hush/libbb/xreadlink.c
Denis Vlasenko a9b60e93ee new libbb func: xmalloc_realpath (+ use it where makes sense)
syslogd, logread: add debugging code (disabled)
syslogs: drastically smaller bss; fix "-C n" behaviour
2007-01-04 17:59:59 +00:00

49 lines
943 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 *xreadlink(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)
{
#ifdef __GLIBC__
/* 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
}