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/* dimacs.c (reading data in DIMACS format) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
*
* Copyright (C) 2009-2015 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 "dimacs.h"
void dmx_error(DMX *csa, const char *fmt, ...)
{ /* print error message and terminate processing */
va_list arg;
xprintf("%s:%d: error: ", csa->fname, csa->count);
va_start(arg, fmt);
xvprintf(fmt, arg);
va_end(arg);
xprintf("\n");
longjmp(csa->jump, 1);
/* no return */
}
void dmx_warning(DMX *csa, const char *fmt, ...)
{ /* print warning message and continue processing */
va_list arg;
xprintf("%s:%d: warning: ", csa->fname, csa->count);
va_start(arg, fmt);
xvprintf(fmt, arg);
va_end(arg);
xprintf("\n");
return;
}
void dmx_read_char(DMX *csa)
{ /* read character from input text file */
int c;
if (csa->c == '\n') csa->count++;
c = glp_getc(csa->fp);
if (c < 0)
{ if (glp_ioerr(csa->fp))
dmx_error(csa, "read error - %s", get_err_msg());
else if (csa->c == '\n')
dmx_error(csa, "unexpected end of file");
else
{ dmx_warning(csa, "missing final end of line");
c = '\n';
}
}
else if (c == '\n')
;
else if (isspace(c))
c = ' ';
else if (iscntrl(c))
dmx_error(csa, "invalid control character 0x%02X", c);
csa->c = c;
return;
}
void dmx_read_designator(DMX *csa)
{ /* read one-character line designator */
xassert(csa->c == '\n');
dmx_read_char(csa);
for (;;)
{ /* skip preceding white-space characters */
while (csa->c == ' ')
dmx_read_char(csa);
if (csa->c == '\n')
{ /* ignore empty line */
if (!csa->empty)
{ dmx_warning(csa, "empty line ignored");
csa->empty = 1;
}
dmx_read_char(csa);
}
else if (csa->c == 'c')
{ /* skip comment line */
while (csa->c != '\n')
dmx_read_char(csa);
dmx_read_char(csa);
}
else
{ /* hmm... looks like a line designator */
csa->field[0] = (char)csa->c, csa->field[1] = '\0';
/* check that it is followed by a white-space character */
dmx_read_char(csa);
if (!(csa->c == ' ' || csa->c == '\n'))
dmx_error(csa, "line designator missing or invalid");
break;
}
}
return;
}
void dmx_read_field(DMX *csa)
{ /* read data field */
int len = 0;
/* skip preceding white-space characters */
while (csa->c == ' ')
dmx_read_char(csa);
/* scan data field */
if (csa->c == '\n')
dmx_error(csa, "unexpected end of line");
while (!(csa->c == ' ' || csa->c == '\n'))
{ if (len == sizeof(csa->field)-1)
dmx_error(csa, "data field '%.15s...' too long",
csa->field);
csa->field[len++] = (char)csa->c;
dmx_read_char(csa);
}
csa->field[len] = '\0';
return;
}
void dmx_end_of_line(DMX *csa)
{ /* skip white-space characters until end of line */
while (csa->c == ' ')
dmx_read_char(csa);
if (csa->c != '\n')
dmx_error(csa, "too many data fields specified");
return;
}
void dmx_check_int(DMX *csa, double num)
{ /* print a warning if non-integer data are detected */
if (!csa->nonint && num != floor(num))
{ dmx_warning(csa, "non-integer data detected");
csa->nonint = 1;
}
return;
}
/* eof */
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