diff --git a/backend/code.c b/backend/code.c
index 5c3bb845..81bcde9b 100644
--- a/backend/code.c
+++ b/backend/code.c
@@ -380,7 +380,7 @@ INTERNAL int pharmazentral(struct zint_symbol *symbol, unsigned char source[], i
     check_digit = count % 11;
 
     if (symbol->debug & ZINT_DEBUG_PRINT) {
-        printf("PZN: %s, check digit %d\n", localstr, check_digit);
+        printf("PZN: %s, check digit %d\n", localstr, (int) check_digit);
     }
 
     if (check_digit == 10) {
diff --git a/backend/code1.c b/backend/code1.c
index 245f53d6..478ffdde 100644
--- a/backend/code1.c
+++ b/backend/code1.c
@@ -910,7 +910,7 @@ static int c1_encode(struct zint_symbol *symbol, unsigned char source[], unsigne
     if (debug_print) {
         printf("Target (%d):", tp);
         for (i = 0; i < tp; i++) {
-            printf(" [%d]", target[i]);
+            printf(" [%d]", (int) target[i]);
         }
         printf("\nLast Mode: %d\n", *p_last_mode);
     }
@@ -999,7 +999,7 @@ INTERNAL int code_one(struct zint_symbol *symbol, unsigned char source[], int le
 
         if (symbol->debug & ZINT_DEBUG_PRINT) {
             printf("Codewords (%d): ", codewords);
-            for (i = 0; i < codewords * 2; i++) printf(" %d", data[i]);
+            for (i = 0; i < codewords * 2; i++) printf(" %d", (int) data[i]);
             printf("\n");
         }
 
@@ -1087,7 +1087,7 @@ INTERNAL int code_one(struct zint_symbol *symbol, unsigned char source[], int le
 
         if (symbol->debug & ZINT_DEBUG_PRINT) {
             printf("Codewords (%d):", data_cw + ecc_cw);
-            for (i = 0; i < data_cw + ecc_cw; i++) printf(" %d", data[i]);
+            for (i = 0; i < data_cw + ecc_cw; i++) printf(" %d", (int) data[i]);
             printf("\n");
         }
 
@@ -1177,7 +1177,7 @@ INTERNAL int code_one(struct zint_symbol *symbol, unsigned char source[], int le
 
         if (symbol->debug & ZINT_DEBUG_PRINT) {
             printf("Codewords (%d):", data_cw + ecc_length);
-            for (i = 0; i < data_cw + ecc_length; i++) printf(" %d", data[i]);
+            for (i = 0; i < data_cw + ecc_length; i++) printf(" %d", (int) data[i]);
             printf("\n");
         }
 
diff --git a/backend/code128.c b/backend/code128.c
index c21103e5..11fc06a8 100644
--- a/backend/code128.c
+++ b/backend/code128.c
@@ -236,15 +236,18 @@ static void c128_set_a(const unsigned char source, char dest[], int values[], in
  * This set handles all characters which are not part of long numbers and not
  * control characters.
  */
-static void c128_set_b(const unsigned char source, char dest[], int values[], int *bar_chars) {
-    if (source > 127) {
+static int c128_set_b(const unsigned char source, char dest[], int values[], int *bar_chars) {
+    if (source > 127 + 32) { /* Suppress cppcheck out-of-bounds warning with + 32 check */
         strcat(dest, C128Table[source - 32 - 128]);
         values[(*bar_chars)] = source - 32 - 128;
-    } else {
+    } else if (source <= 127) { /* Suppress cppcheck out-of-bounds warning with <= 127 check */
         strcat(dest, C128Table[source - 32]);
         values[(*bar_chars)] = source - 32;
+    } else { /* Should never happen */
+        return 0; /* Not reached */
     }
     (*bar_chars)++;
+    return 1;
 }
 
