1 /* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
3 This program is free software; you can redistribute it and/or modify
4 it under the terms of the GNU General Public License as published by
5 the Free Software Foundation; either version 2, or (at your option)
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
32 #define ULONG_MAX ((unsigned long) ~(unsigned long) 0)
36 #define LONG_MAX (~(1 << (sizeof (long) * 8 - 1)))
40 #define LONG_MIN (-LONG_MAX - 1)
54 /* Convert NPTR to an `unsigned long int' or `long int' in base BASE.
55 If BASE is 0 the base is determined by the presence of a leading
56 zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal.
57 If BASE is < 2 or > 36, it is reset to 10.
58 If ENDPTR is not NULL, a pointer to the character after the last
59 one converted is stored in *ENDPTR. */
62 #define strtol strtoul
66 strtol (nptr, endptr, base)
72 register unsigned long int cutoff;
73 register unsigned int cutlim;
74 register unsigned long int i;
75 register const char *s;
76 register unsigned char c;
80 if (base < 0 || base == 1 || base > 36)
85 /* Skip white space. */
91 /* Check for a sign. */
105 if (base == 16 && s[0] == '0' && toupper (s[1]) == 'X')
108 /* If BASE is zero, figure it out ourselves. */
113 if (toupper (s[1]) == 'X')
125 /* Save the pointer so we can check later if anything happened. */
128 cutoff = ULONG_MAX / (unsigned long int) base;
129 cutlim = ULONG_MAX % (unsigned long int) base;
133 for (c = *s; c != '\0'; c = *++s)
137 else if (isalpha (c))
138 c = toupper (c) - 'A' + 10;
143 /* Check for overflow. */
144 if (i > cutoff || (i == cutoff && c > cutlim))
148 i *= (unsigned long int) base;
153 /* Check if anything actually happened. */
157 /* Store in ENDPTR the address of one character
158 past the last character we converted. */
160 *endptr = (char *) s;
163 /* Check for a value that is within the range of
164 `unsigned long int', but outside the range of `long int'. */
166 -(unsigned long int) LONG_MIN : (unsigned long int) LONG_MAX))
176 return negative ? LONG_MIN : LONG_MAX;
180 /* Return the result of the appropriate sign. */
181 return (negative ? -i : i);
184 /* There was no number to convert. */
186 *endptr = (char *) nptr;