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vcs-svn: teach line_buffer to handle multiple input files

Collect the line_buffer state in a newly public line_buffer struct.
Callers can use multiple line_buffers to manage input from multiple
files at a time.

svn-fe's delta applier will use this to stream a delta from svnrdump
and the preimage it applies to from fast-import at the same time.

The tests don't take advantage of the new features, but I think that's
okay.  It is easier to find lingering examples of nonreentrant code by
searching for "static" in line_buffer.c.

Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
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1 parent d350822 commit e5e45ca1e35482d120a7ce776cf208369edcc459 @jrn jrn committed Oct 11, 2010
Showing with 50 additions and 46 deletions.
  1. +9 −8 test-line-buffer.c
  2. +3 −3 vcs-svn/fast_export.c
  3. +4 −1 vcs-svn/fast_export.h
  4. +8 −12 vcs-svn/line_buffer.c
  5. +7 −7 vcs-svn/line_buffer.h
  6. +3 −2 vcs-svn/line_buffer.txt
  7. +16 −13 vcs-svn/svndump.c
View
@@ -22,25 +22,26 @@ static uint32_t strtouint32(const char *s)
int main(int argc, char *argv[])
{
+ struct line_buffer buf = LINE_BUFFER_INIT;
char *s;
if (argc != 1)
usage("test-line-buffer < input.txt");
- if (buffer_init(NULL))
+ if (buffer_init(&buf, NULL))
die_errno("open error");
- while ((s = buffer_read_line())) {
- s = buffer_read_string(strtouint32(s));
+ while ((s = buffer_read_line(&buf))) {
+ s = buffer_read_string(&buf, strtouint32(s));
fputs(s, stdout);
fputc('\n', stdout);
- buffer_skip_bytes(1);
- if (!(s = buffer_read_line()))
+ buffer_skip_bytes(&buf, 1);
+ if (!(s = buffer_read_line(&buf)))
break;
- buffer_copy_bytes(strtouint32(s) + 1);
+ buffer_copy_bytes(&buf, strtouint32(s) + 1);
}
- if (buffer_deinit())
+ if (buffer_deinit(&buf))
die("input error");
if (ferror(stdout))
die("output error");
- buffer_reset();
+ buffer_reset(&buf);
return 0;
}
@@ -63,14 +63,14 @@ void fast_export_commit(uint32_t revision, uint32_t author, char *log,
printf("progress Imported commit %"PRIu32".\n\n", revision);
}
-void fast_export_blob(uint32_t mode, uint32_t mark, uint32_t len)
+void fast_export_blob(uint32_t mode, uint32_t mark, uint32_t len, struct line_buffer *input)
{
if (mode == REPO_MODE_LNK) {
/* svn symlink blobs start with "link " */
- buffer_skip_bytes(5);
+ buffer_skip_bytes(input, 5);
len -= 5;
}
printf("blob\nmark :%"PRIu32"\ndata %"PRIu32"\n", mark, len);
- buffer_copy_bytes(len);
+ buffer_copy_bytes(input, len);
fputc('\n', stdout);
}
@@ -1,11 +1,14 @@
#ifndef FAST_EXPORT_H_
#define FAST_EXPORT_H_
+#include "line_buffer.h"
+
void fast_export_delete(uint32_t depth, uint32_t *path);
void fast_export_modify(uint32_t depth, uint32_t *path, uint32_t mode,
uint32_t mark);
void fast_export_commit(uint32_t revision, uint32_t author, char *log,
uint32_t uuid, uint32_t url, unsigned long timestamp);
-void fast_export_blob(uint32_t mode, uint32_t mark, uint32_t len);
+void fast_export_blob(uint32_t mode, uint32_t mark, uint32_t len,
+ struct line_buffer *input);
#endif
View
@@ -8,20 +8,16 @@
#include "strbuf.h"
#define COPY_BUFFER_LEN 4096
-static struct line_buffer buf_ = LINE_BUFFER_INIT;
-static struct line_buffer *buf;
-int buffer_init(const char *filename)
+int buffer_init(struct line_buffer *buf, const char *filename)
{
- buf = &buf_;
-
buf->infile = filename ? fopen(filename, "r") : stdin;
if (!buf->infile)
return -1;
return 0;
}
-int buffer_deinit(void)
+int buffer_deinit(struct line_buffer *buf)
{
int err;
if (buf->infile == stdin)
@@ -32,7 +28,7 @@ int buffer_deinit(void)
}
/* Read a line without trailing newline. */
-char *buffer_read_line(void)
+char *buffer_read_line(struct line_buffer *buf)
{
char *end;
if (!fgets(buf->line_buffer, sizeof(buf->line_buffer), buf->infile))
@@ -53,14 +49,14 @@ char *buffer_read_line(void)
return buf->line_buffer;
}
-char *buffer_read_string(uint32_t len)
+char *buffer_read_string(struct line_buffer *buf, uint32_t len)
{
strbuf_reset(&buf->blob_buffer);
strbuf_fread(&buf->blob_buffer, len, buf->infile);
return ferror(buf->infile) ? NULL : buf->blob_buffer.buf;
}
-void buffer_copy_bytes(uint32_t len)
+void buffer_copy_bytes(struct line_buffer *buf, uint32_t len)
{
char byte_buffer[COPY_BUFFER_LEN];
uint32_t in;
@@ -70,13 +66,13 @@ void buffer_copy_bytes(uint32_t len)
len -= in;
fwrite(byte_buffer, 1, in, stdout);
if (ferror(stdout)) {
- buffer_skip_bytes(len);
+ buffer_skip_bytes(buf, len);
