How do you fix errors about the getline function

[goldfishgggg]

implicit declaration of function 'getline'; did you mean 'getenv'? [-Wimplicit-function-declaration]gcc

[Mark-Walen]

implicit declaration of function 'getline'; did you mean 'getenv'? [-Wimplicit-function-declaration]gcc

"I encountered this issue on Windows 10 and found that this function may not work on Windows. So, I tried running the same code under WSL and it worked successfully.

[wtyfpc]

You can try to implement this function by yourself on windows.
`ssize_t getline(char **linep, size_t *n, FILE *fp)
{
int ch;
size_t i = 0;
if (!linep || !n || !fp)
{
return -1;
}
if (*linep == NULL)
{
if (NULL == (*linep = malloc(*n = 128)))
{
*n = 0;
return -1;
}
}

while ((ch = fgetc(fp)) != EOF)
{
    if (ch == '\n')
        break;
    if (i + 1 >= *n)
    {
        char *temp = realloc(*linep, *n + 128);
        if (!temp)
        {
            return -1;
        }
        *n += 128;
        *linep = temp;
    }
    (*linep)[i++] = ch;
}
(*linep)[i] = '\0';

return !i && ch == EOF ? -1 : i;

}`

[Illusionna]

You can rewrite getline function. It is not a standard C package.

ssize_t bs = GetTerminalLine(&(input_buffer->buffer), &(input_buffer->buffer_length), stdin);

ssize_t GetTerminalLine(char **line, size_t *n, FILE *stream) {
    size_t position = 0;
    int character;

    // 初始化缓冲区大小.
    if (*line == NULL || *n == 0) {
        *n = 128;
        *line = (char *)malloc(*n * sizeof(char));
        // 动态分配内存失败, 直接退出.
        if (*line == NULL) {
            return -1;
        }
    }

    while ((character = fgetc(stream)) != EOF) {
        // 如果缓冲区已满, 则扩容 50%.
        if (position + 1 >= *n) {
            size_t m = *n + (*n >> 1);
            char *tmp = (char *)realloc(*line, m);
            if (tmp == NULL) {
                return -1;
            }
            *line = tmp;
            *n = m;
        }

        (*line)[position++] = (char)character;
        if (character == '\n') {
            break;
        }
    }

    if (position == 0 && character == EOF) {
        return -1;
    }

    (*line)[position] = '\0';
    return position;
}