is mandatory, if there is
alpar@1:             no integer part) */
alpar@1:          if (csa->c == '.')
alpar@1:          {  add_char(csa);
alpar@1:             if (csa->imlen == 1 && !isdigit(csa->c))
alpar@1:                error(csa, "invalid use of decimal point\n");
alpar@1:             while (isdigit(csa->c)) add_char(csa);
alpar@1:          }
alpar@1:          /* scan optional decimal exponent */
alpar@1:          if (csa->c == 'e' || csa->c == 'E')
alpar@1:          {  add_char(csa);
alpar@1:             if (csa->c == '+' || csa->c == '-') add_char(csa);
alpar@1:             if (!isdigit(csa->c))
alpar@1:                error(csa, "numeric constant `%s' incomplete\n",
alpar@1:                   csa->image);
alpar@1:             while (isdigit(csa->c)) add_char(csa);
alpar@1:          }
alpar@1:          /* convert the numeric constant to floating-point */
alpar@1:          if (str2num(csa->image, &csa->value))
alpar@1:             error(csa, "numeric constant `%s' out of range\n",
alpar@1:                csa->image);
alpar@1:       }
alpar@1:       else if (csa->c == '+')
alpar@1:          csa->token = T_PLUS, add_char(csa);
alpar@1:       else if (csa->c == '-')
alpar@1:          csa->token = T_MINUS, add_char(csa);
alpar@1:       else if (csa->c == ':')
alpar@1:          csa->token = T_COLON, add_char(csa);
alpar@1:       else if (csa->c == '<')
alpar@1:       {  csa->token = T_LE, add_char(csa);
alpar@1:          if (csa->c == '=') add_char(csa);
alpar@1:       }
alpar@1:       else if (csa->c == '>')
alpar@1:       {  csa->token = T_GE, add_char(csa);
alpar@1:          if (csa->c == '=') add_char(csa);
alpar@1:       }
alpar@1:       else if (csa->c == '=')
alpar@1:       {  csa->token = T_EQ, add_char(csa);
alpar@1:          if (csa->c == '<')
alpar@1:             csa->token = T_LE, add_char(csa);
alpar@1:          else if (csa->c == '>')
alpar@1:             csa->token = T_GE, add_char(csa);
alpar@1:       }
alpar@1:       else
alpar@1:          error(csa, "character `%c' not recognized\n", csa->c);
alpar@1:       /* skip non-significant characters */
alpar@1:       while (csa->c == ' ') read_char(csa);
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static int find_col(struct csa *csa, char *name)
alpar@1: {     /* find column by its symbolic name */
alpar@1:       int j;
alpar@1:       j = glp_find_col(csa->P, name);
alpar@1:       if (j == 0)
alpar@1:       {  /* not found; create new column */
alpar@1:          j = glp_add_cols(csa->P, 1);
alpar@1:          glp_set_col_name(csa->P, j, name);
alpar@1:          /* enlarge working arrays, if necessary */
alpar@1:          if (csa->n_max < j)
alpar@1:          {  int n_max = csa->n_max;
alpar@1:             int *ind = csa->ind;
alpar@1:             double *val = csa->val;
alpar@1:             char *flag = csa->flag;
alpar@1:             double *lb = csa->lb;
alpar@1:             double *ub = csa->ub;
alpar@1:             csa->n_max += csa->n_max;
alpar@1:             csa->ind = xcalloc(1+csa->n_max, sizeof(int));
alpar@1:             memcpy(&csa->ind[1], &ind[1], n_max * sizeof(int));
alpar@1:             xfree(ind);
alpar@1:             csa->val = xcalloc(1+csa->n_max, sizeof(double));
alpar@1:             memcpy(&csa->val[1], &val[1], n_max * sizeof(double));
alpar@1:             xfree(val);
alpar@1:             csa->flag = xcalloc(1+csa->n_max, sizeof(char));
alpar@1:             memset(&csa->flag[1], 0, csa->n_max * sizeof(char));
alpar@1:             memcpy(&csa->flag[1], &flag[1], n_max * sizeof(char));
alpar@1:             xfree(flag);
alpar@1:             csa->lb = xcalloc(1+csa->n_max, sizeof(double));
alpar@1:             memcpy(&csa->lb[1], &lb[1], n_max * sizeof(double));
alpar@1:             xfree(lb);
alpar@1:             csa->ub = xcalloc(1+csa->n_max, sizeof(double));
alpar@1:             memcpy(&csa->ub[1], &ub[1], n_max * sizeof(double));
alpar@1:             xfree(ub);
alpar@1:          }
alpar@1:          csa->lb[j] = +DBL_MAX, csa->ub[j] = -DBL_MAX;
alpar@1:       }
alpar@1:       return j;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  parse_linear_form - parse linear form
alpar@1: *
alpar@1: *  This routine parses the linear form using the following syntax:
alpar@1: *
alpar@1: *  <variable> ::= <symbolic name>
alpar@1: *  <coefficient> ::= <numeric constant>
alpar@1: *  <term> ::= <variable> | <numeric constant> <variable>