return;
}
}
}
-void buffer_skip_bytes(uint32_t len)
+void buffer_skip_bytes(struct line_buffer *buf, uint32_t len)
{
char byte_buffer[COPY_BUFFER_LEN];
uint32_t in;
@@ -87,7 +83,7 @@ void buffer_skip_bytes(uint32_t len)
}
}
-void buffer_reset(void)
+void buffer_reset(struct line_buffer *buf)
{
strbuf_release(&buf->blob_buffer);
}
View
@@ -12,12 +12,12 @@ struct line_buffer {
};
#define LINE_BUFFER_INIT {"", STRBUF_INIT, NULL}
-int buffer_init(const char *filename);
-int buffer_deinit(void);
-char *buffer_read_line(void);
-char *buffer_read_string(uint32_t len);
-void buffer_copy_bytes(uint32_t len);
-void buffer_skip_bytes(uint32_t len);
-void buffer_reset(void);
+int buffer_init(struct line_buffer *buf, const char *filename);
+int buffer_deinit(struct line_buffer *buf);
+char *buffer_read_line(struct line_buffer *buf);
+char *buffer_read_string(struct line_buffer *buf, uint32_t len);
+void buffer_copy_bytes(struct line_buffer *buf, uint32_t len);
+void buffer_skip_bytes(struct line_buffer *buf, uint32_t len);
+void buffer_reset(struct line_buffer *buf);
#endif
@@ -14,14 +14,15 @@ Calling sequence
The calling program:
+ - initializes a `struct line_buffer` to LINE_BUFFER_INIT
- specifies a file to read with `buffer_init`
- processes input with `buffer_read_line`, `buffer_read_string`,
`buffer_skip_bytes`, and `buffer_copy_bytes`
- closes the file with `buffer_deinit`, perhaps to start over and
read another file.
-Before exiting, the caller can use `buffer_reset` to deallocate
-resources for the benefit of profiling tools.
+When finished, the caller can use `buffer_reset` to deallocate
+resources.
Functions
---------
View
@@ -30,6 +30,8 @@
/* Create memory pool for log messages */
obj_pool_gen(log, char, 4096)
+static struct line_buffer input = LINE_BUFFER_INIT;
+
static char* log_copy(uint32_t length, char *log)
{
char *buffer;
@@ -115,14 +117,14 @@ static void read_props(void)
uint32_t key = ~0;
char *val = NULL;
char *t;
- while ((t = buffer_read_line()) && strcmp(t, "PROPS-END")) {
+ while ((t = buffer_read_line(&input)) && strcmp(t, "PROPS-END")) {
if (!strncmp(t, "K ", 2)) {
len = atoi(&t[2]);
- key = pool_intern(buffer_read_string(len));
- buffer_read_line();
+ key = pool_intern(buffer_read_string(&input, len));
+ buffer_read_line(&input);
} else if (!strncmp(t, "V ", 2)) {
len = atoi(&t[2]);
- val = buffer_read_string(len);
+ val = buffer_read_string(&input, len);
if (key == keys.svn_log) {
/* Value length excludes terminating nul. */
rev_ctx.log = log_copy(len + 1, val);
@@ -137,7 +139,7 @@ static void read_props(void)
node_ctx.type = REPO_MODE_LNK;
}
key = ~0;
- buffer_read_line();
+ buffer_read_line(&input);
}
}
}
@@ -179,9 +181,10 @@ static void handle_node(void)
node_ctx.type = node_ctx.srcMode;
if (node_ctx.mark)
- fast_export_blob(node_ctx.type, node_ctx.mark, node_ctx.textLength);
+ fast_export_blob(node_ctx.type,
+ node_ctx.mark, node_ctx.textLength, &input);
else if (node_ctx.textLength != LENGTH_UNKNOWN)
- buffer_skip_bytes(node_ctx.textLength);
+ buffer_skip_bytes(&input, node_ctx.textLength);
}
static void handle_revision(void)
@@ -200,7 +203,7 @@ void svndump_read(const char *url)
uint32_t key;
reset_dump_ctx(pool_intern(url));
- while ((t = buffer_read_line())) {
+ while ((t = buffer_read_line(&input))) {
val = strstr(t, ": ");
if (!val)
continue;
@@ -257,15 +260,15 @@ void svndump_read(const char *url)
node_ctx.propLength = atoi(val);
} else if (key == keys.content_length) {
len = atoi(val);
- buffer_read_line();
+ buffer_read_line(&input);
if (active_ctx == REV_CTX) {
read_props();
} else if (active_ctx == NODE_CTX) {
handle_node();
active_ctx = REV_CTX;
} else {
fprintf(stderr, "Unexpected content length header: %"PRIu32"\n", len);
- buffer_skip_bytes(len);
+ buffer_skip_bytes(&input, len);
}
}
}
@@ -277,7 +280,7 @@ void svndump_read(const char *url)
void svndump_init(const char *filename)
{
- buffer_init(filename);
+ buffer_init(&input, filename);
repo_init();
reset_dump_ctx(~0);
reset_rev_ctx(0);
@@ -292,7 +295,7 @@ void svndump_deinit(void)
reset_dump_ctx(~0);
reset_rev_ctx(0);
reset_node_ctx(NULL);
- if (buffer_deinit())
+ if (buffer_deinit(&input))
fprintf(stderr, "Input error\n");
if (ferror(stdout))
fprintf(stderr, "Output error\n");
@@ -301,7 +304,7 @@ void svndump_deinit(void)
void svndump_reset(void)
{
log_reset();
- buffer_reset();
+ buffer_reset(&input);
repo_reset();
reset_dump_ctx(~0);
reset_rev_ctx(0);

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