hush/libbb/xreadlink.c
Denis Vlasenko 6ca0444420 syslogd: fix "readpath bug" by using readlink instead
libbb: rename xgetcwd and xreadlink
2007-02-11 16:19:28 +00:00

49 lines
988 B
C

/* vi: set sw=4 ts=4: */
/*
* xreadlink.c - safe implementation of readlink.
* Returns a NULL on failure...
*/
#include "libbb.h"
/*
* NOTE: This function returns a malloced char* that you will have to free
* yourself. You have been warned.
*/
char *xmalloc_readlink_or_warn(const char *path)
{
enum { GROWBY = 80 }; /* how large we will grow strings by */
char *buf = NULL;
int bufsize = 0, readsize = 0;
do {
buf = xrealloc(buf, bufsize += GROWBY);
readsize = readlink(path, buf, bufsize); /* 1st try */
if (readsize == -1) {
bb_perror_msg("%s", path);
free(buf);
return NULL;
}
}
while (bufsize < readsize + 1);
buf[readsize] = '\0';
return buf;
}
char *xmalloc_realpath(const char *path)
{
#if defined(__GLIBC__) && !defined(__UCLIBC__)
/* glibc provides a non-standard extension */
return realpath(path, NULL);
#else
char buf[PATH_MAX+1];
/* on error returns NULL (xstrdup(NULL) ==NULL) */
return xstrdup(realpath(path, buf));
#endif
}