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#include "getln.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static char *getln_held = NULL;
char *getln(FILE *stream)
{
size_t size;
char *buf;
/* Recover held input from previous run. */
if (getln_held == NULL) {
size = 1024;
buf = malloc(1024);
} else {
size = 1024 + strlen(getln_held);
buf = realloc(getln_held, size);
}
if (buf == NULL) {
perror("getln");
return NULL;
}
memset(buf + size - 1024, 0, 1024);
getln_held = NULL;
/* Read until either end of file or end of line. */
for (;;) {
if (fgets(buf + size - 1024, 1023, stream) == NULL)
break;
if (strchr(buf, '\n') != NULL)
break;
/* Line is longer than 1024 bytes, realloc to make space. */
size += 1024;
char *new_buf = realloc(buf, size);
if (new_buf == NULL) {
perror("getln");
free(buf);
return NULL;
}
buf = new_buf;
memset(buf + size - 1024, 0, 1024);
}
char *endl = strchr(buf, '\n');
if (endl == NULL || endl == buf) {
if (buf[0] == '\0') {
free(buf);
return NULL;
}
return buf;
}
size_t endl_size = strlen(endl + 1);
if (endl_size > 0) {
getln_held = malloc(endl_size + 1);
if (getln_held == NULL) {
perror("getln");
free(buf);
return NULL;
}
strcpy(getln_held, endl);
endl[1] = '\0';
}
return buf;
}
void getln_cleanup(void)
{
if (getln_held != NULL) {
free(getln_held);
getln_held = NULL;
}
}
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