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/* str2int.c (convert string to int) */
/***********************************************************************
* This code is part of GLPK (GNU Linear Programming Kit).
* Copyright (C) 2000 Free Software Foundation, Inc.
* Written by Andrew Makhorin <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 "misc.h"
#include "stdc.h"
/***********************************************************************
* NAME
*
* str2int - convert character string to value of int type
*
* SYNOPSIS
*
* #include "misc.h"
* int str2int(const char *str, int *val);
*
* DESCRIPTION
*
* The routine str2int converts the character string str to a value of
* integer type and stores the value into location, which the parameter
* val points to (in the case of error content of this location is not
* changed).
*
* RETURNS
*
* The routine returns one of the following error codes:
*
* 0 - no error;
* 1 - value out of range;
* 2 - character string is syntactically incorrect. */
int str2int(const char *str, int *val_)
{ int d, k, s, val = 0;
/* scan optional sign */
if (str[0] == '+')
s = +1, k = 1;
else if (str[0] == '-')
s = -1, k = 1;
else
s = +1, k = 0;
/* check for the first digit */
if (!isdigit((unsigned char)str[k]))
return 2;
/* scan digits */
while (isdigit((unsigned char)str[k]))
{ d = str[k++] - '0';
if (s > 0)
{ if (val > INT_MAX / 10)
return 1;
val *= 10;
if (val > INT_MAX - d)
return 1;
val += d;
}
else /* s < 0 */
{ if (val < INT_MIN / 10)
return 1;
val *= 10;
if (val < INT_MIN + d)
return 1;
val -= d;
}
}
/* check for terminator */
if (str[k] != '\0')
return 2;
/* conversion has been done */
*val_ = val;
return 0;
}
/* eof */
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