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https://git.busybox.net/busybox.git
synced 2024-11-24 06:03:27 +08:00
A patch from Shu-Hao Chang <shuhao_chang@trend.com.tw> to
fixed sed handling of multiple -e commands
This commit is contained in:
Eric Andersen
parent
1071ccfd25
commit
b76cb68979
@ -13,6 +13,8 @@
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* Rodney Brown <RDBrown@mira.net>
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-- Optimized gzip.c, shrinking it be ~1.5k
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* Shu-Hao Chang <shuhao_chang@trend.com.tw>
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-- Fixed sed handling of multiple -e commands
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-Erik Andersen, --not yet released--
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@ -490,8 +490,23 @@ static void load_cmd_file(char *filename)
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}
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}
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static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch, int matches)
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#define PIPE_MAGIC 0x7f
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#define PIPE_GROW 64
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#define pipeputc(c) \
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{ if (pipeline[pipeline_idx] == PIPE_MAGIC) { \
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pipeline = xrealloc(pipeline, pipeline_len+PIPE_GROW); \
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memset(pipeline+pipeline_len, 0, PIPE_GROW); \
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pipeline_len += PIPE_GROW; \
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pipeline[pipeline_len-1] = PIPE_MAGIC; } \
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pipeline[pipeline_idx++] = (c); }
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static void print_subst_w_backrefs(const char *line, const char *replace,
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regmatch_t *regmatch, char **pipeline_p, int *pipeline_idx_p,
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int *pipeline_len_p, int matches)
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{
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char *pipeline = *pipeline_p;
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int pipeline_idx = *pipeline_idx_p;
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int pipeline_len = *pipeline_len_p;
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int i;
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/* go through the replacement string */
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@ -508,13 +523,13 @@ static void print_subst_w_backrefs(const char *line, const char *replace, regmat
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/* print out the text held in regmatch[backref] */
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if (backref <= matches && regmatch[backref].rm_so != -1)
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for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
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fputc(line[j], stdout);
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pipeputc(line[j]);
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}
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/* if we find a backslash escaped character, print the character */
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else if (replace[i] == '\\') {
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++i;
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fputc(replace[i], stdout);
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pipeputc(replace[i]);
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}
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/* if we find an unescaped '&' print out the whole matched text.
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@ -524,27 +539,41 @@ static void print_subst_w_backrefs(const char *line, const char *replace, regmat
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else if (replace[i] == '&' && replace[i-1] != '\\') {
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int j;
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for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++)
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fputc(line[j], stdout);
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pipeputc(line[j]);
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}
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/* nothing special, just print this char of the replacement string to stdout */
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else
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fputc(replace[i], stdout);
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pipeputc(replace[i]);
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}
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*pipeline_p = pipeline;
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*pipeline_idx_p = pipeline_idx;
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*pipeline_len_p = pipeline_len;
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}
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static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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static int do_subst_command(const struct sed_cmd *sed_cmd, char **line)
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{
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char *hackline = (char *)line;
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char *hackline = *line;
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char *pipeline = 0;
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int pipeline_idx = 0;
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int pipeline_len = 0;
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int altered = 0;
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regmatch_t *regmatch = NULL;
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/* we only proceed if the substitution 'search' expression matches */
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if (regexec(sed_cmd->sub_match, line, 0, NULL, 0) == REG_NOMATCH)
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if (regexec(sed_cmd->sub_match, hackline, 0, NULL, 0) == REG_NOMATCH)
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return 0;
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/* whaddaya know, it matched. get the number of back references */
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regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1));
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/* allocate more PIPE_GROW bytes
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if replaced string is larger than original */
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pipeline_len = strlen(hackline)+PIPE_GROW;
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pipeline = xmalloc(pipeline_len);
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memset(pipeline, 0, pipeline_len);
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/* buffer magic */
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pipeline[pipeline_len-1] = PIPE_MAGIC;
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/* and now, as long as we've got a line to try matching and if we can match
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* the search string, we make substitutions */
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while (*hackline && (regexec(sed_cmd->sub_match, hackline,
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@ -553,10 +582,11 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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/* print everything before the match */
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for (i = 0; i < regmatch[0].rm_so; i++)
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fputc(hackline[i], stdout);
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pipeputc(hackline[i]);
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/* then print the substitution string */
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print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
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print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
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&pipeline, &pipeline_idx, &pipeline_len,
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sed_cmd->num_backrefs);
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/* advance past the match */
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@ -569,11 +599,14 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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break;
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}
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puts(hackline);
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for (; *hackline; hackline++) pipeputc(*hackline);
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if (pipeline[pipeline_idx] == PIPE_MAGIC) pipeline[pipeline_idx] = 0;
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/* cleanup */
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free(regmatch);
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free(*line);
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*line = pipeline;
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return altered;
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}
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@ -652,12 +685,14 @@ static void process_file(FILE *file)
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/* we print the line once, unless we were told to be quiet */
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if (!be_quiet)
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altered |= do_subst_command(&sed_cmds[i], line);
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altered |= do_subst_command(&sed_cmds[i], &line);
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/* we also print the line if we were given the 'p' flag
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* (this is quite possibly the second printing) */
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if (sed_cmds[i].sub_p)
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altered |= do_subst_command(&sed_cmds[i], line);
