[libiberty] output empty args as a pair of quotes

writeargv writes out empty arguments in a way that expandargv skips
them instead of preserving them.  Fixed by writing out a pair of
quotes for them.

for  libiberty/ChangeLog

	* argv.c (writeargv): Output empty args as "".

diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index c2bab93..17903ea 100644 (file)
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,7 @@
+2020-01-23  Alexandre Oliva <oliva@adacore.com>
+
+       * argv.c (writeargv): Output empty args as "".
+
 2020-01-01  Jakub Jelinek  <jakub@redhat.com>
 
        Update copyright years.

diff --git a/libiberty/argv.c b/libiberty/argv.c
index 8c9794d..6a72208 100644 (file)
--- a/libiberty/argv.c
+++ b/libiberty/argv.c
@@ -327,6 +327,14 @@ writeargv (char * const *argv, FILE *f)
           arg++;
         }
 
+      /* Write out a pair of quotes for an empty argument.  */
+      if (arg == *argv)
+       if (EOF == fputs ("\"\"", f))
+         {
+           status = 1;
+           goto done;
+         }
+
       if (EOF == fputc ('\n', f))
         {
           status = 1;