Thursday, 28 December 2006
|
| Need to find size of destination buffer for strncpy Mohansnayaka 23:40:44 |
| | Hi all,
We are using strcpy to copy strings in our app. This gave us problems
when the destination buffer is not large enough. As a workaround, we
wanted to replace calls to strcpy with strncpy. That is, replace calls
to strcpy with say, my_strcpy(dest,src) which will internally find the
destination buffer length.
For this we need to know the destination buffer size. For statically
allocated strings sizeof is returning the length of the array
correctly, but not for malloced strings (char*). Hence we are not able
to replace calls to strcpy with strncpy with appropriate length
parameter.
Is there any other way out? Changing all the static and dynamic
allocations in the application is very very difficult (around 15k
instances will have to be changed).
Regards,
Mohan
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| |  3 answer | Add comment |
|
| Kaum hatte ich eine, hat sich Thomas ebenfalls eine bestellt Luca Sabina Matoussek 23:16:34 |
| | Wie geht's dir Tim,
Kaum hatte ich eine, hat sich Thomas ebenfalls eine bestellt
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Kohncke ab Paula ab Coroner Tim Basisspannung und,
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Tim von Aufsatz sauber Er muss bald hier sein. fÝr gÝltig erklÄren
artgerecht mir Entwickler.
|
| | Add comment |
|
| Read/Write link list on file Sharique.Khan 21:31:56 |
| | Hey I'm a new member of this group. And I have a problem and I was
try to find many solution on internet but I couuld't find any
solution. So I join this group in this hope that peoples of this
group helps me. And then I will find the solution of my problem. My
problem is I want to save the records(in the form of link list) in a
file and then read it from the file. But I couuld'nt. Here is a code
/* To save structure on file */
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <library.h>
#define TRUE 1
void book_menu(void);
void menu(void);
void book_entry(void);
void show_all_books(void);
void save(void);
void file_read(void);
books *ptr_books_first, *ptr_books_this, *ptr_books_new;
void main(void){
clrscr();
ptr_books_first = (struct books *) NULL;
char ch;
while(TRUE){
menu();
ch = getch();
switch(ch){
case '1':
clrscr();
book_menu();
break;
case 'q': case 'Q':
exit(0);
break;
default:
printf("\nPlease select from list.\n");
}
}
}
void menu(void){
printf("\n1. Books Information");
printf("\n4. Quit.\n");
}
void book_menu(){
char book_choice;
printf("1. Books Entry\n");
printf("2. show all Books\n");
printf("4. save\n");
printf("5. read\n");
book_choice = getch();
switch(book_choice){
case '1':
book_entry();
break;
case '2':
show_all_books();
break;
case '4':
save();
break;
case '5':
file_read();
break;
}
}
void book_entry(void){
ptr_books_new = (struct books *) malloc(sizeof(struct
books));
if(ptr_books_first == (struct books *) NULL)
ptr_books_first = ptr_books_this = ptr_books_new;
else{
ptr_books_this = ptr_books_first;
while(ptr_books_this->ptr_books_next != (struct books *)
NULL)
ptr_books_this = ptr_books_this->ptr_books_next;
ptr_books_this->ptr_books_next = ptr_books_new;
ptr_books_this = ptr_books_new;
}
char numstr[81];
printf("Enter ISBN no.: ");
gets(ptr_books_this->isbn_num);
printf("Enter Book name: ");
gets(ptr_books_this->book_title);
printf("Enter Author name: ");
gets(ptr_books_this->book_author);
printf("Enter Book category: ");
gets(ptr_books_this->book_category);
printf("Enter Date induct: ");
gets(ptr_books_this->date_induct);
printf("Enter Book Serial number: ");
gets(numstr);
ptr_books_this->book_snum = atoi(numstr);
printf("Edition: ");
gets(numstr);
ptr_books_this->edition = atoi(numstr);
printf("Enter Shelf no.: ");
gets(numstr);
ptr_books_this->shelf_num = atoi(numstr);
printf("Enter Shelf row no.: ");
gets(numstr);
ptr_books_this->shelf_row_num = atoi(numstr);
ptr_books_this->ptr_books_next = (struct books *) NULL;
}
void show_all_books(){
if(ptr_books_first == (struct books *) NULL)
printf("\nEmpty list.\n");
ptr_books_this = ptr_books_first;
while(ptr_books_this != (struct books *)NULL){
printf("\nbook ISBN no.: %s\n",ptr_books_this- >isbn_num);
printf("book name: %s\n",ptr_books_this->book_title);
printf("book author: %s\n",ptr_books_this->book_author);
printf("book category: %s\n",ptr_books_this- >book_category );
printf("Enter book date induct: %s\n",ptr_books_this- >date_induct);
printf("Enter book serial number: %d\n",ptr_books_this- >book_snum);
