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    Subject[tip:perf/core] perf probe: Don't always consider EOF as an error when listing source code
    Commit-ID:  fde52dbd7f71934aba4e150f3d1d51e826a08850
    Gitweb: http://git.kernel.org/tip/fde52dbd7f71934aba4e150f3d1d51e826a08850
    Author: Franck Bui-Huu <fbuihuu@gmail.com>
    AuthorDate: Mon, 20 Dec 2010 15:18:04 +0100
    Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
    CommitDate: Tue, 21 Dec 2010 16:20:12 -0200

    perf probe: Don't always consider EOF as an error when listing source code

    When listing a whole file or a function which is located at the end,
    perf-probe -L output wrongly: "Source file is shorter than expected.".

    This is because show_one_line() always consider EOF as an error.

    This patch fixes this by not considering EOF as an error when dumping
    the trailing lines. Otherwise it's still an error and perf-probe still
    outputs its warning.

    Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
    LKML-Reference: <1292854685-8230-6-git-send-email-fbuihuu@gmail.com>
    Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
    ---
    tools/perf/util/probe-event.c | 38 ++++++++++++++++++++++++++------------
    1 files changed, 26 insertions(+), 12 deletions(-)

    diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
    index 3ba9c53..80cc0bc 100644
    --- a/tools/perf/util/probe-event.c
    +++ b/tools/perf/util/probe-event.c
    @@ -287,7 +287,7 @@ static int get_real_path(const char *raw_path, const char *comp_dir,
    #define LINEBUF_SIZE 256
    #define NR_ADDITIONAL_LINES 2

    -static int show_one_line(FILE *fp, int l, bool skip, bool show_num)
    +static int __show_one_line(FILE *fp, int l, bool skip, bool show_num)
    {
    char buf[LINEBUF_SIZE];
    const char *color = show_num ? "" : PERF_COLOR_BLUE;
    @@ -306,16 +306,30 @@ static int show_one_line(FILE *fp, int l, bool skip, bool show_num)

    } while (strchr(buf, '\n') == NULL);

    - return 0;
    + return 1;
    error:
    - if (feof(fp))
    + if (ferror(fp)) {
    pr_warning("Source file is shorter than expected.\n");
    - else
    - pr_warning("File read error: %s\n", strerror(errno));
    + return -1;
    + }
    + return 0;
    +}

    - return -1;
    +static int _show_one_line(FILE *fp, int l, bool skip, bool show_num)
    +{
    + int rv = __show_one_line(fp, l, skip, show_num);
    + if (rv == 0) {
    + pr_warning("Source file is shorter than expected.\n");
    + rv = -1;
    + }
    + return rv;
    }

    +#define show_one_line_with_num(f,l) _show_one_line(f,l,false,true)
    +#define show_one_line(f,l) _show_one_line(f,l,false,false)
    +#define skip_one_line(f,l) _show_one_line(f,l,true,false)
    +#define show_one_line_or_eof(f,l) __show_one_line(f,l,false,false)
    +
    /*
    * Show line-range always requires debuginfo to find source file and
    * line number.
    @@ -374,27 +388,27 @@ int show_line_range(struct line_range *lr, const char *module)
    }
    /* Skip to starting line number */
    while (l < lr->start) {
    - ret = show_one_line(fp, l++, true, false);
    + ret = skip_one_line(fp, l++);
    if (ret < 0)
    goto end;
    }

    list_for_each_entry(ln, &lr->line_list, list) {
    for (; ln->line > l; l++) {
    - ret = show_one_line(fp, l - lr->offset, false, false);
    + ret = show_one_line(fp, l - lr->offset);
    if (ret < 0)
    goto end;
    }
    - ret = show_one_line(fp, l++ - lr->offset, false, true);
    + ret = show_one_line_with_num(fp, l++ - lr->offset);
    if (ret < 0)
    goto end;
    }

    if (lr->end == INT_MAX)
    lr->end = l + NR_ADDITIONAL_LINES;
    - while (l <= lr->end && !feof(fp)) {
    - ret = show_one_line(fp, l++ - lr->offset, false, false);
    - if (ret < 0)
    + while (l <= lr->end) {
    + ret = show_one_line_or_eof(fp, l++ - lr->offset);
    + if (ret <= 0)
    break;
    }
    end:

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