*
* MAINTAINER: Rob Landley <rob@landley.net>
*
- * Licensed under GPL version 2, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2, see file LICENSE in this source tree.
*/
/* Code overview.
+ *
+ * Files are laid out to avoid unnecessary function declarations. So for
+ * example, every function add_cmd calls occurs before add_cmd in this file.
+ *
+ * add_cmd() is called on each line of sed command text (from a file or from
+ * the command line). It calls get_address() and parse_cmd_args(). The
+ * resulting sed_cmd_t structures are appended to a linked list
+ * (G.sed_cmd_head/G.sed_cmd_tail).
+ *
+ * process_files() does actual sedding, reading data lines from each input FILE*
+ * (which could be stdin) and applying the sed command list (sed_cmd_head) to
+ * each of the resulting lines.
+ *
+ * sed_main() is where external code calls into this, with a command line.
+ */
- Files are laid out to avoid unnecessary function declarations. So for
- example, every function add_cmd calls occurs before add_cmd in this file.
-
- add_cmd() is called on each line of sed command text (from a file or from
- the command line). It calls get_address() and parse_cmd_args(). The
- resulting sed_cmd_t structures are appended to a linked list
- (G.sed_cmd_head/G.sed_cmd_tail).
-
- add_input_file() adds a FILE* to the list of input files. We need to
- know all input sources ahead of time to find the last line for the $ match.
-
- process_files() does actual sedding, reading data lines from each input FILE *
- (which could be stdin) and applying the sed command list (sed_cmd_head) to
- each of the resulting lines.
-
- sed_main() is where external code calls into this, with a command line.
-*/
-
-
-/*
- Supported features and commands in this version of sed:
+/* Supported features and commands in this version of sed:
+ *
+ * - comments ('#')
+ * - address matching: num|/matchstr/[,num|/matchstr/|$]command
+ * - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
+ * - edit commands: (a)ppend, (i)nsert, (c)hange
+ * - file commands: (r)ead
+ * - backreferences in substitution expressions (\0, \1, \2...\9)
+ * - grouped commands: {cmd1;cmd2}
+ * - transliteration (y/source-chars/dest-chars/)
+ * - pattern space hold space storing / swapping (g, h, x)
+ * - labels / branching (: label, b, t, T)
+ *
+ * (Note: Specifying an address (range) to match is *optional*; commands
+ * default to the whole pattern space if no specific address match was
+ * requested.)
+ *
+ * Todo:
+ * - Create a wrapper around regex to make libc's regex conform with sed
+ *
+ * Reference
+ * http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
+ * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
+ */
- - comments ('#')
- - address matching: num|/matchstr/[,num|/matchstr/|$]command
- - commands: (p)rint, (d)elete, (s)ubstitue (with g & I flags)
- - edit commands: (a)ppend, (i)nsert, (c)hange
- - file commands: (r)ead
- - backreferences in substitution expressions (\0, \1, \2...\9)
- - grouped commands: {cmd1;cmd2}
- - transliteration (y/source-chars/dest-chars/)
- - pattern space hold space storing / swapping (g, h, x)
- - labels / branching (: label, b, t, T)
+//config:config SED
+//config: bool "sed"
+//config: default y
+//config: help
+//config: sed is used to perform text transformations on a file
+//config: or input from a pipeline.
+
+//kbuild:lib-$(CONFIG_SED) += sed.o
+
+//applet:IF_SED(APPLET(sed, BB_DIR_BIN, BB_SUID_DROP))
+
+//usage:#define sed_trivial_usage
+//usage: "[-inrE] [-f FILE]... [-e CMD]... [FILE]...\n"
+//usage: "or: sed [-inrE] CMD [FILE]..."
+//usage:#define sed_full_usage "\n\n"
+//usage: " -e CMD Add CMD to sed commands to be executed"
+//usage: "\n -f FILE Add FILE contents to sed commands to be executed"
+//usage: "\n -i[SFX] Edit files in-place (otherwise sends to stdout)"
+//usage: "\n Optionally back files up, appending SFX"
+//usage: "\n -n Suppress automatic printing of pattern space"
+//usage: "\n -r,-E Use extended regex syntax"
+//usage: "\n"
+//usage: "\nIf no -e or -f, the first non-option argument is the sed command string."
+//usage: "\nRemaining arguments are input files (stdin if none)."
+//usage:
+//usage:#define sed_example_usage
+//usage: "$ echo \"foo\" | sed -e 's/f[a-zA-Z]o/bar/g'\n"
+//usage: "bar\n"
- (Note: Specifying an address (range) to match is *optional*; commands
- default to the whole pattern space if no specific address match was
- requested.)
