projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 55677287 KB |
1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * %sccs.include.redist.c% | |
| 6 | */ | |
| 7 | ||
| 8 | #ifndef lint | |
| 2dbdf5a9 | 9 | static char sccsid[] = "@(#)getbsize.c 5.4 (Berkeley) %G%"; |
| 55677287 KB |
10 | #endif /* not lint */ |
| 11 | ||
| 12 | #include <stdio.h> | |
| 13 | #include <stdlib.h> | |
| 14 | ||
| 15 | char * | |
| 16 | getbsize(prog, headerlenp, blocksizep) | |
| 17 | char *prog; | |
| aa3d60d7 KB |
18 | int *headerlenp; |
| 19 | long *blocksizep; | |
| 55677287 KB |
20 | { |
| 21 | static char header[20]; | |
| 53732d93 KB |
22 | long n, max, mul, blocksize; |
| 23 | char *ep, *p, *form; | |
| 55677287 | 24 | |
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25 | #define KB (1024L) |
| 26 | #define MB (1024L * 1024L) | |
| 27 | #define GB (1024L * 1024L * 1024L) | |
| 28 | #define MAXB GB /* No tera, peta, nor exa. */ | |
| 29 | form = ""; | |
| 55677287 | 30 | if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') { |
| 53732d93 KB |
31 | if ((n = strtol(p, &ep, 10)) < 0) |
| 32 | goto underflow; | |
| 33 | if (n == 0) | |
| 34 | n = 1; | |
| 35 | if (*ep && ep[1]) | |
| 36 | goto fmterr; | |
| 37 | switch (*ep) { | |
| 55677287 | 38 | case 'G': case 'g': |
| 53732d93 KB |
39 | form = "G"; |
| 40 | max = MAXB / GB; | |
| 41 | mul = GB; | |
| 42 | break; | |
| 55677287 | 43 | case 'K': case 'k': |
| 53732d93 KB |
44 | form = "K"; |
| 45 | max = MAXB / KB; | |
| 46 | mul = KB; | |
| 47 | break; | |
| 48 | case 'M': case 'm': | |
| 49 | form = "M"; | |
| 50 | max = MAXB / MB; | |
| 51 | mul = MB; | |
| 52 | break; | |
| 55677287 | 53 | case '\0': |
| 53732d93 KB |
54 | max = MAXB; |
| 55 | mul = 1; | |
| 55677287 KB |
56 | break; |
| 57 | default: | |
| 58 | fmterr: (void)fprintf(stderr, | |
| 59 | "%s: %s: unknown blocksize\n", prog, p); | |
| 53732d93 KB |
60 | n = 512; |
| 61 | mul = 1; | |
| 55677287 KB |
62 | break; |
| 63 | } | |
| 53732d93 KB |
64 | if (n > max) { |
| 65 | (void)fprintf(stderr, | |
| 66 | "%s: maximum blocksize is %dG\n", prog, MAXB / GB); | |
| 67 | n = max; | |
| 68 | } | |
| 69 | if ((blocksize = n * mul) < 512) { | |
| 70 | underflow: (void)fprintf(stderr, | |
| 71 | "%s: minimum blocksize is 512\n", prog); | |
| 72 | form = ""; | |
| 73 | blocksize = n = 512; | |
| 74 | } | |
| 55677287 | 75 | } else |
| 53732d93 | 76 | blocksize = n = 512; |
| 55677287 | 77 | |
| 2dbdf5a9 KB |
78 | (void)snprintf(header, sizeof(header), "%d%s-blocks", n, form); |
| 79 | *headerlenp = strlen(header); | |
| 55677287 KB |
80 | *blocksizep = blocksize; |
| 81 | return (header); | |
| 82 | } |