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#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
extern int getline(char **line, size_t *len, FILE *file);
int getline(char **line, size_t *len, FILE *file)
{
char *ptr, *end;
int c;
if (*line == NULL) {
errno = EINVAL;
if (*len == 0)
*line = malloc(4096);
if (*line == NULL)
return -1;
*len = 4096;
}
ptr = *line;
end = *line + *len;
while ((c = fgetc(file)) != EOF) {
if (ptr + 1 >= end) {
char *newline;
int offset;
newline = realloc(*line, *len + 4096);
if (newline == NULL)
return -1;
offset = ptr - *line;
*line = newline;
*len += 4096;
ptr = *line + offset;
end = *line + *len;
}
*ptr++ = c;
if (c == '\n') {
*ptr = '\0';
return ptr - *line;
}
}
*ptr = '\0';
return -1;
}
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