uniq: add -i option to ignore case

Signed-off-by: Jody Bruchon <jody@jodybruchon.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/coreutils/uniq.c b/coreutils/uniq.c
index be550b5cd..1c23e1d08 100644
--- a/coreutils/uniq.c
+++ b/coreutils/uniq.c
@@ -54,12 +54,13 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
                 OPT_f = 0x8,
                 OPT_s = 0x10,
                 OPT_w = 0x20,
+                OPT_i = 0x40,
         };
 
         skip_fields = skip_chars = 0;
         max_chars = INT_MAX;
 
-        opt = getopt32(argv, "cduf:+s:+w:+", &skip_fields, &skip_chars, &max_chars);
+        opt = getopt32(argv, "cduf:+s:+w:+i", &skip_fields, &skip_chars, &max_chars);
         argv += optind;
 
         input_filename = argv[0];
@@ -106,7 +107,12 @@ int uniq_main(int argc UNUSED_PARAM, char **argv)
                                 ++cur_compare;
                         }
 
-                        if (!old_line || strncmp(old_compare, cur_compare, max_chars)) {
+                        if (!old_line)
+                                break;
+                        if ((opt & OPT_i)
+                                ? strncasecmp(old_compare, cur_compare, max_chars)
+                                : strncmp(old_compare, cur_compare, max_chars)
+                        ) {
                                 break;
                         }