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#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include "util.h"
char *rdline(int fd)
{
size_t i = 0, bufsiz = 0, newsz;
char c, *new, *buffer = NULL;
int ret;
for (;;) {
switch (read(fd, &c, 1)) {
case 0:
if (i == 0) {
errno = 0;
return NULL;
}
c = '\0';
break;
case 1:
if (c == '\n')
c = '\0';
break;
default:
if (errno == EINTR)
continue;
goto fail;
}
if (i == bufsiz) {
newsz = bufsiz ? bufsiz * 2 : 16;
new = realloc(buffer, newsz);
if (new == NULL)
goto fail;
buffer = new;
bufsiz = newsz;
}
buffer[i++] = c;
if (c == '\0')
break;
}
return buffer;
fail:
ret = errno;
free(buffer);
errno = ret;
return NULL;
}
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