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/*
* strutils.c - various string routines shared by commands
* This file was copied from util-linux at fall 2011.
*
* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
* Copyright (C) 2010 Davidlohr Bueso <dave@gnu.org>
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <ctype.h>
#include "c.h"
#include "strutils.h"
/*
* same as strtol(3) but exit on failure instead of returning crap
*/
long strtol_or_err(const char *str, const char *errmesg)
{
long num;
char *end = NULL;
if (str != NULL && *str != '\0') {
errno = 0;
num = strtol(str, &end, 10);
if (errno == 0 && str != end && end != NULL && *end == '\0')
return num;
}
error(EXIT_FAILURE, errno, "%s: '%s'", errmesg, str);
return 0;
}
/*
* same as strtod(3) but exit on failure instead of returning crap
*/
double strtod_or_err(const char *str, const char *errmesg)
{
double num;
char *end = NULL;
if (str != NULL && *str != '\0') {
errno = 0;
num = strtod(str, &end);
if (errno == 0 && str != end && end != NULL && *end == '\0')
return num;
}
error(EXIT_FAILURE, errno, "%s: '%s'", errmesg, str);
return 0;
}
/*
* Covert a string into a double in a non-locale aware way.
* This means the decimal point can be either . or ,
* Also means you cannot use the other for thousands separator
*
* Exits on failure like its other _or_err cousins
*/
double strtod_nol_or_err(char *str, const char *errmesg)
{
double num;
const char *cp, *radix;
double mult;
int negative = 0;
if (str != NULL && *str != '\0') {
num = 0.0;
cp = str;
/* strip leading spaces */
while (isspace(*cp))
cp++;
/* get sign */
if (*cp == '-') {
negative = 1;
cp++;
} else if (*cp == '+')
cp++;
/* find radix */
radix = cp;
mult=0.1;
while(isdigit(*radix)) {
radix++;
mult *= 10;
}
while(isdigit(*cp)) {
num += (*cp - '0') * mult;
mult /= 10;
cp++;
}
/* got the integers */
if (*cp == '\0')
return (negative?-num:num);
if (*cp != '.' && *cp != ',')
error(EXIT_FAILURE, EINVAL, "%s: '%s'", errmesg, str);
cp++;
mult = 0.1;
while(isdigit(*cp)) {
num += (*cp - '0') * mult;
mult /= 10;
cp++;
}
if (*cp == '\0')
return (negative?-num:num);
}
error(EXIT_FAILURE, errno, "%s: '%s'", errmesg, str);
return 0;
}
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