+#include "libbb.h"
+#include "xregex.h"
- Todo:
- - Create a wrapper around regex to make libc's regex conform with sed
+#if 0
+# define dbg(...) bb_error_msg(__VA_ARGS__)
+#else
+# define dbg(...) ((void)0)
+#endif
- Reference http://www.opengroup.org/onlinepubs/007904975/utilities/sed.html
-*/
-#include "libbb.h"
-#include "xregex.h"
+enum {
+ OPT_in_place = 1 << 0,
+};
/* Each sed command turns into one of these structures. */
typedef struct sed_cmd_s {
regex_t *end_match; /* sed -e '/match/,/end_match/cmd' */
regex_t *sub_match; /* For 's/sub_match/string/' */
int beg_line; /* 'sed 1p' 0 == apply commands to all lines */
+ int beg_line_orig; /* copy of the above, needed for -i */
int end_line; /* 'sed 1,3p' 0 == one line only. -1 = last line ($) */
FILE *sw_file; /* File (sw) command writes to, -1 for none. */
struct globals {
/* options */
int be_quiet, regex_type;
+
FILE *nonstdout;
char *outname, *hold_space;
+ smallint exitcode;
- /* List of input files */
- int input_file_count, current_input_file;
- FILE **input_file_list;
+ /* list of input files */
+ int current_input_file, last_input_file;
+ char **input_file_list;
+ FILE *current_fp;
regmatch_t regmatch[10];
regex_t *previous_regex_ptr;
/* linked list of sed commands */
- sed_cmd_t sed_cmd_head, *sed_cmd_tail;
+ sed_cmd_t *sed_cmd_head, **sed_cmd_tail;
- /* Linked list of append lines */
+ /* linked list of append lines */
llist_t *append_head;
char *add_cmd_line;
struct pipeline {
- char *buf; /* Space to hold string */
- int idx; /* Space used */
- int len; /* Space allocated */
+ char *buf; /* Space to hold string */
+ int idx; /* Space used */
+ int len; /* Space allocated */
} pipeline;
-};
+} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
-void BUG_sed_globals_too_big(void);
+struct BUG_G_too_big {
+ char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
+};
#define INIT_G() do { \
- if (sizeof(struct globals) > COMMON_BUFSIZE) \
- BUG_sed_globals_too_big(); \
G.sed_cmd_tail = &G.sed_cmd_head; \
} while (0)
#if ENABLE_FEATURE_CLEAN_UP
static void sed_free_and_close_stuff(void)
{
- sed_cmd_t *sed_cmd = G.sed_cmd_head.next;
+ sed_cmd_t *sed_cmd = G.sed_cmd_head;
llist_free(G.append_head, free);
free(G.hold_space);
- while (G.current_input_file < G.input_file_count)
- fclose(G.input_file_list[G.current_input_file++]);
+ if (G.current_fp)
+ fclose(G.current_fp);
}
#else
void sed_free_and_close_stuff(void);
static char *copy_parsing_escapes(const char *string, int len)
{
+ const char *s;
char *dest = xmalloc(len + 1);
- parse_escapes(dest, string, len, 'n', '\n');
- /* GNU sed also recognizes \t */
- parse_escapes(dest, dest, strlen(dest), 't', '\t');
+ /* sed recognizes \n */
+ /* GNU sed also recognizes \t and \r */
+ for (s = "\nn\tt\rr"; *s; s += 2) {
+ parse_escapes(dest, string, len, s[1], s[0]);
+ string = dest;
+ len = strlen(dest);
+ }
return dest;
}
delimiter = -delimiter;
}
- for (; (ch = str[idx]); idx++) {
+ for (; (ch = str[idx]) != '\0'; idx++) {
if (bracket >= 0) {
- if (ch == ']' && !(bracket == idx - 1 || (bracket == idx - 2
- && str[idx - 1] == '^')))
+ if (ch == ']'
+ && !(bracket == idx - 1 || (bracket == idx - 2 && str[idx - 1] == '^'))
+ ) {
bracket = -1;
+ }
} else if (escaped)
escaped = 0;
else if (ch == '\\')
static int parse_regex_delim(const char *cmdstr, char **match, char **replace)
{
const char *cmdstr_ptr = cmdstr;
- char delimiter;
+ unsigned char delimiter;
int idx = 0;
/* verify that the 's' or 'y' is followed by something. That something
/* save the replacement string */
cmdstr_ptr += idx + 1;
- idx = index_of_next_unescaped_regexp_delim(-delimiter, cmdstr_ptr);
+ idx = index_of_next_unescaped_regexp_delim(- (int)delimiter, cmdstr_ptr);
*replace = copy_parsing_escapes(cmdstr_ptr, idx);
return ((cmdstr_ptr - cmdstr) + idx);
char *temp;
delimiter = '/';
- if (*my_str == '\\') delimiter = *++pos;
+ if (*my_str == '\\')
+ delimiter = *++pos;
next = index_of_next_unescaped_regexp_delim(delimiter, ++pos);
temp = copy_parsing_escapes(pos, next);
- *regex = xmalloc(sizeof(regex_t));
- xregcomp(*regex, temp, G.regex_type|REG_NEWLINE);
+ *regex = xzalloc(sizeof(regex_t));
+ xregcomp(*regex, temp, G.regex_type);
free(temp);
/* Move position to next character after last delimiter */
pos += (next+1);
/*
* A substitution command should look something like this:
- * s/match/replace/ #gIpw
+ * s/match/replace/ #giIpw
* || | |||
* mandatory optional
*/
break;
}
/* Ignore case (gnu exension) */
