sed: fix a case when one-line range matches past lines. Closes bug 1867.

function                                             old     new   delta
process_files                                       2096    2107     +11
add_cmd                                             1142    1132     -10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 1/1 up/down: 11/-10)              Total: 1 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

2 files changed, 33 insertions, 15 deletions

diff --git a/editors/sed.c b/editors/sed.c
index 4bd6e0168..7fe2809b3 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -119,10 +119,10 @@ struct globals {
         } pipeline;
 } FIX_ALIASING;
 #define G (*(struct globals*)&bb_common_bufsiz1)
-void BUG_sed_globals_too_big(void);
+struct BUG_G_too_big {
+        char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
+};
 #define INIT_G() do { \
-        if (sizeof(struct globals) > COMMON_BUFSIZE) \
-                BUG_sed_globals_too_big(); \
         G.sed_cmd_tail = &G.sed_cmd_head; \
 } while (0)
 
@@ -385,7 +385,8 @@ static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
                         break;
                 /* Comment */
                 case '#':
-                        while (substr[++idx]) /*skip all*/;
+                        // while (substr[++idx]) continue;
+                        idx += strlen(substr + idx); // same
                         /* Fall through */
                 /* End of command */
                 case ';':
@@ -395,7 +396,7 @@ static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
                         bb_error_msg_and_die("bad option in substitution expression");
                 }
         }
-out:
+ out:
         /* compile the match string into a regex */
         if (*match != '\0') {
                 /* If match is empty, we use last regex used at runtime */
@@ -896,13 +897,32 @@ static void process_files(void)
 
                 /* Determine if this command matches this line: */
 
+                //bb_error_msg("match1:%d", sed_cmd->in_match);
+                //bb_error_msg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
+                //              && !sed_cmd->beg_match && !sed_cmd->end_match));
+                //bb_error_msg("match3:%d", (sed_cmd->beg_line > 0
+                //      && (sed_cmd->end_line || sed_cmd->end_match
+                //          ? (sed_cmd->beg_line <= linenum)
+                //          : (sed_cmd->beg_line == linenum)
+                //          )
+                //      )
+                //bb_error_msg("match4:%d", (beg_match(sed_cmd, pattern_space)));
+                //bb_error_msg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
+
                 /* Are we continuing a previous multi-line match? */
                 sed_cmd->in_match = sed_cmd->in_match
                         /* Or is no range necessary? */
                         || (!sed_cmd->beg_line && !sed_cmd->end_line
                                 && !sed_cmd->beg_match && !sed_cmd->end_match)
                         /* Or did we match the start of a numerical range? */
-                        || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line <= linenum))
+                        || (sed_cmd->beg_line > 0
+                            && (sed_cmd->end_line || sed_cmd->end_match
+                                  /* note: even if end numeric and is < linenum too,
+                                   * GNU sed matches! We match too */
+                                ? (sed_cmd->beg_line <= linenum)    /* N,end */
+                                : (sed_cmd->beg_line == linenum)    /* N */
+                                )
+                            )
                         /* Or does this line match our begin address regex? */
                         || (beg_match(sed_cmd, pattern_space))
                         /* Or did we match last line of input? */
@@ -976,7 +996,6 @@ static void process_files(void)
                 case 'P':
                 {
                         char *tmp = strchr(pattern_space, '\n');
-
                         if (tmp) {
                                 *tmp = '\0';
                                 /* TODO: explain why '\n' below */
@@ -999,11 +1018,8 @@ static void process_files(void)
                 case 'D':
                 {
                         char *tmp = strchr(pattern_space, '\n');
-
                         if (tmp) {
-                                tmp = xstrdup(tmp+1);
-                                free(pattern_space);
-                                pattern_space = tmp;
+                                overlapping_strcpy(pattern_space, tmp + 1);
                                 goto restart;
                         }
                 }
@@ -1048,7 +1064,6 @@ static void process_files(void)
                 case 'r':
                 {
                         FILE *rfile;
-
                         rfile = fopen_for_read(sed_cmd->string);
                         if (rfile) {
                                 char *line;
@@ -1097,12 +1112,11 @@ static void process_files(void)
                         int len;
                         /* If no next line, jump to end of script and exit. */
                         if (next_line == NULL) {
-                                /* Jump to end of script and exit */
                                 free(next_line);
                                 next_line = NULL;
                                 goto discard_line;
-                        /* append next_line, read new next_line. */
                         }
+                        /* Append next_line, read new next_line. */
                         len = strlen(pattern_space);
                         pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
                         pattern_space[len] = '\n';
@@ -1131,7 +1145,6 @@ static void process_files(void)
                 case 'y':
                 {
                         int i, j;
-
                         for (i = 0; pattern_space[i]; i++) {
                                 for (j = 0; sed_cmd->string[j]; j += 2) {
                                         if (pattern_space[i] == sed_cmd->string[j]) {
diff --git a/testsuite/sed.tests b/testsuite/sed.tests
index 88b9c4e4b..3301a25f8 100755
--- a/testsuite/sed.tests
+++ b/testsuite/sed.tests
@@ -270,6 +270,11 @@ testing "sed a cmd ended by double backslash" \
         | two \\
 '
 
+# fisrt three lines are deleted; 4th line is matched and printed by "2,3" and by "4" ranges
+testing "sed with N skipping lines past ranges on next cmds" \
+        "sed -n '1{N;N;d};1p;2,3p;3p;4p'" \
+        "4\n4\n" "" "1\n2\n3\n4\n"
+
 # testing "description" "arguments" "result" "infile" "stdin"
 
 exit $FAILCOUNT