 /* Translate Code 128 Set C characters into barcodes
@@ -651,7 +654,7 @@ INTERNAL int code_128(struct zint_symbol *symbol, unsigned char source[], int le
                 read++;
                 break;
             case 'b':
-            case 'B': c128_set_b(source[read], dest, values, &bar_characters);
+            case 'B': (void) c128_set_b(source[read], dest, values, &bar_characters);
                 read++;
                 break;
             case 'C': c128_set_c(source[read], source[read + 1], dest, values, &bar_characters);
@@ -919,7 +922,7 @@ INTERNAL int ean_128_cc(struct zint_symbol *symbol, unsigned char source[], int
                     break;
                 case 'B':
                 case 'b':
-                    c128_set_b(reduced[read], dest, values, &bar_characters);
+                    (void) c128_set_b(reduced[read], dest, values, &bar_characters);
                     read++;
                     break;
                 case 'C':
diff --git a/backend/gridmtx.c b/backend/gridmtx.c
index ef701487..6e340552 100644
--- a/backend/gridmtx.c
+++ b/backend/gridmtx.c
@@ -543,7 +543,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
                 }
 
                 if (debug & ZINT_DEBUG_PRINT) {
-                    printf("[%d] ", glyph);
+                    printf("[%d] ", (int) glyph);
                 }
 
                 bp = bin_append_posn(glyph, 13, binary, bp);
@@ -608,7 +608,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
                     glyph += 1000;
 
                     if (debug & ZINT_DEBUG_PRINT) {
-                        printf("[%d] ", glyph);
+                        printf("[%d] ", (int) glyph);
                     }
 
                     bp = bin_append_posn(glyph, 10, binary, bp);
@@ -616,7 +616,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
 
                 glyph = (100 * (numbuf[0] - '0')) + (10 * (numbuf[1] - '0')) + (numbuf[2] - '0');
                 if (debug & ZINT_DEBUG_PRINT) {
-                    printf("[%d] ", glyph);
+                    printf("[%d] ", (int) glyph);
                 }
 
                 bp = bin_append_posn(glyph, 10, binary, bp);
@@ -644,7 +644,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
                 }
 
                 if (debug & ZINT_DEBUG_PRINT) {
-                    printf("[%d] ", glyph);
+                    printf("[%d] ", (int) glyph);
                 }
                 bp = bin_append_posn(glyph, glyph > 0xFF ? 16 : 8, binary, bp);
                 sp++;
@@ -670,7 +670,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
                     /* Mixed Mode character */
                     glyph = posn(EUROPIUM, (const char) gbdata[sp]);
                     if (debug & ZINT_DEBUG_PRINT) {
-                        printf("[%d] ", glyph);
+                        printf("[%d] ", (int) glyph);
                     }
 
                     bp = bin_append_posn(glyph, 6, binary, bp);
@@ -695,7 +695,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
                     /* Upper Case character */
                     glyph = posn("ABCDEFGHIJKLMNOPQRSTUVWXYZ ", (const char) gbdata[sp]);
                     if (debug & ZINT_DEBUG_PRINT) {
-                        printf("[%d] ", glyph);
+                        printf("[%d] ", (int) glyph);
                     }
 
                     bp = bin_append_posn(glyph, 5, binary, bp);
@@ -720,7 +720,7 @@ static int gm_encode(unsigned int gbdata[], const int length, char binary[], con
                     /* Lower Case character */
                     glyph = posn("abcdefghijklmnopqrstuvwxyz ", (const char) gbdata[sp]);
                     if (debug & ZINT_DEBUG_PRINT) {
-                        printf("[%d] ", glyph);
+                        printf("[%d] ", (int) glyph);
                     }
 
                     bp = bin_append_posn(glyph, 5, binary, bp);
diff --git a/backend/hanxin.c b/backend/hanxin.c
index f2731a1c..90ed91f0 100644
--- a/backend/hanxin.c
+++ b/backend/hanxin.c
@@ -643,7 +643,7 @@ static void calculate_binary(char binary[], const char mode[], unsigned int sour
                     bp = bin_append_posn(source[i + position], source[i + position] > 0xFF ? 16 : 8, binary, bp);
 