+ case 'i':
case 'I':
cflags |= REG_ICASE;
break;
/* Comment */
case '#':
- while (substr[++idx]) /*skip all*/;
+ // while (substr[++idx]) continue;
+ idx += strlen(substr + idx); // same
/* Fall through */
/* End of command */
case ';':
bb_error_msg_and_die("bad option in substitution expression");
}
}
-out:
+ out:
/* compile the match string into a regex */
if (*match != '\0') {
/* If match is empty, we use last regex used at runtime */
- sed_cmd->sub_match = xmalloc(sizeof(regex_t));
+ sed_cmd->sub_match = xzalloc(sizeof(regex_t));
+ dbg("xregcomp('%s',%x)", match, cflags);
xregcomp(sed_cmd->sub_match, match, cflags);
+ dbg("regcomp ok");
}
free(match);
*/
static const char *parse_cmd_args(sed_cmd_t *sed_cmd, const char *cmdstr)
{
+ static const char cmd_letters[] = "saicrw:btTydDgGhHlnNpPqx={}";
+ enum {
+ IDX_s = 0,
+ IDX_a,
+ IDX_i,
+ IDX_c,
+ IDX_r,
+ IDX_w,
+ IDX_colon,
+ IDX_b,
+ IDX_t,
+ IDX_T,
+ IDX_y,
+ IDX_d,
+ IDX_D,
+ IDX_g,
+ IDX_G,
+ IDX_h,
+ IDX_H,
+ IDX_l,
+ IDX_n,
+ IDX_N,
+ IDX_p,
+ IDX_P,
+ IDX_q,
+ IDX_x,
+ IDX_equal,
+ IDX_lbrace,
+ IDX_rbrace,
+ IDX_nul
+ };
+ struct chk { char chk[sizeof(cmd_letters)-1 == IDX_nul ? 1 : -1]; };
+
+ unsigned idx = strchrnul(cmd_letters, sed_cmd->cmd) - cmd_letters;
+
/* handle (s)ubstitution command */
- if (sed_cmd->cmd == 's')
+ if (idx == IDX_s) {
cmdstr += parse_subst_cmd(sed_cmd, cmdstr);
+ }
/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
- else if (strchr("aic", sed_cmd->cmd)) {
- if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
- bb_error_msg_and_die("only a beginning address can be specified for edit commands");
+ else if (idx <= IDX_c) { /* a,i,c */
+ if (idx < IDX_c) { /* a,i */
+ if (sed_cmd->end_line || sed_cmd->end_match)
+ bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
+ }
for (;;) {
if (*cmdstr == '\n' || *cmdstr == '\\') {
cmdstr++;
break;
- } else if (isspace(*cmdstr))
- cmdstr++;
- else
+ }
+ if (!isspace(*cmdstr))
break;
+ cmdstr++;
}
sed_cmd->string = xstrdup(cmdstr);
/* "\anychar" -> "anychar" */
parse_escapes(sed_cmd->string, sed_cmd->string, strlen(cmdstr), '\0', '\0');
cmdstr += strlen(cmdstr);
+ }
/* handle file cmds: (r)ead */
- } else if (strchr("rw", sed_cmd->cmd)) {
- if (sed_cmd->end_line || sed_cmd->end_match)
- bb_error_msg_and_die("command only uses one address");
+ else if (idx <= IDX_w) { /* r,w */
+ if (idx < IDX_w) { /* r */
+ if (sed_cmd->end_line || sed_cmd->end_match)
+ bb_error_msg_and_die("command '%c' uses only one address", sed_cmd->cmd);
+ }
cmdstr += parse_file_cmd(/*sed_cmd,*/ cmdstr, &sed_cmd->string);
if (sed_cmd->cmd == 'w') {
sed_cmd->sw_file = xfopen_for_write(sed_cmd->string);
sed_cmd->sw_last_char = '\n';
}
+ }
/* handle branch commands */
- } else if (strchr(":btT", sed_cmd->cmd)) {
+ else if (idx <= IDX_T) { /* :,b,t,T */
int length;
cmdstr = skip_whitespace(cmdstr);
}
}
/* translation command */
- else if (sed_cmd->cmd == 'y') {
+ else if (idx == IDX_y) {
char *match, *replace;
int i = cmdstr[0];
/* if it wasnt a single-letter command that takes no arguments
* then it must be an invalid command.
*/
- else if (strchr("dDgGhHlnNpPqx={}", sed_cmd->cmd) == 0) {
+ else if (idx >= IDX_nul) { /* not d,D,g,G,h,H,l,n,N,p,P,q,x,=,{,} */
bb_error_msg_and_die("unsupported command %c", sed_cmd->cmd);
}
static void add_cmd(const char *cmdstr)
{
sed_cmd_t *sed_cmd;
- int temp;
+ unsigned len, n;
/* Append this line to any unfinished line from last time. */
if (G.add_cmd_line) {
cmdstr = G.add_cmd_line = tp;
}
- /* If this line ends with backslash, request next line. */
- temp = strlen(cmdstr);
- if (temp && cmdstr[--temp] == '\\') {
+ /* If this line ends with unescaped backslash, request next line. */
+ n = len = strlen(cmdstr);
+ while (n && cmdstr[n-1] == '\\')
+ n--;
+ if ((len - n) & 1) { /* if odd number of trailing backslashes */
if (!G.add_cmd_line)
G.add_cmd_line = xstrdup(cmdstr);
- G.add_cmd_line[temp] = '\0';
+ G.add_cmd_line[len-1] = '\0';
return;
}
/* first part (if present) is an address: either a '$', a number or a /regex/ */
cmdstr += get_address(cmdstr, &sed_cmd->beg_line, &sed_cmd->beg_match);
+ sed_cmd->beg_line_orig = sed_cmd->beg_line;
/* second part (if present) will begin with a comma */
if (*cmdstr == ',') {
/* last part (mandatory) will be a command */
if (!*cmdstr)
bb_error_msg_and_die("missing command");
- sed_cmd->cmd = *(cmdstr++);
+ sed_cmd->cmd = *cmdstr++;
cmdstr = parse_cmd_args(sed_cmd, cmdstr);
+ /* cmdstr now points past args.
