c - 如何根据传递给脚本的参数在 c 中创建无符号整数数组？

Question

我需要创建一个无符号整数数组，例如

char** str_split(char* a_str, const char a_delim)
{
char** result    = 0;
size_t count     = 0;
char* tmp        = a_str;
char* last_comma = 0;
char delim[2];
delim[0] = a_delim;
delim[1] = 0;

/* Count how many elements will be extracted. */
while (*tmp)
{
    if (a_delim == *tmp)
    {
        count++;
        last_comma = tmp;
    }
    tmp++;
}

/* Add space for trailing token. */
count += last_comma < (a_str + strlen(a_str) - 1);

/* Add space for terminating null string so caller
   knows where the list of returned strings ends. */
count++;

result = malloc(sizeof(char*) * count);

if (result)
{
    size_t idx  = 0;
    char* token = strtok(a_str, delim);

    while (token)
    {
        assert(idx < count);
        *(result + idx++) = strdup(token);
        token = strtok(0, delim);
    }
    assert(idx == count - 1);
    *(result + idx) = 0;
}

return result;

}

uint8_t in[] = {0X08,0X3c,0Xe6,0Xe3,0Xb9,0X74,0X4a,0Xdc,0Xd7,0X29,0Xee,0X99,0X35,0X15,0X8a,0X77}; 

来自传递给脚本的参数。参数将被传递给脚本，如

./conversion 0X08,0X3c,0Xe6,0Xe3,0Xb9,0X74,0X4a,0Xdc,0Xd7,0X29,0Xee,0X99,0X35,0X15,0X8a,0X77

我创建了以下代码来从参数创建数组

char** tokens;
tokens = str_split(argv[1], ',');
uint8_t hex[100];
uint8_t in[100];

if (tokens)
{
    int i;
    for (i = 0; *(tokens + i); i++)
    {
            printf("val=[%s]\n", *(tokens + i));

          in[i] = *(tokens + i);

        free(*(tokens + i));
    }
    printf("\n");
    free(tokens);
}

for (i = 0; i < 16;i++) 
 printf("%02x ",in[i]);

执行脚本时收到以下警告

warning: assignment makes integer from pointer without a cast

但是我可以使用

打印出每个值

printf("val=[%s]\n", *(tokens + i))

但无法将其保存为数组，例如

我的代码有什么问题吗？你能帮我吗？

Answer 1

请记住，tokens 是指针到指针类型，char **tokens。因此*(tokens+i)是一个指针。您将该指针(指向字符串)视为整数。

您需要做的就是首先将字符串转换为整数类型。 strtoul() 是一个很好的起点。您甚至可以指定您的基数，以便它自动为您从十六进制转换。

for (i = 0; tokens[i]; i++)
{
    char *endptr;
    unsigned long tmp;
    printf("val=[%s]\n", tokens[i]);
    tmp = strtoul(tokens[i], &endptr, 16);
    if (endptr == tokens[i]) {
        /* end of valid number is the beginning of the string */
        /* that means there was no valid number */
        /* insert error handling here (e.g. reprinting usage) */
        in[i] = (uint8_t)0;
    } else {
        in[i] = (uint8_t)tmp;
    }
    free(tokens[i]);
}