initial release of ivypointer

1 files changed, 76 insertions, 0 deletions

diff --git a/src/getopt.c b/src/getopt.c
new file mode 100644
index 0000000..36a9bc1
--- /dev/null
+++ b/src/getopt.c
@@ -0,0 +1,76 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int             optind = 1;
+char            *optarg = (char *)NULL;
+
+int	getopt (int argc, char **argv, char *optstring)
+{
+    int		cur_option;		/* Current option		*/
+    char	*cp;			/* Character pointer		*/
+    static int	GetOptionPosition = 1;
+
+    if (GetOptionPosition == 1)
+    {
+
+/* Check for out of range, correct start character and not single */
+
+	if ((optind >= argc) || (*argv[optind] != '-') || !argv[optind][1])
+	    return EOF;
+
+	if (!strcmp (argv[optind], "--"))
+	    return EOF;
+    }
+
+/* Get the current character from the current argument vector */
+
+    cur_option = argv[optind][GetOptionPosition];
+
+/* Validate it */
+
+    if ((cur_option == ':') ||
+	((cp = strchr (optstring, cur_option)) == (char *)NULL))
+    {
+
+/* Move to the next offset */
+
+	if (!argv[optind][++GetOptionPosition])
+	{
+	    optind++;
+	    GetOptionPosition = 1;
+	}
+
+	return '?';
+    }
+
+/* Parameters following ? */
+
+    optarg = (char *)NULL;
+
+    if (*(++cp) == ':')
+    {
+	if (argv[optind][GetOptionPosition + 1])
+	    optarg = &argv[optind++][GetOptionPosition + 1];
+
+	else if (++optind >= argc)
+	{
+	    optarg = (char *)NULL;
+	    GetOptionPosition = 1;
+	    return '?';
+	}
+
+	else
+	    optarg = argv[optind++];
+
+	GetOptionPosition = 1;
+    }
+
+    else if (!argv[optind][++GetOptionPosition])
+    {
+	GetOptionPosition = 1;
+	optind++;
+    }
+
+    return cur_option;
+}