+ * GNU sed requires a separator, if there are more commands,
+ * else it complains "char N: extra characters after command".
+ * Example: "sed 'p;d'". We also allow "sed 'pd'".
+ */
+
/* Add the command to the command array */
- G.sed_cmd_tail->next = sed_cmd;
- G.sed_cmd_tail = G.sed_cmd_tail->next;
+ *G.sed_cmd_tail = sed_cmd;
+ G.sed_cmd_tail = &sed_cmd->next;
}
/* If we glued multiple lines together, free the memory. */
/* go through the replacement string */
for (i = 0; replace[i]; i++) {
- /* if we find a backreference (\1, \2, etc.) print the backref'ed * text */
+ /* if we find a backreference (\1, \2, etc.) print the backref'ed text */
if (replace[i] == '\\') {
unsigned backref = replace[++i] - '0';
if (backref <= 9) {
static int do_subst_command(sed_cmd_t *sed_cmd, char **line_p)
{
char *line = *line_p;
- int altered = 0;
unsigned match_count = 0;
+ bool altered = 0;
+ bool prev_match_empty = 1;
+ bool tried_at_eol = 0;
regex_t *current_regex;
current_regex = sed_cmd->sub_match;
G.previous_regex_ptr = current_regex;
/* Find the first match */
- if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0))
+ dbg("matching '%s'", line);
+ if (REG_NOMATCH == regexec(current_regex, line, 10, G.regmatch, 0)) {
+ dbg("no match");
return 0;
+ }
+ dbg("match");
/* Initialize temporary output buffer. */
G.pipeline.buf = xmalloc(PIPE_GROW);
/* Now loop through, substituting for matches */
do {
+ int start = G.regmatch[0].rm_so;
+ int end = G.regmatch[0].rm_eo;
int i;
- /* Work around bug in glibc regexec, demonstrated by:
- echo " a.b" | busybox sed 's [^ .]* x g'
- The match_count check is so not to break
- echo "hi" | busybox sed 's/^/!/g' */
- if (!G.regmatch[0].rm_so && !G.regmatch[0].rm_eo && match_count) {
- pipe_putc(*line++);
- continue;
- }
-
match_count++;
/* If we aren't interested in this match, output old line to
- end of match and continue */
+ * end of match and continue */
if (sed_cmd->which_match
&& (sed_cmd->which_match != match_count)
) {
- for (i = 0; i < G.regmatch[0].rm_eo; i++)
+ for (i = 0; i < end; i++)
pipe_putc(*line++);
- continue;
+ /* Null match? Print one more char */
+ if (start == end && *line)
+ pipe_putc(*line++);
+ goto next;
}
- /* print everything before the match */
- for (i = 0; i < G.regmatch[0].rm_so; i++)
+ /* Print everything before the match */
+ for (i = 0; i < start; i++)
pipe_putc(line[i]);
- /* then print the substitution string */
- do_subst_w_backrefs(line, sed_cmd->string);
+ /* Then print the substitution string,
+ * unless we just matched empty string after non-empty one.
+ * Example: string "cccd", pattern "c*", repl "R":
+ * result is "RdR", not "RRdR": first match "ccc",
+ * second is "" before "d", third is "" after "d".
+ * Second match is NOT replaced!
+ */
+ if (prev_match_empty || start != 0 || start != end) {
+ //dbg("%d %d %d", prev_match_empty, start, end);
+ dbg("inserting replacement at %d in '%s'", start, line);
+ do_subst_w_backrefs(line, sed_cmd->string);
+ /* Flag that something has changed */
+ altered = 1;
+ } else {
+ dbg("NOT inserting replacement at %d in '%s'", start, line);
+ }
- /* advance past the match */
- line += G.regmatch[0].rm_eo;
- /* flag that something has changed */
- altered++;
+ /* If matched string is empty (f.e. "c*" pattern),
+ * copy verbatim one char after it before attempting more matches
+ */
+ prev_match_empty = (start == end);
+ if (prev_match_empty) {
+ if (!line[end]) {
+ tried_at_eol = 1;
+ } else {
+ pipe_putc(line[end]);
+ end++;
+ }
+ }
+
+ /* Advance past the match */
+ dbg("line += %d", end);
+ line += end;
/* if we're not doing this globally, get out now */
- if (sed_cmd->which_match)
+ if (sed_cmd->which_match != 0)
break;
+ next:
+ /* Exit if we are at EOL and already tried matching at it */
+ if (*line == '\0') {
+ if (tried_at_eol)
+ break;
+ tried_at_eol = 1;
+ }
-//maybe (G.regmatch[0].rm_eo ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
- } while (*line && regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
+//maybe (end ? REG_NOTBOL : 0) instead of unconditional REG_NOTBOL?
