cleanup const qualifiers. Add index argument to vec_push

src/crypto.c

@@ -45,7 +45,7 @@ static int resize_b64_buf(b64_buf *b, size_t sz) {
     return 0;
 }
 
-const char *b64_encode(const unsigned char *s, size_t sz) {
+char *b64_encode(const unsigned char *s, size_t sz) {
     int i = 0;
     b64_buf encbuf;
     size_t size = 0;
@@ -236,7 +236,7 @@ unsigned char *hex_decode(const char *orig, size_t *sz) {
     return hex;
 }
 
-const char *hex_encode(const unsigned char *hex, size_t sz) {
+char *hex_encode(const unsigned char *hex, size_t sz) {
     size_t ssz = sz * 2 + 1;
     char *s = malloc(sizeof(char) * ssz);
     char *pos = s;
@@ -250,7 +250,7 @@ const char *hex_encode(const unsigned char *hex, size_t sz) {
     return s;
 }
 
-const char *hex_to_str(const unsigned char *hex, size_t sz) {
+char *hex_to_str(const unsigned char *hex, size_t sz) {
     char *s = malloc(sizeof(char) * (sz + 1));
     for (size_t i = 0; i < sz; ++i) {
         s[i] = (char)hex[i];
@@ -259,7 +259,7 @@ const char *hex_to_str(const unsigned char *hex, size_t sz) {
     return s;
 }
 
-const unsigned char* repeating_key_xor(const unsigned char* s, size_t s_sz, const unsigned char* key, size_t k_sz) {
+unsigned char* repeating_key_xor(const unsigned char* s, size_t s_sz, const unsigned char* key, size_t k_sz) {
     unsigned char* r = malloc(sizeof(unsigned char) * s_sz);
     for (size_t i = 0, j = 0; i < s_sz; ++i) {
         r[i] = s[i] ^ key[j];
@@ -268,7 +268,7 @@ const unsigned char* repeating_key_xor(const unsigned char* s, size_t s_sz, cons
     return r;
 }
 
-const unsigned char *repeating_key_xor_s(const char* s, const char* key) {
+unsigned char *repeating_key_xor_s(const char* s, const char* key) {
     return repeating_key_xor((unsigned char*)s, strlen(s), (unsigned char*)key, strlen(key));
 }
 

src/memory.c

@@ -83,7 +83,7 @@ static void *arena_resize_align(ArenaAllocator *allocator, void *mem, const size
         return arena_malloc_align(allocator, new_sz, align);
     }
 
-    if (allocator->buf <= mem && mem < allocator->buf + allocator->buf_sz) {
+    if (allocator->buf <= (unsigned char*)mem && (unsigned char*)mem < allocator->buf + allocator->buf_sz) {
         if (allocator->buf + allocator->offset_prev == old_mem) {
             allocator->offset_cur = allocator->offset_prev + new_sz;
             if (new_sz > old_sz) {

src/string.c

@@ -40,7 +40,7 @@ int find_substrings(const char* haystack, const char* needle, size_t *num_substr
     return 0;
 }
 
-const char* substr(const char* str, size_t idx, size_t len) {
+char* substr(const char* str, size_t idx, size_t len) {
    size_t sz_str = strlen(str);
    if (sz_str < len || idx + len > sz_str) {
        return NULL;

src/vector.c

@@ -81,7 +81,10 @@ int vec_insert(Vector *vec, void *data, size_t index) {
     return 0;
 }
 
-int vec_push(Vector *vec, void *data) {
+int vec_push(Vector *vec, void *data, size_t *index) {
+    if (index != NULL) {
+        *index = vec_len(vec);
+    }
     return vec_insert(vec, data, vec_len(vec));
 }