X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;ds=sidebyside;f=findutils%2Fgrep.c;h=b072cd44126f7f4abb16dcc0fa3edde752d47226;hb=47cfbf32fd66563f8c4e09ad6cced6abfbe2fad5;hp=f14d6e6c1cf67e67afa0cb35de3e0980494f8d43;hpb=cd09e81520b7917adebcffd7c361671f913325eb;p=oweals%2Fbusybox.git

diff --git a/findutils/grep.c b/findutils/grep.c
index f14d6e6c1..b072cd441 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -58,6 +58,7 @@
 //config:	  Print the specified number of context lines (-C).
 
 #include "libbb.h"
+#include "common_bufsiz.h"
 #include "xregex.h"
 
 
@@ -201,11 +202,10 @@ struct globals {
 	llist_t *pattern_head;   /* growable list of patterns to match */
 	const char *cur_file;    /* the current file we are reading */
 } FIX_ALIASING;
-#define G (*(struct globals*)&bb_common_bufsiz1)
+#define G (*(struct globals*)bb_common_bufsiz1)
 #define INIT_G() do { \
-	struct G_sizecheck { \
-		char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
-	}; \
+	setup_common_bufsiz(); \
+	BUILD_BUG_ON(sizeof(G) > COMMON_BUFSIZE); \
 } while (0)
 #define max_matches       (G.max_matches         )
 #if !ENABLE_EXTRA_COMPAT
@@ -344,11 +344,42 @@ static int grep_file(FILE *file)
 		while (pattern_ptr) {
 			gl = (grep_list_data_t *)pattern_ptr->data;
 			if (FGREP_FLAG) {
-				found |= (((option_mask32 & OPT_i)
-					? strcasestr(line, gl->pattern)
-					: strstr(line, gl->pattern)
-					) != NULL);
+				char *match;
+				char *str = line;
+ opt_f_again:
+				match = ((option_mask32 & OPT_i)
+					? strcasestr(str, gl->pattern)
+					: strstr(str, gl->pattern)
+					);
+				if (match) {
+					if (option_mask32 & OPT_x) {
+						if (match != str)
+							goto opt_f_not_found;
+						if (str[strlen(gl->pattern)] != '\0')
+							goto opt_f_not_found;
+					} else
+					if (option_mask32 & OPT_w) {
+						char c = (match != str) ? match[-1] : ' ';
+						if (!isalnum(c) && c != '_') {
+							c = match[strlen(gl->pattern)];
+							if (!c || (!isalnum(c) && c != '_'))
+								goto opt_f_found;
+						}
+						str = match + 1;
+						goto opt_f_again;
+					}
+ opt_f_found:
+					found = 1;
+ opt_f_not_found: ;
+				}
 			} else {
+#if ENABLE_EXTRA_COMPAT
+				unsigned start_pos;
+#else
+				int match_flg;
+#endif
+				char *match_at;
+
 				if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
 					gl->flg_mem_alocated_compiled |= COMPILED;
 #if !ENABLE_EXTRA_COMPAT
@@ -363,29 +394,58 @@ static int grep_file(FILE *file)
 #if !ENABLE_EXTRA_COMPAT
 				gl->matched_range.rm_so = 0;
 				gl->matched_range.rm_eo = 0;
+				match_flg = 0;
+#else
+				start_pos = 0;
 #endif
+				match_at = line;
+ opt_w_again:
+//bb_error_msg("'%s' start_pos:%d line_len:%d", match_at, start_pos, line_len);
 				if (
 #if !ENABLE_EXTRA_COMPAT
-					regexec(&gl->compiled_regex, line, 1, &gl->matched_range, 0) == 0
+					regexec(&gl->compiled_regex, match_at, 1, &gl->matched_range, match_flg) == 0
 #else
-					re_search(&gl->compiled_regex, line, line_len,
-							/*start:*/ 0, /*range:*/ line_len,
+					re_search(&gl->compiled_regex, match_at, line_len,
+							start_pos, /*range:*/ line_len,
 							&gl->matched_range) >= 0
 #endif
 				) {
 					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)) {
+						         && match_at[gl->matched_range.rm_eo] == '\0');
+					} else
+					if (!(option_mask32 & OPT_w)) {
 						found = 1;
 					} else {
 						char c = ' ';
-						if (gl->matched_range.rm_so)
-							c = line[gl->matched_range.rm_so - 1];
+						if (match_at > line || gl->matched_range.rm_so != 0) {
+							c = match_at[gl->matched_range.rm_so - 1];
+						}
 						if (!isalnum(c) && c != '_') {
-							c = line[gl->matched_range.rm_eo];
-							if (!c || (!isalnum(c) && c != '_'))
-								found = 1;
+							c = match_at[gl->matched_range.rm_eo];
+						}
+						if (!isalnum(c) && c != '_') {
+							found = 1;
+						} else {
+			/*
+			 * Why check gl->matched_range.rm_eo?
+			 * Zero-length match makes -w skip the line:
+			 * "echo foo | grep ^" prints "foo",
+			 * "echo foo | grep -w ^" prints nothing.
+			 * Without such check, we can loop forever.
+			 */
+#if !ENABLE_EXTRA_COMPAT
+							if (gl->matched_range.rm_eo != 0) {
+								match_at += gl->matched_range.rm_eo;
+								match_flg |= REG_NOTBOL;
+								goto opt_w_again;
+							}
+#else
+							if (gl->matched_range.rm_eo > start_pos) {
+								start_pos = gl->matched_range.rm_eo;
+								goto opt_w_again;
+							}
+#endif
 						}
 					}
 				}
@@ -608,7 +668,7 @@ static int grep_dir(const char *dir)
 	int matched = 0;
 	recursive_action(dir,
 		/* recurse=yes */ ACTION_RECURSE |
-		/* followLinks=no */
+		/* followLinks=command line only */ ACTION_FOLLOWLINKS_L0 |
 		/* depthFirst=yes */ ACTION_DEPTHFIRST,
 		/* fileAction= */ file_action_grep,
 		/* dirAction= */ NULL,
@@ -623,11 +683,15 @@ int grep_main(int argc UNUSED_PARAM, char **argv)
 	FILE *file;
 	int matched;
 	llist_t *fopt = NULL;
-
-	/* do normal option parsing */
 #if ENABLE_FEATURE_GREP_CONTEXT
 	int Copt, opts;
+#endif
 
+	/* For grep, exitcode of 1 is "not found". Other errors are 2: */
+	xfunc_error_retval = 2;
+
+	/* do normal option parsing */
+#if ENABLE_FEATURE_GREP_CONTEXT
 	/* -H unsets -h; -C unsets -A,-B; -e,-f are lists;
 	 * -m,-A,-B,-C have numeric param */
 	opt_complementary = "H-h:C-AB:e::f::m+:A+:B+:C+";
@@ -638,7 +702,7 @@ int grep_main(int argc UNUSED_PARAM, char **argv)
 
 	if (opts & OPT_C) {
 		/* -C unsets prev -A and -B, but following -A or -B
-		   may override it */
+		 * may override it */
 		if (!(opts & OPT_A)) /* not overridden */
 			lines_after = Copt;
 		if (!(opts & OPT_B)) /* not overridden */
@@ -683,7 +747,7 @@ int grep_main(int argc UNUSED_PARAM, char **argv)
 		option_mask32 |= OPT_F;
 
 #if !ENABLE_EXTRA_COMPAT
-	if (!(option_mask32 & (OPT_o | OPT_w)))
+	if (!(option_mask32 & (OPT_o | OPT_w | OPT_x)))
 		reflags = REG_NOSUB;
 #endif