Re: [PATCH] diff: use 64-bit integers for diffstat calculations
On Sat, Apr 17, 2010 at 10:00:44AM -0700, Junio C Hamano wrote:
Show 11 quoted lines
> > The diffstat "added" and "changed" fields generally store
> > line counts; however, for binary files, they store file
> > sizes. Since we store and print these values as ints, a
> > diffstat on a file larger than 2G can show a negative size.
> > Instead, let's explicitly use 64-bit integers.
>
> Yes, but we would probably be better off using using uintmax_t for things
> like this if the quantity a variable represents is not closely tied to
> external file format (e.g. the offset field of pack idx file), nor the
> code is only for a particular platform (e.g. compat/win32mmap.c), don't
> you think?
But 640K^W 64-bits should be large enough for anyone! :)
But yes, you're right. Updated patch below.
-- >8 --
Subject: [PATCH] diff: use large integers for diffstat calculations
The diffstat "added" and "changed" fields generally store line counts; however, for binary files, they store file sizes. Since we store and print these values as ints, a diffstat on a file larger than 2G can show a negative size. Instead, let's use uintmax_t, which should be at least 64 bits on modern platforms.
Signed-off-by: Jeff King <peff@peff.net>
---
diff.c | 21 ++++++++++++---------
1 files changed, 12 insertions(+), 9 deletions(-)
diff --git a/diff.c b/diff.c
index 7effdac..fbdbd8d 100644
--- a/diff.c
+++ b/diff.c
@@ -936,7 +936,7 @@ struct diffstat_t {
unsigned is_unmerged:1;
unsigned is_binary:1;
unsigned is_renamed:1;
- unsigned int added, deleted;
+ uintmax_t added, deleted;
} **files;
};
@@ -1028,7 +1028,7 @@ static void fill_print_name(struct diffstat_file *file)
static void show_stats(struct diffstat_t *data, struct diff_options *options)
{
int i, len, add, del, adds = 0, dels = 0;
- int max_change = 0, max_len = 0;
+ uintmax_t max_change = 0, max_len = 0;
int total_files = data->nr;
int width, name_width;
const char *reset, *set, *add_c, *del_c;
@@ -1057,7 +1057,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
for (i = 0; i < data->nr; i++) {
struct diffstat_file *file = data->files[i];
- int change = file->added + file->deleted;
+ uintmax_t change = file->added + file->deleted;
fill_print_name(file);
len = strlen(file->print_name);
if (max_len < len)
@@ -1085,8 +1085,8 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
for (i = 0; i < data->nr; i++) {
const char *prefix = "";
char *name = data->files[i]->print_name;
- int added = data->files[i]->added;
- int deleted = data->files[i]->deleted;
+ uintmax_t added = data->files[i]->added;
+ uintmax_t deleted = data->files[i]->deleted;
int name_len;
/*
@@ -1107,9 +1107,11 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
if (data->files[i]->is_binary) {
show_name(options->file, prefix, name, len);
fprintf(options->file, " Bin ");
- fprintf(options->file, "%s%d%s", del_c, deleted, reset);
+ fprintf(options->file, "%s%"PRIuMAX"%s",
+ del_c, deleted, reset);
fprintf(options->file, " -> ");
- fprintf(options->file, "%s%d%s", add_c, added, reset);
+ fprintf(options->file, "%s%"PRIuMAX"%s",
+ add_c, added, reset);
fprintf(options->file, " bytes");
fprintf(options->file, "\n");
continue;
@@ -1138,7 +1140,7 @@ static void show_stats(struct diffstat_t *data, struct diff_options *options)
del = scale_linear(del, width, max_change);
}
show_name(options->file, prefix, name, len);
- fprintf(options->file, "%5d%s", added + deleted,
+ fprintf(options->file, "%5"PRIuMAX"%s", added + deleted,
added + deleted ? " " : "");
show_graph(options->file, '+', add, add_c, reset);
show_graph(options->file, '-', del, del_c, reset);
@@ -1188,7 +1190,8 @@ static void show_numstat(struct diffstat_t *data, struct diff_options *options)
fprintf(options->file, "-\t-\t");
else
fprintf(options->file,
- "%d\t%d\t", file->added, file->deleted);
+ "%"PRIuMAX"\t%"PRIuMAX"\t",
+ file->added, file->deleted);
if (options->line_termination) {
fill_print_name(file);
if (!file->is_renamed)
--
1.7.1.rc1.277.g2c4c9
