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984263bc MD |
1 | /*- |

2 | * Copyright (c) 1990, 1993 | |

3 | * The Regents of the University of California. All rights reserved. | |

4 | * | |

5 | * This code is derived from software contributed to Berkeley by | |

6 | * Chris Torek. | |

7 | * | |

8 | * Redistribution and use in source and binary forms, with or without | |

9 | * modification, are permitted provided that the following conditions | |

10 | * are met: | |

11 | * 1. Redistributions of source code must retain the above copyright | |

12 | * notice, this list of conditions and the following disclaimer. | |

13 | * 2. Redistributions in binary form must reproduce the above copyright | |

14 | * notice, this list of conditions and the following disclaimer in the | |

15 | * documentation and/or other materials provided with the distribution. | |

16 | * 3. All advertising materials mentioning features or use of this software | |

17 | * must display the following acknowledgement: | |

18 | * This product includes software developed by the University of | |

19 | * California, Berkeley and its contributors. | |

20 | * 4. Neither the name of the University nor the names of its contributors | |

21 | * may be used to endorse or promote products derived from this software | |

22 | * without specific prior written permission. | |

23 | * | |

24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |

25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |

26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |

27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |

28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |

29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |

30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |

31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |

32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |

33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |

34 | * SUCH DAMAGE. | |

35 | * | |

36 | * From: static char sccsid[] = "@(#)strtoul.c 8.1 (Berkeley) 6/4/93"; | |

37 | * | |

38 | * $FreeBSD: src/sys/libkern/strtoul.c,v 1.3 1999/12/01 22:56:51 archie Exp $ | |

39 | */ | |

40 | ||

41 | #include <sys/param.h> | |

42 | #include <sys/systm.h> | |

43 | #include <sys/ctype.h> | |

44 | #include <machine/limits.h> | |

45 | ||

46 | /* | |

47 | * Convert a string to an unsigned long integer. | |

48 | * | |

49 | * Ignores `locale' stuff. Assumes that the upper and lower case | |

50 | * alphabets and digits are each contiguous. | |

51 | */ | |

52 | unsigned long | |

e73e0a5e | 53 | strtoul(const char *nptr, char **endptr, int base) |

984263bc MD |
54 | { |

55 | const char *s = nptr; | |

56 | unsigned long acc; | |

57 | unsigned char c; | |

58 | unsigned long cutoff; | |

59 | int neg = 0, any, cutlim; | |

60 | ||

61 | /* | |

62 | * See strtol for comments as to the logic used. | |

63 | */ | |

64 | do { | |

65 | c = *s++; | |

66 | } while (isspace(c)); | |

67 | if (c == '-') { | |

68 | neg = 1; | |

69 | c = *s++; | |

70 | } else if (c == '+') | |

71 | c = *s++; | |

72 | if ((base == 0 || base == 16) && | |

73 | c == '0' && (*s == 'x' || *s == 'X')) { | |

74 | c = s[1]; | |

75 | s += 2; | |

76 | base = 16; | |

77 | } | |

78 | if (base == 0) | |

79 | base = c == '0' ? 8 : 10; | |

80 | cutoff = (unsigned long)ULONG_MAX / (unsigned long)base; | |

81 | cutlim = (unsigned long)ULONG_MAX % (unsigned long)base; | |

82 | for (acc = 0, any = 0;; c = *s++) { | |

83 | if (!isascii(c)) | |

84 | break; | |

85 | if (isdigit(c)) | |

86 | c -= '0'; | |

87 | else if (isalpha(c)) | |

88 | c -= isupper(c) ? 'A' - 10 : 'a' - 10; | |

89 | else | |

90 | break; | |

91 | if (c >= base) | |

92 | break; | |

93 | if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim)) | |

94 | any = -1; | |

95 | else { | |

96 | any = 1; | |

97 | acc *= base; | |

98 | acc += c; | |

99 | } | |

100 | } | |

101 | if (any < 0) { | |

102 | acc = ULONG_MAX; | |

103 | } else if (neg) | |

104 | acc = -acc; | |

4090d6ff | 105 | if (endptr != NULL) |

984263bc MD |
106 | *((const char **)endptr) = any ? s - 1 : nptr; |

107 | return (acc); | |

108 | } |