+ } while (regexec(current_regex, line, 10, G.regmatch, REG_NOTBOL) != REG_NOMATCH);
/* Copy rest of string into output pipeline */
while (1) {
{
sed_cmd_t *sed_cmd;
- for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
+ for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
if (sed_cmd->cmd == ':' && sed_cmd->string && !strcmp(sed_cmd->string, label)) {
return sed_cmd;
}
static void append(char *s)
{
- llist_add_to_end(&G.append_head, xstrdup(s));
+ llist_add_to_end(&G.append_head, s);
+}
+
+/* Output line of text. */
+/* Note:
+ * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
+ * Without them, we had this:
+ * echo -n thingy >z1
+ * echo -n again >z2
+ * >znull
+ * sed "s/i/z/" z1 z2 znull | hexdump -vC
+ * output:
+ * gnu sed 4.1.5:
+ * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
+ * bbox:
+ * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
+ */
+enum {
+ NO_EOL_CHAR = 1,
+ LAST_IS_NUL = 2,
+};
+static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
+{
+ char lpc = *last_puts_char;
+
+ /* Need to insert a '\n' between two files because first file's
+ * last line wasn't terminated? */
+ if (lpc != '\n' && lpc != '\0') {
+ fputc('\n', file);
+ lpc = '\n';
+ }
+ fputs(s, file);
+
+ /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
+ if (s[0])
+ lpc = 'x';
+
+ /* had trailing '\0' and it was last char of file? */
+ if (last_gets_char == LAST_IS_NUL) {
+ fputc('\0', file);
+ lpc = 'x'; /* */
+ } else
+ /* had trailing '\n' or '\0'? */
+ if (last_gets_char != NO_EOL_CHAR) {
+ fputc(last_gets_char, file);
+ lpc = last_gets_char;
+ }
+
+ if (ferror(file)) {
+ xfunc_error_retval = 4; /* It's what gnu sed exits with... */
+ bb_error_msg_and_die(bb_msg_write_error);
+ }
+ *last_puts_char = lpc;
}
-static void flush_append(void)
+static void flush_append(char *last_puts_char, char last_gets_char)
{
char *data;
/* Output appended lines. */
while ((data = (char *)llist_pop(&G.append_head))) {
- fprintf(G.nonstdout, "%s\n", data);
+ puts_maybe_newline(data, G.nonstdout, last_puts_char, last_gets_char);
free(data);
}
}
-static void add_input_file(FILE *file)
-{
- G.input_file_list = xrealloc_vector(G.input_file_list, 2, G.input_file_count);
- G.input_file_list[G.input_file_count++] = file;
-}
-
/* Get next line of input from G.input_file_list, flushing append buffer and
* noting if we ran out of files without a newline on the last line we read.
*/
-enum {
- NO_EOL_CHAR = 1,
- LAST_IS_NUL = 2,
-};
-static char *get_next_line(char *gets_char)
+static char *get_next_line(char *gets_char, char *last_puts_char, char last_gets_char)
{
char *temp = NULL;
int len;
char gc;
- flush_append();
+ flush_append(last_puts_char, last_gets_char);
/* will be returned if last line in the file
* doesn't end with either '\n' or '\0' */
gc = NO_EOL_CHAR;
- while (G.current_input_file < G.input_file_count) {
- FILE *fp = G.input_file_list[G.current_input_file];
+ for (; G.current_input_file <= G.last_input_file; G.current_input_file++) {
+ FILE *fp = G.current_fp;
+ if (!fp) {
+ const char *path = G.input_file_list[G.current_input_file];
+ fp = stdin;
+ if (path != bb_msg_standard_input) {
+ fp = fopen_or_warn(path, "r");
+ if (!fp) {
+ G.exitcode = EXIT_FAILURE;
+ continue;
+ }
+ }
+ G.current_fp = fp;
+ }
/* Read line up to a newline or NUL byte, inclusive,
* return malloc'ed char[]. length of the chunk read
* is stored in len. NULL if EOF/error */
* (note: *no* newline after "b bang"!) */
}
/* Close this file and advance to next one */
- fclose(fp);
- G.current_input_file++;
+ fclose_if_not_stdin(fp);
+ G.current_fp = NULL;
}
*gets_char = gc;
return temp;
}
-/* Output line of text. */
-/* Note:
- * The tricks with NO_EOL_CHAR and last_puts_char are there to emulate gnu sed.
