From 9609fded10590ebcc7e91af4da4b19695d416182 Mon Sep 17 00:00:00 2001
From: Mosder <git@mosder.eu>
Date: Tue, 20 Oct 2026 16:37:15 +0200
Subject: fix: fixed some memory related bugs

---
 src/ds/array.c | 10 +++++-----
 src/safe.c     |  2 +-
 src/tester.c   | 23 +++++++++++++----------
 3 files changed, 19 insertions(+), 16 deletions(-)

(limited to 'src')

diff --git a/src/ds/array.c b/src/ds/array.c
index 6a65d49..b36ddf5 100644
--- a/src/ds/array.c
+++ b/src/ds/array.c
@@ -61,7 +61,7 @@ void mos_arr_insert_fn(void *p_arr, size_t i, size_t el_size, size_t init_cap) {
 
 void mos_arr_put_fn(void *p_arr, size_t i, size_t el_size, size_t init_cap) {
     ini(i + 1);
-    if (i > hdr->len) {
+    if (i >= hdr->len) {
         memset((char *)arr + hdr->len * el_size, 0, (i - hdr->len) * el_size);
         hdr->len = i + 1;
     }
@@ -93,14 +93,14 @@ size_t mos_arr_insert_n_fn(
 size_t mos_arr_put_n_fn(
     void *p_arr, size_t i, const void *items, size_t n, size_t el_size, size_t init_cap
 ) {
-    ini(i + n + 1);
+    ini(i + n);
     if (i > hdr->len) {
         memset((char *)arr + hdr->len * el_size, 0, (i - hdr->len) * el_size);
     }
 
     memmove((char *)arr + i * el_size, items, n * el_size);
-    if (i + n + 1 > hdr->len)
-        hdr->len = i + n + 1;
+    if (i + n > hdr->len)
+        hdr->len = i + n;
     return i;
 }
 
@@ -125,10 +125,10 @@ size_t mos_arr_del_n_fn(void *arr, size_t i, size_t n, size_t el_size) {
         return 0;
 
     size_t new_n = n > hdr->len - i ? hdr->len - i : n;
+    hdr->len -= new_n;
     memmove(
         (char *)arr + i * el_size, (char *)arr + (i + new_n) * el_size, (hdr->len - i) * el_size
     );
-    hdr->len -= new_n;
     return new_n;
 }
 
diff --git a/src/safe.c b/src/safe.c
index e72dbff..a6cb4b1 100644
--- a/src/safe.c
+++ b/src/safe.c
@@ -40,7 +40,7 @@ void *mos_safe_calloc_fn(size_t count, size_t size, MosSafeErrInfo info) {
 
 void *mos_safe_realloc_fn(void *ptr, size_t size, MosSafeErrInfo info) {
     void *p = realloc(ptr, size);
-    if (p)
+    if (p || (!p && size == 0))
         return p;
     ERR_MESS("failed to realloc %p to %zu bytes", ptr, size);
     exit(EXIT_FAILURE);
diff --git a/src/tester.c b/src/tester.c
index 7723e97..06a938f 100644
--- a/src/tester.c
+++ b/src/tester.c
@@ -53,16 +53,19 @@ static Outputs suppressed = {
 #define nl printf("\n")
 
 static void print_center(const char *text, int color, char padding_char) {
-    size_t post_char_count = (RENDER_WIDTH - strlen(text)) / 2;
-    size_t pre_char_count = RENDER_WIDTH - post_char_count - strlen(text);
-
-    for (size_t i = 1; i < pre_char_count; i++)
-        printf("%c", padding_char);
-
-    print_color(color, " %s ", text);
-
-    for (size_t i = 1; i < post_char_count; i++)
-        printf("%c", padding_char);
+    size_t len = strlen(text);
+    if (len + 2 > RENDER_WIDTH) {
+        print_color(color, "%s", text);
+    }
+    else {
+        size_t post_char_count = (RENDER_WIDTH - len) / 2;
+        size_t pre_char_count = RENDER_WIDTH - post_char_count - len;
+        for (size_t i = 1; i < pre_char_count; i++)
+            printf("%c", padding_char);
+        print_color(color, " %s ", text);
+        for (size_t i = 1; i < post_char_count; i++)
+            printf("%c", padding_char);
+    }
 
     nl;
 }
-- 
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