rushs/evalexpr/check_alphabet/check_alphabet.c


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#include "check_alphabet.h"

#include <stddef.h>

int check_alphabet(const char *str, const char *alphabet)
{
    if (alphabet == NULL || *alphabet == '\0')
    {
        return 1;
    }

    for (int i = 0; alphabet[i]; i++)
    {
        int j;
        for (j = 0; str[j] && str[j] != alphabet[i]; j++)
        {
            continue;
        }
        if (str[j] == '\0')
        {
            return 0;
        }
    }
    return 1;
}