- * Without them, we had this:
- * echo -n thingy >z1
- * echo -n again >z2
- * >znull
- * sed "s/i/z/" z1 z2 znull | hexdump -vC
- * output:
- * gnu sed 4.1.5:
- * 00000000 74 68 7a 6e 67 79 0a 61 67 61 7a 6e |thzngy.agazn|
- * bbox:
- * 00000000 74 68 7a 6e 67 79 61 67 61 7a 6e |thzngyagazn|
- */
-static void puts_maybe_newline(char *s, FILE *file, char *last_puts_char, char last_gets_char)
-{
- char lpc = *last_puts_char;
-
- /* Need to insert a '\n' between two files because first file's
- * last line wasn't terminated? */
- if (lpc != '\n' && lpc != '\0') {
- fputc('\n', file);
- lpc = '\n';
- }
- fputs(s, file);
-
- /* 'x' - just something which is not '\n', '\0' or NO_EOL_CHAR */
- if (s[0])
- lpc = 'x';
-
- /* had trailing '\0' and it was last char of file? */
- if (last_gets_char == LAST_IS_NUL) {
- fputc('\0', file);
- lpc = 'x'; /* */
- } else
- /* had trailing '\n' or '\0'? */
- if (last_gets_char != NO_EOL_CHAR) {
- fputc(last_gets_char, file);
- lpc = last_gets_char;
- }
-
- if (ferror(file)) {
- xfunc_error_retval = 4; /* It's what gnu sed exits with... */
- bb_error_msg_and_die(bb_msg_write_error);
- }
- *last_puts_char = lpc;
-}
-
#define sed_puts(s, n) (puts_maybe_newline(s, G.nonstdout, &last_puts_char, n))
static int beg_match(sed_cmd_t *sed_cmd, const char *pattern_space)
int substituted;
/* Prime the pump */
- next_line = get_next_line(&next_gets_char);
+ next_line = get_next_line(&next_gets_char, &last_puts_char, '\n' /*last_gets_char*/);
/* Go through every line in each file */
again:
/* Read one line in advance so we can act on the last line,
* the '$' address */
- next_line = get_next_line(&next_gets_char);
+ next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char);
linenum++;
/* For every line, go through all the commands */
restart:
- for (sed_cmd = G.sed_cmd_head.next; sed_cmd; sed_cmd = sed_cmd->next) {
+ for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
int old_matched, matched;
old_matched = sed_cmd->in_match;
/* Determine if this command matches this line: */
+ dbg("match1:%d", sed_cmd->in_match);
+ dbg("match2:%d", (!sed_cmd->beg_line && !sed_cmd->end_line
+ && !sed_cmd->beg_match && !sed_cmd->end_match));
+ dbg("match3:%d", (sed_cmd->beg_line > 0
+ && (sed_cmd->end_line || sed_cmd->end_match
+ ? (sed_cmd->beg_line <= linenum)
+ : (sed_cmd->beg_line == linenum)
+ )
+ ));
+ dbg("match4:%d", (beg_match(sed_cmd, pattern_space)));
+ dbg("match5:%d", (sed_cmd->beg_line == -1 && next_line == NULL));
+
/* Are we continuing a previous multi-line match? */
sed_cmd->in_match = sed_cmd->in_match
/* Or is no range necessary? */
|| (!sed_cmd->beg_line && !sed_cmd->end_line
&& !sed_cmd->beg_match && !sed_cmd->end_match)
/* Or did we match the start of a numerical range? */
- || (sed_cmd->beg_line > 0 && (sed_cmd->beg_line <= linenum))
+ || (sed_cmd->beg_line > 0
+ && (sed_cmd->end_line || sed_cmd->end_match
+ /* note: even if end is numeric and is < linenum too,
+ * GNU sed matches! We match too, therefore we don't
+ * check here that linenum <= end.
+ * Example:
+ * printf '1\n2\n3\n4\n' | sed -n '1{N;N;d};1p;2,3p;3p;4p'
+ * first three input lines are deleted;
+ * 4th line is matched and printed
+ * by "2,3" (!) and by "4" ranges
+ */
+ ? (sed_cmd->beg_line <= linenum) /* N,end */
+ : (sed_cmd->beg_line == linenum) /* N */
+ )
+ )
/* Or does this line match our begin address regex? */
|| (beg_match(sed_cmd, pattern_space))
/* Or did we match last line of input? */
/* Snapshot the value */
matched = sed_cmd->in_match;
- //bb_error_msg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
- //sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
+ dbg("cmd:'%c' matched:%d beg_line:%d end_line:%d linenum:%d",
+ sed_cmd->cmd, matched, sed_cmd->beg_line, sed_cmd->end_line, linenum);
/* Is this line the end of the current match? */
if (matched) {
/* once matched, "n,xxx" range is dead, disabling it */
- if (sed_cmd->beg_line > 0)
+ if (sed_cmd->beg_line > 0) {
sed_cmd->beg_line = -2;
+ }
sed_cmd->in_match = !(
/* has the ending line come, or is this a single address command? */
- (sed_cmd->end_line ?
- sed_cmd->end_line == -1 ?
