grep: support for -x, match whole line

Specified in POSIX.
http://pubs.opengroup.org/onlinepubs/009604499/utilities/grep.html

Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/findutils/grep.c b/findutils/grep.c
index 5f4224203..f14d6e6c1 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -85,6 +85,7 @@
 //usage:     "\n        -r      Recurse"
 //usage:     "\n        -i      Ignore case"
 //usage:     "\n        -w      Match whole words only"
+//usage:     "\n        -x      Match whole lines only"
 //usage:     "\n        -F      PATTERN is a literal (not regexp)"
 //usage:        IF_FEATURE_GREP_EGREP_ALIAS(
 //usage:     "\n        -E      PATTERN is an extended regexp"
@@ -113,7 +114,7 @@
 //usage:#define fgrep_full_usage ""
 
 #define OPTSTR_GREP \
-        "lnqvscFiHhe:f:Lorm:w" \
+        "lnqvscFiHhe:f:Lorm:wx" \
         IF_FEATURE_GREP_CONTEXT("A:B:C:") \
         IF_FEATURE_GREP_EGREP_ALIAS("E") \
         IF_EXTRA_COMPAT("z") \
@@ -138,6 +139,7 @@ enum {
         OPTBIT_r, /* recurse dirs */
         OPTBIT_m, /* -m MAX_MATCHES */
         OPTBIT_w, /* -w whole word match */
+        OPTBIT_x, /* -x whole line match */
         IF_FEATURE_GREP_CONTEXT(    OPTBIT_A ,) /* -A NUM: after-match context */
         IF_FEATURE_GREP_CONTEXT(    OPTBIT_B ,) /* -B NUM: before-match context */
         IF_FEATURE_GREP_CONTEXT(    OPTBIT_C ,) /* -C NUM: -A and -B combined */
@@ -160,6 +162,7 @@ enum {
         OPT_r = 1 << OPTBIT_r,
         OPT_m = 1 << OPTBIT_m,
         OPT_w = 1 << OPTBIT_w,
+        OPT_x = 1 << OPTBIT_x,
         OPT_A = IF_FEATURE_GREP_CONTEXT(    (1 << OPTBIT_A)) + 0,
         OPT_B = IF_FEATURE_GREP_CONTEXT(    (1 << OPTBIT_B)) + 0,
         OPT_C = IF_FEATURE_GREP_CONTEXT(    (1 << OPTBIT_C)) + 0,
@@ -370,9 +373,12 @@ static int grep_file(FILE *file)
                                                         &gl->matched_range) >= 0
 #endif
                                 ) {
-                                        if (!(option_mask32 & OPT_w))
+                                        if (option_mask32 & OPT_x) {
+                                                found = (gl->matched_range.rm_so == 0
+                                                         && line[gl->matched_range.rm_eo] == '\0');
+                                        } else if (!(option_mask32 & OPT_w)) {
                                                 found = 1;
-                                        else {
+                                        } else {
                                                 char c = ' ';
                                                 if (gl->matched_range.rm_so)
                                                         c = line[gl->matched_range.rm_so - 1];