diff options
Diffstat (limited to 'usr/src/lib/libast/common/path/pathaccess.c')
| -rw-r--r-- | usr/src/lib/libast/common/path/pathaccess.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/usr/src/lib/libast/common/path/pathaccess.c b/usr/src/lib/libast/common/path/pathaccess.c new file mode 100644 index 0000000000..8d84e2aa2c --- /dev/null +++ b/usr/src/lib/libast/common/path/pathaccess.c @@ -0,0 +1,57 @@ +/*********************************************************************** +* * +* This software is part of the ast package * +* Copyright (c) 1985-2007 AT&T Knowledge Ventures * +* and is licensed under the * +* Common Public License, Version 1.0 * +* by AT&T Knowledge Ventures * +* * +* A copy of the License is available at * +* http://www.opensource.org/licenses/cpl1.0.txt * +* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * +* * +* Information and Software Systems Research * +* AT&T Research * +* Florham Park NJ * +* * +* Glenn Fowler <gsf@research.att.com> * +* David Korn <dgk@research.att.com> * +* Phong Vo <kpv@research.att.com> * +* * +***********************************************************************/ +#pragma prototyped +/* + * Glenn Fowler + * AT&T Bell Laboratories + * + * return path to file a/b with access mode using : separated dirs + * both a and b may be 0 + * if a==".." then relative paths in dirs are ignored + * if (mode&PATH_REGULAR) then path must not be a directory + * if (mode&PATH_ABSOLUTE) then path must be rooted + * path returned in path buffer + */ + +#include <ast.h> + +char* +pathaccess(register char* path, register const char* dirs, const char* a, const char* b, register int mode) +{ + int sib = a && a[0] == '.' && a[1] == '.' && a[2] == 0; + int sep = ':'; + char cwd[PATH_MAX]; + + do + { + dirs = pathcat(path, dirs, sep, a, b); + pathcanon(path, 0); + if ((!sib || *path == '/') && pathexists(path, mode)) + { + if (*path == '/' || !(mode & PATH_ABSOLUTE)) + return path; + dirs = getcwd(cwd, sizeof(cwd)); + sep = 0; + } + } while (dirs); + return 0; +} |