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void fatal_error(const char* msg, ...) {
va_list args;
va_start(args, msg);
vfprintf(stderr, msg, args);
va_end(args);
fprintf(stderr, "\n");
exit(1);
}
#define unreachable() fatal_error("%s:%d: unreachable", __FILE__, __LINE__)
#define unimplemented() fatal_error("%s:%d: unimplemented", __FILE__, __LINE__)
struct StrBuilder {
size_t len;
size_t capacity;
char* buf;
};
typedef struct StrBuilder StrBuilder;
void strbuilder_init(StrBuilder* b) {
b->len = 0;
b->capacity = 16;
b->buf = calloc(b->capacity, sizeof(char));
}
// `size` must include a trailing null byte.
void strbuilder_reserve(StrBuilder* b, size_t size) {
if (size <= b->capacity)
return;
b->capacity *= 2;
b->buf = realloc(b->buf, b->capacity * sizeof(char));
memset(b->buf + b->len, 0, (b->capacity - b->len) * sizeof(char));
}
void strbuilder_append_char(StrBuilder* b, int c) {
strbuilder_reserve(b, b->len + 1 + 1);
b->buf[b->len++] = c;
}
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