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authorMatt Kraai2001-08-20 21:21:06 +0000
committerMatt Kraai2001-08-20 21:21:06 +0000
commita3e4f455ac0265d9f2477300054f504f563b0c58 (patch)
tree96448b8b00f4d257a9820963635044ef93935d75
parent54eceffcae3ebf1664e54ba2b32298856a2c4930 (diff)
downloadbusybox-a3e4f455ac0265d9f2477300054f504f563b0c58.zip
busybox-a3e4f455ac0265d9f2477300054f504f563b0c58.tar.gz
Fix a problem with unsatisfied backrefs (noted by Martin Bene).
-rw-r--r--editors/sed.c10
-rw-r--r--sed.c10
2 files changed, 12 insertions, 8 deletions
diff --git a/editors/sed.c b/editors/sed.c
index a18cfc7..352c5c9 100644
--- a/editors/sed.c
+++ b/editors/sed.c
@@ -490,7 +490,7 @@ static void load_cmd_file(char *filename)
}
}
-static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch)
+static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch, int matches)
{
int i;
@@ -506,8 +506,9 @@ static void print_subst_w_backrefs(const char *line, const char *replace, regmat
tmpstr[1] = 0;
backref = atoi(tmpstr);
/* print out the text held in regmatch[backref] */
- for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
- fputc(line[j], stdout);
+ if (backref <= matches && regmatch[backref].rm_so != -1)
+ for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
+ fputc(line[j], stdout);
}
/* if we find a backslash escaped character, print the character */
@@ -555,7 +556,8 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
fputc(hackline[i], stdout);
/* then print the substitution string */
- print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch);
+ print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
+ sed_cmd->num_backrefs);
/* advance past the match */
hackline += regmatch[0].rm_eo;
diff --git a/sed.c b/sed.c
index a18cfc7..352c5c9 100644
--- a/sed.c
+++ b/sed.c
@@ -490,7 +490,7 @@ static void load_cmd_file(char *filename)
}
}
-static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch)
+static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch, int matches)
{
int i;
@@ -506,8 +506,9 @@ static void print_subst_w_backrefs(const char *line, const char *replace, regmat
tmpstr[1] = 0;
backref = atoi(tmpstr);
/* print out the text held in regmatch[backref] */
- for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
- fputc(line[j], stdout);
+ if (backref <= matches && regmatch[backref].rm_so != -1)
+ for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
+ fputc(line[j], stdout);
}
/* if we find a backslash escaped character, print the character */
@@ -555,7 +556,8 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
fputc(hackline[i], stdout);
/* then print the substitution string */
- print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch);
+ print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
+ sed_cmd->num_backrefs);
/* advance past the match */
hackline += regmatch[0].rm_eo;