int main (int argc, char **argv) {
BUFF *bd;
char line[20], *str;
int num, nmax;
if (argc == 1) nmax = NMAX;
else nmax = atoi (*++argv);
if (!(bd = open_buff (nmax))) {
fprintf (stderr, "Invalid size specified\n");
exit (1);
}
printf ("\n Enter a char to write,"
" o<num> to read num no. of chars, 'exit' to exit\n");
while (1) {
if (buff_full(qd))
printf ("read only: ");
else if (buff_empty(qd))
printf ("write only: ");
else printf ("read/write: ");
if (!fgets (line, 20, stdin)) exit (1);
for (str = line; *str == ' ' || *str == '\t'; str++)
;
if (!strncmp(str, "exit", 4)) {
if (!buff_empty(bd)) printf ("Remaning buffer elements : ");
while (!buff_empty(bd))
printf ("%c ", rd_buff(bd));
printf ("\n===>End of App<===\n");
exit (0);
}
switch (*str) {
case '\n' : continue;
case 'o': case 'O':
if ((num = atoi (str + 1))) {
while (num--) {
if (!buff_empty(bd)) printf ("%c\n", rd_buff(bd));
else {
printf ("Buffer Empty\n");
num = -1;
break;
}
}
if (num == -1) continue;
}
default :
if (wrt_buff (bd, *str))
printf ("Buffer Full. read out items first.\n");
break;
}
}
}
/**
* Stores string from top of global buffer into a given file
*
* @param file path
* @return NULL
*/
void *thread_write_with_mutex (void *params) {
FILE *fp;
char *str;
char *file;
t_thread_parameters *p;
p = (t_thread_parameters *)params;
file = malloc(sizeof(strlen(p->file)));
strcpy(file, p->file);
fp = fopen (file, "w+");
if (fp != NULL) {
while ((gl_buff.quit_flag == 0) || (!buff_empty())) {
usleep (p->sleep_time);
while (buff_empty()) {
printf ("drain thread: no new strings in buffer\n");
}
sem_wait (&lock);
str = buff_read();
if ((strcmp (str, "QUIT")) == 0) {
printf ("drain thread: read [QUIT] from buffer\n");
gl_buff.quit_flag = 1;
}
else {
printf ("drain thread: read from buffer\n");
#ifdef DEBUG
printf ("read '%s' size of %d\n", str, (int) strlen(str));
#endif
fwrite (str, 1, strlen(str), fp);
}
sem_post (&lock);
}
}
fclose (fp);
printf ("drain thread: quitting\n");
return NULL;
}
/**
* Reads most recently inserted string. Decrements counter
*
* @return pointer to newly allocated string. NULL if unsuccessful
*/
char *buff_read() {
char *str;
if (buff_empty()) {
return NULL;
}
str = gl_buff.buff[--gl_buff.buff_size];
#ifdef DEBUG
printf("STRING %s\n", str);
#endif
return str;
}
