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authorJonathan Nieder <jrnieder@gmail.com>2011-01-03 03:10:59 (GMT)
committerJonathan Nieder <jrnieder@gmail.com>2011-02-26 10:59:37 (GMT)
commitb1c9b798a6dd391aeaea31663a65164815701244 (patch)
treeadc32fa7f1f4cfaaac28c0f3017c6b247a583136 /vcs-svn/line_buffer.c
parentcb3f87cf1ba90373fdc240d65a4d65434099d9a3 (diff)
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vcs-svn: teach line_buffer about temporary files
It can sometimes be useful to write information temporarily to file, to read back later. These functions allow a program to use the line_buffer facilities when doing so. It works like this: 1. find a unique filename with buffer_tmpfile_init. 2. rewind with buffer_tmpfile_rewind. This returns a stdio handle for writing. 3. when finished writing, declare so with buffer_tmpfile_prepare_to_read. The return value indicates how many bytes were written. 4. read whatever portion of the file is needed. 5. if finished, remove the temporary file with buffer_deinit. otherwise, go back to step 2, The svn support would use this to buffer the postimage from delta application until the length is known and fast-import can receive the resulting blob. Based-on-patch-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
Diffstat (limited to 'vcs-svn/line_buffer.c')
-rw-r--r--vcs-svn/line_buffer.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/vcs-svn/line_buffer.c b/vcs-svn/line_buffer.c
index e29a81a..aedf105 100644
--- a/vcs-svn/line_buffer.c
+++ b/vcs-svn/line_buffer.c
@@ -25,6 +25,14 @@ int buffer_fdinit(struct line_buffer *buf, int fd)
return 0;
}
+int buffer_tmpfile_init(struct line_buffer *buf)
+{
+ buf->infile = tmpfile();
+ if (!buf->infile)
+ return -1;
+ return 0;
+}
+
int buffer_deinit(struct line_buffer *buf)
{
int err;
@@ -35,6 +43,22 @@ int buffer_deinit(struct line_buffer *buf)
return err;
}
+FILE *buffer_tmpfile_rewind(struct line_buffer *buf)
+{
+ rewind(buf->infile);
+ return buf->infile;
+}
+
+long buffer_tmpfile_prepare_to_read(struct line_buffer *buf)
+{
+ long pos = ftell(buf->infile);
+ if (pos < 0)
+ return error("ftell error: %s", strerror(errno));
+ if (fseek(buf->infile, 0, SEEK_SET))
+ return error("seek error: %s", strerror(errno));
+ return pos;
+}
+
int buffer_read_char(struct line_buffer *buf)
{
return fgetc(buf->infile);