124 lines
3.2 KiB
C
124 lines
3.2 KiB
C
/*
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* strutils.c - various string routines shared by commands
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* This file was copied from util-linux at fall 2011.
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*
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* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
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* Copyright (C) 2010 Davidlohr Bueso <dave@gnu.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include <stdlib.h>
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#include <ctype.h>
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#include "c.h"
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#include "strutils.h"
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/*
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* same as strtol(3) but exit on failure instead of returning crap
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*/
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long strtol_or_err(const char *str, const char *errmesg)
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{
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long num;
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char *end = NULL;
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if (str != NULL && *str != '\0') {
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errno = 0;
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num = strtol(str, &end, 10);
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if (errno == 0 && str != end && end != NULL && *end == '\0')
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return num;
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}
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error(EXIT_FAILURE, errno, "%s: '%s'", errmesg, str);
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return 0;
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}
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/*
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* same as strtod(3) but exit on failure instead of returning crap
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*/
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double strtod_or_err(const char *str, const char *errmesg)
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{
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double num;
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char *end = NULL;
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if (str != NULL && *str != '\0') {
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errno = 0;
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num = strtod(str, &end);
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if (errno == 0 && str != end && end != NULL && *end == '\0')
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return num;
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}
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error(EXIT_FAILURE, errno, "%s: '%s'", errmesg, str);
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return 0;
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}
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/*
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* Covert a string into a double in a non-locale aware way.
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* This means the decimal point can be either . or ,
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* Also means you cannot use the other for thousands separator
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*
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* Exits on failure like its other _or_err cousins
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*/
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double strtod_nol_or_err(char *str, const char *errmesg)
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{
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double num;
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const char *cp, *radix;
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double mult;
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int negative = 0;
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if (str != NULL && *str != '\0') {
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num = 0.0;
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cp = str;
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/* strip leading spaces */
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while (isspace(*cp))
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cp++;
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/* get sign */
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if (*cp == '-') {
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negative = 1;
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cp++;
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} else if (*cp == '+')
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cp++;
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/* find radix */
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radix = cp;
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mult=0.1;
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while(isdigit(*radix)) {
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radix++;
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mult *= 10;
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}
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while(isdigit(*cp)) {
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num += (*cp - '0') * mult;
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mult /= 10;
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cp++;
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}
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/* got the integers */
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if (*cp == '\0')
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return (negative?-num:num);
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if (*cp != '.' && *cp != ',')
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error(EXIT_FAILURE, EINVAL, "%s: '%s'", errmesg, str);
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cp++;
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mult = 0.1;
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while(isdigit(*cp)) {
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num += (*cp - '0') * mult;
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mult /= 10;
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cp++;
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}
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if (*cp == '\0')
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return (negative?-num:num);
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}
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error(EXIT_FAILURE, errno, "%s: '%s'", errmesg, str);
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return 0;
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}
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