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realloc.c
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realloc.c
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#include "shell.h"
/**
* _memset - fills memory with a constant byte
* @s: the pointer to the memory area
* @b: the byte to fill *s with
* @n: the amount of bytes to be filled
* Return: (s) a pointer to the memory area s
*/
char *_memset(char *s, char b, unsigned int n)
{
for (unsigned int i = 0; i < n; i++) {
s[i] = b;
}
return s;
}
/**
* ffree - frees a string of strings
* @pp: string of strings
*/
void ffree(char **pp)
{
if (!pp) {
return;
}
while (*pp) {
free(*pp++);
}
free(pp); // removed unnecessary assignment to 'a'
}
/**
* _realloc - reallocates a block of memory
* @ptr: pointer to previous malloc'ated block
* @old_size: byte size of previous block
* @new_size: byte size of new block
*
* Return: pointer to the reallocated block
*/
void *_realloc(void *ptr, unsigned int old_size, unsigned int new_size)
{
if (!ptr) {
return malloc(new_size);
}
if (!new_size) {
free(ptr);
return NULL;
}
if (new_size == old_size) {
return ptr;
}
void *p = malloc(new_size);
if (!p) {
return NULL;
}
unsigned int copy_size = old_size < new_size ? old_size : new_size;
for (unsigned int i = 0; i < copy_size; i++) {
((char *)p)[i] = ((char *)ptr)[i];
}
free(ptr);
return p;
}