X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=sed.c;h=24b62e5fab6ba669c26c9f21faa018b5efe22c04;hb=044228d5ecb9b79397f9fc915d046cf4538281e2;hp=21614fc77749d2ac5dc0e4133bb06040a85e6326;hpb=dd527d3c6215dba1ad7ddcdd6f393b9fff6dddef;p=oweals%2Fbusybox.git

diff --git a/sed.c b/sed.c
index 21614fc77..24b62e5fa 100644
--- a/sed.c
+++ b/sed.c
@@ -156,7 +156,7 @@ static int index_of_next_unescaped_regexp_delim(struct sed_cmd *sed_cmd, const c
 /*
  * returns the index in the string just past where the address ends.
  */
-static int get_address(struct sed_cmd *sed_cmd, const char *str, int *line, regex_t **regex)
+static int get_address(struct sed_cmd *sed_cmd, const char *str, int *linenum, regex_t **regex)
 {
 	char *my_str = strdup(str);
 	int idx = 0;
@@ -169,10 +169,10 @@ static int get_address(struct sed_cmd *sed_cmd, const char *str, int *line, rege
 			idx++;
 		} while (isdigit(my_str[idx]));
 		my_str[idx] = 0;
-		*line = atoi(my_str);
+		*linenum = atoi(my_str);
 	}
 	else if (my_str[idx] == '$') {
-		*line = -1;
+		*linenum = -1;
 		idx++;
 	}
 	else if (my_str[idx] == '/') {
@@ -195,15 +195,6 @@ static int get_address(struct sed_cmd *sed_cmd, const char *str, int *line, rege
 	return idx;
 }
 
-static char *strdup_substr(const char *str, int start, int end)
-{
-	int size = end - start + 1;
-	char *newstr = xmalloc(size);
-	memcpy(newstr, str+start, size-1);
-	newstr[size-1] = '\0';
-	return newstr;
-}
-
 static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
 {
 	int oldidx, cflags = REG_NEWLINE;
@@ -232,7 +223,7 @@ static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
 	idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx);
 	if (idx == -1)
 		error_msg_and_die("bad format in substitution expression");
-	match = strdup_substr(substr, oldidx, idx);
+	match = xstrndup(substr + oldidx, idx - oldidx);
 
 	/* determine the number of back references in the match string */
 	/* Note: we compute this here rather than in the do_subst_command()
@@ -251,7 +242,7 @@ static int parse_subst_cmd(struct sed_cmd *sed_cmd, const char *substr)
 	idx = index_of_next_unescaped_regexp_delim(sed_cmd, substr, ++idx);
 	if (idx == -1)
 		error_msg_and_die("bad format in substitution expression");
-	sed_cmd->replace = strdup_substr(substr, oldidx, idx);
+	sed_cmd->replace = xstrndup(substr + oldidx, idx - oldidx);
 
 	/* process the flags */
 	while (substr[++idx]) {
@@ -388,9 +379,8 @@ static int parse_file_cmd(struct sed_cmd *sed_cmd, const char *filecmdstr)
 	/* the first non-whitespace we get is a filename. the filename ends when we
 	 * hit a normal sed command terminator or end of string */
 	filenamelen = strcspn(&filecmdstr[idx], "; \n\r\t\v\0");
-	sed_cmd->filename = xmalloc(sizeof(char) * filenamelen + 1);
-	strncpy(sed_cmd->filename, &filecmdstr[idx], filenamelen);
-	sed_cmd->filename[filenamelen] = 0;
+	sed_cmd->filename = xmalloc(filenamelen + 1);
+	safe_strncpy(sed_cmd->filename, &filecmdstr[idx], filenamelen + 1);
 
 	return idx + filenamelen;
 }
@@ -424,13 +414,13 @@ static char *parse_cmd_str(struct sed_cmd *sed_cmd, const char *cmdstr)
 	if (strchr("pd", cmdstr[idx])) {
 		idx++;
 	}
-	/*  handle (s)ubstitution */
+	/* handle (s)ubstitution command */
 	else if (sed_cmd->cmd == 's') {
 		idx += parse_subst_cmd(sed_cmd, &cmdstr[idx]);
 	}
 	/* handle edit cmds: (a)ppend, (i)nsert, and (c)hange */
-	else if (strchr("aic", cmdstr[idx])) {
-		if (sed_cmd->end_line || sed_cmd->end_match)
+	else if (strchr("aic", sed_cmd->cmd)) {
+		if ((sed_cmd->end_line || sed_cmd->end_match) && sed_cmd->cmd != 'c')
 			error_msg_and_die("only a beginning address can be specified for edit commands");
 		idx += parse_edit_cmd(sed_cmd, &cmdstr[idx]);
 	}
@@ -577,9 +567,7 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
 			break;
 	}
 
