1 files changed, 99 insertions, 0 deletions
diff --git a/file_cmds/csh/strpct.c b/file_cmds/csh/strpct.c
new file mode 100644
index 0000000..ac3b32d
--- /dev/null
+++ b/file_cmds/csh/strpct.c
@@ -0,0 +1,99 @@
+/*	$NetBSD: strpct.c,v 1.2 1998/05/08 18:43:54 fair Exp $	*/
+
+/*-
+ * Copyright (c) 1998 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Erik E. Fair
+ *
+ * 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 NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * Calculate a percentage without resorting to floating point
+ * and return a pointer to a string
+ *
+ * "digits" is the number of digits past the decimal place you want
+ * (zero being the straight percentage with no decimals)
+ *
+ * Erik E. Fair <fair@clock.org>, May 8, 1997
+ */
+
+#include <sys/types.h>
+#include <machine/limits.h>
+
+#include <stdio.h>
+
+char * strpct __P((u_long, u_long, u_int));
+
+char *
+strpct(numerator, denominator, digits)
+	u_long  numerator, denominator;
+	u_int   digits;
+{
+        int i;
+        u_long result, factor;
+        static char     percent[32];
+
+        /* I should check for digit overflow here, too XXX */
+	factor = 100L;
+        for(i = 0; i < digits; i++) {
+                factor *= 10;
+        }
+
+        /* watch out for overflow! */
+        if (numerator < (ULONG_MAX / factor)) {
+                numerator *= factor;
+        } else {
+                /* toss some of the bits of lesser significance */
+                denominator /= factor;
+        }
+
+        if (denominator == 0L)
+                denominator = 1L;
+
+        result = numerator / denominator;
+
+        if (digits == 0) {
+                (void) snprintf(percent, sizeof(percent), "%lu%%", result);
+        } else {
+                char    fmt[32];
+
+                /* indirection to produce the right output format */
+                (void) snprintf(fmt, sizeof(fmt), "%%lu.%%0%ulu%%%%", digits);
+
+                factor /= 100L;         /* undo initialization */
+
+                (void) snprintf(percent, sizeof(percent),
+                        fmt, result / factor, result % factor);
+        }       
+
+        return(percent);
+}