APG v2.1.0

getopt.c

@@ -0,0 +1,94 @@
+/*
+ * Modified by Adel I. Mirzazhanov 2002
+ * getopt - get option letter from argv
+ *
+ * This is a version of the public domain getopt() implementation by
+ * Henry Spencer, changed for 4.3BSD compatibility (in addition to System V).
+ * It allows rescanning of an option list by setting optind to 0 before
+ * calling, which is why we use it even if the system has its own (in fact,
+ * this one has a unique name so as not to conflict with the system's).
+ * Thanks to Dennis Ferguson for the appropriate modifications.
+ *
+ * This file is in the Public Domain.
+ */
+
+#include <stdio.h>
+#include "getopt.h"
+
+static int badopt(const char *mess,int ch);
+
+
+char	*apg_optarg;	/* Global argument pointer. */
+int	apg_optind = 0;	/* Global argv index. */
+int	apg_opterr = 1;	/* for compatibility, should error be printed? */
+int	apg_optopt;	/* for compatibility, option character checked */
+
+static char	*scan = NULL;	/* Private scan pointer. */
+static const char	*prog = "apg";
+
+/*
+ * Print message about a bad option.
+ */
+static int
+badopt(const char *mess,int ch)
+{
+	if (apg_opterr) {
+		fprintf(stderr,"%s%s%c\n", prog, mess, ch);
+		fflush(stderr);
+	}
+	return ('?');
+}
+
+int
+apg_getopt(int argc,char *argv[],const char *optstring)
+{
+	register char c;
+	register const char *place;
+
+	prog = argv[0];
+	apg_optarg = NULL;
+
+	if (apg_optind == 0) {
+		scan = NULL;
+		apg_optind++;
+	}
+	
+	if (scan == NULL || *scan == '\0') {
+		if (apg_optind >= argc
+		    || argv[apg_optind][0] != '-'
+		    || argv[apg_optind][1] == '\0') {
+			return (EOF);
+		}
+		if (argv[apg_optind][1] == '-'
+		    && argv[apg_optind][2] == '\0') {
+			apg_optind++;
+			return (EOF);
+		}
+	
+		scan = argv[apg_optind++]+1;
+	}
+
+	c = *scan++;
+	apg_optopt = c & 0377;
+	for (place = optstring; place != NULL && *place != '\0'; ++place)
+	    if (*place == c)
+		break;
+
+	if (place == NULL || *place == '\0' || c == ':' || c == '?') {
+		return (badopt(": unknown option -", c));
+	}
+
+	place++;
+	if (*place == ':') {
+		if (*scan != '\0') {
+			apg_optarg = scan;
+			scan = NULL;
+		} else if (apg_optind >= argc) {
+			return (badopt(": option requires an argument -", c));
+		} else {
+			apg_optarg = argv[apg_optind++];
+		}
+	}
+
+	return (c & 0377);
+}