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31 gru 2009 · m->data = realloc(m->data, m->max * sizeof(void*)); is bad. If realloc fails, it returns null pointer, but it doesn't deallocate the old memory. The above code will null your m->data while the old memory block formerly pointed by m->data will most likely become memory leak (if you have no other references to it).
From man realloc:The realloc() function returns a pointer to the newly allocated memory, which is suitably aligned for any kind of variable and may be different from ptr, or NULL if the request fails.
21 maj 2023 · void*realloc(void*ptr, size_t new_size ); Reallocates the given area of memory. If ptr is not NULL, it must be previously allocated by malloc, calloc or realloc and not yet freed with a call to free or realloc. Otherwise, the results are undefined. The reallocation is done by either:
28 maj 2017 · Size of dynamically allocated memory can be changed by using realloc (). As per the C99 standard: void *realloc(void *ptr, size_t size); realloc deallocates the old object pointed to by ptr and returns a pointer to a new object that has the size specified by size.
Return value: realloc() returns a pointer to the new space, or NULL if the request cannot be satisfied. Example for realloc:
The realloc function allocates a block of memory (which be can make it larger or smaller in size than the original) and copies the contents of the old block to the new block of memory, if necessary. Syntax. The syntax for the realloc function in the C Language is: void *realloc(void *ptr, size_t size); Parameters or Arguments ptr The old block ...
Here you can get all the exercise code of c programming course on Hablu Programmer. - harun181/c_programming