alpar@1: *  <linear form> ::= <term> | + <term> | - <term> |
alpar@1: *     <linear form> + <term> | <linear form> - <term>
alpar@1: *
alpar@1: *  The routine returns the number of terms in the linear form. */
alpar@1: 
alpar@1: static int parse_linear_form(struct csa *csa)
alpar@1: {     int j, k, len = 0, newlen;
alpar@1:       double s, coef;
alpar@1: loop: /* parse an optional sign */
alpar@1:       if (csa->token == T_PLUS)
alpar@1:          s = +1.0, scan_token(csa);
alpar@1:       else if (csa->token == T_MINUS)
alpar@1:          s = -1.0, scan_token(csa);
alpar@1:       else
alpar@1:          s = +1.0;
alpar@1:       /* parse an optional coefficient */
alpar@1:       if (csa->token == T_NUMBER)
alpar@1:          coef = csa->value, scan_token(csa);
alpar@1:       else
alpar@1:          coef = 1.0;
alpar@1:       /* parse a variable name */
alpar@1:       if (csa->token != T_NAME)
alpar@1:          error(csa, "missing variable name\n");
alpar@1:       /* find the corresponding column */
alpar@1:       j = find_col(csa, csa->image);
alpar@1:       /* check if the variable is already used in the linear form */
alpar@1:       if (csa->flag[j])
alpar@1:          error(csa, "multiple use of variable `%s' not allowed\n",
alpar@1:             csa->image);
alpar@1:       /* add new term to the linear form */
alpar@1:       len++, csa->ind[len] = j, csa->val[len] = s * coef;
alpar@1:       /* and mark that the variable is used in the linear form */
alpar@1:       csa->flag[j] = 1;
alpar@1:       scan_token(csa);
alpar@1:       /* if the next token is a sign, there is another term */
alpar@1:       if (csa->token == T_PLUS || csa->token == T_MINUS) goto loop;
alpar@1:       /* clear marks of the variables used in the linear form */
alpar@1:       for (k = 1; k <= len; k++) csa->flag[csa->ind[k]] = 0;
alpar@1:       /* remove zero coefficients */
alpar@1:       newlen = 0;
alpar@1:       for (k = 1; k <= len; k++)
alpar@1:       {  if (csa->val[k] != 0.0)
alpar@1:          {  newlen++;
alpar@1:             csa->ind[newlen] = csa->ind[k];
alpar@1:             csa->val[newlen] = csa->val[k];
alpar@1:          }
alpar@1:       }
alpar@1:       return newlen;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  parse_objective - parse objective function
alpar@1: *
alpar@1: *  This routine parses definition of the objective function using the
alpar@1: *  following syntax:
alpar@1: *
alpar@1: *  <obj sense> ::= minimize | minimum | min | maximize | maximum | max
alpar@1: *  <obj name> ::= <empty> | <symbolic name> :
alpar@1: *  <obj function> ::= <obj sense> <obj name> <linear form> */
alpar@1: 
alpar@1: static void parse_objective(struct csa *csa)
alpar@1: {     /* parse objective sense */
alpar@1:       int k, len;
alpar@1:       /* parse the keyword 'minimize' or 'maximize' */
alpar@1:       if (csa->token == T_MINIMIZE)
alpar@1:          glp_set_obj_dir(csa->P, GLP_MIN);
alpar@1:       else if (csa->token == T_MAXIMIZE)
alpar@1:          glp_set_obj_dir(csa->P, GLP_MAX);
alpar@1:       else
alpar@1:          xassert(csa != csa);
alpar@1:       scan_token(csa);
alpar@1:       /* parse objective name */
alpar@1:       if (csa->token == T_NAME && csa->c == ':')
alpar@1:       {  /* objective name is followed by a colon */
alpar@1:          glp_set_obj_name(csa->P, csa->image);
alpar@1:          scan_token(csa);
alpar@1:          xassert(csa->token == T_COLON);
alpar@1:          scan_token(csa);
alpar@1:       }
alpar@1:       else
alpar@1:       {  /* objective name is not specified; use default */
alpar@1:          glp_set_obj_name(csa->P, "obj");
alpar@1:       }
alpar@1:       /* parse linear form */
alpar@1:       len = parse_linear_form(csa);
alpar@1:       for (k = 1; k <= len; k++)
alpar@1:          glp_set_obj_coef(csa->P, csa->ind[k], csa->val[k]);
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  parse_constraints - parse constraints section
alpar@1: *
alpar@1: *  This routine parses the constraints section using the following
alpar@1: *  syntax:
alpar@1: *
alpar@1: *  <row name> ::= <empty> | <symbolic name> :
alpar@1: *  <row sense> ::= < | <= | =< | > | >= | => | =
alpar@1: *  <right-hand side> ::= <numeric constant> | + <numeric constant> |
alpar@1: *     - <numeric constant>
alpar@1: *  <constraint> ::= <row name> <linear form> <row sense>
alpar@1: *     <right-hand side>
alpar@1: *  <subject to> ::= subject to | such that | st | s.t. | st.