- !next_line
+ (sed_cmd->end_line
+ ? sed_cmd->end_line == -1
+ ? !next_line
: (sed_cmd->end_line <= linenum)
: !sed_cmd->end_match
)
/* or does this line matches our last address regex */
|| (sed_cmd->end_match && old_matched
&& (regexec(sed_cmd->end_match,
- pattern_space, 0, NULL, 0) == 0))
+ pattern_space, 0, NULL, 0) == 0)
+ )
);
}
/* Skip blocks of commands we didn't match */
if (sed_cmd->cmd == '{') {
if (sed_cmd->invert ? matched : !matched) {
- while (sed_cmd->cmd != '}') {
+ unsigned nest_cnt = 0;
+ while (1) {
+ if (sed_cmd->cmd == '{')
+ nest_cnt++;
+ if (sed_cmd->cmd == '}') {
+ nest_cnt--;
+ if (nest_cnt == 0)
+ break;
+ }
sed_cmd = sed_cmd->next;
if (!sed_cmd)
bb_error_msg_and_die("unterminated {");
}
/* actual sedding */
+ dbg("pattern_space:'%s' next_line:'%s' cmd:%c",
+ pattern_space, next_line, sed_cmd->cmd);
switch (sed_cmd->cmd) {
/* Print line number */
case 'P':
{
char *tmp = strchr(pattern_space, '\n');
-
if (tmp) {
*tmp = '\0';
/* TODO: explain why '\n' below */
case 'D':
{
char *tmp = strchr(pattern_space, '\n');
-
if (tmp) {
- tmp = xstrdup(tmp+1);
- free(pattern_space);
- pattern_space = tmp;
+ overlapping_strcpy(pattern_space, tmp + 1);
goto restart;
}
}
case 's':
if (!do_subst_command(sed_cmd, &pattern_space))
break;
+ dbg("do_subst_command succeeded:'%s'", pattern_space);
substituted |= 1;
/* handle p option */
/* Append line to linked list to be printed later */
case 'a':
- append(sed_cmd->string);
+ append(xstrdup(sed_cmd->string));
break;
/* Insert text before this line */
case 'c':
/* Only triggers on last line of a matching range. */
if (!sed_cmd->in_match)
- sed_puts(sed_cmd->string, NO_EOL_CHAR);
+ sed_puts(sed_cmd->string, '\n');
goto discard_line;
/* Read file, append contents to output */
case 'r':
{
FILE *rfile;
-
rfile = fopen_for_read(sed_cmd->string);
if (rfile) {
char *line;
-
while ((line = xmalloc_fgetline(rfile))
!= NULL)
append(line);
- xprint_and_close_file(rfile);
+ fclose(rfile);
}
break;
free(pattern_space);
pattern_space = next_line;
last_gets_char = next_gets_char;
- next_line = get_next_line(&next_gets_char);
+ next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char);
substituted = 0;
linenum++;
break;
{
int len;
/* If no next line, jump to end of script and exit. */
+ /* http://www.gnu.org/software/sed/manual/sed.html:
+ * "Most versions of sed exit without printing anything
+ * when the N command is issued on the last line of
+ * a file. GNU sed prints pattern space before exiting
+ * unless of course the -n command switch has been
+ * specified. This choice is by design."
+ */
if (next_line == NULL) {
- /* Jump to end of script and exit */
- free(next_line);
- next_line = NULL;
- goto discard_line;
- /* append next_line, read new next_line. */
+ //goto discard_line;
+ goto discard_commands; /* GNU behavior */
}
+ /* Append next_line, read new next_line. */
len = strlen(pattern_space);
- pattern_space = realloc(pattern_space, len + strlen(next_line) + 2);
+ pattern_space = xrealloc(pattern_space, len + strlen(next_line) + 2);
pattern_space[len] = '\n';
strcpy(pattern_space + len+1, next_line);
last_gets_char = next_gets_char;
- next_line = get_next_line(&next_gets_char);
+ next_line = get_next_line(&next_gets_char, &last_puts_char, last_gets_char);
linenum++;
break;
}
case 'y':
{
int i, j;
-
for (i = 0; pattern_space[i]; i++) {
for (j = 0; sed_cmd->string[j]; j += 2) {
if (pattern_space[i] == sed_cmd->string[j]) {
/* Delete and such jump here. */
discard_line:
- flush_append();
+ flush_append(&last_puts_char, last_gets_char);
free(pattern_space);
goto again;
/* It is possible to have a command line argument with embedded
* newlines. This counts as multiple command lines.
* However, newline can be escaped: 's/e/z\<newline>z/'
- * We check for this.
+ * add_cmd() handles this.
*/
static void add_cmd_block(char *cmdstr)
cmdstr = sv = xstrdup(cmdstr);
do {
eol = strchr(cmdstr, '\n');
- next:
- if (eol) {
- /* Count preceding slashes */
- int slashes = 0;
- char *sl = eol;
-
- while (sl != cmdstr && *--sl == '\\')
- slashes++;
- /* Odd number of preceding slashes - newline is escaped */
- if (slashes & 1) {
- overlapping_strcpy(eol - 1, eol);
- eol = strchr(eol, '\n');
- goto next;
- }
+ if (eol)
*eol = '\0';
- }
add_cmd(cmdstr);
cmdstr = eol + 1;
} while (eol);
int sed_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sed_main(int argc UNUSED_PARAM, char **argv)
{
- enum {
- OPT_in_place = 1 << 0,
- };
unsigned opt;
llist_t *opt_e, *opt_f;
- int status = EXIT_SUCCESS;
+ char *opt_i;
+
+#if ENABLE_LONG_OPTS
+ static const char sed_longopts[] ALIGN1 =
+ /* name has_arg short */
+ "in-place\0" Optional_argument "i"
+ "regexp-extended\0" No_argument "r"
+ "quiet\0" No_argument "n"
+ "silent\0" No_argument "n"
+ "expression\0" Required_argument "e"
+ "file\0" Required_argument "f";
+#endif
INIT_G();
if (ENABLE_FEATURE_CLEAN_UP) atexit(sed_free_and_close_stuff);
/* Lie to autoconf when it starts asking stupid questions. */
- if (argv[1] && !strcmp(argv[1], "--version")) {
+ if (argv[1] && strcmp(argv[1], "--version") == 0) {
puts("This is not GNU sed version 4.0");
return 0;
}
/* do normal option parsing */
opt_e = opt_f = NULL;
+ opt_i = NULL;
opt_complementary = "e::f::" /* can occur multiple times */
"nn"; /* count -n */
- opt = getopt32(argv, "irne:f:", &opt_e, &opt_f,
+
+ IF_LONG_OPTS(applet_long_options = sed_longopts);
+
+ /* -i must be first, to match OPT_in_place definition */
+ /* -E is a synonym of -r:
+ * GNU sed 4.2.1 mentions it in neither --help
+ * nor manpage, but does recognize it.
