fgets.c

Go to the documentation of this file.

#ifndef NULL
#define NULL 0
#endif

extern int getc(int);

char *fgets(char *s, int n, int dev)
{
    int c = 0;
    char *cs;

    cs = s;

    /* Read characters until maximum read length, */
    /*  end of line, or end of file               */
    while ((--n > 0) && ((c = getc(dev)) >= 0))
    {
        *cs++ = c;
        if (('\n' == c) || ('\r' == c))
        {
            break;
        }
    }

    /* Check for EOF or empty string */
    if ((c < 0) && (cs == s))
    {
        return NULL;
    }

    /* Terminate string and return */
    *cs++ = '\0';
    return s;
}