alpar@1: *  <constraints section> ::= <subject to> <constraint> |
alpar@1: *     <constraints section> <constraint> */
alpar@1: 
alpar@1: static void parse_constraints(struct csa *csa)
alpar@1: {     int i, len, type;
alpar@1:       double s;
alpar@1:       /* parse the keyword 'subject to' */
alpar@1:       xassert(csa->token == T_SUBJECT_TO);
alpar@1:       scan_token(csa);
alpar@1: loop: /* create new row (constraint) */
alpar@1:       i = glp_add_rows(csa->P, 1);
alpar@1:       /* parse row name */
alpar@1:       if (csa->token == T_NAME && csa->c == ':')
alpar@1:       {  /* row name is followed by a colon */
alpar@1:          if (glp_find_row(csa->P, csa->image) != 0)
alpar@1:             error(csa, "constraint `%s' multiply defined\n",
alpar@1:                csa->image);
alpar@1:          glp_set_row_name(csa->P, i, csa->image);
alpar@1:          scan_token(csa);
alpar@1:          xassert(csa->token == T_COLON);
alpar@1:          scan_token(csa);
alpar@1:       }
alpar@1:       else
alpar@1:       {  /* row name is not specified; use default */
alpar@1:          char name[50];
alpar@1:          sprintf(name, "r.%d", csa->count);
alpar@1:          glp_set_row_name(csa->P, i, name);
alpar@1:       }
alpar@1:       /* parse linear form */
alpar@1:       len = parse_linear_form(csa);
alpar@1:       glp_set_mat_row(csa->P, i, len, csa->ind, csa->val);
alpar@1:       /* parse constraint sense */
alpar@1:       if (csa->token == T_LE)
alpar@1:          type = GLP_UP, scan_token(csa);
alpar@1:       else if (csa->token == T_GE)
alpar@1:          type = GLP_LO, scan_token(csa);
alpar@1:       else if (csa->token == T_EQ)
alpar@1:          type = GLP_FX, scan_token(csa);
alpar@1:       else
alpar@1:          error(csa, "missing constraint sense\n");
alpar@1:       /* parse right-hand side */
alpar@1:       if (csa->token == T_PLUS)
alpar@1:          s = +1.0, scan_token(csa);
alpar@1:       else if (csa->token == T_MINUS)
alpar@1:          s = -1.0, scan_token(csa);
alpar@1:       else
alpar@1:          s = +1.0;
alpar@1:       if (csa->token != T_NUMBER)
alpar@1:          error(csa, "missing right-hand side\n");
alpar@1:       glp_set_row_bnds(csa->P, i, type, s * csa->value, s * csa->value);
alpar@1:       /* the rest of the current line must be empty */
alpar@1:       if (!(csa->c == '\n' || csa->c == XEOF))
alpar@1:          error(csa, "invalid symbol(s) beyond right-hand side\n");
alpar@1:       scan_token(csa);
alpar@1:       /* if the next token is a sign, numeric constant, or a symbolic
alpar@1:          name, here is another constraint */
alpar@1:       if (csa->token == T_PLUS || csa->token == T_MINUS ||
alpar@1:           csa->token == T_NUMBER || csa->token == T_NAME) goto loop;
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static void set_lower_bound(struct csa *csa, int j, double lb)
alpar@1: {     /* set lower bound of j-th variable */
alpar@1:       if (csa->lb[j] != +DBL_MAX)
alpar@1:       {  warning(csa, "lower bound of variable `%s' redefined\n",
alpar@1:             glp_get_col_name(csa->P, j));
alpar@1:       }
alpar@1:       csa->lb[j] = lb;
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static void set_upper_bound(struct csa *csa, int j, double ub)
alpar@1: {     /* set upper bound of j-th variable */
alpar@1:       if (csa->ub[j] != -DBL_MAX)
alpar@1:       {  warning(csa, "upper bound of variable `%s' redefined\n",
alpar@1:             glp_get_col_name(csa->P, j));
alpar@1:       }
alpar@1:       csa->ub[j] = ub;
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  parse_bounds - parse bounds section
alpar@1: *
alpar@1: *  This routine parses the bounds section using the following syntax:
alpar@1: *
alpar@1: *  <variable> ::= <symbolic name>
alpar@1: *  <infinity> ::= infinity | inf
alpar@1: *  <bound> ::= <numeric constant> | + <numeric constant> |
alpar@1: *     - <numeric constant> | + <infinity> | - <infinity>
alpar@1: *  <lt> ::= < | <= | =<
alpar@1: *  <gt> ::= > | >= | =>
alpar@1: *  <bound definition> ::= <bound> <lt> <variable> <lt> <bound> |
alpar@1: *     <bound> <lt> <variable> | <variable> <lt> <bound> |
alpar@1: *     <variable> <gt> <bound> | <variable> = <bound> | <variable> free
alpar@1: *  <bounds> ::= bounds | bound
alpar@1: *  <bounds section> ::= <bounds> |
alpar@1: *     <bounds section> <bound definition> */
alpar@1: 
alpar@1: static void parse_bounds(struct csa *csa)
alpar@1: {     int j, lb_flag;
alpar@1:       double lb, s;
alpar@1:       /* parse the keyword 'bounds' */
alpar@1:       xassert(csa->token == T_BOUNDS);
alpar@1:       scan_token(csa);
alpar@1: loop: /* bound definition can start with a sign, numeric constant, or
alpar@1:          a symbolic name */
alpar@1:       if (!(csa->token == T_PLUS || csa->token == T_MINUS ||
alpar@1:             csa->token == T_NUMBER || csa->token == T_NAME)) goto done;
alpar@1:       /* parse bound definition */
alpar@1:       if (csa->token == T_PLUS || csa->token == T_MINUS)
alpar@1:       {  /* parse signed lower bound */
alpar@1:          lb_flag = 1;
alpar@1:          s = (csa->token == T_PLUS ? +1.0 : -1.0);
alpar@1:          scan_token(csa);
