sed: fix possible case of signed char bug; expand debugging printouts

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

diff --git a/editors/sed.c b/editors/sed.c
index c8bb503..4e9babb 100644 (file)
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -282,7 +282,7 @@ static int index_of_next_unescaped_regexp_delim(int delimiter, const char *str)
 static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
 {
        const char *cmdstr_ptr = cmdstr;
-       char delimiter;
+       unsigned char delimiter;
        int idx = 0;
 
        /* verify that the 's' or 'y' is followed by something.  That something
@@ -297,7 +297,7 @@ static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
 
        /* save the replacement string */
        cmdstr_ptr += idx + 1;
-       idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
+       idx = index_of_next_unescaped_regexp_delim(- (int)delimiter, cmdstr_ptr);
        *replace = copy_parsing_escapes(cmdstr_ptr, idx);
 
        return ((cmdstr_ptr - cmdstr) + idx);
@@ -322,10 +322,11 @@ static int get_address(const char *my_str, int *linenum, regex_t ** regex)
                char *temp;
 
                delimiter = '/';
-               if (*my_str == '\\') delimiter = *++pos;
+               if (*my_str == '\\')
+                       delimiter = *++pos;
                next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
                temp = copy_parsing_escapes(pos, next);
-               *regex = xmalloc(sizeof(regex_t));
+               *regex = xzalloc(sizeof(regex_t));
                xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
                free(temp);
                /* Move position to next character after last delimiter */
@@ -434,8 +435,10 @@ static int parse_subst_cmd(sed_cmd_t *sed_cmd, const char *substr)
        /* compile the match string into a regex */
        if (*match != '\0') {
                /* If match is empty, we use last regex used at runtime */
-               sed_cmd->sub_match = xmalloc(sizeof(regex_t));
+               sed_cmd->sub_match = xzalloc(sizeof(regex_t));
+               dbg("xregcomp('%s',%x)", match, cflags);
                xregcomp(sed_cmd->sub_match, match, cflags);
+               dbg("regcomp ok");
        }
        free(match);
 
@@ -717,8 +720,12 @@ static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
        G.previous_regex_ptr = current_regex;
 
        /* Find the first match */
-       if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0))
+       dbg("matching '%s'", line);
+       if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0)) {
+               dbg("no match");
                return 0;
+       }
+       dbg("match");
 
        /* Initialize temporary output buffer. */
        G.pipeline.buf = xmalloc(PIPE_GROW);
@@ -730,9 +737,10 @@ static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
                int i;
 
                /* Work around bug in glibc regexec, demonstrated by:
-                  echo " a.b" | busybox sed 's [^ .]* x g'
-                  The match_count check is so not to break
-                  echo "hi" | busybox sed 's/^/!/g' */
+                * echo " a.b" | busybox sed 's [^ .]* x g'
+                * The match_count check is so not to break
+                * echo "hi" | busybox sed 's/^/!/g'
+                */
                if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
                        pipe_putc(*line++);
                        continue;
@@ -763,11 +771,14 @@ static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
                altered++;
 
                /* if we're not doing this globally, get out now */
-               if (sed_cmd->which_match)
+               if (sed_cmd->which_match != 0)
+                       break;
+
+               if (*line == '\0')
                        break;
 
 //maybe (G.regmatch[0].rm_eo ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
-       } while (*line && regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
+       } while (regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
 
        /* Copy rest of string into output pipeline */
        while (1) {
@@ -1067,8 +1078,8 @@ static void process_files(void)
                }
 
                /* actual sedding */
-               //bb_error_msg("pattern_space:'%s' next_line:'%s' cmd:%c",
-               //pattern_space, next_line, sed_cmd->cmd);
+               dbg("pattern_space:'%s' next_line:'%s' cmd:%c",
+                               pattern_space, next_line, sed_cmd->cmd);
                switch (sed_cmd->cmd) {
 
                /* Print line number */
@@ -1115,6 +1126,7 @@ static void process_files(void)
                case 's':
                        if (!do_subst_command(sed_cmd, &pattern_space))
                                break;
+                       dbg("do_subst_command succeeeded:'%s'", pattern_space);
                        substituted |= 1;
 
                        /* handle p option */