xsize_t: check whether we lose bits

diff --git a/builtin-grep.c b/builtin-grep.c
index 96b70227cf073517c309dbc8b042085f1040dab5..694da5ba09d302c1e44f863070776bc3ac7f32e2 100644 (file)
--- a/builtin-grep.c
+++ b/builtin-grep.c
@@ -122,6 +122,8 @@ static int grep_file(struct grep_opt *opt, const char *filename)
        struct stat st;
        int i;
        char *data;
+       size_t sz;
+
        if (lstat(filename, &st) < 0) {
        err_ret:
                if (errno != ENOENT)
@@ -132,11 +134,12 @@ static int grep_file(struct grep_opt *opt, const char *filename)
                return 0; /* empty file -- no grep hit */
        if (!S_ISREG(st.st_mode))
                return 0;
+       sz = xsize_t(st.st_size);
        i = open(filename, O_RDONLY);
        if (i < 0)
                goto err_ret;
-       data = xmalloc(st.st_size + 1);
-       if (st.st_size != read_in_full(i, data, st.st_size)) {
+       data = xmalloc(sz + 1);
+       if (st.st_size != read_in_full(i, data, sz)) {
                error("'%s': short read %s", filename, strerror(errno));
                close(i);
                free(data);
@@ -145,11 +148,12 @@ static int grep_file(struct grep_opt *opt, const char *filename)
        close(i);
        if (opt->relative && opt->prefix_length)
                filename += opt->prefix_length;
-       i = grep_buffer(opt, filename, data, st.st_size);
+       i = grep_buffer(opt, filename, data, sz);
        free(data);
        return i;
 }
 
+#ifdef __unix__
 static int exec_grep(int argc, const char **argv)
 {
        pid_t pid;
@@ -298,6 +302,7 @@ static int external_grep(struct grep_opt *opt, const char **paths, int cached)
        }
        return hit;
 }
+#endif
 
 static int grep_cache(struct grep_opt *opt, const char **paths, int cached)
 {