+ */
+ opt = getopt32(argv, "i::rEne:f:", &opt_i, &opt_e, &opt_f,
&G.be_quiet); /* counter for -n */
//argc -= optind;
argv += optind;
if (opt & OPT_in_place) { // -i
atexit(cleanup_outname);
}
- if (opt & 0x2) G.regex_type |= REG_EXTENDED; // -r
- //if (opt & 0x4) G.be_quiet++; // -n
+ if (opt & (2|4))
+ G.regex_type |= REG_EXTENDED; // -r or -E
+ //if (opt & 8)
+ // G.be_quiet++; // -n (implemented with a counter instead)
while (opt_e) { // -e
add_cmd_block(llist_pop(&opt_e));
}
fclose(cmdfile);
}
/* if we didn't get a pattern from -e or -f, use argv[0] */
- if (!(opt & 0x18)) {
+ if (!(opt & 0x30)) {
if (!*argv)
bb_show_usage();
add_cmd_block(*argv++);
/* argv[0..(argc-1)] should be names of file to process. If no
* files were specified or '-' was specified, take input from stdin.
* Otherwise, we process all the files specified. */
- if (argv[0] == NULL) {
+ G.input_file_list = argv;
+ if (!argv[0]) {
if (opt & OPT_in_place)
bb_error_msg_and_die(bb_msg_requires_arg, "-i");
- add_input_file(stdin);
- process_files();
+ argv[0] = (char*)bb_msg_standard_input;
+ /* G.last_input_file = 0; - already is */
} else {
- int i;
- FILE *file;
+ goto start;
- for (i = 0; argv[i]; i++) {
+ for (; *argv; argv++) {
struct stat statbuf;
int nonstdoutfd;
+ sed_cmd_t *sed_cmd;
- if (LONE_DASH(argv[i]) && !(opt & OPT_in_place)) {
- add_input_file(stdin);
- process_files();
- continue;
- }
- file = fopen_or_warn(argv[i], "r");
- if (!file) {
- status = EXIT_FAILURE;
- continue;
- }
+ G.last_input_file++;
+ start:
if (!(opt & OPT_in_place)) {
- add_input_file(file);
+ if (LONE_DASH(*argv)) {
+ *argv = (char*)bb_msg_standard_input;
+ process_files();
+ }
continue;
}
- G.outname = xasprintf("%sXXXXXX", argv[i]);
- nonstdoutfd = mkstemp(G.outname);
- if (-1 == nonstdoutfd)
- bb_perror_msg_and_die("cannot create temp file %s", G.outname);
- G.nonstdout = fdopen(nonstdoutfd, "w");
+ /* -i: process each FILE separately: */
- /* Set permissions of output file */
+ G.outname = xasprintf("%sXXXXXX", *argv);
+ nonstdoutfd = xmkstemp(G.outname);
+ G.nonstdout = xfdopen_for_write(nonstdoutfd);
- fstat(fileno(file), &statbuf);
+ /* Set permissions/owner of output file */
+ stat(*argv, &statbuf);
+ /* chmod'ing AFTER chown would preserve suid/sgid bits,
+ * but GNU sed 4.2.1 does not preserve them either */
fchmod(nonstdoutfd, statbuf.st_mode);
- add_input_file(file);
+ fchown(nonstdoutfd, statbuf.st_uid, statbuf.st_gid);
+
process_files();
fclose(G.nonstdout);
-
G.nonstdout = stdout;
- /* unlink(argv[i]); */
- xrename(G.outname, argv[i]);
+
+ if (opt_i) {
+ char *backupname = xasprintf("%s%s", *argv, opt_i);
+ xrename(*argv, backupname);
+ free(backupname);
+ }
+ /* else unlink(*argv); - rename below does this */
+ xrename(G.outname, *argv); //TODO: rollback backup on error?
free(G.outname);
G.outname = NULL;
+
+ /* Re-enable disabled range matches */
+ for (sed_cmd = G.sed_cmd_head; sed_cmd; sed_cmd = sed_cmd->next) {
+ sed_cmd->beg_line = sed_cmd->beg_line_orig;
+ }
}
- if (G.input_file_count > G.current_input_file)
- process_files();
+ /* Here, to handle "sed 'cmds' nonexistent_file" case we did:
+ * if (G.current_input_file[G.current_input_file] == NULL)
+ * return G.exitcode;
+ * but it's not needed since process_files() works correctly
+ * in this case too. */
}
- return status;
+ process_files();
+
+ return G.exitcode;
}
projects / platform / upstream / busybox.git / blobdiff