                     if (debug & ZINT_DEBUG_PRINT) {
-                        printf("%d ", source[i + position]);
+                        printf("%d ", (int) source[i + position]);
                     }
 
                     i++;
@@ -862,7 +862,8 @@ static void hx_place_finder(unsigned char *grid, const int size, const int x, co
 /* Finder pattern for bottom right of symbol */
 static void hx_place_finder_bottom_right(unsigned char *grid, const int size) {
     int xp, yp;
-    int x = size - 7, y = size - 7;
+    int x = size - 7;
+    int y = x;
     char finder[] = {0x75, 0x75, 0x75, 0x05, 0x7D, 0x01, 0x7F};
 
     for (xp = 0; xp < 7; xp++) {
@@ -1186,10 +1187,8 @@ static void make_picket_fence(const unsigned char fullstream[], unsigned char pi
 
     for (start = 0; start < 13; start++) {
         for (i = start; i < streamsize; i += 13) {
-            if (i < streamsize) {
-                picket_fence[output_position] = fullstream[i];
-                output_position++;
-            }
+            picket_fence[output_position] = fullstream[i];
+            output_position++;
         }
     }
 }
diff --git a/backend/tests/test_big5.c b/backend/tests/test_big5.c
index 46683b06..186792e9 100644
--- a/backend/tests/test_big5.c
+++ b/backend/tests/test_big5.c
@@ -66,9 +66,9 @@ static void test_big5_wctomb_zint(void) {
         val = val2 = 0;
         ret = big5_wctomb_zint(&val, i);
         ret2 = big5_wctomb_zint2(&val2, i);
-        assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", i, i, ret, ret2, val, val2);
+        assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", (int) i, i, ret, ret2, val, val2);
         if (ret2) {
-            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", i, i, val, val2);
+            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", (int) i, i, val, val2);
         }
     }
 
diff --git a/backend/tests/test_gb2312.c b/backend/tests/test_gb2312.c
index 0118c159..12b367bb 100644
--- a/backend/tests/test_gb2312.c
+++ b/backend/tests/test_gb2312.c
@@ -74,18 +74,18 @@ static void test_gb2312_wctomb_zint(void) {
         ret = gb2312_wctomb_zint(&val, i);
         ret2 = gb2312_wctomb_zint2(&val2, i);
         if (i == 0xB7) { // Extra mapping middle dot U+00B7 to 0xA1A4, duplicate of U+30FB (Katakana middle dot)
-            assert_equal(ret, 2, "i:%d 0x%04X ret %d != 2, val 0x%04X\n", i, i, ret, val);
-            assert_equal(val, 0xA1A4, "i:%d 0x%04X val 0x%04X != 0xA1A4\n", i, i, val);
-            assert_zero(ret2, "i:%d 0x%04X ret2 %d != 0, val2 0x%04X\n", i, i, ret2, val2);
+            assert_equal(ret, 2, "i:%d 0x%04X ret %d != 2, val 0x%04X\n", (int) i, i, ret, val);
+            assert_equal(val, 0xA1A4, "i:%d 0x%04X val 0x%04X != 0xA1A4\n", (int) i, i, val);
+            assert_zero(ret2, "i:%d 0x%04X ret2 %d != 0, val2 0x%04X\n", (int) i, i, ret2, val2);
         } else if (i == 0x2014) { // Extra mapping em dash U+2014 to 0xA1AA, duplicate of U+2015 (horizontal bar)
-            assert_equal(ret, 2, "i:%d 0x%04X ret %d != 2, val 0x%04X\n", i, i, ret, val);
-            assert_equal(val, 0xA1AA, "i:%d 0x%04X val 0x%04X != 0xA1AA\n", i, i, val);
-            assert_zero(ret2, "i:%d 0x%04X ret2 %d != 0, val2 0x%04X\n", i, i, ret2, val2);
+            assert_equal(ret, 2, "i:%d 0x%04X ret %d != 2, val 0x%04X\n", (int) i, i, ret, val);
+            assert_equal(val, 0xA1AA, "i:%d 0x%04X val 0x%04X != 0xA1AA\n", (int) i, i, val);
+            assert_zero(ret2, "i:%d 0x%04X ret2 %d != 0, val2 0x%04X\n", (int) i, i, ret2, val2);
         } else {
-            assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", i, i, ret, ret2, val, val2);
+            assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", (int) i, i, ret, ret2, val, val2);
         }
         if (ret2) {
-            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", i, i, val, val2);
+            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", (int) i, i, val, val2);
         }
     }
 
