Added support for (a)ppend, (i)nsert, and (c)hange commands to sed.
This commit is contained in:
Mark Whitley
parent
496e33feeb
commit
94074a980c
@ -24,8 +24,9 @@
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Supported features and commands in this version of sed:
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- comments ('#')
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- Address matching: num|/matchstr/[,num|/matchstr/|$]command
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- Commands: p, d, s/match/replace/[g]
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- address matching: num|/matchstr/[,num|/matchstr/|$]command
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- commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
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- edit commands: (a)ppend, (i)nsert, (c)hange
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(Note: Specifying an address (range) to match is *optional*; commands
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default to the whole pattern space if no specific address match was
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@ -73,6 +74,9 @@ struct sed_cmd {
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regex_t *sub_match; /* sed -e 's/sub_match/replace/' */
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char *replace; /* sed -e 's/sub_match/replace/' XXX: who will hold the \1 \2 \3s? */
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unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */
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/* edit command (a,i,c) speicific field */
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char *editline;
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};
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/* globals */
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@ -274,6 +278,59 @@ static void parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
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free(match);
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}
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static void parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr)
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{
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int idx = 0;
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char *ptr; /* shorthand */
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/*
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* the string that gets passed to this function should look like this:
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*
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* need one of these
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* |
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* | this backslash (immediately following the edit command) is mandatory
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* | |
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* [aic]\
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* TEXT1\
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* TEXT2\
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* TEXTN
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*
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* as soon as we hit a TEXT line that has no trailing '\', we're done.
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* this means a command like:
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*
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* i\
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* INSERTME
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*
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* is a-ok.
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*
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*/
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if (editstr[1] != '\\' && (editstr[2] != '\n' || editstr[2] != '\r'))
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fatalError("bad format in edit expression\n");
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/* store the edit line text */
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sed_cmd->editline = strdup(&editstr[3]);
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ptr = sed_cmd->editline;
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/* now we need to go through * and: s/\\[\r\n]$/\n/g on the edit line */
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while (ptr[idx]) {
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while (ptr[idx] != '\\' && (ptr[idx+1] != '\n' || ptr[idx+1] != '\r')) {
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idx++;
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if (!ptr[idx]) {
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ptr[idx] = '\n';
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ptr[idx+1] = 0;
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return;
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}
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}
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/* move the newline over the '\' before it (effectively eats the '\') */
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memmove(&ptr[idx], &ptr[idx+1], strlen(&ptr[idx+1]));
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ptr[strlen(ptr)-1] = 0;
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/* substitue \r for \n if needed */
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if (ptr[idx] == '\r')
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ptr[idx] = '\n';
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}
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}
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static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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{
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int idx = 0;
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@ -295,13 +352,17 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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/* last part (mandatory) will be a command */
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if (cmdstr[idx] == '\0')
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fatalError("missing command\n");
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if (!strchr("pds", cmdstr[idx])) /* <-- XXX add new commands here */
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if (!strchr("pdsaic", cmdstr[idx])) /* <-- XXX add new commands here */
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fatalError("invalid command\n");
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sed_cmd->cmd = cmdstr[idx];
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/* special-case handling for (s)ubstitution */
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if (sed_cmd->cmd == 's')
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parse_subst_cmd(sed_cmd, &cmdstr[idx]);
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/* special-case handling for (a)ppend, (i)nsert, and (c)hange */
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if (strchr("aic", cmdstr[idx]))
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parse_edit_cmd(sed_cmd, &cmdstr[idx]);
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}
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static void add_cmd_str(const char *cmdstr)
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@ -327,13 +388,19 @@ static void load_cmd_file(char *filename)
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{
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FILE *cmdfile;
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char *line;
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char *nextline;
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cmdfile = fopen(filename, "r");
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if (cmdfile == NULL)
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fatalError(strerror(errno));
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while ((line = get_line_from_file(cmdfile)) != NULL) {
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line[strlen(line)-1] = 0; /* eat newline */
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/* if a line ends with '\' it needs the next line appended to it */
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while (line[strlen(line)-2] == '\\' &&
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(nextline = get_line_from_file(cmdfile)) != NULL) {
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line = realloc(line, strlen(line) + strlen(nextline) + 1);
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strcat(line, nextline);
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}
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add_cmd_str(line);
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free(line);
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}
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@ -359,8 +426,7 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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fputs(sed_cmd->replace, stdout);
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/* then advance past the match */
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ptr += regmatch.rm_eo;
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/* and let the calling function know that something
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* has been changed */
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/* and flag that something has changed */
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altered++;
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/* if we're not doing this globally... */
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@ -398,6 +464,21 @@ static int do_sed_command(const struct sed_cmd *sed_cmd, const char *line)
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case 's':
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altered = do_subst_command(sed_cmd, line);
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break;
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case 'a':
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fputs(line, stdout);
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fputs(sed_cmd->editline, stdout);
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altered++;
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break;
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case 'i':
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fputs(sed_cmd->editline, stdout);
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break;
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case 'c':
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fputs(sed_cmd->editline, stdout);
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altered++;
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break;
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}
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return altered;
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@ -483,7 +564,7 @@ extern int sed_main(int argc, char **argv)
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while ((opt = getopt(argc, argv, "Vhne:f:")) > 0) {
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switch (opt) {
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case 'V':
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printf("Print Busybox version here\n");
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printf("BusyBox v%s (%s)\n", BB_VER, BB_BT);
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exit(0);
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break;
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case 'h':
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95
sed.c
95
sed.c
@ -24,8 +24,9 @@
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Supported features and commands in this version of sed:
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- comments ('#')
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- Address matching: num|/matchstr/[,num|/matchstr/|$]command
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- Commands: p, d, s/match/replace/[g]
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- address matching: num|/matchstr/[,num|/matchstr/|$]command
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- commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
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- edit commands: (a)ppend, (i)nsert, (c)hange
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(Note: Specifying an address (range) to match is *optional*; commands
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default to the whole pattern space if no specific address match was
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@ -73,6 +74,9 @@ struct sed_cmd {
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regex_t *sub_match; /* sed -e 's/sub_match/replace/' */
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char *replace; /* sed -e 's/sub_match/replace/' XXX: who will hold the \1 \2 \3s? */
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unsigned int sub_g:1; /* sed -e 's/foo/bar/g' (global) */
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/* edit command (a,i,c) speicific field */
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char *editline;
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};
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/* globals */
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@ -274,6 +278,59 @@ static void parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
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free(match);
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}
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static void parse_edit_cmd(struct sed_cmd *sed_cmd, const char *editstr)
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{
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int idx = 0;
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char *ptr; /* shorthand */
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/*
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* the string that gets passed to this function should look like this:
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*
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* need one of these
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* |
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* | this backslash (immediately following the edit command) is mandatory
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* | |
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* [aic]\
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* TEXT1\
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* TEXT2\
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* TEXTN
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*
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* as soon as we hit a TEXT line that has no trailing '\', we're done.
