diff -r 823d42546cea -r 8c88756f81b0 util.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/util.c	Tue Sep 13 22:13:02 2011 -0700
@@ -0,0 +1,122 @@
+/* vim: set noet nosta sw=4 ts=4 ft=c : */
+/*
+Copyright (c) 2011, Mahlon E. Smith <mahlon@martini.nu>
+All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * 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.
+
+    * Neither the name of Mahlon E. Smith nor the names of his
+      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 AND 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 "volta.h"
+
+/*
+ * Output basic usage information.
+ */
+void
+usage( char *prg )
+{
+	printf( "%s [-vh] [-d <level>] [-a <init>]\n", prg );
+	printf( "    -v Display version\n" );
+	printf( "    -d <level> Show debug information on stderr\n" );
+	printf( "    -h Usage (you're lookin' at it)\n" );
+	printf( "    -a Perform an action, being one of:\n" );
+	printf( "         init: Initialize a new, empty database\n" );
+	printf( "         dump: DUMP IT\n" );
+	printf( "\n" );
+	return;
+}
+
+
+/*
+ * Debug function, only output to stderr if the debug level is
+ * equal or greater to the set output level.
+ *
+ * 	level: The minimum debug level that must be set for the 
+ * 	       line to be logged.
+ * 	file:  The current code file that is emitting the log
+ * 	line:  The line number of the code file that is emitting the log
+ * 	... :  any printf style strings and formats that constitute the log message
+ */
+void
+debug( int level, char *file, int line, const char *fmt, ... )
+{
+	if ( debugmode < level ) return;
+
+	char timestamp[20];
+	time_t t = time( NULL );
+	struct tm *now = localtime( &t );
+	strftime( timestamp, 20, "%F %T", now );
+
+	va_list args;
+	va_start( args, fmt );
+	fprintf( stderr, "%s [%s] #%d (%s:%04d): ",
+			 PROG, timestamp, getpid(), file, line );
+	vfprintf( stderr, fmt, args );
+	va_end( args );
+
+	return;
+}
+
+
+/*
+ * Append 'buf' to the end of 'line', a la strcat, except dynamically
+ * grow memory for the target string.
+ *
+ * 'buf' should be null terminated.  Returns the modified line.
+ */
+char *
+extend_line( char *line, const char *buf )
+{
+	char *line_realloc;
+
+	unsigned short int offset;
+	size_t new_len;
+
+	/* find offset and lengths, first assignment */
+	if ( line == NULL ) {
+		offset  = 0;
+		new_len = strlen( buf );
+	}
+	/* find offset and lengths, append to existing string */
+	else {
+		offset  = strlen( line ); /* not including '\0' */
+		new_len = offset + LINE_BUFSIZE;
+	}
+
+	debug( 3, LOC, "Extending line to %d bytes at offset %d...\n", new_len, offset );
+	if ( (line_realloc = realloc(line, sizeof(char) * new_len)) == NULL ) {
+		/* cleanup on allocation errors */
+		debug( 3, LOC, "Ignoring line, error while allocating memory: %s\n", strerror(errno) );
+		if ( line != NULL ) free( line );
+		line = NULL;
+	}
+	else {
+		line = line_realloc;
+		memcpy( line + offset, buf, strlen(buf) );
+	}
+
+	return( line );
+}
+