skeleton program parsing all optionsHEADmaster

1 files changed, 228 insertions, 0 deletions

diff --git a/ar.c b/ar.c
new file mode 100644
index 0000000..a3baf73
--- /dev/null
+++ b/ar.c
@@ -0,0 +1,228 @@
+#define _XOPEN_SOURCE 700
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+
+enum {
+	CLOBBER		= 1<<0,
+	CREATE_SILENTLY	= 1<<1,
+	SYMBOLS		= 1<<2,
+	TRUNCATE	= 1<<3,
+	UPDATE		= 1<<4,
+	VERBOSE		= 1<<5,
+
+	POSBEFORE	= 1<<6,
+	POSAFTER	= 1<<7,
+};
+
+static int ar_delete(int archive, const char *file, const char *posname, int flags)
+{
+	(void)posname;
+
+	if (flags & VERBOSE) {
+		printf("d - %s\n", file);
+	}
+
+	return 0;
+}
+
+static int ar_move(int archive, const char *file, const char *posname, int flags)
+{
+	if (flags & VERBOSE) {
+		printf("moving %s %s %s\n", file, flags & POSBEFORE ? "before" : "after", posname);
+	}
+
+	return 0;
+}
+
+static int ar_print(int archive, const char *file, const char *posname, int flags)
+{
+	(void)posname;
+
+	if (flags & VERBOSE) {
+		printf("\n<%s>\n\n", file);
+	}
+
+	return 0;
+}
+
+static int ar_quick(int archive, const char *file, const char *posname, int flags)
+{
+	(void)posname;
+
+	if (flags & VERBOSE) {
+		printf("quick adding %s\n", file);
+	}
+
+	return 0;
+}
+
+static int ar_replace(int archive, const char *file, const char *posname, int flags)
+{
+	if (flags & VERBOSE) {
+		printf("%c - %s\n", /* file exists ? 'r' : */ 'a', file);
+	}
+
+	return 0;
+}
+
+static int ar_toc(int archive, const char *file, const char *posname, int flags)
+{
+	(void)posname;
+	char *mode = "----------";
+	unsigned int uid = 0;
+	unsigned int gid = 0;
+	unsigned int size = 0;
+	char *month = "Jan";	/* %b */
+	int day = 0;		/* %e */
+	int hour = 0;		/* %H */
+	int minute = 0;		/* %M */
+	int year = 0;		/* %Y */
+
+	if (flags & VERBOSE) {
+		printf("%s %u/%u %u %s %d %d:%d %d %s\n", mode, uid, gid, size, month, day, hour, minute, year, file);
+	} else {
+		printf("%s\n", file);
+	}
+
+	return 0;
+}
+
+static int ar_extract(int archive, const char *file, const char *posname, int flags)
+{
+	(void)posname;
+
+	if (flags & VERBOSE) {
+		printf("x - %s\n", file);
+	}
+
+	return 0;
+}
+
+static int ar_usage(int archive, const char *file, const char *posname, int flags)
+{
+	(void)archive; (void)file; (void)posname; (void)flags;
+	printf("usage:\n");
+	printf("  ar -d [-v] archive file...\n");
+	printf("  ar -m [-v] archive file...\n");
+	printf("  ar -m (-a|-b|-i) [-v] posname archive file...\n");
+	printf("  ar -p [-vs] archive [file...]\n");
+	printf("  ar -q [-cv] archive file...\n");
+	printf("  ar -r [-cuv] archive file...\n");
+	printf("  ar -r (-a|-b|-i) [-cuv] posname archive file...\n");
+	printf("  ar -t [-vs] archive [file...]\n");
+	printf("  ar -x [-vsCT] archive [file...]\n");
+	return 1;
+}
+
+int main(int argc, char *argv[])
+{
+	int (*fn)(int, const char *, const char*, int);
+	char *posname = NULL;
+	char *archive = NULL;
+	int flags = CLOBBER;
+	int open_flags = 0;
+	int c;
+
+	while ((c = getopt(argc, argv, "abcCdimpqrstTuvx")) != -1) {
+		switch (c) {
+		case 'a':
+			flags |= POSAFTER;
+			flags &= ~POSBEFORE;
+			break;
+
+		case 'b':
+		case 'i':
+			flags |= POSBEFORE;
+			flags &= ~POSAFTER;
+			break;
+
+		case 'c':
+			flags |= CREATE_SILENTLY;
+			break;
+
+		case 'C':
+			flags &= ~CLOBBER;
+			break;
+
+		case 'd':
+			fn = ar_delete;
+			open_flags = O_RDWR;
+			break;
+
+		case 'm':
+			fn = ar_move;
+			open_flags = O_RDWR | O_CREAT;
+			break;
+
+		case 'p':
+			fn = ar_print;
+			open_flags = O_RDONLY;
+			break;
+
+		case 'q':
+			fn = ar_quick;
+			open_flags = O_RDWR | O_CREAT;
+			break;
+
+		case 'r':
+			fn = ar_replace;
+			open_flags = O_RDWR | O_CREAT;
+			break;
+
+		case 's':
+			flags |= SYMBOLS;
+			break;
+
+		case 't':
+			fn = ar_toc;
+			open_flags = O_RDONLY;
+			break;
+
+		case 'T':
+			flags |= TRUNCATE;
+			break;
+
+		case 'u':
+			flags |= UPDATE;
+			break;
+
+		case 'v':
+			flags |= VERBOSE;
+			break;
+
+		case 'x':
+			fn = ar_extract;
+			open_flags = O_RDONLY;
+			break;
+
+		default:
+			return 1;
+		}
+	}
+
+	if (flags & (POSBEFORE | POSAFTER)) {
+		posname = argv[optind++];
+	}
+
+	archive = argv[optind++];
+
+	int fd = open(archive, open_flags, 0644);
+	if (fd == -1) {
+		perror("ar");
+		return 1;
+	}
+
+	if (open_flags & O_CREAT) {
+		if (! (flags & CREATE_SILENTLY)) {
+			fprintf(stderr, "ar: creating %s\n", archive);
+		}
+	}
+
+	int ret = 0;
+	do {
+		ret |= fn(fd, argv[optind++], posname, flags);
+	} while (argv[optind]);
+
+	return 0;
+}