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#include "util.h"
int
is_numstr(const char *str)
{
int i;
if (!*str) return 0;
for (i = 0; str[i]; i++) {
if (str[i] < '0' || str[i] > '9')
return 0;
}
return 1;
}
char*
randstr(int n)
{
const char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz0123456789";
char *msg;
int i;
srand(time(NULL));
msg = malloc(n + 1);
ASSERT(msg != NULL);
for (i = 0; i < n; i++)
msg[i] = alphabet[rand() % (ARRSIZE(alphabet)-1)];
msg[n] = '\0';
return msg;
}
void
assert(int res, const char *fmtstr, ...)
{
va_list ap;
if (!res) {
va_start(ap, fmtstr);
vfprintf(stderr, fmtstr, ap);
va_end(ap);
exit(1);
}
}
char*
ask(const char *fmtstr, ...)
{
static char buf[2048];
va_list ap;
char *tok;
va_start(ap, fmtstr);
vprintf(fmtstr, ap);
va_end(ap);
if (fgets(buf, ARRSIZE(buf), stdin)) {
tok = strchr(buf, '\n');
if (tok) *tok = '\0';
} else {
*buf = '\0';
}
return buf;
}
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