Hello. When trying to run the code below, it displays the following error: Ошибка сегментирования (стек памяти сброшен на диск) Tried to debug via gdb, but the code did not run there either, and gdb produced the following error:
Program received signal SIGSEGV, Segmentation fault. __strcpy_sse2_unaligned () at ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S:298 298 ../sysdeps/x86_64/multiarch/strcpy-sse2-unaligned.S: Нет такого файла или каталога. What to do?
Code:
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <sys/stat.h> #include "hacking.h" // There is the description of "fatal(...)" #define FILENAME "/home/totalboy/notes" int print_notes(int, int, char*); // The function of showing notes int find_user_note(int, int); // Finding in the file for notes of user int search_note(char*, char*); // The function of finding by keywords void fatal(char*); // Handler critical errors int main(int argc, char* argv[]) { int userid, printing = 1, fd; // fd is description of out file char searchstring[100] = { 0 }; if(argv > 1) // If there are arguments strcpy(searchstring, argv[1]); // Then it's the string of finding else searchstring[0] = 0; // Else the string of finding is empty userid = getuid(); fd = open(FILENAME, O_RDONLY); // Opening the file for only reading if(fd == -1) fatal("в функции main() при открытии файла на чтение"); while(printing) printing = print_notes(fd, userid, searchstring); printf("------------[конец данных, касающихся заметки]------------"); close(fd); } // The function of showing notes for certain uid, coinciding with the optional // finding string // In the end of file will be returning 0 // If there are more arguments it will be returning 1 int print_notes(int fd, int uid, char* searchstring) { int note_length = find_user_note(fd, uid); char byte = 0, note_buffer[100] = { 0 }; if(note_length == -1) // If it's the end of the file return 0; // returning 0 read(fd, note_buffer, note_length); // Reading the data of notes note_buffer[note_length] = 0; // The finishing of the string // If the finding string is discovered if(search_note(note_buffer, searchstring)) printf(note_buffer); // Showing it return 1; } // The function of finding the next note for specified userID; // It will be returning 1 with getting the end of the file // In another way it will be returning the length of the discovered note int find_user_note(int fd, int user_uid) { int note_uid = -1; unsigned char byte = NULL; int length = 0; while(note_uid != user_uid) { // While it's not the note for user_uid if(read(fd, ¬e_uid, 4) != 4) // Reading the data of uid return -1; // If 4 bytes aren't read it will be returning the file's end if(read(fd, &byte, 1) != 1) // Reading the symbol of the string's translate return -1; byte = length = 0; while(byte != '\n') { // Defining the bytes' count away from the string's end if(read(fd, &byte, 1) != 1) // Reading the one byte return -1; // If one's not read it will be returning the end of the file length++; } } lseek(fd, length * -1, SEEK_CUR); // Moving the reading position to length bytes printf("[DEBUG] обнаружена заметка длинной %d байтов для id %d\n", length, note_uid); return length; } // The function of finding notes by keyword // It will be returning 1 if it discovered the coincidence // It will be returning 0 in another way int search_note(char* note, char* keyword) { int match = 0; int keyword_length = strlen(keyword); if(keyword_length == 0) // If there is no finding string, return 1; // It always is the coincidence for(int i = 0; i < strlen(note); i++) { // THe note's byte-by-byte view if(note[i] == keyword[match]) // If the bite coincides with the keyword match++; // it prepares to check next byte else { // In another way if(note[i] == keyword[0]) // IF the byte coincides with the first byte of the keyword match = 1; // It starts the calculaction with 1 else match = 0; // In another way it is 0 } if(match == keyword_length) // If there is the full coincidence return 1; // Returning the code 1 } return 0; // Returning the code 0 } 
