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getline.c
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getline.c
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#include <stdio.h>
#include <stdlib.h>
#define BUFFER_SIZE 1024
/**
* my_getline - reads a line from the given input stream
* @lineptr: pointer to pointer to a character array that stores the input line
* @n: pointer to a size_t variable that holds the size of the character array
* @stream: a pointer to stdin
*
* Return: number of characters read, including the terminating null byte
*/
ssize_t my_getline(char **lineptr, size_t *n, FILE *stream)
{
static char buffer[BUFFER_SIZE];
static size_t buffer_pos;
size_t line_pos = 0;
char c;
buffer_pos = 0;
if (*lineptr == NULL)
*lineptr = malloc(*n);
if (*lineptr == NULL)
return (-1);
while (1)
{
if (buffer_pos == 0)
{
size_t bytes_read = fread(buffer, 1, BUFFER_SIZE, stream);
if (bytes_read == 0)
return (-1);
}
c = buffer[buffer_pos++];
if (c == '\n' || buffer_pos == BUFFER_SIZE)
{
(*lineptr)[line_pos++] = '\0';
*n = line_pos;
buffer_pos = 0;
return (line_pos);
}
(*lineptr)[line_pos++] = c;
if (line_pos >= *n)
{
*n += BUFFER_SIZE;
*lineptr = realloc(*lineptr, *n);
if (*lineptr == NULL)
return (-1);
}
}
}