mirror of https://github.com/bjornbytes/lovr.git
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
#include "util.h"
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#include <stdlib.h>
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#include <stdatomic.h>
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// Error handling
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static LOVR_THREAD_LOCAL errorFn* lovrErrorCallback;
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static LOVR_THREAD_LOCAL void* lovrErrorUserdata;
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void lovrSetErrorCallback(errorFn* callback, void* userdata) {
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lovrErrorCallback = callback;
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lovrErrorUserdata = userdata;
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}
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void lovrThrow(const char* format, ...) {
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va_list args;
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va_start(args, format);
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lovrErrorCallback(lovrErrorUserdata, format, args);
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va_end(args);
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exit(EXIT_FAILURE);
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}
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// Logging
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logFn* lovrLogCallback;
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void* lovrLogUserdata;
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void lovrSetLogCallback(logFn* callback, void* userdata) {
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lovrLogCallback = callback;
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lovrLogUserdata = userdata;
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}
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void lovrLog(int level, const char* tag, const char* format, ...) {
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va_list args;
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va_start(args, format);
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lovrLogCallback(lovrLogUserdata, level, tag, format, args);
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va_end(args);
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}
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// Refcounting
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#if ATOMIC_INT_LOCK_FREE != 2
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#error "Lock-free integer atomics are not supported on this platform, but are required for refcounting"
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#endif
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void lovrRetain(void* object) {
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if (object) {
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atomic_fetch_add((atomic_uint*) object, 1);
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}
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}
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void lovrRelease(void* object, void (*destructor)(void*)) {
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if (object && atomic_fetch_sub((atomic_uint*) object, 1) == 1) {
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destructor(object);
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}
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}
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// Dynamic Array
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// Default malloc-based allocator for arr_t (like realloc except well-defined when size is 0)
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void* arr_alloc(void* data, size_t size) {
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if (size > 0) {
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return realloc(data, size);
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} else {
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free(data);
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return NULL;
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}
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}
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// UTF-8
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// https://github.com/starwing/luautf8
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size_t utf8_decode(const char *s, const char *e, unsigned *pch) {
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unsigned ch;
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if (s >= e) {
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*pch = 0;
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return 0;
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}
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ch = (unsigned char)s[0];
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if (ch < 0xC0) goto fallback;
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if (ch < 0xE0) {
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if (s+1 >= e || (s[1] & 0xC0) != 0x80)
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goto fallback;
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*pch = ((ch & 0x1F) << 6) |
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(s[1] & 0x3F);
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return 2;
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}
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if (ch < 0xF0) {
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if (s+2 >= e || (s[1] & 0xC0) != 0x80
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|| (s[2] & 0xC0) != 0x80)
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goto fallback;
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*pch = ((ch & 0x0F) << 12) |
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((s[1] & 0x3F) << 6) |
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(s[2] & 0x3F);
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return 3;
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}
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{
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int count = 0; /* to count number of continuation bytes */
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unsigned res = 0;
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while ((ch & 0x40) != 0) { /* still have continuation bytes? */
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int cc = (unsigned char)s[++count];
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if ((cc & 0xC0) != 0x80) /* not a continuation byte? */
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goto fallback; /* invalid byte sequence, fallback */
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res = (res << 6) | (cc & 0x3F); /* add lower 6 bits from cont. byte */
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ch <<= 1; /* to test next bit */
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}
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if (count > 5)
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goto fallback; /* invalid byte sequence */
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res |= ((ch & 0x7F) << (count * 5)); /* add first byte */
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*pch = res;
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return count+1;
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}
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fallback:
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*pch = ch;
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return 1;
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}
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void utf8_encode(uint32_t c, char s[4]) {
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if (c <= 0x7f) {
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s[0] = c;
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} else if (c <= 0x7ff) {
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s[0] = (0xc0 | ((c >> 6) & 0x1f));
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s[1] = (0x80 | (c & 0x3f));
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} else if (c <= 0xffff) {
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s[0] = (0xe0 | ((c >> 12) & 0x0f));
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s[1] = (0x80 | ((c >> 6) & 0x3f));
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s[2] = (0x80 | (c & 0x3f));
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} else if (c <= 0x10ffff) {
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s[1] = (0xf0 | ((c >> 18) & 0x07));
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s[1] = (0x80 | ((c >> 12) & 0x3f));
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s[2] = (0x80 | ((c >> 6) & 0x3f));
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s[3] = (0x80 | (c & 0x3f));
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}
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}
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