-	/* if there's anything left of the line, print it */
-	if (*hackline)
-		fputs(hackline, stdout);
+	puts(hackline);
 
 	/* cleanup */
 	free(regmatch);
@@ -587,91 +575,13 @@ static int do_subst_command(const struct sed_cmd *sed_cmd, const char *line)
 	return altered;
 }
 
-static int do_sed_command(const struct sed_cmd *sed_cmd, const char *line) 
-{
-	int altered = 0;
-
-	switch (sed_cmd->cmd) {
-
-		case 'p':
-			fputs(line, stdout);
-			break;
-
-		case 'd':
-			altered++;
-			break;
-
-		case 's':
-
-			/*
-			 * Some special cases for 's' printing to make it compliant with
-			 * GNU sed printing behavior (aka "The -n | s///p Matrix"):
-			 *
-			 *    -n ONLY = never print anything regardless of any successful
-			 *    substitution
-			 *
-			 *    s///p ONLY = always print successful substitutions, even if
-			 *    the line is going to be printed anyway (line will be printed
-			 *    twice).
-			 *
-			 *    -n AND s///p = print ONLY a successful substitution ONE TIME;
-			 *    no other lines are printed - this is the reason why the 'p'
-			 *    flag exists in the first place.
-			 */
-
-			/* if the user specified that they didn't want anything printed (i.e. a -n
-			 * flag and no 'p' flag after the s///), then there's really no point doing
-			 * anything here. */
-			if (be_quiet && !sed_cmd->sub_p)
-				break;
-
-			/* we print the line once, unless we were told to be quiet */
-			if (!be_quiet)
-				altered = do_subst_command(sed_cmd, line);
-
-			/* we also print the line if we were given the 'p' flag
-			 * (this is quite possibly the second printing) */
-			if (sed_cmd->sub_p)
-				altered = do_subst_command(sed_cmd, line);
-
-			break;
-
-		case 'a':
-			puts(line);
-			fputs(sed_cmd->editline, stdout);
-			altered++;
-			break;
-
-		case 'i':
-			fputs(sed_cmd->editline, stdout);
-			break;
-
-		case 'c':
-			fputs(sed_cmd->editline, stdout);
-			altered++;
-			break;
-
-		case 'r': {
-			FILE *file;
-			puts(line);
-			file = fopen(sed_cmd->filename, "r");
-			if (file)
-				print_file(file);
-			/* else if we couldn't open the file, no biggie, just don't print anything */
-			altered++;
-			}
-			break;
-	}
-
-	return altered;
-}
 
 static void process_file(FILE *file)
 {
 	char *line = NULL;
 	static int linenum = 0; /* GNU sed does not restart counting lines at EOF */
 	unsigned int still_in_range = 0;
-	int line_altered;
+	int altered;
 	int i;
 
 	/* go through every line in the file */
@@ -679,51 +589,148 @@ static void process_file(FILE *file)
 
 		chomp(line);
 		linenum++;
-		line_altered = 0;
+		altered = 0;
 
 		/* for every line, go through all the commands */
 		for (i = 0; i < ncmds; i++) {
 
-			/* are we acting on a range of matched lines? */
-			if (sed_cmds[i].beg_match && sed_cmds[i].end_match) {
-				if (still_in_range || regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0) {
-					line_altered += do_sed_command(&sed_cmds[i], line);
-					if (still_in_range && regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0)
-						still_in_range = 0;
-					else
-						still_in_range = 1;
-				}
-			}
 
