contrib/archivetest: add help, support stdin, quiet mode and data skip mode

contrib/archivetest.c

@@ -24,7 +24,7 @@
  */
 
 /*
- * This utility tests parsing files by libarchive
+ * Archivetest verifies reading archives with libarchive
  *
  * It may be used to reproduce failures in testcases discovered by OSS-Fuzz
  * https://github.com/google/oss-fuzz/blob/master/projects/libarchive
@@ -32,6 +32,8 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <stdarg.h>
+#include <ctype.h>
 #include <archive.h>
 #include <archive_entry.h>
 
@@ -64,6 +66,38 @@ const char *errnostr(int errno)
 	return (estr);
 }
 
+void usage(const char *prog)
+{
+	fprintf(stderr, "Usage: %s [-f filename] [-h] [-q] [-s]\n", prog);
+}
+
+void printhelp()
+{
+	fprintf(stdout, "archivetest: verify reading archives with "
+	    "libarchive\n\n"
+	    "Options:\n"
+	    "  -f filename	Filename to verify\n"
+	    "  -h		Show this help\n"
+	    "  -q		Quiet mode\n"
+	    "  -s		Verify only headers (skip data)\n\n"
+	    "If no filename is specified, data is read from standard input.\n"
+	    "\n%s\n", archive_version_details());
+}
+
+int v_print(int verbose, const char *format, ...)
+{
+	int r = 0;
+
+	if (verbose) {
+		va_list args;
+
+		va_start(args, format);
+		r = vfprintf(stdout, format, args);
+		va_end(args);
+	}
+	return (r);
+}
+
 int main(int argc, char *argv[])
 {
 	struct archive *a;
@@ -72,39 +106,77 @@ int main(int argc, char *argv[])
 	const char *p;
 	char buffer[4096];
 	int c;
+	int v, skip_data;
 	int r = ARCHIVE_OK;
 	int format_printed;
 
-	if (argc != 2) {
-		fprintf(stderr, "Usage: %s filename\n", argv[0]);
-		exit(1);
-	}
+	filename = NULL;
+	skip_data = 0;
+	v = 1;
 
-	filename = argv[1];
+	while ((c = getopt (argc, argv, "f:hqs")) != -1) {
+		switch (c) {
+			case 'f':
+				filename = optarg;
+				break;
+			case 'h':
+				printhelp();
+				exit(0);
+			case 'q':
+				v = 0;
+				break;
+			case 's':
+				skip_data = 1;
+				break;
+			case '?':
+				if (optopt == 'f')
+					fprintf(stderr, "Option -%c requires "
+					    "an argument.\n", optopt);
+				else if (isprint(optopt))
+					fprintf(stderr, "Unknown option '-%c'"
+					    ".\n", optopt);
+				else
+					fprintf(stderr, "Unknown option "
+					    "character '\\x%x'.\n", optopt);
+				usage(argv[0]);
+			default:
+				exit(1);
+		}
+	}
 
 	a = archive_read_new();
 
 	archive_read_support_filter_all(a);
 	archive_read_support_format_all(a);
 
-	r = archive_read_open_filename(a, filename, 4096);
+	v_print(v, "Data source: ");
+
+	if (filename == NULL) {
+		v_print(v, "standard input\n");
+		r = archive_read_open_fd(a, STDIN_FILENO, 4096);
+	} else {
+		v_print(v, "filename: %s\n", filename);
+		r = archive_read_open_filename(a, filename, 4096);
+	}
+
 	if (r != ARCHIVE_OK) {
 		archive_read_free(a);
-		fprintf(stderr, "Error opening filename: %s\n", filename);
-		exit(ARCHIVE_FATAL);
+		fprintf(stderr, "Invalid or unsupported data source\n");
+		exit(1);
 	}
 
 	format_printed = 0;
 	c = 1;
+
 	while (1) {
 		r = archive_read_next_header(a, &entry);
 		if (r == ARCHIVE_FATAL) {
-			fprintf(stdout,
-			    "Entry %d: fatal error reding header\n", c);
+			v_print(v, "Entry %d: fatal error reading "
+			    "header\n", c);
 			break;
 		}
 		if (!format_printed) {
-			fprintf(stdout, "Filter: %s\nFormat: %s\n",
+			v_print(v, "Filter: %s\nFormat: %s\n",
 			    archive_filter_name(a, 0), archive_format_name(a));
 			format_printed = 1;
 		}
@@ -113,25 +185,30 @@ int main(int argc, char *argv[])
 		if (r == ARCHIVE_EOF)
 			break;
 		p = archive_entry_pathname(entry);
+		v_print(v, "Entry %d: %s, pathname", c, errnostr(r));
 		if (p == NULL || p[0] == '\0')
-			fprintf(stdout, "Entry %d: %s, ureadable pathname\n",
-			    c, errnostr(r));
+			v_print(v, " unreadable");
 		else
-			fprintf(stdout, "Entry %d: %s, pathname: %s\n", c,
-			    errnostr(r), p);
-		while ((r = archive_read_data(a, buffer, 4096) > 0))
-		;
-		if (r == ARCHIVE_FATAL) {
-			fprintf(stderr, "Entry %d: fatal error reading data\n",
-			    c);
-			break;
+			v_print(v, ": %s", p);
+		v_print(v, ", data: ");
+		if (skip_data) {
+			v_print(v, "skipping");
+		} else {
+			while ((r = archive_read_data(a, buffer, 4096) > 0))
+			;
+			if (r == ARCHIVE_FATAL) {
+				v_print(v, "ERROR\n");
+				break;
+			}
+			v_print(v, "OK");
 		}
+		v_print(v, "\n");
 		c++;
 	}
 	archive_read_free(a);
 
-	fprintf(stdout, "Last return code: %s (%d)\n", errnostr(r), r);
+	v_print(v, "Last return code: %s (%d)\n", errnostr(r), r);
 	if (r == ARCHIVE_EOF || r == ARCHIVE_OK)
 		exit(0);
-	exit(1);
+	exit(2);
 }