From: Pranit Bauva <[email protected]>

Since we want to get rid of git-bisect.sh it would be necessary to
convert those exit() calls to return statements so that errors can be
reported.

Emulate try catch in C by converting `exit(<positive-value>)` to
`return <negetive-value>`. Follow POSIX conventions to return
<negative-value> to indicate error.

Turn `exit()` to `return` calls in `handle_bad_merge_base()`.

Handle/libify this return in dependant methods - `check_merge_bases()`.

Mentored-by: Christian Couder <[email protected]>
Mentored-by: Johannes Schindelin <[email protected]>
Signed-off-by: Pranit Bauva <[email protected]>
Signed-off-by: Tanushree Tumane <[email protected]>
---
 bisect.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/bisect.c b/bisect.c
index 87db1cc4be..b1ea658a75 100644
--- a/bisect.c
+++ b/bisect.c
@@ -751,7 +751,7 @@ static struct commit **get_bad_and_good_commits(int *rev_nr)
        return rev;
 }
 
-static void handle_bad_merge_base(void)
+static int handle_bad_merge_base(void)
 {
        if (is_expected_rev(current_bad_oid)) {
                char *bad_hex = oid_to_hex(current_bad_oid);
@@ -772,14 +772,14 @@ static void handle_bad_merge_base(void)
                                "between %s and [%s].\n"),
                                bad_hex, term_bad, term_good, bad_hex, 
good_hex);
                }
-               exit(3);
+               return -3;
        }
 
        fprintf(stderr, _("Some %s revs are not ancestors of the %s rev.\n"
                "git bisect cannot work properly in this case.\n"
                "Maybe you mistook %s and %s revs?\n"),
                term_good, term_bad, term_good, term_bad);
-       exit(1);
+       return -1;
 }
 
 static void handle_skipped_merge_base(const struct object_id *mb)
@@ -818,7 +818,8 @@ static int check_merge_bases(int rev_nr, struct commit 
**rev, int no_checkout)
        for (; result; result = result->next) {
                const struct object_id *mb = &result->item->object.oid;
                if (oideq(mb, current_bad_oid)) {
-                       handle_bad_merge_base();
+                       res = handle_bad_merge_base();
+                       break;
                } else if (0 <= oid_array_lookup(&good_revs, mb)) {
                        continue;
                } else if (0 <= oid_array_lookup(&skipped_revs, mb)) {
-- 
gitgitgadget

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