Start of "patch" support. Writes to stdout at the moment.

2 files changed, 58 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 389adcdc..547fe400 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -192,6 +192,11 @@ int xopen(char *path, int flags)
 	return xcreate(path, flags, 0);
 }
 
+void xclose(int fd)
+{
+	if (close(fd)) perror_exit("xclose");
+}
+
 // Die unless we can open/create a file, returning FILE *.
 FILE *xfopen(char *path, char *mode)
 {
@@ -567,3 +572,46 @@ void loopfiles(char **argv, void (*function)(int fd, char *name))
 		close(fd);
 	} while (*++argv);
 }
+
+// Slow, but small.
+
+char *get_rawline(int fd, long *plen)
+{
+	char c, *buf = NULL;
+	long len = 0;
+
+	for (;;) {
+		if (1>read(fd, &c, 1)) break;
+		if (!(len & 63)) buf=xrealloc(buf, len+64);
+		if ((buf[len++]=c) == '\n') break;
+	}
+	if (buf) buf[len]=0;
+	if (plen) *plen = len;
+
+	return buf;
+}
+
+char *get_line(int fd)
+{
+	long len;
+	char *buf = get_rawline(fd, &len);
+
+	if (buf && buf[--len]=='\n') buf[len]=0;
+
+	return buf;
+}
+
+// Copy the rest of in to out and close both files.
+
+void xsendfile(int in, int out)
+{
+	long len;
+
+	if (in<0) return;
+	for (;;) {
+		len = xread(in, toybuf, sizeof(toybuf));
+		if (len<1) break;
+		xwrite(out, toybuf, len);
+	}
+	xclose(in);
+}
diff --git a/lib/lib.h b/lib/lib.h
index 963abb68..063c5d02 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -21,6 +21,12 @@ struct arg_list {
 	char *arg;
 };
 
+struct double_list {
+	struct double_list *next;
+	struct double_list *prev;
+	char *data;
+};
+
 // args.c
 void get_optflags(void);
 
@@ -56,6 +62,7 @@ void xexec(char **argv);
 void xaccess(char *path, int flags);
 int xcreate(char *path, int flags, int mode);
 int xopen(char *path, int flags);
+void xclose(int fd);
 FILE *xfopen(char *path, char *mode);
 ssize_t readall(int fd, void *buf, size_t len);
 ssize_t writeall(int fd, void *buf, size_t len);
@@ -74,6 +81,9 @@ long atolx(char *c);
 off_t fdlength(int fd);
 char *xreadlink(char *name);
 void loopfiles(char **argv, void (*function)(int fd, char *name));
+char *get_rawline(int fd, long *plen);
+char *get_line(int fd);
+void xsendfile(int in, int out);
 
 // getmountlist.c
 struct mtab_list {