projects / micropolis / blame
| Commit | Line | Data |
|---|---|---|
| 6a5fa4e0 MG |
1 | /* |
| 2 | * strtol.c -- | |
| 3 | * | |
| 4 | * Source code for the "strtol" library procedure. | |
| 5 | * | |
| 6 | * Copyright 1988 Regents of the University of California | |
| 7 | * Permission to use, copy, modify, and distribute this | |
| 8 | * software and its documentation for any purpose and without | |
| 9 | * fee is hereby granted, provided that the above copyright | |
| 10 | * notice appear in all copies. The University of California | |
| 11 | * makes no representations about the suitability of this | |
| 12 | * software for any purpose. It is provided "as is" without | |
| 13 | * express or implied warranty. | |
| 14 | */ | |
| 15 | ||
| 16 | #ifndef lint | |
| 17 | static char rcsid[] = "$Header: /sprite/src/lib/tcl/compat/RCS/strtol.c,v 1.1 91/09/22 15:42:49 ouster Exp $ SPRITE (Berkeley)"; | |
| 18 | #endif /* not lint */ | |
| 19 | ||
| 20 | #include <ctype.h> | |
| 21 | ||
| 22 | \f | |
| 23 | /* | |
| 24 | *---------------------------------------------------------------------- | |
| 25 | * | |
| 26 | * strtol -- | |
| 27 | * | |
| 28 | * Convert an ASCII string into an integer. | |
| 29 | * | |
| 30 | * Results: | |
| 31 | * The return value is the integer equivalent of string. If endPtr | |
| 32 | * is non-NULL, then *endPtr is filled in with the character | |
| 33 | * after the last one that was part of the integer. If string | |
| 34 | * doesn't contain a valid integer value, then zero is returned | |
| 35 | * and *endPtr is set to string. | |
| 36 | * | |
| 37 | * Side effects: | |
| 38 | * None. | |
| 39 | * | |
| 40 | *---------------------------------------------------------------------- | |
| 41 | */ | |
| 42 | ||
| 43 | long int | |
| 44 | strtol(string, endPtr, base) | |
| 45 | char *string; /* String of ASCII digits, possibly | |
| 46 | * preceded by white space. For bases | |
| 47 | * greater than 10, either lower- or | |
| 48 | * upper-case digits may be used. | |
| 49 | */ | |
| 50 | char **endPtr; /* Where to store address of terminating | |
| 51 | * character, or NULL. */ | |
| 52 | int base; /* Base for conversion. Must be less | |
| 53 | * than 37. If 0, then the base is chosen | |
| 54 | * from the leading characters of string: | |
| 55 | * "0x" means hex, "0" means octal, anything | |
| 56 | * else means decimal. | |
| 57 | */ | |
| 58 | { | |
| 59 | register char *p; | |
| 60 | int result; | |
| 61 | ||
| 62 | /* | |
| 63 | * Skip any leading blanks. | |
| 64 | */ | |
| 65 | ||
| 66 | p = string; | |
| 67 | while (isspace(*p)) { | |
| 68 | p += 1; | |
| 69 | } | |
| 70 | ||
| 71 | /* | |
| 72 | * Check for a sign. | |
| 73 | */ | |
| 74 | ||
| 75 | if (*p == '-') { | |
| 76 | p += 1; | |
| 77 | result = -(strtoul(p, endPtr, base)); | |
| 78 | } else { | |
| 79 | if (*p == '+') { | |
| 80 | p += 1; | |
| 81 | } | |
| 82 | result = strtoul(p, endPtr, base); | |
| 83 | } | |
| 84 | if ((result == 0) && (endPtr != 0) && (*endPtr == p)) { | |
| 85 | *endPtr = string; | |
| 86 | } | |
| 87 | return result; | |
| 88 | } |