diff --git a/backend/tests/test_ksx1001.c b/backend/tests/test_ksx1001.c
index 1fecd675..5c767714 100644
--- a/backend/tests/test_ksx1001.c
+++ b/backend/tests/test_ksx1001.c
@@ -80,9 +80,9 @@ static void test_ksx1001_wctomb_zint(void) {
         val = val2 = 0;
         ret = ksx1001_wctomb_zint(&val, i);
         ret2 = ksx1001_wctomb_zint2(&val2, i);
-        assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", i, i, ret, ret2, val, val2);
+        assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", (int) i, i, ret, ret2, val, val2);
         if (ret2) {
-            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", i, i, val, val2);
+            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", (int) i, i, val, val2);
         }
     }
 
diff --git a/backend/tests/test_library.c b/backend/tests/test_library.c
index c397f140..63c3bdce 100644
--- a/backend/tests/test_library.c
+++ b/backend/tests/test_library.c
@@ -847,7 +847,7 @@ static void test_clear(void) {
 
     assert_nonzero(symbol->rows, "ZBarcode_Buffer() rows 0\n");
     assert_nonzero(symbol->width, "ZBarcode_Buffer() width 0\n");
-    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer() bitmap_byte_length %d != 0\n", symbol->bitmap_byte_length);
+    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer() bitmap_byte_length %d != 0\n", (int) symbol->bitmap_byte_length);
     assert_null(symbol->vector, "ZBarcode_Buffer() vector != NULL\n");
 
     ZBarcode_Clear(symbol);
@@ -859,7 +859,7 @@ static void test_clear(void) {
 
     assert_zero(symbol->rows, "ZBarcode_Buffer() rows %d != 0\n", symbol->rows);
     assert_zero(symbol->width, "ZBarcode_Buffer() width %d != 0\n", symbol->width);
-    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer() bitmap_byte_length %d != 0\n", symbol->bitmap_byte_length);
+    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer() bitmap_byte_length %d != 0\n", (int) symbol->bitmap_byte_length);
     assert_null(symbol->vector, "ZBarcode_Buffer() vector != NULL\n");
 
     // Vector
@@ -883,7 +883,7 @@ static void test_clear(void) {
     assert_nonzero(symbol->width, "ZBarcode_Buffer_Vector() width 0\n");
     assert_null(symbol->bitmap, "ZBarcode_Buffer_Vector() bitmap != NULL\n");
     assert_null(symbol->alphamap, "ZBarcode_Buffer_Vector() alphamap != NULL\n");
-    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer_Vector() bitmap_byte_length %d != 0\n", symbol->bitmap_byte_length);
+    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer_Vector() bitmap_byte_length %d != 0\n", (int) symbol->bitmap_byte_length);
 
     ZBarcode_Clear(symbol);
 
