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Go Back   Linux Archive > ArchLinux > ArchLinux Pacman Development

 
 
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Old 06-24-2011, 05:18 AM
Dan McGee
 
Default archive_fgets(): ensure we return any trailing text with no newline

Discovered this when doing some pactest rewrite work to generate
archives in memory only. If a sync database file or PKGINFO file is
missing a newline on the final line, the text from that line gets tossed
aside and never read into the package struct. This is pretty critical
when that last line is a depend or something.

Signed-off-by: Dan McGee <dan@archlinux.org>
---
lib/libalpm/util.c | 18 ++++++++++++------
1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/lib/libalpm/util.c b/lib/libalpm/util.c
index e56c9f2..7bd4542 100644
--- a/lib/libalpm/util.c
+++ b/lib/libalpm/util.c
@@ -760,9 +760,8 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
&b->block_size, &offset);
b->block_offset = b->block;

- /* error or end of archive with no data read, cleanup */
- if(b->ret < ARCHIVE_OK ||
- (b->block_size == 0 && b->ret == ARCHIVE_EOF)) {
+ /* error, cleanup */
+ if(b->ret < ARCHIVE_OK) {
goto cleanup;
}
}
@@ -779,19 +778,20 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
/* allocate our buffer, or ensure our existing one is big enough */
if(!b->line) {
/* set the initial buffer to the read block_size */
- CALLOC(b->line, b->block_size + 1, sizeof(char), return ENOMEM);
+ CALLOC(b->line, b->block_size + 1, sizeof(char), b->ret = -ENOMEM; goto cleanup);
b->line_size = b->block_size + 1;
b->line_offset = b->line;
} else {
size_t needed = (size_t)((b->line_offset - b->line)
+ (i - b->block_offset) + 1);
if(needed > b->max_line_size) {
- return ERANGE;
+ b->ret = -ERANGE;
+ goto cleanup;
}
if(needed > b->line_size) {
/* need to realloc + copy data to fit total length */
char *new;
- CALLOC(new, needed, sizeof(char), return ENOMEM);
+ CALLOC(new, needed, sizeof(char), b->ret = -ENOMEM; goto cleanup);
memcpy(new, b->line, b->line_size);
b->line_size = needed;
b->line_offset = new + (b->line_offset - b->line);
@@ -813,6 +813,12 @@ int _alpm_archive_fgets(struct archive *a, struct archive_read_buffer *b)
memcpy(b->line_offset, b->block_offset, len);
b->line_offset += len;
b->block_offset = i;
+ /* there was no new data, return what is left; saved ARCHIVE_EOF will be
+ * returned on next call */
+ if(len == 0) {
+ b->line_offset[0] = '';
+ return ARCHIVE_OK;
+ }
}
}

--
1.7.5.4
 

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