Minor code reorg: Changed the interface to index_of_next_unescaped_slash to an
interface that seems a little more sensible to me. Also broke out s/// expression parsing into it's own subroutine.
This commit is contained in:
Mark Whitley
parent
156959ea93
commit
06f3529ada
106
editors/sed.c
106
editors/sed.c
@ -162,7 +162,7 @@ static char *trim_str(const char *str)
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* index_of_unescaped_slash - walks left to right through a string beginning
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* at a specified index and returns the index of the next unescaped slash.
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*/
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static int index_of_next_unescaped_slash(int idx, const char *str)
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static int index_of_next_unescaped_slash(const char *str, int idx)
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{
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do {
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idx++;
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@ -196,7 +196,7 @@ static int get_address(const char *str, int *line, regex_t **regex)
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idx++;
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}
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else if (my_str[idx] == '/') {
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idx = index_of_next_unescaped_slash(idx, my_str);
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idx = index_of_next_unescaped_slash(my_str, idx);
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if (idx == -1)
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fatalError("unterminated match expression\n");
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my_str[idx] = '\0';
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@ -222,6 +222,59 @@ static char *strdup_substr(const char *str, int start, int end)
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return newstr;
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}
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static void parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
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{
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int oldidx, cflags = REG_NEWLINE;
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char *match;
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int idx = 0;
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/*
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* the string that gets passed to this function should look like this:
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* s/match/replace/gI
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* || | ||
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* mandatory optional
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*
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* (all three of the '/' slashes are mandatory)
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*/
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/* verify that the 's' is followed by a 'slash' */
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if (substr[++idx] != '/')
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fatalError("bad format in substitution expression\n");
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/* save the match string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(substr, idx);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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match = strdup_substr(substr, oldidx, idx);
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/* save the replacement string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(substr, idx);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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sed_cmd->replace = strdup_substr(substr, oldidx, idx);
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/* process the flags */
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while (substr[++idx]) {
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switch (substr[idx]) {
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case 'g':
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sed_cmd->sub_g = 1;
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break;
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case 'I':
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cflags |= REG_ICASE;
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break;
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default:
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fatalError("bad option in substitution expression\n");
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}
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}
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/* compile the regex */
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sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t));
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xregcomp(sed_cmd->sub_match, match, cflags);
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free(match);
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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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@ -246,53 +299,10 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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if (!strchr("pds", 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' */
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if (sed_cmd->cmd == 's') {
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int oldidx, cflags = REG_NEWLINE;
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char *match;
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/* format for substitution is:
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* s/match/replace/gI
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* | ||
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* mandatory optional
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*/
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/* verify that we have an 's' followed by a 'slash' */
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if (cmdstr[++idx] != '/')
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fatalError("bad format in substitution expression\n");
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/* save the match string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(idx, cmdstr);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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match = strdup_substr(cmdstr, oldidx, idx);
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/* save the replacement string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(idx, cmdstr);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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sed_cmd->replace = strdup_substr(cmdstr, oldidx, idx);
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/* process the flags */
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while (cmdstr[++idx]) {
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switch (cmdstr[idx]) {
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case 'g':
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sed_cmd->sub_g = 1;
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break;
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case 'I':
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cflags |= REG_ICASE;
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break;
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default:
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fatalError("bad option in substitution expression\n");
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}
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}
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/* compile the regex */
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sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t));
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xregcomp(sed_cmd->sub_match, match, cflags);
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free(match);
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}
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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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}
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static void add_cmd_str(const char *cmdstr)
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106
sed.c
106
sed.c
@ -162,7 +162,7 @@ static char *trim_str(const char *str)
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* index_of_unescaped_slash - walks left to right through a string beginning
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* at a specified index and returns the index of the next unescaped slash.
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*/
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static int index_of_next_unescaped_slash(int idx, const char *str)
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static int index_of_next_unescaped_slash(const char *str, int idx)
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{
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do {
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idx++;
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@ -196,7 +196,7 @@ static int get_address(const char *str, int *line, regex_t **regex)
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idx++;
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}
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else if (my_str[idx] == '/') {
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idx = index_of_next_unescaped_slash(idx, my_str);
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idx = index_of_next_unescaped_slash(my_str, idx);
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if (idx == -1)
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fatalError("unterminated match expression\n");
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my_str[idx] = '\0';
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@ -222,6 +222,59 @@ static char *strdup_substr(const char *str, int start, int end)
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return newstr;
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}
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static void parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
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{
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int oldidx, cflags = REG_NEWLINE;
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char *match;
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int idx = 0;
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/*
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* the string that gets passed to this function should look like this:
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* s/match/replace/gI
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* || | ||
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* mandatory optional
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*
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* (all three of the '/' slashes are mandatory)
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*/
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/* verify that the 's' is followed by a 'slash' */
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if (substr[++idx] != '/')
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fatalError("bad format in substitution expression\n");
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/* save the match string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(substr, idx);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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match = strdup_substr(substr, oldidx, idx);
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/* save the replacement string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(substr, idx);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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sed_cmd->replace = strdup_substr(substr, oldidx, idx);
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/* process the flags */
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while (substr[++idx]) {
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switch (substr[idx]) {
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case 'g':
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sed_cmd->sub_g = 1;
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break;
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case 'I':
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cflags |= REG_ICASE;
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break;
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default:
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fatalError("bad option in substitution expression\n");
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}
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}
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/* compile the regex */
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sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t));
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xregcomp(sed_cmd->sub_match, match, cflags);
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free(match);
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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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@ -246,53 +299,10 @@ static void parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
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if (!strchr("pds", 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' */
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if (sed_cmd->cmd == 's') {
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int oldidx, cflags = REG_NEWLINE;
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char *match;
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/* format for substitution is:
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* s/match/replace/gI
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* | ||
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* mandatory optional
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*/
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/* verify that we have an 's' followed by a 'slash' */
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if (cmdstr[++idx] != '/')
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fatalError("bad format in substitution expression\n");
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/* save the match string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(idx, cmdstr);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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match = strdup_substr(cmdstr, oldidx, idx);
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/* save the replacement string */
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oldidx = idx+1;
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idx = index_of_next_unescaped_slash(idx, cmdstr);
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if (idx == -1)
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fatalError("bad format in substitution expression\n");
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sed_cmd->replace = strdup_substr(cmdstr, oldidx, idx);
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/* process the flags */
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while (cmdstr[++idx]) {
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switch (cmdstr[idx]) {
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case 'g':
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sed_cmd->sub_g = 1;
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break;
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case 'I':
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cflags |= REG_ICASE;
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break;
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default:
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fatalError("bad option in substitution expression\n");
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}
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}
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/* compile the regex */
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sed_cmd->sub_match = (regex_t *)xmalloc(sizeof(regex_t));
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xregcomp(sed_cmd->sub_match, match, cflags);
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free(match);
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}
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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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}
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static void add_cmd_str(const char *cmdstr)
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