Libc-262.tar.gz

[apple/libc.git] / gen / getbsize.c

diff --git a/gen/getbsize.c b/gen/getbsize.c
new file mode 100644 (file)
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+++ b/gen/getbsize.c
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+/*
+ * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
+ * 
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*
+ * Copyright (c) 1991, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+
+#include <err.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+char *
+getbsize(headerlenp, blocksizep)
+       int *headerlenp;
+       long *blocksizep;
+{
+       static char header[20];
+       long n, max, mul, blocksize;
+       char *ep, *p, *form;
+
+#define        KB      (1024L)
+#define        MB      (1024L * 1024L)
+#define        GB      (1024L * 1024L * 1024L)
+#define        MAXB    GB              /* No tera, peta, nor exa. */
+       form = "";
+       if ((p = getenv("BLOCKSIZE")) != NULL && *p != '\0') {
+               if ((n = strtol(p, &ep, 10)) < 0)
+                       goto underflow;
+               if (n == 0)
+                       n = 1;
+               if (*ep && ep[1])
+                       goto fmterr;
+               switch (*ep) {
+               case 'G': case 'g':
+                       form = "G";
+                       max = MAXB / GB;
+                       mul = GB;
+                       break;
+               case 'K': case 'k':
+                       form = "K";
+                       max = MAXB / KB;
+                       mul = KB;
+                       break;
+               case 'M': case 'm':
+                       form = "M";
+                       max = MAXB / MB;
+                       mul = MB;
+                       break;
+               case '\0':
+                       max = MAXB;
+                       mul = 1;
+                       break;
+               default:
+fmterr:                        warnx("%s: unknown blocksize", p);
+                       n = 512;
+                       mul = 1;
+                       break;
+               }
+               if (n > max) {
+                       warnx("maximum blocksize is %dG", MAXB / GB);
+                       n = max;
+               }
+               if ((blocksize = n * mul) < 512) {
+underflow:             warnx("minimum blocksize is 512");
+                       form = "";
+                       blocksize = n = 512;
+               }
+       } else
+               blocksize = n = 512;
+
+       (void)snprintf(header, sizeof(header), "%d%s-blocks", n, form);
+       *headerlenp = strlen(header);
+       *blocksizep = blocksize;
+       return (header);
+}