projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 6c1d546f KB |
1 | /* |
| 2 | * Copyright (c) 1988 Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms are permitted | |
| 6 | * provided that the above copyright notice and this paragraph are | |
| 7 | * duplicated in all such forms and that any documentation, | |
| 8 | * advertising materials, and other materials related to such | |
| 9 | * distribution and use acknowledge that the software was developed | |
| 10 | * by the University of California, Berkeley. The name of the | |
| 11 | * University may not be used to endorse or promote products derived | |
| 12 | * from this software without specific prior written permission. | |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
| 16 | */ | |
| 17 | ||
| 18 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 19 | static char sccsid[] = "@(#)strtol.c 5.1 (Berkeley) %G%"; | |
| 20 | #endif /* LIBC_SCCS and not lint */ | |
| 21 | ||
| 22 | #include <ctype.h> | |
| 23 | ||
| 24 | long | |
| 25 | strtol(ascii, endp, base) | |
| 26 | register char *ascii; | |
| 27 | char **endp; | |
| 28 | register int base; | |
| 29 | { | |
| 30 | register long val; | |
| 31 | register int c; | |
| 32 | int negative; | |
| 33 | ||
| 34 | for (; isascii(*ascii) && isspace(*ascii); ++ascii); | |
| 35 | ||
| 36 | negative = 0; | |
| 37 | if (*ascii == '+') | |
| 38 | ++ascii; | |
| 39 | else if (*ascii == '-') { | |
| 40 | negative = 1; | |
| 41 | ++ascii; | |
| 42 | } | |
| 43 | ||
| 44 | /* | |
| 45 | * ``If base is positive, but not greater than 36, it is used as | |
| 46 | * the base for the conversion.'' | |
| 47 | * -- The UNIX System User's Manual, 1986 | |
| 48 | */ | |
| 49 | if ((unsigned int)base > 36) | |
| 50 | base = 10; | |
| 51 | else if (base == 0) | |
| 52 | if (*ascii == '0') { | |
| 53 | ++ascii; | |
| 54 | if (*ascii == 'X' || *ascii == 'x') { | |
| 55 | ++ascii; | |
| 56 | base = 16; | |
| 57 | } | |
| 58 | else | |
| 59 | base = 8; | |
| 60 | } | |
| 61 | else | |
| 62 | base = 10; | |
| 63 | else if (base == 16 && *ascii == '0' && | |
| 64 | (*++ascii == 'X' || *ascii == 'x')) | |
| 65 | ++ascii; | |
| 66 | ||
| 67 | for (val = 0; isascii(c = *ascii) && isalnum(c); ++ascii) { | |
| 68 | if (isdigit(c)) | |
| 69 | c -= '0'; | |
| 70 | else { | |
| 71 | if (isupper(c)) | |
| 72 | c = tolower(c); | |
| 73 | c = c - 'a' + 10; | |
| 74 | } | |
| 75 | if (c >= base) | |
| 76 | break; | |
| 77 | val = val * base + c; | |
| 78 | } | |
| 79 | if (endp) | |
| 80 | *endp = ascii; | |
| 81 | return(negative ? -val : val); | |
| 82 | } |