From d63bc6849c2a3b6ff0b909390488cb423208d61d Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Thu, 14 Jun 2018 14:10:17 -0500
Subject: Change do_lines() semantics to end with a callback(0,0) to indicate
 EOF, adjusting existing users.

---
 lib/lib.c        |  4 +++-
 toys/posix/cut.c |  5 +++--
 toys/posix/sed.c | 30 +++++++++++++++++-------------
 3 files changed, 23 insertions(+), 16 deletions(-)

diff --git a/lib/lib.c b/lib/lib.c
index 3bfe7fc4..77d8cc8f 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -644,7 +644,7 @@ void loopfiles(char **argv, void (*function)(int fd, char *name))
   loopfiles_rw(argv, O_RDONLY|O_CLOEXEC|WARN_ONLY, 0, function);
 }
 
-// call loopfiles with do_lines()
+// glue to call dl_lines() from loopfiles
 static void (*do_lines_bridge)(char **pline, long len);
 static void loopfile_lines_bridge(int fd, char *name)
 {
@@ -1344,6 +1344,7 @@ char *getgroupname(gid_t gid)
 // Iterate over lines in file, calling function. Function can write 0 to
 // the line pointer if they want to keep it, or 1 to terminate processing,
 // otherwise line is freed. Passed file descriptor is closed at the end.
+// At EOF calls function(0, 0)
 void do_lines(int fd, void (*call)(char **pline, long len))
 {
   FILE *fp = fd ? xfdopen(fd, "r") : stdin;
@@ -1359,6 +1360,7 @@ void do_lines(int fd, void (*call)(char **pline, long len))
       free(line);
     } else break;
   }
+  call(0, 0);
 
   if (fd) fclose(fp);
 }
diff --git a/toys/posix/cut.c b/toys/posix/cut.c
index 2676d932..f61073f1 100644
--- a/toys/posix/cut.c
+++ b/toys/posix/cut.c
@@ -70,14 +70,15 @@ int unicolumns(char *start, unsigned columns)
   return ss-start;
 }
 
-
 // Apply selections to an input line, producing output
 static void cut_line(char **pline, long len)
 {
   unsigned *pairs = (void *)toybuf;
-  char *line = *pline;
+  char *line;
   int i, j;
 
+  if (!pline) return;
+  line = *pline;
   if (len && line[len-1]=='\n') line[--len] = 0;
 
   // Loop through selections
diff --git a/toys/posix/sed.c b/toys/posix/sed.c
index cf7d15e9..17d8bcde 100644
--- a/toys/posix/sed.c
+++ b/toys/posix/sed.c
@@ -6,9 +6,10 @@
  *
  * TODO: lines > 2G could wrap signed int length counters. Not just getline()
  * but N and s///
- * TODO: make y// handle unicode
+ * TODO: make y// handle unicode, unicode delimiters
  * TODO: handle error return from emit(), error_msg/exit consistently
  *       What's the right thing to do for -i when write fails? Skip to next?
+ * test '//q' with no previous regex, also repeat previous regex?
 
 USE_SED(NEWTOY(sed, "(help)(version)e*f*inEr[+Er]", TOYFLAG_USR|TOYFLAG_BIN|TOYFLAG_LOCALE|TOYFLAG_NOHELP))
 
@@ -247,7 +248,7 @@ static void *get_regex(void *trump, int offset)
 }
 
 // Apply pattern to line from input file
-static void process_line(char **pline, long plen)
+static void sed_line(char **pline, long plen)
 {
   struct append {
     struct append *next, *prev;
@@ -259,6 +260,9 @@ static void process_line(char **pline, long plen)
   struct sedcmd *command;
   int eol = 0, tea = 0;
 
+  // Ignore EOF for all files before last unless -i
+  if (!pline && !(toys.optflags&FLAG_i)) return;
+
   // Grab next line for deferred processing (EOF detection: we get a NULL
   // pline at EOF to flush last line). Note that only end of _last_ input
   // file matches $ (unless we're doing -i).
@@ -622,7 +626,7 @@ done:
 }
 
 // Callback called on each input file
-static void do_sed(int fd, char *name)
+static void do_sed_file(int fd, char *name)
 {
   int i = toys.optflags & FLAG_i;
   char *tmp;
@@ -630,18 +634,14 @@ static void do_sed(int fd, char *name)
   if (i) {
     struct sedcmd *command;
 
-    if (!fd) {
-      error_msg("-i on stdin");
-      return;
-    }
+    if (!fd) return error_msg("-i on stdin");
     TT.fdout = copy_tempfile(fd, name, &tmp);
     TT.count = 0;
     for (command = (void *)TT.pattern; command; command = command->next)
       command->hit = 0;
   }
-  do_lines(fd, process_line);
+  do_lines(fd, sed_line);
   if (i) {
-    process_line(0, 0);
     replace_tempfile(-1, TT.fdout, &tmp);
     TT.fdout = 1;
     TT.nextline = 0;
@@ -727,7 +727,7 @@ static void parse_pattern(char **pline, long len)
 
   // Append this line to previous multiline command? (hit indicates type.)
   // During parsing "hit" stores data about line continuations, but in
-  // process_line() it means the match range attached to this command
+  // sed_line() it means the match range attached to this command
   // is active, so processing the continuation must zero it again.
   if (command && command->prev->hit) {
     // Remove half-finished entry from list so remalloc() doesn't confuse it
@@ -1016,8 +1016,8 @@ void sed_main(void)
   // so handle all -e, then all -f. (At least the behavior's consistent.)
 
   for (al = TT.e; al; al = al->next) parse_pattern(&al->arg, strlen(al->arg));
-  for (al = TT.f; al; al = al->next) do_lines(xopenro(al->arg), parse_pattern);
   parse_pattern(0, 0);
+  for (al = TT.f; al; al = al->next) do_lines(xopenro(al->arg), parse_pattern);
   dlist_terminate(TT.pattern);
   if (TT.nextlen) error_exit("no }");  
 
@@ -1025,9 +1025,13 @@ void sed_main(void)
   TT.remember = xstrdup("");
 
   // Inflict pattern upon input files. Long version because !O_CLOEXEC
-  loopfiles_rw(args, O_RDONLY|WARN_ONLY, 0, do_sed);
+  loopfiles_rw(args, O_RDONLY|WARN_ONLY, 0, do_sed_file);
 
-  if (!(toys.optflags & FLAG_i)) process_line(0, 0);
+  // Provide EOF flush at end of cumulative input for non-i mode.
+  if (!(toys.optflags & FLAG_i)) {
+    toys.optflags |= FLAG_i;
+    sed_line(0, 0);
+  }
 
   // todo: need to close fd when done for TOYBOX_FREE?
 }
-- 
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