Demonstrate git-show is broken with ranges

diff --git a/convert.c b/convert.c
index 038b0be61723439844830f35ed2c72ab552769ba..12868ed7bda11648704ffe4e5d3415067764a6e2 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -658,7 +658,7 @@ static enum crlf_action git_path_check_crlf(const char *path, struct git_attr_ch
        return CRLF_GUESS;
 }
 
-static enum crlf_action git_path_check_eol(const char *path, struct git_attr_check *check)
+static enum eol git_path_check_eol(const char *path, struct git_attr_check *check)
 {
        const char *value = check->value;
 
@@ -876,43 +876,109 @@ int is_null_stream_filter(struct stream_filter *filter)
 /*
  * LF-to-CRLF filter
  */
+
+struct lf_to_crlf_filter {
+       struct stream_filter filter;
+       unsigned has_held:1;
+       char held;
+};
+
 static int lf_to_crlf_filter_fn(struct stream_filter *filter,
                                const char *input, size_t *isize_p,
                                char *output, size_t *osize_p)
 {
-       size_t count;
+       size_t count, o = 0;
+       struct lf_to_crlf_filter *lf_to_crlf = (struct lf_to_crlf_filter *)filter;
+
+       /*
+        * We may be holding onto the CR to see if it is followed by a
+        * LF, in which case we would need to go to the main loop.
+        * Otherwise, just emit it to the output stream.
+        */
+       if (lf_to_crlf->has_held && (lf_to_crlf->held != '\r' || !input)) {
+               output[o++] = lf_to_crlf->held;
+               lf_to_crlf->has_held = 0;
+       }
+
+       /* We are told to drain */
+       if (!input) {
+               *osize_p -= o;
+               return 0;
+       }
 
-       if (!input)
-               return 0; /* we do not keep any states */
        count = *isize_p;
-       if (count) {
-               size_t i, o;
-               for (i = o = 0; o < *osize_p && i < count; i++) {
+       if (count || lf_to_crlf->has_held) {
+               size_t i;
+               int was_cr = 0;
+
+               if (lf_to_crlf->has_held) {
+                       was_cr = 1;
+                       lf_to_crlf->has_held = 0;
+               }
+
+               for (i = 0; o < *osize_p && i < count; i++) {
                        char ch = input[i];
+
                        if (ch == '\n') {
-                               if (o + 1 < *osize_p)
-                                       output[o++] = '\r';
-                               else
-                                       break;
+                               output[o++] = '\r';
+                       } else if (was_cr) {
+                               /*
+                                * Previous round saw CR and it is not followed
+                                * by a LF; emit the CR before processing the
+                                * current character.
+                                */
+                               output[o++] = '\r';
+                       }
+
+                       /*
+                        * We may have consumed the last output slot,
+                        * in which case we need to break out of this
+                        * loop; hold the current character before
+                        * returning.
+                        */
+                       if (*osize_p <= o) {
+                               lf_to_crlf->has_held = 1;
+                               lf_to_crlf->held = ch;
+                               continue; /* break but increment i */
                        }
+
+                       if (ch == '\r') {
+                               was_cr = 1;
+                               continue;
+                       }
+
+                       was_cr = 0;
                        output[o++] = ch;
                }
 
                *osize_p -= o;
                *isize_p -= i;
+
+               if (!lf_to_crlf->has_held && was_cr) {
+                       lf_to_crlf->has_held = 1;
+                       lf_to_crlf->held = '\r';
+               }
        }
        return 0;
 }
 
+static void lf_to_crlf_free_fn(struct stream_filter *filter)
+{
+       free(filter);
+}
+
 static struct stream_filter_vtbl lf_to_crlf_vtbl = {
        lf_to_crlf_filter_fn,
-       null_free_fn,
+       lf_to_crlf_free_fn,
 };
 
-static struct stream_filter lf_to_crlf_filter_singleton = {
-       &lf_to_crlf_vtbl,
-};
+static struct stream_filter *lf_to_crlf_filter(void)
+{
+       struct lf_to_crlf_filter *lf_to_crlf = xcalloc(1, sizeof(*lf_to_crlf));
 
+       lf_to_crlf->filter.vtbl = &lf_to_crlf_vtbl;
+       return (struct stream_filter *)lf_to_crlf;
+}
 
 /*
  * Cascade filter
@@ -1194,7 +1260,7 @@ struct stream_filter *get_stream_filter(const char *path, const unsigned char *s
 
        else if (output_eol(crlf_action) == EOL_CRLF &&
                 !(crlf_action == CRLF_AUTO || crlf_action == CRLF_GUESS))
-               filter = cascade_filter(filter, &lf_to_crlf_filter_singleton);
+               filter = cascade_filter(filter, lf_to_crlf_filter());
 
        return filter;
 }