- /* are we acting on a range of matched lines? */
- if (sed_cmds[i].beg_match && sed_cmds[i].end_match) {
- if (still_in_range || regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0) {
- line_altered += do_sed_command(&sed_cmds[i], line);
- if (still_in_range && regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0)
- still_in_range = 0;
- else
- still_in_range = 1;
+ /*
+ * entry point into sedding...
+ */
+ int matched = (
+ /* no range necessary */
+ (sed_cmd->beg_line == 0 && sed_cmd->end_line == 0 &&
+ sed_cmd->beg_match == NULL &&
+ sed_cmd->end_match == NULL) ||
+ /* this line number is the first address we're looking for */
+ (sed_cmd->beg_line && (sed_cmd->beg_line == linenum)) ||
+ /* this line matches our first address regex */
+ (sed_cmd->beg_match && (regexec(sed_cmd->beg_match, line, 0, NULL, 0) == 0)) ||
+ /* we are currently within the beginning & ending address range */
+ still_in_range
+ );
+
+ if (sed_cmd->invert ^ matched) {
+
+ /*
+ * actual sedding
+ */
+ switch (sed_cmd->cmd) {
+
+ case 'p':
+ puts(line);
+ break;
+
+ case 'd':
+ altered++;
+ deleted = 1;
+ break;
+
+ case 's':
+
+ /*
+ * Some special cases for 's' printing to make it compliant with
+ * GNU sed printing behavior (aka "The -n | s///p Matrix"):
+ *
+ * -n ONLY = never print anything regardless of any successful
+ * substitution
+ *
+ * s///p ONLY = always print successful substitutions, even if
+ * the line is going to be printed anyway (line will be printed
+ * twice).
+ *
+ * -n AND s///p = print ONLY a successful substitution ONE TIME;
+ * no other lines are printed - this is the reason why the 'p'
+ * flag exists in the first place.
+ */
+
+ /* if the user specified that they didn't want anything printed (i.e., a -n
+ * flag and no 'p' flag after the s///), then there's really no point doing
+ * anything here. */
+ if (be_quiet && !sed_cmd->sub_p)
+ break;
+
+ /* we print the line once, unless we were told to be quiet */
+ if (!be_quiet)
+ altered |= do_subst_command(sed_cmd, &line);
+
+ /* we also print the line if we were given the 'p' flag
+ * (this is quite possibly the second printing) */
+ if (sed_cmd->sub_p)
+ altered |= do_subst_command(sed_cmd, &line);
+ if (altered && (i+1 >= ncmds || sed_cmds[i+1].cmd != 's'))
+ puts(line);
+
+ break;
+
+ case 'a':
+ puts(line);
+ fputs(sed_cmd->editline, stdout);
+ altered++;
+ break;
+
+ case 'i':
+ fputs(sed_cmd->editline, stdout);
+ break;
+
+ case 'c':
+ /* single-address case */
+ if ((sed_cmd->end_match == NULL && sed_cmd->end_line == 0)
+ /* multi-address case */
+ /* - matching text */
+ || (sed_cmd->end_match && (regexec(sed_cmd->end_match, line, 0, NULL, 0) == 0))
+ /* - matching line numbers */
+ || (sed_cmd->end_line > 0 && sed_cmd->end_line == linenum))
+ {
+ fputs(sed_cmd->editline, stdout);
+ }
+ altered++;
+
+ break;
+
+ case 'r': {
+ FILE *outfile;
+ puts(line);
+ outfile = fopen(sed_cmd->filename, "r");
+ if (outfile)
+ print_file(outfile);
+ /* else if we couldn't open the output file,
+ * no biggie, just don't print anything */
+ altered++;
+ }
+ break;