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#include "drain.h"
#include <stdlib.h>
#include <string.h>
char *drain(FILE *fp)
{
size_t size = 1025;
char *buf = calloc(1025, 1);
if (buf == NULL) {
perror("drain");
return NULL;
}
/* Read until end of file. */
for (;;) {
if (fread(buf + size - 1025, 1024, 1, fp) != 1)
return buf;
/* Line is longer than 1024 bytes, realloc to make space. */
size += 1024;
char *new_buf = realloc(buf, size);
if (new_buf == NULL) {
perror("drain");
free(buf);
return NULL;
}
buf = new_buf;
memset(buf + size - 1024, 0, 1024);
}
}
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