1 files changed, 14 insertions, 34 deletions
diff --git a/tail.c b/tail.c
index 308bb3085..5f0381882 100644
--- a/tail.c
+++ b/tail.c
@@ -61,6 +61,13 @@ static char verbose = 0;
 static off_t units=0;
+static struct suffix_mult tail_suffixes[] = {
+        { "b", 512 },
+        { "k", 1024 },
+        { "m", 1048576 },
+        { NULL, 0 }
+};
 static int tail_stream(int fd)
 {
        ssize_t startpoint;
@@ -170,32 +177,6 @@ int tail_main(int argc, char **argv)
                switch (opt) {
 #ifndef BB_FEATURE_SIMPLE_TAIL
-                case 'c':
-                        unit_type = BYTES;
-                        test = atoi(optarg);
-                        if(test==0)
-                                usage(tail_usage);
-                        if(optarg[strlen(optarg)-1]>'9') {
-                                switch (optarg[strlen(optarg)-1]) {
-                                case 'b':
-                                        test *= 512;
-                                        break;
-                                case 'k':
-                                        test *= 1024;
-                                        break;
-                                case 'm':
-                                        test *= (1024 * 1024);
-                                        break;
-                                default:
-                                        fprintf(stderr,"Size must be b,k, or m.");
-                                        usage(tail_usage);
-                                }
-                        }
-                        if(optarg[0]=='+')
-                                units=test+1;
-                        else
-                                units=-(test+1);
-                        break;
                case 'q':
                        show_headers = 0;
                        break;
@@ -207,15 +188,12 @@ int tail_main(int argc, char **argv)
                case 'v':
                        verbose = 1;
                        break;
+                case 'c':
+                        unit_type = BYTES;
+                        /* FALLS THROUGH */
 #endif
-                case 'f':
-                        follow = 1;
-                        break;
-                case 'h':
-                        usage(tail_usage);
-                        break;
                case 'n':
-                        test = atoi(optarg);
+                        test = parse_number(optarg, tail_suffixes);
                        if (test) {
                                if (optarg[0] == '+')
                                        units = test;
@@ -224,8 +202,10 @@ int tail_main(int argc, char **argv)
                        } else
                                usage(tail_usage);
                        break;
+                case 'f':
+                        follow = 1;
+                        break;
                default:
-                        error_msg("\nUnknown arg: %c.\n\n",optopt);
                        usage(tail_usage);
                }
        }