diff options
| -rw-r--r-- | editors/sed.c | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/editors/sed.c b/editors/sed.c index 5edcd48..93faf00 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -96,6 +96,9 @@ struct sed_cmd { /* the command */ char cmd; /* p,d,s (add more at your leisure :-) */ + + /* inversion flag */ + int invert; /* the '!' after the address */ }; /* globals */ @@ -405,6 +408,17 @@ static char *parse_cmd_str(struct sed_cmd * const sed_cmd, const char *const cmd while (isspace(cmdstr[idx])) idx++; + /* there my be the inversion flag between part2 and part3 */ + sed_cmd->invert = 0; + if (cmdstr[idx] == '!') { + sed_cmd->invert = 1; + idx++; + + /* skip whitespace before the command */ + while (isspace(cmdstr[idx])) + idx++; + } + /* last part (mandatory) will be a command */ if (cmdstr[idx] == '\0') error_msg_and_die("missing command"); @@ -642,12 +656,12 @@ static void process_file(FILE *file) /* for every line, go through all the commands */ for (i = 0; i < ncmds; i++) { struct sed_cmd *sed_cmd = &sed_cmds[i]; - + int deleted = 0; /* * entry point into sedding... */ - if ( + int matched = ( /* no range necessary */ (sed_cmd->beg_line == 0 && sed_cmd->end_line == 0 && sed_cmd->beg_match == NULL && @@ -658,8 +672,9 @@ static void process_file(FILE *file) (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 - ) { - int deleted = 0; + ); + + if (sed_cmd->invert ^ matched) { /* * actual sedding @@ -746,13 +761,15 @@ static void process_file(FILE *file) /* else if we couldn't open the output file, * no biggie, just don't print anything */ altered++; - } + } break; } + } - /* - * exit point from sedding... - */ + /* + * exit point from sedding... + */ + if (matched) { if ( /* this is a single-address command or... */ (sed_cmd->end_line == 0 && sed_cmd->end_match == NULL) || ( @@ -774,10 +791,10 @@ static void process_file(FILE *file) else { still_in_range = 1; } - - if (deleted) - break; } + + if (deleted) + break; } /* we will print the line unless we were told to be quiet or if the |