use a macro for the format string

this makes things slightly more robust as changing the string inside the
macro would automatically change the malloc size.

diff --git a/src/nnn.c b/src/nnn.c
index bd342362ab76b8061b81bf338c20cc07e3197ed3..c6001abedbd3c541ca902366fa8e5aacd471cfd4 100644 (file)
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -2719,10 +2719,10 @@ static void get_archive_cmd(char *cmd, const char *archive)
        xstrsncpy(cmd, archive_cmd[i], ARCHIVE_CMD_LEN);
 }
 
+#define CMD_FMT " -ze 's|^%s/||' '%s' | xargs -0 %s %s"
 static void archive_selection(const char *cmd, const char *archive, const char *curpath)
 {
-       /* The 38 comes from the format string below */
-       char *buf = malloc((38 + xstrlen(cmd) + xstrlen(archive)
+       char *buf = malloc((sizeof(CMD_FMT) + xstrlen(cmd) + xstrlen(archive)
                               + xstrlen(curpath) + xstrlen(selpath)) * sizeof(char));
        if (!buf) {
                DPRINTF_S(strerror(errno));
@@ -2730,12 +2730,11 @@ static void archive_selection(const char *cmd, const char *archive, const char *
                return;
        }
 
-       snprintf(buf, CMD_LEN_MAX,
-               SED" -ze 's|^%s/||' '%s' | xargs -0 %s %s", curpath, selpath, cmd, archive
-               );
+       snprintf(buf, CMD_LEN_MAX, SED CMD_FMT, curpath, selpath, cmd, archive);
        spawn(utils[UTIL_SH_EXEC], buf, NULL, NULL, F_CLI | F_CONFIRM);
        free(buf);
 }
+#undef CMD_FMT
 
 static void write_lastdir(const char *curpath, const char *outfile)
 {