From 342dd4f0b23469570c9b5c141a98d737ce4888be Mon Sep 17 00:00:00 2001
From: Matthias Andree <matthias.andree@gmx.de>
Date: Sun, 6 Mar 2005 01:10:31 +0000
Subject: Unmark lstat: %s: %s: for translation - no translatable strings
 inside. Be a bit more careful with swapping lists (bug report by Manfred
 Weihs). Write UIDs to a new file first and only rename it to .fetchids if
 writing completed successfully. (Suggested by Manfred Weihs.)

svn path=/trunk/; revision=4019
---
 uid.c | 38 ++++++++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 10 deletions(-)

(limited to 'uid.c')

diff --git a/uid.c b/uid.c
index b98019b9..dc88f0cd 100644
--- a/uid.c
+++ b/uid.c
@@ -134,7 +134,7 @@ void initialize_saved_lists(struct query *hostlist, const char *idfile)
     if (lstat(idfile, &statbuf) < 0) {
 	if (errno == ENOTDIR)
 	{
-	    report(stderr, GT_("lstat: %s: %s\n"), idfile, strerror(errno));
+	    report(stderr, "lstat: %s: %s\n", idfile, strerror(errno));
 	    exit(PS_IOERR);
 	}
     }
@@ -292,8 +292,7 @@ void initialize_saved_lists(struct query *hostlist, const char *idfile)
 /* return the end list element for direct modification */
 struct idlist *save_str(struct idlist **idl, const char *str, flag st)
 {
-    return *save_str_quick(idl, str ? xstrdup(str) : NULL,
-			   st);
+    return *save_str_quick(idl, str ? xstrdup(str) : NULL, st);
 }
 
 void free_str_list(struct idlist **idl)
@@ -538,11 +537,12 @@ void uid_swap_lists(struct query *ctl)
     if (ctl->newsaved)
     {
 	/* old state of mailbox may now be irrelevant */
+	struct idlist **temp = &ctl->oldsaved;
 	if (outlevel >= O_DEBUG)
 	    report(stdout, GT_("swapping UID lists\n"));
-	free_str_list(&ctl->oldsaved);
 	ctl->oldsaved = ctl->newsaved;
 	ctl->newsaved = (struct idlist *) NULL;
+	free_str_list(temp);
     }
     /* in fast uidl, there is no need to swap lists: the old state of
      * mailbox cannot be discarded! */
@@ -608,14 +608,17 @@ void write_saved_lists(struct query *hostlist, const char *idfile)
     {
 	if (outlevel >= O_DEBUG)
 	    report(stdout, GT_("Deleting fetchids file.\n"));
-	unlink(idfile);
-    }
-    else
-    {
+	if (unlink(idfile))
+	    report(stderr, GT_("Error deleting %s: %s\n"), strerror(errno));
+    } else {
+	char *newnam = xmalloc(strlen(idfile) + 2);
+	strcpy(newnam, idfile);
+	strcat(newnam, "_");
 	if (outlevel >= O_DEBUG)
 	    report(stdout, GT_("Writing fetchids file.\n"));
-	/* FIXME: do not overwrite the old idfile */
-	if ((tmpfp = fopen(idfile, "w")) != (FILE *)NULL) {
+	(void)unlink(newnam); /* remove file/link first */
+	if ((tmpfp = fopen(newnam, "w")) != (FILE *)NULL) {
+	    int errflg;
 	    for (ctl = hostlist; ctl; ctl = ctl->next) {
 		for (idp = ctl->oldsaved; idp; idp = idp->next)
 		    if (idp->val.status.mark == UID_SEEN
@@ -625,8 +628,23 @@ void write_saved_lists(struct query *hostlist, const char *idfile)
 	    }
 	    for (idp = scratchlist; idp; idp = idp->next)
 		fputs(idp->id, tmpfp);
+	    fflush(tmpfp);
+	    errflg = ferror(tmpfp);
 	    fclose(tmpfp);
+	    /* if we could write successfully, move into place;
+	     * otherwise, drop */
+	    if (errflg) {
+		report(stderr, GT_("Error writing to fetchids file %s, old file left in place.\n"), newnam);
+		unlink(newnam);
+	    } else {
+		if (rename(newnam, idfile)) {
+		    report(stderr, GT_("Cannot rename fetchids file %s to %s: %s\n"), newnam, idfile, strerror(errno));
+		}
+	    }
+	} else {
+	    report(stderr, GT_("Cannot open fetchids file %s for writing: %s\n"), newnam, strerror(errno));
 	}
+	free(newnam);
     }
 }
 #endif /* POP3_ENABLE */
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