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printf ::= #foreign("printf","libc.so.6") fn(#C &"const char", #C ..) #C int;
// NOTE: this doesn't work (e.g. "%%%")
tprintf_valid ::= fn(fmt :: []char, nargs: int) bool {
if fmt[fmt.len-1] != '\0' {
return false;
}
count := 0;
for x, i := fmt {
if x == '%' {
if i == fmt.len-1 {
count += 1;
} elif fmt[i+1] != '%' {
count += 1;
} else {
count -= 1;
}
}
}
count == nargs
};
tprintf ::= fn(fmt :: []char, args: ..) {
#if !tprintf_valid(fmt, args.len) {
#error "Invalid printf format";
}
f := fmt;
printf(&f[0], args);
};
main ::= fn() {
tprintf("%d %d%%\n\0", 3, 4);
tprintf("%d %d %d%%\n\0", 3, 4, 5);
tprintf("Hello!\n\0");
};
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