Second of a series of cleanups to libfetch.

This commit introduces the following features:

 a) the fetchStat*() functions, which return meta-information for a
    document, such as size, modification time, etc.

 b) the use of the com_err(3) facilities to report errors.

It also fixes a bunch of style bugs and a few logic bugs and somewhat
improves the man page.

Changed files, in alphabetical order:

 Makefile:
  Don't generate macros in {ftp,http}err.c.

  Generate category fields for the error message lists.

  Compile the error table.

  Install fetch_err.h along with fetch.h.

 common.c:
  Remove the _netdb_errstring() macro, and add FETCH_ERR_NETDB to the
  error code in the _netdb_seterr() macro.

  Add categories to the _netdb_errlist table.

  Report errors through the Common Error library.

 common.h:
  Add the DEBUG macros.

  Add prototype for fetchConnect().

  Remove the prototype for _fetch_errstring(), which is local to common.c

  Add a categroy field to struct fetcherr, and define constants for
  error categories.

  Define macros for _{url,netdb,ftp,http}_seterr().

 errors.et: (new file)
  List error categories.

 fetch.3:
  Document the fetchStat*() functions.

  Move the "unimplemented functionality" comments from NOTES to BUGS.

  Document that applications which use libfetch must also use
  libcom_err, and list existing error codes.

  Undocument fetchLastErr{Code,String}.

  Remove the (empty) DIAGNOSTICS section.

  Mention Eugene Skepner in the AUTHORS section.

 fetch.c:
  Move the DEBUG macros to common.c

  Add fetchStat() and fetchStatURL().

  Generate error messages for URL parser errors, and fix a minor bug
  in the parser.

  Use 'struct url' instead of 'url_t'.

  Remove fetchLastErr{Code,String}.

 fetch.h:
  Use 'struct url' instead of 'url_t', and remove the typedef.

  Define struct url_stat (used by fetchStat()).

  Add prototypes for fetchStat*().

  Remove the declarations for fetchLastErr{Code,String}.

  Include fetch_err.h.

 fetch_err.et: (new file)
  Error table for libfetch.

 file.c:
  Add fetchStatFile().

  Use 'struct url' instead of 'url_t'.

 ftp.c:
  Add fetchStatFTP().

  Use 'struct url' instead of 'url_t'.

  Don't use fetchLastErrCode.

 ftp.errors:
  Add categories to all error messages.

 http.c:
  Add fetchStatHTTP().

  Use 'struct url' instead of 'url_t'.

  Don't use fetchLastErr{Code,Text}.

 http.errors:
  Add categories to all error messages.

Prompted by: jkh and Eugene Skepner
Numerous sugestions from: Garett Wollman and Eugene Skepner

1 files changed, 36 insertions, 7 deletions

diff --git a/lib/libfetch/file.c b/lib/libfetch/file.c
index 0c685ef..66a681f 100644
--- a/lib/libfetch/file.c
+++ b/lib/libfetch/file.c
@@ -25,25 +25,54 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- *	$Id$
+ *	$Id: file.c,v 1.1.1.1 1998/07/09 16:52:41 des Exp $
  */
 
+#include <sys/types.h>
+#include <sys/stat.h>
 #include <stdio.h>
 #include <string.h>
 
 #include "fetch.h"
+#include "common.h"
 
 FILE *
-fetchGetFile(url_t *u, char *flags)
+fetchGetFile(struct url *u, char *flags)
 {
-    flags = flags; /* unused */
-    return fopen(u->doc, "r");
+    FILE *f;
+    
+    f = fopen(u->doc, "r");
+    
+    if (f == NULL)
+	_fetch_syserr();
+    return f;
 }
 
 FILE *
-fetchPutFile(url_t *u, char *flags)
+fetchPutFile(struct url *u, char *flags)
 {
+    FILE *f;
+    
     if (strchr(flags, 'a'))
-	return fopen(u->doc, "a");
-    else return fopen(u->doc, "w");
+	f = fopen(u->doc, "a");
+    else
+	f = fopen(u->doc, "w");
+    
+    if (f == NULL)
+	_fetch_syserr();
+    return f;
+}
+
+int
+fetchStatFile(struct url *u, struct url_stat *us, char *flags)
+{
+    struct stat sb;
+
+    if (stat(u->doc, &sb) == -1) {
+	_fetch_syserr();
+	return -1;
+    }
+    us->size = sb.st_size;
+    us->time = sb.st_mtime;
+    return 0;
 }