#define _GNU_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#define Dnew_line 10
int
main(int argc, char *argv[])
{
int fd;
int madret;
int shmid = 0;
const int needle_max = 6;
unsigned long len_max;
unsigned long shmdiff = 0;
char *fileinmemory;
struct stat fd_st;
char needle[needle_max];
if (argc < 3) {
fprintf(stderr, "Onlyfind_str_in: za mamlo danych.\n");
return 1;
}
if (strlen(argv[3]) != needle_max) {
fprintf(stderr, "%sZla dlugośc needle.\n", argv[3]);
return 1;
} else {
strcpy(needle, argv[3]);
}
shmid = atoi(argv[0]);
len_max = strtol(argv[1], NULL, 16);
shmdiff = strtol(argv[2], NULL, 16);
fileinmemory = (char *) shmat(shmid, NULL, 0);
if (*fileinmemory == -1) {
perror("Onlyfind_str_in: shmat.");
return 1;
}
fileinmemory += shmdiff;
int needle_max_minusone = needle_max - 1;
char *endfileinmemory =
fileinmemory + len_max - needle_max + 1;
char *mark = fileinmemory;
char *copymarkstart,
*copymarkstop;
char *needle_maxminus = needle + needle_max_minusone;
char *needle_plus = needle + 1;
unsigned long needle_max_minustwo = needle_max - 2;
unsigned long copylen_max = len_max;
while ((mark = memchr(mark, *needle, copylen_max))
&& (mark < endfileinmemory)) {
if (mark[needle_max_minusone] == *needle_maxminus) {
if (memcmp(++mark, needle_plus, needle_max_minustwo) == 0) {
copymarkstart = mark;
while (*(--copymarkstart) != (char) Dnew_line);
copymarkstop = mark + needle_max;
while (*(++copymarkstop) != (char) Dnew_line);
mark = copymarkstop;
printf("%-.*s", copymarkstop - copymarkstart,
copymarkstart++);
copylen_max = endfileinmemory - mark;
} else {
--copylen_max;
}
} else {
++mark;
--copylen_max;
}
}
return 44;
}
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