alpar@1:          if (csa->token == T_NUMBER)
alpar@1:             lb = s * csa->value, scan_token(csa);
alpar@1:          else if (the_same(csa->image, "infinity") ||
alpar@1:                   the_same(csa->image, "inf"))
alpar@1:          {  if (s > 0.0)
alpar@1:                error(csa, "invalid use of `+inf' as lower bound\n");
alpar@1:             lb = -DBL_MAX, scan_token(csa);
alpar@1:          }
alpar@1:          else
alpar@1:             error(csa, "missing lower bound\n");
alpar@1:       }
alpar@1:       else if (csa->token == T_NUMBER)
alpar@1:       {  /* parse unsigned lower bound */
alpar@1:          lb_flag = 1;
alpar@1:          lb = csa->value, scan_token(csa);
alpar@1:       }
alpar@1:       else
alpar@1:       {  /* lower bound is not specified */
alpar@1:          lb_flag = 0;
alpar@1:       }
alpar@1:       /* parse the token that should follow the lower bound */
alpar@1:       if (lb_flag)
alpar@1:       {  if (csa->token != T_LE)
alpar@1:             error(csa, "missing `<', `<=', or `=<' after lower bound\n")
alpar@1:                ;
alpar@1:          scan_token(csa);
alpar@1:       }
alpar@1:       /* parse variable name */
alpar@1:       if (csa->token != T_NAME)
alpar@1:          error(csa, "missing variable name\n");
alpar@1:       j = find_col(csa, csa->image);
alpar@1:       /* set lower bound */
alpar@1:       if (lb_flag) set_lower_bound(csa, j, lb);
alpar@1:       scan_token(csa);
alpar@1:       /* parse the context that follows the variable name */
alpar@1:       if (csa->token == T_LE)
alpar@1:       {  /* parse upper bound */
alpar@1:          scan_token(csa);
alpar@1:          if (csa->token == T_PLUS || csa->token == T_MINUS)
alpar@1:          {  /* parse signed upper bound */
alpar@1:             s = (csa->token == T_PLUS ? +1.0 : -1.0);
alpar@1:             scan_token(csa);
alpar@1:             if (csa->token == T_NUMBER)
alpar@1:             {  set_upper_bound(csa, j, s * csa->value);
alpar@1:                scan_token(csa);
alpar@1:             }
alpar@1:             else if (the_same(csa->image, "infinity") ||
alpar@1:                      the_same(csa->image, "inf"))
alpar@1:             {  if (s < 0.0)
alpar@1:                   error(csa, "invalid use of `-inf' as upper bound\n");
alpar@1:                set_upper_bound(csa, j, +DBL_MAX);
alpar@1:                scan_token(csa);
alpar@1:             }
alpar@1:             else
alpar@1:                error(csa, "missing upper bound\n");
alpar@1:          }
alpar@1:          else if (csa->token == T_NUMBER)
alpar@1:          {  /* parse unsigned upper bound */
alpar@1:             set_upper_bound(csa, j, csa->value);
alpar@1:             scan_token(csa);
alpar@1:          }
alpar@1:          else
alpar@1:             error(csa, "missing upper bound\n");
alpar@1:       }
alpar@1:       else if (csa->token == T_GE)
alpar@1:       {  /* parse lower bound */
alpar@1:          if (lb_flag)
alpar@1:          {  /* the context '... <= x >= ...' is invalid */
alpar@1:             error(csa, "invalid bound definition\n");
alpar@1:          }
alpar@1:          scan_token(csa);
alpar@1:          if (csa->token == T_PLUS || csa->token == T_MINUS)
alpar@1:          {  /* parse signed lower bound */
alpar@1:             s = (csa->token == T_PLUS ? +1.0 : -1.0);
alpar@1:             scan_token(csa);
alpar@1:             if (csa->token == T_NUMBER)
alpar@1:             {  set_lower_bound(csa, j, s * csa->value);
alpar@1:                scan_token(csa);
alpar@1:             }
alpar@1:             else if (the_same(csa->image, "infinity") ||
alpar@1:                      the_same(csa->image, "inf") == 0)
alpar@1:             {  if (s > 0.0)
alpar@1:                   error(csa, "invalid use of `+inf' as lower bound\n");
alpar@1:                set_lower_bound(csa, j, -DBL_MAX);
alpar@1:                scan_token(csa);
alpar@1:             }
alpar@1:             else
alpar@1:                error(csa, "missing lower bound\n");
alpar@1:          }
alpar@1:          else if (csa->token == T_NUMBER)
alpar@1:          {  /* parse unsigned lower bound */
alpar@1:             set_lower_bound(csa, j, csa->value);
alpar@1:             scan_token(csa);
alpar@1:          }
alpar@1:          else
alpar@1:             error(csa, "missing lower bound\n");
alpar@1:       }
alpar@1:       else if (csa->token == T_EQ)
alpar@1:       {  /* parse fixed value */
alpar@1:          if (lb_flag)
alpar@1:          {  /* the context '... <= x = ...' is invalid */
alpar@1:             error(csa, "invalid bound definition\n");
alpar@1:          }
alpar@1:          scan_token(csa);
alpar@1:          if (csa->token == T_PLUS || csa->token == T_MINUS)
alpar@1:          {  /* parse signed fixed value */
alpar@1:             s = (csa->token == T_PLUS ? +1.0 : -1.0);
alpar@1:             scan_token(csa);
alpar@1:             if (csa->token == T_NUMBER)
alpar@1:             {  set_lower_bound(csa, j, s * csa->value);
alpar@1:                set_upper_bound(csa, j, s * csa->value);
alpar@1:                scan_token(csa);
alpar@1:             }
alpar@1:             else
