/* runcap - run program and capture its output
Copyright (C) 2017 Sergey Poznyakoff
Runcap is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
Runcap is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with Runcap. If not, see . */
#include
#include
#include
#include "runcap.h"
ssize_t
runcap_getline(struct runcap *rc, int sd, char **pstr, size_t *psize)
{
char *str;
size_t size;
size_t n;
char c;
int res;
if (!pstr || !psize) {
errno = EINVAL;
return -1;
}
str = *pstr;
size = *psize;
if (!str || size == 0) {
/* Initial allocation */
size = 16;
str = malloc(size);
if (!str)
return -1;
*pstr = str;
*psize = size;
}
n = 0;
while ((res = runcap_getc(rc, sd, &c)) == 1) {
if (n == size) {
char *p;
size_t sz;
if (size >= (size_t) -1 / 3 * 2) {
errno = ENOMEM;
return -1;
}
sz = size + (size + 1) / 2;
p = realloc(str, sz);
if (!p)
return -1;
*pstr = str = p;
*psize = size = sz;
}
str[n++] = c;
if (c == '\n')
break;
}
if (res == -1)
return -1;
if (n == size) {
char *p = realloc(str, size + 1);
if (!p)
return -1;
*pstr = str = p;
*psize = ++size;
}
str[n] = 0;
return n;
}