-			/* are we trying to match a single line? */
-			else if (sed_cmds[i].beg_match) {
-				if (regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0)
-					line_altered += do_sed_command(&sed_cmds[i], line);
-			}
+			/*
+			 * entry point into sedding...
+			 */
+			if (
+					/* no range necessary */
+					(sed_cmds[i].beg_line == 0 && sed_cmds[i].end_line == 0 &&
+					 sed_cmds[i].beg_match == NULL &&
+					 sed_cmds[i].end_match == NULL) ||
+					/* this line number is the first address we're looking for */
+					(sed_cmds[i].beg_line && (sed_cmds[i].beg_line == linenum)) ||
+					/* this line matches our first address regex */
+					(sed_cmds[i].beg_match && (regexec(sed_cmds[i].beg_match, line, 0, NULL, 0) == 0)) ||
+					/* we are currently within the beginning & ending address range */
+					still_in_range
+			   ) {
+
+				/*
+				 * actual sedding
+				 */
+				switch (sed_cmds[i].cmd) {
+
+					case 'p':
+						puts(line);
+						break;
+
+					case 'd':
+						altered++;
+						break;
+
+					case 's':
+
+						/*
+						 * Some special cases for 's' printing to make it compliant with
+						 * GNU sed printing behavior (aka "The -n | s///p Matrix"):
+						 *
+						 *    -n ONLY = never print anything regardless of any successful
+						 *    substitution
+						 *
+						 *    s///p ONLY = always print successful substitutions, even if
+						 *    the line is going to be printed anyway (line will be printed
+						 *    twice).
+						 *
+						 *    -n AND s///p = print ONLY a successful substitution ONE TIME;
+						 *    no other lines are printed - this is the reason why the 'p'
+						 *    flag exists in the first place.
+						 */
+
+						/* if the user specified that they didn't want anything printed (i.e., a -n
+						 * flag and no 'p' flag after the s///), then there's really no point doing
+						 * anything here. */
+						if (be_quiet && !sed_cmds[i].sub_p)
+							break;
+
+						/* we print the line once, unless we were told to be quiet */
+						if (!be_quiet)
+							altered = do_subst_command(&sed_cmds[i], line);
+
+						/* we also print the line if we were given the 'p' flag
+						 * (this is quite possibly the second printing) */
+						if (sed_cmds[i].sub_p)
+							altered = do_subst_command(&sed_cmds[i], line);
+
+						break;
+
+					case 'a':
+						puts(line);
+						fputs(sed_cmds[i].editline, stdout);
+						altered++;
+						break;
+
+					case 'i':
+						fputs(sed_cmds[i].editline, stdout);
+						break;
+
+					case 'c':
+						/* single-address case */
+						if (sed_cmds[i].end_match == NULL && sed_cmds[i].end_line == 0) {
+							fputs(sed_cmds[i].editline, stdout);
+						}
+						/* multi-address case */
+						else {
+							/* matching text */
+							if (sed_cmds[i].end_match && (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0))
+								fputs(sed_cmds[i].editline, stdout);
+							/* matching line numbers */
+							if (sed_cmds[i].end_line > 0 && sed_cmds[i].end_line == linenum)
+								fputs(sed_cmds[i].editline, stdout);
+						}
+						altered++;
+
+						break;
+
+					case 'r': {
+								  FILE *outfile;
+								  puts(line);
+								  outfile = fopen(sed_cmds[i].filename, "r");
+								  if (outfile)
+									  print_file(outfile);
+								  /* else if we couldn't open the output file,
+								   * no biggie, just don't print anything */
+								  altered++;
+							  }
+							  break;
+				}
 
-			/* are we acting on a range of line numbers? */
-			else if (sed_cmds[i].beg_line > 0 && sed_cmds[i].end_line != 0) {
-				if (linenum >= sed_cmds[i].beg_line &&
-						(sed_cmds[i].end_line == -1 || linenum <= sed_cmds[i].end_line))
-					line_altered += do_sed_command(&sed_cmds[i], line);
-			}
+				/*
+				 * exit point from sedding...
+				 */
+				if (
+					/* this is a single-address command or... */
+					(sed_cmds[i].end_line == 0 && sed_cmds[i].end_match == NULL) || (
+						/* we were in the middle of our address range (this
+						 * isn't the first time through) and.. */
+						(still_in_range == 1) && (
+							/* this line number is the last address we're looking for or... */
+							(sed_cmds[i].end_line && (sed_cmds[i].end_line == linenum)) ||
+							/* this line matches our last address regex */
+							(sed_cmds[i].end_match && (regexec(sed_cmds[i].end_match, line, 0, NULL, 0) == 0))
+						)
+					)
+				) {
+					/* we're out of our address range */
+					still_in_range = 0;
+				}
 
-			/* are we acting on a specified line number */
-			else if (sed_cmds[i].beg_line > 0) {
-				if (linenum == sed_cmds[i].beg_line)
-					line_altered += do_sed_command(&sed_cmds[i], line);
+				/* didn't hit the exit? then we're still in the middle of an address range */
+				else {
+					still_in_range = 1;
+				}
 			}
-
-			/* not acting on matches or line numbers. act on every line */
-			else 
-				line_altered += do_sed_command(&sed_cmds[i], line);
-
 		}
 
 		/* we will print the line unless we were told to be quiet or if the
 		 * line was altered (via a 'd'elete or 's'ubstitution), in which case
 		 * the altered line was already printed */
-		if (!be_quiet && !line_altered)
+		if (!be_quiet && !altered)
 			puts(line);
 
 		free(line);