alpar@1:                error(csa, "missing fixed value\n");
alpar@1:          }
alpar@1:          else if (csa->token == T_NUMBER)
alpar@1:          {  /* parse unsigned fixed value */
alpar@1:             set_lower_bound(csa, j, csa->value);
alpar@1:             set_upper_bound(csa, j, csa->value);
alpar@1:             scan_token(csa);
alpar@1:          }
alpar@1:          else
alpar@1:             error(csa, "missing fixed value\n");
alpar@1:       }
alpar@1:       else if (the_same(csa->image, "free"))
alpar@1:       {  /* parse the keyword 'free' */
alpar@1:          if (lb_flag)
alpar@1:          {  /* the context '... <= x free ...' is invalid */
alpar@1:             error(csa, "invalid bound definition\n");
alpar@1:          }
alpar@1:          set_lower_bound(csa, j, -DBL_MAX);
alpar@1:          set_upper_bound(csa, j, +DBL_MAX);
alpar@1:          scan_token(csa);
alpar@1:       }
alpar@1:       else if (!lb_flag)
alpar@1:       {  /* neither lower nor upper bounds are specified */
alpar@1:          error(csa, "invalid bound definition\n");
alpar@1:       }
alpar@1:       goto loop;
alpar@1: done: return;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  parse_integer - parse general, integer, or binary section
alpar@1: *
alpar@1: *  <variable> ::= <symbolic name>
alpar@1: *  <general> ::= general | generals | gen
alpar@1: *  <integer> ::= integer | integers | int
alpar@1: *  <binary> ::= binary | binaries | bin
alpar@1: *  <section head> ::= <general> <integer> <binary>
alpar@1: *  <additional section> ::= <section head> |
alpar@1: *     <additional section> <variable> */
alpar@1: 
alpar@1: static void parse_integer(struct csa *csa)
alpar@1: {     int j, binary;
alpar@1:       /* parse the keyword 'general', 'integer', or 'binary' */
alpar@1:       if (csa->token == T_GENERAL)
alpar@1:          binary = 0, scan_token(csa);
alpar@1:       else if (csa->token == T_INTEGER)
alpar@1:          binary = 0, scan_token(csa);
alpar@1:       else if (csa->token == T_BINARY)
alpar@1:          binary = 1, scan_token(csa);
alpar@1:       else
alpar@1:          xassert(csa != csa);
alpar@1:       /* parse list of variables (may be empty) */
alpar@1:       while (csa->token == T_NAME)
alpar@1:       {  /* find the corresponding column */
alpar@1:          j = find_col(csa, csa->image);
alpar@1:          /* change kind of the variable */
alpar@1:          glp_set_col_kind(csa->P, j, GLP_IV);
alpar@1:          /* set 0-1 bounds for the binary variable */
alpar@1:          if (binary)
alpar@1:          {  set_lower_bound(csa, j, 0.0);
alpar@1:             set_upper_bound(csa, j, 1.0);
alpar@1:          }
alpar@1:          scan_token(csa);
alpar@1:       }
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: int glp_read_lp(glp_prob *P, const glp_cpxcp *parm, const char *fname)
alpar@1: {     /* read problem data in CPLEX LP format */
alpar@1:       glp_cpxcp _parm;
alpar@1:       struct csa _csa, *csa = &_csa;
alpar@1:       int ret;
alpar@1:       xprintf("Reading problem data from `%s'...\n", fname);
alpar@1:       if (parm == NULL)
alpar@1:          glp_init_cpxcp(&_parm), parm = &_parm;
alpar@1:       /* check control parameters */
alpar@1:       check_parm("glp_read_lp", parm);
alpar@1:       /* initialize common storage area */
alpar@1:       csa->P = P;
alpar@1:       csa->parm = parm;
alpar@1:       csa->fname = fname;
alpar@1:       csa->fp = NULL;
alpar@1:       if (setjmp(csa->jump))
alpar@1:       {  ret = 1;
alpar@1:          goto done;
alpar@1:       }
alpar@1:       csa->count = 0;
alpar@1:       csa->c = '\n';
alpar@1:       csa->token = T_EOF;
alpar@1:       csa->image[0] = '\0';
alpar@1:       csa->imlen = 0;
alpar@1:       csa->value = 0.0;
alpar@1:       csa->n_max = 100;
alpar@1:       csa->ind = xcalloc(1+csa->n_max, sizeof(int));
alpar@1:       csa->val = xcalloc(1+csa->n_max, sizeof(double));
alpar@1:       csa->flag = xcalloc(1+csa->n_max, sizeof(char));
alpar@1:       memset(&csa->flag[1], 0, csa->n_max * sizeof(char));
alpar@1:       csa->lb = xcalloc(1+csa->n_max, sizeof(double));
alpar@1:       csa->ub = xcalloc(1+csa->n_max, sizeof(double));
alpar@1:       /* erase problem object */
alpar@1:       glp_erase_prob(P);
alpar@1:       glp_create_index(P);
alpar@1:       /* open input CPLEX LP file */
alpar@1:       csa->fp = xfopen(fname, "r");
alpar@1:       if (csa->fp == NULL)
alpar@1:       {  xprintf("Unable to open `%s' - %s\n", fname, xerrmsg());
alpar@1:          ret = 1;
alpar@1:          goto done;
alpar@1:       }
alpar@1:       /* scan very first token */
alpar@1:       scan_token(csa);
alpar@1:       /* parse definition of the objective function */
alpar@1:       if (!(csa->token == T_MINIMIZE || csa->token == T_MAXIMIZE))
alpar@1:          error(csa, "`minimize' or `maximize' keyword missing\n");
alpar@1:       parse_objective(csa);
alpar@1:       /* parse constraints section */
alpar@1:       if (csa->token != T_SUBJECT_TO)
alpar@1:          error(csa, "constraints section missing\n");
alpar@1:       parse_constraints(csa);
alpar@1:       /* parse optional bounds section */
alpar@1:       if (csa->token == T_BOUNDS) parse_bounds(csa);
