121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
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/*
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Usage:
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// We need to use macro const_string to convert literal to string
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string fmt = const_string("Pointer address: 0x%x");
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print(fmt, cast(u64)&a); // Print to stdout
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// Format a string and allocate with context.allocator
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string a = sprint("Hello, %cs!\n", "balls"); // %cs for char*
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string balls = const_string("balls");
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// tprint for temporary allocation
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string b = tprint(const_string("Hello, %s!\n"), balls); // %s for string
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// Allocate a new string of length 12 (with context allocator)
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string c = alloc_string(12);
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dealloc_string(c);
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// We can use raw char* for format with printf/sprintf/tprintf
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printf("Hello, %!\n", balls);
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// concatenation
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string concatenated = string_concat(a, b);
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// Use temporary memory to make a null-terminated copy of fixed-length string
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char* cstring = temp_convert_to_null_terminated_string(balls);
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// To convert a cstring to string (using same memory)
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string s;
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s.data = (u8*)cstring;
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s.count = strlen(cstring);
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// String matching
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bool match = strings_match(a, b);
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// View into "Hello, balls!\n" from index 7 with a count of 5; "balls"
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string balls2 = string_view(a, 7, 5);
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*/
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void * memcpy (void *,const void *,size_t);
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void* talloc(u64);
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typedef struct string {
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u64 count;
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u8 *data;
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} string;
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void push_temp_allocator();
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// Not sure what to call this lol
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#define fixed_string const_string
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#define cstr const_string
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#define const_string(s) ((string){ length_of_null_terminated_string(s), (u8*)s })
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inline u64 length_of_null_terminated_string(const char* cstring) {
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u64 len = 0;
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while (*cstring != 0) {
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len += 1;
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cstring += 1;
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}
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return len;
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}
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string alloc_string(u64 count) {
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string s;
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s.count = count;
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s.data = cast(u8*)alloc(count);
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return s;
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}
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void dealloc_string(string s) {
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dealloc(s.data);
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}
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// context.allocator !
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string string_concat(const string left, const string right) {
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string result;
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result.count = left.count + right.count;
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result.data = cast(u8*)alloc(result.count);
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memcpy(result.data, left.data, left.count);
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memcpy(result.data+left.count, right.data, right.count);
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return result;
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}
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// context.allocator !
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char *convert_to_null_terminated_string(const string s) {
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char *cstring = cast(char*)alloc(s.count+1);
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memcpy(cstring, s.data, s.count);
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cstring[s.count] = 0;
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return cstring;
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}
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char *temp_convert_to_null_terminated_string(const string s) {
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push_temp_allocator();
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char *c = convert_to_null_terminated_string(s);
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pop_allocator();
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return c;
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}
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bool strings_match(string a, string b) {
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if (a.count != b.count) return false;
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// Count match, pointer match: they are the same
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if (a.data == b.data) return true;
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return memcmp(a.data, b.data, a.count) == 0;
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}
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string string_view(string s, u64 start_index, u64 count) {
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assert(start_index < s.count, "array_view start_index % out of range for string count %", start_index, s.count);
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assert(count > 0, "array_view count must be more than 0");
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assert(start_index + count <= s.count, "array_view start_index + count is out of range");
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string result;
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result.data = s.data+start_index;
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result.count = count;
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return result;
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}
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