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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <unistd.h>
  4. #include <fcntl.h>
  5. #include <sys/stat.h>
  6. #include "hacking.h"
  7.  
  8. #define FILENAME "/var/notes"
  9.  
  10. int print_notes(int, int, char *);
  11. int find_user_note(int, int);
  12. int search_note(char *, char *);
  13. void fatal(char *);
  14.  
  15. int main(int argc, char *argv[])
  16. {
  17. 	int userid, fd, printing = 1;
  18. 	char searchstring[100];
  19.  
  20. 	if(argc > 1)
  21. 		strcpy(searchstring, argv[1]);
  22. 	else
  23. 		searchstring[0] = 0;
  24.  
  25. 	printf("[DEBUG]: searchstring in main = %s\n", searchstring);
  26.  
  27. 	userid = getuid();
  28. 	fd = open(FILENAME, O_RDONLY);
  29. 	if(fd == -1)
  30. 		fatal("in main() while opening file for reading");
  31. 	while(printing)
  32. 		printing = print_notes(fd, userid, searchstring);
  33. 	printf("-------[end of note data]-------\n");
  34. 	return 0;
  35. }
  36.  
  37.  
  38. int print_notes(int fd, int uid, char *searchstring)
  39. {
  40. 	int note_length;
  41. 	char note_buffer[100];
  42.  
  43. 	note_length = find_user_note(fd, uid);
  44. 	if(note_length == -1)
  45. 		return 0;
  46.  
  47. 	read(fd, note_buffer, note_length);
  48. 	note_buffer[note_length] = 0;
  49.  
  50. 	if(search_note(note_buffer, searchstring))
  51. 		printf(note_buffer);
  52. 	return 1;
  53. }
  54.  
  55. int find_user_note(int fd, int uid)
  56. {
  57. 	int note_uid = -1;
  58. 	int length;
  59. 	unsigned char byte;
  60.  
  61. 	while(note_uid != uid)
  62. 	{
  63. 		if(read(fd, &note_uid, 4) != 4)
  64. 			return -1;
  65. 		if(read(fd, &byte, 1) != 1)
  66. 			return -1;
  67.  
  68. 		byte = length = 0;
  69. 		while(byte != '\n')
  70. 		{
  71. 			if(read(fd, &byte, 1) != 1)
  72. 				return -1;
  73. 			length++;
  74. 		}
  75. 	}
  76. 	lseek(fd, length * -1, SEEK_CUR);
  77.  
  78. 	printf("[DEBUG]: found a %d byte note for user id %d\n", length, uid);
  79. 	return length;
  80. }
  81.  
  82. int search_note(char *note, char *keyword)
  83. {
  84. 	int i, keyword_length, match = 0;
  85.  
  86. 	keyword_length = strlen(keyword);
  87. 	if(keyword_length == 0)
  88. 		return 1;
  89.  
  90. 	for(i = 0; i < strlen(note); i++)
  91. 	{
  92. 		if(note[i] == keyword[match])
  93. 			match++;
  94. 		else{
  95. 			if(note[i] == keyword[0])
  96. 				match = 1;
  97. 			else
  98. 				match = 0;
  99. 		}
  100. 		if(match == keyword_length)
  101. 			return 1;
  102. 	}
  103. 	return 0;
  104. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp:6:21: fatal error: hacking.h: No such file or directory
compilation terminated.
stdout
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Standard output is empty
https://ideone.com/4yNRzC
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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