1 files changed, 61 insertions, 0 deletions
diff --git a/lib/padstr.c b/lib/padstr.c
new file mode 100644
index 0000000..b83229f
--- /dev/null
+++ b/lib/padstr.c
@@ -0,0 +1,61 @@
+/**
+** @file	padstr.c
+**
+** @author	Numerous CSCI-452 classes
+**
+** @brief	C implementations of common library functions
+*/
+
+#ifndef PADSTR_SRC_INC
+#define PADSTR_SRC_INC
+
+#include <common.h>
+
+#include <lib.h>
+
+/**
+** padstr(dst,str,len,width,leftadjust,padchar - add padding characters
+**                                               to a string
+**
+** @param dst        The destination buffer
+** @param str        The string to be padded
+** @param len        The string length, or -1
+** @param width      The desired final length of the string
+** @param leftadjust Should the string be left-justified?
+** @param padchar    What character to pad with
+**
+** @return Pointer to the first byte after the padded string
+**
+** NOTE: does NOT NUL-terminate the buffer
+*/
+char *padstr( char *dst, char *str, int len, int width,
+				int leftadjust, int padchar ) {
+	int extra;
+
+	// determine the length of the string if we need to
+	if( len < 0 ){
+		len = strlen( str );
+	}
+
+	// how much filler must we add?
+	extra = width - len;
+
+	// add filler on the left if we're not left-justifying
+	if( extra > 0 && !leftadjust ){
+		dst = pad( dst, extra, padchar );
+	}
+
+	// copy the string itself
+	for( int i = 0; i < len; ++i ) {
+		*dst++ = str[i];
+	}
+
+	// add filler on the right if we are left-justifying
+	if( extra > 0 && leftadjust ){
+		dst = pad( dst, extra, padchar );
+	}
+
+	return dst;
+}
+
+#endif