Refactor some code and add container.c

1 files changed, 95 insertions, 0 deletions

diff --git a/container.c b/container.c
new file mode 100644
index 0000000..ba42234
--- /dev/null
+++ b/container.c
@@ -0,0 +1,95 @@
+/* Copyright 2017 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <config.h>
+
+#include "container.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <string.h>
+#include <regex.h>
+#include <sysexits.h>
+
+extern char *progname;
+
+extern bool verbose;
+extern int wrap;
+
+#define die(status, msg, ...) \
+        { fprintf(stderr, "error: %s.%s() line %d: " msg "\n", progname, \
+        		__func__, __LINE__, __VA_ARGS__); exit(status); }
+
+#define debug_msg(msg, ...) \
+        if (debug) fprintf(stderr, "--> %s.%s(): " msg "\n", progname, \
+        		__func__, __VA_ARGS__);
+
+#define verbose_msg(msg, ...) \
+        if (verbose) fprintf(stdout, "--> %s: " msg "\n", progname, \
+        		__VA_ARGS__);
+
+void verbose_print(char *lead, unsigned char *buffer, size_t buflen)
+{
+	if (!verbose)
+		return;
+	unsigned int i, indent = 4;
+	char prelead[100];
+	snprintf(prelead, 100, "--> %s: ", progname);
+
+	char *pad = (((strlen(prelead) + strlen(lead)) % 2) == 0) ? "" : " ";
+	wrap = ((wrap % 2) == 0) ? wrap : wrap - 1;
+	indent = ((indent % 2) == 0) ? indent : indent - 1;
+	int col = fprintf(stdout, "%s%s%s", prelead, lead, pad);
+	for (i = 1; i < buflen + 1; i++) {
+		fprintf(stdout, "%02x", buffer[i - 1]);
+		col = col + 2;
+		if (((col % wrap) == 0) && (i < buflen)) {
+			fprintf(stdout, "\n%*c", indent, ' ');
+			col = indent;
+		}
+	}
+	fprintf(stdout, "\n");
+}
+
+int isValidHex(char *input, int len) {
+	int r;
+	size_t maxlen = 512; // sane limit
+	regex_t regexpr;
+	char pattern[48];
+	char multiplier[8];
+	bool result = false;
+
+	if (strnlen(input, maxlen) >= maxlen)
+		die(EX_DATAERR, "input exceeded max length: %lu", maxlen);
+
+	if (len > 0)
+		sprintf(multiplier, "{%d}", len * 2);
+	else
+		sprintf(multiplier, "+");
+
+	sprintf(pattern, "^(0x|0X)?[a-fA-F0-9]%s$", multiplier);
+
+	if ((r = regcomp(&regexpr, pattern, REG_EXTENDED | REG_NOSUB)))
+		die(EX_SOFTWARE, "%s", "failure to compile regex");
+
+	if (!(r = regexec(&regexpr, input, 0, NULL, 0)))
+		result = true;
+
+	regfree(&regexpr);
+	return result;
+}