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