maint: refactor printing of backup suffix --help

* src/system.h (emit_backup_suffix_note): A new function to
output the backup suffix info.  The strings are unchanged,
so translations are not impacted.
* src/cp.c (usage): Use the new function.
* src/ln.c (usage): Likewise.
* src/mv.c (usage): Likewise.
* src/install.c (usage): Likewise.

5 files changed, 22 insertions, 52 deletions

diff --git a/src/cp.c b/src/cp.c
index 79b93bd8e..97a868a53 100644
--- a/src/cp.c
+++ b/src/cp.c
@@ -250,19 +250,7 @@ When --reflink[=always] is specified, perform a lightweight copy, where the\n\
 data blocks are copied only when modified.  If this is not possible the copy\n\
 fails, or if --reflink=auto is specified, fall back to a standard copy.\n\
 "), stdout);
-      fputs (_("\
-\n\
-The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
-The version control method may be selected via the --backup option or through\n\
-the VERSION_CONTROL environment variable.  Here are the values:\n\
-\n\
-"), stdout);
-      fputs (_("\
-  none, off       never make backups (even if --backup is given)\n\
-  numbered, t     make numbered backups\n\
-  existing, nil   numbered if numbered backups exist, simple otherwise\n\
-  simple, never   always make simple backups\n\
-"), stdout);
+      emit_backup_suffix_note ();
       fputs (_("\
 \n\
 As a special case, cp makes a backup of SOURCE when the force and backup\n\
diff --git a/src/install.c b/src/install.c
index b4b282aae..4fa4bb3d3 100644
--- a/src/install.c
+++ b/src/install.c
@@ -681,19 +681,7 @@ In the 4th form, create all components of the given DIRECTORY(ies).\n\
 
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
-      fputs (_("\
-\n\
-The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
-The version control method may be selected via the --backup option or through\n\
-the VERSION_CONTROL environment variable.  Here are the values:\n\
-\n\
-"), stdout);
-      fputs (_("\
-  none, off       never make backups (even if --backup is given)\n\
-  numbered, t     make numbered backups\n\
-  existing, nil   numbered if numbered backups exist, simple otherwise\n\
-  simple, never   always make simple backups\n\
-"), stdout);
+      emit_backup_suffix_note ();
       emit_ancillary_info (PROGRAM_NAME);
     }
   exit (status);
diff --git a/src/ln.c b/src/ln.c
index 0b8eb219b..2a56dc973 100644
--- a/src/ln.c
+++ b/src/ln.c
@@ -436,19 +436,7 @@ interpreted in relation to its parent directory.\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
-      fputs (_("\
-\n\
-The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
-The version control method may be selected via the --backup option or through\n\
-the VERSION_CONTROL environment variable.  Here are the values:\n\
-\n\
-"), stdout);
-      fputs (_("\
-  none, off       never make backups (even if --backup is given)\n\
-  numbered, t     make numbered backups\n\
-  existing, nil   numbered if numbered backups exist, simple otherwise\n\
-  simple, never   always make simple backups\n\
-"), stdout);
+      emit_backup_suffix_note ();
       printf (_("\
 \n\
 Using -s ignores -L and -P.  Otherwise, the last option specified controls\n\
diff --git a/src/mv.c b/src/mv.c
index 35b2e929f..6a3d0d277 100644
--- a/src/mv.c
+++ b/src/mv.c
@@ -323,19 +323,7 @@ If you specify more than one of -i, -f, -n, only the final one takes effect.\n\
 "), stdout);
       fputs (HELP_OPTION_DESCRIPTION, stdout);
       fputs (VERSION_OPTION_DESCRIPTION, stdout);
-      fputs (_("\
-\n\
-The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
-The version control method may be selected via the --backup option or through\n\
-the VERSION_CONTROL environment variable.  Here are the values:\n\
-\n\
-"), stdout);
-      fputs (_("\
-  none, off       never make backups (even if --backup is given)\n\
-  numbered, t     make numbered backups\n\
-  existing, nil   numbered if numbered backups exist, simple otherwise\n\
-  simple, never   always make simple backups\n\
-"), stdout);
+      emit_backup_suffix_note ();
       emit_ancillary_info (PROGRAM_NAME);
     }
   exit (status);
diff --git a/src/system.h b/src/system.h
index 1b7a0fbb3..e82dce498 100644
--- a/src/system.h
+++ b/src/system.h
@@ -609,6 +609,24 @@ Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).\n\
 }
 
 static inline void
+emit_backup_suffix_note (void)
+{
+  fputs (_("\
+\n\
+The backup suffix is '~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
+The version control method may be selected via the --backup option or through\n\
+the VERSION_CONTROL environment variable.  Here are the values:\n\
+\n\
+"), stdout);
+  fputs (_("\
+  none, off       never make backups (even if --backup is given)\n\
+  numbered, t     make numbered backups\n\
+  existing, nil   numbered if numbered backups exist, simple otherwise\n\
+  simple, never   always make simple backups\n\
+"), stdout);
+}
+
+static inline void
 emit_ancillary_info (char const *program)
 {
   struct infomap { char const *program; char const *node; } const infomap[] = {