는 당신이 캘리포니아 그러나
/*
* strtol.c --
*
* Source code for the "strtol" library procedure.
*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*/
static const char rcsid[] = "$Header$ SPRITE (Berkeley)";
#include <ctype.h>
extern unsigned long int strtoul(char *string, char **endPtr, int base);
/*
*----------------------------------------------------------------------
*
* strtol --
*
* Convert an ASCII string into an integer.
*
* Results:
* The return value is the integer equivalent of string. If endPtr
* is non-NULL, then *endPtr is filled in with the character
* after the last one that was part of the integer. If string
* doesn't contain a valid integer value, then zero is returned
* and *endPtr is set to string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
long int
strtol(
char *string, /* String of ASCII digits, possibly
* preceded by white space. For bases
* greater than 10, either lower- or
* upper-case digits may be used.
*/
char **endPtr, /* Where to store address of terminating
* character, or NULL. */
int base /* Base for conversion. Must be less
* than 37. If 0, then the base is chosen
* from the leading characters of string:
* "0x" means hex, "0" means octal, anything
* else means decimal.
*/
)
{
register char *p;
int result;
/*
* Skip any leading blanks.
*/
p = string;
while (isspace(*p)) {
p += 1;
}
/*
* Check for a sign.
*/
if (*p == '-') {
p += 1;
result = -1*(strtoul(p, endPtr, base));
} else {
if (*p == '+') {
p += 1;
}
result = strtoul(p, endPtr, base);
}
if ((result == 0) && (endPtr != 0) && (*endPtr == p)) {
*endPtr = string;
}
return result;
}
"끝이없는"공백 문자열에는 끝이없는 메모리가 필요합니다. [Here] (ftp://ftp.irisa.fr/pub/OpenBSD/src/sys/lib/libsa/strtol.c)는 구현의 한 예입니다. 너무 많은 숫자를 읽지 않는 것이 현명합니다. – user786653
대부분의 라이브러리 함수에서와 마찬가지로 strtol에 제공 한 인수를 확인해야합니다. 예 : 1. 인수는 문자열이어야합니다 (즉, 종료되어야합니다). 그리고 그것이 당신에 관한 것이라면, 당신이 무한한 긴 문자열을주지 않았는지 확인하십시오. – nos
사용자 입력을 읽기 위해'fgets()'(와'sscanf()')를 사용하십시오! – pmg