diff: add missing file

1 files changed, 103 insertions, 0 deletions

diff --git a/sys/src/cmd/diff/util.c b/sys/src/cmd/diff/util.c
new file mode 100644
index 000000000..437473d27
--- /dev/null
+++ b/sys/src/cmd/diff/util.c
@@ -0,0 +1,103 @@
+#include <u.h>
+#include <libc.h>
+#include <bio.h>
+#include "diff.h"
+
+Biobuf	stdout;
+char	mode;			/* '\0', 'e', 'f', 'h' */
+char	bflag;			/* ignore multiple and trailing blanks */
+char	rflag;			/* recurse down directory trees */
+char	mflag;			/* pseudo flag: doing multiple files, one dir */
+int	anychange;
+
+static char *tmp[] = {"/tmp/diff1XXXXXXXXXXX", "/tmp/diff2XXXXXXXXXXX"};
+static int whichtmp;
+
+void *
+emalloc(unsigned n)
+{
+	register void *p;
+
+	if ((p = malloc(n)) == 0)
+		sysfatal("malloc: %r");
+	return p;
+}
+
+void *
+erealloc(void *p, unsigned n)
+{
+	void *rp;
+
+	if ((rp = realloc(p, n)) == 0)
+		sysfatal("realloc: %r");
+	return rp;
+}
+
+int
+mkpathname(char *pathname, char *path, char *name)
+{
+	if (strlen(path) + strlen(name) > MAXPATHLEN) {
+		sysfatal("pathname %s/%s too long", path, name);
+		return 1;
+	}
+	sprint(pathname, "%s/%s", path, name);
+	return 0;
+}
+
+char *
+mktmpfile(int input, Dir **sb)
+{
+	int fd, i;
+	char *p;
+	char buf[8192];
+
+	p = mktemp(tmp[whichtmp++]);
+	/*
+	 * Because we want this file to stick around
+	 * for the entire run of the program, we leak
+	 * the fd intentionally here; when we exit,
+	 * the system will remove the file for us.
+	 */
+	fd = create(p, OWRITE|ORCLOSE, 0600);
+	if (fd < 0) {
+		sysfatal("cannot create %s: %r", p);
+		return 0;
+	}
+	while ((i = read(input, buf, sizeof(buf))) > 0) {
+		if ((i = write(fd, buf, i)) < 0)
+			break;
+	}
+	*sb = dirfstat(fd);
+	if (i < 0) {
+		sysfatal("cannot read/write %s: %r", p);
+		return 0;
+	}
+	return p;
+}
+
+char *
+statfile(char *file, Dir **sb)
+{
+	Dir *dir;
+	int input;
+
+	dir = dirstat(file);
+	if(dir == nil) {
+		if (strcmp(file, "-") || (dir = dirfstat(0)) == nil) {
+			sysfatal("cannot stat %s: %r", file);
+			return 0;
+		}
+		free(dir);
+		return mktmpfile(0, sb);
+	} else if (!REGULAR_FILE(dir) && !DIRECTORY(dir)) {
+		free(dir);
+		if ((input = open(file, OREAD)) == -1) {
+			sysfatal("cannot open %s: %r", file);
+			return 0;
+		}
+		file = mktmpfile(input, sb);
+		close(input);
+	} else
+		*sb = dir;
+	return file;
+}