git-grep: don't use sscanf

[git.git] / diff.c

diff --git a/diff.c b/diff.c
index f033eb0622ec8c8fd5cecd8b0de23edcc0b24723..954ca83e0b0c95f55c0287d2deeb4cab76153fe0 100644 (file)
--- a/diff.c
+++ b/diff.c
@@ -382,6 +382,7 @@ struct emit_callback {
        int nparents, color_diff;
        const char **label_path;
        struct diff_words_data *diff_words;
+       int *found_changesp;
 };
 
 static void free_diff_words_data(struct emit_callback *ecbdata)
@@ -501,6 +502,8 @@ static void fn_out_consume(void *priv, char *line, unsigned long len)
        const char *set = diff_get_color(ecbdata->color_diff, DIFF_METAINFO);
        const char *reset = diff_get_color(ecbdata->color_diff, DIFF_RESET);
 
+       *(ecbdata->found_changesp) = 1;
+
        if (ecbdata->label_path[0]) {
                const char *name_a_tab, *name_b_tab;
 
@@ -1098,6 +1101,7 @@ static void builtin_diff(const char *name_a,
                if (complete_rewrite) {
                        emit_rewrite_diff(name_a, name_b, one, two,
                                        o->color_diff);
+                       o->found_changes = 1;
                        goto free_ab_and_return;
                }
        }
@@ -1115,6 +1119,7 @@ static void builtin_diff(const char *name_a,
                else
                        printf("Binary files %s and %s differ\n",
                               lbl[0], lbl[1]);
+               o->found_changes = 1;
        }
        else {
                /* Crazy xdl interfaces.. */
@@ -1127,6 +1132,7 @@ static void builtin_diff(const char *name_a,
                memset(&ecbdata, 0, sizeof(ecbdata));
                ecbdata.label_path = lbl;
                ecbdata.color_diff = o->color_diff;
+               ecbdata.found_changesp = &o->found_changes;
                xpp.flags = XDF_NEED_MINIMAL | o->xdl_opts;
                xecfg.ctxlen = o->context;
                xecfg.flags = XDL_EMIT_FUNCNAMES;
@@ -1358,6 +1364,32 @@ static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
        return e;
 }
 
+static int populate_from_stdin(struct diff_filespec *s)
+{
+#define INCREMENT 1024
+       char *buf;
+       unsigned long size;
+       int got;
+
+       size = 0;
+       buf = NULL;
+       while (1) {
+               buf = xrealloc(buf, size + INCREMENT);
+               got = xread(0, buf + size, INCREMENT);
+               if (!got)
+                       break; /* EOF */
+               if (got < 0)
+                       return error("error while reading from stdin %s",
+                                    strerror(errno));
+               size += got;
+       }
+       s->should_munmap = 0;
+       s->data = buf;
+       s->size = size;
+       s->should_free = 1;
+       return 0;
+}
+
 /*
  * While doing rename detection and pickaxe operation, we may need to
  * grab the data for the blob (or file) for our own in-core comparison.
@@ -1383,6 +1415,9 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                char *buf;
                unsigned long size;
 
+               if (!strcmp(s->path, "-"))
+                       return populate_from_stdin(s);
+
                if (lstat(s->path, &st) < 0) {
                        if (errno == ENOENT) {
                        err_empty:
@@ -1393,7 +1428,7 @@ int diff_populate_filespec(struct diff_filespec *s, int size_only)
                                return err;
                        }
                }
-               s->size = st.st_size;
+               s->size = xsize_t(st.st_size);
                if (!s->size)
                        goto empty;
                if (size_only)
@@ -1509,12 +1544,13 @@ static void prepare_temp_file(const char *name,
                if (S_ISLNK(st.st_mode)) {
                        int ret;
                        char buf[PATH_MAX + 1]; /* ought to be SYMLINK_MAX */
+                       size_t sz = xsize_t(st.st_size);
                        if (sizeof(buf) <= st.st_size)
                                die("symlink too long: %s", name);
-                       ret = readlink(name, buf, st.st_size);
+                       ret = readlink(name, buf, sz);
                        if (ret < 0)
                                die("readlink(%s)", name);
-                       prep_temp_blob(temp, buf, st.st_size,
+                       prep_temp_blob(temp, buf, sz,
                                       (one->sha1_valid ?
                                        one->sha1 : null_sha1),
                                       (one->sha1_valid ?
@@ -1683,6 +1719,10 @@ static void diff_fill_sha1_info(struct diff_filespec *one)
        if (DIFF_FILE_VALID(one)) {
                if (!one->sha1_valid) {
                        struct stat st;
+                       if (!strcmp(one->path, "-")) {
+                               hashcpy(one->sha1, null_sha1);
+                               return;
+                       }
                        if (lstat(one->path, &st) < 0)
                                die("stat %s", one->path);
                        if (index_path(one->sha1, one->path, &st, 0))
@@ -2132,7 +2172,7 @@ static int parse_num(const char **cp_p)
        /* user says num divided by scale and we say internally that
         * is MAX_SCORE * num / scale.
         */
-       return (num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale);
+       return (int)((num >= scale) ? MAX_SCORE : (MAX_SCORE * num / scale));
 }
 
 int diff_scoreopt_parse(const char *opt)
@@ -2456,7 +2496,8 @@ static void diff_resolve_rename_copy(void)
                                p->status = DIFF_STATUS_RENAMED;
                }
                else if (hashcmp(p->one->sha1, p->two->sha1) ||
-                        p->one->mode != p->two->mode)
+                        p->one->mode != p->two->mode ||
+                        is_null_sha1(p->one->sha1))
                        p->status = DIFF_STATUS_MODIFIED;
                else {
                        /* This is a "no-change" entry and should not