Strcpy to copy struct name to char array?

strcpy with char*
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I have a struct which has a name variable, i.e.:

l->name

I also have an array of characters:

char highest1[50];

I want to copy l->name into highest1[50], but I cannot do that.

Am I doing anything illegal here?

strcpy(highest1[50], l->name);

runtime error: index 50 out of bounds for type 'char [50]'

I tried increasing char[50] to char [99] but then I got:

runtime error - illegal array, pointer or other operation

And something about deadly ASAN Signal?


Am I doing anything illegal here:

strcpy(highest1[50], l->name);

Yes code is doing an illegal thing here.

highest1[50] is the value of element 50, some integer value, and that is being treated as an address of where to copy to.

Also with char highest1[50];, attempting to find the value outside the array with highest1[50] is undefined behavior (UB).

To avoid such basic mistakes

1) Enable all complier warnings to save you time. 2) Copy to highest1[] in a way to not overflow its size.

size_t len = strlen(l->name);
if (len >= sizeof highest1) Handle_Error();
else {
  strcpy(highest1, l->name);
}

String Copy - How to play with strings in C, strcpy can be used to copy one string to another. Remember that C strings are character arrays. You must pass character array, or pointer to character array to  Then I want to copy the tkn (char *) returned by strtok() into ntpDate[8]. This method works for getting the date string into ntpDate[10] but for ntpDate I get an empty array or at least an array with a white space character only. I also Serial.println'ed the tkn and it appears to be correct before and after I use strcpy. Relevant code below. Any help is appreciated.


Am I doing anything illegal here:

Yes: two things

  1. Valid indices for highest1 are 0 through 49.
  2. You want strcpy(highest1, l->name) because highest1[0] is a character, not a pointer to one.

The strcpy() Function in C, The strcpy() function is used to copy strings. This function accepts two arguments of type pointer to char or array of characters and returns a pointer to the first  strcpy(highest1[50], l->name); Yes code is doing an illegal thing here. highest1[50] is the value of element 50, some integer value, and that is being treated as an address of where to copy to. Also with char highest1[50];, attempting to find the value outside the array with highest1[50] is undefined behavior (UB).


highest1[50] is the 51 element of highest so you are passing basically a wrong address to strcpy which takes as input two char pointers.

You should call strcpy(highest1, l->name) because the name of the array is the address location of the first element.

Please note also that if you have a string of 4 chars ex. "aaaa" then the array should be of 5 elements to contain the terminating character '\0'.

Why strcpy and strncpy are not safe to use?, src: The string which will be copied. dest: Pointer to the destination array where the Using strcpy() function to copy a large character array into smaller one is  char * strcpy ( char * destination, const char * source ); Copy string Copies the C string pointed by source into the array pointed by destination , including the terminating null character (and stopping at that point).


strcpy in C/C++, Data Structures expand_more strcpy() is a standard library function in C/C++ and is used to copy one string to another. dest: Pointer to the destination array where the content is to be copied. src: This function only works with C style strings and not C++ style strings i.e. it only works with strings of type char str[]; and not  Begin Assign a string value to a char array variable m. Define and string variable str For i = 0 to sizeof(m) Copy character by character from m to str. Print character by character from str. End.


Structures and Arrays, Part I, Structures in C have their own issues when it comes to struct player { char name[32]; int scores[10]; } one; int x; /* assign Because member name is a char array (string), the strcpy() function accesses it directly, one.name . strcpy () is a standard library function in C/C++ and is used to copy one string to another. In C it is present in string.h header file and in C++ it is present in cstring header file. char* strcpy (char* dest, const char* src); Paramters: This method accepts following paramters: dest: Pointer to the destination array where the content is to be


Pointers on Pointers in Structures, #include <stdio.h> #include <string.h> int main() { struct name { char first[24]; char last[24]; }; struct name me; strcpy(me.first,"Dan"); Lines 12 and 13 copy constant strings into the array; both use the . member operator. Well, first, strdup is not part of ISO C. The strcpy function copies a string from its second argument to its first argument. The first argument is a pointer, which must point to a block of memory that has been previously allocated; strcpy does not do any allocation itself.