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revision.c: update show_object_with_name() without using malloc()

Allocating and then immediately freeing temporary memory a million times
when listing a million objects is distasteful.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
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commit beba25abbc34a07e07ce933210cda15202ef76cc 1 parent 91f1751
Junio C Hamano gitster authored
Showing with 36 additions and 14 deletions.
  1. +36 −14 revision.c
50 revision.c
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@@ -40,23 +40,45 @@ char *path_name(const struct name_path *path, const char *name)
return n;
}
+static int show_path_component_truncated(FILE *out, const char *name, int len)
+{
+ int cnt;
+ for (cnt = 0; cnt < len; cnt++) {
+ int ch = name[cnt];
+ if (!ch || ch == '\n')
+ return -1;
+ fputc(ch, out);
+ }
+ return len;
+}
+
+static int show_path_truncated(FILE *out, const struct name_path *path)
+{
+ int emitted, ours;
+
+ if (!path)
+ return 0;
+ emitted = show_path_truncated(out, path->up);
+ if (emitted < 0)
+ return emitted;
+ if (emitted)
+ fputc('/', out);
+ ours = show_path_component_truncated(out, path->elem, path->elem_len);
+ if (ours < 0)
+ return ours;
+ return ours || emitted;
+}
+
void show_object_with_name(FILE *out, struct object *obj, const struct name_path *path, const char *component)
{
- char *name = path_name(path, component);
- const char *ep = strchr(name, '\n');
+ struct name_path leaf;
+ leaf.up = (struct name_path *)path;
+ leaf.elem = component;
+ leaf.elem_len = strlen(component);
- /*
- * An object with name "foo\n0000000..." can be used to
- * confuse downstream "git pack-objects" very badly.
- */
- if (ep) {
- fprintf(out, "%s %.*s\n", sha1_to_hex(obj->sha1),
- (int) (ep - name),
- name);
- }
- else
- fprintf(out, "%s %s\n", sha1_to_hex(obj->sha1), name);
- free(name);
+ fprintf(out, "%s ", sha1_to_hex(obj->sha1));
+ show_path_truncated(out, &leaf);
+ fputc('\n', out);
}
void add_object(struct object *obj,
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