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4 yr. ago
Readline from stdin
If one has POSIX extensions available, then it seems that defining _POSIX_C_SOURCE and just using getline or detdelim is the way to go. However, for source that is just C, here is a solution I've found from various sources, mainly here. I've also tried to make it more safe.
undefined
// Read line from stdin
#include <stdio.h>
#include <stdlib.h>
#define CHUNK_SIZE 16 // Allocate memory in chunks of this size
// Safe self-realloc
void *xrealloc(void *ptr, size_t size)
{
void *tmp = realloc(ptr, size);
if (!tmp) free(ptr);
return tmp;
}
// Dynamically allocate memory for char pointer from stdin
char *readline(void)
{
size_t len = 0, chunk = CHUNK_SIZE;
char *str = (char *)malloc(CHUNK_SIZE);
if (!str) return NULL;
int ch;
while((ch = getchar()) != EOF && ch != '\n' && ch != '\r') {
str[len++] = ch;
if (len == chunk) {
str = (char *)xre