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29 * @(#)getbsize.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gen/getbsize.c,v 1.9 2008/08/04 06:53:13 cperciva Exp $
31 * $DragonFly: src/lib/libc/gen/getbsize.c,v 1.4 2005/11/13 00:07:42 swildner Exp $
40 getbsize(int *headerlenp, long *blocksizep)
42 static char header[20];
43 long n, max, mul, blocksize;
48 #define MB (1024L * 1024L)
49 #define GB (1024L * 1024L * 1024L)
50 #define MAXB GB /* No tera, peta, nor exa. */
52 if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
53 if ((n = strtol(p, &ep, 10)) < 0)
80 fmterr: warnx("%s: unknown blocksize", p);
87 warnx("maximum blocksize is %ldG", MAXB / GB);
90 if ((blocksize = n * mul) < 512) {
91 underflow: warnx("minimum blocksize is 512");
98 snprintf(header, sizeof(header), "%ld%s-blocks", n, form);
99 *headerlenp = strlen(header);
100 *blocksizep = blocksize;