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[core] fdevent_load_file() shared code

personal/stbuehler/ci-build
Glenn Strauss 1 year ago
parent
commit
cc04468762
  1. 56
      src/fdevent.c
  2. 2
      src/fdevent.h

56
src/fdevent.c

@ -1074,3 +1074,59 @@ int fdevent_set_so_reuseaddr (const int fd, const int opt)
{
return setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
}
#include <sys/stat.h>
#include "safe_memclear.h"
__attribute_cold__ /*(convenience routine for use at config at startup)*/
char *
fdevent_load_file (const char * const fn, off_t *lim, log_error_st *errh, void *(malloc_fn)(size_t), void(free_fn)(void *))
{
int fd = -1;
off_t sz = 0;
char *buf = NULL;
do {
fd = fdevent_open_cloexec(fn, 1, O_RDONLY, 0); /*(1: follows symlinks)*/
if (fd < 0) break;
struct stat st;
if (0 != fstat(fd, &st)) break;
if ((sizeof(off_t) > sizeof(size_t) && st.st_size >= (off_t)~(size_t)0u)
|| (*lim != 0 && st.st_size >= *lim)) {
errno = EOVERFLOW;
break;
}
sz = st.st_size;
buf = malloc_fn((size_t)sz+1);/*+1 trailing '\0' for str funcs on data*/
if (NULL == buf) break;
if (sz) {
ssize_t rd = 0;
off_t off = 0;
do {
rd = read(fd, buf+off, (size_t)(sz-off));
} while (rd > 0 ? (off += rd) != sz : errno == EINTR);
if (off != sz) { /*(file truncated?)*/
if (rd >= 0) errno = EIO;
break;
}
}
buf[sz] = '\0';
*lim = sz;
close(fd);
return buf;
} while (0);
int errnum = errno;
if (errh)
log_perror(errh, __FILE__, __LINE__, "%s() %s", __func__, fn);
if (fd >= 0) close(fd);
if (buf) {
safe_memclear(buf, (size_t)sz);
free_fn(buf);
}
*lim = 0;
errno = errnum;
return NULL;
}

2
src/fdevent.h

@ -112,4 +112,6 @@ int fdevent_set_tcp_nodelay (const int fd, const int opt);
int fdevent_set_so_reuseaddr (const int fd, const int opt);
char * fdevent_load_file (const char * const fn, off_t *lim, log_error_st *errh, void *(malloc_fn)(size_t), void(free_fn)(void *));
#endif

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