initial checkout from wrc

1 files changed, 51 insertions, 0 deletions

diff --git a/lib/str2int.c b/lib/str2int.c
new file mode 100644
index 0000000..c0f777d
--- /dev/null
+++ b/lib/str2int.c
@@ -0,0 +1,51 @@
+/**
+** @file	str2int.c
+**
+** @author	Numerous CSCI-452 classes
+**
+** @brief	C implementations of common library functions
+*/
+
+#ifndef STR2INT_SRC_INC
+#define STR2INT_SRC_INC
+
+#include <common.h>
+
+#include <lib.h>
+
+/**
+** str2int(str,base) - convert a string to a number in the specified base
+**
+** @param str   The string to examine
+** @param base  The radix to use in the conversion
+**
+** @return The converted integer
+*/
+int str2int( register const char *str, register int base ) {
+	register int num = 0;
+	register char bchar = '9';
+	int sign = 1;
+
+	// check for leading '-'
+	if( *str == '-' ) {
+		sign = -1;
+		++str;
+	}
+
+	if( base != 10 ) {
+		bchar = '0' + base - 1;
+	}
+
+	// iterate through the characters
+	while( *str ) {
+		if( *str < '0' || *str > bchar )
+			break;
+		num = num * base + *str - '0';
+		++str;
+	}
+
+	// return the converted value
+	return( num * sign );
+}
+
+#endif