(main): Use xstrtol instead of atoi.

diff --git a/src/uniq.c b/src/uniq.c
index aa2b4e4..2d261de 100644 (file)
--- a/src/uniq.c
+++ b/src/uniq.c
@@ -25,10 +25,24 @@
 #include <stdio.h>
 #include <getopt.h>
 #include <sys/types.h>
+
+#if HAVE_LIMITS_H
+# include <limits.h>
+#endif
+
+#ifndef UINT_MAX
+# define UINT_MAX ((unsigned int) ~(unsigned int) 0)
+#endif
+
+#ifndef INT_MAX
+# define INT_MAX ((int) (UINT_MAX >> 1))
+#endif
+
 #include "system.h"
 #include "linebuffer.h"
 #include "version.h"
 #include "error.h"
+#include "xstrtol.h"
 
 /* Undefine, to avoid warning about redefinition on some systems.  */
 #undef min
@@ -302,11 +316,25 @@ main (int argc, char **argv)
          break;
 
        case 'f':               /* Like '-#'. */
-         skip_fields = atoi (optarg);
+         {
+           long int tmp_long;
+           if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
+               || tmp_long <= 0 || tmp_long > INT_MAX)
+             error (1, 0, _("invalid number of fields to skip: `%s'"),
+                    optarg);
+           skip_fields = (int) tmp_long;
+         }
          break;
 
        case 's':               /* Like '+#'. */
-         skip_chars = atoi (optarg);
+         {
+           long int tmp_long;
+           if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
+               || tmp_long <= 0 || tmp_long > INT_MAX)
+             error (1, 0, _("invalid number of bytes to skip: `%s'"),
+                    optarg);
+           skip_chars = (int) tmp_long;
+         }
          break;
 
        case 'u':
@@ -314,7 +342,14 @@ main (int argc, char **argv)
          break;
 
        case 'w':
-         check_chars = atoi (optarg);
+         {
+           long int tmp_long;
+           if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
+               || tmp_long <= 0 || tmp_long > INT_MAX)
+             error (1, 0, _("invalid number of bytes to compare: `%s'"),
+                    optarg);
+           check_chars = (int) tmp_long;
+         }
          break;
 
        default:
@@ -336,7 +371,15 @@ main (int argc, char **argv)
       /* Interpret non-option arguments with leading `+' only
         if we haven't seen `--'.  */
       while (optind < argc && argv[optind][0] == '+')
-       skip_chars = atoi (argv[optind++]);
+       {
+         char *opt_str = argv[optind++];
+         long int tmp_long;
+         if (xstrtol (opt_str, NULL, 10, &tmp_long, NULL) != LONGINT_OK
+             || tmp_long <= 0 || tmp_long > INT_MAX)
+           error (1, 0, _("invalid number of bytes to compare: `%s'"),
+                  opt_str);
+         skip_chars = (int) tmp_long;
+       }
     }
 
   if (optind < argc)