mirror of
https://github.com/python/cpython.git
synced 2025-11-03 07:01:21 +00:00
151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
|
|
#include "Python.h"
|
|
|
|
#if defined(__sgi) && defined(WITH_THREAD) && !defined(_SGI_MP_SOURCE)
|
|
#define _SGI_MP_SOURCE
|
|
#endif
|
|
|
|
/* Convert a possibly signed character to a nonnegative int */
|
|
/* XXX This assumes characters are 8 bits wide */
|
|
#ifdef __CHAR_UNSIGNED__
|
|
#define Py_CHARMASK(c) (c)
|
|
#else
|
|
#define Py_CHARMASK(c) ((c) & 0xff)
|
|
#endif
|
|
|
|
/* strtol and strtoul, renamed to avoid conflicts */
|
|
|
|
/*
|
|
** strtoul
|
|
** This is a general purpose routine for converting
|
|
** an ascii string to an integer in an arbitrary base.
|
|
** Leading white space is ignored. If 'base' is zero
|
|
** it looks for a leading 0, 0x or 0X to tell which
|
|
** base. If these are absent it defaults to 10.
|
|
** Base must be 0 or between 2 and 36 (inclusive).
|
|
** If 'ptr' is non-NULL it will contain a pointer to
|
|
** the end of the scan.
|
|
** Errors due to bad pointers will probably result in
|
|
** exceptions - we don't check for them.
|
|
*/
|
|
|
|
#include <ctype.h>
|
|
#ifndef DONT_HAVE_ERRNO_H
|
|
#include <errno.h>
|
|
#endif
|
|
|
|
unsigned long
|
|
PyOS_strtoul(register char *str, char **ptr, int base)
|
|
{
|
|
register unsigned long result; /* return value of the function */
|
|
register int c; /* current input character */
|
|
register unsigned long temp; /* used in overflow testing */
|
|
int ovf; /* true if overflow occurred */
|
|
|
|
result = 0;
|
|
ovf = 0;
|
|
|
|
/* catch silly bases */
|
|
if (base != 0 && (base < 2 || base > 36))
|
|
{
|
|
if (ptr)
|
|
*ptr = str;
|
|
return 0;
|
|
}
|
|
|
|
/* skip leading white space */
|
|
while (*str && isspace(Py_CHARMASK(*str)))
|
|
str++;
|
|
|
|
/* check for leading 0 or 0x for auto-base or base 16 */
|
|
switch (base)
|
|
{
|
|
case 0: /* look for leading 0, 0x or 0X */
|
|
if (*str == '0')
|
|
{
|
|
str++;
|
|
if (*str == 'x' || *str == 'X')
|
|
{
|
|
str++;
|
|
base = 16;
|
|
}
|
|
else
|
|
base = 8;
|
|
}
|
|
else
|
|
base = 10;
|
|
break;
|
|
|
|
case 16: /* skip leading 0x or 0X */
|
|
if (*str == '0' && (*(str+1) == 'x' || *(str+1) == 'X'))
|
|
str += 2;
|
|
break;
|
|
}
|
|
|
|
/* do the conversion */
|
|
while ((c = Py_CHARMASK(*str)) != '\0')
|
|
{
|
|
if (isdigit(c) && c - '0' < base)
|
|
c -= '0';
|
|
else
|
|
{
|
|
if (isupper(c))
|
|
c = tolower(c);
|
|
if (c >= 'a' && c <= 'z')
|
|
c -= 'a' - 10;
|
|
else /* non-"digit" character */
|
|
break;
|
|
if (c >= base) /* non-"digit" character */
|
|
break;
|
|
}
|
|
temp = result;
|
|
result = result * base + c;
|
|
if(base == 10) {
|
|
if(((long)(result - c) / base != (long)temp)) /* overflow */
|
|
ovf = 1;
|
|
}
|
|
else {
|
|
if ((result - c) / base != temp) /* overflow */
|
|
ovf = 1;
|
|
}
|
|
str++;
|
|
}
|
|
|
|
/* set pointer to point to the last character scanned */
|
|
if (ptr)
|
|
*ptr = str;
|
|
if (ovf)
|
|
{
|
|
result = (unsigned long) ~0L;
|
|
errno = ERANGE;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
long
|
|
PyOS_strtol(char *str, char **ptr, int base)
|
|
{
|
|
long result;
|
|
char sign;
|
|
|
|
while (*str && isspace(Py_CHARMASK(*str)))
|
|
str++;
|
|
|
|
sign = *str;
|
|
if (sign == '+' || sign == '-')
|
|
str++;
|
|
|
|
result = (long) PyOS_strtoul(str, ptr, base);
|
|
|
|
/* Signal overflow if the result appears negative,
|
|
except for the largest negative integer */
|
|
if (result < 0 && !(sign == '-' && result == -result)) {
|
|
errno = ERANGE;
|
|
result = 0x7fffffff;
|
|
}
|
|
|
|
if (sign == '-')
|
|
result = -result;
|
|
|
|
return result;
|
|
}
|