t9300: factor out portable "head -c" replacement

diff --git a/bisect.c b/bisect.c
index 7996c2907b0e571578f2ce18095c83c134a503b3..6d93edbcb97382269bd310d38cacd95ce3619091 100644 (file)
--- a/bisect.c
+++ b/bisect.c
@@ -860,8 +860,8 @@ static void check_good_are_ancestors_of_bad(const char *prefix, int no_checkout)
        /* Create file BISECT_ANCESTORS_OK. */
        fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY, 0600);
        if (fd < 0)
-               warning("could not create file '%s': %s",
-                       filename, strerror(errno));
+               warning_errno("could not create file '%s'",
+                             filename);
        else
                close(fd);
  done:
@@ -910,8 +910,7 @@ void read_bisect_terms(const char **read_bad, const char **read_good)
                        *read_good = "good";
                        return;
                } else {
-                       die("could not read file '%s': %s", filename,
-                               strerror(errno));
+                       die_errno("could not read file '%s'", filename);
                }
        } else {
                strbuf_getline_lf(&str, fp);