user/chat.c


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#include "user.h"

void _start(const char* arg, unsigned long arglen)
{
    if (arglen == 0)
    {
        put("usage: run chat <path>\n");
        sys_exit(1);
    }

    char path[128];
    unsigned long i = 0;
    for (; i < arglen && i < sizeof(path) - 1; i++)
        path[i] = arg[i];
    path[i] = 0;

    long fd = sys_open(path, 0);
    if (fd < 0)
    {
        put("chat: ");
        put(path);
        put(": cannot open\n");
        sys_exit(1);
    }

    char buffer[256];
    long bytes_read;
    while ((bytes_read = sys_read(fd, buffer, sizeof(buffer))) > 0)
        (void)sys_write(1, buffer, (unsigned long)bytes_read);
    (void)sys_close(fd);
    sys_exit(0);
}