perf probe: Rewrite find_lazy_match_lines() by using getline(3)

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: lkml <linux-kernel@vger.kernel.org>
LKML-Reference: <m3d3o185u1.fsf@gmail.com>
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 69215bf..46addfb 100644 (file)
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1234,51 +1234,38 @@ static int find_probe_point_by_line(struct probe_finder *pf)
 static int find_lazy_match_lines(struct list_head *head,
                                 const char *fname, const char *pat)
 {
-       char *fbuf, *p1, *p2;
-       int fd, line, nlines = -1;
-       struct stat st;
-
-       fd = open(fname, O_RDONLY);
-       if (fd < 0) {
-               pr_warning("Failed to open %s: %s\n", fname, strerror(-fd));
+       FILE *fp;
+       char *line = NULL;
+       size_t line_len;
+       ssize_t len;
+       int count = 0, linenum = 1;
+
+       fp = fopen(fname, "r");
+       if (!fp) {
+               pr_warning("Failed to open %s: %s\n", fname, strerror(errno));
                return -errno;
        }
 
-       if (fstat(fd, &st) < 0) {
-               pr_warning("Failed to get the size of %s: %s\n",
-                          fname, strerror(errno));
-               nlines = -errno;
-               goto out_close;
-       }
-
-       nlines = -ENOMEM;
-       fbuf = malloc(st.st_size + 2);
-       if (fbuf == NULL)
-               goto out_close;
-       if (read(fd, fbuf, st.st_size) < 0) {
-               pr_warning("Failed to read %s: %s\n", fname, strerror(errno));
-               nlines = -errno;
-               goto out_free_fbuf;
-       }
-       fbuf[st.st_size] = '\n';        /* Dummy line */
-       fbuf[st.st_size + 1] = '\0';
-       p1 = fbuf;
-       line = 1;
-       nlines = 0;
-       while ((p2 = strchr(p1, '\n')) != NULL) {
-               *p2 = '\0';
-               if (strlazymatch(p1, pat)) {
-                       line_list__add_line(head, line);
-                       nlines++;
+       while ((len = getline(&line, &line_len, fp)) > 0) {
+
+               if (line[len - 1] == '\n')
+                       line[len - 1] = '\0';
+
+               if (strlazymatch(line, pat)) {
+                       line_list__add_line(head, linenum);
+                       count++;
                }
-               line++;
-               p1 = p2 + 1;
+               linenum++;
        }
-out_free_fbuf:
-       free(fbuf);
-out_close:
-       close(fd);
-       return nlines;
+
+       if (ferror(fp))
+               count = -errno;
+       free(line);
+       fclose(fp);
+
+       if (count == 0)
+               pr_debug("No matched lines found in %s.\n", fname);
+       return count;
 }
 
 static int probe_point_lazy_walker(const char *fname, int lineno,
@@ -1312,10 +1299,7 @@ static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
                /* Matching lazy line pattern */
                ret = find_lazy_match_lines(&pf->lcache, pf->fname,
                                            pf->pev->point.lazy_line);
-               if (ret == 0) {
-                       pr_debug("No matched lines found in %s.\n", pf->fname);
-                       return 0;
-               } else if (ret < 0)
+               if (ret <= 0)
                        return ret;
        }