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| 1 : | anton | 1.1 | /* Copyright (C) 1991, 1992 Free Software Foundation, Inc. |
| 2 : | This file is part of the GNU C Library. | ||
| 3 : | |||
| 4 : | The GNU C Library is free software; you can redistribute it and/or | ||
| 5 : | modify it under the terms of the GNU Library General Public License as | ||
| 6 : | published by the Free Software Foundation; either version 2 of the | ||
| 7 : | License, or (at your option) any later version. | ||
| 8 : | |||
| 9 : | The GNU C Library is distributed in the hope that it will be useful, | ||
| 10 : | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 : | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 : | Library General Public License for more details. | ||
| 13 : | |||
| 14 : | You should have received a copy of the GNU Library General Public | ||
| 15 : | License along with the GNU C Library; see the file COPYING.LIB. If | ||
| 16 : | not, write to the Free Software Foundation, Inc., 675 Mass Ave, | ||
| 17 : | Cambridge, MA 02139, USA. */ | ||
| 18 : | |||
| 19 : | anton | 1.2 | #include "ansidecl.h" |
| 20 : | anton | 1.1 | #include <ctype.h> |
| 21 : | #include <limits.h> | ||
| 22 : | #include <stddef.h> | ||
| 23 : | #include <stdlib.h> | ||
| 24 : | anton | 1.3 | /* errno.h is needed on SunOS 4.1.2 */ |
| 25 : | #include <errno.h> | ||
| 26 : | anton | 1.1 | |
| 27 : | #ifndef UNSIGNED | ||
| 28 : | #define UNSIGNED 0 | ||
| 29 : | #endif | ||
| 30 : | |||
| 31 : | /* Convert NPTR to an `unsigned long int' or `long int' in base BASE. | ||
| 32 : | If BASE is 0 the base is determined by the presence of a leading | ||
| 33 : | zero, indicating octal or a leading "0x" or "0X", indicating hexadecimal. | ||
| 34 : | If BASE is < 2 or > 36, it is reset to 10. | ||
| 35 : | If ENDPTR is not NULL, a pointer to the character after the last | ||
| 36 : | one converted is stored in *ENDPTR. */ | ||
| 37 : | #if UNSIGNED | ||
| 38 : | unsigned long int | ||
| 39 : | #define strtol strtoul | ||
| 40 : | #else | ||
| 41 : | long int | ||
| 42 : | #endif | ||
| 43 : | DEFUN(strtol, (nptr, endptr, base), | ||
| 44 : | CONST char *nptr AND char **endptr AND int base) | ||
| 45 : | { | ||
| 46 : | int negative; | ||
| 47 : | register unsigned long int cutoff; | ||
| 48 : | register unsigned int cutlim; | ||
| 49 : | register unsigned long int i; | ||
| 50 : | register CONST char *s; | ||
| 51 : | register unsigned char c; | ||
| 52 : | CONST char *save; | ||
| 53 : | int overflow; | ||
| 54 : | |||
| 55 : | if (base < 0 || base == 1 || base > 36) | ||
| 56 : | base = 10; | ||
| 57 : | |||
| 58 : | s = nptr; | ||
| 59 : | |||
| 60 : | /* Skip white space. */ | ||
| 61 : | while (isspace(*s)) | ||
| 62 : | ++s; | ||
| 63 : | if (*s == '\0') | ||
| 64 : | goto noconv; | ||
| 65 : | |||
| 66 : | /* Check for a sign. */ | ||
| 67 : | if (*s == '-') | ||
| 68 : | { | ||
| 69 : | negative = 1; | ||
| 70 : | ++s; | ||
| 71 : | } | ||
| 72 : | else if (*s == '+') | ||
| 73 : | { | ||
| 74 : | negative = 0; | ||
| 75 : | ++s; | ||
| 76 : | } | ||
| 77 : | else | ||
| 78 : | negative = 0; | ||
| 79 : | |||
| 80 : | if (base == 16 && s[0] == '0' && toupper(s[1]) == 'X') | ||
| 81 : | s += 2; | ||
| 82 : | |||
| 83 : | /* If BASE is zero, figure it out ourselves. */ | ||
| 84 : | if (base == 0) | ||
| 85 : | if (*s == '0') | ||
| 86 : | { | ||
| 87 : | if (toupper(s[1]) == 'X') | ||
| 88 : | { | ||
| 89 : | s += 2; | ||
| 90 : | base = 16; | ||
| 91 : | } | ||
| 92 : | else | ||
| 93 : | base = 8; | ||
| 94 : | } | ||
| 95 : | else | ||
| 96 : | base = 10; | ||
| 97 : | |||
| 98 : | /* Save the pointer so we can check later if anything happened. */ | ||
| 99 : | save = s; | ||
| 100 : | |||
| 101 : | cutoff = ULONG_MAX / (unsigned long int) base; | ||
| 102 : | cutlim = ULONG_MAX % (unsigned long int) base; | ||
| 103 : | |||
| 104 : | overflow = 0; | ||
| 105 : | i = 0; | ||
| 106 : | for (c = *s; c != '\0'; c = *++s) | ||
| 107 : | { | ||
| 108 : | if (isdigit(c)) | ||
| 109 : | c -= '0'; | ||
| 110 : | else if (isalpha(c)) | ||
| 111 : | c = toupper(c) - 'A' + 10; | ||
| 112 : | else | ||
| 113 : | break; | ||
| 114 : | if (c >= base) | ||
| 115 : | break; | ||
| 116 : | /* Check for overflow. */ | ||
| 117 : | if (i > cutoff || (i == cutoff && c > cutlim)) | ||
| 118 : | overflow = 1; | ||
| 119 : | else | ||
| 120 : | { | ||
| 121 : | i *= (unsigned long int) base; | ||
| 122 : | i += c; | ||
| 123 : | } | ||
| 124 : | } | ||
| 125 : | |||
| 126 : | /* Check if anything actually happened. */ | ||
| 127 : | if (s == save) | ||
| 128 : | goto noconv; | ||
| 129 : | |||
| 130 : | /* Store in ENDPTR the address of one character | ||
| 131 : | past the last character we converted. */ | ||
| 132 : | if (endptr != NULL) | ||
| 133 : | *endptr = (char *) s; | ||
| 134 : | |||
| 135 : | #if !UNSIGNED | ||
| 136 : | /* Check for a value that is within the range of | ||
| 137 : | `unsigned long int', but outside the range of `long int'. */ | ||
| 138 : | if (i > (negative ? | ||
| 139 : | - (unsigned long int) LONG_MIN : (unsigned long int) LONG_MAX)) | ||
| 140 : | overflow = 1; | ||
| 141 : | #endif | ||
| 142 : | |||
| 143 : | if (overflow) | ||
| 144 : | { | ||
| 145 : | errno = ERANGE; | ||
| 146 : | #if UNSIGNED | ||
| 147 : | return ULONG_MAX; | ||
| 148 : | #else | ||
| 149 : | return negative ? LONG_MIN : LONG_MAX; | ||
| 150 : | #endif | ||
| 151 : | } | ||
| 152 : | |||
| 153 : | /* Return the result of the appropriate sign. */ | ||
| 154 : | return (negative ? - i : i); | ||
| 155 : | |||
| 156 : | noconv: | ||
| 157 : | /* There was no number to convert. */ | ||
| 158 : | if (endptr != NULL) | ||
| 159 : | *endptr = (char *) nptr; | ||
| 160 : | return 0L; | ||
| 161 : | } |
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