Added support for (a)ppend, (i)nsert, and (c)hange commands to sed.
diff --git a/sed.c b/sed.c
index bf8ca1b..1eea128 100644
--- a/sed.c
+++ b/sed.c
@@ -24,8 +24,9 @@
Supported features and commands in this version of sed:
- comments ('#')
- - Address matching: num|/matchstr/[,num|/matchstr/|$]command
- - Commands: p, d, s/match/replace/[g]
+ - address matching: num|/matchstr/[,num|/matchstr/|$]command
+ - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
+ - edit commands: (a)ppend, (i)nsert, (c)hange
(Note: Specifying an address (range) to match is *optional*; commands
default to the whole pattern space if no specific address match was
@@ -73,6 +74,9 @@
regex_t *sub_match; /* sed -e 's/sub_match/replace/' */
char *replace; /* sed -e 's/sub_match/replace/' XXX: who will hold the \1 \2 \3s? */
unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */
+
+ /* edit command (a,i,c) speicific field */
+ char *editline;
};
/* globals */
@@ -274,6 +278,59 @@
free(match);
}
+static void parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr)
+{
+ int idx = 0;
+ char *ptr; /* shorthand */
+
+ /*
+ * the string that gets passed to this function should look like this:
+ *
+ * need one of these
+ * |
+ * | this backslash (immediately following the edit command) is mandatory
+ * | |
+ * [aic]\
+ * TEXT1\
+ * TEXT2\
+ * TEXTN
+ *
+ * as soon as we hit a TEXT line that has no trailing '\', we're done.
+ * this means a command like:
+ *
+ * i\
+ * INSERTME
+ *
+ * is a-ok.
+ *
+ */
+
+ if (editstr[1] != '\\' && (editstr[2] != '\n' || editstr[2] != '\r'))
+ fatalError("bad format in edit expression\n");
+
+ /* store the edit line text */
+ sed_cmd->editline = strdup(&editstr[3]);
+ ptr = sed_cmd->editline;
+
+ /* now we need to go through * and: s/\\[\r\n]$/\n/g on the edit line */
+ while (ptr[idx]) {
+ while (ptr[idx] != '\\' && (ptr[idx+1] != '\n' || ptr[idx+1] != '\r')) {
+ idx++;
+ if (!ptr[idx]) {
+ ptr[idx] = '\n';
+ ptr[idx+1] = 0;
+ return;
+ }
+ }
+ /* move the newline over the '\' before it (effectively eats the '\') */
+ memmove(&ptr[idx], &ptr[idx+1], strlen(&ptr[idx+1]));
+ ptr[strlen(ptr)-1] = 0;
+ /* substitue \r for \n if needed */
+ if (ptr[idx] == '\r')
+ ptr[idx] = '\n';
+ }
+}
+
static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
{
int idx = 0;
@@ -295,13 +352,17 @@
/* last part (mandatory) will be a command */
if (cmdstr[idx] == '\0')
fatalError("missing command\n");
- if (!strchr("pds", cmdstr[idx])) /* <-- XXX add new commands here */
+ if (!strchr("pdsaic", cmdstr[idx])) /* <-- XXX add new commands here */
fatalError("invalid command\n");
sed_cmd->cmd = cmdstr[idx];
/* special-case handling for (s)ubstitution */
if (sed_cmd->cmd == 's')
parse_subst_cmd(sed_cmd, &cmdstr[idx]);
+
+ /* special-case handling for (a)ppend, (i)nsert, and (c)hange */
+ if (strchr("aic", cmdstr[idx]))
+ parse_edit_cmd(sed_cmd, &cmdstr[idx]);
}
static void add_cmd_str(const char *cmdstr)
@@ -327,13 +388,19 @@
{
FILE *cmdfile;
char *line;
+ char *nextline;
cmdfile = fopen(filename, "r");
if (cmdfile == NULL)
fatalError(strerror(errno));
while ((line = get_line_from_file(cmdfile)) != NULL) {
- line[strlen(line)-1] = 0; /* eat newline */
+ /* if a line ends with '\' it needs the next line appended to it */
+ while (line[strlen(line)-2] == '\\' &&
+ (nextline = get_line_from_file(cmdfile)) != NULL) {
+ line = realloc(line, strlen(line) + strlen(nextline) + 1);
+ strcat(line, nextline);
+ }
add_cmd_str(line);
free(line);
}
@@ -359,8 +426,7 @@
fputs(sed_cmd->replace, stdout);
/* then advance past the match */
ptr += regmatch.rm_eo;
- /* and let the calling function know that something
- * has been changed */
+ /* and flag that something has changed */
altered++;
/* if we're not doing this globally... */
@@ -398,6 +464,21 @@
case 's':
altered = do_subst_command(sed_cmd, line);
break;
+
+ case 'a':
+ fputs(line, stdout);
+ fputs(sed_cmd->editline, stdout);
+ altered++;
+ break;
+
+ case 'i':
+ fputs(sed_cmd->editline, stdout);
+ break;
+
+ case 'c':
+ fputs(sed_cmd->editline, stdout);
+ altered++;
+ break;
}
return altered;
@@ -483,7 +564,7 @@
while ((opt = getopt(argc, argv, "Vhne:f:")) > 0) {
switch (opt) {
case 'V':
- printf("Print Busybox version here\n");
+ printf("BusyBox v%s (%s)\n", BB_VER, BB_BT);
exit(0);
break;
case 'h':