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altered |= do_subst_command(&sed_cmds[i], &line);
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if (altered && (i+1 >= ncmds || sed_cmds[i+1].cmd != 's'))
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puts(line);
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break;
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61
sed.c
61
sed.c
@ -490,8 +490,23 @@ static void load_cmd_file(char *filename)
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}
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}
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static void print_subst_w_backrefs(const char *line, const char *replace, regmatch_t *regmatch, int matches)
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#define PIPE_MAGIC 0x7f
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#define PIPE_GROW 64
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#define pipeputc(c) \
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{ if (pipeline[pipeline_idx] == PIPE_MAGIC) { \
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pipeline = xrealloc(pipeline, pipeline_len+PIPE_GROW); \
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memset(pipeline+pipeline_len, 0, PIPE_GROW); \
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pipeline_len += PIPE_GROW; \
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pipeline[pipeline_len-1] = PIPE_MAGIC; } \
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pipeline[pipeline_idx++] = (c); }
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static void print_subst_w_backrefs(const char *line, const char *replace,
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regmatch_t *regmatch, char **pipeline_p, int *pipeline_idx_p,
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int *pipeline_len_p, int matches)
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{
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char *pipeline = *pipeline_p;
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int pipeline_idx = *pipeline_idx_p;
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int pipeline_len = *pipeline_len_p;
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int i;
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/* go through the replacement string */
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@ -508,13 +523,13 @@ static void print_subst_w_backrefs(const char *line, const char *replace, regmat
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/* print out the text held in regmatch[backref] */
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if (backref <= matches && regmatch[backref].rm_so != -1)
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for (j = regmatch[backref].rm_so; j < regmatch[backref].rm_eo; j++)
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fputc(line[j], stdout);
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pipeputc(line[j]);
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}
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/* if we find a backslash escaped character, print the character */
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else if (replace[i] == '\\') {
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++i;
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fputc(replace[i], stdout);
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pipeputc(replace[i]);
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}
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/* if we find an unescaped '&' print out the whole matched text.
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@ -524,27 +539,41 @@ static void print_subst_w_backrefs(const char *line, const char *replace, regmat
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else if (replace[i] == '&' && replace[i-1] != '\\') {
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int j;
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for (j = regmatch[0].rm_so; j < regmatch[0].rm_eo; j++)
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fputc(line[j], stdout);
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pipeputc(line[j]);
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}
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/* nothing special, just print this char of the replacement string to stdout */
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else
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fputc(replace[i], stdout);
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pipeputc(replace[i]);
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}
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*pipeline_p = pipeline;
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*pipeline_idx_p = pipeline_idx;
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*pipeline_len_p = pipeline_len;
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}
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static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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static int do_subst_command(const struct sed_cmd *sed_cmd, char **line)
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{
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char *hackline = (char *)line;
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char *hackline = *line;
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char *pipeline = 0;
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int pipeline_idx = 0;
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int pipeline_len = 0;
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int altered = 0;
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regmatch_t *regmatch = NULL;
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/* we only proceed if the substitution 'search' expression matches */
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if (regexec(sed_cmd->sub_match, line, 0, NULL, 0) == REG_NOMATCH)
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if (regexec(sed_cmd->sub_match, hackline, 0, NULL, 0) == REG_NOMATCH)
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return 0;
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/* whaddaya know, it matched. get the number of back references */
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regmatch = xmalloc(sizeof(regmatch_t) * (sed_cmd->num_backrefs+1));
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/* allocate more PIPE_GROW bytes
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if replaced string is larger than original */
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pipeline_len = strlen(hackline)+PIPE_GROW;
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pipeline = xmalloc(pipeline_len);
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memset(pipeline, 0, pipeline_len);
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/* buffer magic */
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pipeline[pipeline_len-1] = PIPE_MAGIC;
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/* and now, as long as we've got a line to try matching and if we can match
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* the search string, we make substitutions */
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while (*hackline && (regexec(sed_cmd->sub_match, hackline,
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@ -553,10 +582,11 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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/* print everything before the match */
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for (i = 0; i < regmatch[0].rm_so; i++)
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fputc(hackline[i], stdout);
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pipeputc(hackline[i]);
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/* then print the substitution string */
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print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
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print_subst_w_backrefs(hackline, sed_cmd->replace, regmatch,
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&pipeline, &pipeline_idx, &pipeline_len,
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sed_cmd->num_backrefs);
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/* advance past the match */
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@ -569,11 +599,14 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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break;
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}
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puts(hackline);
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for (; *hackline; hackline++) pipeputc(*hackline);
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if (pipeline[pipeline_idx] == PIPE_MAGIC) pipeline[pipeline_idx] = 0;
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/* cleanup */
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free(regmatch);
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free(*line);
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*line = pipeline;
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return altered;
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}
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@ -652,12 +685,14 @@ static void process_file(FILE *file)
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/* we print the line once, unless we were told to be quiet */
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if (!be_quiet)
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altered |= do_subst_command(&sed_cmds[i], line);
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altered |= do_subst_command(&sed_cmds[i], &line);
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/* we also print the line if we were given the 'p' flag
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* (this is quite possibly the second printing) */
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if (sed_cmds[i].sub_p)
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altered |= do_subst_command(&sed_cmds[i], line);
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altered |= do_subst_command(&sed_cmds[i], &line);
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if (altered && (i+1 >= ncmds || sed_cmds[i+1].cmd != 's'))
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puts(line);
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break;
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