diff options
Diffstat (limited to 'editors/sed.c')
| -rw-r--r-- | editors/sed.c | 95 |
1 files changed, 88 insertions, 7 deletions
diff --git a/editors/sed.c b/editors/sed.c index bf8ca1b..1eea128 100644 --- a/editors/sed.c +++ b/editors/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 @@ struct sed_cmd { 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 @@ static void parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr) 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 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) /* 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 @@ static void load_cmd_file(char *filename) { 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 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line) 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 @@ static int do_sed_command(const struct sed_cmd *sed_cmd, const char *line) 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 @@ extern int sed_main(int argc, char **argv) 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': |