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* this means a command like:
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*
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* i\
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* INSERTME
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*
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* is a-ok.
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*
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*/
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if (editstr[1] != '\\' && (editstr[2] != '\n' || editstr[2] != '\r'))
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fatalError("bad format in edit expression\n");
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/* store the edit line text */
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sed_cmd->editline = strdup(&editstr[3]);
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ptr = sed_cmd->editline;
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/* now we need to go through * and: s/\\[\r\n]$/\n/g on the edit line */
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while (ptr[idx]) {
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while (ptr[idx] != '\\' && (ptr[idx+1] != '\n' || ptr[idx+1] != '\r')) {
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idx++;
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if (!ptr[idx]) {
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ptr[idx] = '\n';
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ptr[idx+1] = 0;
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return;
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}
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}
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/* move the newline over the '\' before it (effectively eats the '\') */
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memmove(&ptr[idx], &ptr[idx+1], strlen(&ptr[idx+1]));
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ptr[strlen(ptr)-1] = 0;
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/* substitue \r for \n if needed */
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if (ptr[idx] == '\r')
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ptr[idx] = '\n';
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}
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}
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static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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{
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int idx = 0;
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@ -295,13 +352,17 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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/* last part (mandatory) will be a command */
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if (cmdstr[idx] == '\0')
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fatalError("missing command\n");
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if (!strchr("pds", cmdstr[idx])) /* <-- XXX add new commands here */
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if (!strchr("pdsaic", cmdstr[idx])) /* <-- XXX add new commands here */
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fatalError("invalid command\n");
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sed_cmd->cmd = cmdstr[idx];
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/* special-case handling for (s)ubstitution */
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if (sed_cmd->cmd == 's')
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parse_subst_cmd(sed_cmd, &cmdstr[idx]);
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/* special-case handling for (a)ppend, (i)nsert, and (c)hange */
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if (strchr("aic", cmdstr[idx]))
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parse_edit_cmd(sed_cmd, &cmdstr[idx]);
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}
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static void add_cmd_str(const char *cmdstr)
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@ -327,13 +388,19 @@ static void load_cmd_file(char *filename)
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{
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FILE *cmdfile;
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char *line;
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char *nextline;
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cmdfile = fopen(filename, "r");
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if (cmdfile == NULL)
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fatalError(strerror(errno));
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while ((line = get_line_from_file(cmdfile)) != NULL) {
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line[strlen(line)-1] = 0; /* eat newline */
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/* if a line ends with '\' it needs the next line appended to it */
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while (line[strlen(line)-2] == '\\' &&
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(nextline = get_line_from_file(cmdfile)) != NULL) {
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line = realloc(line, strlen(line) + strlen(nextline) + 1);
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strcat(line, nextline);
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}
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add_cmd_str(line);
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free(line);
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}
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@ -359,8 +426,7 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
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fputs(sed_cmd->replace, stdout);
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/* then advance past the match */
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ptr += regmatch.rm_eo;
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/* and let the calling function know that something
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* has been changed */
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/* and flag that something has changed */
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altered++;
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/* if we're not doing this globally... */
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@ -398,6 +464,21 @@ static int do_sed_command(const struct sed_cmd *sed_cmd, const char *line)
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case 's':
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altered = do_subst_command(sed_cmd, line);
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break;
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case 'a':
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fputs(line, stdout);
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fputs(sed_cmd->editline, stdout);
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altered++;
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break;
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case 'i':
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fputs(sed_cmd->editline, stdout);
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break;
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case 'c':
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fputs(sed_cmd->editline, stdout);
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altered++;
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break;
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}
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return altered;
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@ -483,7 +564,7 @@ extern int sed_main(int argc, char **argv)
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while ((opt = getopt(argc, argv, "Vhne:f:")) > 0) {
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switch (opt) {
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case 'V':
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printf("Print Busybox version here\n");
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printf("BusyBox v%s (%s)\n", BB_VER, BB_BT);
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exit(0);
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break;
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case 'h':
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