CODEWITHSUNDEEP
carraysrealloc
Hanna Gabby
Hanna Gabby

Reputation: 57

realloc an array of string

Currently, I have some confusion in realloc an array string. If I have this:

char** str = (char**)malloc(100*sizeof(char*));
str[0] = (char*)malloc(sizeof(char)*7); //allocate a space for string size 7
//some other code that make the array full

My question is, if I want to realloc str[0] to size 8, do I need to realloc both str and str[0] like this:

str = (char**)realloc(str,sizeof(char*)*101);
str[0] = (char*)realloc(str[0],sizeof(char)*8);

Is this correct?

Upvotes: 2

Views: 6081

Answers (2)

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726509

No, you do not need to reallocate the array of strings to lengthen the string at index zero. All you need is

str[0] = (char*)realloc(str[0],sizeof(char)*8);

Upvotes: 3

nneonneo
nneonneo

Reputation: 179392

You realloc the master array when you want to add a string (changing the number of strings). You realloc an individual string when you want to change that string's length.

Therefore, only realloc str[0] if you want to change the string's buffer size.

Upvotes: 3

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