diff options
| -rw-r--r-- | editors/sed.c | 81 | ||||
| -rw-r--r-- | sed.c | 81 |
2 files changed, 36 insertions, 126 deletions
diff --git a/editors/sed.c b/editors/sed.c index 341924d6b..7fb906a15 100644 --- a/editors/sed.c +++ b/editors/sed.c @@ -36,11 +36,9 @@ Unsupported features: - transliteration (y/source-chars/dest-chars/) (use 'tr') - - no support for characters other than the '/' character for regex matches - no pattern space hold space storing / swapping (x, etc.) - no labels / branching (: label, b, t, and friends) - and lots, lots more. - */ #include <stdio.h> @@ -63,6 +61,7 @@ struct sed_cmd { /* GENERAL FIELDS */ + char delimiter; /* The delimiter used to separate regexps */ /* address storage */ int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */ @@ -128,64 +127,17 @@ static void destroy_cmd_strs() } #endif -#if 0 -/* - * trim_str - trims leading and trailing space from a string - * - * Note: This returns a malloc'ed string so you must store and free it - * XXX: This should be in the utility.c file. - * XXX: This is now obsolete. Maybe it belongs nowhere. - */ -static char *trim_str(const char *str) -{ - int i; - char *retstr = strdup(str); - - /* trim leading whitespace */ - memmove(retstr, &retstr[strspn(retstr, " \n\t\v")], strlen(retstr)); - - /* trim trailing whitespace */ - i = strlen(retstr) - 1; - while (isspace(retstr[i])) - i--; - retstr[++i] = 0; - - /* Aside: - * - * you know, a strrspn() would really be nice cuz then we could say: - * - * retstr[strrspn(retstr, " \n\t\v") + 1] = 0; - */ - - return retstr; -} -#endif - -#if 0 -/* - * strrspn - works just like strspn() but goes from right to left instead of - * left to right - */ -static size_t strrspn(const char *s, const char *accept) -{ - size_t i = strlen(s); - - while (strchr(accept, s[--i])) - ; - - return i; -} -#endif /* - * index_of_next_unescaped_slash - walks left to right through a string - * beginning at a specified index and returns the index of the next forward - * slash ('/') not preceeded by a backslash ('\'). + * index_of_next_unescaped_regexp_delim - walks left to right through a string + * beginning at a specified index and returns the index of the next regular + * expression delimiter (typically a forward * slash ('/')) not preceeded by + * a backslash ('\'). */ -static int index_of_next_unescaped_slash(const char *str, int idx) +static int index_of_next_unescaped_regexp_delim(struct sed_cmd *sed_cmd, const char *str, int idx) { for ( ; str[idx]; idx++) { - if (str[idx] == '/' && str[idx-1] != '\\') + if (str[idx] == sed_cmd->delimiter && str[idx-1] != '\\') return idx; } @@ -196,7 +148,7 @@ static int index_of_next_unescaped_slash(const char *str, int idx) /* * returns the index in the string just past where the address ends. */ -static int get_address(const char *str, int *line, regex_t **regex) +static int get_address(struct sed_cmd *sed_cmd, const char *str, int *line, regex_t **regex) { char *my_str = strdup(str); int idx = 0; @@ -213,7 +165,7 @@ static int get_address(const char *str, int *line, regex_t **regex) idx++; } else if (my_str[idx] == '/') { - idx = index_of_next_unescaped_slash(my_str, ++idx); + idx = index_of_next_unescaped_regexp_delim(sed_cmd, my_str, ++idx); if (idx == -1) error_msg_and_die("unterminated match expression\n"); my_str[idx] = '\0'; @@ -256,13 +208,16 @@ static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr) * (all three of the '/' slashes are mandatory) */ - /* verify that the 's' is followed by a 'slash' */ - if (substr[++idx] != '/') + /* verify that the 's' is followed by something. That something + * (typically a 'slash') is now our regexp delimiter... */ + if (!substr[++idx]) error_msg_and_die("bad format in substitution expression\n"); + else + sed_cmd->delimiter=substr[idx]; /* save the match string */ oldidx = idx+1; - idx = index_of_next_unescaped_slash(substr, ++idx); + idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); if (idx == -1) error_msg_and_die("bad format in substitution expression\n"); match = strdup_substr(substr, oldidx, idx); @@ -281,7 +236,7 @@ static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr) /* save the replacement string */ oldidx = idx+1; - idx = index_of_next_unescaped_slash(substr, ++idx); + idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); if (idx == -1) error_msg_and_die("bad format in substitution expression\n"); sed_cmd->replace = strdup_substr(substr, oldidx, idx); @@ -401,11 +356,11 @@ static char *parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) /* first part (if present) is an address: either a number or a /regex/ */ if (isdigit(cmdstr[idx]) || cmdstr[idx] == '/') - idx = get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); + idx = get_address(sed_cmd, cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); /* second part (if present) will begin with a comma */ if (cmdstr[idx] == ',') - idx += get_address(&cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match); + idx += get_address(sed_cmd, &cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match); /* last part (mandatory) will be a command */ if (cmdstr[idx] == '\0') @@ -36,11 +36,9 @@ Unsupported features: - transliteration (y/source-chars/dest-chars/) (use 'tr') - - no support for characters other than the '/' character for regex matches - no pattern space hold space storing / swapping (x, etc.) - no labels / branching (: label, b, t, and friends) - and lots, lots more. - */ #include <stdio.h> @@ -63,6 +61,7 @@ struct sed_cmd { /* GENERAL FIELDS */ + char delimiter; /* The delimiter used to separate regexps */ /* address storage */ int beg_line; /* 'sed 1p' 0 == no begining line, apply commands to all lines */ @@ -128,64 +127,17 @@ static void destroy_cmd_strs() } #endif -#if 0 -/* - * trim_str - trims leading and trailing space from a string - * - * Note: This returns a malloc'ed string so you must store and free it - * XXX: This should be in the utility.c file. - * XXX: This is now obsolete. Maybe it belongs nowhere. - */ -static char *trim_str(const char *str) -{ - int i; - char *retstr = strdup(str); - - /* trim leading whitespace */ - memmove(retstr, &retstr[strspn(retstr, " \n\t\v")], strlen(retstr)); - - /* trim trailing whitespace */ - i = strlen(retstr) - 1; - while (isspace(retstr[i])) - i--; - retstr[++i] = 0; - - /* Aside: - * - * you know, a strrspn() would really be nice cuz then we could say: - * - * retstr[strrspn(retstr, " \n\t\v") + 1] = 0; - */ - - return retstr; -} -#endif - -#if 0 -/* - * strrspn - works just like strspn() but goes from right to left instead of - * left to right - */ -static size_t strrspn(const char *s, const char *accept) -{ - size_t i = strlen(s); - - while (strchr(accept, s[--i])) - ; - - return i; -} -#endif /* - * index_of_next_unescaped_slash - walks left to right through a string - * beginning at a specified index and returns the index of the next forward - * slash ('/') not preceeded by a backslash ('\'). + * index_of_next_unescaped_regexp_delim - walks left to right through a string + * beginning at a specified index and returns the index of the next regular + * expression delimiter (typically a forward * slash ('/')) not preceeded by + * a backslash ('\'). */ -static int index_of_next_unescaped_slash(const char *str, int idx) +static int index_of_next_unescaped_regexp_delim(struct sed_cmd *sed_cmd, const char *str, int idx) { for ( ; str[idx]; idx++) { - if (str[idx] == '/' && str[idx-1] != '\\') + if (str[idx] == sed_cmd->delimiter && str[idx-1] != '\\') return idx; } @@ -196,7 +148,7 @@ static int index_of_next_unescaped_slash(const char *str, int idx) /* * returns the index in the string just past where the address ends. */ -static int get_address(const char *str, int *line, regex_t **regex) +static int get_address(struct sed_cmd *sed_cmd, const char *str, int *line, regex_t **regex) { char *my_str = strdup(str); int idx = 0; @@ -213,7 +165,7 @@ static int get_address(const char *str, int *line, regex_t **regex) idx++; } else if (my_str[idx] == '/') { - idx = index_of_next_unescaped_slash(my_str, ++idx); + idx = index_of_next_unescaped_regexp_delim(sed_cmd, my_str, ++idx); if (idx == -1) error_msg_and_die("unterminated match expression\n"); my_str[idx] = '\0'; @@ -256,13 +208,16 @@ static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr) * (all three of the '/' slashes are mandatory) */ - /* verify that the 's' is followed by a 'slash' */ - if (substr[++idx] != '/') + /* verify that the 's' is followed by something. That something + * (typically a 'slash') is now our regexp delimiter... */ + if (!substr[++idx]) error_msg_and_die("bad format in substitution expression\n"); + else + sed_cmd->delimiter=substr[idx]; /* save the match string */ oldidx = idx+1; - idx = index_of_next_unescaped_slash(substr, ++idx); + idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); if (idx == -1) error_msg_and_die("bad format in substitution expression\n"); match = strdup_substr(substr, oldidx, idx); @@ -281,7 +236,7 @@ static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr) /* save the replacement string */ oldidx = idx+1; - idx = index_of_next_unescaped_slash(substr, ++idx); + idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx); if (idx == -1) error_msg_and_die("bad format in substitution expression\n"); sed_cmd->replace = strdup_substr(substr, oldidx, idx); @@ -401,11 +356,11 @@ static char *parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr) /* first part (if present) is an address: either a number or a /regex/ */ if (isdigit(cmdstr[idx]) || cmdstr[idx] == '/') - idx = get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); + idx = get_address(sed_cmd, cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match); /* second part (if present) will begin with a comma */ if (cmdstr[idx] == ',') - idx += get_address(&cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match); + idx += get_address(sed_cmd, &cmdstr[++idx], &sed_cmd->end_line, &sed_cmd->end_match); /* last part (mandatory) will be a command */ if (cmdstr[idx] == '\0') |