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realpath,readlink -f: coreutils compat, closes 11021

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function                                             old     new   delta
xmalloc_realpath_coreutils                             -     121    +121

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-05-24 17:29:14 +02:00
parent 3f91e662f2
commit 747162109f
4 changed files with 33 additions and 2 deletions
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2
coreutils/readlink.c
View File

@ -86,7 +86,7 @@ int readlink_main(int argc UNUSED_PARAM, char **argv)
/* NOFORK: only one alloc is allowed; must free */
if (opt & 1) { /* -f */
buf = xmalloc_realpath(fname);
buf = xmalloc_realpath_coreutils(fname);
} else {
buf = xmalloc_readlink_or_warn(fname);
}

2
coreutils/realpath.c
View File

@ -38,7 +38,7 @@ int realpath_main(int argc UNUSED_PARAM, char **argv)
do {
/* NOFORK: only one alloc is allowed; must free */
char *resolved_path = xmalloc_realpath(*argv);
char *resolved_path = xmalloc_realpath_coreutils(*argv);
if (resolved_path != NULL) {
puts(resolved_path);
free(resolved_path);

1
include/libbb.h
View File

@ -485,6 +485,7 @@ DIR *xopendir(const char *path) FAST_FUNC;
DIR *warn_opendir(const char *path) FAST_FUNC;
char *xmalloc_realpath(const char *path) FAST_FUNC RETURNS_MALLOC;
char *xmalloc_realpath_coreutils(const char *path) FAST_FUNC RETURNS_MALLOC;
char *xmalloc_readlink(const char *path) FAST_FUNC RETURNS_MALLOC;
char *xmalloc_readlink_or_warn(const char *path) FAST_FUNC RETURNS_MALLOC;
/* !RETURNS_MALLOC: it's a realloc-like function */

30
libbb/xreadlink.c
View File

@ -122,3 +122,33 @@ char* FAST_FUNC xmalloc_realpath(const char *path)
return xstrdup(realpath(path, buf));
#endif
}
char* FAST_FUNC xmalloc_realpath_coreutils(const char *path)
{
char *buf;
errno = 0;
buf = xmalloc_realpath(path);
/*
* There is one case when "readlink -f" and
* "realpath" from coreutils succeed,
* even though file does not exist, such as:
* /tmp/file_does_not_exist
* (the directory must exist).
*/
if (!buf && errno == ENOENT) {
char *last_slash = strrchr(path, '/');
if (last_slash) {
*last_slash++ = '\0';
buf = xmalloc_realpath(path);
if (buf) {
unsigned len = strlen(buf);
buf = xrealloc(buf, len + strlen(last_slash) + 2);
buf[len++] = '/';
strcpy(buf + len, last_slash);
}
}
}
return buf;
}