A patch from Shu-Hao Chang <shuhao_chang@trend.com.tw> to
fixed sed handling of multiple -e commands
diff --git a/sed.c b/sed.c
index 352c5c9..4fe882d 100644
--- a/sed.c
+++ b/sed.c
@@ -490,8 +490,23 @@
}
}
-static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch, int matches)
+#define PIPE_MAGIC 0x7f
+#define PIPE_GROW 64
+#define pipeputc(c) \
+{ if (pipeline[pipeline_idx] == PIPE_MAGIC) { \
+ pipeline = xrealloc(pipeline, pipeline_len+PIPE_GROW); \
+ memset(pipeline+pipeline_len, 0, PIPE_GROW); \
+ pipeline_len += PIPE_GROW; \
+ pipeline[pipeline_len-1] = PIPE_MAGIC; } \
+ pipeline[pipeline_idx++] = (c); }
+
+static void print_subst_w_backrefs(const char *line, const char *replace,
+ regmatch_t *regmatch, char **pipeline_p, int *pipeline_idx_p,
+ int *pipeline_len_p, int matches)
{
+ char *pipeline = *pipeline_p;
+ int pipeline_idx = *pipeline_idx_p;
+ int pipeline_len = *pipeline_len_p;
int i;
/* go through the replacement string */
@@ -508,13 +523,13 @@
/* print out the text held in regmatch[backref] */
if (backref <= matches && regmatch[backref].rm_so != -1)
for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
- fputc(line[j], stdout);
+ pipeputc(line[j]);
}
/* if we find a backslash escaped character, print the character */
else if (replace[i] == '\\') {
++i;
- fputc(replace[i], stdout);
+ pipeputc(replace[i]);
}
/* if we find an unescaped '&' print out the whole matched text.
@@ -524,27 +539,41 @@
else if (replace[i] == '&' && replace[i-1] != '\\') {
int j;
for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++)
- fputc(line[j], stdout);
+ pipeputc(line[j]);
}
/* nothing special, just print this char of the replacement string to stdout */
else
- fputc(replace[i], stdout);
+ pipeputc(replace[i]);
}
+ *pipeline_p = pipeline;
+ *pipeline_idx_p = pipeline_idx;
+ *pipeline_len_p = pipeline_len;
}
-static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
+static int do_subst_command(const struct sed_cmd *sed_cmd, char **line)
{
- char *hackline = (char *)line;
+ char *hackline = *line;
+ char *pipeline = 0;
+ int pipeline_idx = 0;
+ int pipeline_len = 0;
int altered = 0;
regmatch_t *regmatch = NULL;
/* we only proceed if the substitution 'search' expression matches */
- if (regexec(sed_cmd->sub_match, line, 0, NULL, 0) == REG_NOMATCH)
+ if (regexec(sed_cmd->sub_match, hackline, 0, NULL, 0) == REG_NOMATCH)
return 0;
/* whaddaya know, it matched. get the number of back references */
regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1));
+ /* allocate more PIPE_GROW bytes
+ if replaced string is larger than original */
+ pipeline_len = strlen(hackline)+PIPE_GROW;
+ pipeline = xmalloc(pipeline_len);
+ memset(pipeline, 0, pipeline_len);
+ /* buffer magic */
+ pipeline[pipeline_len-1] = PIPE_MAGIC;
+
/* and now, as long as we've got a line to try matching and if we can match
* the search string, we make substitutions */
while (*hackline && (regexec(sed_cmd->sub_match, hackline,
@@ -553,10 +582,11 @@
/* print everything before the match */
for (i = 0; i < regmatch[0].rm_so; i++)
- fputc(hackline[i], stdout);
+ pipeputc(hackline[i]);
/* then print the substitution string */
- print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
+ print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
+ &pipeline, &pipeline_idx, &pipeline_len,
sed_cmd->num_backrefs);
/* advance past the match */
@@ -569,11 +599,14 @@
break;
}
- puts(hackline);
+ for (; *hackline; hackline++) pipeputc(*hackline);
+ if (pipeline[pipeline_idx] == PIPE_MAGIC) pipeline[pipeline_idx] = 0;
/* cleanup */
free(regmatch);
+ free(*line);
+ *line = pipeline;
return altered;
}
@@ -652,12 +685,14 @@
/* we print the line once, unless we were told to be quiet */
if (!be_quiet)
- altered |= do_subst_command(&sed_cmds[i], line);
+ altered |= do_subst_command(&sed_cmds[i], &line);
/* we also print the line if we were given the 'p' flag
* (this is quite possibly the second printing) */
if (sed_cmds[i].sub_p)
- altered |= do_subst_command(&sed_cmds[i], line);
+ altered |= do_subst_command(&sed_cmds[i], &line);
+ if (altered && (i+1 >= ncmds || sed_cmds[i+1].cmd != 's'))
+ puts(line);
break;