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any-reader: Add some comments on interface and implementation.
[pspp]
/
src
/
data
/
sys-file-reader.c
diff --git
a/src/data/sys-file-reader.c
b/src/data/sys-file-reader.c
index 8718a5f940ba9d96acca418c4b2fbbeb787a9048..b855b45566a179951cfde9315245bf90ee44dd4a 100644
(file)
--- a/
src/data/sys-file-reader.c
+++ b/
src/data/sys-file-reader.c
@@
-921,9
+921,8
@@
sys_file_casereader_destroy (struct casereader *reader UNUSED, void *r_)
sfm_close (&r->any_reader);
}
sfm_close (&r->any_reader);
}
-/* Returns 1 if FILE is an SPSS system file,
- 0 if it is not,
- otherwise a negative errno value. */
+/* Detects whether FILE is an SPSS system file. Returns 1 if so, 0 if not, and
+ a negative errno value if there is an error reading FILE. */
static int
sfm_detect (FILE *file)
{
static int
sfm_detect (FILE *file)
{
@@
-932,7
+931,7
@@
sfm_detect (FILE *file)
if (fseek (file, 0, SEEK_SET) != 0)
return -errno;
if (fread (magic, 4, 1, file) != 1)
if (fseek (file, 0, SEEK_SET) != 0)
return -errno;
if (fread (magic, 4, 1, file) != 1)
- return fe
of (file) ? 0 : -errno
;
+ return fe
rror (file) ? -errno : 0
;
magic[4] = '\0';
return (!strcmp (ASCII_MAGIC, magic)
magic[4] = '\0';
return (!strcmp (ASCII_MAGIC, magic)