+ grep -v # yay!

1 files changed, 15 insertions, 12 deletions

diff --git a/findutils/grep.c b/findutils/grep.c
index abdd44236..06b6980bc 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -47,7 +47,8 @@ static const char grep_usage[] =
         "\t-h\tsuppress the prefixing filename on output\n"
         "\t-i\tignore case distinctions\n"
         "\t-n\tprint line number with output lines\n"
-        "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n\n"
+        "\t-q\tbe quiet. Returns 0 if result was found, 1 otherwise\n"
+        "\t-v\tselect non-matching lines\n\n"
 #if defined BB_REGEXP
         "This version of grep matches full regular expresions.\n";
 #else
@@ -57,11 +58,12 @@ static const char grep_usage[] =
 static int match = FALSE, beQuiet = FALSE;
 
 static void do_grep(FILE * fp, char *needle, char *fileName, int tellName,
-                                        int ignoreCase, int tellLine)
+                                        int ignoreCase, int tellLine, int invertSearch)
 {
         char *cp;
         long line = 0;
         char haystack[BUF_SIZE];
+        int  truth = !invertSearch;
 
         while (fgets(haystack, sizeof(haystack), fp)) {
                 line++;
@@ -70,7 +72,7 @@ static void do_grep(FILE * fp, char *needle, char *fileName, int tellName,
                 if (*cp != '\n')
                         fprintf(stderr, "%s: Line too long\n", fileName);
 
-                if (find_match(haystack, needle, ignoreCase) == TRUE) {
+                if (find_match(haystack, needle, ignoreCase) == truth) {
                         if (tellName == TRUE)
                                 printf("%s:", fileName);
 
@@ -92,13 +94,10 @@ extern int grep_main(int argc, char **argv)
         char *cp;
         char *needle;
         char *fileName;
-        int tellName = TRUE;
-        int ignoreCase = TRUE;
-        int tellLine = FALSE;
-
-
-        ignoreCase = FALSE;
-        tellLine = FALSE;
+        int tellName     = TRUE;
+        int ignoreCase   = FALSE;
+        int tellLine     = FALSE;
+        int invertSearch = FALSE;
 
         argc--;
         argv++;
@@ -128,6 +127,10 @@ extern int grep_main(int argc, char **argv)
                                 beQuiet = TRUE;
                                 break;
 
+                        case 'v':
+                                invertSearch = TRUE;
+                                break;
+
                         default:
                                 usage(grep_usage);
                         }
@@ -137,7 +140,7 @@ extern int grep_main(int argc, char **argv)
         argc--;
 
         if (argc == 0) {
-                do_grep(stdin, needle, "stdin", FALSE, ignoreCase, tellLine);
+                do_grep(stdin, needle, "stdin", FALSE, ignoreCase, tellLine, invertSearch);
         } else {
                 /* Never print the filename for just one file */
                 if (argc == 1)
@@ -151,7 +154,7 @@ extern int grep_main(int argc, char **argv)
                                 continue;
                         }
 
-                        do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine);
+                        do_grep(fp, needle, fileName, tellName, ignoreCase, tellLine, invertSearch);
 
                         if (ferror(fp))
                                 perror(fileName);