| /* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc. |
| |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the GNU C Library; see the file COPYING.LIB. If |
| not, write to the Free Software Foundation, Inc., 675 Mass Ave, |
| Cambridge, MA 02110-1301, USA. */ |
| |
| #include <ctype.h> |
| #include <limits.h> |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <errno.h> |
| |
| #ifndef UNSIGNED |
| #define UNSIGNED 0 |
| #endif |
| |
| /* Convert NPTR to an `unsigned long int' or `long int' in base BASE. |
| If BASE is 0 the base is determined by the presence of a leading |
| zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal. |
| If BASE is < 2 or > 36, it is reset to 10. |
| If ENDPTR is not NULL, a pointer to the character after the last |
| one converted is stored in *ENDPTR. */ |
| #if UNSIGNED |
| unsigned long int |
| #define strtol strtoul |
| #else |
| long int |
| #endif |
| strtol (nptr, endptr, base) |
| const char *nptr; |
| char **endptr; |
| int base; |
| { |
| int negative; |
| register unsigned long int cutoff; |
| register unsigned int cutlim; |
| register unsigned long int i; |
| register const char *s; |
| register unsigned char c; |
| const char *save; |
| int overflow; |
| |
| if (base < 0 || base == 1 || base > 36) |
| base = 10; |
| |
| s = nptr; |
| |
| /* Skip white space. */ |
| while (isspace (*s)) |
| ++s; |
| if (*s == '\0') |
| goto noconv; |
| |
| /* Check for a sign. */ |
| if (*s == '-') |
| { |
| negative = 1; |
| ++s; |
| } |
| else if (*s == '+') |
| { |
| negative = 0; |
| ++s; |
| } |
| else |
| negative = 0; |
| |
| if (base == 16 && s[0] == '0' && toupper (s[1]) == 'X') |
| s += 2; |
| |
| /* If BASE is zero, figure it out ourselves. */ |
| if (base == 0) |
| if (*s == '0') |
| { |
| if (toupper (s[1]) == 'X') |
| { |
| s += 2; |
| base = 16; |
| } |
| else |
| base = 8; |
| } |
| else |
| base = 10; |
| |
| /* Save the pointer so we can check later if anything happened. */ |
| save = s; |
| |
| cutoff = ULONG_MAX / (unsigned long int) base; |
| cutlim = ULONG_MAX % (unsigned long int) base; |
| |
| overflow = 0; |
| i = 0; |
| for (c = *s; c != '\0'; c = *++s) |
| { |
| if (isdigit (c)) |
| c -= '0'; |
| else if (isalpha (c)) |
| c = toupper (c) - 'A' + 10; |
| else |
| break; |
| if (c >= base) |
| break; |
| /* Check for overflow. */ |
| if (i > cutoff || (i == cutoff && c > cutlim)) |
| overflow = 1; |
| else |
| { |
| i *= (unsigned long int) base; |
| i += c; |
| } |
| } |
| |
| /* Check if anything actually happened. */ |
| if (s == save) |
| goto noconv; |
| |
| /* Store in ENDPTR the address of one character |
| past the last character we converted. */ |
| if (endptr != NULL) |
| *endptr = (char *) s; |
| |
| #if !UNSIGNED |
| /* Check for a value that is within the range of |
| `unsigned long int', but outside the range of `long int'. */ |
| if (i > (negative ? |
| -(unsigned long int) LONG_MIN : (unsigned long int) LONG_MAX)) |
| overflow = 1; |
| #endif |
| |
| if (overflow) |
| { |
| errno = ERANGE; |
| #if UNSIGNED |
| return ULONG_MAX; |
| #else |
| return negative ? LONG_MIN : LONG_MAX; |
| #endif |
| } |
| |
| /* Return the result of the appropriate sign. */ |
| return (negative ? -i : i); |
| |
| noconv: |
| /* There was no number to convert. */ |
| if (endptr != NULL) |
| *endptr = (char *) nptr; |
| return 0L; |
| } |