alpar@1:       /* parse optional general, integer, and binary sections */
alpar@1:       while (csa->token == T_GENERAL ||
alpar@1:              csa->token == T_INTEGER ||
alpar@1:              csa->token == T_BINARY) parse_integer(csa);
alpar@1:       /* check for the keyword 'end' */
alpar@1:       if (csa->token == T_END)
alpar@1:          scan_token(csa);
alpar@1:       else if (csa->token == T_EOF)
alpar@1:          warning(csa, "keyword `end' missing\n");
alpar@1:       else
alpar@1:          error(csa, "symbol `%s' in wrong position\n", csa->image);
alpar@1:       /* nothing must follow the keyword 'end' (except comments) */
alpar@1:       if (csa->token != T_EOF)
alpar@1:          error(csa, "extra symbol(s) detected beyond `end'\n");
alpar@1:       /* set bounds of variables */
alpar@1:       {  int j, type;
alpar@1:          double lb, ub;
alpar@1:          for (j = 1; j <= P->n; j++)
alpar@1:          {  lb = csa->lb[j];
alpar@1:             ub = csa->ub[j];
alpar@1:             if (lb == +DBL_MAX) lb = 0.0;      /* default lb */
alpar@1:             if (ub == -DBL_MAX) ub = +DBL_MAX; /* default ub */
alpar@1:             if (lb == -DBL_MAX && ub == +DBL_MAX)
alpar@1:                type = GLP_FR;
alpar@1:             else if (ub == +DBL_MAX)
alpar@1:                type = GLP_LO;
alpar@1:             else if (lb == -DBL_MAX)
alpar@1:                type = GLP_UP;
alpar@1:             else if (lb != ub)
alpar@1:                type = GLP_DB;
alpar@1:             else
alpar@1:                type = GLP_FX;
alpar@1:             glp_set_col_bnds(csa->P, j, type, lb, ub);
alpar@1:          }
alpar@1:       }
alpar@1:       /* print some statistics */
alpar@1:       xprintf("%d row%s, %d column%s, %d non-zero%s\n",
alpar@1:          P->m, P->m == 1 ? "" : "s", P->n, P->n == 1 ? "" : "s",
alpar@1:          P->nnz, P->nnz == 1 ? "" : "s");
alpar@1:       if (glp_get_num_int(P) > 0)
alpar@1:       {  int ni = glp_get_num_int(P);
alpar@1:          int nb = glp_get_num_bin(P);
alpar@1:          if (ni == 1)
alpar@1:          {  if (nb == 0)
alpar@1:                xprintf("One variable is integer\n");
alpar@1:             else
alpar@1:                xprintf("One variable is binary\n");
alpar@1:          }
alpar@1:          else
alpar@1:          {  xprintf("%d integer variables, ", ni);
alpar@1:             if (nb == 0)
alpar@1:                xprintf("none");
alpar@1:             else if (nb == 1)
alpar@1:                xprintf("one");
alpar@1:             else if (nb == ni)
alpar@1:                xprintf("all");
alpar@1:             else
alpar@1:                xprintf("%d", nb);
alpar@1:             xprintf(" of which %s binary\n", nb == 1 ? "is" : "are");
alpar@1:          }
alpar@1:       }
alpar@1:       xprintf("%d lines were read\n", csa->count);
alpar@1:       /* problem data has been successfully read */
alpar@1:       glp_delete_index(P);
alpar@1:       glp_sort_matrix(P);
alpar@1:       ret = 0;
alpar@1: done: if (csa->fp != NULL) xfclose(csa->fp);
alpar@1:       xfree(csa->ind);
alpar@1:       xfree(csa->val);
alpar@1:       xfree(csa->flag);
alpar@1:       xfree(csa->lb);
alpar@1:       xfree(csa->ub);
alpar@1:       if (ret != 0) glp_erase_prob(P);
alpar@1:       return ret;
alpar@1: }
alpar@1: 
alpar@1: /***********************************************************************
alpar@1: *  NAME
alpar@1: *
alpar@1: *  glp_write_lp - write problem data in CPLEX LP format
alpar@1: *
alpar@1: *  SYNOPSIS
alpar@1: *
alpar@1: *  int glp_write_lp(glp_prob *P, const glp_cpxcp *parm, const char
alpar@1: *     *fname);
alpar@1: *
alpar@1: *  DESCRIPTION
alpar@1: *
alpar@1: *  The routine glp_write_lp writes problem data in CPLEX LP format to
alpar@1: *  a text file.
alpar@1: *
alpar@1: *  The parameter parm is a pointer to the structure glp_cpxcp, which
alpar@1: *  specifies control parameters used by the routine. If parm is NULL,
alpar@1: *  the routine uses default settings.
alpar@1: *
alpar@1: *  The character string fname specifies a name of the text file to be
alpar@1: *  written.
alpar@1: *
alpar@1: *  RETURNS
alpar@1: *
alpar@1: *  If the operation was successful, the routine glp_write_lp returns
alpar@1: *  zero. Otherwise, it prints an error message and returns non-zero. */
alpar@1: 
alpar@1: #define csa csa1
alpar@1: 
alpar@1: struct csa
alpar@1: {     /* common storage area */
alpar@1:       glp_prob *P;
alpar@1:       /* pointer to problem object */
alpar@1:       const glp_cpxcp *parm;
alpar@1:       /* pointer to control parameters */
alpar@1: };
alpar@1: 
alpar@1: static int check_name(char *name)
alpar@1: {     /* check if specified name is valid for CPLEX LP format */
alpar@1:       if (*name == '.') return 1;
alpar@1:       if (isdigit((unsigned char)*name)) return 1;
alpar@1:       for (; *name; name++)
alpar@1:       {  if (!isalnum((unsigned char)*name) &&
alpar@1:              strchr(CHAR_SET, (unsigned char)*name) == NULL) return 1;
alpar@1:       }
alpar@1:       return 0; /* name is ok */
alpar@1: }
alpar@1: 
alpar@1: static void adjust_name(char *name)
alpar@1: {     /* attempt to adjust specified name to make it valid for CPLEX LP