printf("Book edition: %d\n",ptr_books_this->edition);
printf("shelf no.: %d\n",ptr_books_this->shelf_num);
printf("Enter shelf row no.: %d\n", ptr_books_this- >shelf_row_num);
ptr_books_this = ptr_books_this->ptr_books_next;
}
}
void save(){
FILE *fptr;
if(ptr_books_first == (struct books *) NULL)
printf("\nEmpty list.\n");
ptr_books_this = ptr_books_first;
if( (fptr=fopen("D:/Tc/pro/Data.txt", "a+")) == NULL )
printf("\nCan't open file Data.txt");
else{
while(ptr_books_this != (struct books *)NULL){
fwrite(ptr_books_this, sizeof(books), 1, fptr);
ptr_books_this = ptr_books_this->ptr_books_next;
}
printf("Record are written\n");
fclose(fptr);
}
}
void file_read(){
FILE *fptr;
if(ptr_books_first == (struct books *) NULL)
printf("\nEmpty list.\n");
ptr_books_this = ptr_books_first;
if( (fptr=fopen("D:/Tc/pro/Data.txt", "r+")) == NULL )
printf("\nCan't open file Data.txt");
else{
while ( fread(ptr_books_this, sizeof(books), 1, fptr) ==
1){
printf("\nISBN no.: %s\n",ptr_books_this- >isbn_num);
printf("Book Name: %s\n", ptr_books_this- >book_title);
printf("Author: %s\n",ptr_books_this- >book_author);
printf("Book category: %s\n",ptr_books_this- >book_category);
printf("Date induct: %s\n",ptr_books_this- >date_induct);
printf("Serial number: %03d\n",ptr_books_this- >book_snum);
printf("Edition: %03d\n",ptr_books_this- >edition);
printf("Shelf no.: %03d\n",ptr_books_this- >shelf_num);
printf("Shelf row no.: %03d\n",ptr_books_this- >shelf_row_num);
ptr_books_this = ptr_books_this- >ptr_books_next;
}
printf("Record are read\n");
fclose(fptr);
}
}
I hope anyone help me in this problem. So thanks in advance
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| | 1 answer | Add comment |
|
| Separate yourself from other men Joaquin Wright 16:38:23 |
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|
| Creating Libraries Srikanth M R 16:11:01 |
| | Hello everyone.
My question is pretty straightforward. How do I
create a library(i.e a header file) in C/C++?
Thanq
Bye
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| | 7 answers | Add comment |
|
| Plese answer this program Ambika Balasubramaniyan 15:55:38 |
| | Hi all,
This is a 'C' program, It has devided in to 3 parts. can anyone give
me the correct answer for this program.
We can cobine all the 3 parts and we can rearrange the lines.
Expected answer is in the last line of the page;
moveit(buf[--i], Y << 4 & Y >> 4);
moveit(buf[--i], Y << 4 & Y >> 4);
int j;
for (j=0; j<16; j++) { if (x%2) *(s+15-j)='*'; x=x>>1; }
strcpy(s," ");
moveit(buf[--i], Y & 0x3c0);
}
moveit(buf[--i], Y & 0x3c0);
int i=0;
int zeta = 0; static int ctr = 0;
}
char **buf = malloc(8*sizeof(char*));
int i=0;
moveit(buf[--i], 0x180);
print(buf);
*ptr++ = 0x47; *ptr++ = 0x45;
sprintf(ptr, "%04x", zeta & Y);
char *ptr = malloc(10*sizeof(char));
moveit(buf[--i], Y << 5 & Y >> 5);
#include <stdio.h>
void print(char **mem) {
zeta += (x << ctr++);
moveit(buf[--i], 0x1ff8);
const int Y = 65535;
*ptr++ = 0x4d; *ptr++ = 0x3d;
char *p1 = ptr;
}
main() {
for (i=0; i<8; i++) { buf[i] = (char *) malloc(17*sizeof(char));}
for (i=0; i<8; i++) { printf("%s\n",mem[i] ); }
strcpy(buf[--i], p1);
void moveit(char *s, int x) {
Output
--------
GEM=nnn
****
********
**********
********
******
****
**
Instead of "nnn", there will be code consisting of digits and
alphabets. Find that code.
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| | 1 answer | Add comment |
|
| Heap usage tracker Subhabrata Bhattacharya 15:43:53 |
| | Hi,
I am writing a few lines of C code to find how much heap memory is
being used in a particular program. At the end of program exit, it
would print something like:
Count Size Location
===== ===== =========
1 32 0x00221a32
2 12 0x0804853e
3 07 0x011435a3
...
I am in a position to trap every malloc() call and obtain the size and
location trivially. The table will grow, so the size needs to be
modified dynamically. What is a space efficient data-structure for the
above?
typedef struct{
int *t_loc; /*Store the location*/
int *t_siz; /*Store the size*/
} HEAP_USAGE;
HEAP_USAGE hu;
...
hu.t_loc = (int *)malloc (sizeof (int));
...
hu.t_loc = (int *)realloc (hu.t_loc,sizeof (int));
...
OR
typedef struct{
int t_loc; /*Store the location*/
int t_siz; /*Store the size*/
} HEAP_USAGE;
HEAP_USAGE *hu;
...
hu = (int *)malloc (sizeof (HEAP_USAGE));
...
hu = (int *)realloc (hu, sizeof (HEAP_USAGE));
...
Please suggest.
Regards,
Subh
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