Debug: move errno testing closer to the report-writing, so we know which report caused the error.

Fix: wrptr gets the result from _snprintf, which is int, not size_t.

src/reports.c

@@ -1783,6 +1783,7 @@ int write_reports(faction * f, time_t ltime)
     bool gotit = false;
     struct report_context ctx;
     const char *encoding = "UTF-8";
+    report_type *rtype;
 
     if (noreports) {
         return false;
@@ -1798,36 +1799,42 @@ int write_reports(faction * f, time_t ltime)
         get_seen_interval(&ctx);
     }
     get_addresses(&ctx);
+    if (_access(reportpath(), 0) < 0) {
         _mkdir(reportpath());
-    do {
-        report_type *rtype = report_types;
-
+    }
+    if (errno) {
+        log_warning("errno was %d before writing reports", errno);
         errno = 0;
+    }
     if (verbosity >= 2) {
         log_printf(stdout, "Reports for %s:", factionname(f));
     }
-        for (; rtype != NULL; rtype = rtype->next) {
+    for (rtype = report_types; rtype != NULL; rtype = rtype->next) {
         if (f->options & rtype->flag) {
+            int error;
+            do {
                 char filename[MAX_PATH];
                 sprintf(filename, "%s/%d-%s.%s", reportpath(), turn, factionid(f),
                     rtype->extension);
+                error = 0;
                 if (rtype->write(filename, &ctx, encoding) == 0) {
                     gotit = true;
                 }
-            }
-        }
-
                 if (errno) {
                     char zText[64];
-            log_warning("retrying, error %d during reports for faction %s", errno, factionname(f));
+                    log_warning("retrying, error %d during %s report for faction %s", error, rtype->extension, factionname(f));
                     sprintf(zText, "waiting %u seconds before we retry", backup / 1000);
                     perror(zText);
                     _sleep(backup);
                     if (backup < maxbackup) {
                         backup *= 2;
                     }
+                    error = errno;
+                    errno = 0;
+                }
+            } while (error);
+        }
     }
-    } while (errno);
     if (!gotit) {
         log_warning("No report for faction %s!", factionid(f));
     }

src/util/bsdstring.c

@@ -7,8 +7,18 @@
 
 #include "bsdstring.h"
 
-int wrptr(char **ptr, size_t * size, size_t bytes)
+int wrptr(char **ptr, size_t * size, int result)
 {
+    size_t bytes = (size_t)result;
+    if (result < 0) {
+        // _snprintf buffer was too small
+        if (*size > 0) {
+            **ptr = 0;
+            *size = 0;
+        }
+        errno = 0;
+        return ERANGE;
+    }
     if (bytes == 0) {
         return 0;
     }

src/util/bsdstring.h

@@ -2,7 +2,7 @@
 #define UTIL_BSDSTRING_H
 
 #include <stddef.h>
-extern int wrptr(char **ptr, size_t * size, size_t bytes);
+extern int wrptr(char **ptr, size_t * size, int bytes);
 
 #ifndef HAVE_STRLCPY
 extern size_t strlcpy(char *dst, const char *src, size_t siz);
@@ -16,6 +16,7 @@ extern size_t strlcat(char *dst, const char *src, size_t siz);
 extern size_t slprintf(char * dst, size_t size, const char * format, ...);
 #endif
 
+#define WARN_STATIC_BUFFER_EX(foo) log_warning("%s: static buffer too small in %s:%d\n", (foo), __FILE__, __LINE__)
 #define WARN_STATIC_BUFFER() log_warning("static buffer too small in %s:%d\n", __FILE__, __LINE__)
 #define INFO_STATIC_BUFFER() log_info("static buffer too small in %s:%d\n", __FILE__, __LINE__)