@@ -891,7 +891,7 @@ static void test_clear(void) {
 
     assert_zero(symbol->rows, "ZBarcode_Buffer_Vector() rows %d != 0\n", symbol->rows);
     assert_zero(symbol->width, "ZBarcode_Buffer_Vector() width %d != 0\n", symbol->width);
-    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer_Vector() bitmap_byte_length %d != 0\n", symbol->bitmap_byte_length);
+    assert_zero(symbol->bitmap_byte_length, "ZBarcode_Buffer_Vector() bitmap_byte_length %d != 0\n", (int) symbol->bitmap_byte_length);
     assert_null(symbol->bitmap, "ZBarcode_Buffer_Vector() bitmap != NULL\n");
     assert_null(symbol->alphamap, "ZBarcode_Buffer_Vector() alphamap != NULL\n");
     assert_zero(symbol->bitmap_width, "ZBarcode_Buffer_Vector() bitmap_width %d != 0\n", symbol->bitmap_width);
diff --git a/backend/tests/test_reedsol.c b/backend/tests/test_reedsol.c
index b5f3d2c9..bce728c7 100644
--- a/backend/tests/test_reedsol.c
+++ b/backend/tests/test_reedsol.c
@@ -207,7 +207,7 @@ static void test_encoding_uint(int index) {
         //fprintf(stderr, "exp "); for (j = 0; j < data[i].nsym; j++) fprintf(stderr, "%d ", data[i].expected[j]); fprintf(stderr, "\n");
         for (j = 0; j < data[i].nsym; j++) {
             int k = data[i].nsym - 1 - j;
-            assert_equal(res[k], data[i].expected[j], "i:%d res[%d] %d != expected[%d] %d\n", i, k, res[k], j, data[i].expected[j]);
+            assert_equal(res[k], data[i].expected[j], "i:%d res[%d] %d != expected[%d] %d\n", i, k, (int) res[k], j, (int) data[i].expected[j]);
         }
     }
 
diff --git a/backend/tests/test_sjis.c b/backend/tests/test_sjis.c
index a018d644..2b6b2926 100644
--- a/backend/tests/test_sjis.c
+++ b/backend/tests/test_sjis.c
@@ -97,14 +97,14 @@ static void test_sjis_wctomb_zint(void) {
         ret = sjis_wctomb_zint(&val, i);
         ret2 = sjis_wctomb_zint2(&val2, i);
         if (i == 0xFF3C) { // Extra mapping full-width reverse solidus U+FF3C to 0x815F, duplicate of U+005C (backslash)
-            assert_equal(ret, 2, "i:%d 0x%04X ret %d != 2, val 0x%04X\n", i, i, ret, val);
-            assert_equal(val, 0x815F, "i:%d 0x%04X val 0x%04X != 0x815F\n", i, i, val);
-            assert_zero(ret2, "i:%d 0x%04X ret2 %d != 0, val2 0x%04X\n", i, i, ret2, val2);
+            assert_equal(ret, 2, "i:%d 0x%04X ret %d != 2, val 0x%04X\n", (int) i, i, ret, val);
+            assert_equal(val, 0x815F, "i:%d 0x%04X val 0x%04X != 0x815F\n", (int) i, i, val);
+            assert_zero(ret2, "i:%d 0x%04X ret2 %d != 0, val2 0x%04X\n", (int) i, i, ret2, val2);
         } else {
-            assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", i, i, ret, ret2, val, val2);
+            assert_equal(ret, ret2, "i:%d 0x%04X ret %d != ret2 %d, val 0x%04X, val2 0x%04X\n", (int) i, i, ret, ret2, val, val2);
         }
         if (ret2) {
-            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", i, i, val, val2);
+            assert_equal(val, val2, "i:%d 0x%04X val 0x%04X != val2 0x%04X\n", (int) i, i, val, val2);
         }
     }
 
diff --git a/backend/tests/testcommon.c b/backend/tests/testcommon.c
index 3ad2ab98..7c6463e6 100644
--- a/backend/tests/testcommon.c
+++ b/backend/tests/testcommon.c
@@ -612,9 +612,9 @@ const char *testUtilOption3Name(int option_3) {
 
     if (high_byte) {
         if (option_3 & 0xFF) {
-            sprintf(buffer, "%s | (%d << 8)", name, high_byte);
+            sprintf(buffer, "%s | (%d << 8)", name, (int) high_byte);
         } else {
-            sprintf(buffer, "%d << 8", high_byte);
+            sprintf(buffer, "%d << 8", (int) high_byte);
         }
         return buffer;
     }