(Pkg_build_info) Increase static buffer size by 50%

Rationale:
when generating synthesys, there's one new pkg whose provides were not
emitted in synthesis because its provides would overflow the static
buffer by 2 bytes:
"buffer overflow: 131074 < 131072 for provides"

Also log when the buffer would be too small instead of silently ignoring
the issue.

The offending package is golang-github-azure-sdk-devel which has 2707
provides which translates to a 131074 characters line in synthesys.

2 files changed, 5 insertions, 1 deletions

diff --git a/Changes b/Changes
index f61181a..8e6c3e5 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,5 @@
+- Bump static buffer size when generating synthesys
+
 Version 5.125 - 23 October 2021
 
 - Further prevent SRPM to conflicts with its own build deps with rpm-4.16+
diff --git a/URPM.xs b/URPM.xs
index 51d416c..543388d 100644
--- a/URPM.xs
+++ b/URPM.xs
@@ -2177,7 +2177,7 @@ Pkg_build_info(pkg, fileno, provides_files=NULL, recommends=0)
   int recommends
   CODE:
   if (pkg->info) {
-    char buff[65536*2];
+    char buff[65536*3];
     UV size;
 
     /* info line should be the last to be written */
@@ -2189,6 +2189,8 @@ Pkg_build_info(pkg, fileno, provides_files=NULL, recommends=0)
 	  size += snprintf(buff+size, sizeof(buff)-size, "@%s\n", provides_files);
 	}
 	write_nocheck(fileno, buff, size);
+      } else {
+	fprintf(stderr, "buffer overflow: %d < %d for provides\n", size, sizeof(buff));
       }
     }
     if (pkg->conflicts && *pkg->conflicts) {