carets: properly display when no line feed is present

* src/location.c (location_caret): finish the line with one whether or not it
is present in input. Rewrite code without getline.
(cleanup_caret): Reset the caret_info global.
* bootstrap.conf: No longer require getline.

bootstrap.conf

@@ -21,7 +21,6 @@ gnulib_modules='
   configmake
   dirname
   error extensions fdl fopen-safer
-  getline
   getopt-gnu
   gettext git-version-gen gitlog-to-changelog
   gpl-3.0 hash inttypes isnan javacomp-script

lib/.gitignore

@@ -267,8 +267,6 @@
 /xstrndup.h
 /binary-io.c
 /xsize.c
-/getdelim.c
-/getline.c
 /bitrotate.c
 /math.c
 /sig-handler.c

m4/.gitignore

@@ -180,6 +180,4 @@
 /obstack-printf.m4
 /extern-inline.m4
 /non-recursive-gnulib-prefix-hack.m4
-/getdelim.m4
-/getline.m4
 /inline.m4

src/location.c

@@ -155,6 +155,9 @@ cleanup_caret ()
 {
   if (caret_info.source)
     fclose (caret_info.source);
+  caret_info.source = NULL;
+  caret_info.line = 1;
+  caret_info.offset = 0;
 }
 
 void
@@ -168,8 +171,8 @@ location_caret (FILE *out, location loc)
     return;
 
   /* If the line we want to quote is seekable (the same line as the previous
-     location), just seek it. If it was before, we lost track of it, so
+     location), just seek it. If it was a previous line, we lost track of it,
-     return to the start of file.  */
+     so return to the start of file.  */
   if (caret_info.line <= loc.start.line)
     fseek (caret_info.source, caret_info.offset, SEEK_SET);
   else
@@ -181,35 +184,36 @@ location_caret (FILE *out, location loc)
 
   /* Advance to the line's position, keeping track of the offset.  */
   while (caret_info.line < loc.start.line)
-    caret_info.line += fgetc (caret_info.source) == '\n';
+    caret_info.line += getc (caret_info.source) == '\n';
   caret_info.offset = ftell (caret_info.source);
 
   /* Read the actual line.  Don't update the offset, so that we keep a pointer
      to the start of the line.  */
   {
-    char *buf = NULL;
+    char c = getc (caret_info.source);
-    size_t size = 0;
+    if (c != EOF)
-    ssize_t len = getline (&buf, &size, caret_info.source);
-    if (0 < len)
       {
-        /* The caret of a multiline location ends with the first line.  */
-        int end = loc.start.line != loc.end.line ? len : loc.end.column;
-
         /* Quote the file, indent by a single column.  */
-        fputc (' ', out);
+        putc (' ', out);
-        fwrite (buf, 1, len, out);
+        do
+          putc (c, out);
+        while ((c = getc (caret_info.source)) != EOF && c != '\n');
+        putc ('\n', out);
 
-        /* Print the caret, with the same indent as above.  */
-        fprintf (out, " %*s", loc.start.column - 1, "");
         {
-          int i = loc.start.column;
+          /* The caret of a multiline location ends with the first line.  */
-          do
+          size_t len = loc.start.line != loc.end.line
-            fputc ('^', out);
+            ? ftell (caret_info.source) - caret_info.offset
-          while (++i < end);
+            : loc.end.column;
-        }
+          int i;
-        fputc ('\n', out);
+
+          /* Print the carets (at least one), with the same indent as above.*/
+          fprintf (out, " %*s", loc.start.column - 1, "");
+          for (i = loc.start.column; i == loc.start.column || i < len; ++i)
+            putc ('^', out);
+          }
+        putc ('\n', out);
       }
-    free (buf);
   }
 }