alpar@1:          format */
alpar@1:       for (; *name; name++)
alpar@1:       {  if (*name == ' ')
alpar@1:             *name = '_';
alpar@1:          else if (*name == '-')
alpar@1:             *name = '~';
alpar@1:          else if (*name == '[')
alpar@1:             *name = '(';
alpar@1:          else if (*name == ']')
alpar@1:             *name = ')';
alpar@1:       }
alpar@1:       return;
alpar@1: }
alpar@1: 
alpar@1: static char *row_name(struct csa *csa, int i, char rname[255+1])
alpar@1: {     /* construct symbolic name of i-th row (constraint) */
alpar@1:       const char *name;
alpar@1:       if (i == 0)
alpar@1:          name = glp_get_obj_name(csa->P);
alpar@1:       else
alpar@1:          name = glp_get_row_name(csa->P, i);
alpar@1:       if (name == NULL) goto fake;
alpar@1:       strcpy(rname, name);
alpar@1:       adjust_name(rname);
alpar@1:       if (check_name(rname)) goto fake;
alpar@1:       return rname;
alpar@1: fake: if (i == 0)
alpar@1:          strcpy(rname, "obj");
alpar@1:       else
alpar@1:          sprintf(rname, "r_%d", i);
alpar@1:       return rname;
alpar@1: }
alpar@1: 
alpar@1: static char *col_name(struct csa *csa, int j, char cname[255+1])
alpar@1: {     /* construct symbolic name of j-th column (variable) */
alpar@1:       const char *name;
alpar@1:       name = glp_get_col_name(csa->P, j);
alpar@1:       if (name == NULL) goto fake;
alpar@1:       strcpy(cname, name);
alpar@1:       adjust_name(cname);
alpar@1:       if (check_name(cname)) goto fake;
alpar@1:       return cname;
alpar@1: fake: sprintf(cname, "x_%d", j);
alpar@1:       return cname;
alpar@1: }
alpar@1: 
alpar@1: int glp_write_lp(glp_prob *P, const glp_cpxcp *parm, const char *fname)
alpar@1: {     /* write problem data in CPLEX LP format */
alpar@1:       glp_cpxcp _parm;
alpar@1:       struct csa _csa, *csa = &_csa;
alpar@1:       XFILE *fp;
alpar@1:       GLPROW *row;
alpar@1:       GLPCOL *col;
alpar@1:       GLPAIJ *aij;
alpar@1:       int i, j, len, flag, count, ret;
alpar@1:       char line[1000+1], term[500+1], name[255+1];
alpar@1:       xprintf("Writing problem data to `%s'...\n", fname);
alpar@1:       if (parm == NULL)
alpar@1:          glp_init_cpxcp(&_parm), parm = &_parm;
alpar@1:       /* check control parameters */
alpar@1:       check_parm("glp_write_lp", parm);
alpar@1:       /* initialize common storage area */
alpar@1:       csa->P = P;
alpar@1:       csa->parm = parm;
alpar@1:       /* create output CPLEX LP file */
alpar@1:       fp = xfopen(fname, "w"), count = 0;
alpar@1:       if (fp == NULL)
alpar@1:       {  xprintf("Unable to create `%s' - %s\n", fname, xerrmsg());
alpar@1:          ret = 1;
alpar@1:          goto done;
alpar@1:       }
alpar@1:       /* write problem name */
alpar@1:       xfprintf(fp, "\\* Problem: %s *\\\n",
alpar@1:          P->name == NULL ? "Unknown" : P->name), count++;
alpar@1:       xfprintf(fp, "\n"), count++;
alpar@1:       /* the problem should contain at least one row and one column */
alpar@1:       if (!(P->m > 0 && P->n > 0))
alpar@1:       {  xprintf("Warning: problem has no rows/columns\n");
alpar@1:          xfprintf(fp, "\\* WARNING: PROBLEM HAS NO ROWS/COLUMNS *\\\n"),
alpar@1:             count++;
alpar@1:          xfprintf(fp, "\n"), count++;
alpar@1:          goto skip;
alpar@1:       }
alpar@1:       /* write the objective function definition */
alpar@1:       if (P->dir == GLP_MIN)
alpar@1:          xfprintf(fp, "Minimize\n"), count++;
alpar@1:       else if (P->dir == GLP_MAX)
alpar@1:          xfprintf(fp, "Maximize\n"), count++;
alpar@1:       else
alpar@1:          xassert(P != P);
alpar@1:       row_name(csa, 0, name);
alpar@1:       sprintf(line, " %s:", name);
alpar@1:       len = 0;
alpar@1:       for (j = 1; j <= P->n; j++)
alpar@1:       {  col = P->col[j];
alpar@1:          if (col->coef != 0.0 || col->ptr == NULL)
alpar@1:          {  len++;
alpar@1:             col_name(csa, j, name);
alpar@1:             if (col->coef == 0.0)
alpar@1:                sprintf(term, " + 0 %s", name); /* empty column */
alpar@1:             else if (col->coef == +1.0)
alpar@1:                sprintf(term, " + %s", name);
alpar@1:             else if (col->coef == -1.0)
alpar@1:                sprintf(term, " - %s", name);
alpar@1:             else if (col->coef > 0.0)
alpar@1:                sprintf(term, " + %.*g %s", DBL_DIG, +col->coef, name);
alpar@1:             else
alpar@1:                sprintf(term, " - %.*g %s", DBL_DIG, -col->coef, name);
alpar@1:             if (strlen(line) + strlen(term) > 72)
alpar@1:                xfprintf(fp, "%s\n", line), line[0] = '\0', count++;
alpar@1:             strcat(line, term);
alpar@1:          }
alpar@1:       }
alpar@1:       if (len == 0)
alpar@1:       {  /* empty objective */
alpar@1:          sprintf(term, " 0 %s", col_name(csa, 1, name));
alpar@1:          strcat(line, term);
alpar@1:       }
alpar@1:       xfprintf(fp, "%s\n", line), count++;
alpar@1:       if (P->c0 != 0.0)
alpar@1:          xfprintf(fp, "\\* constant term = %.*g *\\\n", DBL_DIG, P->c0),
alpar@1:             count++;
