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#define _XOPEN_SOURCE 600
#include "util.h"
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <wctype.h>
int
strnwidth(const char *s, int n)
{
mbstate_t shift_state;
wchar_t wc;
size_t wc_len;
size_t width = 0;
memset(&shift_state, '\0', sizeof shift_state);
for (size_t i = 0; i < n; i += wc_len) {
wc_len = mbrtowc(&wc, s + i, MB_CUR_MAX, &shift_state);
if (!wc_len) {
break;
} else if (wc_len >= (size_t)-2) {
width += MIN(n - 1, strlen(s + i));
break;
} else {
width += iswcntrl(wc) ? 2 : MAX(0, wcwidth(wc));
}
}
done:
return width;
}
void
assert(int cond, const char *file, int line, const char *condstr)
{
if (cond) return;
fprintf(stderr, "Assertion failed %s:%i (%s)", file, line, condstr);
exit(1);
}
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