alpar@1:       xfprintf(fp, "\n"), count++;
alpar@1:       /* write the constraints section */
alpar@1:       xfprintf(fp, "Subject To\n"), count++;
alpar@1:       for (i = 1; i <= P->m; i++)
alpar@1:       {  row = P->row[i];
alpar@1:          if (row->type == GLP_FR) continue; /* skip free row */
alpar@1:          row_name(csa, i, name);
alpar@1:          sprintf(line, " %s:", name);
alpar@1:          /* linear form */
alpar@1:          for (aij = row->ptr; aij != NULL; aij = aij->r_next)
alpar@1:          {  col_name(csa, aij->col->j, name);
alpar@1:             if (aij->val == +1.0)
alpar@1:                sprintf(term, " + %s", name);
alpar@1:             else if (aij->val == -1.0)
alpar@1:                sprintf(term, " - %s", name);
alpar@1:             else if (aij->val > 0.0)
alpar@1:                sprintf(term, " + %.*g %s", DBL_DIG, +aij->val, name);
alpar@1:             else
alpar@1:                sprintf(term, " - %.*g %s", DBL_DIG, -aij->val, name);
alpar@1:             if (strlen(line) + strlen(term) > 72)
alpar@1:                xfprintf(fp, "%s\n", line), line[0] = '\0', count++;
alpar@1:             strcat(line, term);
alpar@1:          }
alpar@1:          if (row->type == GLP_DB)
alpar@1:          {  /* double-bounded (ranged) constraint */
alpar@1:             sprintf(term, " - ~r_%d", i);
alpar@1:             if (strlen(line) + strlen(term) > 72)
alpar@1:                xfprintf(fp, "%s\n", line), line[0] = '\0', count++;
alpar@1:             strcat(line, term);
alpar@1:          }
alpar@1:          else if (row->ptr == NULL)
alpar@1:          {  /* empty constraint */
alpar@1:             sprintf(term, " 0 %s", col_name(csa, 1, name));
alpar@1:             strcat(line, term);
alpar@1:          }
alpar@1:          /* right hand-side */
alpar@1:          if (row->type == GLP_LO)
alpar@1:             sprintf(term, " >= %.*g", DBL_DIG, row->lb);
alpar@1:          else if (row->type == GLP_UP)
alpar@1:             sprintf(term, " <= %.*g", DBL_DIG, row->ub);
alpar@1:          else if (row->type == GLP_DB || row->type == GLP_FX)
alpar@1:             sprintf(term, " = %.*g", DBL_DIG, row->lb);
alpar@1:          else
alpar@1:             xassert(row != row);
alpar@1:          if (strlen(line) + strlen(term) > 72)
alpar@1:             xfprintf(fp, "%s\n", line), line[0] = '\0', count++;
alpar@1:          strcat(line, term);
alpar@1:          xfprintf(fp, "%s\n", line), count++;
alpar@1:       }
alpar@1:       xfprintf(fp, "\n"), count++;
alpar@1:       /* write the bounds section */
alpar@1:       flag = 0;
alpar@1:       for (i = 1; i <= P->m; i++)
alpar@1:       {  row = P->row[i];
alpar@1:          if (row->type != GLP_DB) continue;
alpar@1:          if (!flag)
alpar@1:             xfprintf(fp, "Bounds\n"), flag = 1, count++;
alpar@1:          xfprintf(fp, " 0 <= ~r_%d <= %.*g\n",
alpar@1:             i, DBL_DIG, row->ub - row->lb), count++;
alpar@1:       }
alpar@1:       for (j = 1; j <= P->n; j++)
alpar@1:       {  col = P->col[j];
alpar@1:          if (col->type == GLP_LO && col->lb == 0.0) continue;
alpar@1:          if (!flag)
alpar@1:             xfprintf(fp, "Bounds\n"), flag = 1, count++;
alpar@1:          col_name(csa, j, name);
alpar@1:          if (col->type == GLP_FR)
alpar@1:             xfprintf(fp, " %s free\n", name), count++;
alpar@1:          else if (col->type == GLP_LO)
alpar@1:             xfprintf(fp, " %s >= %.*g\n",
alpar@1:                name, DBL_DIG, col->lb), count++;
alpar@1:          else if (col->type == GLP_UP)
alpar@1:             xfprintf(fp, " -Inf <= %s <= %.*g\n",
alpar@1:                name, DBL_DIG, col->ub), count++;
alpar@1:          else if (col->type == GLP_DB)
alpar@1:             xfprintf(fp, " %.*g <= %s <= %.*g\n",
alpar@1:                DBL_DIG, col->lb, name, DBL_DIG, col->ub), count++;
alpar@1:          else if (col->type == GLP_FX)
alpar@1:             xfprintf(fp, " %s = %.*g\n",
alpar@1:                name, DBL_DIG, col->lb), count++;
alpar@1:          else
alpar@1:             xassert(col != col);
alpar@1:       }
alpar@1:       if (flag) xfprintf(fp, "\n"), count++;
alpar@1:       /* write the integer section */
alpar@1:       flag = 0;
alpar@1:       for (j = 1; j <= P->n; j++)
alpar@1:       {  col = P->col[j];
alpar@1:          if (col->kind == GLP_CV) continue;
alpar@1:          xassert(col->kind == GLP_IV);
alpar@1:          if (!flag)
alpar@1:             xfprintf(fp, "Generals\n"), flag = 1, count++;
alpar@1:          xfprintf(fp, " %s\n", col_name(csa, j, name)), count++;
alpar@1:       }
alpar@1:       if (flag) xfprintf(fp, "\n"), count++;
alpar@1: skip: /* write the end keyword */
alpar@1:       xfprintf(fp, "End\n"), count++;
alpar@1:       xfflush(fp);
alpar@1:       if (xferror(fp))
alpar@1:       {  xprintf("Write error on `%s' - %s\n", fname, xerrmsg());
alpar@1:          ret = 1;
alpar@1:          goto done;
alpar@1:       }
alpar@1:       /* problem data has been successfully written */
alpar@1:       xprintf("%d lines were written\n", count);
alpar@1:       ret = 0;
alpar@1: done: if (fp != NULL) xfclose(fp);
alpar@1:       return ret;
alpar@1: }
alpar@1: 
alpar@1: /* eof */